JP7633660B2 - Vehicle viewing device with electrically operated storage unit - Google Patents

Description

The present invention relates to a vehicle visual confirmation device equipped with an electric storage unit, such as a vehicle side mirror, that can reduce variation in the position of each component of the drive mechanism of the electric storage unit.

Conventionally, it has been known that vehicle visual confirmation devices installed on the side of a vehicle, such as side mirrors, are configured to rotate using an electric storage unit and fold up on the side of the vehicle when not in use.

This electric storage unit is configured to rotate the torque of an electric motor installed inside it around the shaft on the vehicle side using a drive mechanism, specifically, a worm on the motor shaft, a worm wheel, a drive worm, and a sun gear fixed to the shaft on the vehicle body side.

These drive mechanisms - the worm, worm wheel, drive worm and sun gear - transmit rotational force by meshing with their respective gears, but if the positional relationship between the teeth of these gears is not constant, there will be variation in position and abnormal noise will be generated.

Therefore, the following Patent Document 1 proposes supporting a sun gear (limiting gear) on a case (rotating member) that supports the worm wheel and drive worm, thereby stabilizing the tooth contact of these gears without changing the support positions of these drive mechanisms.

Patent No. 6662565

In the electric storage unit, the torque of the electric motor is transmitted from a worm attached to the motor shaft to a worm wheel, and then to a sun gear via a drive worm that rotates integrally with the worm wheel.

At this time, a rotational force (circumferential force of the sun gear) and a radial force (diameter force of the sun gear) act on the sun gear from the drive worm, but since the radial force changes the position of the sun gear, the aforementioned Patent Document 1 is configured so that the sun gear is supported in the radial direction by the case (rotating member).

However, if we look closely at the support structure for the sun gear in Patent Document 1, we see that a support tube (28) is provided in the case (26), and the radially inner portion (inner peripheral surface) of the gear plate (limiting gear, sun gear) (48) is supported against this support tube (28) (see Figure 1, paragraphs [0051] and [0056]).

However, when the inner peripheral surface of the sun gear is supported by the support tube of the case in this way, the radial force acts on the portion of the sun gear with a smaller diameter than the gear diameter, so the load acts locally on the support tube of the case, causing deformation of the support tube, which in turn causes displacement of the sun gear and may cause changes in the tooth contact of the gears.

The present invention was made in consideration of these points, and its purpose is to provide a vehicle viewing device equipped with an electric storage unit, in which the sun gear of the drive mechanism of the electric storage unit is supported by a case that also supports a drive worm, etc., suppressing positional variation while preventing radial forces from acting locally on the sun gear case, so that when a rotational force is applied from the electric motor, the sun gear does not displace, and the gear teeth do not change and abnormal noises do not occur.

To achieve this objective, this invention is characterized in that in a vehicle viewing device that is installed on the side of a vehicle and equipped with an electric storage unit, a sun gear that is restricted in rotation relative to a shaft on the vehicle body side is supported by a case that supports a drive worm, etc., and is positioned relative to the case by the outer circumferential surface of the sun gear.

Specifically, the first invention is a vehicle visualization device equipped with an electric storage unit that is installed on the side of the vehicle and configured to rotate between an unfolded position and a folded position, the electric storage unit comprising an electric motor provided inside a case and a drive mechanism that transmits the rotational force of the electric motor so that the case rotates around a shaft provided on the vehicle side, the drive mechanism comprising a sun gear installed in a state in which rotation is restricted around the shaft, and a drive worm that transmits the rotational force from the electric motor to the sun gear, the sun gear and the drive worm are configured to be positioned and supported by the case, a smooth surface without gears is set on the outer peripheral surface of the sun gear, the smooth surface is the outer peripheral surface of the sun gear, and the positioning position of the sun gear relative to the case is set on the outer peripheral surface of the sun gear.

With this configuration, the sun gear and drive worm are positioned and supported by the case, and the positioning position of the sun gear relative to the case is set on the outer peripheral surface of the sun gear, so that the radial force of the sun gear on the case acts on the outer peripheral surface that is roughly the same as the gear diameter of the sun gear.

As a result, the radial force of the sun gear does not act locally on the case, but is distributed over a wide area, so the support position of the case does not deform and the sun gear does not displace.

As long as the position where the sun gear is positioned in the case is the outer circumferential surface of the sun gear, the specific support position can be anywhere .

In addition, the vehicle visual confirmation device may be a mirror or a camera, as long as it is structured to allow the rear of the vehicle to be viewed.

The second invention is characterized in that the outer peripheral surface, which is the position where the sun gear is positioned on the case, is the outer surface of a cylindrical support part that protrudes downward from the sun gear.

With this configuration, the sun gear is positioned relative to the case on the outer surface of the cylindrical support portion that protrudes downward from the sun gear, so the sun gear is positioned relative to the case at a lower position.

This allows the meshing position of the sun gear with the drive worm to be visually observed from above without being hidden by the case.

This allows the meshing state of the sun gear and drive worm to be checked after assembly into the case, ensuring that the teeth of these gears are in the correct position.

The third invention is characterized in that a washer member that reduces frictional resistance is interposed between the outer circumferential surface of the sun gear and the support position of the case.

With this configuration, a washer member is interposed between the outer circumferential surface of the sun gear and the support position of the case, which reduces frictional resistance between the outer circumferential surface of the sun gear and the support position of the case.

As a result, even if relative displacement occurs between the sun gear and the case when the case rotates, and friction occurs between the two, the rotational resistance does not increase, and the case rotates smoothly.

Thus, by supporting the sun gear on the case, relative displacement occurs between the two when the case rotates, but because the rotational resistance can be reduced, the increase in load on the electric motor can be suppressed, preventing breakdown of the electric motor.

The fourth invention is characterized in that the washer member is composed of an annular member having a substantially L-shaped cross section and consisting of a peripheral surface portion and a bottom surface portion.

With this configuration, the washer member is an annular member with a generally L-shaped cross section consisting of a peripheral surface portion and a bottom surface portion, which reduces frictional resistance between the case and the outer peripheral surface and bottom surface of the sun gear.

As a result, the washer member acts against the radial force and thrust force (axial direction of the sun gear) that occur between the sun gear and the case when the case rotates, reducing the frictional resistance between the two.

This makes it possible to more reliably reduce the rotational resistance between the sun gear and the case, allowing the vehicle visual confirmation device to rotate more smoothly.

As explained above, according to the present invention, the radial force of the sun gear does not act locally on the case, but is distributed over a wide area, so the support position of the case does not deform and the sun gear does not displace.

Therefore, in a vehicle visual confirmation device equipped with an electric storage unit, the sun gear of the drive mechanism of the electric storage unit is supported by a case that also supports a drive worm, etc., suppressing positional variation while preventing radial forces from acting locally on the sun gear case. Even if a rotational force is applied from the electric motor, the sun gear does not displace, and the gear teeth do not change contact, causing abnormal noise, etc.

1 is an overall plan view illustrating a deployed state and a folded state of a vehicle visual confirmation device equipped with an electric storage unit according to a first embodiment of the present invention. FIG. 2 is a plan view of an electric storage unit built into the vehicle visual confirmation device according to the first embodiment. FIG. 2 is a rear view of an electric storage unit built into the vehicle visual confirmation device according to the first embodiment. FIG. 2 is an exploded perspective view of an electric storage unit built into the vehicle visual confirmation device of the first embodiment. FIG. 3 is a cross-sectional view taken along line XX in FIG. 2. FIG. 2 is a plan view of the electric storage unit with the cover and holder removed. FIG. 2 is a perspective view illustrating a drive mechanism of the electric storage unit. 7 is a cross-sectional view taken along line YY in FIG. 6. FIG.

The following describes in detail the embodiments of the present invention with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the present invention, its applications, or its uses.

(Embodiment 1)
First, the structure of a visual confirmation device for a vehicle equipped with an electric storage unit according to the present embodiment 1 will be described with reference to Figures 1 to 4. Note that the directions of the arrows shown in each figure indicate the respective directions.

The vehicle visual confirmation device 1 of this embodiment is, for example, a side mirror device 1 erected on a side door 2 of a vehicle as shown in FIG. 1, and this side mirror device 1 is provided so as to protrude from the vehicle to the side (right side). This side mirror device 1 includes a side mirror body 4 provided with a mirror surface 3, and a mirror base 5, and is erected on the side door 2 by fixing the mirror base 5 to the side door 2 with a fixing bolt 6. Although not shown, a side mirror device 1 is also erected on the side door on the opposite side of the vehicle so as to protrude from the vehicle to the side (left side).

The side mirror body 4 is mounted on the mirror base 5 via an electric storage unit U built into the side mirror body 4, and is configured to rotate between the unfolded state shown by the solid lines and the folded state shown by the dashed dotted lines by the operation of the electric storage unit U.

Figure 2 is a plan view of the aforementioned electric storage unit U as seen from above, Figure 3 is a rear view of the electric storage unit U as seen from the rear of the vehicle, and Figure 4 is an exploded perspective view of the electric storage unit U.

The aforementioned electric storage unit U includes a shaft 10 fixed to the mirror base 5, a case 20 that rotates around the shaft 10, a cover 30 that covers the internal space of the case 20 at the top of the case 20, and a holder 40 that divides the internal space of the case 20 into upper and lower sections.

The shaft 10 described above has a fastening portion 11 at its lower part that is bolted to the mirror base 5, a support receiving portion 12 at its middle part that supports the case 20 etc., and a shaft main body portion 13 at its upper part that extends upward and serves as the center of rotation for the case 20 etc.

The aforementioned case 20 comprises a case body 21 that is an irregular box-like shape with a hollow interior and an open top, three lower casing fixing parts 22 provided respectively at the lower front, lower rear and lower sides of the case body 21, two side casing fixing parts 23, 23 provided at the upper and lower positions on the vehicle sides of the case body 21, and a number of cover locking parts 24 provided around the upper periphery of the case body 21.

The aforementioned cover 30 comprises a roughly lid-shaped cover main body 31 located above the case 20, a circular opening-shaped shaft receiving portion 32 supporting the upper end of the shaft 10 on the vehicle inner side of the cover main body 21, a connection port 33 for connecting a power harness (not shown) on the vehicle lateral side (right side) of the cover main body 30, and a plurality of case engagement portions 34... that engage with cover locking portions 24... of the case 20 around the cover main body 30.

The holder 40 is installed in the internal space of the case 20 and includes a roughly rectangular motor holding section 41 that surrounds and holds the electric motor M, and a horizontally extending flat partition section 42 that divides the internal space of the case 20 into upper and lower sections. The holder 40 is also provided with a board support section 43 that supports a circuit board B that controls the rotational drive state of the electric motor M. The partition section 42 is also provided with a shaft holding section 44 with a circular opening that holds the upper end of the shaft 10. The holder 40 is fixed to the case 20 from above by three screw members 45... at its periphery.

On the other hand, a plate shaft 51, a shaft washer 52, and a plate case 53 are attached to the shaft 10 from below above the support receiving portion 12. Of these, the plate shaft 51 is fixed to the support receiving portion 12 of the shaft 10, and the plate case 53 is fixed to the bottom surface of the case 20, and the plate shaft 51 and the plate case 53 are configured to define the rotation range of the case 20, i.e., the electric storage unit U. In addition, the shaft washer 52 reduces frictional resistance between the case 20 and the shaft 10.

Furthermore, after being assembled into the case 20, the shaft 10 is fitted with a case washer 61, a sun gear 62, an upper clutch 63, a spring 64, and a spring stopper 65, in that order from the bottom. The case washer 61 is located between the sun gear 62 and the case 20 to reduce frictional resistance between the sun gear 62 and the case 20.

The sun gear 62 described above is configured to mesh with the drive worm 71 described below and receive a rotational driving force from the electric motor M, causing the case 20 to rotate around the shaft 10. However, this sun gear 62 is not fixed to the shaft 10, and is loosely fitted relative to the shaft 10.

The upper clutch 63 has a number of clutch receiving portions 63a... on its underside that fit with a number of clutch protrusions 62a... on the inner circumference of the sun gear 62, and has a number of convex ridges 63b... on its inner circumference that fit with a number of concave grooves 13a... on the shaft body 13 of the shaft 10.

The aforementioned spring 64 is made of a spiral-shaped coil spring member and applies a downward biasing force to the lower upper clutch 63.

The spring stopper 65 is fixed to the shaft body 13 by fitting the engagement portion 65a on the inner circumference into the annular locking recess 13b formed in the shaft body 13 of the shaft 10, preventing the spring 64 from falling out of the shaft body 13.

And with the upper clutch 63, spring 64, and spring stopper 65 configured in this way, a force is applied to the upper clutch 63 that pushes the sun gear 62 downward, and the sun gear 62 is fixed so that it becomes one with the shaft 10 via the upper clutch 63.

For this reason, as described below, under normal circumstances, the sun gear 62 and the shaft 10 are integrated, and when the sun gear 62 receives the rotational driving force from the electric motor M, the case 20 etc. rotate around the shaft 10, and the door mirror body 4 rotates between the unfolded state and the folded state. However, in an abnormal situation in which the side mirror body 4 receives an impact or the like, the clutch protrusion 62a of the sun gear 62 pushes up the upper clutch 63, releasing the clutch, so that the sun gear 62 and the shaft 10 separate, and the case 20 etc. rotate around the shaft 10, causing the door mirror body 4 to rotate.

In this way, in the event of an abnormality such as an impact on the side mirror body 4, the sun gear 62 and the shaft 10 can be separated, preventing failure or damage to the electric motor M or the drive mechanism K described below.

Next, the structure of the drive mechanism K of the electric storage unit U of this embodiment 1 will be described using Figures 5 to 7.

As shown in FIG. 5, the electric motor M held in the motor holding portion 41 of the holder 40 is arranged so that the motor shaft Ma extends downward. A cylindrical worm 72 is fitted into this motor shaft Ma, and as shown in FIG. 7, a disk-shaped worm wheel 73 meshes with this worm 72. The aforementioned drive worm 71 is provided coaxially with this worm wheel 73 and is configured to rotate integrally with this worm wheel 73. The drive worm 71 is configured to mesh with the aforementioned sun gear 62.

That is, as shown in FIG. 6, the drive mechanism K is configured to transmit the rotational drive force of the motor shaft Ma of the electric motor M, which extends in the vertical direction, to the sun gear 62 via the shaft of the drive worm 71, which is arranged in the horizontal direction and diagonally forward.

The shaft of the drive worm 71 is supported by bearings 25, 25 on both ends of the shaft 71a, 71a of the case 20, and is firmly supported on the case 20 by being supported at both ends.

Since the drive mechanism K of the electric storage unit U is configured in this manner, the drive worm 71 and the like rotate around the sun gear 62 in accordance with the direction of rotation of the electric motor M, causing the case 20 to rotate. As the case 20 rotates in this manner, the side mirror body 4 fixed to the case 20 rotates between the unfolded position and the folded position.

Next, the relationship between the sun gear 62, upper clutch 63, case washer 61, shaft 10, and case 20 in this embodiment 1 will be explained using Figures 8 and 9.

As mentioned above, the shaft 10 and upper clutch 63 are configured to be integrated in the rotational direction because the concave groove portion 13a... (see Figure 4) of the shaft main body 13 fits into the convex rib portion 63b... of the upper clutch 63. The sun gear 62 and upper clutch 63 are also configured to be integrated unless the clutch is released because the clutch protrusions 62a... and clutch receiving portions 63a... are engaged. Therefore, the sun gear 62 is integrated with the shaft 10 via the upper clutch 63, and because the shaft 10 is fixed to the mirror base 5 (see Figure 1), the sun gear 62 is also fixed in the rotational direction.

However, as shown in Fig. 8, a small gap s is provided between the sun gear 62 and the shaft 10, and the sun gear 62 is not supported by the shaft 10. This is because if the sun gear 62 is supported by the shaft 10, which is a separate member from the case 20 that supports the drive worm 71 of the drive mechanism K (see Fig. 6), the positional relationship between the drive worm 71 and the sun gear 62 will change, causing a change in tooth contact and generating abnormal noise.

For this reason, in this embodiment, the sun gear 62 is supported on the case 20 side via the case washer 61. By supporting the sun gear 62 on the case 20 side in this way, it can be supported on the same member (20) as the drive worm 71, so the positional relationship between the two does not change and tooth contact can be prevented from changing.

To explain the support structure of the sun gear 62 in more detail, a cylindrical support portion 62b is provided at the bottom of the sun gear 62 so as to protrude, and a case washer 61 with an L-shaped cross section is disposed on the outer periphery of the cylindrical support portion 62b, and a receiving wall portion 26 protruding upward is provided on the case 20 at the outer periphery.

The aforementioned cylindrical support portion 62b is configured so that its outer circumferential surface 62b1 has a diameter L that is slightly smaller than the gear diameter Ls of the sun gear 62, but is larger than the diameter Ln of the inner circumferential surface of the sun gear 62. The outer circumferential surface 62b1 of the cylindrical support portion 62b is formed as a smooth surface.

The case washer 61 is made of a ring-shaped hard plastic material with an L-shaped cross section, consisting of a peripheral surface portion 61a and a bottom surface portion 61b, such as a POM (polyoxymethylene) material. The peripheral surface portion 61a of the case washer 61 is configured to receive a radial load (diameter direction of the sun gear 62) acting from the cylindrical support portion 62b of the sun gear 62, and the bottom surface portion 61a of the case washer 61 is configured to receive a thrust load (axial direction of the sun gear 62) acting from the underside of the cylindrical support portion 62b of the sun gear 26.

The receiving wall portion 26 of the case 20 described above is formed at the same height as the peripheral surface portion 61a of the case washer 61, and is formed in an annular shape inside the case 20 so that the case washer 61 can be fitted inside.

In addition, by forming the receiving wall portion 26 of the case 20 into a circular ring shape, the sun gear 62 is reliably supported in the radial direction on the case 20 side via the case washer 61.

In this way, the cylindrical support portion 62b of the sun gear 62 is supported by the annular receiving wall portion 26 of the case 20, so that the load acting on the case 20 from the sun gear 62 can be supported in a wider distributed manner than when the inner peripheral surface 62c of the sun gear 62 is supported by the case 20. This makes it possible to prevent the load from acting locally on the case 20.

In other words, the sun gear 62 receives a rotational driving force from the drive worm 71 and transmits a load to the case 20 on which it is supported. However, the portion supported on the case 20 side is the outer peripheral surface 62b1 of the cylindrical support portion 62b of the sun gear 62, which is supported over a wider area than the inner peripheral surface 62c of the sun gear 62, so the load can be transmitted over a wider area that receives the load. This makes it possible to prevent the load from acting locally on the case 20.

In addition, by interposing the case washer 61 between the cylindrical support portion 61b of the sun gear 62 and the receiving wall portion 26 of the case 20, it is possible to reduce frictional resistance when relative rotation occurs between the two. This makes it possible to reduce the rotational resistance between the two.

In particular, because the case washer 61 is an annular member with an L-shaped cross section having a peripheral surface portion 61a and a bottom surface portion 61b, it is possible to reduce frictional resistance not only in the radial direction acting from the cylindrical support portion 62b of the sun gear 62, but also in the thrust direction, thereby ensuring that rotational resistance is reduced.

As described above, in this embodiment, the side mirror device 1 is provided with an electric storage unit U that is installed on the side of the vehicle and configured to rotate between an unfolded position and a folded position. The electric storage unit U includes an electric motor M provided inside the case 20 and a drive mechanism K that transmits the rotational force of the electric motor M so that the case 20 rotates around a shaft 10 provided on the vehicle side. The drive mechanism K includes a sun gear 62 that is installed in a state where its rotation is restricted around the shaft 20, and a drive worm 71 that transmits the rotational force from the electric motor M to the sun gear 62. The sun gear 62 and the drive worm 71 are configured to be positioned and supported by the case 20, and the position of the sun gear 62 relative to the case 20 is set on the outer circumferential surface 62b1 of the sun gear 62.

As a result, the radial force of the sun gear 62 on the case 20 acts on the outer peripheral surface 62b1(L), which is approximately the same as the gear diameter Ls of the sun gear 62.

As a result, the radial force of the sun gear 62 does not act locally on the case 20, but is distributed over a wide area, so the support position of the case 20 does not deform and the sun gear 62 does not displace.

Therefore, in a side mirror device 1 equipped with an electric storage unit U, the sun gear 62 of the drive mechanism K of the electric storage unit U is supported by the case 20 that also supports the drive worm 71, etc., suppressing positional variation while preventing the radial force of the sun gear 62 from acting locally on the case 20. Even if a rotational force is applied from the electric motor M, the sun gear 62 does not displace, and the gear teeth do not change, causing abnormal noise, etc.

In addition, in this embodiment, the sun gear 62 is positioned relative to the case 20 by the outer circumferential surface 62b1 of the cylindrical support portion 62b that protrudes downward from the sun gear 62.

This allows the sun gear 62 to be positioned on the case 20 at its lower position.

This allows the assembly worker to visually check the meshing position of the sun gear 62 with the drive worm 71 from above without it being hidden by the case 20.

As a result, the meshing state between the sun gear 62 and the drive worm 71 can be checked after assembly into the case 20, and the teeth of these gears can be reliably secured in the correct position.

In addition, in this embodiment, a case washer 61 that reduces frictional resistance is interposed between the outer peripheral surface 62b1 of the sun gear 62 and the support position (26) of the case 20.

This reduces the frictional resistance between the outer peripheral surface 62b1 of the sun gear 62 and the support position (26) of the case 20.

Therefore, even if relative displacement occurs between the sun gear 62 and the case 20 when the case 20 rotates and friction occurs between the two, the rotational resistance does not increase, so that the case 20 rotates smoothly.

Thus, by supporting the sun gear 62 on the case 20, a relative displacement occurs between the two when the case 20 rotates, but because the rotational resistance can be reduced, the increase in the load on the electric motor M can be suppressed, and breakdowns of the electric motor M can be prevented.

In this embodiment, the case washer 61 is composed of an annular member having a substantially L-shaped cross section, and is made up of a peripheral surface portion 61a and a bottom surface portion 61b.

This reduces frictional resistance between the outer peripheral surface 62b1 and the underside of the sun gear 62 and the case 20.

As a result, the case washer 61 acts against the radial and thrust forces that occur between the sun gear 62 and the case 20 when the case 20 rotates, reducing the frictional resistance between the two.

This makes it possible to more reliably reduce the rotational resistance between the sun gear 62 and the case 20, allowing the side mirror device 1 to rotate more smoothly.

Other Embodiments
Next, other embodiments will be described.

First, in the above embodiment, the positioning position of the sun gear 62 on the case 20 is the outer circumferential surface 62b1 of the cylindrical support portion 62b on the lower side of the sun gear 62, but this is not limited thereto, and the sun gear 62 may be positioned and supported on the case 20 by providing a smooth surface without a gear on the outer circumferential surface. For example, such a smooth surface may be provided on the upper side of the sun gear 62.

Alternatively, a cylindrical portion larger than the gear diameter Ls of the sun gear 62 may be provided, and the sun gear 62 may be positioned relative to the case 20 using this cylindrical portion.

Furthermore, the visual structure of the vehicle visual device is not limited to the mirror in the above-mentioned embodiment, but may be a camera or the like as long as it allows the rear of the vehicle to be viewed.

As described above, the present invention is useful in a vehicle visual confirmation device equipped with an electrically powered storage unit.

1...Side mirror device (vehicle visual confirmation device)
U... Electric storage unit M... Electric motor K... Drive mechanism 10... Shaft 20... Case 62... Sun gear 62b1... Outer circumferential surface 71... Drive worm

Claims (4)

A visual confirmation device for a vehicle, comprising an electric storage unit that is installed on a side of a vehicle and configured to rotate between an unfolded position and a folded position,
The electric storage unit includes an electric motor provided inside a case,
a drive mechanism that transmits the rotational force of the electric motor so that the case rotates around a shaft provided on the vehicle side,
the drive mechanism includes a sun gear that is installed around the shaft in a state in which its rotation is restricted, and a drive worm that transmits a rotational force from the electric motor to the sun gear,
The sun gear and the drive worm are positioned and supported by the case,
A smooth surface having no gears is set on the outer peripheral surface of the sun gear, and the smooth surface is set as the outer peripheral surface of the sun gear,
A visual confirmation device for a vehicle equipped with an electric storage unit, wherein a position of the sun gear in the case is set on an outer circumferential surface of the sun gear. 2. The vehicle visual confirmation device equipped with an electric storage unit according to claim 1, wherein the outer peripheral surface which is the position for positioning the sun gear in the case is the outer peripheral surface of a cylindrical support portion protruding downward from the sun gear. 3. The vehicle visual confirmation device equipped with an electric storage unit according to claim 1, wherein a washer member for reducing frictional resistance is interposed between the outer circumferential surface of the sun gear and a support position of the case. 4. The vehicle visual confirmation device equipped with an electric storage unit according to claim 3, wherein the washer member is an annular member having a substantially L-shaped cross section and including a peripheral surface portion and a bottom surface portion.

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