JP2016220332A - Rotating electric machine - Google Patents

Abstract

A rotating electrical machine with high reliability that suppresses vibration of a joint member is provided. An electric rotating machine includes an output shaft 7 rotatably provided on a central axis in a yoke 2, a rotor 8 fixed to the output shaft 7, and an output end 7b on the other side of the output shaft 7. And a joint member 200 to be press-fitted. The joint member 200 is formed on one side and has a press-fit portion 32 having a press-fit hole 31 into which the output end portion 7b of the output shaft 7 is press-fitted, and a driven member to which the rotational torque of the output shaft 7 is transmitted. And a groove portion 38 formed in the press-fit hole 31 of the press-fit portion 32 of the joint member 200 or a groove portion formed in the output end portion 7 b of the output shaft 7. Yes. [Selection] Figure 1

Description

  The present invention relates to a rotating electrical machine used in, for example, an electric power steering device that assists the steering force of a vehicle steering, and relates to a joint member that is fitted to an output shaft of the rotating electrical machine.

  As a joint member in a conventional rotating electrical machine, for example, there is one disclosed in JP-A-2002-369443. In Japanese Patent Application Laid-Open No. 2002-369443, a spline portion is formed on the output shaft, and quenching is performed. The joint member fitted to the output shaft has the same hardness as the output shaft, and an output shaft mounting hole is formed in the joint member. The spline portion of the hardened output shaft is press-fitted and fixed while being bitten into the output shaft mounting hole of the joint member.

JP 2002-369443 A

  The conventional rotating electric machine described above has a problem in that the joint member is greatly shaken because the spline portion of the output shaft is press-fitted while being engaged with the output shaft mounting hole of the joint member.

  In addition, there is a problem that man-hours increase because it is necessary to separately perform processing and quenching for forming the spline portion of the output shaft.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a highly reliable rotating electrical machine.

  In the rotating electrical machine according to the present invention, an output shaft rotatably provided on a central axis in the yoke, a rotor fixed to the output shaft, and an output end on the other side of the output shaft are press-fitted. A rotary electric machine including a joint member, wherein the joint member is formed on one side, a press-fit portion having a press-fit hole into which the output end portion of the output shaft is press-fitted, and the other side, A groove portion formed in the press-fitting hole of the press-fitting portion of the joint member or the output end portion of the output shaft, the engaging portion being engaged with a driven shaft to which the rotational torque of the output shaft is transmitted. It is provided.

  According to the rotating electrical machine according to the present invention, by providing the press-fitting hole of the press-fitting portion of the joint member or the groove formed at the output end of the output shaft, the output end of the output shaft is press-fitted to the press-fitting portion of the joint member. A rotating electrical machine that can be press-fitted into the hole with increased reliability can be obtained.

It is sectional drawing which shows the rotary electric machine concerning Embodiment 1 of this invention. It is sectional drawing which shows the joint member in the rotary electric machine concerning Embodiment 1 of this invention. It is explanatory drawing which shows the processing method of the joint member in the rotary electric machine concerning Embodiment 1 of this invention. It is an enlarged view which shows the front-end | tip part of the output shaft in the rotary electric machine concerning Embodiment 2 of this invention. It is sectional drawing which shows the joint member in the rotary electric machine concerning Embodiment 3 of this invention. It is sectional drawing which shows the joint member in the rotary electric machine concerning Embodiment 4 of this invention.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 3. In the drawings, the same or equivalent members and parts will be described with the same reference numerals. 1 is a cross-sectional view showing a rotary electric machine according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view showing a joint member in the rotary electric machine according to Embodiment 1 of the present invention. FIG. 3 is an explanatory view showing a method of processing a joint member in the rotary electric machine according to Embodiment 1 of the present invention.

  FIG. 1 is a cross-sectional view showing a case of a motor 100 for an electric power steering device as a rotating electrical machine according to Embodiment 1 of the present invention. A motor 100 that is a rotating electric machine includes a yoke 2 that is a bottomed cylindrical case, a four-pole field permanent magnet 3 that is fixed to the inner wall surface of the yoke 2 at equal intervals in the circumferential direction, and a yoke 2. An output shaft 7 which is a rotating shaft whose one end 7a is rotatably supported by a rear bearing 6 housed in the bottomed bearing housing portion 5 and an amateur 8 which is a rotor fixed to the output shaft 7. And a commutator 9 fixed to the output shaft 7; a brush 11 that is in contact with the surface of the commutator 9 by the elastic force of the spring 10; a brush holder 12 that holds the brush 11; Housing 14, the front bearing 15 fixed to the center of the housing 14 and rotatably supporting the output end 7b which is the other side of the output shaft 7, and the output end 7b of the output shaft 7 are press-fitted. Fixed A joint member 200, a lead wire 17 connected to the brush 11 and a grommet 18 penetrates.

  The amateur 8 includes a core 19 having a plurality of slots extending in the axial direction and spaced apart in the circumferential direction, and a winding 20 formed by winding a conductive wire around the slots in a double winding manner. The winding 20 is connected to the commutator 9.

  In the motor 100 having the above-described configuration, when a current is supplied from the lead wire 17 to the winding 20 connected to the commutator 9 via the brush 11, the armature 8 causes the output shaft to be output by electromagnetic action with the field permanent magnet 3. 7 and rotate. The output end 7b of the output shaft 7 is press-fitted into the press-fitting hole 31 of the joint member 200, and the driven shaft (not shown) is engaged with the driven shaft to which the rotational torque of the output shaft 7 is transmitted. Since it is spline-coupled to the spline portion 33 formed in the engagement portion 34 of the joint member 200, the rotational torque of the output shaft 7 is reliably transmitted to the driven shaft, and is used to assist the steering force of the steering (not shown). Is done.

  FIG. 2 is a cross-sectional view of the joint member 200 of FIG. One side 200a of the joint member 200 has a press-fit portion 32 having a press-fit hole 31 into which the output shaft 7 is press-fitted. The inner periphery of the press-fit hole 31 of the press-fit portion 32 is a groove 38 on the inner circumference. The output end 7 b of the output shaft 7 is press-fitted into the press-fitting hole 31 of the press-fitting part 32.

  Further, the other side 200b of the joint member 200 has an engaging portion 34 that is spline-engaged with a driven shaft (not shown) to which the rotational torque of the output shaft 7 is transmitted. A spline portion 33 having an inner diameter larger than that of the press-fitting hole 31 is formed on the inner periphery, and is splined to the driven shaft via the spline portion 33.

  FIG. 3 is an explanatory diagram showing a method of processing the joint member 200 according to Embodiment 1 of the present invention. The joint member 200 is formed as a single part by cold forging a metal base material 42 made of iron or the like. That is, as shown in FIG. 3, a forming pin (pin member) 41 is installed in a die 40, and a base material 42 arranged in the die 40 is pressed by a punch 43 from above the forming pin 41. Is done.

  In this case, a tip 41a for forming a prepared hole of the press-fitting hole 31 is provided above the molding pin 41, and an involute spline is formed on the outer periphery of the molding pin 41. A spline portion 44 is provided. The outer diameter of the tip 41a of the forming pin 41 is smaller than the outer diameter of the portion where the spline portion 44 is provided.

  Then, by pressing the base material 42 while contacting the forming pin 41 from above, the base material 42 is plastically deformed in the axial direction, thereby forming the engaging portion 34 having the spline portion 33 inside. A prepared hole having a smaller diameter than the press-fitting hole 31 is formed on the inner surface of the press-fitting part 32 on the surface opposite to the engaging part 34 by the tip part 41a.

  Furthermore, the base material 42 is plastically deformed, so that an extended portion (rib) 35 extending outward in the radial direction is formed on the outer periphery of the press-fit portion 32.

  Next, by cutting the prepared hole using the spline portion 33 as a reference, a circular press-fit hole 31 having a groove portion 38 on the inner circumference is formed. Thereby, the press-fitting hole 31 of the press-fitting part 32 and the engaging part 34 having the spline part 33 are formed as the joint member 200 with good accuracy.

  At this time, the corner portion 37 of the extending portion 35 is formed in an R shape (see FIG. 2). 2 shows the case where the die 40 is configured such that the corner portion 37 of the extending portion 35 is formed in an R shape, the present invention is not limited to this case, and a predetermined inclination angle (for example, , 30 degrees), the die 40 may be configured to have a tapered shape.

  Further, on the outer periphery of the press-fit portion 32 of the joint member 200, an extension portion 35 extending radially outward is integrally formed with the joint member 200 by cold forging, and as a result, the press-fit portion 32 Since the wall thickness is increased, when the output shaft 7 is press-fitted into the press-fitting hole 31 of the press-fitting part 32, resistance to tensile stress applied to the press-fitting part 32 is improved. Therefore, the occurrence of cracks during press-fitting can be suppressed, and a sufficient fixing force between the output shaft 7 and the joint member 200 can be ensured.

  In addition, the cold forging process forms the engaging portion 34 and the extending portion 35, and a plurality of grooves 36 are formed at equal intervals in the circumferential direction over the outer periphery of the engaging portion 34. 32 and a single unit.

In the first embodiment of the present invention, the case where the groove 36 is formed over the outer periphery of the engaging portion 34 has been described. However, the present invention is not limited to this, and the outer periphery of the joint member 200 includes the driven shaft side end portion. If the groove 36 is formed from the side toward the output shaft 7 side, the length of the groove 36 is longer than the axial length of the engaging portion 34 and shorter than the axial length of the joint member 200. For example, the groove 36 may be formed on the outer periphery of the joint member 200 from the driven shaft side end portion of the engaging portion 34 to a part of the press-fit portion 32. Since the groove 36 is formed from the driven shaft side end toward the output shaft 7 side, and the length of the groove 36 is longer than the axial length of the engaging portion 34, at least the outer periphery of the engaging portion 34. Groove 36 throughout
Is formed.

  Since the first embodiment of the present invention is configured as described above, the cylindrical yoke 2, the output shaft 7 rotatably provided on the central axis in the yoke 2, and the output shaft 7 A fixed armature 8, a press-fit portion 32 having a press-fit hole 31 into which the output end 7 b of the output shaft 7 is press-fit on one side, and a driven shaft to which the rotational torque of the output shaft 7 is transmitted on the other side; It has an engaging portion 34 having a spline portion 33 to be spline engaged, and a joint member 200 formed by cold forging a metal base material 42, and is formed on the inner periphery of the press-fit portion 32. Since the press-fitting hole 31 has a groove 38 and the output end 7b of the output shaft 7 is press-fitted into the press-fitting hole 31 formed in the inner periphery of the press-fitting part 32, press-fitting caused by galling or the like during press-fitting. When the waste escapes into the groove 38, Without entering is prevented, it is possible to suppress the press fitting failure.

  Further, since the shaving residue generated by galling or the like escapes into the groove portion 38, the joint member 200 at the time of press-fitting is pressed into the output end portion 7b of the output shaft 7 without bending. The vibration of the joint member 200 can be suppressed.

In addition, since a plurality of groove portions 38 are provided, shavings generated by galling or the like can escape to the plurality of groove portions 38, and the stability against press-fitting is further improved.
Thus, a highly reliable rotating electrical machine can be obtained.

Embodiment 2. FIG.
The second embodiment of the present invention will be described with reference to FIG. 4. In the drawings, the same or corresponding members and parts will be described with the same reference numerals. FIG. 4 is an enlarged view showing the tip end portion of the output shaft in the rotary electric machine according to Embodiment 1 of the present invention.

  In the first embodiment described above, the case where the groove portion 38 is provided on the inner circumference of the press-fit hole 31 of the press-fit portion 32 has been described. Instead, as shown in FIG. Alternatively, a similar groove 7c may be provided on the outer diameter circumference of the output end 7b of the output shaft 7.

  FIG. 4 is an enlarged view of the output end 7 b of the output shaft 7. The output end 7b of the output shaft 7 is a round portion 7d (circular shape) having a plurality of grooves 7c on the outer diameter circumference, and is press-fitted into the press-fitting hole 31 of the press-fit portion 32. In addition, although it showed about the case where it had the same groove part 7c on the outer diameter circumference of the output end part 7b of the output shaft 7, as shown in FIG. 2, the groove part 38 on the inner diameter circumference is inserted into the press-fit hole 31 of the press-fit part 32. You may have.

  In addition, since structures other than the groove part which concerns on Embodiment 2 of this invention are the same as Embodiment 1, the detailed description is abbreviate | omitted.

  Since the second embodiment of the present invention is configured as described above, the cylindrical yoke 2, the output shaft 7 rotatably provided on the central axis in the yoke 2, and the output shaft 7 A fixed armature 8 and a press-fit portion 32 having a press-fitting portion 32 having a press-fitting hole 31 into which the output shaft 7 is press-fitted on one side 200a, and a driven shaft to which the rotational torque of the output shaft 7 is transmitted on the other side 200b. And a joint member 200 formed by cold forging a metal base material 42, and a groove portion 7 c on the output end portion 7 b of the output shaft 7. Since the output end 7b of the output shaft 7 is press-fitted into the press-fitting hole 31 formed in the inner periphery of the press-fitting portion 32, a press-fitting scrap generated by galling or the like during press-fitting is generated at the output end of the output shaft 7. Escape to the groove 7c of the portion 7b Therefore, without the press-fitting is prevented, it is possible to suppress the press fitting failure.

Further, the shavings generated by galling or the like escape into the groove portion 7c of the output end portion 7b of the output shaft 7, so that the joint member 200 at the time of completion of press-fitting is press-fitted without bending to the output end portion 7b of the output shaft 7. Therefore, the shake of the joint member 200 with respect to the axis reference of the output shaft 7 can be suppressed. In addition, by providing a plurality of groove portions 7c of the output end portion 7b of the output shaft 7, the stability against press fitting is further improved.
Thus, a highly reliable rotating electrical machine can be obtained.

Embodiment 3 FIG.
A third embodiment of the present invention will be described with reference to FIG. 5. In the figure, the same or equivalent members and parts will be described with the same reference numerals. 5 is a cross-sectional view showing a joint member in a rotary electric machine according to Embodiment 3 of the present invention.

  FIG. 5 is a cross-sectional view of joint member 300 according to Embodiment 3 of the present invention. One side 300a of the joint member 300 has a press-fit portion 32a having a press-fit hole 31 into which the output end 7b of the output shaft 7 is press-fitted, and the inner periphery of the press-fit hole 31 of the press-fit portion 32a has an inner diameter circle. A round-shaped portion 39 (circular shape) having a spiral groove portion 38a on the circumference, and the output end 7b of the output shaft 7 is press-fitted into the press-fitting hole 31 of the press-fitting portion 32a.

  In addition, although it showed about the case where it has the spiral-shaped groove part 38a on the internal diameter circumference of the press-fit hole 31 of the press-fit part 32a, instead of the press-fit hole 31 of the press-fit part 32a instead of the second embodiment described above, A similar spiral groove may be formed on the outer diameter circumference of the output end 7b of the output shaft 7.

  Further, in the joint member 300 according to Embodiment 3 of the present invention, the configuration other than the press-fit portion 32a of the joint member 300 shown in FIG. 5 is the same as that of the joint member 200 shown in FIG. To do.

  Since the third embodiment of the present invention is configured in this manner, the cylindrical yoke 2, the output shaft 7 that is rotatably provided on the central axis in the yoke 2, and the output shaft 7 A driven arm 8 having a fixed armature 8 and a press-fitting portion 32a having a press-fitting hole 31 into which the output end 7b of the output shaft 7 is press-fitted on one side 300a, and the rotational torque of the output shaft 7 being transmitted to the other side 300b. And a joint member 300 formed by cold forging a metal base material 42 and having an engagement portion 34 having a spline portion 33 that is spline-engaged with the shaft, and is provided on the inner periphery of the press-fit portion 32a. The formed press-fitting hole 31 has a spiral groove 38a, and the output end 7b of the output shaft 7 is press-fitted into the press-fitting hole 31 formed on the inner periphery of the press-fitting part 32a. Press-fitting machining caused by etc. There By escaping the groove 38a of the spiral-shaped, press-fit unimpeded, it is possible to suppress the press fitting failure.

Further, since the shavings generated by galling or the like escape into the spiral groove 38a, the joint member 300 at the time of press-fitting is pressed into the output end 7b of the output shaft 7 without bending, so that the output shaft 7 The deflection of the joint member 300 with respect to the axis reference can be suppressed. Further, by providing the spiral groove 38a, it is possible to prevent a reduction in the fixing force between the output shaft 7 and the joint member 300 in the rotational direction.
Thus, a highly reliable rotating electrical machine can be obtained.

Embodiment 4 FIG.
Embodiment 4 of the present invention will be described with reference to FIG. 6. In the figure, the same or equivalent members and parts will be described with the same reference numerals. 6 is a cross-sectional view showing a joint member in a rotary electric machine according to Embodiment 4 of the present invention.

  FIG. 6 is a cross-sectional view of joint member 400 according to Embodiment 4 of the present invention. One side 400a of the joint member 400 has a press-fit portion 32b having a press-fit hole 31 into which the output end 7b of the output shaft 7 is press-fitted, and the inner periphery of the press-fit hole 31 of the press-fit portion 32b has an inner diameter circle. For example, a round-shaped portion 39b (circular shape) having a spiral groove 38b on the periphery and not partially formed with an uneven portion is provided on the press-fit inlet side, for example, and the output end 7b of the output shaft 7 is press-fitted It press-fits into the press-fit hole 31 of the part 32b.

  In addition, although it showed about the case where it has the spiral-shaped groove part 38b on the internal diameter circumference of the press-fit hole 31 of the press-fit part 32b, the same spiral-shaped groove part is provided on the outer diameter circumference of the output end part 7b of the output shaft 7. You may have.

  Further, in the joint member 400 according to the fourth embodiment of the present invention, the configuration other than the press-fitting portion 32b of the joint member 400 shown in FIG. 6 is the same as that of the joint member 200 shown in FIG. To do.

  Since the fourth embodiment of the present invention is configured as described above, the cylindrical yoke 2, the output shaft 7 rotatably provided on the central axis in the yoke 2, and the output shaft 7 A driven arm 8 having a fixed armature 8 and a press-fitting portion 32b having a press-fitting hole 31 into which the output end 7b of the output shaft 7 is press-fitted on one side 400a, and the rotational torque of the output shaft 7 being transmitted to the other side 400b. And a joint member 400 formed by cold forging a metal base material 42 and having an engagement portion 34 having a spline portion 33 that is spline-engaged with the shaft, on the inner periphery of the press-fit portion 32a. The formed press-fitting hole 31 has a spiral groove 38b, and the output end 7b of the output shaft 7 is press-fitted into the press-fitting hole 31 formed on the inner periphery of the press-fitting part 32a. Press-fit scraps caused by etc. By escaping the groove 38b of the spiral-shaped, without press-fitting is prevented, it is possible to suppress the press fitting failure.

Further, since the shaving residue generated by galling or the like escapes to the spiral groove 38b, the joint member 400 at the time of press-fitting is pressed into the output end 7b of the output shaft 7 without bending, so that the output shaft 7 The deflection of the joint member 400 with respect to the axis reference can be suppressed. Further, by providing the spiral groove 38b, it is possible to prevent a reduction in the fixing force between the output shaft 7 and the joint member 400 in the rotational direction.
Thus, a highly reliable rotating electrical machine can be obtained.

  Further, since the press-fit portion 32b of the joint member 400 has the round-shaped portion 40 in which a part of the uneven portion is not formed, the entry of foreign matter can be prevented by the round-shaped portion 39b. In addition, since the round-shaped portion 39b (circular shape) is provided on the press-fit inlet side of the press-fit portion 32b, stability against press-fit is further improved.

  It should be noted that within the scope of the present invention, the embodiments can be freely combined, or the embodiments can be appropriately modified or omitted.

  The present invention is suitable for realizing a highly reliable rotating electrical machine.

2 yoke, 3 field permanent magnet, 5 bearing housing, 6 rear bearing, 7 output shaft, 7b output end, 7c groove, 7d round shape, 8 amateur (rotor), 9 commutator, 10 spring, 11 Brush, 12 Brush holder, 13 Screw, 14 Housing, 15 Front bearing, 17 Lead wire, 18 Grommet, 19 Core, 20 Winding, 31 Press-in hole, 32 Press-in part, 32a Press-in part, 32b Press-in part, 33 Spline part, 34 engaging portion, 38 groove portion, 38a spiral groove portion, 38b spiral groove portion, 39 round shape portion, 39a round shape portion, 39b round shape portion, 40 dies, 41 molding pin (pin member), 41a tip portion, 42 Base material, 43 punch, 44 spline part, 100 motor (rotary electric machine), 200 joint member, 200a one side, 200b etc. Side, 300 joint member, 300a on one side, 300b the other side, 400 joint member, 400a on one side, 400b other side

In the rotating electrical machine according to the present invention, an output shaft rotatably provided on a central axis in the yoke, a rotor fixed to the output shaft, and an output end on the other side of the output shaft are press-fitted. A rotary electric machine including a joint member, wherein the joint member is formed on one side, a press-fit portion having a press-fit hole into which the output end portion of the output shaft is press-fitted, and the other side, The circumferential direction formed in the press-fitting hole of the press-fitting part of the joint member or the output end part of the output shaft, the engaging part being engaged with a driven shaft to which the rotational torque of the output shaft is transmitted it is provided with a groove portion.

Claims (5)

  A rotating electrical machine comprising: an output shaft rotatably provided on a central axis in a yoke; a rotor fixed to the output shaft; and a joint member into which an output end on the other side of the output shaft is press-fitted The joint member is formed on one side, a press-fit portion having a press-fit hole into which the output end portion of the output shaft is press-fitted, and the other side, and the rotational torque of the output shaft is transmitted to the joint member. And a groove portion formed in the press-fitting hole of the press-fitting portion of the joint member or the output end portion of the output shaft. Electric.   The rotating electrical machine according to claim 1, wherein a plurality of the groove portions are provided.   The rotating electrical machine according to claim 1, wherein the groove has a spiral shape.   The rotation according to any one of claims 1 to 3, wherein the press-fitting hole of the press-fitting part of the joint member or the output end of the output shaft has a round-shaped part. Electric. The rotating electrical machine according to claim 4, wherein the round shape portion is provided at a press-fit inlet of the press-fit hole of the press-fit portion of the joint member.

Images