WO2019187476A1

WO2019187476A1 - Electric pump and saddle-type electric vehicle

Info

Publication number: WO2019187476A1
Application number: PCT/JP2019/000293
Authority: WO
Inventors: 良久保田
Original assignee: 本田技研工業株式会社
Priority date: 2018-03-30
Filing date: 2019-01-09
Publication date: 2019-10-03
Also published as: JP6898514B2; DE112019001715T5; JPWO2019187476A1

Abstract

One aspect of the present invention relates to an electric pump, and the electric pump is provided with: a first pump chamber that pumps a first cooling medium using a first rotor; a second pump chamber that is disposed in parallel with the first pump chamber in the axial direction of the axis of rotation of the first rotor and that pumps a second cooling medium using a second rotor having an axis of rotation which is coaxial with the axis of rotation of the first rotor; a power chamber that is disposed in parallel with the second pump chamber in the axial direction and that is provided with an electric motor that can supply power to both the first and second rotors using a shared shaft; and a heat exchanger that is disposed between the first and second pump chambers and that exchanges heat between the first and second cooling medium. Consequently, cooling efficiency can be improved with a relatively simple configuration in an electric pump provided with pump chambers of two types.

Description

Electric pump and saddle-type electric vehicle

The present invention mainly relates to an on-vehicle electric pump.

Patent Document 1 describes the configuration of an on-vehicle electric pump provided with two types of pump chambers, a water pump chamber and an oil pump chamber. An impeller for pumping water is provided in the water pump chamber. The oil pump chamber is provided with an inner rotor and an outer rotor for pumping oil. A motor chamber in which an electric motor is arranged is provided between the water pump chamber and the oil pump chamber, and the electric motor drives the impeller and the inner rotor by a common shaft. According to Patent Document 1, an electric pump in which two types of pump chambers are unitized is realized with a relatively compact configuration.

JP 2013-199844 A

By the way, it is conceivable to perform water cooling and oil cooling using water and oil as cooling media, respectively. Therefore, the electric pump of Patent Document 1 has room for improvement in the structure in consideration of heat exchange of the cooling medium in order to improve the cooling efficiency.

An object of the present invention is to achieve an improvement in cooling efficiency with a relatively simple configuration in an electric pump including two types of pump chambers.

One aspect of the present invention relates to an electric pump, and the electric pump includes: a first pump chamber that pumps a first cooling medium using a first rotating body; and a rotating shaft of the first rotating body. A second pump chamber that is arranged in parallel with the first pump chamber in the axial direction and that pumps a second cooling medium using a second rotating body having a rotating shaft coaxially with the rotating shaft; A power chamber provided in parallel with the second pump chamber in a direction and provided with an electric motor capable of supplying power to both the first and second rotating bodies using a common shaft; And a heat exchanger which is provided between the second pump chamber and performs heat exchange between the first cooling medium and the second cooling medium.

Other features and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings. In the accompanying drawings, the same or similar components are denoted by the same reference numerals.

According to the present invention, cooling efficiency can be improved in the electric pump.

The accompanying drawings are included in the specification, constitute a part thereof, show an embodiment of the present invention, and are used to explain the principle of the present invention together with the description.
It is a left side view for explaining an example of a configuration of a saddle riding type electric vehicle (electric motorcycle). It is a block diagram for demonstrating an example of a structure of a saddle-ride type electric vehicle. It is sectional drawing for demonstrating an example of the internal structure of an electric pump (electric pump unit). It is sectional drawing for demonstrating an example of the structure of a heat exchanger. It is a block diagram for demonstrating the other example of a structure of a saddle-ride type electric vehicle. It is sectional drawing for demonstrating the other example of the internal structure of an electric pump.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Each drawing is a schematic diagram showing the structure or configuration of the embodiment, and the dimensions of each member shown in the drawings do not necessarily reflect actual ones. Moreover, in each figure, the same reference number is attached | subjected to the same member or the same component, and description is abbreviate | omitted about the overlapping content hereafter.

FIG. 1 is a left side view of a saddle riding type electric vehicle (electric motorcycle) 1 according to the embodiment. The straddle-type electric vehicle 1 is a vehicle of a type in which a rider (driver) drives over a vehicle body 10, and in this embodiment, includes a seat SH on which a rider can sit, a front wheel FW, and a rear wheel RW. Motorcycle.

The straddle-type electric vehicle 1 further includes a head pipe 191, a main frame 192, a down frame 193, a seat rail 194, a pivot frame 195, and a swing arm 196 in the vehicle body 10. Although FIG. 1 is not shown because it is a right side view, in the present embodiment, the main frame 192, the down frame 193, the seat rail 194, the pivot frame 195, and the swing arm 196 are provided in a pair on the left and right. As another embodiment, the main frame 192, the down frame 193, and the seat rail 194 may be single (not necessarily a pair of left and right). The frames 192 to 195 may be collectively expressed as a body frame or the like.

The head pipe 191 is disposed in front of the vehicle body 10 so as to rotatably support the handle bar, and the rider performs steering operation by changing the direction of the front wheel FW via the front fork by rotating the handle bar. be able to.

The pair of left and right main frames 192 extend from the head pipe 191 in the longitudinal direction of the vehicle body while being separated from each other in the left and right directions. In the present embodiment, the main frame 192 includes an upper frame portion 1921 and a lower frame portion 1922. In the present embodiment, a truss frame (reinforcing material) is installed between the upper frame portion 1921 and the lower frame portion 1922 in order to improve the strength of the main frame 192.

In this embodiment, the down frame 193 extends from the front portion of the lower frame portion 1922 toward the lower rear. As another embodiment, the down frame 193 may extend from the head pipe 191 downward and rearward. The down frame 193 extends downward and rearward and then extends rearward (to a pivot frame 195 described later) so that various vehicle components in the vehicle body 10 can be held.

The seat rail 194 extends rearward from the rear portion of the main frame 192 and supports a load applied to the seat SH. In the present embodiment, the seat rail 194 includes an upper frame portion 1941 and a lower frame portion 1942. Although not shown here, a truss frame (reinforcing material) may be installed between the upper frame portion 1941 and the lower frame portion 1942 in order to improve the strength of the seat rail 194, as in the main frame 192.

The pivot frame 195 extends downward from the rear part of the main frame 192, and the swing arm 196 is supported by the pivot frame 195 and supports the rear wheel RW so as to be swingable.

The saddle riding type electric vehicle 1 further includes a battery 11, an electric power unit 12, a control device 13, an electric pump 14, and a heat exchanger 15. A rechargeable secondary battery is used for the battery 11, and examples thereof include a lithium ion battery and a nickel metal hydride battery. The battery 11 is built in the vehicle body 10 and is fixed to a predetermined part of the vehicle body frame between the pair of left and right main frames 192 in the present embodiment. A charging terminal portion is provided on the exposed surface of the vehicle body 10, and the battery 11 can be charged by connecting a predetermined charging plug to the terminal portion.

The electric power unit 12 generates power (rotation) based on the electric power of the battery 11. In this embodiment, the electric power unit 12 is fixed to a predetermined part of the vehicle body frame in a space below the main frame 192, behind the down frame 193, and in front of the pivot frame 195. Accordingly, the electric power unit 12 is fixed at a position where power can be appropriately transmitted to the rear wheel RW, and the power is transmitted to the rear wheel RW via, for example, a chain. An electric motor such as a three-phase induction motor is used for the electric power unit 12. The electric power unit 111 may be expressed as a motor unit or the like. Although details will be described later, the electric power unit 12 is configured to be cooled by a predetermined cooling medium (for example, oil), and a storage unit 121 (for example, an oil pan) capable of storing the cooling medium is provided below the electric power unit 12. ) Is provided.

The control device 13 has a function of converting a DC voltage into an AC voltage and is also called a PDU (power drive unit) or the like, or further includes a function of converting an AC voltage into a DC voltage, a function of converting a voltage level, and the like. It is also called a PCU (power control unit). For example, the control device 13 converts the electric power of the battery 11 into a predetermined mode and supplies the electric power unit 12 to the electric power unit 12 to control the electric power unit 12. The control device 13 can also charge the battery 11 using electric power generated by regenerative braking of the electric power unit 12. In the present embodiment, the control device 13 is disposed below the battery 11 and is juxtaposed with the electric power unit 12 in the vehicle width direction. According to such an arrangement mode, it is possible to make the wiring portion (wire harness) necessary for supplying the electric power of the battery 11 to the electric power unit 12 relatively short.

Although details will be described later, the electric pump 14 circulates a cooling medium to cool the electric power unit 12 and the control device 13 respectively. For example, the electric pump 14 is disposed in front of the storage part 121 of the electric power unit 12 and circulates a cooling medium (for example, oil for cooling the electric power unit 12) in the storage part 121. In the present embodiment, the electric pump 14 includes a plurality of elements which will be described later, and may be expressed as an electric pump unit or the like.

The heat exchanger 15 is arranged in front of the vehicle body 10 so that the traveling wind hits when the saddle riding type electric vehicle 1 travels. Although details will be described later, the heat exchanger 15 performs heat exchange of another cooling medium (for example, water) pumped by the electric pump 14 using the traveling wind.

FIG. 2 is a block diagram showing a configuration of the saddle riding type electric vehicle 1. The electric pump 14 includes two types of

pump chambers

141 and 142, a power chamber 143, and a heat exchanger 144. In the present embodiment, the pump chamber 141 is a water pump chamber that pumps water as a cooling medium, and the pump chamber 142 is an oil pump chamber that pumps oil as another cooling medium. The power chamber 143, which will be described later in detail, drives the

pump chambers

141 and 142 using an electric motor, and realizes the water and oil pumping.

In the figure, the flow path of water is indicated by broken-line arrows, and pipes P _WA to P _WC are shown as the pipes forming the flow path. The pipe _PWA connects the water pump chamber 141 and the heat exchanger 15. The pipe _PWB connects the heat exchanger 15 and the control device 13. The pipe _PWC connects the control device 13 and the water pump chamber 141.

Similarly, an oil flow path is indicated by an alternate long and short dash line arrow, and pipes P _OA to P _OC are shown as pipes forming the flow path. The pipe _POA connects the heat exchanger 144 and the electric power unit 12. The pipe _POB connects the electric power unit 12 and the oil pump chamber 142. The pipe _POC connects the oil pump chamber 142 and the heat exchanger 144.

Water pump chamber 141, pumping the water to the heat exchanger 15 through the pipe _{P WA.} The water that has passed through the heat exchanger 15 is cooled by heat exchange, and then passes through the control device 13 via the piping _PWB to cool the control device 13 (water cooling), and then the water pump chamber via the piping _PWC. It will return to 141. Note that a radiator is used as the heat exchanger 15, and the water passing through the heat exchanger 15 is cooled by the traveling wind generated when the saddle riding type electric vehicle 1 is traveling as described above.

The water pump chamber 141 pumps water to the heat exchanger 144 as well as pumps water to the heat exchanger 15. Although details will be described later, the water that has passed through the heat exchanger 144 is heated by heat exchange, and then returns to the water pump chamber 141.

Oil pump chamber 142, pumping the oil to heat exchanger 144 through the pipe _{P OC.} Oil passing through the heat exchanger 144 is cooled by heat exchange, then passes through the electric power unit 12 via the pipe P _OA electric power unit 12 was cooled (oil cooling), an oil pump via a pipe P _OB It will return to the chamber 142. Although omitted here, an oil filter for washing oil may be further provided in the middle of the oil flow path.

FIG. 3 is a schematic cross-sectional view for explaining the internal structure of the electric pump 14. In the figure, for easy understanding of the structure, an X axis, a Y axis, and a Z axis that intersect with each other are shown (the same applies to cross-sectional views described later). In the figure, the cross-sectional structure of each element of the electric pump 14 is shown, the flow path of water is indicated by a dashed arrow, and the flow path of oil is indicated by a dashed-dotted arrow.

The above-described water pump chamber 141, oil pump chamber 142, power chamber 143, and heat exchanger 144 are formed by being partitioned by the housing 14H of the electric pump 14. The housing 14H may be formed by connecting two or more members by welding or fastening, or may be integrally formed.

The water pump chamber 141 includes an impeller 1411 as a rotating body for pumping water. The oil pump chamber 142 includes an inner rotor 1421 and an outer rotor 1422 as rotating bodies for pumping oil. The power chamber 143 includes an inner rotor 1431 provided with a magnet and an outer stator 1432 provided with a coil. The inner rotor 1431 and the outer stator 1432 form an electric motor 143M.

The power (rotation) of the electric motor 143M is transmitted to the impeller 1411 of the water pump chamber 141 and the inner rotor 1421 of the oil pump chamber 142 via the common shaft 140. That is, the rotating shaft of the impeller 1411 and the rotating shaft of the inner rotor 1421 are supported on the same axis, and the impeller 1411 and the inner rotor 1421 are driven in common by the electric motor 143M via the shaft 140. Here, the rotation axes of the impeller 1411 and the inner rotor 1421 are assumed to be an axis AX1, and the axial direction thereof corresponds to the X direction in the drawing.

As can be seen from the enlarged cross-sectional view (cross-sectional view of the YZ plane) of the water pump chamber 141 shown in the drawing, a plurality of impellers 1411 are provided around the shaft 140, and the plurality of impellers 1411 includes the shaft 140. Via the power from the electric motor 143M. As a result, the water in the water pump chamber 141 is pumped as indicated by the dashed arrows.

As can be seen from the enlarged sectional view of the oil pump chamber 142 further shown in the drawing (the sectional view of the YZ plane), the outer rotor 1422 is rotatably supported on the outside of the inner rotor 1421 in accordance with the housing 14H. When the inner rotor 1421 rotates by receiving power from the electric motor 143M via the shaft 140, the outer rotor 1422 also rotates according to the rotation (the outer rotor 1422 rotates on a rotation axis different from the axis AX1). In the meantime, the oil is sucked into the space between the inner rotor 1421 and the outer rotor 1422 from the suction port 1423 and then discharged from the space to the discharge port 1424. As a result, the oil in the oil pump chamber 142 is pumped as indicated by the one-dot chain line arrow.

In summary, a water pump chamber 141 that pumps water using an impeller 1411 and an oil pump chamber 142 that pumps oil using an inner rotor 1421 and an outer rotor 1422 are arranged in parallel in the X direction. The impeller 1411 and the inner rotor 1421 are arranged such that their rotation axes are coaxial (on the axis AX1). The power chamber 143 is provided in parallel with the oil pump chamber 142 in the X direction, and the electric motor 143M of the power chamber 143 supplies power to both the impeller 1411 and the inner rotor 1421 using a common shaft 140.

The heat exchanger 144 is provided between the water pump chamber 141 and the oil pump chamber 142. That is, in this embodiment, the power chamber 143, the oil pump chamber 142, the heat exchanger 144, and the water pump chamber 141 are arranged in this order in the + X direction. The heat exchanger 144 performs heat exchange between water and oil. Hereinafter, this will be described by focusing on the waters w1 to w8 and the oils о1 to о7 forming the predetermined flow path.

First, in the water pump chamber 141, the water that has passed through the heat exchanger 15 and the control device 13 is guided to the electric pump 14 by the pipe _PWC (see w1), and the water w1 that has returned to the water pump chamber 141 is caused by the rotation of the impeller 1411. It is pumped (see w2). Some piezoelectric feed water w2 is pumped to the heat exchanger 15 through a pipe P _WA (see w3), also some other pumped to the heat exchanger 144 (see w4). The water w4 pumped to the heat exchanger 144 flows into the heat exchanger 144 (see w5). The water w5 flowing into the heat exchanger 144 flows out of the heat exchanger 144 (see w6) after heat exchange described later (see w6), returns to the water pump chamber 141 through the water passage in the housing 14H (see w7) ( w8).

Next, the oil pump chamber 142, the oil passing through the electric power unit 12 is directed to the electric pump 14 by a pipe _{P OB} (see O1), returns to the oil pump chamber 142 through the oil passage in the housing 14H (see O2) . Oil о2 in the oil pump chamber 142 is pumped by rotation of the inner rotor 1421 and the outer rotor 1422 (see о3). Piezoelectric fed by oil о3 is (see O4) through an oil passage in the housing 14H corresponding to the pipe P _OC in Figure 2 is guided to the heat exchanger 144 (see о5). The oil path to the heat exchanger 144 is formed in a ring shape in the circumferential direction of the shaft 140, and this oil 5 is also shown on the lower side in the figure. Although details will be described later, in the heat exchanger 144, heat exchange is performed between the oil 5 and the water w5. Thereafter, the oil о5 passing through the heat exchanger 144, with a portion of which is supplied as lubricating oil to a bearing provided on the shaft 140 (see O6), it is pumped to the electric power unit 12 via the pipe P _OA (See о7).

FIG. 4 is a schematic cross-sectional view (cross-sectional view in the YZ plane) for explaining the internal structure of the heat exchanger 144. The heat exchanger 144 includes a plurality of heat radiation fins 1441 arranged in a heat exchange chamber 1440 formed by the housing 14H. In the present embodiment, the plurality of fins 1441 are arranged in the X direction, and each of the plurality of fins 1441 is a plate material having a disk shape (disk shape). Each fin 1441 is preferably made of a metal having a relatively high thermal conductivity such as aluminum (Al) or iron (Fe).

An inflow port 1443 through which water w5 in FIG. 3 flows is provided below the heat exchange chamber 1440, and an outflow port 1444 through which water w6 in FIG. 3 flows out is provided above the heat exchange chamber 1440. As a result, the heat exchange chamber 1440 is filled with water pumped from the water pump chamber 141. This heat exchange chamber 1440 forms part of the flow path of the water pumped from the water pump chamber 141.

A pipe 1442 that forms an oil flow path is provided in the heat exchange chamber 1440 through a plurality of fins 1441. The pipe 1442 is located on the path between the pipe _{P OA} and _{P OC} of FIG. 3, is plurality to be aligned in the circumferential direction about the shaft 140. As the oil passes through the plurality of pipes 1442, the heat of the oil is transmitted to the plurality of fins 1441, and the water in the heat exchange chamber 1440 that houses the plurality of pipes 1442 and the plurality of fins 1441 together with the oil In this case, heat exchange is performed. That is, the oil that passes through the pipe 1442 is cooled by the water in the heat exchange chamber 1440.

Each of the plurality of fins 1441 may be arranged in a posture parallel to the YZ plane. In addition, the inlet 1443 and the outlet 1444 may be positioned so as to face each other in the Z direction in the heat exchange chamber 1440. Thereby, the water in the heat exchange chamber 1440 flows along the plurality of fins 1441 from the inlet 1443 toward the outlet 1444, so that the heat exchange rate of the heat exchanger 144 is improved, that is, the oil is appropriately cooled. Is done.

In the present embodiment, since each of the plurality of fins 1441 has a disk shape, the heat exchange chamber 1440 for accommodating them can be configured relatively simply, and the structure of the electric pump 14 can be made compact. it can.

As described above, according to the electric pump 14 of the present embodiment, the water pump chamber 141 and the oil pump chamber 142 are arranged in parallel in the X direction. The shaft of the impeller 1411 in the water pump chamber 141 and the shaft of the inner rotor 1421 in the oil pump chamber 142 are supported coaxially (on the shaft AX1). The impeller 1411 and the inner rotor 1421 receive power from the electric motor 143M in the power chamber 143 through the common shaft 140. In such a configuration, a heat exchanger 144 that performs heat exchange between water and oil is provided between the water pump chamber 141 and the oil pump chamber 142. Therefore, according to the present embodiment, the two types of

pump chambers

141 and 142 are configured as a unit, and a structure having a heat exchange function using them can be realized in a relatively compact manner. Therefore, according to the present embodiment, it is possible to improve the cooling efficiency in such an electric pump 14 with a relatively simple configuration.

The above-described configuration of the electric pump 14 is merely an example, and various changes may be added to the configuration of the electric pump 14 depending on the purpose and the like. For example, regarding the flow path of the cooling medium (water, oil in the embodiment), the order or path of elements through which the cooling medium passes may be changed.

FIG. 5 shows, similarly to FIG. 2, a block diagram showing a configuration of a saddle riding type electric vehicle 1 including an electric pump 14 ′ instead of the electric pump 14 as another embodiment. In the above-described electric pump 14 (see FIG. 2), the heat exchanger 144 and the heat exchanger 15 are arranged in parallel downstream of the water pump chamber 141, whereas according to the electric pump 14 ′ (see FIG. 5). For example, the heat exchanger 144 and the heat exchanger 15 are arranged in series. Therefore, in the electric pump 14 ′, all the water pumped from the water pump chamber 141 passes through the heat exchanger 144 and then passes through the heat exchanger 15.

FIG. 6 shows a schematic cross-sectional view for explaining the internal structure of the electric pump 14 ′ in the same manner as FIG. According to the electric pump 14 ′, all of the water w2 pumped from the water pump chamber 141 is pumped to the heat exchanger 144 (see w4), that is, the flow path of the water w3 in FIG. 3 is not provided. Then, water w7 which has passed through the heat exchanger 144 in the electric pump 14 'is then pumped to the heat exchanger 15 through a pipe P _WA (see w9), that is, the flow path of the water w8 of Figure 3 is provided It is not done.

According to the electric pump 14 ′, all of the water pumped from the water pump chamber 141 passes through the heat exchanger 144. That is, the flow path between the water pump chamber 141 and the heat exchanger 144 does not branch. Therefore, all the water pumped from the water pump chamber 141 passes through the heat exchanger 144, so that heat exchange with the oil is effectively performed, and the oil is appropriately cooled. Therefore, according to the electric pump 14 ', an effect similar to or higher than that of the electric pump 14 can be realized.

In the examples of FIGS. 5 and 6, the water (see w6, w7, w9) that has received heat from the oil is then pumped to the heat exchanger 15 and cooled, and then passes through the control device 13. Then, the control device 13 is cooled and then returned to the water pump chamber 141 (see w1).

As yet another example, the positions of the control device 13 and the heat exchanger 15 in the water flow path may be reversed. That is, the water (refer to w6, w7, and w9) that has received heat from the oil is pumped to the control device 13 to cool the control device 13 and then cooled through the heat exchanger 15, and then the water pump. You may return to the chamber 141 (see w1).

As mentioned above, although some suitable aspects were illustrated, this invention is not limited to them, A part may be changed or combined in the range which does not deviate from the meaning of this invention. In addition, it is needless to say that each term described in this specification is merely used for the purpose of describing the present invention, and the present invention is not limited to the strict meaning of the term. The equivalent can also be included.

For example, the saddle riding type refers to a type in which the driver rides across the vehicle body, and the concept of the saddle riding type electric vehicle 1 described in the embodiment includes a motorcycle (including a scooter type vehicle). , A vehicle with three wheels (a vehicle with one front wheel and two rear wheels, or a vehicle with two front wheels and one rear wheel) is also included. In addition, the electric pump 14 described in the embodiment can be used for various purposes, and is not limited to application to a straddle-type vehicle or an electric vehicle.

The features of the above embodiment are summarized as follows:
A first aspect relates to an electric pump (for example, 14), and the electric pump uses a first rotating body (for example, 1411) to pump a first cooling medium (for example, water) to a first pump chamber (for example, water). 141) and a second rotating shaft that is arranged in parallel with the first pump chamber in the axial direction (for example, X direction) of the rotating shaft (for example, AX1) of the first rotating body, and has the rotating shaft coaxially with the rotating shaft. A second pump chamber (for example, 142) that pumps a second cooling medium (for example, oil) using a rotating body (for example, 1422), and the second pump chamber (for example, 142) in the axial direction. A power chamber (for example, 143) provided with an electric motor (for example, 143M, 1431, 1432) capable of supplying power to both the first and second rotating bodies using a shaft (for example, 140); 1 and the second pump chamber Provided, comprising a heat exchanger for exchanging heat (e.g. 144), between said first and said second cooling medium.

According to the first aspect, it is possible to realize a compact structure in which two types of pump chambers are configured as a unit and further provided with a heat exchange function using them. Thereby, an electric pump capable of improving the cooling performance can be realized with a relatively simple configuration.

In the second aspect, a pipe (for example, 1442) that forms one flow path of the first and second cooling media is further provided, and the heat exchanger includes a plurality of fins ( For example, 1441) is provided, and the piping is provided through the plurality of fins.

According to the second aspect, the one cooling medium (for example, oil) can be appropriately cooled (heat exchange).

In the third aspect, each of the plurality of fins is a disk-shaped plate material (for example, 1441).

According to the third aspect, the structure of the electric pump can be made compact.

In the fourth aspect, a plurality of the pipes are provided around the shaft in a circumferential direction.

According to the fourth aspect, the one cooling medium (for example, oil) can be further appropriately cooled (heat exchange).

In the fifth aspect, the heat exchanger accommodates a pipe (for example, 1442) that forms one flow path of the first and second cooling media, and the first and second cooling media. The heat exchange chamber (for example, 1440) used as the other flow path is included.

According to the fifth aspect, the one cooling medium (for example, oil) can be further appropriately cooled (heat exchange).

In the sixth aspect, the heat exchanger includes a plurality of fins (for example, 1441) arranged in the axial direction, and each of the plurality of fins is fixed in a posture intersecting the axial direction, and the heat exchanger The exchange chamber is provided with the other inflow port (for example, 1443) and the other outflow port (for example, 1444) of the first and second cooling media, and the inflow port and the outflow port. Are opposed to each other in a direction (for example, Z direction) intersecting the axial direction in the heat exchange chamber.

According to the sixth aspect, the other cooling medium (for example, water) can easily flow along the fins, and the heat exchange efficiency between the two types of cooling medium can be improved.

In the seventh aspect, the one of the first and second cooling media is oil, and the other of the first and second cooling media is water.

According to the seventh aspect, the oil that is the one cooling medium can be appropriately cooled (heat exchange).

The eighth aspect relates to a straddle-type electric vehicle (for example, 1), and the straddle-type electric vehicle has an electric power unit (for example, 12) for driving the above-described electric pump (for example, 14) and wheels (for example, RW). And).

According to the eighth aspect, the above-described electric pump can be appropriately applied to a typical / general straddle-type electric vehicle.

In the ninth aspect, the electric power unit is configured to be cooled by one of the first and second cooling media.

According to the ninth aspect, the electric power unit provided in the saddle riding type electric vehicle can be appropriately cooled (heat exchange) by the one cooling medium (for example, oil).

In a tenth aspect, a second heat exchanger (connected to the electric pump via a second pipe (for example, P _WA ) that forms the other flow path of the first and second cooling media ( 15) and a control device (for example, 13) that controls the electric power unit based on the power of a battery (for example, 11), and the control device has passed through the second heat exchanger. Via a third pipe (for example, P _WB , P _WC ) that forms the other flow path so that the other of the first and second cooling media passes through the control device and returns to the electric pump. Connected to the second heat exchanger and the electric pump.

According to the tenth aspect, the second cooling medium (for example, water) that is heated by heat exchange with the one cooling medium (for example, oil) in the heat exchanger is appropriately cooled in the second heat exchanger. (Heat exchange) is possible.

The present invention is not limited to the above-described embodiment, and various changes or modifications can be made without departing from the gist of the present invention. Therefore, in order to make the scope of the present invention public, the following claims are attached.

This application claims priority based on Japanese Patent Application No. 2018-068861 filed on Mar. 30, 2018, the entire contents of which are incorporated herein by reference.

14: electric pump, 140: shaft, 141: water pump chamber, 1411: impeller, 142: oil pump chamber, 1421: inner rotor, 1422: outer rotor, 143: power chamber, 143M: electric motor, 144: heat exchanger.

Claims

A first pump chamber that pumps the first cooling medium using the first rotating body;
The second cooling medium is pumped by using a second rotating body that is arranged in parallel with the first pump chamber in the axial direction of the rotating shaft of the first rotating body and has a rotating shaft coaxially with the rotating shaft. A second pumping chamber,
A power chamber provided in parallel with the second pump chamber in the axial direction and provided with an electric motor capable of supplying power to both the first and second rotating bodies using a common shaft;
An electric pump comprising: a heat exchanger provided between the first and second pump chambers and performing heat exchange between the first and second cooling media.
A pipe that forms one flow path of the first and second cooling media;
The heat exchanger includes a plurality of fins arranged in the axial direction,
The electric pump according to claim 1, wherein the pipe is provided through the plurality of fins.
The electric pump according to claim 2, wherein each of the plurality of fins is a disk-shaped plate member.
The electric pump according to claim 3, wherein a plurality of the pipes are provided so as to be arranged in a circumferential direction around the shaft.
The heat exchanger accommodates a pipe forming one flow path of the first and second cooling media, and has a heat exchange chamber serving as the other flow path of the first and second cooling media. The electric pump according to claim 1, wherein the electric pump is included.
The heat exchanger includes a plurality of fins arranged in the axial direction,
Each of the plurality of fins is fixed in a posture intersecting the axial direction,
In the heat exchange chamber, the other inflow port of the first and second cooling media and the other outflow port are provided,
The electric pump according to claim 5, wherein the inflow port and the outflow port face each other in the direction intersecting the axial direction in the heat exchange chamber.
The electric pump according to claim 5 or 6, wherein the one of the first and second cooling media is oil, and the other of the first and second cooling media is water. .
The electric pump according to any one of claims 1 to 7,
A straddle-type electric vehicle comprising: an electric power unit for driving wheels.
The straddle-type electric vehicle according to claim 8, wherein the electric power unit is configured to be cooled by one of the first and second cooling media.
A second heat exchanger connected to the electric pump via a second pipe forming the other flow path of the first and second cooling media;
A control device for controlling the electric power unit based on the power of the battery,
The control device passes the other flow path so that the other of the first and second cooling media that has passed through the second heat exchanger passes through the control device and returns to the electric pump. The straddle-type electric vehicle according to claim 9, wherein the straddle-type electric vehicle is connected to the second heat exchanger and the electric pump through a third pipe to be formed.