JP6774909B2 - Rotating machine - Google Patents

Description

The present invention relates to a rotary electric machine.

The stator of a rotary electric machine is configured by winding a winding around a stator core. The stator is generally cooled by a refrigerant because the temperature rises when the rotary electric machine operates. In the water-cooled rotary electric machine, a stator housing having a water jacket is provided on the outer peripheral side of the stator core, and cooling water is passed through the water jacket for cooling. Conventionally, the water jacket of the stator housing has been manufactured by casting using a core. However, according to this manufacturing method, it takes time and effort, and there are problems in terms of productivity and cost.

Therefore, it has been proposed to divide the stator housing into two parts and combine them to form a water jacket. Specifically, as shown in FIG. 4, the conventional rotary electric machine 100 includes a stator 101, a rotor 103 supported by a rotor shaft 102 and rotatably arranged on the inner peripheral side of the stator 101, and a stator 101. It has a stator housing 104 arranged on the outer peripheral side of the above, and a pair of cover members 105 arranged on the left and right sides of the stator housing 104 to accommodate the stator 101 and the rotor 103. The stator housing 104 includes a cylindrical outer peripheral side housing 106 having inward flange portions 107 at both ends, and a cylindrical inner peripheral side housing 108 fitted in the inward flange portion 107 of the outer peripheral side housing 106. The space between the side housing 106 and the inner peripheral side housing 108 is a water jacket 109. The sealing surfaces of the outer peripheral side housing 106 and the inner peripheral side housing 108 are sealed by O-rings 110 attached to both ends on the outer diameter side of the inner peripheral side housing 108. Further, Patent Document 1 proposes a method for manufacturing a tubular case in which a cylindrical inner case is press-fitted into an outer case to form a water jacket between the two.

JP 2015-208051

However, in the stator housing 104 of the type shown in FIG. 4, since the stator housing 104 is arranged on the outer peripheral side of the stator 101, the diameters of the sealing surfaces of the outer peripheral side housing 106 and the inner peripheral side housing 108 become large, and therefore the O-ring 110 also has a large diameter. Become. It is difficult to mount the large-diameter O-ring 110 on the inner peripheral side housing 108 in a uniform state, and bias often occurs. That is, the cross-sectional diameter of the O-ring 110 becomes smaller on the side where the O-ring 110 is stretched and mounted, and the cross-sectional diameter of the O-ring 110 becomes thicker on the side opposite to the stretched side, resulting in a decrease in sealing performance. I am concerned. Further, it is difficult to manufacture the large-diameter O-ring 110, which poses a problem in production. Further, in the method for manufacturing a tubular case described in Patent Document 1, the inner case is press-fitted into the outer case to form a tubular case having a water jacket, but the seal between the inner case and the outer case is press-fitted. There is concern about long-term sealing performance.

An object of the present invention is to provide a rotary electric machine which is easy to manufacture and has excellent cooling performance while improving the sealing performance between two case members forming a housing.

In order to achieve the above object, the invention according to claim 1 is
The stator (for example, the stator 11 in the embodiment described later) and
A rotor arranged on the inner peripheral side of the stator (for example, a rotor 13 in the embodiment described later) and
A rotor shaft that rotates integrally with the rotor (for example, the rotor shaft 12 in the embodiment described later) and
A rotary electric machine (for example, a rotary electric machine) that houses the stator and the rotor and has a water jacket (for example, the water jacket 20 in the embodiment described later) inside (for example, the housing 16 in the embodiment described later). The rotary electric machine 10) according to the embodiment described later.
The housing is
A bottomed cylindrical case member (for example, the case member 14 in the embodiment described later) and
It has a cover member (for example, a cover member 15 in the embodiment described later) that seals an opening on one end side of the case member.
The case member
The inner peripheral side cylindrical portion (for example, the inner peripheral side cylindrical portion 21 in the embodiment described later) and the other end side end portion of the inner peripheral side cylindrical portion (for example, the other end side end portion 21a in the embodiment described later). ) Inwardly extending inward in the radial direction (for example, the inward flange portion 22 in the embodiment described later), and a first case member (for example, the inner peripheral side case 18 in the embodiment described later).
Diameter from the outer peripheral side cylindrical portion (for example, the outer peripheral side cylindrical portion 25 in the embodiment described later) and the other end side end portion of the outer peripheral side cylindrical portion (for example, the other end side end portion 25a in the embodiment described later). It has an inward flange portion extending inward in the direction (for example, the inward flange portion 26 in the embodiment described later) and a second case member having the inward flange portion (for example, the outer peripheral side case 19 in the embodiment described later).
The water jacket is provided between the inner peripheral side cylindrical portion and the inward flange portion of the first case member and the outer peripheral side cylindrical portion and the inward flange portion of the second case member.
One end side end portion of the inner peripheral side cylindrical portion of the first case member (for example, one end side end portion 21b in the embodiment described later) and one end side end portion of the outer peripheral side cylindrical portion of the second case member (for example) For example, it is sealed with a cured liquid gasket (for example, the cured liquid gasket 30 in the embodiment described later) with one end side end portion 25b) in the embodiment described later.
The inner diameter side end portion of the inward flange portion of the first case member (for example, the inner diameter side end portion 22a in the embodiment described later) and the inner diameter side end portion of the inward flange portion of the second case member (for example, described later). Is sealed with an O-ring (for example, the O-ring 31 in the embodiment described later) with the inner diameter side end portion 26a) in the embodiment.

Further, the invention according to claim 2 is the invention according to claim 1.
The first case member is provided with an outward flange portion (for example, an outward flange portion 23 in the embodiment described later) extending radially outward at the one end side end portion of the inner peripheral side cylindrical portion.
The second case member is provided with a bumping portion (for example, a bumping portion 27 in the embodiment described later) at the one end side end portion of the outer peripheral side cylindrical portion.
The cured liquid gasket is arranged between the outward flange portion of the first case member and the abutting portion of the second case member.

Further, in the invention according to claim 3, in the invention according to claim 1 or 2.
The stator includes a stator core (for example, the stator core 11a in the embodiment described later) and a coil attached to the stator core (for example, the coil 11b in the embodiment described later).
The housing is provided with a refrigerant storage unit (for example, a refrigerant storage unit 17 in the embodiment described later) for storing a refrigerant (for example, a refrigerant C in the embodiment described later) at the bottom thereof.
The lower part of the coil is immersed in the refrigerant storage portion.

Further, in the invention according to claim 4, in the invention according to any one of claims 1 to 3.
The inward flange portion of the second case member is a power transmission portion (for example, a motor gear 44, a first gear 45, a second gear 46, a third gear 47 in the embodiment described later) having a plurality of gears (for example, a third gear 47). , It is arranged so as to be adjacent to the gear reduction mechanism 40) in the embodiment described later.

According to the invention according to claim 1, a portion far from the rotor shaft, that is, one end side end of the inner peripheral side cylindrical portion of the first case member and one end side end of the outer peripheral side cylindrical portion of the second case member. The part is sealed with a hardened liquid gasket, and the part that is close to the rotor shaft, that is, the inner diameter side end of the inward flange part of the first case member and the inner diameter side end of the inward flange part of the second case member. Since the O-ring is sealed between the portions, the water jacket can be easily formed, and the deformation of the O-ring can be suppressed by avoiding an increase in the diameter of the O-ring. As a result, the sealing performance of the water jacket can be improved.

According to the second aspect of the invention, the cured liquid gasket is arranged between the outward flange portion of the first case member and the abutting portion of the second case member, and thus the first case member and the second case member. A water jacket can be easily formed by combining the case member with the case member from the axial direction.

According to the third aspect of the present invention, the lower part of the coil is immersed in the refrigerant storage portion provided at the bottom of the housing, so that the stator core is cooled from the outer peripheral side by the water jacket, and the coil is also the refrigerant storage portion. It is cooled by the refrigerant of.

According to the invention of claim 4, since the inward flange portion of the second case member is arranged so as to be adjacent to the power transmission portion having a plurality of gears, the power transmission portion can be cooled by the water jacket. It can prevent seizure of gears.

It is a vertical sectional view which shows the outline of the structure of the rotary electric machine of one Embodiment which concerns on this invention. It is sectional drawing which shows the outline of the structure of the rotary electric machine arranged adjacent to a power transmission part. It is a vertical sectional view of the rotary electric machine shown in FIG. It is a vertical cross-sectional view which shows the outline of the structure of the conventional rotary electric machine.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing an outline of the configuration of the rotary electric machine of the present embodiment. As shown in FIG. 1, the rotary electric machine 10 is arranged on the stator 11, the rotor 13 supported by the rotor shaft 12 and rotatably arranged on the inner peripheral side of the stator 11, and on the outer peripheral side of the stator 11. A bottomed cylindrical case member 14 and a cover member 15 for sealing an opening on one end side of the case member 14 are provided. A refrigerant storage portion 17 for storing the refrigerant C is provided at the bottom of the housing 16 formed of the case member 14 and the cover member 15.

The case member 14 is formed by combining the inner peripheral side case 18 which is the first case member and the outer peripheral side case 19 which is the second case member from the axial direction, and the inner peripheral side case 18 and the outer peripheral side case 19 are formed. A water jacket 20 is provided in the space between the two.

The inner peripheral side case 18 is a bottomed cylindrical member, and includes an inner peripheral side cylindrical portion 21, an inward flange portion 22 extending radially inward from the other end side end portion 21a of the inner peripheral side cylindrical portion 21. To be equipped. Further, an outward flange portion 23 extending radially outward is formed at one end side end portion 21b of the inner peripheral side cylindrical portion 21. Further, the inner diameter side end portion 22a of the inward flange portion 22 is formed with an annular protrusion 24 that projects outward in the axial direction. When the inner peripheral side case 18 and the outer peripheral side case 19 are combined, the annular protrusion 24 secures a space serving as a water jacket 20 between the inner peripheral side case 18 and the outer peripheral side case 19.

The outer peripheral side case 19 is a bottomed cylindrical member, and has a diameter from the outer peripheral side cylindrical portion 25 having an inner diameter larger than the outer diameter of the inner peripheral side cylindrical portion 21 and the other end side end portion 25a of the outer peripheral side cylindrical portion 25. An inward flange portion 26 extending inward in the direction is provided. Further, a bumping portion 27 is provided at one end side end portion 25b of the outer peripheral side cylindrical portion 25.

Then, the inner peripheral side case 18 is inserted into the outer peripheral side cylindrical portion 25 of the outer peripheral side case 19, the abutting portion 27 of the outer peripheral side case 19 is abutted against the outer flange portion 23 of the inner peripheral side case 18, and the inner circumference is The annular protrusion 24 of the side case 18 and the inward flange 26 of the outer peripheral case 19 are in contact with each other and assembled. As a result, the water jacket 20 is formed in the space between the inner peripheral side case 18 and the outer peripheral side case 19. Specifically, the water jacket 20 having a substantially L-shaped cross section between the inner peripheral side cylindrical portion 21 and the inward flange portion 22 of the inner peripheral side case 18 and the outer peripheral side cylindrical portion 25 and the inward flange portion 26 of the outer peripheral side case 19. Is formed.

Then, the large-diameter sealing portion between the outward flange portion 23 of the inner peripheral side case 18 and the abutting portion 27 of the outer peripheral side case 19 is sealed with the cured liquid gasket 30. Further, the small-diameter seal portion between the inner diameter side end 22a (annular protrusion 24) of the inward flange portion 22 of the inner peripheral side case 18 and the inner diameter side end portion 26a of the inward flange portion 26 of the outer peripheral side case 19 is , Sealed by an O-ring 31.

Here, the liquid gasket 30 (FIPG: Formed In Place Gasket) is a material in which a liquid material is applied, bonded, cured, bonded and sealed, and an RTV silicone-based material is mainly used. Demonstrates the same sealing performance regardless of the size of the diameter of the sealing part.

In this way, the large-diameter sealing surface is sealed with the liquid gasket 30, and the relatively small-diameter sealing surface is sealed with the O-ring 31, so that the large-diameter sealing surface is similar to that of the conventional rotary electric machine 100 shown in FIG. It is possible to solve the deterioration of the sealing performance due to the deformation of the O-ring 110 and the problem in the production of the O-ring 110. That is, the O-ring 31 can be a general-purpose product having a small diameter, and not only cost reduction but also sealing performance is guaranteed.

In the rotary electric machine 10 of the present embodiment, the stator 11 is cooled from the outer peripheral side by the refrigerant C flowing in the water jacket 20. Further, the coil (not shown) of the stator 11 can be directly cooled by the refrigerant C such as cooling oil stored in the refrigerant storage portion 17 of the housing 16 formed by the case member 14 and the cover member 15. Further, since the refrigerant C stored in the refrigerant storage portion 17 is in contact with the inward flange portion 22 of the inner peripheral side case 18, it is cooled by the refrigerant flowing in the water jacket 20 between the inward flange portions 22 and 26. The stator 11 is efficiently cooled.

It is possible to seal both the large-diameter sealing surface and the small-diameter sealing surface with the liquid gasket 30, but it takes two steps to apply the liquid gasket 30 to two places, and the liquid gasket 30 requires two steps. It takes time to apply and may increase the cost. Further, it is necessary to prepare a dedicated facility capable of applying the liquid gasket 30 to two places having different radial positions, which is not preferable.

2 and 3 are schematic views in which the power transmission unit is arranged adjacent to the rotary electric machine of the present embodiment. The power transmission unit shown in FIGS. 2 and 3 is a gear reduction mechanism 40 composed of a plurality of gears, and includes a first shaft 41 and a second shaft 42 rotatably supported by bearings 43, respectively. The motor gear 44 fixed to the rotor shaft 12 meshes with the first gear 45 arranged on the first shaft 41 to rotate the second gear 46 fixed to the first shaft 41. The second gear 46 meshes with the third gear 47 arranged on the second shaft 42 to decelerate the rotation of the rotor shaft 12 and output from the second shaft 42.

In general, the gear seizure of the gear reduction mechanism tends to cause seizure in proportion to the product (P × V × T) of the meshing surface pressure (P), the meshing speed (V), and the temperature (T) of the gear. It is said that this is likely to occur at the meshing portion (primary meshing) between the motor gear 44 and the first gear 45, which has a large meshing speed (V).

In the rotary electric machine 10 of the present embodiment, since the meshing portion between the motor gear 44 and the first gear 45 is arranged adjacent to the inward flange portion 26 of the outer peripheral side case 19, the meshing portion flows in the water jacket 20. It is cooled by the refrigerant C to improve seizure toughness.

As described above, according to the rotary electric machine 10 according to the present embodiment, the housing 16 that houses the stator 11 and the rotor 13 and has the water jacket 20 inside is a bottomed cylindrical case member 14 and a cover member. It is composed of 15. The case member 14 is formed by assembling the inner peripheral side case 18 and the outer peripheral side case 19. The inner peripheral side case 18 has an inner peripheral side cylindrical portion 21 and an inward flange portion 22 extending radially inward from the other end side end portion 21a of the inner peripheral side cylindrical portion 21, and the outer peripheral side case 19 has. The outer peripheral side cylindrical portion 25 has an inward flange portion 26 extending radially inward from the other end side end portion 25a of the outer peripheral side cylindrical portion 25. The water jacket 20 is provided between the inner peripheral side cylindrical portion 21 and the inward flange portion 22 of the inner peripheral side case 18 and the outer peripheral side cylindrical portion 25 and the inward flange portion 26 of the outer peripheral side case 19, and is provided on the inner circumference. The one end side end 21b of the inner peripheral side cylindrical portion 21 of the side case 18 and the one end side end portion 25b of the outer peripheral side cylindrical portion 25 of the outer peripheral side case 19 are sealed with a cured liquid gasket 30 and have an inner circumference. The inner diameter side end 22a of the inward flange portion 22 of the side case 18 and the inner diameter side end 26a of the inward flange portion 26 of the outer peripheral side case 19 are sealed by an O-ring 31. As a result, the sealing surface that is far from the rotor shaft 12 is sealed with the cured liquid gasket 30, and the sealing surface that is close to the rotor shaft 12 is sealed by the O-ring 31 to easily secure the water jacket 20. It can be formed, and deformation of the O-ring 31 can be suppressed by avoiding an increase in the diameter of the O-ring 31. As a result, the sealing performance of the water jacket 20 is improved.

Further, the inner peripheral side case 18 is provided with an outward flange portion 23 extending radially outward at one end side end portion 21b of the inner peripheral side cylindrical portion 21, and the outer peripheral side case 19 is provided with one end of the outer peripheral side cylindrical portion 25. The abutting portion 27 is provided on the side end portion 25b, and the cured liquid gasket 30 is arranged between the outward flange portion 23 of the inner peripheral side case 18 and the abutting portion 27 of the outer peripheral side case 19, so that it is inside. The water jacket 20 can be easily formed by combining the peripheral case 18 and the outer peripheral case 19 from the axial direction.

Further, the stator 11 includes a stator core 11a and a coil 11b attached to the stator core 11a. The housing 16 is provided with a refrigerant storage unit 17 for storing the refrigerant C at the bottom, and the lower part of the coil is the refrigerant storage unit. Since it is immersed in 17, the stator core 11a is cooled from the outer peripheral side by the water jacket 20, and the coil 11b is also cooled by the refrigerant C of the refrigerant storage unit 17.

Further, since the inward flange portion 26 of the outer peripheral side case 19 is arranged so as to be adjacent to the gear reduction mechanism 40 having a plurality of gears, the gear reduction mechanism 40 can be cooled by the water jacket 20, and the gears are seized. Can be prevented.

The present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, and the like.

10 Rotating electric machine 11 Stator 11a Stator core 11b Coil 12 Rotor shaft 13 Rotor 14 Case member 15 Cover member 16 Housing 17 Refrigerant storage 18 Inner peripheral side case (first case member)
19 Outer peripheral case (second case member)
20 Water jacket 21 Inner peripheral side cylindrical part 21a Other end side end 21b One end side end 22 Inward flange part 22a Inner diameter side end 25 Outer peripheral side cylindrical part 25a Other end side end 25b One end side end 26 Inward flange part 26a Inner diameter side end 23 Outer flange part 25 Outer outer side cylindrical part 27 Butt part 30 Liquid gasket 31 O-ring 40 Gear reduction mechanism (power transmission part)
44 Motor gear (gear)
45 First gear (gear)
46 Second gear (gear)
47 Third gear (gear)
C Refrigerant

Claims (4)

With the stator
A rotor arranged on the inner peripheral side of the stator and
A rotor shaft that rotates integrally with the rotor,
A rotary electric machine including a housing that houses the stator and the rotor and has a water jacket inside.
The housing is
With a bottomed cylindrical case member,
It has a cover member that seals an opening on one end side of the case member.
The case member
A first case member having an inner peripheral side cylindrical portion and an inward flange portion extending radially inward from the other end side end portion of the inner peripheral side cylindrical portion.
A second case member having an outer peripheral side cylindrical portion and an inward flange portion extending radially inward from the other end side end portion of the outer peripheral side cylindrical portion.
The water jacket is provided between the inner peripheral side cylindrical portion and the inward flange portion of the first case member and the outer peripheral side cylindrical portion and the inward flange portion of the second case member.
The one end side end of the inner peripheral side cylindrical portion of the first case member and the one end side end portion of the outer peripheral side cylindrical portion of the second case member are sealed with a cured liquid gasket.
A rotary electric machine in which an inner diameter side end portion of the inward flange portion of the first case member and an inner diameter side end portion of the inward flange portion of the second case member are sealed by an O-ring. The rotary electric machine according to claim 1.
The first case member is provided with an outward flange portion extending radially outward at the one end side end portion of the inner peripheral side cylindrical portion.
The second case member is provided with an abutting portion at the one end side end portion of the outer peripheral side cylindrical portion.
The cured liquid gasket is a rotary electric machine arranged between the outward flange portion of the first case member and the abutting portion of the second case member. The rotary electric machine according to claim 1 or 2.
The stator includes a stator core and a coil attached to the stator core.
The housing is provided with a refrigerant storage portion for storing the refrigerant at the bottom.
A rotary electric machine in which the lower part of the coil is immersed in the refrigerant storage portion. The rotary electric machine according to any one of claims 1 to 3.
A rotary electric machine in which the inward flange portion of the second case member is arranged so as to be adjacent to a power transmission portion having a plurality of gears.

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