JP6064491B2 - Fixing structure and fixing method of stator of rotating electric machine - Google Patents

Description

The present invention relates to a structure for fixing a stator of a rotating electrical machine that drives a rotor by energizing a stator core to a housing, and a fixing method thereof .

  2. Description of the Related Art Conventionally, rotating electric machines such as a generator motor mounted on a hybrid vehicle or an electric vehicle include an inner rotor rotating magnet type in which a stator having a coil is arranged on the outer peripheral side and a rotor having a magnet is arranged on the inner peripheral side. It is used a lot. As a stator of this type, a plurality of stator pieces each having a coil wound thereon are arranged in an annular shape, and this is press-fitted and held inside the stator holder, and is attached to the housing at one end of the stator holder in the axial direction. There has been a technique related to a stator of a rotating electrical machine in which a flange is formed (Patent Document 1).

  In the rotating electrical machine disclosed in Patent Document 1, the flange extends radially outward from the outer peripheral edge of the stator holder, and a plurality of assembly holes are provided at predetermined intervals in the circumferential direction on the flange. Has been placed. After the flange is brought into contact with the boss end surface of the housing, the stator is fixed to the housing by screwing mounting bolts (fixing members) inserted through the respective assembly holes into the bosses.

JP 2005-312151 A

  However, usually, a housing of a rotating electrical machine mounted on a hybrid vehicle or the like is formed of a light metal such as an aluminum alloy for weight reduction. On the other hand, the stator holder to which the stator core is attached by press fitting or the like needs to be a magnetic body as a yoke for collecting magnetic flux. Further, in order to avoid a decrease in holding force on the stator core due to temperature change, the stator core is formed of the same material as the stator core having a small difference in thermal expansion coefficient. Therefore, the stator holder is formed of an iron-based material and is often a metal material different from the housing.

  Thereby, when a temperature change occurs in the rotating electrical machine due to Joule heat or frictional heat, a relative movement appears between the stator holder and the housing. When the temperature of the rotating electrical machine rises due to use, the housing formed of the light metal material having a large coefficient of thermal expansion extends outward in the radial direction from the stator holder. Therefore, in the stator, the boss portion of the housing moves relative to the assembly hole formed in the flange portion of the stator holder, a shear direction load acts on the mounting bolt to which the boss portion is tightened, and the flange portion There is a possibility that the mounting bolt may be loosened by rotating the head of the mounting bolt with a frictional force. In particular, after wear (fretting) occurs on the surface of the housing due to the relative movement between the flange portion and the boss portion, the axial force due to the mounting bolt (fixing member) is rapidly reduced to cause loosening.

  In this case, there is a method of preventing the loosening by increasing the screw diameter of the mounting bolt and increasing the axial force by tightening the mounting bolt. However, when the screw diameter of the mounting bolt is increased, there is a problem that the flange portion and the housing of the stator holder are enlarged, and the entire rotating electrical machine is enlarged.

  The present invention has been made in view of the above problems, and even when a shear load is generated due to a difference in thermal expansion between a stator holder for holding a stator used in a rotating electrical machine and a housing, the stator is accommodated in the housing. It aims at providing the fixing structure which fixes reliably.

In order to solve the above-described problem, the structural feature of the invention according to claim 1 is that, in a stator fixing structure of a rotating electrical machine, a ferrous metal cylindrical stator holder and an inner peripheral surface of the stator holder are provided. A stator fixing structure for a rotating electrical machine that fixes a stator including a held stator core to a light metal housing having a coefficient of thermal expansion larger than that of the iron-based metal by the stator holder, and is provided on the stator holder and is cylindrical. A flange portion extending radially outward from one edge of the housing and having a plurality of assembly holes spaced in the circumferential direction; and provided at a position facing the flange portion of the housing; a boss portion having a plurality arranged fixing holes at the position opposed to the assembly holes with an inner diameter is smaller, and the assembly hole and the fixing hole facing each other Was inserted through the front Symbol flange and a assembly pin member secured to the boss portion of said housing, said assembly pin member, said fixing hole and the expanding portion is expanded in the attachment hole, A hook portion that extends radially outward from the inner diameter of the assembly hole in a disk shape and abuts against the flange portion, and has a small diameter portion that projects outward from the flange portion and has a smaller diameter than the assembly hole. And providing.
That is.

According to a second aspect of the present invention, there is provided a structural feature of the first aspect of the present invention, wherein the housing is connected to the engine and a rotor that is disposed to face the inner periphery of the stator and rotates by energizing the stator core. An input shaft that is rotatably supported on one side wall of the housing on the same rotational axis as the rotor, and a rotary shaft that is connected to the automatic transmission and rotatably supported on the other side wall of the housing on the same rotational axis as the rotor. An output shaft, a first clutch plate provided on the inner diameter side of the rotor and provided on the input shaft, and a second clutch plate connected to the output shaft and facing the first clutch plate, And a clutch that brings the first clutch plate and the second clutch plate into a pressure-bonded state or a separated state.
A structural feature of the invention according to claim 3 is a method of fixing a stator of a rotating electrical machine, including a stator including a cylindrical stator holder made of iron-based metal and a stator core held on an inner peripheral surface of the stator holder. A stator fixing method for a rotating electrical machine, wherein the stator holder is fixed to a light metal housing having a coefficient of thermal expansion larger than that of the ferrous metal, and extends radially outward to one end edge of the cylindrical stator holder. A plurality of assembly holes are provided in the flange portion provided in the circumferential direction so as to be spaced apart from each other in the circumferential direction, and a boss portion provided at a position facing the flange portion of the housing has a smaller inner diameter than the assembly hole. A plurality of fixed holes provided opposite to the assembly holes, and rod-shaped assembly pin members for fixing the flange portion to the boss portion of the housing; At the same time as the assembly hole, an assembly pin inserting step for inserting the hit portion of the assembly pin so as to protrude from the assembly hole, and an outer diameter of the assembly hole of the flange portion on the striking surface is smaller. And a punch having a bottomed forming hole larger than the outer diameter of the assembly pin member is provided, and the hit portion protruding from the assembly hole of the assembly pin member is formed by the punch into the molding hole. The assembled pin member is expanded radially by plastic deformation in the fixed hole and the assembled hole, and the hit portion of the assembled pin member is radially expanded. And a latching portion forming step of forming a latching portion having a flange portion that is expanded in a disc shape larger than the inner diameter of the assembly hole on the outer side and abuts against the flange portion .

  According to the first aspect of the present invention, when the temperature of the rotating electrical machine rises due to the Joule heat generated by energizing the coil of the stator or the frictional heat accompanying the rotation of the rotor, the light metal housing having a large coefficient of thermal expansion is It extends radially outward from a ferrous metal stator holder having a small coefficient of thermal expansion, and generates a shear load on an assembly pin that assembles the boss portion of the housing and the flange portion of the stator holder. However, the assembly pin inserted into the assembly hole and the fixed hole is expanded radially outwardly in the assembly hole and the fixed hole by plastic deformation, and the inner periphery of the assembly hole and the outer periphery of the assembly pin The gap between is eliminated. Therefore, even if a shear load is applied, there is no relative movement between the flange portion and the boss portion, so the surface of the housing (boss portion) is worn by the flange portion and the assembly pin is loosened. There is no. With such a compact structure, even if the temperature of the rotating electrical machine rises, the stator can be securely fixed to the housing without being affected by the difference in thermal expansion coefficient between the housing and the stator holder.

  According to the invention of claim 2, the housing includes the rotor, the input shaft connected to the engine, the output shaft connected to the automatic transmission, and the clutch. In such a hybrid vehicle, since the housing is large, it is essential to reduce the weight of the housing. In order to avoid the decrease, it is essential to use a material of the same quality as the stator core having a small difference in thermal expansion coefficient. And since a stator holder continues receiving the force which acts as reaction of the rotational torque of a rotor, fixation of the stator holder with respect to a housing is always in a severe environment. The stator can be reliably fixed also in the housing in such a hybrid vehicle.

It is the schematic which shows the control system and transmission system of the driving force of the hybrid vehicle in 1st Embodiment which concern on this invention. It is sectional drawing of the driving force transmission structure for vehicles of 1st Embodiment which concerns on this invention. (1) is a plan view of the stator holder, and (2) is a sectional view taken along the line III-III of (1). It is the elements on larger scale of the fixing structure of a stator holder. It is a perspective view of the fixed part of a stator holder. It is a figure which shows the state which inserted the assembly hole of the flange part, the fixing hole of the boss | hub part, and the assembly pin. It is a figure which shows the state which performed the first impact to the assembly | attachment pin with the punch. It is a figure which shows the state which performed the 2nd hit | damage to the assembly | attachment pin with the punch, and fixed the flange part to the boss | hub part. It is the elements on larger scale of the fixing structure of the stator holder in 2nd Embodiment. It is a figure which shows the state which inserted the assembly hole of the flange part, the fixing hole of the boss | hub part, and the assembly pin. It is a figure which shows the state which performed the first impact to the assembly | attachment pin with the punch and the 2nd punch. It is a figure which shows the state which performed the 2nd hit | damage to the assembly pin with the punch and the 2nd punch, and fixed the flange part to the boss | hub part.

Example 1
A first embodiment of a stator fixing structure according to the present invention will be described with respect to an electric motor used in a hybrid vehicle having two drive sources. As shown in FIG. 1, a normally closed type clutch 6, which is a wet multi-plate clutch, is interposed between an engine (EG) 14 as a vehicle drive source and the electric motor 2. The clutch 6 connects and disconnects the connection between the engine 14 and the electric motor 2 to interrupt torque transmission. The electric motor 2 is connected in series to an automatic transmission 16 of the vehicle, and the automatic transmission 16 is connected to driving wheels of a vehicle (not shown) through a differential device (not shown). The engine 14, the electric motor 2, and the automatic transmission 16 are controlled by a control device (ECU) 7. The clutch 6 is provided with an unillustrated hydraulic circuit for operating the connection / disconnection state of the clutch 6 and an oil pump 9 for supplying hydraulic pressure to the hydraulic circuit, and an electromagnetic switching valve 11 and an oil pump provided in the hydraulic circuit. 9 is operated by the control device 7 to supply an appropriate hydraulic pressure to the clutch 6. Further, the control device 7 is connected to an electromagnetic solenoid (not shown) that operates a shift valve of the automatic transmission 16, and operates the automatic transmission based on the rotational speed of the engine 14, the vehicle speed, the shift position, and the like. Is controlling.

  An electric motor (corresponding to a rotating electric machine) 2 is a synchronous motor for driving wheels of a hybrid vehicle. However, the present invention should not be limited to this, and can be applied to any electric motor such as a motor provided in a home electric appliance or a motor for driving a general industrial machine.

  In the description, the direction of the rotational axis or the axial direction means the direction along the rotational axis CL of the rotor 4 included in the electric motor 2 and the left-right direction in FIG. In FIGS. 1 and 2, the left side may refer to the front of the electric motor 2 and the clutch 6, and the right side may be referred to as the rear, but this is not related to the actual direction on the vehicle.

  As shown in FIG. 2, the motor housing (corresponding to the housing) 8 is sealed in front by a motor cover (corresponding to one side wall of the housing) 12 with the rotor 4 and the stator 10 built-in. . The motor housing 8 is made of, for example, an aluminum alloy as a light metal.

  When the vehicle equipped with the electric motor 2 shown in FIGS. 1 and 2 is driven by the engine 14, the engine 14 rotates the drive wheels via the automatic transmission 16. When traveling by the electric motor 2, the electric motor 2 rotates the drive wheels via the automatic transmission 16. At this time, the clutch 6 is released, and the connection between the engine 14 and the electric motor 2 is released. Furthermore, the electric motor 2 is driven by the engine 14 via the clutch 6 and also functions as a generator.

  An input shaft 20 of the clutch 6 is attached to the inner peripheral end of the motor cover 12 via a bearing 18 so as to be rotatable about a rotation axis CL. The rotation axis CL is also the rotation axis of the output shaft 22 of the engine 14 and the automatic transmission 16. The input shaft 20 is connected to a crankshaft (not shown) of the engine 14 via a flywheel (not shown) and a damper for absorbing rotational vibration.

  Further, the input shaft 20 is connected to a clutch drum (clutch outer) 26 through an engaging portion 24 of the clutch 6. The engaging portion 24 includes a plurality of separate plates 28 as first clutch plates engaged with the pressing portion of the clutch drum 26, and friction as a plurality of second clutch plates engaged with the support portion of the input shaft 20. Plate 30. When the separate plate 28 and the friction plate 30 are engaged and disengaged, the input shaft 20 and the clutch drum 26 are intermittently connected.

  The clutch drum 26 is connected to the rotor 4 of the electric motor 2 and extends radially inward, and is splined to the output shaft 22 at the inner end. A double-row angular bearing 34 is interposed between the clutch drum 26 and the support wall portion 32 (corresponding to the other side wall of the housing) 32 of the motor housing 8 so that relative rotation is possible between the both. Yes.

  The rotor 4 of the electric motor 2 is rotatably attached to the motor housing 8 via a clutch drum 26. The rotor 4 includes a rotor core 39, a magnet 41, and a support member 40. The rotor core 39 is an annular member that constitutes a part of the magnetic path and that accommodates the magnet 41. The rotor core 39 is configured by laminating a plurality of laminated electromagnetic steel plates (silicon steel plates) 36, and the plurality of electromagnetic steel plates 36 are sandwiched by a pair of holding plates 38, and the support member 40 is passed through them. The end portion is formed by caulking. In the rotor core 39, a plurality of through-holes penetrating in the axial direction (front-rear direction) are formed in the circumferential direction.

  The magnet 41 is a rod-shaped member that generates magnetic flux. The magnet 41 is accommodated in the through hole of the rotor core 39. The magnet 41 is magnetized in the thickness direction of the electromagnetic steel sheet 36 so that different magnetic poles are formed alternately in the circumferential direction on the outer peripheral surface of the rotor core 39.

  A stator 10 of the electric motor 2 is attached to the inner peripheral surface of the motor housing 8 so as to face the outer periphery of the rotor 4 in the radial direction with a predetermined gap. The stator 10 is attached to the inner peripheral surface of the cylindrical portion 44 of the stator holder 42 so that a plurality of stator cores 46 for generating a rotating magnetic field are arranged in an annular shape (see FIGS. 2 and 3).

  Each stator core 46 includes a tooth 48 formed by laminating a plurality of silicon steel plates (electromagnetic steel plates). A pair of bobbins 50 and 51 are attached to the tooth 48, and the bobbins 50 and 51 are fitted to each other so as to surround the outer peripheral surface of the tooth 48. Further, a coil 52 for generating a rotating magnetic field is wound around the bobbins 50 and 51. The bobbins 50 and 51 are made of resin to insulate between the coil 52 and the stator core 46. The coil 52 includes a U-phase coil, a V-phase coil, and a W-phase coil, and these are configured by Y-connection. The coil 52 wound around the stator core 46 is connected to an external inverter via a bus ring (not shown).

  The stator holder 42 is formed by press-molding a steel plate. As shown in FIGS. 3 (1) and 3 (2), a cylindrical cylindrical portion 44 and radially outward from the axial end of the cylindrical portion 44 are provided. And three flange portions 54 extending in the vertical direction. The flange portion 54 is disposed on the circumference of the end portion of the cylindrical portion 44 so as to have a predetermined interval in order to attach the stator 10 to the motor housing 8. An outer peripheral flange 56 that is narrower than the flange portion 54 is formed between the flange portions 54.

  A pair of assembly holes 58 provided close to each other pass through the flange portion 54. The assembly holes 58 are all formed in the same diameter, and are formed at the same position in all the flange portions 54 so that all the flange portions 54 have the same shape.

  The stator core 46 is attached to the inner peripheral surface of the stator holder 42 by, for example, the following shrink fitting. First, the inner circumference is expanded by heating the stator holder 42 to a predetermined temperature. Next, the back yoke portions (not shown) of the teeth 48 are brought into contact with the cylindrical portion 44 of the heated stator holder 42, and a plurality of stator cores 46 are inserted in an annular shape. After the plurality of stator cores 46 are inserted into the cylindrical portion 44, the stator holder 42 is cooled and contracted, and each stator core 46 can be firmly held.

  Further, as a method of attaching the stator core 46 to the stator holder 42, press-fitting at normal temperature may be applied. Further, when the stator core 46 is held in the stator holder 42 by press-fitting, an adhesive may be interposed between the stator core 46 and the cylindrical portion 44 to increase the holding force.

  The stator holder 42 to which the stator core 46 is assembled is fixed to the motor housing 8 as shown in FIGS. First, the flange portion 54 is brought into contact with the boss portion 60 of the motor housing 8, and the assembly holes 58 of the flange portion 54 are respectively opposed to the plurality of fixing holes 62 provided in the boss portion 60. The fixing holes 62 of these boss portions 60 are formed in a bottomed cylindrical hole shape (step of facing the mounting holes to the fixing holes).

  Next, the rod-like assembly pin 64 is simultaneously inserted into the assembly hole 58 of the flange portion 54 and the fixing hole 62 of the boss portion 60. The assembly pin 64 is made of an iron-based material having high malleability and ductility, and is formed of, for example, S20C as carbon steel for mechanical structure. The assembly pin 64 is inserted into the assembly hole 58 in a loosely fitted state, and is pressed into the fixing hole 62 until the tip of the assembly pin 64 contacts the bottom of the fixing hole 62 by press-fitting (assembly). Step of inserting attached pin) (see FIG. 6).

  Next, the first strike is performed with the punch 66. Formed on the striking surface of the punch 66 is, for example, a forming hole 68 having an inner diameter that is 10 percent smaller than the outer diameter of the assembly hole 58 and 5 percent larger than the outer diameter of the assembly pin. The outer diameter of the assembly pin 64 is formed, for example, with a diameter tolerance for press-fitting with respect to the inner diameter of the fixed hole 62 (first impact process).

  By the first striking with the punch 66, the assembly pin 64 is plastically deformed in a short direction in the axial direction and is deformed so as to expand outward in the radial direction of the assembly pin 64 (see FIG. 7).

  Next, in the second impact, the assembly pin 64 is further expanded radially outward to generate a pressure in the direction of expansion in the fixing hole 62, and is crimped to the inner wall surface of the fixing hole 62. The gap with the inner periphery of the assembly hole 58 in the state is eliminated by expanding the assembly pin 64 radially outward. At the same time, in the hitting portion of the assembly pin 64 by the punch 66, it is expanded radially by plastic deformation in a disk shape, and the central portion of the hitting portion is recessed into the forming hole 68 of the punch 66, thereby forming a hat-like shape. The latching portion 70 is formed (the latching portion forming step) (see FIG. 8).

  In the hat-shaped hooking portion 70, the outer diameter of the collar portion 72 expanded into a hat shape is larger than the inner diameter of the assembly hole 58, and the inner surface of the collar portion 72 is a flange as shown in FIGS. The flange 72 comes into contact with the outer end surface 54 a of the portion 54 and is hooked on the outer peripheral edge 58 a of the assembly hole 58.

  In the conventional mounting bolt, the axial force is reduced due to wear of the boss portion caused by relative movement in the contact state between the flange portion and the boss portion, and the mounting bolt is loosened. Since the clearance between the assembly hole 58 of 54 and the assembly pin 64 fixed to the fixing hole 62 of the boss portion 60 is eliminated, relative movement between the flange portion 54 and the boss portion 60 does not occur. Also, unlike the mounting bolts that are fixed by generating frictional force due to axial force on the screw so as not to loosen, even if the boss portion 60 is worn, it will not loosen due to the wear. .

Next, the use state in which the stator holder 42 configured as described above is fixed to the motor housing 8 will be described below. When, for example, a three-phase alternating current is supplied to the electric motor 2 in a state where the stator holder 42 is fixed to the motor housing 8, a rotating magnetic field is generated in the stator 10, and the stator 10 is caused by an attraction force or a repulsive force caused by the rotating magnetic field. The rotor 4 rotates. Then, the stator 10 generates heat due to Joule heat generated by energizing the coil 52 of the stator 10 and frictional heat accompanying rotation of the rotor 4. At this time, the coefficient of thermal expansion between the motor housing 8 made of aluminum alloy and the stator holder 42 made of steel plate is different {for example, aluminum 23, iron 11.7 (× 10 ⁻⁶ / ° C.)}. The boss 60 extends radially outward with respect to the flange 54. Relative movement occurs between the boss portion 60 and the flange portion 54, but since the fixing pin 62 is fixed between the fixing hole 62 of the boss portion 60 and the assembly hole 58 of the flange portion 54 without a gap, the radial direction Relative movement is restricted. A shear load acts on the assembly pin 64. However, since the relative movement is restricted, the flange portion 54 with which the boss portion 60 is in contact is not worn. Further, even if the axial force is reduced due to the shear load, the fixing force is not loosened on the assembly pin 64, so that it can be reliably fixed continuously.

  As is clear from the above description, according to the fixing structure for fixing the stator 10 to the motor housing 8 in the above embodiment, due to Joule heat generated by energization of the coil 52 of the stator 10 or frictional heat accompanying rotation of the rotor, When the temperature of the rotating electrical machine (electric motor) 2 rises, the motor housing 8 made of light metal (aluminum alloy) having a large coefficient of thermal expansion is more outward in the radial direction than the stator holder 42 made of iron-based metal having a small coefficient of thermal expansion. Elongate, a shear load is generated on the assembly pin 64 that assembles the boss portion 60 of the motor housing 8 and the flange portion 54 of the stator holder 42.

  However, the assembly pin 64 inserted through the assembly hole 58 and the fixed hole 62 is expanded radially outwardly in the assembly hole 58 and the fixed hole 62 by plastic deformation, and the inner periphery of the assembly hole 58 is expanded. And the outer periphery of the assembly pin 64 are eliminated. Therefore, even when a shearing force is applied, relative movement does not occur between the flange portion 54 and the boss portion 60, so that the surface of the motor housing (boss portion 60) is not worn by the flange portion 54. Furthermore, even if the surface of the motor housing 8 is worn, the outer peripheral edge 58a of the assembly hole 58 is hooked on the outer end face of the flange portion 54 by the hooking portion 70 formed by plastic deformation. The phenomenon that the fixing of the flange portion 54 is loosened with respect to the boss portion 60 due to a decrease in fastening force unlike the mounting bolt does not occur. With such a compact structure, the stator can be securely fixed to the motor housing.

  The motor housing 8 includes a rotor 4, an input shaft 20, an output shaft 22, and a clutch 6. In such a hybrid vehicle, since the motor housing 8 is large, the motor housing 8 is required to be light in weight and is formed of a light metal material. The stator holder 42 to which the stator core 46 is attached by press-fitting or the like is a magnetic material as a yoke and is made of the same material (magnetic) as the stator core 46 having a small difference in thermal expansion coefficient in order to avoid a decrease in holding force against the stator core 46 due to temperature change. It is essential that the material is made of iron or the like. Since the stator holder 42 continues to receive a force acting as a reaction of the rotational torque of the rotor 4, the fixing of the stator holder 42 to the motor housing 8 is always in a severe environment. However, even in the motor housing 8 in such a hybrid vehicle, the stator 10 can be reliably fixed to the motor housing 8 without loosening.

(Second embodiment)
Next, a second embodiment of the stator fixing structure according to the present invention will be described below with reference to FIGS. The boss portion 60 of the motor housing 8 has a fixing hole 80 extending therethrough, and a sealing agent 84 is filled on the opposite side of the fixing hole 80 to the side where the assembly pin 64 is inserted. The fixing hole 80 on the side opposite to the side where the assembly pin 64 is inserted is covered with a cap 86 after the sealing agent 84 is filled. Since these points are different from those of the first embodiment and the other configurations are the same, descriptions with the same reference numerals are omitted.

  When the assembly pin 64 is fixed to the fixing hole 80, as shown in FIGS. 10 to 12, a second punch 82 is provided on the opposite side of the assembly pin 64 that strikes with the punch 66. In accordance with hitting 64, the assembly pin 64 is hit with the second punch 82 from the opposite side.

  First, as shown in FIG. 10, the rod-like assembly pin 64 is simultaneously inserted into the assembly hole 58 of the flange portion 54 and the fixing hole 80 of the boss portion 60. The assembly pin 64 is inserted into the assembly hole 58 in a loosely fitted state, and is inserted into the fixed hole 80 by press-fitting into the fixed hole 80. Further, the second punch 82 is disposed in the fixing hole 80 on the opposite side of the punch 66 so as to be struck (assembly pin insertion step).

  Next, as shown in FIG. At the same time, the assembly pin 64 is hit from the opposite side of the punch 66 by the second punch 82. Formed on the striking surface of the punch 66 is, for example, a forming hole 68 having an inner diameter that is 10 percent smaller than the outer diameter of the assembly hole 58 and 5 percent larger than the outer diameter of the assembly pin. The outer diameter of the assembly pin 64 is formed, for example, with a dimensional tolerance diameter for press-fitting with respect to the inner diameter of the fixed hole 80 (first impact process).

  Next, as shown in FIG. 12, the pressure in the direction of expanding in the fixing hole 80 by further expanding radially outward of the assembly pin 64 by the second hit by the punch 66 and the second punch 82. As a result, the assembly pin 64 is crimped to the inner wall surface of the fixing hole 80, and the clearance from the inner periphery of the assembly hole 58 that has been loosely fitted is expanded outward in the radial direction of the assembly pin 64. lose. At the same time, in the hitting portion of the assembly pin 64 by the punch 66, it is expanded radially by plastic deformation in a disk shape, and the central portion of the hitting portion is recessed into the forming hole 68 of the punch 66, thereby forming a hat-like shape. The latching portion 70 is formed (the latching portion forming step).

  In the present embodiment, the rigidity of the motor housing 8 is low, and even if the punch 66 from one side does not sufficiently expand the assembly pin 64 radially outward, the plasticity radially outward by the two punches 66 and 82 is obtained. Deformation can be sufficiently caused. And after removing the 2nd punch 82 of the fixing hole 80, while filling the opening of the fixing hole 80 with the sealing agent 84, and covering with the metal cap 86, as shown in FIG. The holding in the fixing hole 80 can be ensured.

  In the above embodiment, the assembly pin is a solid pin. However, the present invention is not limited to this. For example, a hollow pin may be used.

  Moreover, although the shape of the latching | locking part was made into hat shape, it is not limited to this, For example, you may form a latching part in disk shape or square disk shape.

  The housing is made of an aluminum alloy whose base material is aluminum, but is not limited to this, and may be made of a light alloy whose base material is magnesium or titanium, for example.

  Moreover, it is good also as a structure which reverses the input shaft 20 and the output shaft 22 in the said embodiment. The engine may be connected to the output shaft 22 in the above embodiment to form a new input shaft, and the input shaft 20 may be configured to rotate integrally with the rotor of the electric motor as the new output shaft.

  In addition to the planetary gear transmission generally used as a transmission, the automatic transmission according to the present invention is a continuously meshed transmission or a synchronous mesh gear transmission generally used in a manual transmission. May be.

  Moreover, although the angular bearing is a double row angular bearing, it is not limited to this, and for example, a combination of two or more single row angular bearings may be used.

  Further, although the first clutch plate is a separate plate and the second clutch plate is a friction plate, the present invention is not limited to this. For example, the first clutch plate may be a friction plate and the second clutch plate may be a separate plate.

  The present invention is not limited to the embodiment described above and shown in the drawings, and can be implemented with appropriate modifications within a range not departing from the gist.

  2 ... Electric motor, 4 ... Rotor, 6 ... Clutch, 8 ... Housing (motor housing), 10 ... Stator, 12 ... One side wall (motor cover), 14 ... Engine, 16 ... automatic transmission, 20 ... input shaft, 22 ... output shaft, 28 ... first clutch plate (separate plate), 30 ... second clutch plate (friction plate) 32 ... the other side wall (support wall), 42 ... stator holder, 46 ... stator core, 54 ... flange, 54a ... outer end face, 58 ... assembly hole, 58a ... outer peripheral edge, 60 ... boss, 62 ... fixing hole, 64 ... assembly pin, 70 ... locking part, 80 ... fixing hole, CL ... rotating shaft .

Claims (3)

Rotation of fixing a stator including a ferrous metal cylindrical stator holder and a stator core held on an inner peripheral surface of the stator holder to a light metal housing having a larger coefficient of thermal expansion than the ferrous metal by the stator holder. An electric stator fixing structure,
A flange portion provided in the stator holder, extending radially outward from one end of the tube and having a plurality of assembly holes spaced circumferentially;
A boss portion provided at a position facing the flange portion of the housing, having a smaller inner diameter than the assembly hole and having a plurality of fixing holes disposed at positions facing the assembly hole;
Together with inserted with the opposite the fixing holes and said assembly hole, the front Symbol flange and a assembly pin member secured to the boss portion of said housing,
The assembly pin member is
An expanded portion expanded within the fixing hole and the mounting hole;
A hook portion that extends radially outward from the inner diameter of the assembly hole in a disk shape and abuts against the flange portion, and has a small diameter portion that projects outward from the flange portion and has a smaller diameter than the assembly hole. When,
A structure for fixing a stator of a rotating electrical machine . The housing according to claim 1,
A rotor that is disposed to face the inner periphery of the stator and rotates by energization of the stator core;
An input shaft coupled to the engine and rotatably supported on one side wall of the housing on the same rotational axis as the rotor;
An output shaft coupled to an automatic transmission and rotatably supported on the other side wall of the housing on the same rotational axis as the rotor;
A first clutch plate provided on the inner diameter side of the rotor and provided on the input shaft; and a second clutch plate connected to the output shaft and facing the first clutch plate; A clutch that brings the second clutch plate into a crimped state or a separated state;
A structure for fixing a stator of a rotating electric machine provided with Rotation of fixing a stator including a ferrous metal cylindrical stator holder and a stator core held on an inner peripheral surface of the stator holder to a light metal housing having a larger coefficient of thermal expansion than the ferrous metal by the stator holder. An electric stator fixing method,
A plurality of assembly holes are provided in a circumferential direction in a flange portion that extends radially outward at one end edge of the cylindrical stator holder,
A boss portion provided at a position facing the flange portion of the housing is provided with a plurality of fixing holes having an inner diameter smaller than the assembly hole, facing the assembly hole,
A rod-like assembly pin member for fixing the flange portion to the boss portion of the housing is simultaneously formed in the fixing hole and the assembly hole facing each other, and the hit portion of the assembly pin is moved from the assembly hole. An assembly pin insertion process for inserting and projecting;
A punch having a bottomed forming hole formed on the striking surface that is smaller than the outer diameter of the assembly hole of the flange portion and larger than the outer diameter of the assembly pin member is provided.
The punched portion is struck in a state where the hit portion protruding from the assembly hole of the assembly pin member is fitted into the molding hole, and the assembly pin member is placed in the fixing hole and the assembly hole. A flange that expands radially outward by plastic deformation, and expands the hit portion of the assembly pin member radially outwardly in a disk shape larger than the inner diameter of the assembly hole, thereby contacting the flange portion A latch part forming step for forming a latch part with
A fixing method of a stator of a rotating electrical machine .

Images