JP5517709B2 - Vacuum cleaner and its mouthpiece - Google Patents

Description

  The present invention relates to a mouthpiece (for example, a power brush) having a rotary cleaning body driven by a driving unit and a vacuum cleaner including the mouthpiece.

  The current general vacuum cleaner has a structure called a canister type in which a vacuum cleaner body equipped with a dust collector and a floor suction body for sucking dust on the floor surface are connected by an extension pipe or a suction hose. . This vacuum cleaner main body has a dust collector and an electric blower inside thereof, and has a structure that can be freely moved via wheels. On the other hand, in order to clean the floor surface, the floor suction body is provided with a rotating brush and its drive unit inside, and by rotating this rotating brush, the floor surface dust is picked up and sucked. It has a structure.

  As a means for transmitting the driving force from the drive unit to the rotating brush, a large-diameter pulley is provided on the rotating brush, and a small-diameter pulley is provided on the driving unit side, and a toothed belt is connected between them to transmit the driving force from the driving unit to the rotating brush. doing.

  Patent Document 1 proposes a suction body that can maintain a predetermined tension in a transmission pulley by a tension pulley. Specifically, a tension pulley is in contact with the inner periphery of the belt.

  Also in Patent Document 2, the tension rotor is in contact with the inner periphery of the transmission belt.

  In Patent Document 3, in a horizontal state, the tension rotor presses between the pulleys of the belt to generate tension for transmitting the driving force to the belt, and the belt is pressed by the tension rotor when the protection plate is rotated inward. It has been released.

JP 2003-93282 A JP-A-7-39495 Japanese Patent Publication No. 61-52686

  The mouthpiece's rotating brush has a function to clean the carpet with long bristle feet and to allow the mouthpiece to move forward with the rotational force of the brush when cleaning the carpet for easy operation. A large driving torque is required.

  Therefore, a large driving torque is obtained by increasing the reduction ratio by increasing the number of teeth of the large-diameter pulley and decreasing the number of teeth of the small-diameter pulley.

  In order to increase the driving torque, it is necessary to increase the number of teeth of the large diameter pulley or decrease the number of teeth of the small diameter pulley.

  However, in order to increase the number of teeth of the large-diameter pulley, it is necessary to increase the diameter of the large-diameter pulley, and as a result, the diameter of the rotating brush also increases. If it does so, the height from the floor surface of a mouthpiece will increase, and there existed a trouble that a trouble point, such as a mouthpiece not entering in a narrow place, produced.

  Therefore, as the number of teeth on the small-diameter pulley decreases, the belt winding angle decreases and tooth skipping (a phenomenon in which the belt teeth climb onto the pulley teeth and move to the next tooth gap in an instant) occurs, resulting in noise and noise. Causes belt teeth to shear.

  Further, if the belt width is increased in order to prevent the tooth skipping, a range in which dust is not removed with respect to the lateral width of the suction body is increased.

  In order to prevent tooth skipping, it is also effective to increase the tension of the toothed belt by increasing the distance between the shafts of the small diameter pulley and large diameter pulley. In this case, however, the meshing vibration between the belt and the pulley increases. However, noise will increase. In addition, the life of the belt is shortened and the loss of the bearing is increased.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a mouthpiece that can transmit a necessary driving torque without increasing the size of the mouthpiece and hardly generates tooth skipping and noise increase, and a vacuum cleaner using the mouthpiece. is there.

In order to solve the above problems, the present invention provides an electric vacuum blower including an electric blower that generates a suction force, a dust collection unit that stores dust, and a suction body, wherein the suction body has a surface to be cleaned. A rotary cleaning body having a rubbing and rubbing member; a drive unit for driving the rotary cleaning body; a large-diameter pulley on the rotary cleaning body side for transmitting a driving force from the drive unit to the rotary cleaning body; The drive unit has a small-diameter pulley and a toothed belt that connects between the large-diameter pulley and the small-diameter pulley, and the suction body includes the toothed belt between the small-diameter pulley and the large-diameter pulley. A tension pulley is provided on the back side of the belt and above the suction body, which is the loose side of the toothed belt, and the rotation center of the tension pulley includes an outer periphery of the small diameter pulley and an outer periphery of the large diameter pulley. Two to tie Is arranged between the tangent, closer to the small-diameter pulley than an intermediate of a line connecting the centers of rotation and the large diameter pulley of the small-diameter pulley,
The lower end of the outer periphery of the tension pulley, the Ri lower der than a line parallel to the street the line the outer periphery of the small diameter pulley, the length of the line segment is less than twice the diameter of the large-diameter pulley .

  According to the present invention, the belt winding angle of the small diameter pulley (first pulley) and the belt winding angle of the large diameter pulley (second pulley) can be increased, and tooth skipping can be prevented.

  In addition, according to the present invention, it is not necessary to increase the distance between the small-diameter pulley and the large-diameter pulley in order to prevent tooth skipping, and an appropriate inter-axis distance can be set, so that noise due to pulley meshing vibration is reduced. In addition, it is possible to prevent the life of the toothed belt (belt) from being shortened and the loss of the bearing from being increased.

The external view of the vacuum cleaner by this form example. The top view of the suction body of the vacuum cleaner by this form example. The bottom view of the mouthpiece of the vacuum cleaner by this invention. The center sectional view of the mouthpiece of the vacuum cleaner by this form example. The top view of the suction body of the vacuum cleaner by this form example. The upper surface enlarged view of the suction body of the vacuum cleaner by this form example. The bottom enlarged view of the mouthpiece of the vacuum cleaner by this example. The AA 'sectional view of the mouthpiece of the vacuum cleaner by this form example. The rotary brush removal exploded view of the mouthpiece of the vacuum cleaner by this form example. BB 'sectional drawing of the suction body of the vacuum cleaner by this form example. The rotary brush removal exploded view of the mouthpiece of the vacuum cleaner by this form example. The schematic diagram of the positional relationship of the small diameter pulley of a suction body of a vacuum cleaner by this example, a large diameter pulley, and a tension pulley.

  The mouthpiece includes a rotating cleaning body (for example, a rotating brush) having a rubbing member (for example, bristles) that rubs the surface to be cleaned, and a drive unit (for example, a brush driving motor) that drives the rotating cleaning body. A large-diameter pulley on the rotary cleaning body side for transmitting a driving force from the drive unit to the rotary cleaning body; a small-diameter pulley on the drive part side; and teeth connecting the large-diameter pulley and the small-diameter pulley. The suction body has a tension pulley between the small-diameter pulley and the large-diameter pulley on the back surface of the toothed belt and on the upper side of the suction body.

  The mouthpiece includes a room (for example, a brush chamber) that opens to the surface to be cleaned, a rotary cleaning body (for example, a rotating brush) that is rotatably disposed in the room, and a drive unit (for example, a brush driving electric motor). ), A first pulley (for example, a small-diameter pulley) coupled to the drive unit, a second pulley (for example, a large-diameter pulley) coupled to the rotary cleaning body, the first pulley, and the first pulley A belt (for example, a toothed belt) that connects the two pulleys and a third pulley (for example, a tension pulley) that abuts the outer periphery of the belt, and the third pulley is the outer periphery of the belt. The chamber is in contact with the outer periphery on the side opposite to the side where the opening is formed.

  The mouthpiece includes a room (for example, a brush chamber) that opens to the surface to be cleaned, a rotary cleaning body (for example, a rotating brush) that is rotatably disposed in the room, and a drive unit (for example, a brush driving electric motor). ), A first pulley (for example, a small-diameter pulley) coupled to the drive unit, a second pulley (for example, a large-diameter pulley) coupled to the rotary cleaning body, the first pulley, and the first pulley A belt (for example, a toothed belt) that connects two pulleys and a third pulley (for example, a tension pulley) that contacts the outer periphery of the belt, and the rotary cleaning body is removable from the room. The third pulley is in contact with the outer periphery of the belt on the side opposite to the direction in which the rotary cleaning body is removed.

  And according to this invention, the belt winding angle of a small diameter pulley (1st pulley) and the belt winding angle of a large diameter pulley (2nd pulley) can be enlarged, and a tooth skip can be prevented. In addition, it is not necessary to increase the distance between the shafts of the small diameter pulley and large diameter pulley to prevent tooth skipping, and it can be set to an appropriate distance between the shafts, so noise due to pulley meshing vibration is reduced and the life of the belt is shortened. It is possible to suppress the shortening and the increase in bearing loss.

  Further, by providing the tension pulley on the loose side of the toothed belt, unnecessary vibration due to the resonance of the toothed belt can be suppressed, and noise can be reduced.

  Further, by fixing the shaft for attaching the tension pulley between the upper case and the lower case, the tension pulley can be attached in a small size and at low cost without using a separate member.

  Also, when adjusting the tension of the toothed belt during mass production, adjust the mating surface of the upper case and lower case (for example, extend the upper case and scrape the lower case to adjust the tension pulley mounting position. Can be easily performed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an external view of a vacuum cleaner according to the present invention. In FIG. 1, 101 is a vacuum cleaner body that generates suction force and captures / accommodates dust, 102 is a hollow suction hose connected to the suction side of the vacuum cleaner body, and 103 is one end of the suction hose 102. A hollow hand handle connected to the other end, 104 is an operation unit that is disposed on the hand handle 103 and can accept operations such as ON / OFF of the cleaner body 101, and 105 has one end connected to the other end of the hand handle. A telescopic and hollow extension tube 106 is a suction body mainly for cleaning the floor, the root end of which is connected to the other end of the extension tube. An electric blower that generates a suction force and a dust collection chamber are provided on the suction side of the electric blower inside the main body casing that forms the outline of the vacuum cleaner main body 101. The mouthpiece 106 has a substantially T-shape. The suction hose 102 is detachable from the cleaner main body 101, the extension pipe 105 is detachable from the hand handle 103, and the suction body 106 is detachable from the extension pipe 105. Although not shown, the suction hose 102 and the extension pipe 105 are provided with a power line for transmitting power supplied from the cleaner body 101 to the suction body 106.

  FIG. 2 shows a top view of the mouthpiece of the vacuum cleaner according to this embodiment. In FIG. 2, 201 is an upper case of the mouthpiece 106, 202 is a universal joint pipe that has a ventilation passage for air containing dust inside and can be rotated back and forth, and left and right, and 203 to 204 are brush drive motors 501 in the mouthpiece. It is a contact pin for supplying electric power to. In a state where the suction body 106 is connected to the extension pipe 105, the contact pins 203 and 204 are connected to the power line of the extension pipe 105.

  FIG. 3 shows a bottom view of the mouthpiece of the vacuum cleaner according to this embodiment. In FIG. 3, 301 is a lower case of the suction body 106, 302 is a rotating brush (rotary cleaning body), 303 is a brush drive switch for detecting whether or not the bottom surface of the suction body 106 is in contact with the surface to be cleaned, and 304 A brush cover for removing the rotating brush 302, 305 is a brush cover on the belt side, and 306 is a wheel. The brush drive switch 303 includes a wheel, and is attached via a spring (not shown) so that the wheel always protrudes from the bottom surface of the mouthpiece 106. The brush drive switch 303 stops the driving of the brush driving motor when the wheels are protruding, and turns off the rotation of the rotating brush 302. On the other hand, the wheel touches the floor and the mouthpiece 106. When housed inside, the brush driving motor is driven to turn on the rotating brush 302 to enhance safety. In addition, a large wheel 306 is provided at the rear end of the mouthpiece 106, and through the large wheel 306, it is subjected to the stress of the forward / backward movement and rotation operation operated by the hand handle 103, and The bottom surface is brought into close contact with the floor surface to improve the operation performance of the mouthpiece. An outer shell of the mouthpiece 106 is formed by the upper case 201 and the lower case 301. In the rotating brush 302, hairs extending in the radial direction are implanted in a spiral on the outer peripheral surface of a cylindrical base.

  FIG. 4 shows a central cross-sectional view of the mouthpiece of the vacuum cleaner according to this embodiment. In FIG. 4, 302 is a rotating brush, and 401 is a brush chamber that houses the rotating brush 302. The lower case 301 is formed with a substantially semi-cylindrical brush chamber 401 (room). The brush chamber 401 opens toward the surface to be cleaned. That is, the opening of the brush chamber 401 is formed on the bottom surface of the suction body 106. The rotating brush 302 is rotatably accommodated in the brush chamber 401. For example, shafts are provided at both ends in the axial direction of the rotating brush 302, bearings are provided at both ends in the axial direction of the brush chamber, and the shaft of the rotating brush 302 is supported by the bearings in the brush chamber 401. The rotating brush 302 can be rotatably supported in the brush chamber 401.

  The brush chamber 401 and the extension pipe 105 communicate with each other via a universal joint pipe 202 having an air passage including dust inside. The dust wound up by the rotating brush 302 is carried to the extension pipe 105 through the flow path indicated by the arrow 402, and further to the dust collecting chamber of the cleaner body 101 through the suction hose body 102.

  The top view in the state which removed the upper case 201 of the suction body of the vacuum cleaner by this embodiment in FIG. 5 is shown. In FIG. 5, reference numeral 501 denotes a brush drive motor (motor), and 502 denotes a circuit board that controls the brush drive motor 501. The brush drive motor 501 forms a drive unit that drives the rotating brush 302. The brush driving motor 501 and the control circuit board 502 are formed on the rear side of the brush chamber 401. The brush driving motor 501 and the control circuit board 502 are formed on the opposite sides with respect to the center of the suction body 106 in the left-right direction. The channel described with reference to FIG. 4 is formed in the central portion of the suction body 106 in the left-right direction. The brush driving electric motor 501 may be disposed at the central portion of the suction body 106 in the left-right direction. That is, the brush driving motor 501 may be formed below the flow path.

  Although not shown, the contact pins 203 to 204, the brush driving motor 501 and the control circuit board 502 are connected by a power cord. The electric power supplied from the contact pins 203 and 204 is supplied to the brush drive motor 501 and the control circuit board 502.

  The upper surface enlarged view in the state which removed the upper case 201 of the suction body of the vacuum cleaner by this embodiment in FIG. 6 is shown. In particular, an enlarged top view on the right side of FIG. 5 is shown. In FIG. 6, reference numeral 601 denotes a rotating shaft (shaft) of the brush driving motor 501, 602 a small-diameter pulley attached to the rotating shaft 601, 603 a bearing for supporting the rotating shaft 601, and 604 a rotating shaft of the rotating brush 302. A large-diameter pulley attached to (shaft), 605 is a toothed belt for transmitting power from the small-diameter pulley 602 to the large-diameter pulley 604, 606 is a tension pulley, and 607 is a shaft for fixing the tension pulley 606. . A toothed belt 605 is fitted so as to straddle the outer periphery of the small-diameter pulley 602 and the outer periphery of the large-diameter pulley 604. The small-diameter pulley 602, the large-diameter pulley 604, and the toothed belt 605 constitute transmission means for transmitting the driving force of the brush driving electric motor 501 to the rotating brush 302.

  As shown in FIG. 6, the tension pulley 606 is disposed on the upper case 201 side with respect to the toothed belt 605 in the front-rear direction. The tension pulley 606 is disposed between the small diameter pulley 602 and the large diameter pulley 604 in the front-rear direction. In the front-rear direction, the center of rotation of the tension pulley 606 (shaft 607) is smaller than the center of rotation of the small-diameter pulley 602 (rotary shaft 601) and the center of rotation of the large-diameter pulley 604 (rotary shaft). It is preferably formed on the rotation center side of the shaft 601). That is, in the front-rear direction, the tension pulley 606 is preferably formed closer to the small-diameter pulley 602 than the large-diameter pulley 604. The axial direction of the shaft 607 of the tension pulley 606 is substantially the same as the axial direction of the rotating shaft 601 of the brush drive motor 501 and the rotating shaft of the rotating brush 302. Therefore, the rotation direction of the tension pulley 606 is substantially the same as the rotation direction of the brush drive motor 501 and the rotation direction of the rotary brush 302. A shaft 607 is passed through the rotation center of the tension pulley 606, and both axial ends of the shaft 607 are sandwiched between and supported by the upper case 201 and the lower case 301. That is, the tension pulley 606 is rotatably supported in the suction body 106 by the shaft 607. The outer peripheral surface of the tension pulley 606 is preferably a smooth surface. However, teeth may be formed on the outer peripheral surface of the tension pulley 606. If the outer peripheral surface of the tension pulley 606 is a smooth surface, the tension pulley 606 may not rotate with respect to the suction body 106. The cross section of the outer peripheral surface of the tension pulley 606 is a planar shape as shown in FIG. However, the cross section of the outer peripheral surface of the tension pulley 606 may be concave, U-shaped, or V-shaped.

  The small-diameter pulley 602 rotates with the rotating shaft 601 of the brush driving motor 501, and the large-diameter pulley 604 also rotates with the rotating shaft of the rotating brush 302. The outer diameter of the small diameter pulley 602 is smaller than the outer diameter of the large diameter pulley 604. Therefore, although the rotational speed of the rotary brush 302 becomes slower than the brush drive motor 501, the torque increases accordingly. The outer periphery of the small diameter pulley 602 and the outer periphery of the large diameter pulley 604 have teeth. That is, the outer periphery of the small diameter pulley 602 and the outer periphery of the large diameter pulley 604 have irregularities. The small diameter pulley 602 and the large diameter pulley 604 are gears. The pitch of teeth on the outer periphery of the small-diameter pulley 602 (interdental distance) and the pitch of teeth on the outer periphery of the large-diameter pulley 604 (interdental distance) are preferably substantially the same. Therefore, the number of teeth of the small diameter pulley 602 is smaller than the number of teeth of the large diameter pulley 604. The inner circumference of the toothed belt 605 has teeth at a pitch corresponding to the tooth pitch of the small diameter pulley 602 and the large diameter pulley 604. That is, the inner periphery of the toothed belt 605 also has irregularities. However, the teeth of the small-diameter pulley 602, the teeth of the large-diameter pulley 604, and the teeth of the toothed belt 605 may be omitted. The cross section of the inner peripheral surface of the toothed belt 605 has a planar shape.

  When there is no tension pulley 606, the winding angle of the toothed belt 605 at the large diameter pulley 604 is larger than 180 degrees, but the winding angle of the toothed belt 605 at the small diameter pulley 602 is from 180 degrees. Becomes smaller. Therefore, the small-diameter pulley 602 is more likely to cause tooth skipping of the toothed belt 605 than the large-diameter pulley 604. Further, when the tooth pitch of the small-diameter pulley 602 and the tooth pitch of the large-diameter pulley 604 are approximately the same, the number of teeth that the teeth of the small-diameter pulley 602 and the teeth of the toothed belt 605 mesh with each other is the number of teeth of the large-diameter pulley 604. Since the number of teeth meshing with the teeth of the belt 605 is smaller, the small-diameter pulley 602 is more likely to have tooth skipping than the large-diameter pulley 604.

  FIG. 7 shows an enlarged bottom view of the mouthpiece of the vacuum cleaner according to this embodiment. FIG. 7 shows a state where the brush cover 305 is removed for easy understanding. In FIG. 7, reference numeral 701 denotes a clutch for removing the rotating brush 302 from the large-diameter pulley 604, and reference numeral 702 denotes a belt width of the toothed belt 605. The clutch 701 includes two clutches (a set of clutches), one clutch being fixed to the base of the rotating brush 302 and the other clutch being fixed to the rotating shaft of the large-diameter pulley 604. When one clutch is engaged with the other clutch, the clutches are connected to each other, and thus the rotating brush 302 and the large-diameter pulley 604 are connected. However, the clutch 701 is not an essential configuration. Since the tension pulley 606 is disposed on the upper case 201 side, the tension pulley 606 cannot be seen in the view of the suction body 106 from the bottom as shown in FIG.

  FIG. 8 is a cross-sectional view taken along the line AA ′ in FIG. FIG. 12 is a schematic diagram of a positional relationship among the small-diameter pulley 602, the large-diameter pulley 604, and the tension pulley 606 in FIG. In FIG. 8, reference numeral 801 denotes a belt winding angle of the small-diameter pulley 602 (angle where the belt and the pulley are in contact), 802 denotes a belt winding angle of the large-diameter pulley 604, and 803 denotes a rotation direction of the large-diameter pulley 604 (FIG. 8). , Counter-clockwise) 1201 is a rotating shaft of the large-diameter pulley 604. As shown in FIGS. 8 and 12, the rotation center 1202 of the small-diameter pulley 602 is located above the rotation center 1204 of the large-diameter pulley 604. In other words, the small diameter pulley 602 is disposed above the large diameter pulley 604.

  The tension pulley 606 is disposed at a position where it comes into contact with the outer periphery of the toothed belt 605 between the small diameter pulley 602 and the large diameter pulley 604. That is, as shown in FIG. 12, in the front-rear direction, the rotation center 1203 of the tension pulley 606 is disposed between the rotation center 1202 of the small-diameter pulley 602 and the rotation center 1204 of the large-diameter pulley 604. As shown in FIG. 12, in the vertical direction, the rotation center 1203 of the tension pulley 606 is disposed between two tangent lines (dotted lines) 1205 and 1206 connecting the outer periphery of the small-diameter pulley 602 and the outer periphery of the large-diameter pulley 604. . Therefore, regardless of whether the bottom surface of the suction body 106 is in contact with or not in contact with the surface to be cleaned, that is, regardless of whether the brush drive motor 501 is driven / stopped by the brush drive switch 303, the tension pulley 606 is always a toothed belt. 605 is in contact with the outer periphery. Further, in the front-rear direction, the rotation center 1203 of the tension pulley 606 is an intermediate line (one-dot broken line) in the middle of a line segment (one-dot broken line) 1207 connecting the rotation center 1202 of the small-diameter pulley 602 and the rotation center 1204 of the large-diameter pulley 604. ) It is preferably closer to the small diameter pulley 602 than 1208. Further, in the front-rear direction, the rotation center 1203 of the tension pulley 606 is aligned with the outer periphery of the small-diameter pulley 602 and the large-diameter pulley 604 on a line segment 1207 connecting the rotation center 1202 of the small-diameter pulley 602 and the rotation center 1204 of the large-diameter pulley 604. It may be closer to the small-diameter pulley 602 than an intermediate line (one-dot broken line) 1209 in the middle between the outer periphery. Furthermore, in the vertical direction, the lower end of the outer periphery of the tension pulley 606 is preferably on the lower side (tangential line 1206 side) than the line (dotted line) 1210 passing through the outer periphery of the small-diameter pulley 602 and parallel to the line segment 1207. As a result, the belt winding angle 801 of the small-diameter pulley 602 can be made larger than 180 degrees. Therefore, the belt winding angles of both the small diameter pulley 602 and the large diameter pulley 604 can be made larger than 180 degrees. The tangent lines 1205 and 1206 are positions where the toothed belt 605 is formed when the tension pulley 606 is not provided.

  Since the small-diameter pulley 602 on the drive source side rotates counterclockwise, tension is applied to the lower portion (corresponding to the tangent 1206) than the upper portion (corresponding to the tangent 1205) of the toothed belt 605. Therefore, the tension pulley 606 is disposed at a position where the tension pulley 606 contacts the outer periphery of the side where no tension is applied, that is, the upper portion of the toothed belt 605. As a result, the tension applied to the tension pulley 606 is also reduced, and the load applied to the tension pulley 606 can be reduced.

  The outer diameter of the tension pulley 606 is preferably smaller than the outer diameters of the large diameter pulley 604 and the small diameter pulley 602. However, the outer diameter of the tension pulley 606 may be larger than the outer diameters of the large-diameter pulley 604 and the small-diameter pulley 602, or between the outer diameter of the large-diameter pulley 604 and the outer diameter of the small-diameter pulley 602. Good. In the vertical direction, the position of the upper end of the outer periphery of the tension pulley 606 is preferably substantially the same as the position of the upper end of the outer periphery of the small-diameter pulley 602. That is, in the vertical direction, the upper end of the outer periphery of the tension pulley 606 is preferably on a horizontal line (two-dot broken line) 1211 passing through the upper end of the outer periphery of the small-diameter pulley 602. Thereby, it is possible to suppress an increase in the height (length in the vertical direction) of the transmission means due to the addition of the tension pulley 606. In the vertical direction, the rotation center 1203 of the tension pulley 606 is preferably located above the rotation center 1202 of the small-diameter pulley 602. That is, in the vertical direction, the rotation center 1203 of the tension pulley 606 is preferably positioned above the horizontal line (two-dot broken line) 1212 passing through the rotation center 1202 of the small-diameter pulley 602.

  FIG. 9 shows an exploded view of the rotary brush 302 of the mouthpiece of the vacuum cleaner according to this embodiment. In FIG. 9, reference numeral 901 denotes a lever for removing the brush cover 304. A screw may be used instead of the lever 901. When removing the rotating brush 302, first, the lever 901 is opened to disengage the brush cover 304, and the brush cover 304 is removed. Thereby, the rotary brush 302 can be lifted and removed from the brush cover 304 side. Conversely, when the rotating brush 302 is attached, the clutch 701 on the opposite side of the rotating brush 302 and the brush cover 304 is engaged, the rotating brush 302 is accommodated in the brush chamber 401, the brush cover 304 is attached, and the lever 901 is closed. . Since the toothed belt 605 exists on the clutch 701 side and the rotary brush 302 and the large-diameter pulley 604 can be separated by the clutch 701, the toothed belt 605 is detached from the large-diameter pulley 604 or attached when removing the rotary brush. Therefore, it is easy to remove the rotating brush. However, the large-diameter pulley 604 and the small-diameter pulley 602 may exist on the brush cover 304 side.

  FIG. 10 is a sectional view taken along line BB ′ in FIG. Reference numeral 1001 denotes a relative attaching / detaching direction of the upper case 201 and the lower case 301. As can be seen from FIG. 10, the shaft 607 for fixing the tension pulley 606 is fixed by being inserted into the upper case 201 and the lower case 301 of the suction body 106.

  FIG. 11 shows an exploded view of the rotating brush when the large-diameter pulley is fixed to the rotating brush. The case where the large-diameter pulley 604 is fixed to the rotating brush 1101 is a case where the clutch 701 is not provided. In FIG. 11, reference numeral 1101 denotes a rotating brush to which the large-diameter pulley 604 is fixed, and 1102 denotes an attaching / detaching direction of the rotating brush 1101 with respect to the brush chamber 401. When the large-diameter pulley 604 is fixed, it is necessary to remove or attach the toothed belt 605 from the large-diameter pulley 604. The rotating brush 1101 is attached to and detached from the brush chamber 401 in a substantially vertical direction. The rotating brush 1101 is removed from the brush chamber 401 on the opening side of the brush chamber 401, that is, on the bottom surface side of the suction body 106, and attached from the opening side of the brush chamber 401, that is, the bottom surface side of the suction body 106. Since the tension pulley 606 is arranged on the outer peripheral side of the toothed belt 605 and on the side opposite to the removal direction of the rotating brush 1101 and the large-diameter pulley 604 (upper side), the tension pulley 606 is disposed inside the toothed belt 605. Compared to the case where the rotating brush 1101 and the large-diameter pulley 604 are removed from or attached to the brush chamber 401, the tension pulley 606 is attached to the circumferential side and the outer peripheral side as compared with the case where the rotating brush 1101 and the large-diameter pulley 604 are attached. Since it is not obstructed, the rotating brush 1101 and the large-diameter pulley 604 are easy.

  Hereinafter, the operation of the embodiment according to the present invention will be described in detail with reference to the drawings.

  When the cleaner user operates the operation unit 104 such as a hand switch disposed near the hand handle 103, the electric blower in the cleaner body 101 operates in an operation mode according to the operated switch. The suction force generated by the electric blower reaches the suction body 106 through the suction hose 102 and the extension pipe 105. At the same time, the power supplied from the power lines provided on the suction hose 102 and the extension pipe 105 drives the brush driving motor 501 via the contact pins 203 to 204. As a result, the small-diameter pulley 602 attached to the rotary shaft 601 rotates, and this power is transmitted to the large-diameter pulley 604 by the toothed belt 605. The rotation of the large-diameter pulley 604 is transmitted to the rotating brush 302 via the clutch 701, and the rotating brush 302 rotates.

  The rotating brush 302 has a function of cleaning the carpet having a long bristle and a function of the mouthpiece 106 to advance by the rotational force of the brush when cleaning on the carpet in order to realize easy operability. A large driving torque is required. Therefore, a large driving torque is obtained by increasing the number of teeth of the large-diameter pulley 604 and decreasing the number of teeth of the small-diameter pulley 602 to increase the reduction ratio.

  However, in order to increase the number of teeth of the large diameter pulley 604, it is necessary to increase the diameter of the large diameter pulley, and as a result, the diameter of the rotating brush 302 also increases. As a result, the height of the mouthpiece 106 from the floor surface increases, causing problems such as the mouthpiece not being able to enter the narrow space.

  Therefore, when the number of teeth of the small-diameter pulley 602 is reduced, the belt winding angle 801 is reduced and tooth skipping (a phenomenon in which the belt teeth ride on the pulley teeth and move to the next tooth gap in an instant) occurs. It causes noise and shearing of belt teeth.

  In order to prevent the tooth skipping, it is also effective to increase the belt width 702. However, in the case of the mouthpiece, if the belt width 702 is increased, there is a range in which dust is not removed with respect to the lateral width of the mouthpiece 106. It gets bigger.

  In order to prevent the tooth skipping, it is also effective to increase the tension of the toothed belt 605 by increasing the distance between the shafts of the small-diameter pulley 602 and the large-diameter pulley 604. In this case, however, the engagement between the belt and the pulley is effective. Vibration increases and noise increases. In addition, the life of the belt is shortened and the loss of the bearing is increased.

  Therefore, in this embodiment, a tension pulley 606 is provided between the small diameter pulley 602 and the large diameter pulley 604. By using the tension pulley 606 from the back surface (outer peripheral surface) of the toothed belt 605, the belt winding angle 801 of the small diameter pulley 602 and the belt winding angle 802 of the large diameter pulley 604 can be increased to prevent tooth skipping. Can do.

  At this time, by installing the tension pulley 606 at a position closer to the small-diameter pulley 602 than the large-diameter pulley 604, the belt winding angle 801 of the small-diameter pulley 602 that is likely to skip teeth can be made larger.

  Further, in order to prevent tooth skipping, it is not necessary to increase the distance between the shafts of the small-diameter pulley 602 and the large-diameter pulley 604 and an appropriate inter-axis distance can be set, so that noise due to meshing vibration between the toothed belt 605 and the pulley can be prevented. The belt life is not shortened and the bearing loss is not increased. When the tension of the toothed belt 605 is increased, noise due to meshing vibration between the toothed belt 605 and the pulley is likely to be generated, but the belt winding angle 801 of the small diameter pulley 602 and the belt winding angle 802 of the large diameter pulley 604 are increased. By doing so, the tension of the toothed belt 605 can be reduced, so that the generation of noise can be suppressed.

  Further, by providing the tension pulley 606 on the loose side (the side where the tension is small) of the toothed belt 605, unnecessary vibration due to resonance of the toothed belt 605 can be suppressed and noise can be reduced.

  Further, by fixing the shaft 607 for attaching the tension pulley 606 between the upper case 201 and the lower case 301, the tension pulley 606 can be attached in a small and inexpensive manner without using a separate member.

  Also, in the case of fine adjustment of the tension of the toothed belt 605 during mass production, the mating surface of the upper case 201 and the lower case 301 is adjusted (for example, the tension is obtained by extending the upper case 201 and scraping the lower case 301. This can be done easily by lowering the mounting position of the pulley 606).

  In addition, as shown in FIG. 11, when a large-diameter pulley is fixed to the rotating brush 1101, the tension pulley 606 is provided on the side opposite to the rotating brush removal direction (upper side). Don't be. Further, since the peripheral length of the toothed belt 605 is longer than that without the tension pulley 606, the toothed belt 605 can be easily detached and attached to the rotating brush.

  Further, since the characteristics of the toothed belt 605 deteriorate when the oil component is touched, the material of the tension pulley 606 is preferably a resin such as polyoxymethylene (POM).

DESCRIPTION OF SYMBOLS 101 Vacuum cleaner main body 102 Suction hose 103 Hand handle 104 Operation part 105 Extension pipe 106 Suction body 302,1101 Rotating brush (Rotating cleaning body)
501 Brush driving motor 502 Control circuit board 601 Brush driving motor rotating shaft 602 Small diameter pulley 603 Bearing 604 Large diameter pulley 605 Toothed belt 606 Tension pulley 607 Shaft 701 Clutch 801, 802 Belt winding angle 803 Arrow 901 Lever 1001, 1102 Attachment / detachment direction 1201 Rotating shaft 1202, 1203, 1204 Rotation center 1205, 1206 Tangent line 1207 Line segment 1208, 1209 Intermediate line 1210 Line 1211, 1212 Horizontal line

Claims (5)

In an electric vacuum cleaner comprising an electric blower that generates a suction force, a dust collecting part for storing garbage, and a suction body,
The mouthpiece includes a rotary cleaning body having a rubbing member that rubs a surface to be cleaned, a drive unit that drives the rotary cleaning body, and the drive unit that transmits driving force from the drive unit to the rotary cleaning body. A large-diameter pulley on the rotary cleaning body side, a small-diameter pulley on the drive unit side, and a toothed belt that connects between the large-diameter pulley and the small-diameter pulley;
The mouthpiece has a tension pulley between the small diameter pulley and the large diameter pulley on the back side of the toothed belt and on the loose side of the toothed belt, above the mouthpiece.
The rotation center of the tension pulley is disposed between two tangents connecting the outer periphery of the small diameter pulley and the outer periphery of the large diameter pulley, and connects the rotation center of the small diameter pulley and the rotation center of the large diameter pulley. Closer to the small pulley than the middle of the minute,
The lower end of the outer periphery of the tension pulley, Ri bottom der than a line parallel to the outer periphery as the segment of the small-diameter pulley,
The length of the said line segment is shorter than twice the diameter of the said large diameter pulley, The vacuum cleaner characterized by the above-mentioned . The vacuum cleaner according to claim 1,
The center of rotation of the tension pulley is closer to the small diameter pulley than the middle between the outer periphery of the small diameter pulley and the outer periphery of the large diameter pulley. The vacuum cleaner according to claim 1 or 2,
The vacuum cleaner characterized in that the position of the upper end of the outer periphery of the tension pulley is substantially the same as the position of the upper end of the outer periphery of the small-diameter pulley. The electric vacuum cleaner according to any one of claims 1 to 3,
A vacuum cleaner characterized in that a shaft to which the tension pulley is attached is fixed by being sandwiched between an upper case of the suction body and a lower case of the suction body . The vacuum cleaner according to any one of claims 1 to 4,
The vacuum cleaner is characterized in that a material of the tension pulley is a resin containing polyoxymethylene (POM) .

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