JP2017140475A - Self-propelled electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-propelled electronic device having improved riding performance on a stepped portion on an indoor floor surface. A housing having a bottom plate, a pair of left and right drive wheel units that support the housing, and a resilient member that resiliently urges the drive wheel unit to protrude downward from the bottom plate. The drive wheel unit includes a drive wheel and a drive wheel holder that rotatably holds the drive wheel around the first axis, and the drive wheel holder is disposed rearward of the first axis. And is attached to the housing so as to be rotatable about a second axis parallel to the first axis, and is perpendicular to a straight line connecting the first axis and the second axis and the first axis. The urging force of the elastic member is applied to the drive wheel unit so that the pressing force directed from one axis toward the outer periphery of the drive wheel is directed forward in the traveling direction rather than the gravitational direction of the housing. A self-propelled electronic device characterized by being configured. [Selection] Figure 4

Description

  The present invention relates to a self-propelled electronic device, and more particularly to a self-propelled electronic device capable of traveling on a floor having a step.

  As a self-propelled electronic device, Patent Document 1 discloses a housing having a suction port on a lower surface, a pair of left and right drive wheels that support and travel the housing, and a main brush provided rotatably at the suction port. There has been proposed a self-propelled cleaner provided with a side brush (auxiliary brush) provided to be rotatable forward of the main brush on the lower surface of the housing.

Japanese Patent Application Laid-Open No. 2012-125652

  Such a self-propelled cleaner performs cleaning while traveling on the floor surface of the room. However, when there is a stepped portion on the floor surface, it becomes difficult to ride when the stepped portion becomes higher than a certain height. For example, there is a step between the floor and the carpet laid on the floor, a step with a sill that divides the room, a step with a floor partially laid on the tatami, etc. When the step-up performance of the self-propelled cleaner is low, the self-propelled cleaner may avoid the stepped portion, and the indoor area over the stepped portion may not be cleaned.

  The present invention has been made in view of the above circumstances, and provides a self-propelled electronic device with improved riding performance on a stepped portion on a floor surface.

Thus, according to the present invention, a housing having a bottom plate, a pair of left and right drive wheel units that support the housing, and a bullet that urges and urges the drive wheel unit in a direction that projects downward from the bottom plate. With members,
The drive wheel unit includes a drive wheel and a drive wheel holder that holds the drive wheel rotatably around the first axis,
The drive wheel holder is disposed behind the first axis, and is attached to the housing so as to be rotatable around a second axis parallel to the first axis.
The pressing force that is perpendicular to the straight line connecting the first axis and the second axis and that extends from the first axis toward the outer periphery of the drive wheel is directed forward in the traveling direction rather than the gravitational direction of the casing. Thus, a self-propelled electronic device configured to apply a biasing force of the elastic member to the drive wheel unit is provided.
According to the present invention, a housing having a bottom plate;
A pair of left and right drive wheel units that support the housing;
A motor member for rotating the drive wheel;
A resilient member that resiliently urges the drive wheel unit in a direction to project downward from the bottom plate,
The pair of driving wheels are controlled to rotate forward in the same direction and advance, and reversely rotate in the same direction to move backward.
The drive wheel unit includes a drive wheel and a drive wheel holder that rotatably holds the drive wheel around the first axis.
The motor member is disposed on the drive wheel holder so as not to overlap the drive wheel in the first axial direction behind the first axis.
The drive wheel holder is disposed behind the first axis and is parallel to the first axis.
It is attached to the case so that it can rotate around its axis,
The elastic member has a front end attached to a specific position in the housing, and a rear end attached to the drive wheel holder,
A self-propelled electronic device in which the height of the second axial center from the floor surface is set lower than the height of the first axial center in a state where the driving wheel is in contact with the floor surface is provided.
According to the present invention, the elastic member may be the self-propelled electronic device according to claim 1, wherein the elastic member is arranged in a substantially horizontal direction above the drive wheel holder.
Further, according to the present invention, the center of gravity of the self-propelled electronic device may be a self-propelled electronic device located behind the first axis.

In the self-propelled electronic device according to the present invention, the pressing force that is perpendicular to the straight line connecting the first axis and the second axis and that extends from the first axis toward the outer periphery of the drive wheel is The urging force of the elastic member is applied to the drive wheel unit so as to be directed forward in the traveling direction rather than the gravity direction.
With this configuration, the step-over performance of the self-propelled electronic device is improved.

It is a perspective view of the self-propelled electronic device concerning Embodiment 1 of the present invention. It is a bottom view of the self-propelled electronic device shown in FIG. It is a figure explaining arrangement | positioning of the drive wheel unit in the self-propelled electronic device of Embodiment 1. FIG. FIG. 3 is a perspective view of a drive wheel unit in the first embodiment. It is a figure explaining the level | step climbing performance of a self-propelled electronic device, Comprising: (A) shows Embodiment 1, (B) has shown the comparative example. The drive wheel unit U2 in Embodiment 2 is shown, (A) is a side view, (B) is a perspective view. It is a side view which compares the outer peripheral shape of the tire part of each drive wheel in Embodiment 1 and 2. FIG. It is a figure explaining the step overcoming performance by the trapezoid convex part with a large inclination-angle of the tire part in Embodiment 2. FIG. It is a figure explaining the step climbing performance by the trapezoid convex part with a small inclination | tilt angle of a tire part.

(Embodiment 1)
1 is a perspective view of a self-propelled electronic device according to Embodiment 1 of the present invention, FIG. 2 is a bottom view of the self-propelled electronic device shown in FIG. 1, and FIG. FIG. 4 is a perspective view of the drive wheel unit according to the first embodiment.
In the first embodiment, the self-propelled electronic device 1 according to the present invention sucks air containing dust on the floor surface and exhausts the air from which dust is removed while self-propelled on the floor surface where it is installed. The case of the self-propelled cleaner which cleans the floor surface by doing is illustrated.

The self-propelled electronic device 1 includes a disk-shaped housing 2, and a rotating brush 9, an auxiliary brush 10, a dust collection box 30, an electric blower (not shown), and a pair of left and right are provided inside and outside the housing 2. Components such as a control unit including drive wheels 29, rear wheels 26 and front wheels 27, and floor surface detection sensors 13 and 19 are provided. The self-propelled electronic device 1 is characterized by the structure of the drive wheel unit U1 including the drive wheels 29. This feature will be described in detail after the entire configuration of the self-propelled electronic device 1 is described. To do.

  In this self-propelled electronic device 1, the part where the front wheel 27 is arranged is the front part, the part where the rear wheel 26 is arranged is the rear part, and the part where the dust collection box 30 is arranged is the intermediate part, When stopped and traveling on a horizontal plane, the housing 2 is supported by three wheels, that is, a pair of left and right drive wheels 29 and a rear wheel 26. That is, the front is the forward direction of the self-propelled cleaner 1, and the rear is the backward direction.

  The housing 2 opens and closes when the dust collection box 30 is taken in and out of the housing 2 and the bottom plate 2a having a suction port 6 formed at a position near the boundary with the intermediate portion in the front portion. A top plate 2b having a lid portion 3 at an intermediate portion, and a bottom plate 2a and a side plate 2c having an annular shape in plan view provided along the outer periphery of the top plate 2b are provided. The bottom plate 2a is formed with a plurality of holes for projecting the lower portions of the front wheel 27, the pair of left and right drive wheels 29 and the rear wheel 26 from the inside of the housing 2 to the outside of the top plate 2b. An exhaust port 7 is formed in the vicinity of the boundary. In addition, the side plate 2c is divided into two in the front and rear directions, and the front side portion of the side plate functions as a bumper.

  In addition, inside the housing 2, the front portion has a front storage chamber for storing a motor unit, an electric blower, an ion generator, etc. (not shown), and the intermediate portion has an intermediate storage chamber for storing the dust collection box 30. The rear portion has a rear storage chamber for storing a control board, a battery, a charging terminal, and the like (not shown), and has a suction passage and an exhaust passage in the vicinity of the boundary between the front portion and the intermediate portion. As a result, in the self-propelled cleaner 1 according to the present embodiment, the center of gravity exists behind the first axis of the drive wheel 29 described later.

  The suction port 6 is an open surface of a recess formed on the bottom surface of the housing 2 (the lower surface of the bottom plate 2a) so as to face the floor surface. A rotating brush 9 that rotates about a rotation axis parallel to the bottom surface of the housing 2 is provided in the recess, and the left and right sides of the recess rotate about a rotation axis that is perpendicular to the bottom surface of the housing 2. An auxiliary brush 10 is provided. The rotating brush 9 is formed by implanting a brush spirally on the outer peripheral surface of a roller that is a rotating shaft. The auxiliary brush 10 is formed by radially providing a bristle bundle at the lower end of the rotating shaft. The rotating shaft of the rotating brush 9 and the rotating shaft of the pair of auxiliary brushes 10 are pivotally attached to a part of the bottom plate 2a of the housing 2, and include a motor unit, a pulley, a belt, and the like provided in the vicinity thereof. It is independently connected through a mechanism.

  This self-propelled electronic device 1 turns when the left and right drive wheels 29 rotate forward in the same direction, move forward, move backward in the same direction, move backward, and rotate in opposite directions. For example, when the self-propelled electronic device 1 reaches the periphery of the cleaning area or collides with an obstacle on the course, the driving wheel 29 stops and the left and right driving wheels 29 rotate in opposite directions to each other. change. Thereby, the self-propelled electronic device 1 can be self-propelled while avoiding obstacles in the entire installation place or the entire desired range.

<Driving wheel unit and its mounting structure>
The drive wheel unit U1 includes the drive wheel 29 and a drive wheel holder 41 that holds the drive wheel 29 so as to be rotatable around the first axis P1.

The drive wheel 29 has a wheel part (not shown) centered on the first axis P1 and a tire part 29a attached to the outer periphery of the wheel part. The tire portion 29a has a plurality of rectangular convex portions 29a1 and a plurality of concave portions 29a2 on the outer periphery, and is circular when viewed from the direction of the first axis P1. That is, two tires in which the rectangular convex portions 29a1 and the concave portions 29a2 are alternately arranged in the circumferential direction are prepared, and the tires are bonded together so that the concave portion 29a2 of the other tire is positioned beside the rectangular convex portion 29a1 of one tire. 29a is formed. At this time, since there are no gaps, cuts, cuts, or the like between the rectangular convex portion 29a1 of one tire and the rectangular convex portion 29a1 of the other tire adjacent thereto, the tire portion 29a is located from the first axis P1 direction. It is circular when viewed.

The drive wheel holder 41 is attached to the housing 2 so as to be rotatable around a second axis P2 parallel to the first axis P1.
More specifically, the drive wheel holder 41 is a substantially shoe-shaped gear case in a side view having a gear therein, and includes a front portion where the first axis P1 is disposed and a rear portion where the second axis P2 is disposed. And a rearwardly projecting piece 41a and a pivot shaft 41b serving as the second axis P2. Further, the drive wheel holder 41 is provided with a motor M capable of rotating in the forward and reverse directions on the inner surface of the rear portion thereof, and the rotational force of the motor M is driven through a gear and a drive shaft (not shown) on the first axis P1. It is configured to transmit to the wheel 29. A wheel cover portion 41 d that covers the wheel portion of the drive wheel 29 is provided on the inner side surface of the front portion of the drive wheel holder 41.

The first axis P1 is disposed at a substantially middle position in the longitudinal direction of the housing 2, and the first axis
The pivot shaft 41b is pivotally attached to a rib in the housing 2 so that the second axis P2 is disposed behind the axis P1. At this time, the height H2 of the second axis P2 from the floor K is set lower than the height H1 of the first axis P1 in a state where the drive wheel 29 is in contact with the floor K.
In FIG. 3, reference symbol CP denotes a comparative example that is set at a position higher than the height H1 of the first axis P1 from the floor surface K in a state where the drive wheels 29 are in contact with the floor surface K. 3 horizontal axes are shown.

Further, the drive wheel holder 41 is located at a position higher than the height H2 of the second axis P2 from the floor surface K with the drive wheel 29 in contact with the floor surface K and above the second axis P2. The projection 41c is pulled toward the first axis P1 by a resilient member S (for example, a tension spring). The protrusion 41c has a hook 41c1 at the upper end.
In the first embodiment, a tension spring is used as the resilient member S, the rear end of the resilient member S is hooked on the hook portion 41c1, and the rear end of the resilient member S is a drive provided in the housing 2. It is hooked on the hook portion 2f of the wheel cover 2e.

FIGS. 5A and 5B are diagrams for explaining the step-over performance of the self-propelled electronic device, in which FIG. 5A shows the first embodiment and FIG. 5B shows a comparative example.
According to the self-propelled electronic device 1 of the first embodiment configured as described above, as shown in FIG. 3 and FIG. 5 (A), between the floor surface K and the rug J laid on the floor surface K. When the drive wheel 29 tries to get over the stepped portion D, the front wheel 27 rides on the stepped portion D first. Thereby, the housing 2 is supported by the front wheel 27 and the rear wheel 26. Instead of the front wheel 27, a protrusion having a slope surface that slides over the corner of the stepped portion D over the bottom surface of the housing 2 may be provided, or the corner of the stepped portion D may be slidably contacted with the bottom surface. (Not shown). In this case, when the self-propelled electronic device 1 gets over the stepped portion D, the housing 2 is supported by the protruding portion or the bottom surface of the housing and the rear wheel 26.

In this state, the driving wheel 29 of the driving wheel unit U1 is not pressed against the floor surface K by the weight of the housing 2, but is pressed by the urging force of the elastic member S. That is, the driving wheel unit U1 is pressed toward the floor surface K with the second axis P2 as a fulcrum by the urging force F of the elastic member S. At this time, the drive wheel 29 is pressed against the floor surface K with a pressing force R in a direction perpendicular to the line A connecting the second axis P2 and the first axis P1.
This pressing force R is expressed as a resultant force of the first component force R1 overcoming the step portion D and the first component force R1 and the second component force R2 perpendicular to the first component force R1. The first component force R1 is expressed as a component force on a line connecting the contact point between the drive wheel 29 and the corner of the step portion D and the second axis P1.

In the case of the comparative example shown in FIG. 5B, the height of the second axis CP is set higher than the height H1 of the first axis P1 (see FIG. 3). Other configurations in the comparative example are the same as the self-propelled electronic device 1 of the present invention.
In the case of the comparative example, the driving wheel 29 is pressed against the floor surface K with a pressing force CR perpendicular to the line CA connecting the second axis CP and the first axis P1. The pressing force CR is equivalent to the pressing force R in the first embodiment shown in FIG. 5A, and the first component force CR1 and the first component force C that overcome the step portion D are obtained.
It is expressed as a resultant force of R1 and the second component force CR2 in the perpendicular direction. The first component force CR1 is expressed as a component force on a line connecting the contact point between the drive wheel 29 and the corner of the step portion D and the second axis CP.
The pressing forces R and CR are the maximum values Rmax and CRmax of the pressing forces R and CR at which the self-propelled electronic device 1 does not lift up with the self-propelled electronic device 1 installed on the floor K as shown in FIG. It is determined as appropriate in consideration of variations in the urging force F of the elastic member S.

When Embodiment 1 (FIG. 5A) is compared with the comparative example (FIG. 5B), it can be seen that there is the following difference.
In the case of the first embodiment, since the line A slightly rises from the second axis P2 toward the first axis P1, the direction of the pressing force R is inclined slightly forward from the vertical direction with respect to the floor surface K. ing. On the other hand, in the case of the comparative example, the line CA slightly descends from the second axis CP toward the first axis P1, so the direction of the pressing force CR is slightly more than the direction perpendicular to the floor surface K. Tilt backwards.
Here, θ and Cθ shown in FIGS. 5A and 5B are
θ <Cθ
It becomes. As described above, when R and CR have the same variation in the weight of the self-propelled electronic device 1 and the biasing force F of the elastic member S,
R = CR
The urging force F and the urging force CF are adjusted so that Therefore,
R1 = Rcos (θ)> CRcos (Cθ) = CR1
Thus, R1> CR1 holds.

From these facts, it can be seen that the first component force R1 of the first embodiment, which is the pressing force to the corner of the stepped portion D of the drive wheel 29, is larger than the first component force CR1 of the comparative example.
The dynamic friction coefficient between the drive wheel 29 and the corner of the step D is μ, the dynamic friction force is Ff,
CFf
Ff = μR1> μCR1 = CFf
Thus, Ff> CFf holds. That is, when comparing the frictional force with respect to the corner of the stepped portion D, the first embodiment is larger than the comparative example, and therefore, it can be said that the first embodiment has better step over performance than the comparative example.
Thus, in the self-propelled electronic device 1 of the present invention shown in FIG. 5 (A), the first component force R1 which is the pressing force to the corner of the stepped portion D of the drive wheel 29 is increased, and the step overcoming performance is achieved. In order to improve, the height H2 of the second axis P2 is set lower than the height H1 of the first axis P1, and the resilient member S is positioned above the second axis P2 in the drive wheel unit U1. An urging force F is applied.

The action line L connecting the second axis P2 and the hook part 41c1 in the first embodiment is longer than the action line CL connecting the second axis CP and the hook part 41c1 in the comparative example. In order to obtain the pressures R and CR, the urging force F of the elastic member S (tensile spring) can be made smaller in the first embodiment than in the comparative example. In other words, if the components in the tangent direction to the circle centered on the second axis P2 of the urging force F and CF of the elastic member S (the tension spring) are FR and CFR,
A x R = L x FR
CA x CR = CL x CFR
Since A = CA and R = CR,
L x FR = CL x CFR
If L> CL, FR <CFR holds. Here, when the urging force F of the elastic member S (the tension spring) is close to the tangential direction of the circle centered on the second axis P2, it can be approximated as F = FR and CF = CFR. Therefore,
F <CF
It becomes. Thus, since the urging force F of the resilient member S (the tension spring) can be reduced, the spring can be reduced in size and workability at the time of attachment can be improved.

(Embodiment 2)
Further, according to the present embodiment, even when the center of gravity of the self-propelled electronic device 1 is behind the first axis P1 of the drive wheel 29, the step-over performance of the drive wheel 29 can be improved. That is, when the center of gravity of the self-propelled cleaner 1 is behind the first axis P1 of the drive wheel 29, the drive wheel 2
Even when 9 reaches the corner of the stepped portion D, and the front side of the drive wheel 29 of the housing 2 gets over the stepped portion D, the rear side of the housing 2 with the center of gravity still does not get over the stepped portion D. There is a strong need to improve the step-over performance by the drive wheels 29. As described above, according to the present embodiment, even when the center of gravity of the self-propelled electronic device 1 is behind the first axis P1 of the drive wheel 29, the step-over performance of the drive wheel 29 can be improved. As a result, the degree of freedom of the layout inside the housing 2 is improved. However, even when the center of gravity of the self-propelled electronic device 1 is in front of the first axis P1 of the drive wheel 29, the step climbing performance is similarly improved according to this embodiment.

(Embodiment 3)
6A and 6B show the drive wheel unit U2 in the second embodiment, where FIG. 6A is a side view and FIG. 6B is a perspective view. FIG. 7 is a side view comparing the outer peripheral shape of the tire portion of each drive wheel in the first and second embodiments. FIG. 8 is a diagram for explaining step climbing performance due to a trapezoidal convex portion with a large inclination angle of the tire portion in the second embodiment, and FIG. 9 is a diagram for explaining step climbing performance due to a trapezoid convex portion with a small inclination angle of the tire portion. is there. In FIGS. 6A and 6B, the same reference numerals are given to the same elements as those in FIGS.

The difference between the second embodiment and the first embodiment is only the drive wheel 129 of the drive wheel unit U2, and the other configurations in the second embodiment are the same as those in the first embodiment.
More specifically, the drive wheel 129 has a wheel part (not shown) and a tire part 129a attached to the outer periphery of the wheel part. The tire portion 129a has a plurality of trapezoidal convex portions 129a1 and a plurality of concave portions 129a2 on the outer periphery, and has an uneven outer peripheral shape when viewed from the direction of the first axis P1.

  That is, two tires in which the trapezoidal convex portion 129a1 and the concave portion 129a2 are alternately arranged in the circumferential direction are prepared, and the tires are bonded together so that the concave portion 129a2 of the other tire is positioned beside the trapezoidal convex portion 129a1 of one tire. 129a is formed. At this time, since there is a V-shaped gap between the trapezoidal convex portion 129a1 of one tire and the trapezoidal convex portion 129a1 of the other tire adjacent thereto, the tire portion 129a has an uneven outer periphery when viewed from the direction of the first axis P1. It has a shape.

Further, the trapezoidal convex portion 129a1 of the tire portion 129a has an upstream inclined surface portion 129a11 on the upstream side Us when the tire portion 129a rotates in the forward direction (arrow direction) across the radiation G from the first axis P1. And a downstream inclined surface portion 129a12 on the downstream side Ds.
The downstream inclined surface portion 129a12 is set to have a larger inclination angle with respect to the radiation G than the upstream inclined surface portion 129a11. In other words, the upstream inclined surface portion 129a11 is set so as to be closer to the radiation G than the downstream inclined surface portion 129a12.
On the other hand, the rectangular convex portion 29a1 of the tire portion 29a of the first embodiment has vertical surface portions 29a11 and 29a12 substantially parallel to the radiation G on both sides of the radiation G from the first axis P1.

According to the self-propelled cleaner of the second embodiment, since the tire portion 129a has an uneven outer shape when viewed from the direction of the first axis P1, unevenness on the outer periphery of the tire portion 129a is likely to be applied to the step portion D. In addition, the rotational force of the tire portion 129a can be effectively used for the force in the direction of riding on the stepped portion D.
In addition, as shown in FIG. 8, since the inclined surface α 129 a 12 on the downstream side of the trapezoidal convex portion 129 a 1 of the tire portion 129 a is set to have a large inclination angle α with respect to the radiation G, the rotational force of the tire portion 129 a is increased. It can be used effectively for the force in the direction of riding on the part D. That is, the cut angle of the groove is adjusted so that the tire portion 129a hits the upper surface of the step portion D with a flat surface (downstream inclined surface portion 129a12). Further, since the distance W1 at which the trapezoidal convex portion 129a1 can be hooked on the stepped portion D is increased by setting the inclination angle α large, the trapezoidal convex portion 129a1 is easily hooked to the depth of the stepped portion D. Thereby, for example, it becomes effective when a self-propelled electronic device gets over a threshold with a rounded corner.

On the other hand, as shown in FIG. 9, the downstream inclined surface portion of the trapezoidal convex portion 129 a 1 of the tire portion 129 a (
When the inclination angle β of the dotted line portion) is set to be small with respect to the radiation G, the trapezoidal convex portion 129a1
Since the distance W2 that can be hooked on the stepped portion D is shortened, it becomes difficult to effectively use the rotational force of the tire portion 129a for the force in the direction of climbing on the stepped portion D, and the trapezoidal convex portion 129a1 is formed on the stepped portion. It becomes difficult to get to the back of D.

  For these reasons, the self-propelled cleaner according to the second embodiment further improves the step-over performance. In addition, in the case of Embodiment 2, the case where the height DH gets over the level | step-difference part D of 15-20 mm is assumed.

(Embodiment 4)
In the first and second embodiments, the case where the self-propelled electronic device 1 is a self-propelled cleaner having a cleaning function is illustrated, but the self-propelled electronic device of the present invention has a self-propelled ion having a function of generating ions. It may be a generator.

(Summary)
A self-propelled electronic device according to the present invention includes a housing having a bottom plate, a pair of left and right drive wheel units that support the housing, and elastically biases the drive wheel unit in a direction in which the drive wheel unit protrudes downward from the bottom plate. A resilient member,
The drive wheel unit includes a drive wheel and a drive wheel holder that holds the drive wheel rotatably around the first axis,
The drive wheel holder is disposed behind the first axis, and is attached to the housing so as to be rotatable around a second axis parallel to the first axis.
The pressing force that is perpendicular to the straight line connecting the first axis and the second axis and that extends from the first axis toward the outer periphery of the drive wheel is directed forward in the traveling direction rather than the gravitational direction of the casing. Thus, it is comprised so that the urging | biasing force of the said elastic member may be applied with respect to the said drive wheel unit.

The self-propelled electronic device of the present invention may be configured as follows, or may be appropriately combined.
(1) In a state where the drive wheel is in contact with the floor surface, the height of the second axis from the floor may be set lower than the height of the first axis.
In this configuration, the height of the second axial center from the floor surface is set higher than the height of the first axial center, and the resilient member is positioned above the second axial center in the drive wheel unit. Compared with the case where an urging force is applied, the force with which the driving wheel presses the corner of the stepped portion while moving forward increases, so that the step-over performance of the self-propelled electronic device is improved. This effect of the present invention is particularly effective when the center of gravity of the self-propelled electronic device is at the rear.

(2) The drive wheel holder may have a protrusion at a position above the second axis that is attached to the elastic member and pulled toward the first axis.
This is advantageous because the elastic member can be arranged in the space for arranging the drive wheel unit in the housing.

(3) The drive wheel may have an uneven outer peripheral shape viewed from the direction of the first axis.
In this way, the unevenness on the outer periphery of the drive wheel is easily caught by the step, so the frictional resistance between the drive wheel and the step portion increases, and the step over performance of the self-propelled electronic device is further improved.

(4) The self-propelled electronic device may be a self-propelled electronic device having a cleaning function or a self-propelled ion generator having an ion generating function.
In this way, a self-propelled electronic device or a self-propelled ion generator with improved step-over performance can be obtained.

  The disclosed embodiments should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  Although the embodiments of the present invention have been described above, various modifications can be made without departing from the spirit of the invention.
  The contents of means for solving the problems at the beginning of the filing of the present application are added below.

DESCRIPTION OF SYMBOLS 1 Self-propelled electronic device 2 Case 2a Bottom plate 29, 129 Drive wheel 41 Drive wheel holder 41c Protrusion part H1, H2 Height K Floor surface P1 1st axis P2 2nd axis S Repulsion member U Drive wheel unit

Claims (3)

A housing having a bottom plate;
A pair of left and right drive wheel units that support the housing;
A motor member for rotating the drive wheel;
A resilient member that resiliently urges the drive wheel unit in a direction to project downward from the bottom plate,
The pair of driving wheels are controlled to rotate forward in the same direction and advance, and reversely rotate in the same direction to move backward.
The drive wheel unit includes a drive wheel and a drive wheel holder that rotatably holds the drive wheel around the first axis.
The motor member is disposed on the drive wheel holder so as not to overlap the drive wheel in the first axial direction behind the first axis.
The drive wheel holder is disposed behind the first axis and attached to the housing so as to be rotatable around a second axis parallel to the first axis.
The self-propelled electronic device, wherein the height of the second axial center from the floor surface is set lower than the height of the first axial center in a state where the driving wheel is in contact with the floor surface. The self-propelled electronic device according to claim 1, wherein the elastic member is disposed in a substantially horizontal direction at an upper portion of the driving wheel holder. 3. The self-propelled electronic device according to claim 1, wherein the center of gravity of the self-propelled electronic device is located behind the first axis.