JP2020120425A - Rotor - Google Patents

Abstract

To provide a rotor which facilitates manufacture of an end face plate and suppresses leakage of a coolant from the end face plate in the end face plate in which a coolant path where the coolant can flow is formed.SOLUTION: A rotor comprises: a shaft 2 which is configured to be rotatable around an axis C and includes a shaft center cooling path 25 in which a coolant S flows; a rotor core 3 which is fixed to the shaft 2 and formed by laminating multiple steel plates 30 and in which a cooing flow channel 36 is formed in an axial direction of the axis C; and an end face member 6 which is disposed adjacently to an end face of the rotor core 3 and includes a coolant path 60 communicating the axial center cooling path 25 and the cooling flow channel 36. The end face member 6 is formed by laminating multiple end face plates in the axial direction, and the multiple end face plates include a first end face plate 41 which is positioned farthest from the rotor core 3 in the axial direction, and a second end face plate 42 which is adjacent to the rotor core 3 and thinner than the first end face plate 41.SELECTED DRAWING: Figure 2

Description

The present invention relates to a rotor.

BACKGROUND ART Conventionally, rotating electric machines have been used as a power source for hybrid vehicles and electric vehicles. In a rotating electric machine, a current is supplied to the coil to form a magnetic field in the stator core, and a magnetic attractive force or repulsive force is generated between the permanent magnet of the rotor and the stator core. This causes the rotor to rotate with respect to the stator.
By the way, an end face plate for fixing the rotor to the shaft may be provided at the end portion of the rotor in the axial direction. For this reason, various techniques for easily manufacturing the end plate have been proposed.

For example, Patent Document 1 includes a core body formed by stacking a plurality of core plates, and a pair of end plate bodies arranged on both end surfaces of the core body in the stacking direction. The structure formed by stacking the constituent plate materials of (1) in the thickness direction is described. According to the technique described in Patent Document 1, each of the constituent plate members can be made thinner than the plate thickness of the conventional end plate body, so that the end plate body can be easily manufactured.

JP, 2012-147616, A

However, in the technique described in Patent Document 1, when the refrigerant passage through which the refrigerant can flow is formed inside the end plate body (end face member), the refrigerant leaks from between the two constituent plate members (end face plate). May occur.

Therefore, it is an object of the present invention to provide a rotor in which an end surface member having a refrigerant passage through which a refrigerant can flow can be easily manufactured and in which refrigerant leakage from the end surface member is suppressed.

In order to solve the above problems, a rotor according to the invention described in claim 1 (for example, the rotor 1 in the first embodiment) is configured to be rotatable around an axis (for example, the axis C in the first embodiment). A shaft (for example, the shaft 2 in the first embodiment) having a shaft cooling passage (for example, the shaft cooling passage 25 in the first embodiment) through which a refrigerant (for example, the refrigerant S in the first embodiment) flows; The cooling channel is fixed to the shaft and is formed by stacking a plurality of steel plates (for example, the steel plate 30 in the first embodiment) along the axial direction of the axis (for example, the cooling flow path 36 in the first embodiment). ) Is formed (for example, the rotor core 3 in the first embodiment) and a refrigerant passage (for example, the first passage) that is disposed adjacent to the end surface of the rotor core and that communicates the axial cooling passage and the cooling passage. End face member (for example, the end face member 6 in the first embodiment) having the refrigerant passage 60) in one embodiment, and the end face member is formed by stacking a plurality of end face plates in the axial direction. The plurality of end face plates are adjacent to the first end face plate (for example, the first end face plate 41 in the first embodiment) that is farthest from the rotor core in the axial direction, and the first end face plate. The second end face plate (for example, the second end face plate 42 in the first embodiment) having a smaller plate thickness than the face plate is included.

A rotor according to a second aspect of the present invention is characterized in that the first end face plate and the second end face plate are adjacent to each other.

Further, in the rotor according to the invention described in claim 3, the end surface member has an axial flow path extending in the axial direction (for example, the first axial flow path 46, the second axial flow path in the first embodiment). 48) and a radial flow path (for example, the first radial flow path 45 in the first embodiment) extending in the radial direction of the axis line, and the radial flow path in the first end face plate. It is characterized in that it is formed on a surface facing the second end face plate.

Further, in the rotor according to the invention described in claim 4, the plurality of end face plates are a third end face plate sandwiched between the first end face plate and the second end face plate (for example, the second embodiment. The third end face plate 243) is further included, and the third end face plate has the same plate thickness as the second end face plate.

Further, in the rotor according to the fifth aspect of the present invention, the end surface member has an axial flow path extending in the axial direction (for example, the first axial flow path 246 and the second axial flow path in the second embodiment). 248) and a radial passage extending in the radial direction of the axis (for example, the third radial passage 250 in the second embodiment), the radial passage being provided on the third end face plate. It is characterized by being formed.

According to the rotor of claim 1 of the present invention, since the end surface member has the refrigerant passage that connects the axial cooling passage and the cooling passage, the refrigerant flowing through the axial cooling passage passes through the refrigerant passage and the rotor core. Is supplied to the cooling flow path. As a result, the rotor core can be cooled. Since the end face member is formed by laminating a plurality of end face plates, each end face plate can be thinly formed. As a result, the end face member can be manufactured more easily than when the end face member is formed from one member. Further, since the end face member is composed of a plurality of end face plates, the refrigerant passage can be easily formed inside the end face member. Further, the versatility can be improved by changing the material of each end face plate.
The end face member has a first end face plate arranged at a position farthest from the rotor core and a second end face plate adjacent to the rotor core, and the second end face plate is formed thinner than the first end face plate. .. Therefore, when the rotor core and the end face plate are sandwiched and fixed from the axial direction, the second end face plate is pressed against the first end face plate side by the force of the steel plate of the rotor core trying to open outward in the axial direction. On the other hand, since the first end face plate is formed thicker than the second end face plate, the load in the opening direction from the second end face plate can be received. Therefore, it is possible to suppress the occurrence of a gap between the end plates and prevent the refrigerant from leaking from the end plates.
Therefore, in the end face member in which the refrigerant passage through which the coolant can flow is formed, it is possible to provide the rotor in which the end face member is easily manufactured and the refrigerant leakage from the end face member is suppressed.

According to the rotor of claim 2 of the present invention, since the end face member is formed by only two plates, the first end face plate and the second end face plate, the constituent members of the end face member are minimized. Can be reduced to Therefore, an increase in the number of parts can be suppressed. Further, the refrigerant passage can be easily formed by forming the refrigerant passage between the first end face plate and the second end face plate. Therefore, the end member having the refrigerant passage therein can be easily manufactured. Further, when the rotor core and the end face plate are sandwiched and fixed from the axial direction, the second end face plate is pressed against the first end face plate by the force of the steel plate of the rotor core trying to open outward in the axial direction, and is deformed. In this way, the second end face plate acts as a packing between the rotor core and the first end face plate, so that refrigerant leakage from between the end face plates and between the end face member and the rotor core can be suppressed.

According to the rotor of claim 3 of the present invention, since the radial flow path is formed in the surface of the first end face plate facing the second end face plate, the first end face plate and the second end face plate are separated from each other. By laminating, the radial flow path can be easily formed inside the end member. Since the radial flow path is not exposed at the end surface of the rotor core, for example, the unbalance of the rotor caused by the refrigerant unintentionally entering a portion not intended to supply the refrigerant, such as a thinned hole formed in the rotor core, may occur. Can be suppressed. Moreover, since the refrigerant from the axial cooling passage can be reliably supplied to the cooling passage of the rotor core, the cooling efficiency can be improved. Further, since the arrangement of the cooling passages and the lightening holes in the rotor core can be freely set, the degree of freedom in designing the rotor core can be improved. Therefore, it is possible to obtain a high-performance rotor in which unbalance of the rotor is suppressed, cooling efficiency is improved, and design freedom of the rotor core is improved.

According to the rotor of claim 4 of the present invention, since the end face member is formed by three end face plates of the first end face plate, the second end face plate, and the third end face plate, each end face plate Can be formed thinner. Therefore, the end surface member can be easily manufactured. Since the third end face plate has the same plate thickness as the second end face plate, when the rotor core and the end face plate are sandwiched and fixed from the axial direction, the second end due to the force of the steel plate of the rotor core opening outward in the axial direction. The face plate and the third end face plate are pressed against the first end face plate and deform. In this way, the second end face plate and the third end face plate act as packing between the rotor core and the first end face plate, so that refrigerant leakage from between the end face plates and between the end face member and the rotor core can be suppressed. ..

According to the rotor of claim 5 of the present invention, since the radial flow passage is formed in the third end face plate, only the axial flow passage is formed in the first end face plate and the second end face plate. Just do it. That is, the first end face plate has an axial flow passage, the second end face plate has an axial flow passage, and the third end face plate has a radial flow passage. In this way, the structure of the refrigerant passage in each end face plate can be simplified, so that each end face plate can be formed only by a punching step of a press, for example. Therefore, the labor at the time of manufacturing can be reduced and the manufacturing cost can be reduced. Further, since the manufacturing is facilitated, the dimensional variation of each refrigerant passage can be reduced. Therefore, the end plate can be easily manufactured, and the rotor with improved processing accuracy can be obtained.

Sectional drawing of the rotor which concerns on 1st Embodiment (sectional view which follows the II line of FIG. 6). Sectional drawing of the rotor which concerns on 1st Embodiment (sectional view which follows the II-II line of FIG. 6). The front view of the 1st end face plate which concerns on 1st Embodiment. The rear view of the 1st end face plate which concerns on 1st Embodiment. The front view of the 2nd end surface plate which concerns on 1st Embodiment. The front view of the 1st end surface member which concerns on 1st Embodiment. Sectional drawing of the rotor which concerns on 2nd Embodiment (sectional view which follows the VII-VII line of FIG. 12). Sectional drawing of the rotor which concerns on 2nd Embodiment (sectional view which follows the VIII-VIII line of FIG. 12). The front view of the 1st end face plate which concerns on 2nd Embodiment. The front view of the 2nd end surface plate which concerns on 2nd Embodiment. The front view of the 3rd end surface plate which concerns on 2nd Embodiment. The front view of the 1st end surface member which concerns on 2nd Embodiment. Sectional drawing of the rotor which concerns on a prior art.

Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a cross-sectional view of a first cross section of the rotor 1 according to the first embodiment. FIG. 2 is a cross-sectional view of the second cross section of the rotor 1 according to the first embodiment. Specifically, FIG. 1 is a sectional view taken along the line I-I of FIG. 6, and FIG. 2 is a sectional view taken along the line II-II of FIG. In FIG. 1 and FIG. 2, a part which is symmetrical with respect to the axis C is omitted.
The rotor 1 shown in FIG. 1 is used as a rotor 1 of a rotating electric machine used as a power source of a hybrid vehicle or an electric vehicle, for example. The rotor 1 is formed in an annular shape around the axis C. In the following description, a direction along the axis C of the rotor 1 may be referred to as an axial direction, a direction orthogonal to the axis C may be referred to as a radial direction, and a direction around the axis C may be referred to as a circumferential direction.

On the outer side of the rotor 1 in the radial direction, stators (not shown) are arranged at intervals. The rotor 1 is configured to be rotatable about the axis C with respect to the stator by generating a magnetic attractive force or a repulsive force between the magnet 32 housed in the rotor 1 and the coil mounted on the stator. Has been done.
As shown in FIG. 1, the rotor 1 has a shaft 2, a rotor core 3, an end surface member 6, and a collar 7.

(shaft)
The shaft 2 is formed in a tubular shape that is concentric with the axis C. The shaft 2 is supported by a rotating electrical machine case via bearings (not shown). The shaft 2 is rotatable around the axis C. The shaft 2 has a shaft body 21 and a protruding wall portion 22.

The shaft body 21 is formed in a tubular shape centered on the axis C. The shaft body 21 has an axial cooling passage 25 and a communication passage 26.
The axial cooling passage 25 is provided concentrically with the shaft body 21. The shaft center cooling passage 25 penetrates the shaft body 21 in the axial direction. The coolant S supplied by a pump (not shown) is allowed to flow through the shaft cooling passage 25.
The communication passage 26 extends inside the shaft main body 21 along the radial direction. The communication passage 26 connects the shaft cooling passage 25 and the outer peripheral portion 21 a of the shaft body 21. A plurality of communication passages 26 are provided radially in the circumferential direction.

The protruding wall portion 22 is provided on one axial side of the shaft body (left side in FIG. 1). The projecting wall portion 22 projects outward in the radial direction from the outer peripheral portion 21 a of the shaft body 21. The projecting wall portion 22 is connected to the shaft body 21. The projecting wall portion 22 is formed on the outer peripheral portion 21 a of the shaft body 21 over the entire circumference in the circumferential direction.

(Rotor core)
The rotor core 3 is formed in an annular shape around the axis C. The rotor core 3 is arranged radially outside the shaft 2. The rotor core 3 has a core body 31 and a magnet 32.

The core body 31 is formed in an annular shape centered on the axis C. The core body 31 is formed by stacking a plurality of steel plates 30 in the axial direction. The outer dimensions of the core body 31 are larger than the outer dimensions of the protruding wall portion 22 of the shaft 2. The core body 31 has a magnet holding hole 35, a cooling flow path 36, a lightening hole 37, and a shaft insertion hole 38.

The magnet holding hole 35 is provided on the outer peripheral portion of the core body 31. The magnet holding hole 35 penetrates the core body 31 in the axial direction. A plurality of magnet holding holes 35 are formed in the circumferential direction.
The cooling flow path 36 is provided inside the magnet holding hole 35 in the radial direction. The cooling flow path 36 penetrates the core body 31 in the axial direction. A plurality of (8 in the present embodiment) cooling channels 36 are formed in the circumferential direction.
The lightening hole 37 is provided inside the cooling flow path 36 in the radial direction. The lightening hole 37 penetrates the core body 31 in the axial direction. A plurality of lightening holes 37 are formed in the circumferential direction and the radial direction.
The shaft insertion hole 38 is provided so as to be concentric with the axis C. The shaft insertion hole 38 penetrates the core body 31 in the axial direction. The shaft 2 is press-fitted and fixed in the shaft insertion hole 38 in a state of penetrating the shaft 2. As a result, the rotor core 3 and the shaft 2 rotate integrally around the axis C.

The magnet 32 is inserted into the magnet holding hole 35 of the core body 31. The magnet 32 is, for example, a rare earth magnet. Examples of rare earth magnets include neodymium magnets, samarium cobalt magnets and praseodymium magnets.

(End member)
The end surface member 6 is arranged adjacent to the end surface of the rotor core 3, and sandwiches the rotor core 3 in the axial direction. The end surface member 6 has a first end surface member 61 and a second end surface member 62.
The first end surface member 61 is arranged on one side in the axial direction of the rotor core 3. The first end surface member 61 is in contact with the end surface of the rotor core 3 on one axial side. The first end face member 61 is formed by stacking a plurality of end face plates in the axial direction. The first end face member 61 has a first end face plate 41, a second end face plate 42, and a refrigerant passage 60.

The first end face plate 41 is arranged at a position apart from the rotor core 3 in the axial direction. The first end face plate 41 is in contact with the protruding wall portion 22 of the shaft 2.

FIG. 3 is a front view of the first end face plate 41 seen from the other axial side (right side in FIG. 1). FIG. 4 is a rear view of the first end face plate 41 seen from one axial side (the left side in FIG. 1).
As shown in FIG. 3, the first end face plate 41 is formed in an annular shape around the axis C. The first end face plate 41 is made of a metal material such as aluminum. The outer shape of the first end face plate 41 is formed to be substantially the same as the outer shape of the rotor core 3. The first end face plate 41 has a first shaft insertion hole 44, a first radial direction flow channel 45, and a first axial direction flow channel 46.

The first shaft insertion hole 44 is provided so as to be concentric with the axis C. The first shaft insertion hole 44 penetrates the first end face plate 41 in the axial direction. The shaft 2 is press-fitted and fixed in the first shaft insertion hole 44 in a penetrating state.

The first radial flow path 45 is formed on the surface of the first end face plate 41 facing the second end face plate (the face facing the other side in the axial direction) (see also FIG. 2 ). The first radial flow passages 45 are radially formed with a plurality of intervals (eight in this embodiment) at intervals in the circumferential direction. The first radial flow passage 45 has a supply port 45a and a bulging portion 45b.
The supply port 45a extends in the radial direction. The supply port 45a is recessed from the first end face plate 41 toward one side in the axial direction. The radially inner end of the supply port 45a communicates with the first shaft insertion hole 44. In other words, as shown in FIG. 2, the radially inner end of the supply port 45a communicates with the communication passage 26 of the shaft 2. As a result, the refrigerant flowing through the communication passage 26 of the shaft 2 can flow into the supply port 45a.
The bulging portion 45b is provided radially outside the supply port 45a. The bulging portion 45b is recessed from the first end face plate 41 toward one side in the axial direction. The bulging portion 45b is formed in a long hole shape having a long axis in the radial direction. The radially inner end of the bulging portion 45b communicates with the supply port 45a. The radially outer end of the bulging portion 45b ends at the radially intermediate portion of the first end face plate 41. When viewed from the front, the circumferential width dimension of the bulging portion 45b is larger than the circumferential width dimension of the supply port 45a.

The first axial flow passage 46 is arranged between the first radial flow passages 45 that are adjacent to each other in the circumferential direction. A plurality of first axial flow paths 46 (eight in this embodiment) are formed in the circumferential direction. The first axial flow path 46 has a distribution port 46a and a through hole 46b.
The distribution port 46a extends in the radial direction. The supply port 45a is recessed from the first end face plate 41 toward one side in the axial direction. The radially inner end of the distribution port 46a communicates with the first shaft insertion hole 44. In other words, as shown in FIG. 1, the radially inner end portion of the distribution port 46 a communicates with the communication passage 26 of the shaft 2. As a result, the refrigerant flowing through the communication passage 26 of the shaft 2 can flow into the distribution port 46a.
The through hole 46b is provided radially outside the distribution port 46a. As shown in FIGS. 3 and 4, the through hole 46b penetrates the first end face plate 41 in the axial direction. The through hole 46b is formed in a long hole shape having a long axis in the circumferential direction. As shown in FIG. 3, the radially inner end of the through hole 46b communicates with the distribution port 46a. The radially outer end of the through hole 46b is located radially inward of the radially outer end of the bulging portion 45b.

Returning to FIG. 1, the second end face plate 42 is adjacent to the rotor core 3 and the first end face plate 41. Specifically, the end surface on the other axial side of the second end surface plate 42 is in contact with the rotor core 3. The end face of the second end face plate 42 on the one axial side is in contact with the first end face plate 41. The second end face plate 42 is formed to be thinner than the first end face plate 41.

FIG. 5 is a front view of the second end plate 42 seen from the other side in the axial direction. FIG. 6 is a front view of the first end face plate 41 and the second end face plate 42 in a stacked state as seen from the other side in the axial direction.
As shown in FIG. 5, the second end face plate 42 is formed in an annular shape around the axis C. The second end face plate 42 is formed of a metal material such as aluminum. The outer shape of the second end face plate 42 is formed to be substantially the same as the outer shape of the rotor core 3. The second end face plate 42 has a second shaft insertion hole 47 and a second axial flow passage 48.

The second shaft insertion hole 47 is provided so as to be concentric with the axis C. The second shaft insertion hole 47 penetrates the second end face plate 42 in the axial direction. The shaft 2 is inserted through the second shaft insertion hole 47.

The second axial flow passage 48 has a circular cross section and penetrates the second end face plate 42 in the axial direction. A plurality of second axial flow channels 48 (eight in this embodiment) are formed in the circumferential direction. As shown in FIG. 6, the second axial flow path 48 is formed at a position corresponding to the first radial flow path 45 of the first end face plate 41. Specifically, the second axial flow passage 48 is formed at a position that matches the bulging portion 45b of the first radial flow passage 45 in the circumferential direction. The second axial passage 48 partially overlaps the bulging portion 45b in the radial direction, and is located radially outside the bulging portion 45b. As shown in FIG. 2, the second axial passage 48 communicates with the first radial passage 45 of the first end face plate 41 and the cooling passage 36 of the rotor core 3, respectively. The second axial flow passage 48 is located radially inward of the cooling flow passage 36.

As shown in FIG. 6, in a laminated state in which the first end face plate 41 and the second end face plate 42 are laminated, the second end face plate 42 is arranged on the front side of the paper surface and the first end face plate 41 is arranged on the rear side of the paper surface. ing.
The refrigerant passage 60 includes a first radial flow passage 45 of the first end face plate 41, a first axial flow passage 46 of the first end face plate 41, a second axial flow passage 48 of the second end face plate 42, Have. As shown in FIGS. 1 and 2, the first end face plate 41 and the second end face plate 42 are axially stacked, so that the refrigerant passage 60 is provided inside the first end face member 61. The refrigerant passage 60 connects the axial center cooling passage 25 of the shaft 2 and the cooling passage 36 of the rotor core 3.

As shown in FIG. 1, the second end surface member 62 is arranged on the other side in the axial direction of the rotor core 3. The second end surface member 62 is in contact with the end surface of the rotor core 3 on the other axial side. The second end surface member 62 is formed in an annular shape centered on the axis C. The second end surface member 62 is made of a metal material such as aluminum. The outer shape of the second end surface member 62 is formed to be substantially the same as the outer shape of the rotor core 3. The second end surface member 62 has a discharge hole 65. The discharge hole 65 has a circular cross section and penetrates the second end face plate 42 in the axial direction. The discharge hole 65 communicates with the cooling flow path 36 of the rotor core 3.

(Color)
The collar 7 is arranged on the other side in the axial direction with respect to the second end surface member 62. The collar 7 is in contact with the second end surface member 62. The collar 7 is formed in an annular shape around the axis C. The collar 7 is formed of a metal material such as iron. The shaft 2 is press-fitted and fixed to the inner peripheral portion 7 a of the collar 7. The outer dimension of the collar 7 is smaller than the outer dimension of the protruding wall portion 22 of the shaft 2. The collar 7 axially presses the rotor core 3 and the end surface member 6 arranged between the collar 7 and the protruding wall portion 22 of the shaft 2.

(Action and effect of rotor)
Next, the operation and effect of the rotor 1 will be described.
As shown in FIG. 1, when the rotor 1 rotates, the coolant S is supplied from the outside of the rotor 1 to the axial cooling passage 25 of the shaft 2 by a pump. The refrigerant S supplied to the axial cooling passage 25 flows into the communication passage 26 by the centrifugal force of rotation and moves inside the communication passage 26 toward the outer side in the radial direction. The coolant S supplied from the communication passage 26 to the coolant passage 60 of the first end face member 61 flows into the first axial flow passage 46 of the first end face plate 41 as shown in FIG. As shown, it is divided into the refrigerant S flowing into the first radial passage 45 of the first end face plate 41.

As shown in FIG. 1, a part of the refrigerant S flowing through the communication passage 26 flows into the first axial passage 46 of the first end face plate 41. Specifically, the refrigerant S flows from the communication passage 26 into the distribution port 46a of the first axial flow path 46 and moves inside the distribution port 46a toward the radially outer side. Then, the refrigerant S flows into the through hole 46b from the supply port 46a. The refrigerant S flowing into the through hole 46b moves toward one side in the axial direction and is discharged to the outside of the rotor 1 from the end surface of the first end face plate 41 on the one side in the axial direction. The refrigerant S discharged from the first end face plate 41 scatters radially outward due to the centrifugal force and its inertial force. As a result, the refrigerant S is supplied to the coil ends (not shown) located on one axial side of the stator arranged radially outside the rotor 1 to cool the stator.

On the other hand, as shown in FIG. 2, the remaining part of the refrigerant S flowing through the communication passage 26 flows into the first radial passage 45 of the first end face plate 41. Specifically, the refrigerant S flows from the communication passage 26 into the supply port 45a of the first radial passage 45, and moves inside the supply port 45a toward the radially outer side. Next, the refrigerant S flows into the bulging portion 45b from the supply port 45a and moves inside the bulging portion 45b toward the radially outer side. After that, the refrigerant S that has flowed into the bulging portion 45b passes through the second axial flow passage 48 of the second end face plate 42 and then flows into the cooling flow passage 36 of the rotor core 3. The refrigerant S that has flowed into the cooling flow path 36 further moves toward the other side in the axial direction, and is discharged to the outside of the rotor 1 through the discharge holes 65 of the second end surface member 62. As a result, the heat of the rotor core 3 is absorbed by the refrigerant S, and the rotor core 3 is cooled. Further, the refrigerant S discharged from the second end surface member 62 scatters radially outward due to the centrifugal force and its inertial force. As a result, the refrigerant S is supplied to the coil end (not shown) located on the other axial side of the stator arranged radially outside the rotor 1, and the stator is cooled.

In this way, the coolant S cools the stator and the rotor core 3 via the coolant passage 60 of the end surface member 6. Here, FIG. 13 is a cross-sectional view of the rotor 1 in the related art in which the end surface member 6 is formed of a single plate member. As shown in FIG. 13, when the first end surface member 61 is formed of a single plate member, the radial passage 145 is formed between the rotor core 3 and the first end surface member 61. As a result, the radial flow passage 145 communicates with the lightening hole 37 on the radial inner side of the cooling flow passage 36. Therefore, the refrigerant S flowing through the radial passage 145 flows not only into the cooling passage 36 but also into the lightening hole 37. Therefore, the refrigerant S may flow into the lightening hole 37, which may cause imbalance of the rotor. Further, since the amount of the refrigerant supplied to the cooling flow passage 36 decreases, the cooling efficiency may decrease.

In this configuration, the refrigerant S is supplied only to the cooling flow passage 36 even when the lightening hole 37 is formed radially inward of the cooling flow passage 36. Therefore, with respect to the problems in the related art, it is possible to suppress the imbalance of the rotor 1 and improve the cooling efficiency.

According to the rotor 1 of the present embodiment, the end surface member 6 has the refrigerant passage 60 that communicates the axial cooling passage 25 and the cooling passage 36, so that the refrigerant S flowing through the axial cooling passage 25 passes through the refrigerant passage 60. It is supplied to the cooling flow path 36 of the rotor core 3 through. Thereby, the rotor core 3 can be cooled. Since the end face member 6 is formed by laminating a plurality of end face plates 41, 42, each end face plate 41, 42 can be thinly formed. As a result, the end surface member 6 can be easily manufactured as compared with the case where the end surface member 6 is formed from one member. Further, since the end face member 6 is composed of the plurality of end face plates 41 and 42, the refrigerant passage 60 can be easily formed inside the end face member 6. Further, the versatility can be improved by changing the materials of the end plates 41 and 42.
The end face member 6 has a first end face plate 41 arranged at a position farthest from the rotor core 3 and a second end face plate 42 adjacent to the rotor core 3, and the second end face plate 42 is the first end face plate 41. Is formed thinner than. Therefore, when the rotor core 3 and the end face plates 41 and 42 are sandwiched and fixed from the axial direction, the second end face plate 42 moves toward the first end face plate 41 side by the force of the steel plate 30 of the rotor core 3 opening outward in the axial direction. Pressed against. On the other hand, since the first end face plate 41 is formed thicker than the second end face plate 42, the load in the opening direction from the second end face plate 42 can be received. Therefore, it is possible to suppress the generation of a gap between the end plates 41 and 42, and to suppress the refrigerant leakage from the end plates 41 and 42.
Therefore, in the end face plates 41, 42 in which the coolant passages 60 through which the coolant S can flow are formed, the rotor 1 in which the end face plates 41, 42 are easily manufactured and the coolant leakage from the end face plates 41, 42 is suppressed is provided. it can.

Particularly, in the first embodiment, the end surface member 6 is formed of only two plates, that is, the first end surface plate 41 and the second end surface plate 42. Therefore, the constituent members of the end surface member 6 are minimized. be able to. Therefore, an increase in the number of parts can be suppressed. Further, the refrigerant passage 60 can be easily formed by forming the refrigerant passage 60 between the first end face plate 41 and the second end face plate 42. Therefore, the end surface member 6 having the refrigerant passage 60 therein can be easily manufactured. When the rotor core 3 and the end plates 41 and 42 are sandwiched and fixed from the axial direction, the second end face plate 42 is pressed against the first end face plate 41 by the force of the steel plate 30 of the rotor core 3 opening outward in the axial direction. Be transformed and deformed. Thus, the second end face plate 42 acts as a packing between the rotor core 3 and the first end face plate 41, so that the refrigerant leaks between the end face plates 41 and 42 and between the end face member 6 and the rotor core 3. Can be suppressed.

The first end face plate 41 has a first radial flow passage 45 and a first axial flow passage 46. Since the first radial passage 45 and the first axial passage 46 have different passages, for example, by changing the size of each passage, the first radial passage 45 and the first axial passage The amount of refrigerant flowing in each of the flow paths 46 can be adjusted. This makes it possible to easily and accurately distribute the amount of refrigerant supplied to the one side and the other side in the axial direction.
Further, for example, by changing the hole position of the second axial flow passage 48 in the second end face plate 42 in the radial direction, the refrigerant S can be supplied to any cooling flow passage 36 of the rotor core 3. Thereby, the end surface member 6 can be applied to the rotor core 3 in which the position of the cooling flow path 36 is different from that of the present embodiment. Therefore, the degree of freedom in combining the rotor core 3 and the end surface member 6 can be improved. Further, the refrigerant S can be supplied to a place where cooling is more effective. Further, by changing the number of holes in the second axial flow passage 48, the refrigerant can be supplied to the plurality of cooling flow passages 36. Thereby, the cooling effect of the rotor core 3 can be enhanced.

The second axial flow passage 48 of the second end face plate 42 is arranged radially outside of the bulging portion 45 b of the first end face plate 41 and radially inside of the cooling flow passage 36 of the rotor core 3. As a result, the refrigerant S flowing through the bulging portion 45b easily flows into the bulging portion 45b, the second axial flow passage 48, and the cooling flow passage 36 in this order due to the centrifugal force. Therefore, the circulation of the refrigerant S can be promoted, and the cooling efficiency of the rotor 1 can be further improved.

The first radial flow path 45 is formed on the surface of the first end face plate 41 that faces the second end face plate 42. Therefore, by stacking the first end face plate 41 and the second end face plate 42, the end face member is formed. It is possible to easily form the first radial flow passage 45 inside 6. Since the first radial flow path 45 is not exposed to the end surface of the rotor core 3, the refrigerant S may unintentionally enter a portion such as the lightening hole 37 formed in the rotor core 3 that is not intended to supply the refrigerant S. It is possible to suppress the imbalance of the rotor 1 caused by the above. Further, since the refrigerant S from the axial cooling passage 25 can be reliably supplied to the cooling passage 36 of the rotor core 3, the cooling efficiency can be improved. Furthermore, the arrangement of the cooling passages 36 and the lightening holes 37 in the rotor core 3 can be set freely, so that the degree of freedom in designing the rotor core 3 can be improved. Therefore, it is possible to obtain the high-performance rotor 1 in which the imbalance of the rotor 1 is suppressed, the cooling efficiency is improved, and the degree of freedom in designing the rotor core 3 is improved.

(Second embodiment)
Next, a second embodiment according to the present invention will be described. FIG. 7 is a cross-sectional view of the first cross section of the rotor 201 according to the second embodiment. FIG. 8 is a cross-sectional view of the second cross section of the rotor 201 according to the second embodiment. Specifically, FIG. 7 is a sectional view taken along the line VII-VII of FIG. 12, and FIG. 8 is a sectional view taken along the line VIII-VIII of FIG. FIG. 9 is a front view of the first end face plate 241 as seen from the other side in the axial direction. FIG. 10 is a front view of the second end face plate 242 viewed from the other side in the axial direction. FIG. 11 is a front view of the third end face plate 243 viewed from the other side in the axial direction. FIG. 12 is a front view of the first end surface member 261. FIG. 12 is a diagram of the stacked state in which the first end face plate 241, the second end face plate 242, and the third end face plate 243 are stacked, as viewed from the other side in the axial direction. The present embodiment is different from the above-described embodiments in that the first end surface member 61 has three end face plates.

As shown in FIG. 7, in the present embodiment, the first end surface member 261 has a first end surface plate 241, a second end surface plate 242, a third end surface plate 243, and a refrigerant passage 260.

The first end face plate 241 is arranged at a position farthest from the rotor core 3 in the axial direction. As shown in FIG. 9, the first end face plate 241 has a first shaft insertion hole 244 and a first axial flow path 246. The first shaft insertion hole 244 is provided so as to be concentric with the axis C. The first shaft insertion hole 244 penetrates the first end face plate 241 in the axial direction. The first axial flow path 246 is formed in a long hole shape having a long axis in the circumferential direction. The first axial flow path 246 penetrates the first end face plate 241 in the axial direction. A plurality of first axial flow paths 246 (eight in this embodiment) are formed in the circumferential direction.

As shown in FIG. 7, the second end face plate 242 is adjacent to the rotor core 3. The second end face plate 242 is formed to be thinner than the first end face plate 241. As shown in FIG. 10, the second end face plate 242 has a second shaft insertion hole 247 and a second axial flow path 248. The second shaft insertion hole 247 is provided so as to be concentric with the axis C. The second shaft insertion hole 247 penetrates the second end face plate 242 in the axial direction. The second axial flow path 248 is formed in a circular shape. The second axial flow path 248 penetrates the second end face plate 242 in the axial direction. A plurality of second axial flow channels 248 (eight in this embodiment) are formed in the circumferential direction.

As shown in FIG. 7, the third end face plate 243 is sandwiched between the first end face plate 241 and the second end face plate 242. The third end face plate 243 has the same plate thickness as the second end face plate 242. As shown in FIG. 11, the third end face plate 243 has a third shaft insertion hole 249, a third radial passage 250, and a connection port 251.

The third shaft insertion hole 249 is provided so as to be concentric with the axis C. The third shaft insertion hole 249 penetrates the third end face plate 243 in the axial direction.
The third radial passage 250 penetrates the third end face plate 243 in the axial direction. A plurality of (three in the present embodiment) radial third radial passages 250 are formed in the circumferential direction. The third radial flow path 250 has a supply port 250a and a bulging portion 250b. The supply port 250a extends in the radial direction. The radially inner end of the supply port 250a communicates with the third shaft insertion hole 249. The bulging portion 250b is provided radially outside the supply port 250a. The bulging portion 250b is formed in a long hole shape having a long axis in the radial direction. The radially inner end of the bulging portion 250b communicates with the supply port 250a. As shown in FIG. 12, the radially outer end portion of the bulging portion 250b is formed at a position corresponding to the second axial flow path 248 of the second end face plate 242. Specifically, the radially outer end of the bulging portion 250b partially overlaps the second axial flow channel 248 in the radial direction, and terminates radially inward of the second axial flow channel 248. ..
The connection port 251 is arranged between the third radial flow paths 250 adjacent to each other in the circumferential direction. A plurality (eight in this embodiment) of connection ports 251 are formed in the circumferential direction. The connection port 251 extends in the radial direction. The radially inner end of the connection port 251 communicates with the third shaft insertion hole 249. The radially outer end of the connecting port 251 communicates with the first axial flow path 246 of the first end face plate 241.

In FIG. 12, a second end face plate 242, a third end face plate 243, and a first end face plate 241 are arranged in order from the front side of the paper surface. The refrigerant passage 260 has a first axial flow passage 246, a second axial flow passage 248, a third shaft insertion hole 249, a third radial flow passage 250, and a connection port 251. The first end face plate 241, the second end face plate 242, and the third end face plate 243 are axially stacked, so that the refrigerant passage 260 is provided inside the first end face member 261. The refrigerant passage 260 communicates with the cooling flow passage 36 of the rotor core 3 (see FIG. 8).

According to the present embodiment, the end surface member 6 is formed by three end surface plates, that is, the first end surface plate 241, the second end surface plate 242, and the third end surface plate 243. , 243 can be formed thinner. Therefore, the end surface member 6 can be easily manufactured. Since the third end face plate 243 has the same plate thickness as the second end face plate 242, when the rotor core 3 and the end face plates 241, 242, 243 are sandwiched and fixed from the axial direction, the steel plate 30 of the rotor core 3 is located outside in the axial direction. The second end face plate 242 and the third end face plate 243 are pressed against the first end face plate 241 and deformed by the force of trying to open. In this way, the second end face plate 242 and the third end face plate 243 act as packing between the rotor core 3 and the first end face plate 241, so that between the end face plates 241, 242, 243 and between the end face member 6 and the rotor core. It is possible to suppress the leakage of the refrigerant from between the two.

Further, since the third radial flow passage 250 is formed in the third end face plate 243, only the axial flow passages 246, 248 may be formed in the first end face plate 241 and the second end face plate 242. .. That is, the first end face plate 241 has the first axial flow passage 246, the second end face plate 242 has the second axial flow passage 248, and the third end face plate 243 has the third radial flow passage 250. Have. In this way, the structure of the refrigerant passage 60 in each of the end face plates 241, 242, 243 can be simplified, so that each of the end face plates 241, 242, 243 can be formed only by the punching process of the press, for example. Therefore, the labor at the time of manufacturing can be reduced and the manufacturing cost can be reduced. Further, since the manufacturing is facilitated, the dimensional variation of each refrigerant passage 60 can be reduced. Therefore, the end plates 241, 242, 243 can be easily manufactured, and the rotor 201 with improved processing accuracy can be provided.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, in the present embodiment, the end surface member 6 is made of a metal material such as aluminum, but is not limited to this. For example, some of the plurality of end face plates may be formed of a material other than metal such as resin.
Further, the first end face plates 41 and 241 may also have a function as a balance adjusting member for adjusting an imbalance during rotation of the rotors 1 and 201.
Further, in the present embodiment, the end surface member 6 is configured by stacking two or three plates in the axial direction, but the present invention is not limited to this. For example, the end surface member 6 may be formed by stacking four or more plates in the axial direction.

In addition, it is possible to appropriately replace the constituent elements in the above-described embodiment with known constituent elements within the scope of the present invention, and it is also possible to appropriately combine the above-described modifications.

1,201 rotor 2 shaft 3 rotor core 6 end face member 25 shaft center cooling passage 30 steel plate 36 cooling passages 41, 241 first end face plate (end face plate)
42,242 Second end face plate (end face plate)
45 First radial flow path (radial flow path)
46,246 First axial flow path (axial flow path)
48,248 Second axial flow path (axial flow path)
60, 260 Refrigerant passage 243 Third end face plate (end face plate)
250 Third radial flow path (radial flow path)
C axis S refrigerant

Claims (5)

A shaft that is configured to be rotatable around an axis and that has a shaft cooling passage through which a refrigerant flows,
A rotor core that is fixed to the shaft, is formed by laminating a plurality of steel plates, and has a cooling flow path formed along the axial direction of the axis.
An end face member that is arranged adjacent to the end face of the rotor core and has a refrigerant passage that communicates the axial cooling passage and the cooling passage,
Equipped with
The end face member is formed by stacking a plurality of end face plates in the axial direction,
The plurality of end plates,
A first end face plate that is most distant from the rotor core in the axial direction,
And a second end face plate adjacent to the rotor core and having a thickness smaller than that of the first end face plate. The rotor according to claim 1, wherein the first end face plate and the second end face plate are adjacent to each other. The end surface member has an axial flow passage extending in the axial direction, and a radial flow passage extending in the radial direction of the axis,
The rotor according to claim 2, wherein the radial passage is formed on a surface of the first end face plate facing the second end face plate. The plurality of end face plates further includes a third end face plate sandwiched between the first end face plate and the second end face plate,
The rotor according to claim 1, wherein the third end face plate has the same plate thickness as the second end face plate. The end surface member has an axial flow passage extending in the axial direction, and a radial flow passage extending in the radial direction of the axis,
The rotor according to claim 4, wherein the radial passage is formed in the third end plate.

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