JP4284076B2 - Rotating electrical machine unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotating electrical machine unit having a rotating electrical machine, a sensor for detecting rotation of the rotating electrical machine, and a housing case provided with the sensor.
[0002]
[Prior art]
Some conventional rotating electrical machine units employ a resolver as a sensor for detecting the rotation of the rotating electrical machine. As a resolver mounting structure, a technique has been proposed in which a resolver stator is fitted into a concave portion of a housing case formed in an annular shape and fixed with a bolt (for example, see Patent Document 1).
[0003]
As another resolver mounting structure, a technique has been proposed in which a stator holder that holds a resolver stator inside is provided, and the stator holder is fixed to a housing case (for example, see Patent Document 2). According to this technique, the resolver can be fixed with a small number of parts, which is preferable.
[0004]
[Patent Document 1]
JP 2001-78393 A (paragraph [0021])
[Patent Document 2]
JP 2002-136055 A (paragraphs [0017] to [0020])
[0005]
[Problems to be solved by the invention]
By the way, in order to reduce the cost and improve the production efficiency of the rotating electrical machine unit, it is preferable to reduce the number of parts and the time required for the sensor mounting process.
[0006]
In the techniques disclosed in Patent Document 1 and Patent Document 2 described above, the sensor is fixed with bolts, so that the number of parts is more than the number of bolts and it takes time to tighten the bolts. In addition, it is necessary to process a bolt hole into which the bolt is screwed in the housing.
[0007]
The present invention has been made in consideration of such problems, and an object of the present invention is to provide a rotary electric machine unit that can reduce the number of parts and the number of assembly steps, has high production efficiency, and is inexpensive.
[0008]
[Means for Solving the Problems]
A rotating electrical machine unit according to the present invention includes a rotating electrical machine, a sensor that includes a projecting portion extending in an axial direction on an outer periphery, detects a rotation angle of the rotating electrical machine, and a housing case that includes the sensor. The housing case has a mounting hole into which the sensor is inserted. The mounting hole extends in the axial direction and has a recess into which the projection is inserted. even slightly longer, said end surface around the recess at the inlet side of the mounting hole to form a deformed portion that bulges inwardly of the recess by plastic working crushing by punches, to fix the sensor by the modified form unit It is characterized by.
[0009]
As described above, the sensor can be fixed to the housing case by inserting the sensor into the mounting hole and plastically deforming the concave portion in a state in which the protrusion is fitted in the concave portion. In addition, the number of assembly steps can be reduced to improve production efficiency, and the rotating electrical machine unit can be made inexpensive because no mounting parts are required. The protrusion and the recess may have a semicircular cross section.
[0010]
The rotating electrical machine unit according to the present invention includes a rotating electrical machine, a sensor that detects the rotational angle of the rotating electrical machine, and a thin flat member that includes a first recess extending in the axial direction on the outer periphery. A housing case to which the sensor is attached by a member, and the housing case is provided with a mounting hole into which the sensor is inserted, and a second extending in the axial direction provided around the inlet side of the mounting hole. An annular wall having a recess on the inner periphery, the mounting member is annular, has a width that fits into the first recess, an inwardly extending portion that goes diagonally inward, and the second recess And an outwardly extending portion that extends obliquely outward in the opening side direction of the housing case with reference to the periphery of the inlet side of the mounting hole as a reference , and the inner portion in the first recess of the sensor. A direction extending portion is fitted, and the second recessed portion By extending portion is press-fitted, characterized in that the sensor is fixed.
[0011]
Thus, if a sensor is fixed using the attachment member which has an outward extension part and an inward extension part, an assembly man-hour can be reduced and production efficiency can be improved. Further, since other parts for mounting are unnecessary, the rotary electric machine unit can be made inexpensive. Furthermore, it is not necessary to deform the housing, and the sensor can be replaced. The inward extending portion may extend in a direction in which the inward extending portion is inserted into the mounting hole with reference to a periphery of the inlet side of the mounting hole.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, two preferred embodiments of the rotating electrical machine unit according to the present invention will be described and described with reference to the accompanying FIGS.
[0013]
As shown in FIG. 1, the rotating electrical machine unit 10 according to the first embodiment includes a rotating electrical machine 12 that acts as a motor or a generator, bearings 16 and 18 that indicate a rotating shaft 14 of the rotating electrical machine 12, A resolver (sensor) 20 that detects a rotation angle of the rotary shaft 14 and a metal housing case 22 are provided.
[0014]
The housing case 22 has a cup shape that is slightly larger than the rotating electrical machine 12, and is mounted with the rotating electrical machine 12, the bearings 16 and 18, and the resolver 20.
[0015]
The resolver 20 is provided in the bottom mounting hole 24 inside the housing case 22, and one end of the rotating shaft 14 is connected to the resolver rotor 26 of the resolver 20. The other end of the rotating shaft 14 protrudes from the housing case 22, and transmits driving force to other devices, or driving force is transmitted. The rotating electrical machine 12 can rotate or generate power by the electromagnetic action of the stator core 28 and the magnet 30.
[0016]
As shown in FIG. 2, the resolver 20 has sin (t) and cos (t) on the pair of primary windings 34 and 36 so that the opposite pole portions of the stator 32 are in reverse-phase direct connection, respectively. Apply AC voltage. Here, t is a time variable. Thus, a magnetic path is formed between the pole portion of the stator 32 and the eccentric resolver rotor 26.
[0017]
Another secondary coil is wound around each pole portion of the stator 32, and the secondary coils are combined to form a secondary circuit 38.
[0018]
When the rotating shaft 14 (see FIG. 1) rotates the resolver rotor 26, the gap between the resolver rotor 26 and the stator 32 changes, so that the secondary circuit 38 responds to the actual rotation angle θ on the same principle as the transformer coupling. Induced voltage (K · sin (t−δ)) is generated. Here, K is a proportionality constant, and δ is a phase difference.
[0019]
The phase difference detection unit 40 compares the induced voltage Ksin (t−δ) generated in the secondary circuit 38 with the voltage applied to the primary windings 34 and 36 and obtains the phase difference δ by digital counting. Further, the phase difference detection unit 40 can obtain the actual rotation angle θ of the resolver rotor 26 from the phase difference δ and output it as the output signal θ0. Note that the block diagram shown in FIG. 2 is simplified, and the number of poles is different from the actual resolver 20.
[0020]
As shown in FIG. 3, the stator 32 of the resolver 20 has a cylindrical shape having five protrusions 42 extending in the axial direction on the outer periphery, and is configured by laminating a plurality of steel plates. The cylindrical mounting hole 24 to which the resolver 20 is mounted is provided with five concave portions 44 into which the protruding portions 42 are inserted. The axial length of the recess 44 is set slightly longer than the width of the resolver 20. The protrusions 42 are set in the same arrangement as the arrangement of the recesses 44.
[0021]
Next, a method for assembling the rotating electrical machine unit 10 configured as described above will be described.
[0022]
First, as shown in FIG. 4, the resolver 20 is inserted into the mounting hole 24 while the protrusion 42 is aligned with the recess 44. Since the length of the concave portion 44 is slightly longer than the width of the resolver 20, there is a step having a minute width d between the end surface 20 a of the resolver 20 and the edge surface 46 that is the inlet portion of the mounting hole 24. At this time, the resolver rotor 26 (see FIG. 1) may be removed because it is unnecessary.
[0023]
Next, the periphery of the recess 44 on the edge surface 46 is pressed by a pressing jig 52 having five punches 50 corresponding to the arrangement of the recess 44 (see FIG. 5A). The periphery of the recess 44 is caulked by the punch 50 and is plastically deformed. As shown in FIG. 5B, the deformed portion 56 bulging inward by plastic deformation presses and fixes the protruding portion 42 of the resolver 20. At this time, if the applied pressure is adjusted and the deformable portion 56 is expanded within the range of the minute width d, the resolver 20 is not subjected to stress more than necessary.
[0024]
Thereafter, the rotating electrical machine unit 10 is assembled by attaching the rotating shaft 14 to the resolver rotor 26 and attaching the bearings 16 and 18.
[0025]
As described above, in the rotating electrical machine unit 10 according to the first embodiment, the parts for fixing the resolver 20 are unnecessary and inexpensive. Moreover, the resolver 20 can be fixed by one pressurization process by the pressurization jig 52, and the production efficiency is high. In particular, since no bolt is used, the bolt tightening time and the bolt hole processing time are unnecessary, and the assembly man-hour and the processing man-hour can be reduced. Furthermore, it can be easily confirmed that the resolver 20 is fixed by visually observing the deformed portion 56.
[0026]
In addition, when the protrusions 42 are set at unequal pitches with respect to the axial center and the recesses 44 are arranged in the same manner as the protrusions 42, it is easy to determine the angle of the resolver 20 with respect to the housing case 22 and prevent mounting errors. Can do.
[0027]
In FIG. 4, an example in which the tip shape of the punch 50 is a plane is shown, but for example, as shown in FIG. 6A, a punch 50 a having both ends convex may be used. Further, as shown in FIG. 6B, a punch 50b having two convex portions may be used.
[0028]
Next, a rotating electrical machine unit 100 according to a second embodiment will be described with reference to FIGS. In addition, about the rotary electric machine unit 100, the same code | symbol is attached | subjected about the same location as the said rotary electric machine unit 10, and the detailed description is abbreviate | omitted.
[0029]
As shown in FIG. 7, the rotating electrical machine unit 100 includes a resolver 102 that detects the rotation angle of the rotating shaft 14, a metal housing case 104, and an attachment member 105 that attaches the resolver 102 to the housing case 104. The rotating electrical machine unit 100 includes the same rotating electrical machine 12 and bearings 16 and 18 (see FIG. 1) as the rotating electrical machine unit 10 described above.
[0030]
The housing case 104 has a cup shape that is slightly larger than the rotating electrical machine 12, and is mounted with the rotating electrical machine 12, the bearings 16 and 18, the mounting member 105, and the resolver 102. The resolver 102 is provided in the bottom mounting hole 106 inside the housing case 104, and one end of the rotating shaft 14 is connected to the resolver rotor 26 of the resolver 102.
[0031]
As shown in FIG. 8, the stator 108 of the resolver 102 has a cylindrical shape having five recesses (first recesses) 110 extending in the axial direction on the outer periphery, and is configured by laminating a plurality of steel plates. Yes. The resolver 102 is different in the shape of the resolver 20 and the stator 108, and the other parts are the same.
[0032]
The attachment hole 106 to which the resolver 102 is attached has a two-stage cylindrical shape without unevenness. An annular wall 114 is provided around the edge surface 112, which is an inlet portion of the mounting hole 106, and five concave portions (second concave portions) 116 extending in the axial direction are provided on the inner surface of the annular wall 114. ing.
[0033]
The attachment member 105 is a relatively thin spring steel material, and has an annular base portion 118, five outwardly extending portions 120 that extend obliquely outward from the outer peripheral portion of the base portion 118, and the inner periphery of the base portion 118. And five inwardly extending portions 122 heading diagonally inward on the opposite side from the outwardly extending portion 120.
[0034]
The outward extending portion 120 is set in the same arrangement as the arrangement of the recesses 116 and has a width that fits into the recesses 116. The inward extending portion 122 is set to a width that fits into the recess 110. The outward extension 120 is relatively long and the inward extension 122 is relatively short. The outer diameter of the base portion 118 is substantially the same as the outer diameter of the edge surface 112, and the inner diameter of the base portion 118 is slightly smaller than the outer diameter of the resolver 102.
[0035]
Next, a method for assembling the rotating electrical machine unit 100 configured as described above will be described.
[0036]
First, as shown in FIG. 9, the resolver 102 is inserted into the mounting hole 106. At this time, the heights of the end surface 102a and the edge surface 112 of the resolver 102 are substantially the same. The resolver rotor 26 may be removed because it is unnecessary.
[0037]
Next, the outwardly extending portion 120 of the mounting member 105 is press-fitted into the inner surface of the annular wall 114 while being aligned with the recess 116, and inserted until the base portion 118 contacts the edge surface 112. At this time, the attachment member 105 is inserted while adjusting the position so that the inwardly extending portion 122 fits into the concave portion 110 of the resolver 102. The outward extending portion 120 has moderate elasticity, and presses the concave portion 116 of the annular wall 114 with an elastic force, so that the mounting member 105 is fixed to the housing case 104. Further, since the base portion 118 of the mounting member 105 has an inner diameter slightly smaller than the outer diameter of the resolver 102, the base portion 118 abuts against the end surface 102 a and acts as a stopper for the resolver 102. It will be attached to the case 104. Furthermore, since the inwardly extending portion 122 is fitted into the recessed portion 110, the mounting angle of the resolver 102 is set appropriately.
[0038]
Thereafter, the rotating electrical machine unit 10 is assembled by attaching the rotating shaft 14 to the resolver rotor 26 and attaching the bearings 16 and 18.
[0039]
Thus, in the rotating electrical machine unit 100 according to the second embodiment, the resolver 102 can be fixed only by the mounting member 105 and is inexpensive. Further, since no bolt is used, the bolt tightening time and the bolt hole processing time are unnecessary, and the assembly man-hours and the processing man-hours can be reduced. Furthermore, since no force other than the elastic force of the mounting member 105 acts, the stress and distortion generated in the resolver 102 are extremely small, and the rotation angle detection accuracy of the resolver 102 does not decrease.
[0040]
Furthermore, since the housing case 104 does not need to be deformed, the resolver 102 can be replaced by removing the mounting member 105.
[0041]
The inwardly extending portion 122 and the outwardly extending portion 120 are set at unequal pitches with respect to the axial center, the concave portion 110 is arranged in the same manner as the inwardly extending portion 122, and the concave portion 116 is extended outward. When the same arrangement as that of the portion 120 is used, it is easy to determine the angle of the resolver 102 with respect to the housing case 104, and an attachment error can be prevented.
[0042]
The mounting member 105 has been described with respect to the example having the annular base portion 118. However, as shown in FIG. 10A, the protrusions that become the outward extending portion 120 and the inward extending portion 122 from the predetermined planar member are provided. A mounting member 105a (see FIG. 10B) in which the outer extending portion 120 and the inner extending portion 122 are inclined after the shape having the shape is cut out and rounded into a cylindrical shape may be used. Such an attachment member 105a has few unnecessary parts when it is cut out from the original planar member, and has a high yield. In this case, it is preferable that the diameter of the annular portion 124 is set to be slightly smaller than the outer diameter of the resolver 102 and the annular portion 124 acts as a retainer for the resolver 102.
[0043]
Moreover, as shown in FIG. 11, you may use the attachment member 105b which bent the inward extending part 122 and the outward extending part 120 in the same direction. According to the mounting member 105b, after the resolver 102 is temporarily placed in the mounting hole 106 (see FIG. 8), the outer extension 120 is aligned with the recess 116 and the inner extension 122 is aligned with the recess 110. The resolver 102 can be fixed by a single press-fitting process. In this case, it is preferable that the tip of the inward extending portion 122 is bent slightly to act as a stopper for the resolver 102.
[0044]
Furthermore, it is good also as a composite structure of the rotary electric machine unit 10 which concerns on 1st Embodiment, and the rotary electric machine unit 100 which concerns on 2nd Embodiment. That is, using the resolver 20 (see FIG. 3), the mounting angle of the resolver 20 and the housing case 22 is adjusted by fitting the protrusion 42 and the recess 44, while the resolver 20 is fixed by the mounting member 105. In this case, the housing case 22 is provided with a recess 116 similar to the housing case 104 (see FIG. 9), and the inwardly extending portion 122 of the attachment member 105 is not provided.
[0045]
Furthermore, the sensor for detecting the angle of the rotating shaft 14 is not limited to the resolver 20 or 102, and may be, for example, an encoder.
[0046]
Of course, the rotating electrical machine unit according to the present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention.
[0047]
【The invention's effect】
As described above, according to the rotating electrical machine unit according to the present invention, it is possible to reduce the number of parts and the number of assembling steps, and to achieve the effect of producing the rotating electrical machine unit at a low cost with high production efficiency. be able to.
[Brief description of the drawings]
FIG. 1 is a cross-sectional side view showing a rotating electrical machine unit according to a first embodiment.
FIG. 2 is a schematic block diagram showing the operating principle of a resolver.
FIG. 3 is a partially sectional exploded perspective view showing a mounting hole, a resolver, and a rotating shaft of the rotating electrical machine unit according to the first embodiment.
FIG. 4 is a partially enlarged cross-sectional exploded perspective view showing a process of fixing a resolver to a housing case with a pressing jig in the rotating electrical machine unit according to the first embodiment.
FIG. 5A is a partially enlarged schematic side view showing a step of pressing a punch against an edge surface, and FIG. 5B is a partially enlarged schematic side view after a punch is pressed against an edge surface.
FIG. 6A is a schematic side view showing a first modification of the punch, and FIG. 6B is a schematic side view showing a second modification of the punch.
FIG. 7 is a partially enlarged cross-sectional side view of a rotating electrical machine unit according to a second embodiment.
FIG. 8 is a partial cross-sectional exploded perspective view showing a mounting hole, a mounting member, a resolver, and a rotating shaft of a rotating electrical machine unit according to a second embodiment.
FIG. 9 is a partially enlarged cross-sectional exploded perspective view showing a process of fixing a resolver to a housing case with a mounting member in the rotating electrical machine unit according to the second embodiment.
FIG. 10A is a plan view showing a first modification of the attachment member before processing, and FIG. 10B is a perspective view showing a first modification of the attachment member after processing.
FIG. 11 is a perspective view showing a second modification of the attachment member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10,100 ... Rotating electrical machine unit 12 ... Rotating electrical machine 14 ... Rotating shaft 20, 102 ... Resolver 22, 104 ... Housing case 24, 106 ... Mounting hole 26 ... Resolver rotor 32, 108 ... Stator 42 ... Projection part 44, 110, 116 ... Recess 50, 50a, 50b ... Punch 52 ... Pressure jig 56 ... Deformation part 105, 105a, 105b ... Mounting member 114 ... Ring wall 118 ... Base part 120 ... Outward extension part 122 ... Inward extension part

Claims (4)

Rotating electrical machinery,
A sensor for detecting a rotation angle of the rotating electrical machine, provided with a protrusion extending in the axial direction on the outer periphery;
A housing case provided with the sensor;
Have
The housing case has a mounting hole into which the sensor is inserted,
The mounting hole extends in the axial direction and has a recess into which the protrusion is inserted.
The recess is slightly longer than the height of the sensor,
Rotating, characterized in that said end surface around the recess at the inlet side of the mounting hole by plastic working crushing by punch to form a deformed portion that bulges inwardly of the recess to fix the sensor by the modified form unit Electric unit. In the rotating electrical machine unit according to claim 1,
The rotating electrical machine unit, wherein the protrusion and the recess have a semicircular cross section. Rotating electrical machinery,
A sensor for detecting a rotation angle of the rotating electrical machine, the outer periphery having a first recess extending in the axial direction;
A housing case to which the sensor is attached by an attachment member formed by processing from a thin flat member;
Have
The housing case has a mounting hole into which the sensor is inserted;
An annular wall provided around the inlet side of the mounting hole and having a second recess extending in the axial direction on the inner periphery;
Have
The mounting member includes an annular portion,
An inwardly extending portion that is obliquely inward with a width that fits into the first recess,
An outwardly extending portion that obliquely outwards in the direction of the opening side of the housing case with a width that fits into the second recess, with reference to the periphery of the inlet side of the mounting hole;
Have
The rotating electrical machine characterized in that the sensor is fixed by fitting the inward extending portion into the first recess of the sensor and press-fitting the outward extending portion into the second recess. unit. The rotating electrical machine unit according to claim 3,
The rotating electrical machine unit characterized in that the inwardly extending portion extends in a direction of insertion into the mounting hole with reference to a periphery of the inlet side of the mounting hole.

Images