JP6506523B2 - Automotive electric rotating machine - Google Patents

Description

  The present invention relates to a structure for fixing a cover motor (bearing bearing flange) used for a vehicle-mounted rotating electrical machine to a housing, and a bearing structure of the rotating electrical machine.

  As prior art, there are the following two documents. Patent Document 1 discloses a structure in which the fixing of a bearing case and a motor housing equivalent to a cover motor is positioned with a motor housing at an inlay portion of the bearing case and screwed. Further, Patent Document 2 discloses a structure in which a screw is fixed in the same manner as Patent Document 1, but in this bearing case, the motor three-phase output connection consisting of a stator winding extends to the inside of the motor housing Passing through.

International Publication WO2008 / 108431 JP, 2013-34388, A

  In the case of Patent Document 1, the bearing case and the motor housing are fixed by screws. For this reason, a screw seat surface becomes a required shape in a bearing case and a motor housing, and it is possible that a component enlarges.

  Further, as described in Patent Document 2, as in Patent Document 1, it is conceivable that the bearing case and the motor housing need to be enlarged because a screw seat surface is required.

  Then, an object of this invention is to provide the vehicle-mounted rotary electric machine which can fix a motor housing and components equivalent to a cover motor, without enlarging.

  In order to solve the above problems, for example, the configuration described in the claims is adopted.

Although the present application includes a plurality of means for solving the above-mentioned problems, one example is that one bearing is disposed in an integrally formed housing,
The other bearing is placed on the cover motor,
The housing by an axial force generated by the cover motor being axially pinched by a ring-shaped member shrink-fitted or press-fit into the housing, and a cover motor mounting surface formed on the inner peripheral side of the housing. is fixed to,
A three-phase output terminal for outputting three-phase AC power extends axially from the cover motor, and an end of the three-phase output terminal is in the housing and an axial end of the housing It is characterized in that it is arranged axially inside .

  According to the present invention, there is no need to provide a fixing portion for the motor housing and the cover motor, and downsizing and parts cost reduction can be achieved.

  Problems, configurations, and effects other than those described above will be clarified by the description of the following embodiments.

Cross-sectional view for explaining the configuration of a motor for electric power steering Sectional perspective view of the housing and stator assembled state of the first embodiment and the second embodiment Cross-sectional perspective view of the cover motor and the rotor assembled state of the first embodiment and the second embodiment The housing of Example 1 and Example 2, and the cross-sectional perspective view of cover motor fitting state (A) A perspective view of the cover motor fixing member of the first embodiment, (b) a perspective view of the cover motor fixing member of the second embodiment Cross-sectional perspective view of the cover motor fixing member general state of Embodiment 1 and Embodiment 2

  An embodiment of the present invention will be described with reference to FIGS.

  A structure for fixing a cover motor (bearing bearing flange) to a housing using an electric power steering motor, which is an embodiment of the present invention, and a bearing structure of a rotating electrical machine will be described. FIG. 1 shows an axial sectional view of the electric power steering motor.

  First, the entire configuration will be described. On the inner peripheral side of the housing 1, the stator core 2 divided is press-fit or shrink-fit while holding the ring shape without welding or welding. A bobbin 3 is attached to the stator core 2 and a coil 4 is wound around the outer periphery thereof. The lead wire of coil 4 is connected to relay terminal 15 provided on relay terminal block 14 by mechanical caulking and welding, and the end face of relay terminal 15 having through hole 15 a through which screw 18 passes is provided on bus bar mold 16 Further, the relay terminal 15 and the three-phase output terminal 17 are connected by fastening the screw 18 to the end face of the three-phase output terminal 17 having the seat portion of the screw 18. On the inner peripheral side of the stator core 2, a rotor composed of a shaft 5, a rotor core 6, a magnet 7 and a magnet cover 8 is provided. The rotor is supported by an F bearing 9 and an R bearing 10. Is axially fixed to the housing 1 using a tome wheel 12 and the R bearing 10 is subjected to a preload force of a preload spring 11 to cancel the internal and external clearances of the F bearing 9 and the R bearing 10 while the cover motor is It is fixed to the shaft 5 so as not to be affected by preload in the direction in which the gear 13 is disengaged. The cover motor 13 is fixed by shrink-fitting or press-fitting the ring 19a inside the housing 1 and sandwiching the ring 19a with the ring 19a as if pressed against the cover motor mounting surface 1a of the housing 1 . The cover motor 13 is provided with a through hole, through which the relay terminal 15 and the three-phase output terminal 17 pass, and in the space of the insulator of the bus bar mold 16, as described above, Three-phase output terminal 17 is connected. Further, the relay terminal 15 and the three-phase output terminal 17 are wired so that the connection of each phase can be output in three phases, which is a three-phase output of UVW. By supplying power from the inverter to the three-phase output terminal 17, the motor rotates.

  Next, the internal configuration of the housing 1 before the cover motor 13 is inserted will be described using FIG. A stator core 2 is disposed at the outermost periphery inside the housing 1. The stator core 2 is constituted by a T-shaped split core, and in a state in which the bobbins 3 are combined with two teeth, a two continuous winding structure in which one coil 4 is intensively wound is formed. Each stator core 2 is connected in a ring shape by welding or welding without at the outer periphery of the core back. The lead wire of the coil 4 is connected to the relay terminal 15 by mechanical caulking and welding through the through hole of the relay terminal block 14 formed of resin. The relay terminal 15 for three-phase output of U, V, and W is provided with a three-phase output terminal 17 and a through hole 15 a for enabling connection with the screw 18. The relay terminal block 14 is fixed to the bobbin 3 made of resin by heat caulking or an adhesive. A combination of a winding unit composed of the stator core 2 and the like and a connection unit composed of the relay terminal block 14 and the like is inserted and fitted into the inside of the housing 1 by shrink fitting or press fitting. A cover motor mounting surface 1 a is formed inside the housing 1 by using a step portion with a different diameter. The F bearing 9 is inserted into the bearing box of the housing 1, and the F bearing 9 is fixed by the tome wheel 12.

  The configuration of the rotor before insertion of the housing 1 will be described with reference to FIG. The rotor core 6 is fixed on the outer peripheral side of the shaft 5 by shrink fitting or press fitting, and an adhesive is applied to the outer peripheral surface of the rotor core 6 to fix the magnet 7. A magnet cover 8 is disposed on the outer surface of the magnet 7. The R bearing 10 is disposed in such a manner that the preload spring 11 is installed in the bearing box of the cover motor 13 and the preload spring 11 is sandwiched with the bearing box of the cover motor 13, and the shaft 5 and the inner ring of the R bearing are press-fitted and fixed. .

  The state in which the cover motor 13 is mounted on the cover motor mounting surface 1 a of the housing 1 will be described using FIG. 4. As described above with reference to FIG. 2, the cover motor mounting surface 1 a is formed in the housing 1 by forming stepped portions with different diameters. The cover motor 13 is mounted on the upper surface of the cover motor mounting surface 1 a, and the three-phase relay terminal 15 of UVW provided on the relay terminal block 14 is provided on the cover motor 13 via the through hole. Placed on top.

  FIG. 5A shows a first ring-shaped embodiment for fixing the cover motor 13 inside the housing 1. Since the cover motor 13 is not fixed in the axial direction when the housing 1 and the cover motor 13 are mounted as described above with reference to FIG. 4 and the cover motor 13 is rotated, the ring 19a is used as a housing. (1) Axial fixation and rotation suppression of the cover motor 13 by utilizing the axial force generated by shrink-fitting or press-fitting inside and axially sandwiching the cover motor 13 between the cover motor mounting surface 1a and the end face of the ring 19a. And prevent rotation. The ring 19 a is disposed, for example, near an axial substantially central position of the housing 1.

  When the ring 19a is made of the same material as the housing 1 and the cover motor 13, loose fitting due to a difference in thermal expansion coefficient can be prevented. In addition, since it is possible to fit inside the housing 1 and it becomes unnecessary to increase the extra thickness of the housing 1 for fitting the ring 19a, it is possible to prevent the parts from becoming large. . Furthermore, when using it as a waterproof type rotary electric machine, it is not necessary to take a waterproof seal structure on the fitting surface of the housing 1 and the cover motor 13, and it becomes possible to make a waterproof type rotary electric machine. In the motor three-phase output connection, the connection processing can be performed only in the housing 1 and it is possible to obtain a structure without contamination from the outside of the housing 1.

  FIG. 5B shows a second embodiment of a ring shape for fixing the cover motor 13 inside the housing 1. As described above, by using the same material as the housing 1 and the cover motor 13 as the material of the ring 19b, it is possible to obtain the same effect as the effect described in (a) of FIG. In the second embodiment shape shown in (b) of 5), a tooth shape is added to the surface to be held when the cover motor 13 of the ring 19b is fixed. The convex tooth shape (convex portion) newly added by the ring 19 b is provided with a concave portion (not shown) on the fitting surface of the cover motor 13 with the ring 19 b, whereby the convex and concave shape is fitted to further strengthen It is possible to suppress the rotation of the cover motor 13.

  FIG. 6 shows a state in which the ring 19a and the ring 19b are shrink fitted or pressed into the housing 1. As described above with reference to FIGS. 5A and 5B, the ring 19a is shrink-fitted or press-fitted into the housing 1, and the cover motor 13 is axially mounted on the cover motor mounting surface 1a and the end face of the ring 19a. The axial fixing of the cover motor 13 and the rotation suppression and the rotation prevention are performed by utilizing the axial force generated by the sandwiching.

  Further, in the second embodiment, a convex tooth shape is added to the surface to be held when fixing the cover motor 13 of the ring 19b, and a concave shape (not shown) to the fitting surface of the cover motor 13 As a result, the convex-concave shape is fitted, and the rotation of the cover motor 13 can be suppressed more firmly.

  By using the same material as the housing 1 and the cover motor 13 as the material of the rings 19a and 19b, it is possible to prevent loose fitting due to a difference in thermal expansion coefficient.

  In addition, since it is possible to fit inside the housing 1 and it becomes unnecessary to increase the extra thickness of the housing 1 for fitting the ring 19a, it is possible to prevent the parts from becoming large. . For example, the rings 19a and 19b can be fitted in a portion where the thickness of the housing 1 is 4 mm or less.

  Furthermore, when using as a waterproof type rotary electric machine, it is not necessary to take a waterproof seal structure on the forged surface of the housing 1 and the cover motor 13, and it becomes possible to make a waterproof type rotary electric machine.

  In the motor three-phase output connection, the connection processing can be performed only in the housing 1 and it is possible to obtain a structure without contamination from the outside of the housing 1.

  A brief summary of an example embodiment of the present invention is as follows.

<Aspect 1 of the Embodiment>
A rotating electric machine used for vehicles, which has a single bearing in an integrally formed housing and supports a single bearing, and a cover motor (a bearing bearing flange) is baked by the ring-like member in the housing. Fix in place.

Embodiment 2 of the Embodiment
In the ring-shaped member according to the first embodiment, the cover motor fixing surface is provided with a convex tooth shape, and the O motor of the cover motor is fitted in a concave shape.

<Aspect 3 of the embodiment>
The ring-shaped member according to Embodiment 1 or 2 has substantially the same linear expansion coefficient as the housing and the cover motor.

<Aspect 4 of the Embodiment>
The ring-shaped member according to the embodiment 1 or 2 is fitted in the vicinity of a substantially central position in the axial direction of the housing.

<Fifth embodiment of the present invention>
The ring-shaped member of embodiment 1 or 2 is fitted to a portion having a housing thickness of 4 mm or less.

  In the prior art, for example, the one described in Patent Document 1, a bearing case and a motor housing are fixed by screws. For this reason, a screw seat surface becomes a required shape in a bearing case and a motor housing, and it is possible that a component enlarges. In addition, the mating face of the bearing case and the motor housing is not a waterproof seal structure using a rubber member or the like, and it is necessary to further increase the size of the waterproof seal structure and to add a dedicated waterproof seal part. Things can be considered. Since it does not have a waterproof seal structure, there is the possibility of contamination entering the motor from the outside of the motor, and there is a possibility that the contamination may occur on the inner roller of the motor and the air gap surface of the stator and the motor lock. Is considered.

  Further, as described in Patent Document 2, as in Patent Document 1, it is conceivable that the bearing case and the motor housing need to be enlarged because a screw seat surface is required. In addition, it is conceivable that the fitting surface of the bearing case and the motor housing is not a waterproof seal structure, and the structure is poor in waterproofness. Furthermore, since the motor three-phase output connection consisting of a stator winding is passed from the inside of the motor housing to the outside in the bearing case, it is conceivable that an air hole is formed at the location where the connection passes. Contamination resistance is considered to be worse than the structure described in Patent Document 1.

  Therefore, by adopting the present invention, the cover motor can be fixed on the inner diameter side of the motor housing, and the parts can be prevented from increasing in size. Further, the fitting surface of the motor housing and the cover motor can be made inside the motor housing, and in the case of a waterproof type rotating electric machine, there is no need to provide a waterproof seal structure on the fitting surface. Furthermore, by having a structure capable of 3-phase motor output connection within the motor housing, it is possible to obtain a structure in which there is no contamination from the outside of the motor housing. In addition, as a conventional ring structure, the cover motor was fixed in the axial direction by the frictional force due to biting into the inner diameter of the motor housing using the spring force of the C-shaped ring as the fixing of the cover motor. When a C-shaped ring is adopted, it is necessary to form a mounting groove in the motor housing, so that the motor housing is enlarged in the radial direction, and the workability at the time of inserting the C ring is poor. Since the O-ring is adopted, it becomes possible to improve the workability and safety at the time of fitting, and to prevent an increase in the thickness of the motor housing.

  The present invention can be used as a structure for fixing a bearing motor and a cover motor of a motor-vehicle-mounted rotating electric machine such as a brushless motor or various generators used for an electric power steering motor to a housing.

  The present invention is not limited to the embodiments described above, but includes various modifications. For example, the embodiments described above are described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. In addition, with respect to a part of the configuration of each embodiment, it is possible to add, delete, and replace other configurations.

100 motor for motor 1 housing 1a cover motor mounting surface 2 stator core 3 bobbin 4 coil 5 shaft 6 rotor core 7 magnet 8 magnet cover 9 F bearing 10 R bearing 11 preload spring 12 cover 13 cover motor 14 relay terminal block 15 relay terminal 16 hub bar Mold 17 3 phase output terminal 18 screw 19a ring 19b ring

Claims (7)

One bearing is placed in the one-piece housing,
The other bearing is placed on the cover motor,
The housing by an axial force generated by the cover motor being axially pinched by a ring-shaped member shrink-fitted or press-fit into the housing, and a cover motor mounting surface formed on the inner peripheral side of the housing. is fixed to,
A three-phase output terminal for outputting three-phase AC power axially extends from the cover motor,
An on- vehicle rotating electrical machine in which a front end portion of the three-phase output terminal is disposed inside the housing and axially inside an axial end portion of the housing . The on-vehicle rotating electrical machine according to claim 1,
  It has a relay terminal that connects the coil of the rotating electrical machine and the three-phase output terminal,
  The relay terminal is an on-vehicle rotating electrical machine passing through a through hole provided in the cover motor. It is a vehicle-mounted rotary electric machine according to claim 1 or 2,
A bus bar mold for covering the three-phase output terminal;
The bus bar mold, vehicle rotary electric machine is fixed to the cover motor. It is a vehicle-mounted rotary electric machine according to any one of claims 1 or 3 ;
A convex portion is provided on a surface on the cover motor side of the ring-shaped member,
A recess is provided on the surface of the cover motor on the side of the ring-shaped member,
An on-vehicle rotating electrical machine in which a convex portion of the ring-shaped member and a concave portion of the cover motor are fitted. It is a rotary electric machine for vehicles according to any one of claims 1 to 4 ,
The in-vehicle rotating electrical machine wherein the ring-shaped member has substantially the same linear expansion coefficient as the housing and the cover motor. An on-vehicle rotary electric machine according to any one of claims 1 to 5 , wherein
An in-vehicle rotating electrical machine in which the ring-shaped member is disposed in a portion of 4 mm or less in thickness of the housing. An on-vehicle rotary electric machine according to any one of claims 1 to 6 , wherein
An on-vehicle rotating electrical machine in which the ring-shaped member is provided substantially at the axial center of the housing.