JP5141346B2 - In-wheel motor cooling structure - Google Patents

Description

  The present invention relates to an in-wheel motor cooling structure, and more specifically, in an in-wheel motor that cools the motor body by supplying oil to the motor body that rotates the wheel, the in-wheel that efficiently cools the motor body. The present invention relates to a motor cooling structure.

2. Description of the Related Art Conventionally, an in-wheel motor that cools the motor body by supplying oil discharged from the oil pump to the motor body by driving the oil pump with the motor body that rotates the wheel is known.
For example, it is like the technique described in Patent Document 1.

  In the in-wheel motor described in Patent Document 1, the oil discharged from the oil pump is supplied to the outer periphery of the stator core of the motor main body by driving the oil pump with the motor main body, and the motor main body is supplied with the supplied oil. It is intended to cool the motor body by absorbing the heat.

In general, the cooling of the motor body is performed by continuously circulating the oil stored in the oil reservoir between the oil reservoir and the motor body when the vehicle is running. At this time, when the oil is supplied to the motor main body, the oil rises in temperature by absorbing the heat of the motor main body, and dissipates heat until it is circulated and supplied to the motor main body again. To cool (circulate cooling).
Since the motor main body, the oil reservoir, the oil pump, and the like are provided inside the wheel, the physique of the motor main body, the oil pump, the oil reservoir, and the like is limited to fit inside the wheel.
As a result, the amount of oil that can be stored in the oil reservoir is also limited. Therefore, when the motor body is cooled as described above, the degree of temperature rise of the oil that has absorbed the heat of the motor body due to insufficient heat capacity of the oil is high. Therefore, oil that is insufficiently circulated and cooled is easily supplied to the motor body.

Further, as described above, the oil reservoir is provided inside the wheel.
For this reason, since the traveling wind does not hit the oil reservoir when the vehicle is traveling, it is difficult to expect that the oil stored in the oil reservoir is cooled by the traveling wind.

As described above, when the motor body is cooled, the amount of heat absorbed by the motor body decreases as the temperature of the oil supplied to the motor body increases. Therefore, the motor body is not sufficiently cooled and becomes overheated. It is generally known that it is easy.
When the motor main body is not sufficiently cooled, the output of the motor main body is limited to avoid the motor main body from being overheated.
JP 2005-73364 A

  In view of the situation as described above, the present invention provides an in-wheel motor cooling structure capable of efficiently cooling a motor body.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

An in-wheel motor cooling structure according to a first aspect of the present invention includes an in-wheel motor having a motor body that rotates a wheel and a first oil reservoir in which oil is stored, and a shock absorber that is provided outside the wheel and stores oil. And an oil pump that is driven by the motor body and sucks and discharges oil stored in the first oil reservoir, and is discharged from the oil pump. A first oil passage for supplying the oil to the shock absorber, a second oil passage for supplying the oil stored in the shock absorber to the motor main body, and the oil supplied to the motor main body to the first oil reservoir anda third oil passage for discharging the said shock absorber, forms the outer portion a And a second oil reservoir that is formed between the outer shell and the cylinder and that stores oil, and the first oil passage includes the oil shell. An oil passage that supplies oil discharged from the pump to the second oil reservoir, and the second oil passage is an oil passage that supplies oil stored in the second oil reservoir to the motor body.

An in-wheel motor cooling structure according to a second aspect of the invention includes an in-wheel motor having a motor body for rotating the wheel and a first oil reservoir for storing oil, and a shock absorber provided outside the wheel and storing oil. And an oil pump that is driven by the motor body and sucks and discharges oil stored in the first oil reservoir, and is discharged from the oil pump. A first oil passage for supplying the oil to the shock absorber, a second oil passage for supplying the oil stored in the shock absorber to the motor main body, and the oil supplied to the motor main body to the first oil reservoir anda third oil passage for discharging the said shock absorber, forms the outer portion a And a second oil reservoir formed between the outer shell and the cylinder and storing oil, and the outer shell includes an outer outer shell and an inner outer shell. A cooling space that is a space surrounded by the outer outer shell and the inner outer shell is formed in the outer shell, and the first oil passage is connected to the cooling space in the outer outer shell. A second communication hole is formed in the inner outer shell to connect the cooling space and the second oil reservoir.

An in-wheel motor cooling structure according to a third aspect of the present invention is the invention according to claim 2 , wherein the first communication hole is formed at a lower end portion of the cooling space, and the second communication hole is an upper end of the cooling space. Formed in the part.

An in-wheel motor cooling structure according to a fourth aspect of the present invention is an in-wheel motor having a motor body that rotates a wheel and a first oil reservoir in which oil is stored, and a shock absorber that is provided outside the wheel and stores oil. And an oil pump that is driven by the motor body and sucks and discharges oil stored in the first oil reservoir, and is discharged from the oil pump. A first oil passage for supplying the oil to the shock absorber, a second oil passage for supplying the oil stored in the shock absorber to the motor main body, and the oil supplied to the motor main body to the first oil reservoir anda third oil passage for discharging the said shock absorber, forms the outer portion a A shell, a cylinder provided inside the outer shell, a second oil reservoir formed between the outer shell and the cylinder and storing oil, and connected to the first oil passage and storing oil. A third oil reservoir, and an upper end portion of the second oil reservoir is connected to the second oil passage, and a lower end portion of the second oil reservoir is connected to the third oil reservoir via a one-way valve. And the one-way valve allows oil to flow from the third oil reservoir to the second oil reservoir but prevents backflow.

Wheel motor cooling structure of the fifth invention, the connection in the invention described in any one of claims 1 to 3, wherein the second oil passage, said second oil reservoir at a position higher than a predetermined height Is done.

  The present invention has an effect that the motor body can be efficiently cooled.

[First embodiment]
Below, the in-wheel motor cooling structure 1 which is 1st embodiment of the in-wheel motor cooling structure which concerns on this invention using FIG. 1 and FIG. 2 is demonstrated.
In the drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated.

  As shown in FIG. 1, the in-wheel motor cooling structure 1 is configured between an in-wheel motor 100 and a shock absorber 200.

  Below, the in-wheel motor 100 is demonstrated.

The in-wheel motor 100 is a drive source for the wheel 700.
The in-wheel motor 100 is provided inside the wheel 700.
The inside of the wheel 700 indicates a space surrounded by the rim inner peripheral surface of the wheel 700.
The entire in-wheel motor 100 does not have to be provided inside the wheel 700, and a configuration in which a part of the in-wheel motor 100 protrudes from the inside of the wheel 700 may be employed.

The in-wheel motor 100 includes a housing 110, a driving device, and a first oil supply device.
The housing 110 is a member that forms a main structure of the in-wheel motor 100.
The drive device and the first oil supply device are provided inside the housing 110.

  Below, the said drive device is demonstrated.

  The drive device rotates the wheel 700 and includes a motor main body 121, a shaft 122, and a speed reducer 123.

The motor main body 121 is a main part that functions as a drive source of the wheel 700 in the in-wheel motor 100.
The motor body 121 includes a motor case 12a, a stator core 12b, a stator coil 12c, a rotor 12d, and a cooling jacket 12e.
The motor case 12 a is a member that forms a main structure of the motor body 121.
A stator core 12b, a stator coil 12c, and a rotor 12d are provided inside the motor case 12a.
The cooling jacket 12e is provided so as to cover the outer periphery of the motor case 12a.
The motor body 121 is rotated by an inverter (not shown) (specifically, a three-phase alternating current is supplied to the stator coil 12c by the inverter to form a rotating magnetic field, and the rotor 12d having a permanent magnet is attracted to the rotating magnetic field. A rotating synchronous motor.

  The shaft 122 is connected to the rotor 12d, and rotates when the rotation of the motor body 121 (rotation of the rotor 12d) is transmitted.

The speed reducer 123 decelerates and outputs the input driving force.
The speed reducer 123 includes a gear group (an assembly of a plurality of gears) to which driving force is input and a drive shaft 12f connected to the output side of the gear group.
The shaft 122 is connected to the input side of the gear group. That is, the shaft 122 is connected to the drive shaft 12f through the gear group.
The drive shaft 12f is attached to a hub (not shown), and the hub is attached to the wheel 700.

The rotation of the motor body 121 is transmitted to the speed reducer 123 via the shaft 122 and is decelerated at a predetermined reduction ratio by the gear group of the speed reducer 123.
The rotation of the motor body 121 decelerated by the gear group is output from the drive shaft 12f and transmitted to the wheel 700 through the hub. Thereby, the wheel 700 rotates.

  In addition, this invention does not specifically limit about the structure of a motor main body, or the structure of a reduction gear.

  Hereinafter, the first oil supply device will be described.

The first oil supply device supplies oil to the drive devices (the motor main body 121 and the speed reducer 123).
The first oil supply device includes a first oil reservoir 131, an oil pump 132, a first oil passage 133, a second oil passage 134, a third oil passage 135, a fourth oil passage 136, and a fifth oil passage 137. .

  The first oil reservoir 131 stores oil used for lubricating and cooling the motor body 121, the speed reducer 123, and the like.

The oil pump 132 sucks and discharges oil stored in the first oil reservoir 131.
An input shaft (rotary shaft) of the oil pump 132 is connected to the shaft 122 so as not to rotate.
The rotation of the motor body 121 is transmitted to the oil pump 132 via the shaft 122 to drive the oil pump 132.
The oil pump 132 communicates with the first oil reservoir 131, and sucks and discharges oil stored in the first oil reservoir 131 when the motor main body 121 rotates and the oil pump 132 is driven.

  Note that the input shaft of the oil pump 132 may be integrated with the shaft 122.

  Further, the present invention is not particularly limited as long as the oil pump is driven by utilizing the rotation of the motor body.

  The first oil passage 133 communicates with the oil pump 132 and a second oil reservoir 230 described later, and a part of the oil discharged from the oil pump 132 is conveyed inside the first oil passage 133 to be sent to the second oil reservoir 230. To be supplied.

  The second oil passage 134 communicates the second oil reservoir 230 and the cooling jacket 12e, and the oil stored in the second oil reservoir 230 is conveyed through the second oil passage 134 and supplied to the cooling jacket 12e.

  The third oil passage 135 communicates the cooling jacket 12 e and the first oil reservoir 131, and the oil supplied to the cooling jacket 12 e is transported inside the third oil passage 135 and discharged to the first oil reservoir 131.

The fourth oil passage 136 is formed in the shaft 122, and the remaining oil discharged from the oil pump 132 is conveyed through the fourth oil passage 136 and supplied to the speed reducer 123.
One end of the fourth oil passage 136 opens on the outer peripheral surface of the shaft 122 at a position where oil discharged from the oil pump 132 can flow into the fourth oil passage 136 and forms an inlet.
The other end of the fourth oil passage 136 is on the outer peripheral surface of the shaft 122, and the oil inside the fourth oil passage 136 is transferred to the speed reducer 123 (gear group of the speed reducer 123) by the centrifugal force of the shaft 122 rotated by the motor body 121. It opens to a position where it can be discharged and forms a discharge port.
The remainder of the oil discharged from the oil pump 132 flows into the fourth oil passage 136 through the inlet, and is then discharged from the discharge port by the centrifugal force of the shaft 122 rotated by the motor body 121 to be reduced. 123.
Thereby, the reduction gear 123 is lubricated.

  The fifth oil passage 137 connects the speed reducer 123 and the first oil reservoir 131, and the oil supplied to the speed reducer 123 is transported through the fifth oil path 137 and discharged to the first oil reservoir 131.

  Hereinafter, the shock absorber 200 will be described.

The shock absorber 200 mitigates vibrations and shocks that occur when the vehicle is traveling.
As shown in FIG. 1, the shock absorber 200 includes an outer shell 210, a cylinder 220, and a second oil reservoir 230.
The shock absorber 200 is provided outside the wheel 700.
The shock absorber 200 is interposed between the vehicle body and a lower arm (not shown).

The outer shell 210 forms an outer portion of the shock absorber 200.
A housing 110 of the in-wheel motor 100 is attached to the outer shell 210, so that the shock absorber 200 supports the in-wheel motor 100.

The cylinder 220 is filled with oil.
The cylinder 220 is provided inside the outer shell 210.
An annular rod guide 240 is provided between the outer periphery of the upper end portion of the cylinder 220 and the inner periphery of the upper end portion of the outer shell 210.
A cylindrical piston rod 250 is inserted into the cylinder 220 from its upper end portion through a rod guide 240 so as to be able to enter and leave in a liquid-tight manner.

The upper end of the piston rod 250 is attached to the vehicle body.
An annular piston 260 is attached to the outer periphery of the lower end of the piston rod 250, and the piston rod 250 and the piston 260 are displaced together.

  The piston 260 is provided on the inner peripheral surface of the cylinder 220 in a liquid-tight and slidable manner, and divides the inside of the cylinder 220 into an upper chamber 221 and a lower chamber 222.

The piston 260 is formed with a communication path 261 and a communication path 262 that connect the upper chamber 221 and the lower chamber 222.
A one-way valve (check valve) 26 a is provided in the middle of the communication path 261.
The one-way valve 26a allows oil to flow from the lower chamber 222 to the upper chamber 221 but prevents its backflow.
In the middle of the communication path 262, a pressure regulating valve 26b is provided.
The pressure regulating valve 26b allows oil to flow from the upper chamber 221 to the lower chamber 222 when the hydraulic pressure in the upper chamber 221 is equal to or higher than a predetermined value. The pressure regulating valve 26 b prevents oil from flowing from the lower chamber 222 to the upper chamber 221.

The second oil reservoir 230 is formed between the outer shell 210 and the cylinder 220.
A part of the second oil reservoir 230 is filled with oil, and the remaining part is filled with a gas such as air or nitrogen.

A base valve 270 is provided between the cylinder 220 and the second oil reservoir 230.
The base valve 270 is formed with a communication path 271 and a communication path 272 that communicate the lower chamber 222 and the second oil reservoir 230.
A one-way valve 27 a is provided in the middle of the communication path 271.
The one-way valve 27a allows the oil to flow from the second oil reservoir 230 to the lower chamber 222 but prevents its backflow.
In the middle of the communication path 272, a pressure regulating valve 27b is provided.
The pressure regulating valve 27b allows oil to flow from the lower chamber 222 to the second oil reservoir 230 when the hydraulic pressure in the lower chamber 222 is equal to or greater than a predetermined value. Further, the pressure regulating valve 26 b prevents oil from flowing from the second oil reservoir 230 to the lower chamber 222.

  Hereinafter, the oil circulation path will be described.

As shown in FIG. 2, when the vehicle is traveling (when the motor main body 121 is rotating), the oil stored in the first oil reservoir 131 by driving the oil pump 132 is sucked by the oil pump 132. Discharged.
Part of the oil discharged by the oil pump 132 is supplied to the second oil reservoir 230 via the first oil passage 133.
The oil stored in the second oil reservoir 230 is supplied to the cooling jacket 12 e via the second oil passage 134 and then discharged to the first oil reservoir 131 via the third oil passage 135.
The remainder of the oil discharged by the oil pump 132 is supplied to the speed reducer 123 via the fourth oil path 136 and then discharged to the first oil reservoir 131 via the fifth oil path 137.
Oil discharged to the first oil reservoir 131 via the third oil passage 135 and the fifth oil passage 137 is sucked and discharged again by the oil pump 132.
As described above, the oil is circulated.
When the vehicle is running, this oil circulation is repeated.

As shown in FIG. 1, when the piston rod 250 enters the inside of the cylinder 220, the piston 260 is lowered and the oil inside the lower chamber 222 is supplied to the second oil reservoir 230 via the communication path 272. The
Then, the same amount of oil as that supplied from the lower chamber 222 to the second oil reservoir 230 is supplied from the second oil reservoir 230 to the cooling jacket 12 e via the second oil passage 134.
Thereby, a change in the amount of oil stored in the second oil reservoir 230 due to the piston rod 250 entering the cylinder 220 is compensated.

When the piston rod 250 retreats from the inside of the cylinder 220, the piston 260 rises and the oil stored in the second oil reservoir 230 is supplied to the lower chamber 222 via the communication path 271.
Then, the same amount of oil as that supplied from the second oil reservoir 230 to the lower chamber 222 is supplied from the oil pump 132 to the second oil reservoir 230 via the first oil passage 133.
Thereby, a change in the amount of oil stored in the second oil reservoir 230 due to the withdrawal of the piston rod 250 from the inside of the cylinder 220 is compensated.

  Below, cooling of the motor main body 121 is demonstrated.

The main heat source of the motor main body 121 is a stator coil 12c. The stator coil 12c is energized to generate heat, and this heat is transmitted from the stator coil 12c to the motor case 12a.
The oil supplied to the cooling jacket 12e through the second oil passage 134 absorbs the heat of the motor body 121 (motor case 12a).
The oil heated up by absorbing the heat of the motor main body 121 is cooled (circulated and cooled) by radiating heat until it is circulated and supplied to the cooling jacket 12e again.
As described above, when the vehicle is running, oil circulation is repeated between the first oil reservoir 131, the cooling jacket 12e, and the like. Circulation cooling is repeatedly performed, whereby the motor main body 121 is cooled.
Note that the lower the temperature of the oil supplied to the cooling jacket 12e, the more oil can absorb the heat of the motor body 121, so the motor body 121 is further cooled.
As described above, the motor main body 121 is cooled.

As described above, the in-wheel motor cooling structure 1 includes the in-wheel motor 100 having the motor main body 121 that rotates the wheel 700 and the first oil reservoir 131 that stores oil, and is provided outside the wheel 700 and the oil is stored in the in-wheel motor cooling structure 1. An in-wheel motor cooling structure 1 configured between a shock absorber 200 and a stored oil absorber 132 that is driven by a motor body 121 and sucks and discharges oil stored in a first oil reservoir 131. A first oil passage 133 that supplies oil discharged from the oil pump 132 to the shock absorber 200 (specifically, the second oil reservoir 230), and oil that is stored in the shock absorber 200 is supplied to the motor main body 121. Supplied to the second oil passage 134 and the motor body 121. It has a third oil passage 135 for discharging oil in the first oil reservoir 131.
According to this, the shock absorber 200 is provided outside the wheel 700, and when the vehicle is traveling, the traveling wind hits, so the oil stored in the shock absorber 200 is cooled by the traveling wind.
Therefore, low temperature oil cooled by the traveling wind can be supplied to the cooling jacket 12e, and the motor main body 121 can be efficiently cooled.

The shock absorber 200 includes an outer shell 210 that forms an outer shell, a cylinder 220 that is provided inside the outer shell 210, and a second oil reservoir 230 that is formed between the outer shell 210 and the cylinder 220 and stores oil. The first oil passage 133 is an oil passage for supplying the oil discharged from the oil pump 132 to the second oil reservoir 230, and the second oil passage 134 is stored in the second oil reservoir 230. The oil passage supplies oil to the motor main body 121.
According to this, when the oil pump 132 is driven, the oil stored in the first oil reservoir 131 and the second oil reservoir 230 passes through the first oil passage 133, the second oil passage 134, etc., and the oil pump 132, the cooling jacket 12e. Circulate between etc.
Thus, when the oil in the first oil reservoir 131 and the oil in the second oil reservoir 230 are shared as circulating oil, the oil that circulates compared to when only the oil stored in the first oil reservoir 131 circulates. The quantity increases and the heat capacity of the oil increases.
Therefore, when the oil absorbs the heat of the motor main body 121, the temperature does not easily rise, so that low temperature oil can be supplied to the cooling jacket 12e, and the motor main body 121 can be efficiently cooled.

[Second Embodiment]
Below, the in-wheel motor cooling structure 2 which is 2nd embodiment of the in-wheel motor cooling structure which concerns on this invention using FIG. 3 is demonstrated.

  As shown in FIG. 3, the in-wheel motor cooling structure 2 is configured between the in-wheel motor 300 and the shock absorber 400.

The in-wheel motor 300 includes a second oil supply device.
The second oil supply device includes a first oil passage 333.
The first oil passage 333 has one end connected to the oil pump 132 and the other end connected to a first through hole 41a described later.
The oil discharged from the oil pump 132 is transported inside the first oil passage 333, and then supplied to a cooling space 413, which will be described later, through the first through hole 41a.

The shock absorber 400 includes an outer shell 410.
The outer shell 410 forms an outer portion of the shock absorber 400.

The outer shell 410 is formed in a double structure including an outer outer shell 411 and an inner outer shell 412.
The outer shell 410 is formed with a cooling space 413 that is a space surrounded and sealed by the outer outer shell 411 and the inner outer shell 412.

The outer outer shell 411 is formed with a first communication hole 41a, and the first oil passage 333 and the cooling space 413 are connected by the first communication hole 41a. Thereby, the oil conveyed through the inside of the first oil passage 333 is supplied to the cooling space 413 through the first through hole 41a.
A second communication hole 42a is formed in the inner outer shell 412, and the cooling space 413 and the second oil reservoir 230 are communicated with each other through the second communication hole 42a. As a result, the oil supplied from the first oil passage 333 to the cooling space 413 is supplied to the second oil reservoir 230 through the second communication hole 42a.
That is, the cooling space 413 is formed between the outer outer shell 411 and the inner outer shell 412, and the lower end thereof is closed with respect to the second oil reservoir 230, and the upper end thereof is formed by the second communication hole 42a. The space is open to the second oil reservoir 230.

The first series through holes 41a are formed at the lower end of the cooling space 413, and the oil conveyed through the first oil passage 333 is supplied to the lower end of the cooling space 413 through the first through holes 41a. The
The second communication hole 42a is formed at the upper end portion of the inner outer shell 412, and the oil supplied to the lower end portion of the cooling space 413 through the first communication hole 41a is the upper end portion of the cooling space 413 (the upper end portion of the inner outer shell 412). ) And then supplied to the second oil reservoir 230 through the second communication hole 42a.

  Regarding the oil circulation path, among the oil circulation paths in the first embodiment, the path of the oil pump 132 → the first oil path 133 → the second oil reservoir 230 is the oil pump 132 → the first oil path 333 → the cooling. Except for the point that the space 413 is changed to the second oil reservoir 230, it is the same as that of the first embodiment (see FIG. 2).

As described above, the shock absorber 400 includes the outer shell 410 that forms the outer portion, the cylinder 220 that is provided inside the outer shell 410, and the second oil that is formed between the outer shell 410 and the cylinder 220 and stores oil. The outer shell 410 is formed in a double structure including an outer outer shell 411 and an inner outer shell 412, and the outer shell 410 is a cooling space that is a space surrounded by the outer outer shell 411 and the inner outer shell 412. 413 is formed, and the outer shell 411 is provided with a first series of through holes 41a that connect the first oil passage 333 to the cooling space 413 and supply the oil conveyed through the first oil passage 333 to the cooling space 413. The inner outer shell 412 is formed with a cooling space 413. It communicates the second oil reservoir 230, the second communicating hole 42a for supplying supplied to the cooling space 413 oil in the second oil reservoir 230 is formed.
According to this, when the oil is conveyed through the cooling space 413 (between flowing in from the first through hole 41a and flowing out from the second communicating hole 42a), the oil is conveyed along the outer outer shell 411 in contact with the outside air. Heat is dissipated through the outer outer shell 411.
Therefore, low temperature oil can be supplied to the cooling jacket 12e, and the motor main body 121 can be efficiently cooled.

Further, the first communication hole 41 a is formed at the lower end portion of the cooling space 413, and the second communication hole 42 a is formed at the upper end portion of the cooling space 413.
According to this, the oil supplied to the lower end portion of the cooling space 413 is transported upward through the cooling space 413 to the upper end portion of the cooling space 413, and then the second oil is passed through the second communication hole 42a. It is supplied to the oil reservoir 230.
As described above, when the oil conveyance path in the cooling space 413 is brought to the upper end portion of the cooling space 413, the oil supplied to the lower end portion of the cooling space 413 passes through the outer outer shell 411 until it reaches the upper end portion of the cooling space 413. Continue to dissipate heat through.
Therefore, low temperature oil can be supplied to the cooling jacket 12e, and the motor main body 121 can be efficiently cooled.

In the first embodiment and the second embodiment, the second oil passage 134 and the second oil reservoir 230 may be connected at a position higher than a predetermined height.
This predetermined height is determined as follows.
When the vehicle is traveling, when the piston rod 250 enters the inside of the cylinder 220 and the oil in the lower chamber 222 is supplied to the second oil reservoir 230 via the communication path 272, the vehicle travels normally. Then, let X be the amount of oil (volume of oil) when the amount of oil supplied to the second oil reservoir 230 becomes maximum.
When the vehicle is traveling, when the piston rod 250 retreats from the inside of the cylinder 220 and the oil stored in the second oil reservoir 230 is supplied to the lower chamber 222 via the communication path 271, Let Y be the amount of oil when traveling and the amount of oil supplied to the lower chamber 222 is maximized.
The predetermined height is the oil level (the height from the lower end of the second oil reservoir 230 to the oil level) when the oil amount of the sum of X and Y (X + Y) is stored in the second oil reservoir 230. That is.
As described above, the predetermined height is determined.

When the oil level of the oil stored in the second oil reservoir 230 is lower than the connection position between the second oil passage 134 and the second oil reservoir 230, the oil stored in the second oil reservoir 230 is stored in the second oil passage 134. Does not flow inside.
When the second oil passage 134 and the second oil reservoir 230 are connected at a position higher than the predetermined height described above, the amount of oil supplied to the second oil reservoir 230 is maximized due to the displacement of the piston rod 250 while traveling normally. Even when the second oil reservoir 230 is reached, at least the oil amount Y is stored.
Immediately after that, even if the piston rod 250 is displaced and the oil stored in the second oil reservoir 230 is supplied to the lower chamber 222, at least the oil amount Y can be supplied to the lower chamber 222. The supply of the gas in the reservoir 230 is prevented.
Therefore, when the motor main body 121 is being cooled (when the vehicle is traveling), it is possible to prevent gas from being supplied to the cylinder 220 (lower chamber 222) of the shock absorber 400 and impairing the riding comfort of the vehicle. .

[Third embodiment]
Below, the in-wheel motor cooling structure 3 which is 3rd embodiment of the in-wheel motor cooling structure which concerns on this invention using FIG. 4 is demonstrated.

  As shown in FIG. 4, the in-wheel motor cooling structure 3 is configured between the in-wheel motor 500 and the shock absorber 600.

The in-wheel motor 500 includes a third oil supply device.
The third oil supply device includes a first oil passage 533 and a second oil passage 534.
The first oil passage 533 has one end connected to the oil pump 132 and the other end connected to a third oil reservoir 680 described later.
The second oil passage 534 has one end connected to the upper end of the second oil reservoir 630 and the other end connected to the cooling jacket 12e.

  The shock absorber 600 includes a second oil reservoir 630, a base valve 670 and a third oil reservoir 680.

The second oil reservoir 630 is provided between the outer shell 210 and the cylinder 220.
The second oil reservoir 630 is entirely filled with oil.
The upper end portion of the second oil reservoir 630 is connected to the second oil passage 534.

  Base valve 670 is provided on the outer periphery of the lower end of cylinder 220 and second oil reservoir 630.

The third oil reservoir 680 is provided between the base valve 670 and the outer shell 210.
The third oil reservoir 680 is entirely filled with oil.
The third oil reservoir 680 is connected to the first oil passage 533.

The base valve 670 is formed with a communication path 671 and a communication path 672 that connect the lower chamber 222 and the third oil reservoir 680.
A one-way valve 67a is provided in the middle of the communication path 671.
The one-way valve 67a allows the oil to flow from the third oil reservoir 680 to the lower chamber 222 but prevents its backflow.
In the middle of the communication path 672, a pressure regulating valve 67b is provided.
The pressure regulating valve 67b allows oil to flow from the lower chamber 222 to the third oil reservoir 680 when the hydraulic pressure in the lower chamber 222 is equal to or higher than a predetermined value. Further, the pressure regulating valve 66b prevents oil from flowing from the third oil reservoir 680 to the lower chamber 222.

The base valve 670 is provided with a communication passage 673 that communicates the lower end of the second oil reservoir 630 and the third oil reservoir 680.
A one-way valve 67 c is provided in the middle of the communication path 673.
The one-way valve 67c allows oil to flow from the third oil reservoir 680 to the second oil reservoir 630 but prevents its backflow.

  Regarding the oil circulation path, among the oil circulation paths in the first embodiment, the oil pump 132 → the first oil path 133 → the second oil reservoir 230 → the second oil path 134 → the cooling jacket 12e is the oil circulation path. Except for the point changed to pump 132 → first oil passage 533 → third oil reservoir 680 → communication passage 673 → second oil reservoir 630 → second oil passage 534 → cooling jacket 12e, it is the same as that of the first embodiment. The same applies (see FIG. 2).

As shown in FIG. 4, when the piston rod 250 enters the inside of the cylinder 220, the piston 260 is lowered and the oil inside the lower chamber 222 is supplied to the third oil reservoir 680 through the communication path 672. The
Then, the same amount of oil as that supplied from the lower chamber 222 to the third oil reservoir 680 is supplied from the third oil reservoir 680 to the second oil reservoir 630 via the communication path 673.
The same amount of oil as that supplied from the third oil reservoir 680 to the second oil reservoir 630 is supplied from the second oil reservoir 630 to the cooling jacket 12e via the second oil passage 534.
Thereby, a change in the amount of oil stored in the second oil reservoir 630 and the third oil reservoir 680 accompanying the piston rod 250 entering the cylinder 220 is compensated.

Further, when the piston rod 250 retreats from the inside of the cylinder 220, the piston 260 rises and the oil stored in the third oil reservoir 680 is supplied to the lower chamber 222 via the communication path 671.
Then, the same amount of oil as that supplied from the third oil reservoir 680 to the lower chamber 222 is supplied from the oil pump 132 to the third oil reservoir 680 through the first oil passage 533.
Thereby, a change in the amount of oil stored in the third oil reservoir 680 accompanying the withdrawal of the piston rod 250 from the cylinder 220 is compensated.

As described above, the shock absorber 600 includes the outer shell 210 that forms the outer shell portion, the cylinder 220 provided in the outer shell 210, and the second oil that is formed between the outer shell 210 and the cylinder 220 and stores oil. It has a reservoir 630 and a third oil reservoir 680 that is connected to the first oil passage 533 and stores oil, and an upper end portion of the second oil reservoir 630 is connected to the second oil passage 534 and is connected to the second oil passage 534. The lower end of the reservoir 630 is communicated with the third oil reservoir 680 via the one-way valve 67c, and the one-way valve 67c allows oil to flow from the third oil reservoir 680 to the second oil reservoir 630. Prevent backflow.
According to this, when the oil is conveyed through the second oil reservoir 630, it is conveyed from the lower end of the second oil reservoir 630 toward the upper end along the outer shell 210 in contact with the outside air, and during this time, heat is transferred via the outer shell 210. Continue to dissipate.
The oil supplied to the second oil reservoir 630 is prevented from flowing back to the third oil reservoir 680 by the one-way valve 67c.
In addition, since the second oil reservoir 630 is entirely filled with oil and does not have a gas phase, the thermal conductivity is better and the oil cooling effect is greater than that of the one having the gas phase.
Therefore, low temperature oil can be supplied to the cooling jacket 12e, and the motor main body 121 can be efficiently cooled.

  In the first embodiment, the second embodiment, and the third embodiment, the housing 110 of the in-wheel motor 100, 300, 500 and the outer shell 210, 410 of the shock absorber 200, 400, 600 are attached. The invention is not limited to this, and the in-wheel motor and the shock absorber may be arranged separately.

  In addition, the place where oil is supplied when supplying oil to the motor body is supplied to the cooling jacket 12e in the first embodiment, the second embodiment, and the third embodiment, but the present invention is not limited to this. Any place where oil can absorb the heat of the motor body is acceptable. For example, oil may be supplied to the inside of the motor case (such as a stator coil).

The schematic block diagram which shows 1st embodiment of the in-wheel motor cooling structure which concerns on this invention. The block diagram which shows the circulation path | route of the oil in the in-wheel motor cooling structure shown in FIG. The schematic block diagram which shows 2nd embodiment of the in-wheel motor cooling structure which concerns on this invention. The schematic block diagram which shows 3rd embodiment of the in-wheel motor cooling structure which concerns on this invention.

1 ・ 2 ・ 3 In-wheel motor cooling structure 41a First serial hole 42a Second communication hole 26a ・ 27a ・ 67a ・ 67c One-way valve 100 ・ 300 ・ 500 In-wheel motor 121 Motor main body 131 First oil reservoir 132 Oil pump 133, 333, 533 First oil path 134, 534 Second oil path 135 Third oil path 200, 400, 600 Shock absorber 210, 410 Outer shell 220 Cylinder 230, 630 Second oil reservoir 411 Outer outer shell 412 Inner outer shell 413 Cooling space 680 3rd oil reservoir 700 wheel

Claims (5)

An in-wheel motor having a motor body for rotating the wheel and a first oil reservoir in which oil is stored;
A shock absorber provided outside the wheel and storing oil;
An in-wheel motor cooling structure configured between
An oil pump driven by the motor body and sucking and discharging oil stored in the first oil reservoir;
A first oil passage for supplying oil discharged from the oil pump to the shock absorber;
A second oil passage for supplying oil stored in the shock absorber to the motor body;
A third oil passage for discharging the oil supplied to the motor body to the first oil reservoir;
I have a,
The shock absorber is
An outer shell forming an outer part,
A cylinder provided inside the outer shell;
A second oil reservoir formed between the outer shell and the cylinder and storing oil;
Have
The first oil passage is an oil passage that supplies oil discharged from the oil pump to the second oil reservoir,
The in-wheel motor cooling structure, wherein the second oil passage is an oil passage that supplies oil stored in the second oil reservoir to the motor body . An in-wheel motor having a motor body for rotating the wheel and a first oil reservoir in which oil is stored;
A shock absorber provided outside the wheel and storing oil;
An in-wheel motor cooling structure configured between
An oil pump driven by the motor body and sucking and discharging oil stored in the first oil reservoir;
A first oil passage for supplying oil discharged from the oil pump to the shock absorber;
A second oil passage for supplying oil stored in the shock absorber to the motor body;
A third oil passage for discharging the oil supplied to the motor body to the first oil reservoir;
Have
The shock absorber is
An outer shell forming an outer part,
A cylinder provided inside the outer shell;
A second oil reservoir formed between the outer shell and the cylinder and storing oil;
Have
The outer shell is formed in a double structure consisting of an outer outer shell and an inner outer shell,
In the outer shell, a cooling space which is a space surrounded by the outer outer shell and the inner outer shell is formed,
The outer outer shell is formed with a first series of holes that connect the first oil passage to the cooling space,
An in-wheel motor cooling structure in which a second communication hole that connects the cooling space and the second oil reservoir is formed in the inner outer shell. The first through hole is formed at a lower end of the cooling space,
The in-wheel motor cooling structure according to claim 2, wherein the second communication hole is formed at an upper end portion of the cooling space. An in-wheel motor having a motor body for rotating the wheel and a first oil reservoir in which oil is stored;
A shock absorber provided outside the wheel and storing oil;
An in-wheel motor cooling structure configured between
An oil pump driven by the motor body and sucking and discharging oil stored in the first oil reservoir;
A first oil passage for supplying oil discharged from the oil pump to the shock absorber;
A second oil passage for supplying oil stored in the shock absorber to the motor body;
A third oil passage for discharging the oil supplied to the motor body to the first oil reservoir;
Have
The shock absorber is
An outer shell forming an outer part,
A cylinder provided inside the outer shell;
A second oil reservoir formed between the outer shell and the cylinder and storing oil;
A third oil reservoir connected to the first oil passage and storing oil;
The upper end of the second oil reservoir is connected to the second oil passage,
The lower end of the second oil reservoir is communicated with the third oil reservoir via a one-way valve,
The one-way valve is an in-wheel motor cooling structure that allows oil to flow from the third oil reservoir to the second oil reservoir but prevents backflow thereof. The in-wheel motor cooling structure according to any one of claims 1 to 3, wherein the second oil passage is connected to the second oil reservoir at a position higher than a predetermined height.

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