JP2008289219A - Electric motor - Google Patents

Abstract

[PROBLEMS] To appropriately reduce the weight while preventing a decrease in operating efficiency.
A rotating mechanism capable of changing a relative phase between an inner rotor and an outer rotor, and a housing provided integrally with the inner rotor, and an outer Each pressure chamber is formed by a protrusion 47 provided in the housing 33 and provided integrally with the side rotor, and the relative phase with respect to the housing 33 is changed by the working fluid pressure introduced into each pressure chamber. The recess 33 is provided on the peripheral surface of the housing 33, the rib 71 is provided in the recess 71, and the axial end surface 33A of the housing 33 is planar.
[Selection] Figure 5

Description

  The present invention relates to an electric motor.

2. Description of the Related Art Conventionally, for example, there is known an electric motor including a rotor including an inner rotor and an outer rotor whose rotation axes are arranged coaxially and whose relative phases can be changed (see, for example, Patent Document 1).
JP 2004-72978 A

In the electric motor according to an example of the above-described prior art, the inner rotor and the outer rotor are driven by the hydraulic pressure supplied to the advance oil chamber and the retard oil chamber formed by the inner rotor support portion and the outer rotor support portion. The relative phase is changed.
By the way, in an electric motor provided with such a vane actuator, when the axial dimension of the electric motor increases, there arises a problem that the weight of the electric motor increases excessively.
For example, when an electric motor including a vane actuator is mounted on a vehicle as a drive source, if the output torque needs to be increased without increasing the radial dimension of the electric motor, the axial dimension of the electric motor is increased. . In order to suppress an excessive increase in the weight of the vane actuator due to the increase in the axial dimension of the electric motor, it is desirable to provide, for example, a lightening portion or the like in the vane actuator.
Conventionally, for example, a vane actuator that is formed by sintering, such as a vane actuator that constitutes an engine valve timing control system (VTC), the axial direction of the vane actuator when a molded product is released from a mold. In the case of performing extraction, the direction of the lightening of the lightening portion provided in the vane actuator is regulated in the axial direction, and a recess or the like is provided on the axial end surface of the vane actuator.
However, in the vane actuator according to an example of the above-described prior art, the vane efficiency changes relatively greatly according to the shape and dimensional accuracy of the axial end, and a hollow portion such as a recess is formed on the axial end surface of the vane actuator. Is provided, the equivalent orifice diameter, which is an index related to hydraulic oil leakage between the low pressure chamber and the high pressure chamber, is relatively increased, which causes a problem that the vane efficiency is lowered.

  This invention is made | formed in view of the said situation, and it aims at providing the electric motor which can perform appropriate weight reduction, preventing the fall of operating efficiency.

  In order to solve the above-described problems and achieve the object, the electric motor according to the first aspect of the present invention includes an inner peripheral side permanent magnet (for example, a peripheral shaft disposed coaxially with each other's rotation shafts disposed coaxially) The inner peripheral rotor (for example, the inner peripheral rotor 11 in the embodiment) including the permanent magnet 11a in the embodiment and the outer peripheral permanent magnet (for example, the embodiment) arranged in the circumferential direction. And the outer peripheral side rotor (for example, the outer peripheral side rotor 12 in the embodiment) and at least the inner peripheral side rotor or the outer peripheral side rotor are rotated around the rotation axis. An electric motor comprising rotating means (for example, the rotating mechanism 14 in the embodiment) capable of changing the relative phase between the inner circumferential rotor and the outer circumferential rotor. The rotating means is press-fitted into the inner peripheral portion of the inner peripheral rotor. An integrally provided housing (for example, the housing 33 in the embodiment), and a vane (for example, the protruding portion 47 in the embodiment) provided integrally with the outer peripheral rotor and provided in the housing; To form a pressure chamber (for example, the first pressure chamber 56 and the second pressure chamber 57 in the embodiment), and change the relative phase with respect to the housing by the working fluid pressure introduced into the pressure chamber ( For example, the vane rotor 32 in the embodiment, and an end plate (for example, in the embodiment) that transmits the driving force of the outer peripheral rotor to the output shaft (for example, the output shaft 16 in the embodiment). The outer peripheral rotor and the vane roller surrounded by drive plates 31, 31) being fixed to both ends of the outer peripheral rotor and the vane rotor in the axial direction. In the space between the two end plates (for example, the space 58 in the embodiment), the integral inner circumferential rotor and the housing are disposed so as to be rotatable in the circumferential direction, and the housing is recessed on the circumferential surface (for example, The recess 71) in the embodiment is provided.

  Furthermore, the electric motor which concerns on the 2nd aspect of this invention equips the said recessed part with the rib (for example, rib 72 in embodiment).

  Furthermore, in the electric motor according to the third aspect of the present invention, the axial end surface of the housing (for example, the axial end surface 33A in the embodiment) is a flat surface.

According to the electric motor according to the first aspect, the vane rotor and the housing are formed not by sintering but by, for example, casting by the lost wax method, so that the housing has a concave portion on the peripheral surface for thinning. The recesses on the peripheral surface can cause excessive weight of the vane actuator without inducing hydraulic fluid leakage between the pressure chamber on the low pressure side and the pressure chamber on the high pressure side. It is possible to prevent the increase. In addition, with the housing pressed into the inner peripheral portion of the inner rotor, the opening end of the recess on the peripheral surface of the housing bites into the inner peripheral portion of the inner rotor so that the inner peripheral rotation The frictional force between the child and the housing increases, and the occurrence of slipping can be suppressed.
Furthermore, according to the electric motor which concerns on a 2nd aspect, the rigidity of a housing can be improved by providing a rib in a recessed part.
Furthermore, according to the electric motor according to the third aspect, since the axial end surface of the housing is a flat surface, the leakage of the working fluid from the pressure chamber can be suppressed, and the inner peripheral rotor and the outer peripheral rotor The relative phase change between the two can be appropriately controlled.

Hereinafter, an embodiment of an electric motor of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 and 2, for example, the electric motor 10 according to the present embodiment includes a substantially annular inner circumferential rotor 11 provided to be rotatable about the rotation axis of the electric motor 10, and an inner circumferential side of the inner circumferential rotor 11. A substantially annular outer peripheral rotor 12 provided to be rotatable about a coaxial rotation axis on the outer side in the radial direction with respect to the side rotor 11, and in alignment with the position in the rotation axis direction; The stator 13 having the stator winding 13a shown in FIG. 1 for generating a rotating magnetic field for rotating the side rotor 11 and the outer peripheral rotor 12, and the inner peripheral rotor 11 and the outer peripheral rotor 12 are provided. A rotating mechanism (which is connected and changes the relative phase between the inner rotor 11 and the outer rotor 12 with the hydraulic pressure (fluid pressure) of hydraulic fluid (working fluid) that is an incompressible fluid ( (Rotating means) 14 and the hydraulic pressure to the rotating mechanism 14 is controlled. A brushless DC motor and a hydraulic control device for 示略.
The electric motor 10 is mounted as a drive source in a vehicle such as a hybrid vehicle or an electric vehicle, and its output shaft (rotating shaft) 16 is connected to an input shaft of a transmission (not shown). The driving force of the electric motor 10 is transmitted to driving wheels (not shown) of the vehicle via the transmission.

  When the driving force is transmitted from the driving wheel side to the electric motor 10 during deceleration of the vehicle, the electric motor 10 functions as a generator to generate a so-called regenerative braking force, and the kinetic energy of the vehicle body is used as electric energy (regenerative energy). to recover. Further, for example, in a hybrid vehicle, the rotation axis of the electric motor 10 is connected to a crankshaft of an internal combustion engine (not shown), and the electric motor 10 is used as a generator even when the output of the internal combustion engine is transmitted to the electric motor 10. Functions to generate power generation energy.

  The inner circumferential rotor 11 is arranged so that the rotation axis thereof is coaxial with the rotation axis of the electric motor 10, and has a substantially cylindrical inner circumferential rotor core 21 as shown in FIG. The inner circumferential rotor core 21 is provided with a plurality (specifically, 16 locations) of inner circumferential side magnet mounting portions 23,..., 23 at a predetermined equal pitch in the circumferential direction on the outer circumferential portion. ing. On the outer peripheral surface 21A of the inner rotor core 21, a concave groove 21a extending in parallel to the rotation axis is provided in the radial direction at a position between all the inner peripheral magnet mounting portions 23, 23 adjacent in the circumferential direction. It is formed to be recessed. The inner circumferential rotor core 21 is formed by, for example, sintering.

  Each of the inner peripheral side magnet mounting portions 23,..., 23 includes a pair of magnet mounting holes 23a, 23a penetrating the inner peripheral side rotor core 21 in parallel to the rotation axis. The pair of magnet mounting holes 23a, 23a have a substantially rectangular cross section in the direction parallel to the rotation axis, and are arranged in the same plane so as to be adjacent to each other in the circumferential direction via the center rib 23b. This plane is orthogonal to the radial line connecting the center rib 23b and the rotation axis. Each magnet mounting hole 23a, 23a is mounted with a substantially plate-like permanent magnet 11a extending parallel to the rotation axis.

The permanent magnets 11a mounted in the magnet mounting holes 23a,..., 23a are all magnetized in the same manner in the thickness direction (that is, the radial direction of the rotors 11 and 12). The pair of permanent magnets 11a, 11a mounted in the pair of magnet mounting holes 23a, 23a provided in the head 23 is set so that the magnetization directions thereof are the same. And in all the inner peripheral side magnet mounting parts 23, ..., 23, the inner peripheral side magnet mounting parts 23, 23 adjacent in the circumferential direction are mounted on a pair of permanent magnets 11a, 11a mounted on one side and the other. The paired permanent magnets 11a, 11a are set so that their magnetization directions are different from each other. That is, the inner peripheral side where the pair of permanent magnets 11a, 11a whose outer peripheral side is the S pole is mounted on the inner peripheral side magnet mounting portion 23 where the pair of permanent magnets 11a, 11a whose outer peripheral side is the N pole is mounted. The magnet mounting portion 23 is adjacent in the circumferential direction via the concave groove 21a.
As described above, the inner circumferential rotor 11 includes a plurality of permanent magnets 11a,..., 11a arranged along the circumferential direction.

The outer circumferential rotor 12 is also arranged so that its rotational axis is coaxial with the rotational axis of the electric motor 10, and has a substantially cylindrical outer circumferential rotor core 22. The outer peripheral side magnet mounting portions 24,..., 24 are provided in the outer peripheral portion at a predetermined equal pitch in the circumferential direction as many as the inner peripheral side magnet mounting portions 23,. On the outer peripheral surface 22A of the outer rotor core 22, a groove 22a extending parallel to the rotation axis is recessed in the radial direction at a position between all the outer magnet mounting portions 24, 24 adjacent in the circumferential direction. Is formed.
Further, bolts shown in FIG. 1 are inserted in positions between the inner diameter sides of the concave grooves 22a,..., 22a of the outer rotor core 22, that is, between adjacent ones of the outer magnet mounting portions 24,. A hole 22b is formed penetrating along the axial direction. The outer rotor core 22 is also formed by, for example, sintering.

  Each outer magnet mounting portion 24,..., 24 includes a pair of magnet mounting holes 24a, 24a penetrating in parallel with the rotation axis. The pair of magnet mounting holes 24a and 24a have a substantially rectangular cross section in the direction parallel to the rotation axis, and are arranged in the same plane so as to be adjacent to each other in the circumferential direction via the center rib 24b. This plane is orthogonal to the radial line connecting the center rib 24b and the rotation axis. Each magnet mounting hole 24a, 24a is mounted with a substantially plate-like permanent magnet 12a extending parallel to the rotation axis.

The permanent magnets 12a mounted in the magnet mounting holes 24a,..., 24a are all magnetized in the same manner in the thickness direction (that is, the radial direction of the rotors 11 and 12). The pair of permanent magnets 12a and 12a mounted in the pair of magnet mounting holes 24a and 24a provided in 24 are set so that the magnetization directions thereof are the same. And in all the outer peripheral side magnet mounting parts 24, ..., 24, the outer peripheral side magnet mounting parts 24, 24 adjacent in the circumferential direction are mounted on the pair of permanent magnets 12a, 12a mounted on one side and the other. The pair of permanent magnets 12a, 12a is set so that the magnetization directions are different from each other. In other words, the outer peripheral side magnet mounting portion 24 having the pair of permanent magnets 12a, 12a having the N pole on the outer peripheral side is mounted on the outer side magnet mounting having the pair of permanent magnets 12a, 12a having the S pole on the outer peripheral side. The parts 24 are adjacent to each other in the circumferential direction via the concave groove 22a.
As described above, the outer rotor 12 also includes a plurality of permanent magnets 12a, ..., 12a arranged along the circumferential direction.

  The inner peripheral magnet mounting portions 23 of the inner peripheral rotor 11 and the outer peripheral magnet mounting portions 24 of the outer peripheral rotor 12 are the diameters of the rotors 11 and 12, respectively. It arrange | positions so that it can mutually oppose in a direction. In this opposed arrangement state, all of the pair of permanent magnets 11a, 11a are in a state of being in one-to-one alignment with the corresponding pair of permanent magnets 12a, 12a. Further, each of the concave grooves 21a,..., 21a of the inner circumferential rotor 11 and each of the concave grooves 22a,. The phase in the rotational direction is in a one-to-one correspondence with the concave groove 22a.

  Thereby, according to the relative position of the inner peripheral side rotor 11 and the outer peripheral side rotor 12 around the rotation axis, the state of the electric motor 10 is changed to all the permanent magnets 11a, ..., 11a of the inner peripheral side rotor 11. In all the permanent magnets 12a,..., 12a of the outer circumferential rotor 12, the magnetic poles of the same polarity as the paired permanent magnets 11a, 11a and the paired permanent magnets 12a, 12a are opposed to each other (that is, the pair The paired permanent magnets 11a and 11a are paired with the paired permanent magnets 11a and 11a from the weakened field state shown in FIG. 2 in which the permanent magnets 12a and 12a paired with the permanent magnets 11a and 11a are paired with each other. The field in which the magnetic poles of the opposite polarities of the permanent magnets 12a and 12a are arranged opposite to each other (that is, the permanent magnets 11a and 11a that make a pair and the permanent magnets 12a and 12a that make a pair have the same polarity) and the field is strengthened most Strength shown in 4 And it is capable of setting the appropriate state over the magnetic state.

  Here, the stator 13 shown in FIG. 1 is formed in a substantially cylindrical shape facing the outer peripheral portion of the outer peripheral rotor 12, and is fixed to, for example, a housing (not shown) of a vehicle transmission.

  Next, the rotation mechanism 14 that changes the relative phase between the inner circumferential rotor 11 and the outer circumferential rotor 12 as described above will be described.

  As shown in FIG. 1, the rotation mechanism 14 according to the present embodiment includes shims 25 on the end faces 12A and 12A on both sides in the axial direction of the outer rotor 12 so as to cover the space inside the outer rotor 12. A pair of disk-shaped drive plates (end plates) 31 and 31 that are bonded and fixed together, and a vane rotor 32 that is directly provided between the drive plates 31 and 31 and provided integrally inside the outer rotor 12. , The vane rotor 32, the outer peripheral rotor 12, and the housing 33 constituting a part of the inner peripheral rotor 11 disposed between the drive plates 31 and 31. The vane rotor 32 and the housing 33 are formed by casting by the lost wax method, for example.

  In the pair of drive plates 31, 31, a plurality of bolt insertion holes 31 a,..., 31 a penetrating in the axial direction (equal to the number of bolt insertion holes 22 b) are provided at equal intervals on the same circumference. An annular groove 31b recessed in the axial direction is formed on one side inside these bolt insertion holes 31a, ..., 31a. The drive plate 31 is formed with a plurality of bolt insertion holes 31c,..., 31c penetrating in the axial direction inside the annular groove 31b so as to be equally spaced on the same circumference. Further, at the center position of the drive plate 31 that is inside the bolt insertion holes 31c,..., 31c, a cylindrical portion 31d that protrudes in a cylindrical shape along the axial direction is formed on the same side as the formation side of the annular groove 31b. The inside is a central hole 31e penetrating in the axial direction. In addition, as shown in FIG. 3, the drive plate 31 is slightly shifted to the axial center side from the bolt insertion holes 31a,..., 31a, and the through holes 31f,. It is formed to open. Here, all of these through holes 31f,..., 31f are formed at positions (specifically, center positions) between adjacent bolt insertion holes 31a, 31a.

  The pair of shims 25, 25 has an annular shape as a whole, and has a stepped shape in the axial direction from the entire circumference of the annular flat plate portion 26 orthogonal to the central axis and the inner peripheral edge of the flat plate portion 26. And a bead (bent portion) 27 that is bent inwardly and extends inward, and the flat plate portion 26 has a plurality of bolt insertion holes 26a (a same number as the bolt insertion holes 31a) penetrating in the axial direction. , 26a are formed at equal intervals on the same circumference. Here, the bead 27 is a so-called half bead having a step shape from the flat plate portion 26 to one side in the axial direction, specifically, an annular tapered plate portion 27a extending obliquely inward from the flat plate portion 26; The taper plate portion 27a has an annular inner end plate portion 27b extending inward from the inner peripheral edge of the taper plate portion 27a in parallel with the flat plate portion 26. When the bead 27 is sandwiched between the drive plate 31 and the outer rotor 12, the bead 27 is deformed into the same flat plate shape as the flat plate portion 26 as a whole, and these drive plates are caused by the elastic force generated at that time. 31 and the outer peripheral rotor 12 are in close contact with each other to seal these gaps. In addition, you may employ | adopt what is called a full bead which makes a step shape in the axial direction both sides.

  As shown in FIGS. 2 and 5, the vane rotor 32 includes a cylindrical boss portion 35 and a plurality of the above-described bolts extending outward in the radial direction from circumferentially equidistant positions on the outer peripheral surface of the boss portion 35. The number of blade portions 36,..., 36 is the same as the number of insertion holes 31c (specifically, six locations).

  On both sides in the axial direction of the boss portion 35, a fitting base portion 37 having the same axial length as the blade portions 36,... 36 is recessed on the outer peripheral side in a stepped shape inwardly in the axial direction from the sandwiching base portion 37. 38 has a shape formed on the inner peripheral side. A connecting spline 35b shown in FIG. 1 is formed on the inner diameter side of the boss portion 35 in the axial direction intermediate position, and each vane portion is arranged on one side in the axial direction from the connecting spline 35b as shown in FIG. Passage holes 35c,..., 35c are formed penetrating on the same side in the rotational direction of the proximal end of the blade portion 36 closest to the inner peripheral side of the position of 36,. On the opposite side, passage holes 35d,..., 35d are formed penetrating on the same opposite side in the rotational direction of the proximal end of the blade part 36 closest to the inner peripheral side of the position of each blade part 36,. .

  As shown in FIG. 1, an output shaft 16 to which the driving force of the outer rotor 12 is transmitted is attached to the inner diameter side of the vane rotor 32. The output shaft 16 is connected to a spline 16a for connection to the connection spline 35b of the boss part 35, and an annular communication for connecting all the passage holes 35c of the boss part 35 in a state of being connected by the connection spline 16a. It has a groove 16b, an annular communication groove 16c that allows all the passage holes 35d to communicate with each other in the same state, and seal grooves 16d,..., 16d formed at both outer positions of the communication grooves 16b, 16c. These seal grooves 16d,..., 16d are provided with seal rings (not shown) that seal the gaps with the vane rotor 32, respectively. The output shaft 16 has a passage hole 16e for supplying and discharging hydraulic oil to and from the communication groove 16b through the inside, and a passage hole 16f for supplying and discharging hydraulic oil to and from the communication groove 16c. Is formed. The output shaft 16 has a bearing fitting portion 16g for fitting, for example, a pair of bearings 42, 42 held in a housing of a vehicle transmission to a portion protruding outward in the axial direction from the drive plates 31, 31. Are formed, and a gear 43 for transmitting the rotation of the output shaft 16 is splined to the drive plate 31 side of one bearing fitting portion 16g.

  Each of the blade portions 36,... 36 has a substantially plate shape, and a screw hole 36a penetrating in the axial direction is formed at an intermediate position as shown in FIG. A pair of concave portions 36b and 36b are formed on both sides in the circumferential direction over the entire length in the axial direction on the outer peripheral side from the position where the screw hole 36a is formed, and the position where the screw hole 36a is formed The concave portions 36c and 36c are also formed on the inner side over the entire length in the axial direction. Furthermore, a seal holding groove 36d that is recessed from the outer peripheral surface toward the center side is formed on the outer peripheral surface of each blade portion 36,... 36 over the entire length in the axial direction. In the seal holding grooves 36d,..., 36d, spring seals 44 that seal the gaps with the housing 33 are arranged. Each of the spring seals 44,..., 44 includes a seal 44a that is provided on the outer side and that is in sliding contact with the housing 33, and a spring 44b that is provided on the inner side and presses the seal 44a toward the housing 33 radially outward. Yes.

  The inner circumferential rotor 11 includes a ring-shaped inner circumferential rotor body 34 configured by mounting permanent magnets 11a, ..., 11a on the inner circumferential rotor core 21, and the inner circumferential rotor body. A housing 33 is integrally fitted inside 34 so as to have a predetermined phase relationship. A housing 33 that constitutes a part of the inner circumferential rotor 11 includes a cylindrical base portion 46 having a small radial thickness, and a radially inner position from a circumferentially equidistant position on the inner circumferential surface of the base portion 46. , 47 having the same number as the blade portion 36. Here, as shown in FIG. 1, the base portion 46 protrudes over the entire circumference on both sides in the axial direction from the protruding portion 47 and the inner circumferential rotor body 34. As shown in FIGS. 2 and 5, each protrusion 47,..., 47 has a substantially isosceles triangular shape that is tapered when viewed in the axial direction, and in all the protrusions 47,. The accommodating part 48 which can arrange | position the blade | wing part 36 of the vane rotor 32 mentioned above between each protrusion part 47 and 47 adjacent to the circumferential direction is formed. Each of the projecting portions 47,..., 47 is formed with a seal holding groove 47b that is recessed toward the outer diameter side on the inner end surface thereof over the entire length in the axial direction. In these seal holding grooves 47b,..., 47b, spring seals 50 for sealing the gap with the outer peripheral surface of the boss portion 35 of the vane rotor 32 are arranged. These spring seals 50,..., 50 are provided on the inner peripheral side and are in contact with the boss portion 35 of the vane rotor 32, and the seal spring 50b is provided on the outer diameter side and presses the seal 50a toward the vane rotor 32. It consists of and. The housing 33 may be integrally connected to the inner circumferential rotor body 34 by fastening bolts or the like.

As shown in FIG. 5, a plurality of recesses 71,... 71 extending in the rotation axis direction are provided on the peripheral surface of the housing 33, and each recess 71 is radially inward from the inner peripheral surface of the base portion 46. It is formed so as to be recessed toward the inside of the projecting portion 47 projecting toward the surface.
Further, in each recess 71, a rib 72 provided between inner wall surfaces facing each other in the circumferential direction of each recess 71 is disposed at a predetermined position in the rotation axis direction.
The axial end surface 33A of the housing 33 is formed in a flat shape.

The housing 33 provided with the recess 71 on the peripheral surface is not sintered but is formed, for example, by casting by the lost wax method.
That is, for example, when it is necessary to increase the output torque with respect to the electric motor 10 mounted on the vehicle as a drive source and the increase in the radial dimension of the electric motor 10 is restricted, The axial dimension will be increased. And in order to suppress the excessive increase in the weight of the rotation mechanism 14 accompanying the increase in the axial direction dimension of the electric motor 10, the hollow part is provided in the housing 33 of the rotation mechanism 14 which comprises a vane actuator.
Conventionally, for example, a vane actuator shaft formed when a molded product is punched out of a mold with respect to a vane actuator formed by sintering, such as a vane actuator constituting a valve timing control system (VTC) of an internal combustion engine. When extracting in the direction, the direction of the lightening of the lightening part provided in the vane actuator is restricted to the axial direction, and, for example, as in the comparative example shown in FIG. Will be provided.
However, in the rotation mechanism 14 according to the comparative example shown in FIG. 6, the vane efficiency changes relatively greatly according to the shape and dimensional accuracy of the axial end, and the recess 81 is formed on the axial end surface 33 </ b> A of the housing 33. In the case of providing a lightening portion such as a relatively large equivalent orifice diameter, which is an index related to hydraulic oil leakage between the low pressure side pressure chamber and the high pressure side pressure chamber, the vane efficiency decreases. Problem arises.
On the other hand, in the rotating mechanism 14 according to the present embodiment shown in FIG. 5, the housing 33 is not sintered but is formed by, for example, casting by the lost wax method. Without being limited to 33 </ b> A, a recess 71 can be provided on the peripheral surface of the housing 33 for removing the thickness.
As a result, the weight of the rotating mechanism 14 increases excessively without inducing hydraulic fluid leakage between the low pressure side pressure chamber and the high pressure side pressure chamber of the vane actuator constituting the rotating mechanism 14. This can be prevented. Further, in the state where the housing 33 is press-fitted into the inner peripheral portion of the inner peripheral side rotor 11, the opening end of the concave portion 71 on the peripheral surface of the housing 33 bites into the inner peripheral portion of the inner peripheral side rotor 11. The frictional force between the inner circumferential rotor 11 and the housing 33 increases, and the occurrence of slipping can be suppressed.

  The axial length of the outer peripheral rotor 12 is set to be shorter than the axial lengths of the vane portion 36 and the sandwiching base portion 37 of the vane rotor 32 even if a maximum allowable manufacturing error occurs. At the time of assembly, the actual axial length of the outer rotor 12 and the axial lengths of the vane rotor 36 and the clamping base 37 of the vane rotor 32 are measured.

  When assembling each component, first, for example, the axial length of the actual product of the outer rotor 12 measured as described above, the axis of the vane rotor 36 and the sandwiching base portion 37 of the actual product of the vane rotor 32 are used. Two shims 25 having a thickness that is half the difference from the direction length are selected from a plurality of types having different thicknesses prepared in advance.

  Next, by inserting the cylindrical portion 31d of one drive plate 31 into one fitting portion 38 of the vane rotor 32, the bolts of the drive plate 31 are inserted in a state where the drive plate 31 and the vane rotor 32 are combined. Bolts 54 are inserted into the holes 31c,..., 31c, respectively, and the bolts 54,..., 54 are respectively screwed into the screw holes 36a of the blade portion 36 of the vane rotor 32. Then, with the spring seals 44 attached to the blades 36,... 36 of the vane rotor 32, the blades 36,. The inner circumferential rotor 11 formed by press-fitting the housing 33 inside the circumferential rotor body 34 is aligned with one drive plate 31 with the spring seals 50,. Then, after aligning the end surface 12A of the outer peripheral rotor 12 with one drive plate 31 through the shim 25 so as to cover the outer side of the inner peripheral rotor 11, the end surface 12A on the opposite side of the outer peripheral rotor 12 is provided. Also, the shim 25 is arranged, and the other drive plate 31 is aligned from the opposite side by fitting the other fitting portion 38 of the vane rotor 32 into the center hole 31e, and each bolt insertion hole of the drive plate 31 is fitted. 31a, the bolt insertion holes 26a, ..., 26a of the shim 25, the bolt insertion holes 22b, ..., 22b of the outer rotor 12, the bolt insertion holes 26a, ..., 26a of the shim 25, and the above , 31a is inserted into each bolt insertion hole 31a,..., 31a of one drive plate 31, and a nut 53 is screwed into each bolt 52,. . Further, the bolts 54 are inserted into the bolt insertion holes 31c,..., 31c of the other drive plate 31, respectively, and the bolts 54,..., 54 are respectively screwed into the screw holes 36a of the blade portion 36 of the vane rotor 32.

  Here, the above-described bolt 52 and nut 53 are provided around the bolt insertion hole 31 a of one drive plate 31, the bolt insertion hole 26 a of one shim 25, and the bolt insertion hole 22 b of the outer rotor 12. A bolt fastening portion 63 for fastening the peripheral portion, the peripheral portion of the bolt insertion hole 26a of the other shim 25 and the peripheral portion of the bolt insertion hole 31a of the other drive plate 31 is configured. It is formed at predetermined intervals along the circumferential direction. Then, by fastening these bolt fastening portions 63,..., 63, both shims 25, 25 are connected to the drive plate 31 by an annular bead 27 on the axial center side of each bolt fastening portion 63,. It is sandwiched between the outer circumferential rotor 12 and deformed into a flat plate shape as a whole, and the drive plate 31 and the outer circumferential rotor 12 are brought into close contact with each other by a restoring force to seal these gaps. The through holes 31f, ..., 31f of the drive plate 31 are formed between the adjacent bolt insertion holes 31a, 31a in the circumferential direction (specifically, at the center position) as described above. It is formed between adjacent bolt fastening portions 63 and 63 inserted through the matching bolt insertion holes 31a and 31a (specifically, at the center position) (see FIG. 2).

  As described above, the drive plates 31, 31 fixed to the both axial end surfaces of the outer rotor 12 are integrally fixed by the vanes 36,..., 36 of the vane rotor 32 and the bolts 54,. The bolts 54,..., 54 for fixing the blade portions 36,... 36 to the drive plate 31 are smaller in number and size than the bolts 52,. A large one is used.

  Thereafter, the output shaft 16 is fitted inside the vane rotor 32, and at that time, the connecting spline 16a and the connecting spline 35b are coupled. As a result, the output shaft 16 is fixed to the vane rotor 32 integrally. Of course, the above assembling procedure is an example, and it is possible to assemble in a procedure different from the above.

  As described above, the inner circumferential rotor 11 configured by integrating the housing 33 and the inner circumferential rotor body 34 is located inside the outer circumferential rotor 12 and outside the vane rotor 32 and on the drive plates 31, 31. Is provided in the space 58 between them, and is held rotatably at both side portions in the axial direction of the base portion 46 entering the annular grooves 31b, 31b of the drive plates 31, 31. Furthermore, the blade | wing part 36 of the vane rotor 32 is arrange | positioned 1 each in each accommodating part 48, ..., 48 of the housing 33. FIG. Further, the output shaft 16 that is spline-coupled to the vane rotor 32 can rotate integrally with the outer peripheral rotor 12, the drive plates 31, 31, and the vane rotor 32, and specifically, is fixed integrally. Note that the inner circumferential rotor 11 can be rotated with respect to the outer circumferential rotor 12 and the drive plates 31, 31 that are integrally provided, so that both end surfaces in the axial direction are opposed to the drive plate 31. A gap 59 can be formed between the outer peripheral surface 21A and the outer peripheral surface 21A. The shims 25, 25 interposed between the both end faces 12A, 12A of the outer rotor 12 and the drive plates 31, 31 are formed within the range of the end face 12A of the outer rotor 12, respectively. Thus, it does not extend to the region of the gap 60 between the outer circumferential rotor 12 and the inner circumferential rotor 11. Further, the through holes 31f,..., 31f of the drive plate 31 are located on the side of the gap 60 so as to open to the gap 60 on the axial center side of the shim 25, specifically, the gap 60 along the central axis direction. It is formed on the extension line.

  Here, when the permanent magnets 12a,..., 12a of the outer peripheral rotor 12 and the permanent magnets 11a,. In this way, all the blade portions 36,..., 36 are brought into contact with the protruding portions 47 adjacent on the same side in the rotational direction in the corresponding accommodating portions 48, and the first protruding portion 47 is in contact with the protruding portions 47 in contact with each other. The pressure chamber 56 is formed, and a second pressure chamber 57 wider than the first pressure chamber 56 is formed between the protrusions 47 adjacent to each other on the same opposite side in the rotation direction (in other words, accommodating) 48 and the blade portions 36 accommodated in the accommodating portions 48,..., 48 form first pressure chambers 56,..., 56 and second pressure chambers 57,. . As a result, the first pressure chambers 56,..., 56 and the second pressure chambers 57,... 57 are defined inside the inner circumferential rotor 11.

  On the contrary, when the permanent magnets 12a,..., 12a of the outer peripheral rotor 12 and the permanent magnets 11a,. Thus, all the blade portions 36,..., 36 are brought into contact with the projecting portions 47 adjacent to the same opposite side in the rotation direction in the corresponding accommodating portions 48 to reduce the second pressure chambers 57, Each expands the first pressure chamber 56 between the protrusions 47 adjacent to the same one side in the rotation direction. The passage holes 35c,..., 35c of the vane rotor 32 are provided in the first pressure chambers 56,..., 56 so as to always open one-to-one, and the vane rotor 32 is provided in the second pressure chambers 57,. Each of the passage holes 35d,..., 35d is provided so as to always open one-on-one.

  Here, the outer circumferential rotor 12 and the inner circumferential rotor 11 are made of the strong field shown in FIG. 4 in which the permanent magnets 12a,..., 12a and the permanent magnets 11a,. The positions are set to the origin positions when the first pressure chambers 56,..., 56 and the second pressure chambers 57,. The first pressure chambers 56,..., 56 and the second pressure chambers 57,. Then, from this state of the origin, hydraulic oil is introduced into each first pressure chamber 56,..., 56 through each passage hole 35c,. When the hydraulic oil is discharged from the second pressure chambers 57,..., 57 through the passage holes 35d,..., 35d at the same time, the outer circumferential rotor 12 and the inner circumferential rotor 11 are Relative rotation against the magnetic force causes a field weakening state. Conversely, hydraulic oil is introduced into the second pressure chambers 57,..., 57 through the passage holes 35d,..., 35d, and at the same time, the passage holes 35c,. When the hydraulic oil is discharged through the outer circumferential rotor 12, the outer circumferential rotor 12 and the inner circumferential rotor 11 return to the origin position and enter a strong field state. At this time, the permanent magnet 12 a of the outer circumferential rotor 12 is used. ,..., 12a and the permanent magnets 11a,..., 11a of the inner rotor 11 are attracted by magnetic force, so that the pressure of the hydraulic oil introduced into the second pressure chambers 57,. The pressure may be lower than that required when the phase is changed to the field-weakening state, and in some cases, only supply and discharge of hydraulic oil is required without introducing hydraulic pressure.

  Here, the electric motor 10 starts from the weakened state in which the inner circumferential rotor 11 has the permanent magnets 12a,..., 12a and the permanent magnets 11a,. The direction of rotation when returning to the position coincides with the direction of the moment of inertia that occurs during decelerating rotation. That is, the electric motor 10 is set so as to rotate the outer circumferential rotor 12 and the inner circumferential rotor 11 in the clockwise direction in FIGS. 2 and 4 when the vehicle travels forward. When the outer rotor 12 is decelerated from the magnetic state, an inertia moment is generated in the inner rotor 11 in the floating state to return to the strong field state shown in FIG.

  Here, since the hydraulic oil is incompressible, the phase change to both limit ends of the strong field state and the weak field state as described above is of course an intermediate position between these limit ends. However, the hydraulic control device (not shown) supplies and discharges hydraulic fluid from all the first pressure chambers 56,..., 56 and the second pressure chambers 57,. By stopping, the outer circumferential rotor 12 and the inner circumferential rotor 11 maintain the phase relationship at that time, and the phase change can be stopped in an arbitrary field state.

  As described above, the vane rotor 32 described above is integrally fixed to the outer circumferential rotor 12 and can rotate integrally, and is disposed inside the inner circumferential rotor 11. Moreover, the vane rotor 32 is connected to the outer rotor 12 via drive plates 31 and 31 fixed to the outer rotor 12 so as to cover both end faces of the outer rotor 12 and the inner rotor 11 in the axial direction. And an output shaft 16 that outputs the driving force of the outer rotor 12 is also provided integrally. Further, the housing 33 is integrally fitted to the inner circumferential rotor body 34 so as to be able to rotate integrally, and the housing portion 48 forms the first pressure chamber 56 and the second pressure chamber 57 with the vane rotor 32. The inner periphery side rotor 11 is defined inside. Further, the relative phase of the vane rotor 32 with respect to the housing 33 is changed by supplying and discharging the hydraulic oil to and from the first pressure chamber 56 and the second pressure chamber 57, that is, the introduction control of the hydraulic pressure. The relative phase between the child 11 and the outer peripheral rotor 12 is changed. Here, the relative phase between the inner circumferential side rotor 11 and the outer circumferential side rotor 12 can be changed to the advance side or the retard side by at least 180 ° of the electrical angle, and the state of the electric motor 10 is A field-weakening state in which the same magnetic poles of the permanent magnet 11a of the inner rotor 11 and the permanent magnet 12a of the outer rotor 12 are arranged to face each other, and the permanent magnet 11a and outer periphery of the inner rotor 11 It is possible to set an appropriate state between the strong magnetic field state in which the magnetic poles of different polarities with respect to the permanent magnet 12a of the side rotor 12 are arranged to face each other.

  In addition, these outer peripheral rotors surrounded by drive plates 31 that transmit the driving force of the outer peripheral rotor 12 to the output shaft 16 are fixed to both end surfaces in the axial direction of the outer peripheral rotor 12 and the vane rotor 32, respectively. 12, the inner circumferential rotor 11 in which the inner circumferential rotor body 34 and the housing 33 are integrated in the space 58 shown in FIG. 2 between the vane rotor 32 and the drive plates 31 and 31 is rotatable in the circumferential direction. Is arranged. The inner circumferential rotor 11 in which the inner circumferential rotor body 34 and the housing 33 are integrated is rotatably provided in the space 58 in a floating state (that is, the drive plates 31 and 31 and the output shaft). 16 is not fixed).

  For example, as shown in FIG. 7A, a strong field state in which the permanent magnet 11a of the inner rotor 11 and the permanent magnet 12a of the outer rotor 12 are arranged in the same polarity, for example, FIG. In the field-weakening state in which the permanent magnet 11a of the inner rotor 11 and the permanent magnet 12a of the outer rotor 12 are arranged in a counter electrode as shown in FIG. 8B, for example, as shown in FIG. Since the magnitude of the voltage changes, the induced voltage constant Ke is changed by changing the state of the electric motor 10 between the strong field state and the weak field state.

As described above, according to the electric motor 10 according to the present embodiment, the vane rotor 32 and the housing 33 are not sintered but are formed by, for example, casting by the lost wax method, so that the housing 33 is formed on the circumferential surface. A recess 71 for removing can be provided, and the recess 71 on the peripheral surface induces hydraulic oil leakage between the pressure chamber on the low pressure side and the pressure chamber on the high pressure side of the vane actuator forming the rotation mechanism 14. Without this, it is possible to prevent the weight of the rotation mechanism 14 from excessively increasing. Further, in the state where the housing 33 is press-fitted into the inner peripheral portion of the inner peripheral side rotor 11, the opening end of the concave portion 71 on the peripheral surface of the housing 33 bites into the inner peripheral portion of the inner peripheral side rotor 11. The frictional force between the inner circumferential rotor 11 and the housing 33 increases, and the occurrence of slipping can be suppressed.
Further, by providing the recess 72 with the rib 72, it is possible to ensure a desired rigidity for the housing 33.
Further, since the axial end surface 33A of the housing 33 is planar, leakage of hydraulic oil from the pressure chambers 56 and 57 can be suppressed, for example, and the inner circumferential rotor 11 and the outer circumferential rotor 12 The relative phase change between the two can be appropriately controlled by hydraulic pressure.

It is principal part sectional drawing which shows the electric motor which concerns on one Embodiment of this invention. It is a front view which abbreviate | omitted the near drive plate which shows the field-weakening state of the inner peripheral side rotor of an electric motor which concerns on one Embodiment of this invention, an outer peripheral side rotor, and a rotation mechanism. It is the elements on the outer peripheral side of the electric motor which concern on one Embodiment of this invention, and the bolt fastening part periphery of a drive plate before (a) assembly | attachment, and the partial expanded sectional view after (b) assembly | attachment. It is a front view which abbreviate | omitted the near drive plate which shows the strong field state of the inner peripheral side rotor of an electric motor which concerns on one Embodiment of this invention, an outer peripheral side rotor, and a rotation mechanism. It is a principal part disassembled perspective view of the rotation mechanism of the electric motor which concerns on one Embodiment of this invention. It is a principal part disassembled perspective view of the rotation mechanism of the electric motor which concerns on the comparative example of one Embodiment of this invention. FIG. 7A is a diagram schematically showing a strong field state in which the permanent magnets of the inner circumferential rotor and the permanent magnets of the outer circumferential rotor are arranged in the same polarity, and FIG. It is a figure which shows typically the field-weakening state by which the permanent magnet of the side rotor and the permanent magnet of the outer peripheral side rotor were arrange | positioned with a counter electrode. It is a graph which shows the induced voltage in the strong field state and weak field state shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electric motor 11 Inner peripheral side rotor 11a Permanent magnet (Inner peripheral side permanent magnet)
12 Outer peripheral rotor 12a Permanent magnet (outer peripheral permanent magnet)
14 Rotating mechanism (rotating means)
16 Output shaft 31 Drive plate (end plate)
32 Vane rotor 33 Housing 33A Axial end face 47 Projection (vane)
56 First pressure chamber (pressure chamber)
57 Second pressure chamber (pressure chamber)
58 space 71 recess 72 rib

Claims (3)

An outer peripheral side rotor having an inner peripheral side rotor having an inner peripheral side permanent magnet disposed in the circumferential direction and an outer peripheral side permanent magnet disposed in the circumferential direction, the rotation axes of which are arranged coaxially. ,
Rotation capable of changing the relative phase between the inner circumferential rotor and the outer circumferential rotor by rotating at least the inner circumferential rotor or the outer circumferential rotor about the rotation axis. An electric motor comprising means,
The rotating means is a pressure chamber formed by a housing press-fitted into an inner peripheral part of the inner peripheral rotor and a vane provided integrally with the outer rotor and provided in the housing. And a vane rotor that changes a relative phase with respect to the housing by a working fluid pressure introduced into the pressure chamber,
The outer peripheral rotor, the vane rotor, and both ends surrounded by the end plates that transmit the driving force of the outer peripheral rotor to the output shaft being fixed to both axial ends of the outer peripheral rotor and the vane rotor. In the space between the plates, the integral inner rotor and the housing are arranged so as to be rotatable in the circumferential direction,
The electric motor according to claim 1, wherein the housing includes a concave portion on a peripheral surface. The electric motor according to claim 1, wherein the recess includes a rib. The electric motor according to claim 1, wherein an axial end surface of the housing is a flat surface.

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