JP2011091963A - Fixing structure of resolver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing structure of a resolver rotor wherein a required space in axial direction can be reduced even if caulking is employed for rigid fixing. <P>SOLUTION: A fixing structure of a resolver includes an abutting fixing part 81 which abuts with a first resolver member 7a to fix the first resolver member 7a to a fixed part 32 provided to a rotor support member 30 that supports a rotor of a rotary electric machine, a caulking part 83 for positioning and fixing to the fixed part 32 by caulking, and a resolver fixing member 8 that contains a connection part 82 for connecting the abutting fixing part 81 to the caulking part 83. The caulking part 83 extends in the direction parallel to the rotational axis, and the connection part 82 extends in radial direction of the rotational axis, with the resolver fixing member 8 being annular. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a resolver fixing structure that detects a rotational position of a rotor of a rotating electrical machine.

  In a parallel hybrid vehicle having an engine and a rotating electrical machine, and transmitting the output torque to the transmission, either or both of the engine and the rotating electrical machine can obtain a driving force. It is necessary to devise a resolver arrangement space necessary for control. A so-called outer rotor type resolver in which a resolver rotor is attached to the inner periphery of an outer cylindrical portion having a motor rotor disposed on the outer periphery is also known (for example, Patent Document 1). In other words, in this prior art, the resolver rotor is arranged in the inner circumferential space of the outer cylindrical portion as the rotation support of the motor rotor.

Japanese Patent Laid-Open No. 2001-113970 (paragraph number [0008], FIG. 2)

  However, when a constituent member such as a clutch is arranged in the inner circumferential space of the outer cylindrical portion, it is necessary to avoid the constituent member and arrange the resolver rotor on the outer side in the axial direction of the constituent member. The problem arises that it is difficult to ensure a sufficient space in the axial direction. For this reason, it is necessary to shorten the axial length of the structure itself for fixing it including the resolver rotor. By the way, when the resolver rotor is fixed to the fixed portion provided on the rotation support body of the motor rotor by using the fixing member, the fixing member is caulked by the caulking portion extending in the axial direction in order to obtain strong fixing. May be adopted. However, when the caulking structure is employed, it is difficult to shorten the axial length because an axial space for arranging the caulking portion is required.

  An object of the present invention is to provide a resolver rotor fixing structure capable of reducing a required space in the axial direction even if a caulking structure is employed to obtain strong fixing.

In order to achieve the above object, in a fixing structure of a resolver that detects a rotational position of a rotor of a rotating electric machine, a feature of the present invention is that the resolver is provided between the first resolver member and the first resolver member. And a second resolver member that rotates relative to the first resolver member around the rotation axis and that forms a gap in the radial direction of the rotation axis, and a rotor support member that supports the rotor of the rotating electrical machine A contact fixing portion that contacts the first resolver member to fix the first resolver member to the fixed portion provided; and a crimping portion that is fixed to the fixed portion by caulking; A resolver fixing member having a connecting portion for connecting the contact fixing portion and the caulking portion, wherein the caulking portion extends in an axial direction parallel to the rotation axis. The connecting portion extends in a radial direction of the rotation axis, and the resolver fixing member is in the annular body with there.
In the present application, the “rotary electric machine” is used as a concept including a motor (electric motor), a generator (generator), and a motor / generator that functions as both a motor and a generator as necessary.

  According to this configuration, the resolver fixing member that fixes the first resolver member as the resolver rotor to the fixed portion provided in the rotor support member, the contact fixing portion that presses the first resolver member, and the fixed portion The caulking portion and the connecting portion to which they are connected are divided, and since the connecting portion extends in the radial direction, the axial length used for the connecting portion is extremely short, and the caulking portion Since the contact fixing portion is not continuous in the axial direction, a resolver fixing structure in which the axial length is suppressed as a whole is realized.

  In such a fixing structure of the resolver, a configuration in which an annular concave portion into which the annular protrusion of the fixed portion can be fitted is formed between the crimping portion and the contact fixing portion. In this configuration, the annular protrusion of the fixed portion is fitted into the annular recess formed in the resolver fixing member, whereby the fixation between the fixed portion and the resolver fixing member is strengthened.

  Further, the caulking portion extends longer from the contact fixing portion toward the rotor in the axial direction, and the first resolver member is arranged in the radial direction of the caulking portion so as to overlap the caulking portion when viewed from the radial direction. A configuration located inside is also suitable. In this configuration, since the caulking portion overlaps with the first resolver member, the axial length required by the first resolver member and the axial length required by the caulking portion can be overlapped to fix the resolver. This can contribute to the suppression of the axial length of the structure as a whole.

  Furthermore, as one preferred embodiment, if a configuration in which a caulking area is formed at the front end edge of the caulking portion on the rotor side is adopted, one end of the caulking area is a free end, so that smooth In addition, the caulking process can be performed firmly.

  Further, a configuration in which a caulking concave portion formed in the fixed portion to engage the caulking region is provided at a position closer to the rotor than the first resolver member in the axial direction is also preferable. With this configuration, it is possible to avoid the disadvantage that the thickness of the fixed portion that receives the first resolver member is reduced by the caulking recess.

  As one preferred embodiment, if the fixed portion is provided on the side of the rotor in the axial direction, the first resolver member and the second resolver member are aligned in the radial direction on the side of the rotor. As a result, the entire space formed on the inner peripheral side of the rotor can be occupied by a component such as a clutch. Furthermore, by arranging the resolver fixing member so as to overlap with the stator coil end of the rotating electrical machine when viewed from the radial direction, the first resolver member and the second resolver member are formed in a space formed on the inner peripheral side of the stator coil end. Since the resolver member can be disposed, the space can be effectively used.

  The resolver having the resolver member fixed to the rotor by the resolver fixing structure according to the present invention can adopt either an outer rotor type or an inner rotor type. However, in the structure of a general rotating electrical machine, when the outer rotor type is used, the first resolver member and the fixed member are fixed in the outer rotor type compared to the inner rotor type in which the stator side resolver member is attached to the housing or the like in the radial direction. Since the diameter of the portion is larger than that of the inner rotor, it is difficult to fix the first resolver member by press-fitting that requires accurate dimensional alignment. For this reason, in the outer rotor type, the configuration of the present invention using caulking is particularly suitable.

It is a schematic diagram which shows the power transmission system containing the rotary electric machine which employ | adopted one of the embodiment of the fixing structure of the resolver which concerns on this invention. It is an expanded sectional view which shows the resolver fixed area | region of the rotary electric machine by FIG. It is a schematic diagram which shows the process for crimping and fixing a resolver fixing member to a to-be-fixed part. It is an expanded sectional view which shows another embodiment of the fixing structure of a resolver.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 schematically shows a power transmission system including a rotating electrical machine used in a parallel hybrid vehicle. The output shaft 1 a of the engine 1 and the input shaft 3 a of the clutch 3 having a common rotational axis X are connected via a damper 2. Hereinafter, unless otherwise specified, the term “axial direction” or “radial direction” refers to the “axial direction” or “radial direction” of the axis X. The output shaft 3 b of the clutch 3 is connected to the transmission 4. A rotating electrical machine 5 is arranged outside in the radial direction of the clutch 3. The rotating electrical machine 5 includes an inner rotor (hereinafter simply referred to as a rotor) 5a and an outer stator (hereinafter simply referred to as a stator) 5b. The stator 5b has coil ends 5c protruding from the stator core on both sides in the axial direction. The stator 5 b is attached to the inner peripheral surface of the peripheral wall 10 a of the housing 10.

  Although not shown in detail in the drawing, the case body on the clutch output side integrated with the clutch output shaft 3 b is configured as a rotor support member 30 that supports the rotor 5 a of the rotating electrical machine 5. The bosses 10c of the pair of partition walls 10b extending in the radial direction of the housing 10 are rotatably supported. The rotor 5 a of the rotating electrical machine 5 is fixedly supported on the outer peripheral surface of the rotor support member 30. As is clear from FIG. 1, the clutch 3 and the rotating electrical machine 5 are disposed in a space defined by the peripheral wall 10 a of the housing 10 and the pair of partition walls 10 b so as to overlap each other when viewed from the radial direction of the shaft center X.

  As shown in detail in FIG. 2, the rotor support member 30 has a flange portion 31 extending in the radial direction of the axis X in order to create a rotor accommodating region on the outer peripheral surface. An annular fixed portion 32 protrudes in the axial direction of the axis X from one side of the flange portion 31. Thus, the resolver 7 is disposed between the fixed portion 32 positioned on the side of the rotor support member 30 and the boss portion 10 c facing the fixed portion 32 of the housing 10.

  In the parallel hybrid vehicle having the power transmission system configured as described above, the rotating electrical machine 5 is driven as a starter motor when the engine is started. When the vehicle starts, the rotating electrical machine 5 starts by outputting an appropriate torque in accordance with the required torque from the vehicle side. After the start is completed, the clutch 3 directly connects the output shaft 1a of the engine 1 and the transmission so that power can be directly transmitted, and the vehicle travels. In this directly connected state, the rotating electrical machine 5 performs torque assist or power generation depending on the situation. When the vehicle is decelerated, the rotating electrical machine 5 performs regenerative braking and collects the kinetic energy of the vehicle as electric energy.

  The resolver 7 that detects the rotational position of the rotor 5a of the rotating electrical machine 5 forms a gap in the radial direction of the rotational axis X of the rotating electrical machine 5 between the first resolver member 7a and the first resolver member 7a. And a second resolver member 7b that rotates relative to the first resolver member around the rotation axis X. The first resolver member 7a can be configured as an outer rotor or an inner rotor, and the second resolver member 7b can be configured as an outer stator or an inner stator in accordance with the first resolver member 7a. In this embodiment, the 1st resolver member 7a is comprised as an outer rotor, and is comprised as the 2nd resolver member 7b inner stator.

  Next, the fixing structure of the resolver 7 will be described. As shown in FIGS. 2 and 3, in this embodiment, the resolver 7 is of the outer rotor type, and the first resolver member 7 a that is the outer rotor is fixed to the fixed portion 32 of the rotor support member 30 in the form of an annular resolver. The member 8 is used for caulking and fixing. The second resolver member 7b, which is an inner rotor of the resolver 7, is fixed to a mounting surface formed on the boss portion 10c of the partition wall 10b with a bolt.

  The inner peripheral surface of the fixed portion 32 of the rotor support member 30 has a stepped shape, whereby a diameter that becomes a cylindrical portion functioning as an annular protrusion 32a and an abutting surface 32b of the first resolver member 7a. And a step having a surface extending in the direction. Here, an abutting surface 32b is formed radially inward with respect to the inner peripheral surface of the annular protrusion 32a. As is clear from FIG. 3A, the first resolver member 7a is applied by the resolver fixing member 8 with its outer peripheral surface applied to the inner peripheral surface of the annular protrusion 32a and its side surface applied to the abutting surface 32b. Fixed. As shown in FIG. 2, in this embodiment, the fixed part 32 is provided on the axial direction side of the rotor 5a. Further, the first resolver member 7a and the resolver fixing member 8 fixed to the fixed portion 32 are also arranged on the side in the axial direction of the rotor 5a. Thereby, the first resolver member 7a and the resolver fixing member 8 and the rotor 5a are arranged so as to overlap each other when viewed from the axial direction.

  The resolver fixing member 8 is an annular body as a whole, and includes a contact fixing portion 81, a caulking portion 83, and a connecting portion 82 that are integrally formed. The contact fixing portion 81 has an annular shape having a contact surface that contacts the side surface of the first resolver member 7a, and its axial length is relatively short. The crimping portion 83 is an annular body whose tip region is thinned to form a crimping region 83a that can be easily deformed, and its axial length is longer than that of the contact fixing portion 81. The connecting portion 82 has a function of connecting the contact fixing portion 81 and the crimping portion 83 and creating a radial interval therebetween. Therefore, an annular recess 84 is formed between the contact fixing portion 81 and the crimping portion 83. The annular recess 84 has a size and shape into which the annular protrusion 32a formed on the fixed portion 32 is press-fitted. In addition, the connection form of the annular recess 84 and the annular protrusion 32a is not limited to press-fitting but may be a simple fit.

  When the first resolver member 7a is fixed to the fixed portion 32, the resolver is fixed so that the annular protrusion 32a of the fixed portion 32 is first press-fitted into the annular recess 84 as shown in FIG. The member 8 is fitted into the fixed portion 32. As a result, the contact fixing portion 81 of the resolver fixing member 8 contacts the side surface on the one axial side of the first resolver member 7a, and the first resolver member 7a contacts and fixes the abutting surface 32b of the fixed portion 32. It is sandwiched between the part 81. Thereafter, as shown in FIG. 3C, the caulking area 83 a of the caulking portion 83 is caulked with respect to the root area of the fixed portion 32. In this embodiment, a caulking recess 32 c for engaging the caulking area 83 a of the caulking portion 83 is formed in the fixed portion 32 in order to strengthen the caulking. The caulking recess 32c is provided at a position closer to the rotor 5a than the first resolver member 7a in the axial direction. More specifically, it is formed by denting the outer peripheral surface of the root region of the fixed portion 32, that is, the end region on the axial rotor side of the fixed portion 32 inward in the radial direction. The caulking surface of the caulking recess 32c is formed as an inclined surface. Thereby, the resolver fixing member 8 is fixed to the fixed portion 32 in the axial direction and the radial direction, and the first resolver member 7 a sandwiched between the fixed portion 32 and the resolver fixing member 8 is fixed to the fixed portion 32. Securely fixed.

  When the resolver 7 is fixed using the resolver fixing member 8 having the above-described configuration, the crimping portion 83 extends in a direction parallel to the rotation axis X and the connection portion 82 rotates as can be understood from FIG. It extends in the radial direction of the axis X. In the present embodiment, such a configuration is such that the caulking portion 83 is cylindrical and is fitted on the outer peripheral surface of a cylindrical annular protrusion 32a formed in parallel to the rotation axis X. This is realized by the connection portion 82 being formed so as to extend radially inward from an end portion on one axial side of the crimping portion 83 (opposite side to the rotor 5a side). Furthermore, as described above, the first resolver member 7a is disposed in contact with the rotor 5a side of the contact fixing portion 81. The caulking portion 83 is longer in the axial direction than the contact fixing portion 81, and the caulking region 83a at the tip portion on the rotor 5a side is disposed in the axial direction at a position closer to the rotor 5a than the first resolver member 7a. Has been. As a result, the crimping portion 83 extends longer to the rotor side in the axial direction than the contact fixing portion 81, and the first resolver member 7a is located on the radially inner side of the crimping portion 83 so as to overlap the crimping portion 83 when viewed from the radial direction. positioned. Further, as described above, the first resolver member 7a and the resolver fixing member 8 are disposed adjacent to the axial direction side of the rotor 5a. For this reason, the coil end 5c protruding in the axial direction from the stator core is disposed on the radially outer side of the first resolver member 7a and the resolver fixing member 8. Therefore, the resolver fixing member 8 is disposed so as to overlap the coil end 5c of the stator 5b of the rotating electrical machine 5 when viewed from the radial direction. That is, the resolver 7, the resolver fixing member 8, the fixed portion 32, and the coil end 5c of the stator 5b are arranged so as to overlap each other when viewed from the radial direction of the rotation axis X, and are arranged so as to overlap each other in the axial direction. Therefore, as a whole, a resolver rotor fixing structure in which the axial space is effectively used is realized.

[Another embodiment]
(1) In the above-described embodiment, the resolver 7 is configured in an outer rotor type in which the first resolver member 7a as a resolver rotor is disposed on the radially outer side of the second resolver member 7b as a resolver stator. The resolver fixing structure according to the present invention is also applied to an inner rotor type resolver 7 in which a first resolver member 7a as a resolver rotor is disposed radially inside a second resolver member 7b as a resolver stator. FIG. 4 shows an example of an embodiment in which the resolver fixing structure according to the present invention is applied to such an inner rotor type resolver 107. Here, the 2nd resolver member 107b as a resolver stator is arrange | positioned in the space between the to-be-fixed part 132 and the coil end 5b. The cross-sectional shapes of the fixed portion 132 and the resolver fixing member 108 are shapes in which the radially inner side and the outer side are interchanged with respect to the previous embodiment, but the contact fixing portion 181, the crimping portion 183, and the connecting portion 182. The dimensional shape and the operation and effect thereof are substantially the same.
(2) In the above-described embodiment, the caulking area 83a is selected to be continuous over the entire circumference, but instead of this, an intermittent comb-like caulking area 83a may be formed along the circumference.

  The resolver fixing structure according to the present invention can be applied not only to a resolver for controlling a rotating electrical machine mounted on a vehicle such as an electric vehicle or a hybrid vehicle, but also to a resolver for controlling a rotating electrical machine used for various purposes.

3: Clutch 5: Rotating electric machine 5a: Rotor 5b: Stator 5c: Coil end 7: Resolver 7a: Resolver rotor (first resolver member)
7b: Resolver stator (second resolver member)
8: Resolver fixing member 81: Contact fixing part 82: Connection part 83: Caulking part 84: Annular recess 32: Fixed part 32a: Annular protrusion 32b: Abutting surface 32c: Caulking recess

Claims (8)

A resolver fixing structure for detecting the rotational position of the rotor of the rotating electrical machine,
The resolver forms a gap in the radial direction of the rotational axis of the rotating electrical machine between the first resolver member and the first resolver member, and rotates relative to the first resolver member around the rotational axis. A second resolver member
A contact fixing portion that contacts the first resolver member to fix the first resolver member to a fixed portion provided on a rotor support member that supports a rotor of the rotating electrical machine, and the fixed portion And a resolver fixing member having a caulking portion that is fixed by caulking, and a connection portion that connects the contact fixing portion and the caulking portion,
A resolver fixing structure in which the crimping portion extends in an axial direction parallel to the rotation axis, the connection portion extends in the radial direction of the rotation axis, and the resolver fixing member is an annular body.   2. The resolver fixing structure according to claim 1, wherein an annular recess is formed between the caulking portion and the contact fixing portion, into which an annular protrusion of the fixed portion can be fitted.   The caulking portion extends longer to the rotor side in the axial direction than the contact fixing portion, and the first resolver member is radially inward of the caulking portion so as to overlap the caulking portion when viewed from the radial direction. The fixing structure of the resolver according to claim 1 or 2, which is located.   The resolver fixing structure according to claim 3, wherein a caulking region is formed at a front end edge of the caulking portion on the rotor side.   The resolver fixing according to claim 4, wherein a caulking concave portion formed in the fixed portion to engage the caulking region is provided at a position closer to the rotor side than the first resolver member in the axial direction. Construction.   The resolver fixing structure according to claim 1, wherein the fixed part is provided on an axial side of the rotor.   The resolver fixing structure according to any one of claims 1 to 6, wherein the resolver fixing member is disposed so as to overlap with a stator coil end of the rotating electrical machine when viewed from the radial direction. The resolver fixing structure according to any one of claims 1 to 7, wherein the resolver is of an outer rotor type in which the first resolver member is disposed radially outside the second resolver member.

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