JP4815903B2 - Cooling casing of rotating electric machine - Google Patents

Description

  The present invention relates to a cooling casing for a rotating electrical machine used in a dynamo testing apparatus or the like.

  The dynamo test device is a device for testing the performance of a transmission of an automobile connected to the rotating electric machine as a pseudo load device. In the rotating electrical machine used in this apparatus, the casing has a double structure in order to suppress the heat generation of the stator core, and cooling water, cooling air, etc. are formed in the space formed in the double structure part. There is a thing to be flown (cooled casing) (see, for example, Patent Documents 1 and 2).

A conventional cooling-type casing C ′ will be described. As shown in FIG. 6, the cooling casing C ′ is formed by combining the substantially cylindrical inner and outer casing bodies C ₁ ′ and C ₂ ′ separately manufactured. That is, the substantially straight cylindrical inner casing body C ₂ ′ is press-fitted (shrink-fitted) into the outer casing body C ₁ ′ whose inner peripheral surface is processed into a stepped shape. The casing body C ₂ 'on the outer peripheral surface of the groove 51 for the passage of cooling water is provided in a spiral shape, as shown in (b) of FIG. 4, the outer casing member C _1' of the A cooling water channel W is formed by the peripheral surface and the groove 51. In order to achieve water tightness, the joint surfaces of the inner and outer casing bodies C ₁ ′ and C ₂ ′ are welded.

After the inner and outer casing bodies C ₁ ′ and C ₂ ′ are combined to form the cooling casing C ′, the inner peripheral surface of the cooling casing C ′ is finished and the stator core 3 is attached. Moreover, since cover bodies 53 and 54 are attached to both end surface portions of the cooling casing C ′ by the respective mounting bolts 52, female screws 55 for screwing the respective mounting bolts 52 to both end surface portions of the cooling casing C ′ after the combination. Is processed.

Here, as shown in FIG. 4 (a), the inner and outer casing bodies C ₁ ′ and C ₂ ′ have a double structure on the end surface portion on the P side (described later) of the cooling casing C ′. Therefore, the wall thickness t ′ becomes large. Moreover, since it is necessary to secure a thickness t ′ sufficient to process the female screw 55 in the inner casing body C ₂ ′, the inner diameter d ′ of the cooling casing C ′ (the inner diameter for mounting the cover body 53 on the P side). ) Must be reduced. Moreover, in order to prevent the pilot hole when processing the internal thread 55 from penetrating into the inner surface of the cooling casing C ′, the shape of the inner peripheral surface 56 after finishing must be an inclined surface. Then, the distance e ′ between the inner peripheral surface 56 of the cooling casing C ′ and the coil end 3a of the stator core 3 is shortened, and there is a possibility that both interfere with each other when the stator core 3 is attached. In order to prevent this, if the outer diameter D of the cooling casing C ′ is increased, the entire rotating electrical machine is increased in size. By increasing the size of the rotating electrical machine, the material cost of each member constituting the rotating electrical machine increases, and the installation area of the rotating electrical machine increases.
JP 2003-169441 A JP 2005-124266 A

In view of the above-described problems, an object of the present invention is to reduce the outer diameter of the cooling casing and reduce the overall shape of the rotating electrical machine without reducing the output .

The invention of claim 1 for solving the above problems is composed of an outer casing member made of a casing main body, an inner casing body to be assembled together are inserted fitted inside of this outer casing body, the two inside and outside between each casing body becomes heavy, the rotary electric machine having the configuration cooling medium passage in which the cylindrical space shape for passing a cooling medium for cooling the stator core disposed on the double casing is Ru is formed Each of the inner and outer casing bodies is to the thin-walled body part to such an extent that the thin-walled body part constituting the double casing part and the mounting bolts of the cover body can be screwed together. Each of the casing bodies is integrally assembled with each other. Is shorter than the length of the pacing, the housing body of the inside and outside, assembled together by press fit, that each cover member to each integral casing portions at both ends are configured to be mounted via a mounting bolt It is a feature.

According to the first aspect of the present invention, each of the inner and outer casing bodies has a thin main body portion constituting a double casing portion, and a mounting bolt of the cover body can be screwed to the thin main body portion. It is formed with a thick wall and is composed of an integral casing portion arranged at opposite ends in the assembled state, and both are formed shorter than the length of the casing in which the inner and outer casing bodies are integrally assembled. The inner and outer casing bodies are integrally assembled by press-fitting, and the part that becomes the inner and outer double structure is only the part where the cooling medium passage is formed, and both end parts of the casing are Each of the inner and outer casings is composed of an integral casing part, and the thickness of each of the integral casing parts is the minimum thickness that can be screwed to the cover body mounting bolts. There are thinned. As a result, the outer diameter of the cooling casing is reduced and the overall shape of the rotating electrical machine is reduced without reducing the output .

The invention of claim 2 is the invention of claim 1, connected to the inside of the integral casing portion of the casing body, an annular protrusion which is fitted to the inner peripheral surface of the thin body portion of the outer casing body It is characterized by being formed in a stepped shape.

According to the invention of claim 2, the inner casing body connected to the annular protrusion while the annular protrusion of the inner casing body is fitted to the inner peripheral surface at the end of the thin main body portion of the outer casing body. Since the inner casing portion of the inner casing body is axially connected to one end of the thin-walled main body portion of the outer casing body in a state where the inner end face of the inner casing portion is in contact with the end face of the outer casing body, the outer casing The integrity of the body and the integral casing portion of the inner casing body is enhanced. As a result, the rigidity of the connecting portion is increased in spite of the structure in which the integral casing portion of the inner casing body is connected to one end portion in the longitudinal direction of the outer casing body to ensure the necessary length as the casing. There is no possibility of causing micro-vibration when using the rotating electrical machine (during rotation).

According to the present invention, each of the inner and outer casing bodies is formed with a thin main body portion that constitutes a double casing portion, and a thickness that allows the mounting bolts of the cover body to be screwed to the thin main body portion. Each of the casings disposed at opposite ends in the assembled state, both of which are formed shorter than the length of the casing in which the inner and outer casing bodies are integrally assembled. Each casing body is configured to be integrally assembled by press-fitting, and the inner / outer double structure portion is only a portion where the cooling medium passage is formed, and both end portions of the casing are respectively inner and outer portions. The casing body is composed of an integral casing portion, and the thickness of each of the integral casing portions is a minimum thickness that allows the mounting bolts of the cover body to be screwed together, so that the entire casing is thinned. As a result, without reducing the output, and reducing the outer diameter of the cooling casing, to reduce the overall shape of the rotary electric machine.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to the best examples of the present invention. 1 is an overall perspective view of a rotating electrical machine A according to an embodiment of the present invention, FIG. 2 is a front sectional view of the same, and FIG. 3 is an outer casing body C ₁ , an inner casing body C _2, and cover bodies constituting a cooling casing C. It is a figure which shows the state which isolate | separated 1,2.

As shown in FIGS. 1 to 3, the rotating electrical machine A of the present embodiment is manufactured separately, and is a cooling casing formed by combining an outer casing body C ₁ and an inner casing body C ₂ that form a casing body. C and cover bodies 1 and 2 for closing the open end face portions on both sides of the cooling casing C. A stator core 3 is attached to the inside of the cooling casing C, and a rotor core 4 is rotatably mounted. A rotor shaft 4 a provided on the rotor core 4 protrudes from the cover body 1. Here, the right side (P side) of the cooling-type casing C in the drawing view of FIG.

First, a description will be given of the outer casing member C _1. As shown in FIGS. 1 to 3, the outer casing body C ₁ formed in a substantially cylindrical shape is supported by a rectangular base plate 5. That is, the outer casing body C ₁ is supported in a state where it is placed on each support plate 6 attached to the end of the base plate 5 in the longitudinal direction (the axial direction of the outer casing body C ₁ ). Each support plate 6 is provided with a cooling water supply hole 6 a in a penetrating state along the width direction of the base plate 5. Further, the portions corresponding to the respective support plate portion 6 in the outer casing member C _1, the cooling water supply hole 6a and the communication hole 7 communicating is provided. The cooling water supplied from one of the cooling water supply holes 6a is supplied to a cooling water passage W (described later) provided in the cooling casing C through the communication hole 7, and flows through the cooling water passage W to the other side. It is discharged from the cooling water supply hole 6a on the side. This state is indicated by an arrow 8 in FIG. In FIG. 2, reference numeral 9 denotes a reinforcing plate attached between the support plate portions 6.

As shown in FIG. 3, the inner peripheral surface of the outer casing body C ₁ has a stepped shape, and most of the outer casing body C ₁ extends from the P-side end surface portion 11 to the S-side end surface portion 12. It consists of a thin-walled body portion 13 formed over the entire area and an integral casing portion 14 formed in the other portions. The thin body portion 13 of the outer casing member C ₁ is thin main body portion 17 of the casing body C ₂ among which will be described later is inserted and fitted, double casing of the cooled casing C is formed. A ring-shaped groove portion 15 is provided over the entire circumference in the substantially central portion of the integral casing portion 14 in the axial direction, and cables are inserted through the upper portion of the ring-shaped groove portion 15. A cable through hole 15a is provided. Here, the total length of the outer casing body C ₁ is L ₁ , and the length of the thin main body 13 is also L ₂ . In FIG. 1, reference numeral 16 denotes a terminal box attached to the cable through hole 15a.

Next, a description will be given inner casing member C _2. As shown in FIGS. 2 and 3, the inner casing member C ₂ of this embodiment is substantially cylindrical, thin-walled body portion 17 to be fitted into the thin-walled body portion 13 of the outer casing body C _1, the It comprises an integral casing portion 18 formed at one end of the thin-walled main body portion 17 (P side after being combined), and an annular ridge 19 provided at a connection portion between the thin-walled main body portion 17 and the integral casing portion 18. . The outer diameter of the integral casing portion 18 is substantially the same as the outer diameter of the outer casing body C ₁ , and the outer diameter of the annular protrusion 19 is the same as the outer diameter of the thin-walled body portion 17. Then, the outer peripheral surface of the inner casing member C ₂ of the thin body portion 17, a spiral groove 21 for the passage of cooling water is provided in a spiral shape. Here, the length of the inner casing member C ₂ integral casing section 18 and L _3. As described above, the thin main body portion 17 of the inner casing body C ₂ is inserted and fitted into the thin main body portion 13 of the outer casing body C ₁ . For this reason, the length of the thin-walled main body portion 17 of the inner casing body C ₂ is L ₂ as is the length of the thin-walled main body portion 13 of the outer casing body C ₁ .

The inner casing body C ₂ is press-fitted (shrink-fitted) into the outer casing body C ₁ . As shown in FIG. 2, the end face 17a of the thin body portion 17 of the inner casing member C _2, it is brought into contact with the stepped portion 13a of the integral casing section 14 and the thin-walled body portion 13 of the outer casing member C ₁ . Further, stepped portions 18a of the thin body portion 17 integral casing section 18 of the inner casing member C ₂ is an end face portion 11 and Hoboto contact the P-side of the outer casing member C _1. Thus, the whole of the thin body portion 17 of the inner casing member C ₂ including an annular projection 19 is fitted into the thin-walled body portion 13 of the outer casing body C _1, a thin body portion 13 of the outer casing member C ₁ The space between the thin groove main body portion 17 of the inner casing body C ₂ and the spiral groove portion 21 is closed, and the cooling water channel W is formed. Then, in the fitted state of the inner and outer casing bodies C ₁ and C ₂ , the stepped portions 13 a and 18 a are welded to achieve water-tightness of the cooling water passage W, thereby forming a double-structured cooling casing C. Is done. If the total length of the cooled casing C and L _0, the total length L ₀ is the sum of the length L ₃ of the outer casing member C ₁ of the full length L ₁ and the inner casing member C ₂ integral casing section 18 (L ₀ = L ₁ + L ₃ ). As shown in FIG. 2, the cooling water supply hole 6 a provided in each support plate portion 6 is connected to the axial end portion of the cooling water passage W through each communication hole 7. The cooling water supplied from any one of the cooling water supply holes 6a enters the spiral groove portion 21 through the communication hole 7 and is formed in a spiral shape between the inner and outer casing bodies C ₁ and C _2. It flows around W. Thereby, heat_generation | fever of the stator core 3 is suppressed.

Subsequently, in order to remove distortion caused by welding, the inner peripheral surfaces 22 and 23 of the cooling casing C and the end surfaces 12 and 24 on the S side and P side of the cooling casing C are processed. Here, the “inner peripheral surface 22” is the inner peripheral surface of the double casing portion (the portions of the thin-walled main body portions 13 and 17 of the inner and outer casing bodies C ₁ and C ₂ ) in the cooling casing C, the inner peripheral surface 23 'is the inner peripheral surface of a portion of the inner casing member C ₂ integral casing section 18. An annular protrusion 25 is formed in the vicinity of the P side between the inner peripheral surfaces 22 and 23. The stator core 3 inserted from the S side of the cooling casing C is positioned in contact with the stepped portion between the inner peripheral surface 22 and the protrusion 25. Further, “the end surface portion 12 on the S side of the cooling casing C” means the end surface portion 12 on the S side of the outer casing body C ₁ , and “the end surface portion 24 on the P side of the cooling casing C” It means end face 24 of the integral casing section 18 of the inner casing member C _2.

As shown in FIGS. 2 and 3, the cover bodies 1 and 2 are attached to the end surface portions 12 and 24 on the P side and the S side of the cooling casing C, respectively. Since the configurations of the cover bodies 1 and 2 are almost the same, only the cover body 1 attached to the end surface portion 24 on the P side of the cooling casing C will be described in this specification. Cover member 1 of the present embodiment is approximately the cover main body 1a of the same outer diameter as the integral casing section 18 of the inner casing member C _2, provided in the cover main body 1a concentrically, spigot state to the cooled casing C And a fitting portion 1b to be fitted. A through hole 1c through which the rotor shaft 4a of the rotor core 4 passes is provided in the axial center portion of the cover main body 1a and the fitting portion 1b, and a bearing 26 is attached to the through hole 1c. . The cover body 1 is attached by a plurality of attachment bolts 27 (eight in the case of this embodiment). For this reason, screw insertion holes 28 for the respective mounting bolts 27 are provided at a peripheral angle of the cover body 1a of the cover body 1 at a certain angle in the circumferential direction. Then, in the end surface portion 24 on the P side of the cooling casing C, a female screw 29 for screwing each mounting bolt 27 is processed at a position corresponding to each screw insertion hole 28.

  The stator core 3 and the rotor core 4 are attached to the cooling casing C, and the cover bodies 1 and 2 are attached to the end surface portions 12 and 24 on the P side and S side of the cooling casing C, respectively. Then, the mounting bolts 27 inserted into the plurality of screw insertion holes 28 provided at the peripheral edge portions of the cover bodies 1 and 2 are internally threaded 29 provided on the end surface portions 12 and 24 of the cooling casing C, respectively. Screwed onto.

As shown in FIG. 4A, in the case of the conventional cooling type casing C ′, the inner and outer casing bodies C ₁ ′ and C ₂ ′ are doubled on the end surface portion on the P side of the cooling type casing C ′. It has a structure. For this reason, when the internal thread 55 is provided on the end surface portion on the P side in the cooling casing C ′, it is necessary to increase the thickness of the end surface portion of the inner casing body C ₂ ′ so as to secure the processing region of the internal thread 55. . As a result, the inner diameter d ′ (inlay diameter) for fitting the cover body 53 (see FIG. 6) becomes smaller, and the distance e ′ from the inner peripheral surface 56 of the cooling casing C ′ to the coil end 3a becomes smaller. There is a possibility that the coil end 3a may be shortened and interfere with the coil end 3a.

However, if the cooled casing C of the present embodiment, as shown in (b) of FIG. 4, the end surface portion 24 of the P side of the cooled casing C is only an integral casing section 18 of the inner casing member C ₂ Is formed. For this reason, the area (wall thickness t of the integral casing portion 18) to be secured in the end surface portion 24 in order to process the female screw 29 may be small. In other words, the inner diameter d (inlay diameter) for fitting the cover body 1 can be increased. If the outer diameters D of the cooling casings C and C ′ are the same, the distance e from the inner peripheral surface 23 of the cooling casing C to the coil end 3a becomes longer, and the possibility of interference with the coil end 3a is reduced. And the clearance gap around the said coil end 3a becomes large, and heat dissipation is also good.

In the case of the conventional cooling casing C ′, the joint portion on one side (P side) of each of the inner and outer casing bodies C ₁ ′ and C ₂ ′ is provided on the end surface portion of the cooling casing C ′. For this reason, the finishing machining allowance of the said end surface part must be taken large. However, in the case of the cooling casing C of the present embodiment, the joint portion on one side (P side) of the inner and outer casing bodies C ₁ and C ₂ is provided on the outer peripheral surface of the cooling casing C. For this reason, the finishing process of the joint portion is not necessary, and the processing cost of the end face part 24 can be reduced. Further, since it reduce the wall thickness t of the integral casing section 18 of the inner casing member C _2, material cost of the inner casing member C _2, processing costs can be reduced.

  Further, in the case of the conventional cooling type casing C ′, the inner peripheral surface 56 of the end surface portion on one side (P side) is an inclined surface. Therefore, when processing the portion, the cooling type casing C ′ It was necessary to insert a tool from the other side (S side). However, in the case of the cooling casing C of the present embodiment, the inner peripheral surface 23 of the end surface portion on one side (P side) can be formed into a straight shape. The tool can be inserted as it is from one side (P side), and machining is extremely easy.

Further, as shown in FIG. 5, when the distance t from the inner peripheral surface 23 of the cooling casing C to the coil end 3a is set to the minimum distance e ₁ while keeping the thickness t of the integral casing portion 18 the same, The outer diameter D ₁ and inner diameter d _{1 of} the cooling casing C are reduced by the difference (e−e ₁ ) between the distance e and the distance e ₁ . This means that the overall shape of the cooling casing C can be reduced while avoiding interference between the inner peripheral surface 23 of the cooling casing C and the coil end 3a.

The inner casing body C ₂ constituting the rotary electric machine A of the present embodiment is connected to the inner side of the integral casing portion 18 and is fitted to the inner peripheral surface 22 of the thin body portion 13 of the outer casing body C _1. A ridge 19 is provided. That is, in the end face 11 of the outer casing body C _1, together with the annular ridge 19 of the inner casing member C ₂ is fitted to the inner peripheral surface 22 thereof, the casing member C inner connecting with the annular ridge 19 inner end surface 23 of the _second integral casing section 18, the end face 11 of the outer casing member C ₁ while abutting, integral casing section 18 of the inner casing member C ₂ to one end of the outer casing member C ₁ is axially Therefore, the integrity of the inner and outer casing bodies C ₁ and C ₂ is improved. As a result, the integral casing portion 18 of the inner casing body C ₂ is connected to one longitudinal end portion of the outer casing body C ₁ to ensure the necessary length L ₀ as the cooling casing C. Regardless, the rigidity of the connecting portion is increased, and there is no possibility of causing fine vibration when the rotating electrical machine A is used (during rotation).

  In the present embodiment, a protrusion 25 for positioning the stator core 3 is provided on the inner side in the cooling casing C and in the vicinity of the end surface portion 24 on the P side, and the stator core 3 from the S side of the cooling casing C is provided. Is inserted. However, in the cooling casing C of the present embodiment, an opening having a large inner diameter d can also be provided on the P side, so that the protrusion 25 is provided in the vicinity of the end surface portion 12 on the S side in the cooling casing C. The stator core 3 may be inserted from the P side of the cooling casing C.

  In the present specification, the rotating electrical machine A of the dynamo test apparatus has been described. However, the cooling-type casing mounting structure according to the present invention is also applicable to an apparatus other than a rotating electric machine, which is composed of a double-structured cooling type casing having an airtight or watertight space inside. be able to.

It is a whole perspective view of the rotary electric machine A of the Example of this invention. It is a front sectional view similarly. Cooled outer casing member C ₁ constituting the casing C, is a diagram showing a state of being separated inner casing member C ₂ and the cover member 1. (A) is a front sectional view of the end surface portion on the P side in the conventional cooling casing C ′, and (b) is a front sectional view of the end surface portion 24 on the P side in the cooling casing C of the present embodiment. It is front sectional drawing of the end surface part 24 by the side of P in the cooling type casing C of another Example. 'Outer casing member C ₁ constituting a' conventional cooled casing C, is a diagram showing a state of being separated inner casing member C ₂ 'and the cover 53.

A: Rotating electric machine
C: Cooling casing
C ₁ : outer casing body
C ₂ : Inner casing body
D: Outer diameter
L ₀ : Required length
L ₂ : Set length
t: Wall thickness (processing area)
W: Cooling water channel (cooling medium channel)
1: Cover body
3: Stator core
4: Rotor core
14: Integrated casing part 11, 12 of the outer casing body: End face part (end face of the outer casing body)
13: Thin body part (inner peripheral surface of outer casing body)
18: Integrated casing portion of inner casing body 18a: Stepped portion (inner end surface)
19: Annular ridge
21: Spiral groove
22: Inner peripheral surface (inside of outer casing body)
23: Inner peripheral surface (inside of the integral casing portion of the inner casing body)
24: End face part (outer end face of the integral casing part)
27: Mounting bolt (bolt)
29: Female thread

Claims (2)

Consists of a outer casing body comprising a casing body, an inner casing body to be assembled together are inserted fitted inside of this outer casing body,
Configuration between the respective casing bodies a double inside and outside, Ru cooling medium passage in which the cylindrical space shape for passing a cooling medium for cooling the stator core disposed on the double casing is formed A cooling casing of the rotating electric machine of
Each of the inner and outer casing bodies is formed to be relatively thick with respect to the thin main body so that the thin main body constituting the double casing part and the mounting bolts of the cover body can be screwed together. Is composed of an integral casing portion disposed at opposite ends in the assembled state, both of which are formed shorter than the length of the casing in which the inner and outer casing bodies are integrally assembled,
Each of the inner and outer casing bodies is integrally assembled by press-fitting, and a cover body is attached to each of the integral casing portions at both ends via mounting bolts. . Connected to the inner side of the integral casing portion of the casing body, an annular protrusion which is fitted to the inner peripheral surface of the thin body portion of the outer casing body is characterized in that it is formed by a stepped The cooling-type casing of the rotary electric machine according to claim 1.

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