JP2013022303A - Vacuum cleaner and suction nozzle thereof - Google Patents

Abstract

【Task】
There is a phenomenon in which the magnetic flux generated by the magnet is weakened by the magnetic flux generated by the coil, and there is a problem that the efficiency of the motor is lowered, and the torque cannot be improved efficiently. Provided is a vacuum cleaner including a suction tool capable of achieving both weight reduction and torque improvement without reducing the efficiency of an electric motor.
[Solution]
In order to suppress weakening of the magnetic flux by the magnet by weakening the magnetic flux generated by the coil by providing a long hole that matches the direction of the electric motor shaft in the housing of the magnet arrangement portion installed on the inner surface of the motor housing did.
[Selection] Figure 1

Description

  The present invention relates to a vacuum cleaner, and more particularly to a vacuum cleaner provided with a suction tool having a rotary cleaning body driven by an electric motor called a power brush, and the suction tool.

  A vacuum cleaner is generally composed of a vacuum cleaner body equipped with a dust collector and an electric blower, a suction tool for sucking dust on the cleaning surface, and an extension pipe and suction hose connecting between them. It has a structure called. The main body of the vacuum cleaner includes a storage housing for storing the dust collector and the electric blower described above, and the side and bottom of the storage housing can be freely moved on the cleaning surface via wheels. Has been.

  The suction tool for floors in such an electric vacuum cleaner is provided with the rotary cleaning body which consists of a brush etc., and the electric motor for driving this rotary cleaning body is provided in the suction tool.

  By the way, in this kind of electric motor, as described in Japanese Patent Application Laid-Open No. 2007-189874 (Patent Document 1), the cross section is formed in a substantially oval shape, and has a pair of opposed curved surface portion and flat surface portion. A configuration is adopted in which a magnet is fixed inside the curved surface portion of the housing and a rotor is rotatably arranged inside the magnet.

  Further, as described in Japanese Patent Application Laid-Open No. 2009-278844 (Patent Document 2), a large hole larger than the axial length of the rotor is formed in the flat portion of the housing, and a thin magnet is used to increase the size of the rotor. There are proposals for increasing the torque by increasing the diameter.

JP 2007-189874 A JP 2009-278844 A

  However, in order to increase the torque in the conventional electric motor described above, the rotor must have a large diameter, which causes a problem that the whole electric motor is enlarged, the weight of the suction tool is increased, and the operability is deteriorated.

  Further, when the electric motor is not increased in size, it is necessary to open a long hole in the flat portion of the housing in order to avoid interference between the rotor having a larger diameter and the housing. However, if a long hole is made in the flat portion of the housing, the magnetic circuit of the magnet will be broken by the long hole, so that there is a problem that the efficiency of the motor is reduced and the torque cannot be increased efficiently. There was a problem.

  The objective of this invention is providing the vacuum cleaner provided with the suction tool which can make weight reduction and torque improvement compatible, without reducing the efficiency of an electric motor.

  A feature of the present invention is that the magnetic flux generated by the coil is weakened by weakening the magnetic flux generated by the coil by providing a long hole that matches the direction of the motor shaft in the housing of the magnet arrangement portion installed on the inner surface of the housing of the electric motor. I tried to suppress it.

  According to the present invention, a long hole is provided in the axial direction of the motor in the housing portion where the magnet is arranged, so that the magnetic circuit of the magnetic flux generated when a current is supplied to the coil is partially cut off to generate the coil. It is possible to prevent the magnetic flux based on the magnet from being weakened and thereby the magnetic flux based on the magnet from being weakened.

It is an expansion perspective view which shows the electric motor for driving a rotary cleaning body. It is an external appearance perspective view which shows the whole structure of a vacuum cleaner. (A) is a top view which shows a suction tool, (b) is a front view similarly. (A) is a side view of a suction tool, (b) is sectional drawing which follows the AA line of Fig.3 (a). It is a bottom view of a suction tool. (A) is sectional drawing which follows the BB line of Fig.3 (a), (b) is sectional drawing which follows CC line of Fig.3 (a). It is a top view which shows the internal structure of the suction tool of the state which removed the upper case. It is a disassembled perspective view of a suction tool (a joint part is excluded). (A) is the enlarged view of the P section of Fig.3 (a), (b) is the enlarged view of the Q section similarly. It is a figure which shows an electric motor, (a) is a front view, (b) is a left view, (c) is a right view. It is the external appearance perspective view which looked at the suction tool from back. (A) is an enlarged sectional view taken along line XX in FIG. 10 (a), (b) is an enlarged sectional view taken along line YY in FIG. 10 (a), and (c) is shown in FIG. 10 (c). It is sectional drawing which follows a ZZ line. It is a characteristic view which shows the relationship between the width | variety (short direction) of the groove | channel added to the housing, and generated torque. (A) is sectional drawing which follows the WW line of Fig.10 (a), (b) is a bottom view of an electric motor. (A) is a schematic explanatory drawing, (c) is a schematic explanatory drawing of a comparative example. It is explanatory drawing of the effect of the long hole opened in the housing. It is explanatory drawing of a motor cooling air.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the suction tool, the side on which the rotary cleaning body 110 (see FIG. 3A) is disposed is the front side, and the suction joint 10B (FIG. 3). The side to which (a) is connected will be described as the rear side.

  As shown in FIG. 2, the vacuum cleaner 1 is connected to the cleaner body 2, the hose 3 connected to the cleaner body 2, the hand operation unit 4 connected to the hose 3, and the hand operation unit 4. The extension tube 5 and a suction tool 10 attached to the extension tube 5 are provided.

  The vacuum cleaner main body 2 includes a suction electric blower that generates a suction force (not shown) and a dust collection unit that stores dust collected by the suction force of the suction electric blower. The operation of the suction electric blower is controlled by operating the operation switch SW provided on the handle portion of the unit 4.

  One end of the hose 3 is connected to the connection port 2 a of the cleaner body 2 so as to communicate with the dust collecting part of the cleaner body 2, and the other end of the hose 3 is connected to the hand operation unit 4. The extension pipe 5 is composed of two pipe bodies 5 a and 5 b and can be expanded and contracted, and one end of the pipe body 5 a is connected to the other end of the hand operation section 4.

  As shown in FIG. 3B, the suction tool 10 has a suction port 100 opened in a lower surface (cleaning surface), and a rotary cleaning body 110 is disposed in the suction port 100. The rotary cleaning body 110 is rotationally driven by an electric motor 120 described later as a driving means.

  As shown in FIG. 2, the suction tool 10 is attached to the rear side of the suction tool body 10 </ b> A, and a suction tool body 10 </ b> A including a lower case 11 that forms a lower portion, and an upper case 12 that is attached to the upper portion of the lower case 11. And a suction fitting joint 10B in which an air passage R1 (see FIG. 4) is formed. The main parts of the lower case 11, the upper case 12, and the suction tool joint 10B are formed of a light and hard material, for example, a synthetic resin material such as ABS resin.

  Here, as shown in FIG. 3A, the suction tool joint 10B is provided with a rotation shaft 7 at the other end (the suction body 10A side). 7 is sandwiched between and supported by the lower case 11 and the upper case 12, and is provided so as to be rotatable in the vertical direction with respect to the suction tool main body 10A. Moreover, the suction tool 10 is provided so that rotation in the left-right direction centering on the rotation part 7b is possible.

  Furthermore, the suction tool joint 10B is provided with a contact pin (not shown) on the rear side, and electric power is supplied to the motor 120 of the suction tool 10 via this contact pin.

  Further, a bumper 8 is interposed between the lower case 11 and the upper case 12 from the front part to the left and right sides of the suction tool main body 10A. The bumper 8 is made of an elastic material such as rubber or synthetic rubber. When the vacuum cleaner 1 is used, the bumper 8 maintains airtightness in the suction tool main body 10A when the bumper 8 collides with furniture or the like. The furniture and the like are damaged, and the impact to the suction tool main body 10A is absorbed.

  The suction port 100 opened on the lower surface of the lower case 11 has a substantially curved concave shape in cross section, and a suction passage 101 is formed in the rear of the suction port 100 as shown in FIG. The suction passage 101 communicates with the passage R1 (see FIG. 4B) of the suction fitting joint 10B. Reference numerals 11b and 11c denote brush covers, and a brush drive switch 11a and wheels 11d are attached to the case 11 as shown in FIG. A rotating cleaning body 110 is arranged in the front suction port 100 of the lower case 11. In FIG. 5, reference numeral 113 is a roller member, and 113 ′ is an outer peripheral side end portion of the roller member.

  Further, as shown in FIG. 6A, a motor housing chamber 13 is formed between the lower case 11 and the upper case 12 with a partition wall 13e therebetween, and the motor 120 is housed in the motor housing chamber 13. ing.

  6A and 6B, reference numeral 110 denotes a rotary cleaning body, and this rotary cleaning body 110 is pivotally supported on a shaft portion 110a of the rotary cleaning body. Eleven points are a cylindrical base | substrate, This comprises the rotary cleaning body 110, and the cleaning members 112a, 112b, and 112c are attached to this. 112a and 112b are outer peripheries of the cleaning member 112a.

  Reference numeral 13 denotes an electric motor accommodation chamber in which the electric motor 120 is accommodated. The electric motor 120 is supported by electric motor support portions 13a, 13b, 13c, and 13d. Reference numeral 125 is a cover member of the electric motor.

  A large-diameter toothed pulley 130 is attached to one end of the rotary cleaning body 110, and a small-diameter toothed pulley 131 is attached to the rotating shaft of the electric motor 120, and both are linked by a toothed belt 132. . Therefore, the rotation of the electric motor is transmitted to the rotary cleaning body 110. The tension of the toothed belt 132 is adjusted by a tensioner 133. Reference numeral 124a is a rotating shaft of the electric motor.

  As shown in FIG. 7, the motor housing chamber 13 communicates with a later-described passage R3 provided in front of the motor housing chamber 13 through an opening 13e 'provided in the partition wall 13e.

  Further, the motor housing chamber 13 communicates with the end opening 7a of the rotating shaft 7 of the suction joint 10B through a passage R4 formed on the center side of the lower case 11. The rotation shaft 7 communicates with a passage R1 provided in the suction tool main body 10A.

  As shown in FIG. 7, the motor housing chamber 13 is provided with a partition portion 13 f. With the DC motor (hereinafter simply referred to as “motor”) 120 housed in the motor housing chamber 13, the partition portion 13 f The electric motor storage chamber 13 is divided into left and right. In other words, the opening 122b is located in the right chamber in the figure and the opening 122c is located in the left chamber in the figure across the partition portion 13f, and the left and right sides through the motor 120 (in the housing 122). The rooms are in communication.

  As shown in FIG. 5, a brush drive switch 11a, brush covers 11b and 11c, and wheels 11d are provided on the lower surface of the lower case 11.

  The brush drive switch 11a is a switch that detects whether or not the lower surface of the suction tool 10 is in contact with the cleaning surface. The brush drive switch 11a includes wheels, and is provided so that the wheels always protrude from the lower surface of the lower case 11 by biasing means such as a spring.

  When it is detected that the wheel has popped out and is not in contact with the cleaning surface, the electric motor 120 is stopped by the control board 10C (see FIG. 7) provided in the suction tool 10. Further, when it is detected that the wheel is pushed into contact with the cleaning surface, the electric motor 120 is driven by the control board 10C (see FIG. 7).

  Further, the brush covers 11 b and 11 c can be detached from the lower case 11, and the rotary cleaning body 110 can be detached by removing these from the lower case 11.

  The wheel 11d receives the stress of the forward / backward movement or the rotation operation operated by the hand operation unit 4 and brings the bottom surface of the suction tool 10 into close contact with the cleaning surface, thereby improving the operation performance of the suction tool 10. is there. Further, as shown in FIG. 6A, a passage S <b> 1 through which cooling air to be described later for cooling the electric motor 120 flows is formed between the lower case 11 and the upper case 12.

  As shown in FIG. 6A, the rotary cleaning body 110 disposed in the suction port 100 includes a cylindrical base 111 and fibers fixed so as to protrude in the radial direction from the outer peripheral surface of the cylindrical base 111. The brush-like cleaning members 112a to 112c are fixed and configured so as to protrude in the radial direction. The cleaning members 112a to 112c are respectively provided in a spiral shape along the axial direction of the rotary cleaning body 110. The cleaning members 112a to 112c enable contact with the cleaning surface and act to scrape dust on the cleaning surface by the rotational driving force.

  When the cleaning surface is flooring or the like, the frictional resistance against the rotary cleaning body 110 is small, so the load on the motor 120 is small. However, when the cleaning surface is a carpet or the like, the frictional resistance against the rotary cleaning body 110 is large, The load applied to 120 increases. Therefore, the motor 120 needs to have enough torque to rotate even when the rotary cleaning body 110 comes into contact with the carpet or the like.

  Here, the length and number of the cleaning members 112a to 112c, their cross-sectional shapes, and the like can be set as appropriate, and some of the cleaning members may be blades made of a soft material such as rubber.

  In this embodiment, as shown in FIG. 5 and FIG. 6A, the outer peripheral side end portions 112 a ′ and 112 b ′ of the cleaning members 112 a and 112 b with long bristle are surfaces provided at both end portions of the rotary cleaning body 110. Is set to be longer than the outer peripheral side end 113 ′ of the cylindrical roller member 113 (see FIG. 3) made of a soft material such as a brush.

  Accordingly, a sufficient wrap amount between the cleaning surface and the cleaning members 112a to 112c is ensured to have a dust scraping force and a wiping function, and when the suction tool 10 is placed on the cleaning surface, the cleaning member bends and the rollers The member 113 comes into contact with the cleaning surface, and the suction tool 10 generates a force that advances by itself. Therefore, the suction tool can be operated with a light force.

  In addition, an air inlet (not shown) that is bent and opened by the magnitude of the negative pressure in the air inlet 100 is formed on the upper side of the rotary cleaning body 110, and dust floating in the upper space of the upper case 12 is collected in the air inlet 100. You may comprise so that it may take in.

  The rotary cleaning body 110 has shafts (not shown) extending to both ends in the axial direction, and these shafts are supported by bearings (not shown) provided at both inner ends of the suction port 100, so that the suction port It is rotatably provided in 100. Note that a large-diameter pulley 130 (see FIG. 6B) that receives a rotational driving force from the electric motor 120 is provided at one end of the rotary cleaning body 110.

  Then, as shown in FIG. 4B, the dust scraped out by the rotary cleaning body 110 is conveyed from the suction port 100 to the passage R1 of the suction fitting 10B through the suction passage 101, and then the extension pipe 5 (Refer to FIG. 1) and a hose 3 and sucked into a dust collection chamber (not shown) of the cleaner body 2.

  As shown in FIG. 7, the motor housing chamber 13 is formed in the arm portion 10A1 in the left-right direction of the suction tool body 10A. The electric motor 120 is arranged such that the shaft portion 124a protruding from the electric motor 120 is located outside the suction tool main body 10A, and the cover member 125 is located on the center side of the suction mouth main body 10A.

  In the motor housing chamber 13, support portions 13 a and 13 b for supporting the motor 120 are formed in the lower case 11, and support portions 13 c and 13 d are formed in the upper case 12. Each of the support portions 13a to 13d is configured to support four corner portions of a cover member 125 (see FIG. 1) provided at one end portion of the electric motor 120, respectively.

  A gap S1 is formed between the cover member 125 and each of the support portions 13a to 13d. The gap S1 functions as a passage for cooling air after the motor 120 is cooled. It is supposed to be.

  On the other hand, the other arm portion 10A2 of the suction tool main body 10A is provided with a substrate housing chamber 14 on the rear side as shown in FIG. 7, and the substrate housing chamber 14 is used for driving and controlling the motor 120. The control board 10C is arranged. A slit 12a (see FIG. 11, the same applies hereinafter) is formed in the rear portion of the upper case 12 forming the substrate housing chamber 14, and cooling air is introduced from the rear of the upper case 12 through the slit 12a. It is like that.

  Further, cooling air introduced from a rear end slit 150 (see FIG. 11) provided at the rear end portion of the suction tool main body 10A also flows into the substrate storage chamber 14.

  The substrate housing chamber 14 communicates with a passage R3 formed between the upper surface of the lower case 11 and the upper case 12 through an opening 14b provided in the front partition 14a. The passage R3 communicates with the motor housing chamber 13 through an opening 13e '(see FIG. 9) provided in the partition wall 13e that partitions the motor housing chamber 13 on the arm portion 10A1 side. In FIG. 9, 14a and 13e are partition walls, 14b and 13e are openings, and 15 is a unit cover.

  As shown in FIGS. 1 and 10, the electric motor 120 includes a front cap 121, a housing 122 whose one end is fixed to the front cap 121 (a cross-sectional outline) having a substantially oval shape, and other than the housing 122. A rear cap 123 attached to the end portion, an armature 124 having a motor shaft 124a that is disposed in the housing 122 and is rotatably supported by the front cap 121 and the rear cap 123, and an end portion of the rear cap 123 And a cover member 125 to be covered.

  The housing 122 has an intake opening 122b and exhaust openings 122c and 122d. A step surface 123c is provided on the rear cap 123. Inside the curved surface portion of the housing 122, a magnet 122a is fixed by an adhesive and a U-shaped spring 201 as shown in FIG.

  Here, the housing 122 is provided with a substantially rectangular long hole 202 in the axial direction of the electric motor (see FIGS. 1 and 14) that coincides with the center position of the magnet 122a in the short width direction. The width of the long hole 202 (width length in the direction orthogonal to the motor shaft) is based on the simulation results as shown in FIG. 13, and the width of the housing on the part side where the magnet 122a is attached (width length in the direction orthogonal to the motor shaft). 15) of 15% is desirable.

  That is, the value of 15% is a value derived based on a torque-priority design policy of extracting the required torque to the maximum. Therefore, a value of about 30% or less was derived in order to satisfy both the design policies of reducing the weight of the motor and ensuring the required torque, not giving priority to torque. This value can satisfy the required torque and weight reduction requirements.

  In the present embodiment, the long hole 202 is provided only on the curved surface portion on one side where the magnet 122a of the housing 122 exists, but the long hole 202 may be provided on both sides. Further, the shape of the long hole 202 is not limited to a rectangle, and a circular hole may be arranged in the motor axial direction. The shape of the long hole may be any shape, but from the viewpoint of production, a rectangular long hole is most suitable.

  In the housing 122, an intake opening 122 b for introducing cooling air into the housing 122 is formed on the outer peripheral surface on the front cap 121 side.

  Further, an exhaust opening 122 c for discharging cooling air from the housing 122 is formed on the rear cap 123 side of the housing 122. Furthermore, a gap S3 between the magnet 122a and the core 124b in the housing 122, as shown in FIG. 12B, flows into the inside of the electric motor 120 (housing 122) and through which cooling air described later flows. Is formed.

  As shown in FIG. 10C, the front cap 121 has a substantially oval shape in a side view attached to one end portion of the housing 122, and a central portion for supporting the shaft portion 124 a of the armature 124. A bearing 121a is provided.

  As shown in FIG. 12C, the armature 124 has a shaft portion 124a serving as an output shaft, and a core 124b and a commutator 124c are fixed to the shaft portion 124a. The core 124b is manufactured by laminating iron core pieces, and has a plurality (for example, seven in this embodiment) of teeth 124d (see FIG. 12B, the same applies hereinafter) extending radially around the shaft portion 124a. .

  The teeth 124d are formed in a substantially T shape when viewed from the axial direction, and long dovetail slots (for example, seven in this embodiment) are formed between the teeth 124d in the axial direction. A coil is wound around the tooth 124d through a slot.

  The rear cap 123 has a bottomed cylindrical shape that is attached to the end of the housing 122 as shown in FIGS. 1 and 10A, and the center of the bottom 123d is shown in FIG. The part is provided with a bearing portion 123a into which the end portion of the shaft portion 124a of the armature 124 is inserted and supported.

  Further, as shown in FIGS. 1 and 10B, an electric motor substrate 123 b is attached to the end portion of the rear cap 123. The periphery of the electric motor board 123b is covered with a cover member 125. The cover member 125 is attached to the stepped surface 123c of the rear cap 123.

  A brush portion 127 is provided inside the bottom portion 123d of the rear cap 123 as shown in FIGS. 12 (a) and 14 (b). The brush part 127 has a substantially annular brush holder 127a and a conductive brush 127b slidably accommodated in the brush holder 127a. The brush 127b is in sliding contact with the segment 124f of the commutator 124c of the armature 124, and is urged toward the commutator 124c by a spring member 126b held by a support shaft 126a protruding from the bottom 123d. In addition, the front-end | tip part 126c (refer Fig.12 (a)) of the spring member 126b is bent toward the brush 127b.

  In the present embodiment, as shown in FIG. 12A, two brush portions 127 are sandwiched between the commutators 124 c, and when viewed from the axial direction of the electric motor 120, the two brushes 127 b are substantially the same as the housing 122. It is arranged on the diagonal line of the oval shape. The motor housing chamber 13 having a substantially square cross section is also arranged diagonally.

  Further, the outer peripheral side end face 127c of each brush 127b is located on the outer peripheral side of the substantially oval shape of the housing 122, and is a rectangle (indicated by a two-dot chain line in the figure) that is inscribed in the substantially oval shape of the housing 122. ) Is located on the inner periphery side.

  That is, as shown in FIG. 15A, in the motor housing chamber 13 having a substantially rectangular cross section, the dead space DS at the corner formed outside the housing 122 on the diagonal line of the housing 122 is formed. The two brushes 127b can be arranged so as to escape. Thereby, the height dimension H1 of the electric motor housing chamber 13 can be reduced accordingly.

  FIG. 15B shows an example in which two brushes 127b are arranged on the long diameter of the housing 122 having a substantially oval cross section as a comparative example. When two brushes 127b are arranged in the same manner as in the present embodiment, the long diameter direction is shown. The two brushes 127b protrude outside the, and the height dimension H1 of the electric motor housing chamber 13 is increased by this protrusion.

  In this case, as shown by a two-dot chain line in FIG. 15A, if the two brushes 127b ′ provided on the long diameter of the housing 122 having a substantially oval cross section are set short, the height dimension H1 of the motor housing chamber 13 is set. The two brushes 127b 'can be accommodated in the inside, but the two brushes 127b' are shortened as compared with the brushes 127b, and the life of the brushes 127b 'cannot be extended.

  On the other hand, in the present embodiment, as shown in FIG. 12A, the outer peripheral side end surface 127 c of each brush 127 b is on the outer periphery of the substantially oval shape of the housing 122 on the diagonal line of the oval shape of the housing 122. Since the two brushes 127b are arranged on the inner peripheral side of the rectangular shape T (rectangular shape shown by a two-dot chain line in the figure) that is located on the side and in which the substantially oval shape of the housing 122 is inscribed, The two brushes 127b having the same length as that of the comparative example (FIG. 15B) can be used as they are for the electric motor 120, so that the life of the brushes 127b and the life of the electric motor 120 can be extended. It is possible.

  The number of the brush portions 127 is not limited to two, and four brush portions 127 may be provided corresponding to the four corners of the quadrangle T in which the substantially oval shape of the housing 122 is inscribed.

  The electric motor 120 is accommodated in the electric motor accommodating chamber 13 formed by the lower case 11 and the upper case 12 by using the elasticity of the cover member 125. Here, the cover member 125 is made of an elastic material such as synthetic rubber. Therefore, the vibration of the electric motor 120 is difficult to be transmitted to the lower case 11 and the upper case 12.

  As shown in FIG. 1, the front cap 121 is also provided with a bush 128 having elasticity such as synthetic rubber, and the support portion 11f provided in the lower case 11 and the unit cover via the bush 128. The front cap 121 side is supported by a support portion 15f provided at 15 (see FIG. 7). Therefore, the motor 120 has a vibration-proof structure also on the front cap 121 side.

  Then, as shown in FIG. 6B, a small diameter pulley 131 is mounted on the shaft portion 124a of the electric motor 120, and a large diameter pulley 130 is mounted on the shaft portion 110a at the end of the rotary cleaning body 110. Has been. A toothed belt 132 is bridged between them, and power is transmitted from the small diameter pulley 131 to the large diameter pulley 130. Further, a tensioner 133 is provided to prevent tooth skipping and to increase the number of teeth with which the small diameter pulley 131 and the large diameter pulley 130 and the toothed belt 132 are engaged.

  Next, a long hole 202 in the axial direction provided in the housing 122 when a current flows through the motor 120 will be described with reference to a simplified diagram of the motor shown in FIG.

  In FIG. 16, if a current flows through the coil, the magnetic flux generated by the current flowing through the coil is HC1 and HC2, whereas the magnetic flux generated by the magnet 122a is HM.

  The magnetic flux HM, the magnetic flux HC1, and the magnetic flux HC2 all use a housing 122 made of an electromagnetic steel plate as a magnetic circuit. In FIG. 16, the flow of magnetic flux indicated by a solid line generated by passing a current through the coil and the flow of magnetic flux indicated by a broken line generated by the magnet 122a are indicated by arrows, but the drawing is divided into four orthogonal line segments. As a result, in the second quadrant and the fourth quadrant, that is, in the illustrated S portion, the magnetic flux HC1 and the magnetic flux HC2 by the coil are opposite to the magnetic flux HM by the magnet, and the magnetic flux HC1 and the magnetic flux HC2 generated by the coil are from the magnet. The generated magnetic flux HM has been weakened.

  Therefore, in this embodiment, in order to weaken the magnetic flux HC1, the axial direction of the electric motor 120 is set at the center (vertex) of the arc portion in the width direction (the direction orthogonal to the electric motor shaft) of the housing surface 122d on the side where the magnet 122a exists. A long rectangular long hole 202 is provided. Thereby, since the magnetic circuit of magnetic flux HC1 is interrupted on the way, it can suppress that magnetic flux HM weakens because magnetic flux HC1 weakens.

  The housing 122 is manufactured by bending a flat steel plate and joining the end portions. However, if the elongated hole 202 is provided in the abutting portion 122e, the molding maintaining effect of the housing 122 may be impaired. It is practical to provide a long hole 202 on the housing surface 122d opposite to the mating portion 122e.

  However, if there is no problem in maintaining the shape of the abutting portion 122e, a similar elongated hole is provided on the surface of the housing facing the abutting portion 122e facing (on the diagonal line) the above-described elongated hole 202 in the magnetic flux HC2. Similar effects can be obtained.

  On the other hand, in terms of the influence on the magnetic flux HM, the shape of the magnet 122a is an arc-shaped magnet, and the apex of the arc of the magnet 122a having a small magnetic flux density is made to coincide with the center of the long hole 202. There is almost no action, and therefore, by adding the long hole 202, it is possible to reduce the weight and improve the torque without reducing the efficiency.

  Here, although it is the specification of the rectangular long hole 202, about the width | variety length (length in the direction orthogonal to a motor shaft), the magnet 122a of the motor is installed from the simulation result as shown in FIG. 15% or less of the width of the side housing (width in the direction orthogonal to the motor shaft) is desirable, but is not necessarily limited to this, and may be selected appropriately according to the product specifications. .

  That is, the value of 15% is a value derived based on a torque-priority design policy of extracting the required torque to the maximum. Therefore, a value of about 30% or less was derived in order to satisfy both the design policies of reducing the weight of the motor and ensuring the required torque, not giving priority to torque. This value can satisfy the required torque and weight reduction requirements.

  The length of the long hole 202 (the length in the motor shaft direction) is set to about half the length in the axial direction of the magnet 122a in FIG. It is set in the range of 3 to 3/4. However, this is not necessarily limited to this, and may be selected appropriately according to the product specifications.

  In short, since it is only necessary to suppress the magnetic flux generated by the current flowing through the coil from weakening the magnetic flux of the magnet by the long hole 202, an appropriate shape in design can be determined.

  Further, as an incidental effect, the weight of the motor housing 122 can be reduced by providing the long hole 202, and thus the weight of the motor can be expected to be reduced.

Next, cooling of the electric motor 120 will be described.
In the present embodiment, air is introduced from an inlet provided separately from the suction port 100 of the suction tool 10 by the suction force of an electric blower (not shown) provided in the cleaner body 2, and this is used as cooling air. Yes.

  As shown in FIG. 11, a rear end slit 150 is provided on the rear side of the lower case 11 of the suction tool main body 10A as the introduction port. The rear end slit 150 is provided in a state in which the opening faces obliquely upward and rearward in front of the wheel 11 d provided in the lower case 11.

  Here, as shown in FIG. 17, the rear end slit 150 communicates with a passage R2 formed between an upper plate 151 continuous therewith and a lower plate (not shown). , Communicated with the substrate housing chamber 14. Therefore, the cooling air introduced through the rear end slit 150 flows into the substrate storage chamber 14 through the passage R2 and cools the control substrate 10C. Further, air behind the arm portion 10A2 is introduced into the substrate housing chamber 14 through the slit 12a of the upper case 12, and the control substrate 10C is also cooled by this air.

  The cooling air flowing into the substrate housing chamber 14 then flows into the passage R3 through the opening 14b of the partition wall 14a, and then flows into the motor housing chamber 13 from the passage R3 through the opening 13e 'of the partition wall 13e (FIGS. 7 and 9). reference).

  Thereafter, the cooling air flowing into the motor housing chamber 13 flows into the housing 122 through the opening 122b of the motor 120 in the motor housing chamber 13, passes between the core 124b and the magnet 122a, and cools the core 124b. .

  Thereafter, the air that has cooled the inside of the housing 122 is discharged to the outside of the electric motor 120 through the opening 122c and the opening 122d formed on the side surface (see FIG. 9A), and flows into the passage R4. And it flows in into the suction fitting joint 10B through the end opening 7a of the rotation shaft 7 of the suction joint 10B from the passage R4, and flows into the passage R1. Therefore, the cooling air flows in the electric motor 120 from the side of the shaft portion 124 a protruding from the electric motor 120 toward the cover member 125. That is, the cooling air flows in the electric motor 120 from the outside of the suction tool main body 10A toward the center side.

  Therefore, the air that has passed through the electric motor 120 and has cooled the electric motor 120 flows into the passage R1 together with dust or the like that may be generated from the brush 127b. In addition, as shown in FIG. 11, the slit 12c may be provided in the position corresponding to the electric motor storage chamber 13 in the upper case 12, and cooling air may be directly introduced into the electric motor storage chamber 13 through the slit 12c.

  Also with this configuration, the electric motor 120 can be suitably cooled. A filter (not shown) may be disposed in the slit 12c or the like so as to suppress dust from flowing into the electric motor housing chamber 13.

  In addition, since the air discharged from the opening 122C of the motor becomes high temperature, there is a possibility that the surrounding resin may be softened. Therefore, air for cooling the air discharged from the opening 122C from the passage R3 is used. A bypass 203 for mixing may be provided (see FIG. 9). However, in that case, it is necessary to pay attention to the ratio of the flow path area between the opening 13e 'and the bypass 203.

  In addition, the installation of the long hole 202 in the present embodiment is not limited to the electric motor for the suction tool of the vacuum cleaner, but is effective as a method for reducing the weight without sacrificing efficiency and torque with respect to a DC motor using a magnet. .

  1 ... Vacuum cleaner, 2 ... Vacuum cleaner body, 3 ... Hose, 4 ... Hand control, 5 ... Extension pipe, 5a, 5b ... Tube, 7 ... Rotating shaft, 7a ... End opening of suction joint, 7b ... rotating part, 8 ... bumper, 10 ... suction tool, 10A ... suction tool body, 10A1 ... suction tool body arm part, 10A2 ... suction tool body arm part, 10B ... suction tool joint, 10C ... control board, 11 ... bottom Case, 11a ... Brush drive switch, 11b ... Brush cover, 11c ... Brush cover, 11d ... Wheel, 11f ... Supporting part, 12 ... Upper case, 12a ... Slit, 12c ... Slit, 13 ... Motor housing chamber, 13a ... Motor support 13b: Electric motor support, 13c: Electric motor support, 13d: Electric motor support, 13e: Bulkhead, 13e ... Opening, 13f: Partition, 14 ... Substrate housing chamber, 14a: Bulkhead, 14b: Opening, 15 ... Unit cover, 15f ... Supporting part, 100 ... Suction port, 101 ... Suction passage, 110 ... Rotary cleaning body, 110a ... Shaft part of rotary cleaning body, 111 ... Cylindrical substrate, 112a ... Cleaning member, 112a ... Clean The outer periphery of the cleaning member 112a, 112b ... the cleaning member, 112b ... the outer periphery of the cleaning member 112b, 112c ... the cleaning member, 112d ... the cleaning member, 113 ... the roller member, 120 ... the electric motor, 121 ... the front cap, 121a ... the bearing portion, 122 ... Housing 122a ... Magnet 122b ... Opening (intake) 122c ... Opening (exhaust) 122d ... Opening (exhaust) 123 ... Rear cap 123a ... Shaft part 123b ... Motor substrate 123c ... Step surface 123d ... Bottom, 124 ... Armature, 124a ... Motor shaft, 124b ... Core, 124c ... Commutator, 124d ... Teeth, 124f ... Segment of commutator, 125 ... Cover member, 126a ... Support shaft, 126b ... Spring member, 126c ... Spring member Tip part, 127 ... Brush part, 127a ... Brush holder, 127b ... Brush, 127c ... Outer peripheral side of brush, 128 ... Bush, 130 ... Large pulley, 131 ... Small pulley, 132 ... Toothed belt, 133 ... Tensioner, 150 ... rear end slit, 151 ... upper plate, 201 ... U-shape Pulling, 202 ... elongated hole, 203 ... bypass.

Claims (8)

A vacuum cleaner main body, a hose connected to the vacuum cleaner main body, a hand operating part connected to the hose, an extension pipe connected to the hand operating part, and a suction tool attached to the extension pipe In the vacuum cleaner
The suction tool includes therein a rotary cleaning body and an electric motor that rotationally drives the rotary cleaning body, and an axial direction of the electric motor shaft is disposed in a portion of the housing of the magnet installed in the electric motor housing. A vacuum cleaner characterized by forming a long hole extending in the direction. 2. The vacuum cleaner according to claim 1, wherein the long hole provided in the housing is formed at a central position in the short width direction of the magnet. A DC motor provided between the lower case and the upper case, a rotary cleaning body driven by the DC motor arranged in the suction port provided in the lower case, and dust sucked from the suction port In the suction tool of the vacuum cleaner with the passage to be transferred,
The DC motor includes a housing in which at least two magnets are fixed, an armature around which a coil that forms a magnetic field in cooperation with the magnet is wound, and a motor shaft fixed to the armature. A suction tool for a vacuum cleaner, wherein a long hole extending along a direction of the electric motor shaft is formed on a surface of the housing to which the magnet is fixed. In the suction tool of the vacuum cleaner of Claim 3,
A suction tool for a vacuum cleaner, wherein the magnet has an arcuate cross section perpendicular to the motor shaft, and the elongated hole is formed along the apex of the arc. In the suction tool of the vacuum cleaner of Claim 3,
The suction tool for a vacuum cleaner, wherein a length of the long hole in a direction orthogonal to the motor shaft is about 30% or less of a width of the housing on a side where the magnet is installed. In the suction tool of the vacuum cleaner of Claim 3,
The suction tool for a vacuum cleaner, wherein a length of the long hole in a direction orthogonal to the motor shaft is about 15% or less of a width of the housing on a side where the magnet is installed. In the suction tool of the vacuum cleaner of Claim 6,
The suction tool for an electric vacuum cleaner according to claim 1, wherein the length of the elongated hole in the motor shaft direction is in the range of 1/3 to 3/4 of the length of the magnet in the motor shaft direction. In the suction tool of the vacuum cleaner of Claim 7,
The suction tool for a vacuum cleaner, wherein the length of the elongated hole in the motor shaft direction is about half of the length of the magnet in the motor shaft direction.

Images