JP5861536B2 - Rectifier for rotating electrical machine - Google Patents

Description

  The present invention relates to a rectifier for a vehicle AC generator mounted on a vehicle such as an automobile.

The rotating electrical machine includes a rectifier fixed to a frame, and the rectifier includes fins to which a rectifier element is fixed.
For example, in a rectifying device for a rotating electrical machine described in Patent Document 1, as shown in FIG. 11, a rectifying element 101 is fixed to a fin 102, and a terminal 104 held by a terminal block 103 separate from the fin 102. Is connected to the lead wire 105 of the rectifying element 101.

  Conventionally, as shown in FIG. 11, the lead wire 105 extends in the Z direction, the distal end portion 106 of the terminal 104 extending in the X direction from the terminal block 103 is bent in the Z direction, and the distal end portion 106 is joined to the lead wire 105. doing.

However, in this connection mode, when the terminal block 103 and the fin 102 are relatively moved relative to each other due to vibration or the like, the terminal 104 and the lead wire 105 may be separated.
Therefore, in Patent Document 1, as shown in FIG. 11, an arc-shaped bent portion 109 (vent) that absorbs displacement is provided on the lead wire 105 side.
Patent Document 2 also discloses a technique for providing a vent on a lead wire (connection lead) of a rectifying element.

JP 2009-1331018 A International Publication No. 2009/153850 Pamphlet

However, the techniques of Patent Documents 1 and 2 cannot absorb vibration when it is difficult to provide a vent on the lead wire.
Further, in the conventional connection mode, when vibration in the Z direction occurs, the terminal absorbs displacement by bending deformation. However, even if displacement absorption due to deflection is taken into consideration, a large stress is applied to the terminal.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to reduce stress applied to a terminal during vibration in a connection mode between a lead wire of a rectifying element of a rotating electrical machine and a terminal.

  A rectifying device for a rotating electrical machine according to the present invention includes a first member to which a rectifying element is fixed, a second member that is separate from the first member fastened to the first member, and a rectifying element that is held by the second member. And a terminal connected to the lead wire.

Assuming that three directions orthogonal to each other are an X direction, a Y direction, and a Z direction, the lead wire extends in the Z direction, and the terminal is separated from the second member at a position spaced at least in the X direction and the Y direction with respect to the lead wire. It protrudes.
The terminal is a cantilever rod projecting from the second member, and has a root portion extending in a predetermined direction and a tip portion connected from the root portion via a bent portion and extending in a direction different from the predetermined direction. And a connecting portion connected to the lead wire on the distal end side of the distal end portion.
And a connection part is located in the position shifted | deviated to the Y direction and the Z direction, or the position shifted | deviated to the Y direction with respect to the virtual line extended along a root part.

  According to this, when relative movement occurs between the first member and the second member due to vibration or the like, the terminal is twisted and deformed. That is, in the present invention, since the terminal absorbs the displacement by twisting deformation in addition to the deflection, the distortion of the terminal can be reduced. That is, the stress applied to the terminal during vibration can be reduced.

(Example 1) which is sectional drawing of a rotary electric machine. (Example 1) which is a top view of a rectifier. (A) is a top view of the connection part of a rectifier and a terminal, (b) is sectional drawing of the connection part of a rectifier and a terminal (Example 1). It is a figure explaining the softness of the conventional terminal (conventional example). (Example 1) which is explanatory drawing explaining the softness of a terminal. (A) is a top view of the connection part of a rectifier and a terminal, (b) is sectional drawing of the connection part of a rectifier and a terminal (Example 2). (A) is a top view of the member before the bending process which forms a terminal, (b) is a top view of the connection part of a rectifier and a terminal, (c) is sectional drawing of the connection part of a rectifier and a terminal (Example 3). (A) is a top view of the member before the bending process which forms a terminal, (b) is a top view of the connection part of a rectifier and a terminal, (c) is sectional drawing of the connection part of a rectifier and a terminal (Example 4). (A) is a top view of the member before the bending process which forms a terminal, (b) is a top view of the connection part of a rectifier and a terminal, (c) is sectional drawing of the connection part of a rectifier and a terminal (Example 4). (A) is a top view of the member before the bending process which forms a terminal, (b) is a top view of the connection part of a rectifier and a terminal, (c) is sectional drawing of the connection part of a rectifier and a terminal (Example 4). It is a figure explaining the connection aspect of the rectifier of a rectifier and a terminal (conventional example).

  The mode for carrying out the present invention will be described in detail with reference to the following examples.

[Example 1]
[Configuration of Example 1]
The structure of the rotary electric machine 1 of a present Example is demonstrated using FIGS.
The rotating electrical machine 1 is an AC generator for a vehicle, and includes a rotor 2, a stator 3, a frame 4, a brush 5, a regulator 6, a rectifying device 7, a protective cover 8, and the like.

  The rotor 2 is wound around a rotating shaft 2a to which a rotational force is transmitted from an engine (not shown) via a belt (not shown) and a pulley 11, a pole core 2b fixed to the rotating shaft 2a, and a pole core 2b. A field winding 2c is provided.

The stator 3 includes an annular stator core 3a and a stator winding 3b wound around the stator core 3a.
As the rotor 2 rotates, an alternating voltage is induced in the stator winding 3b.

  The frame 4 surrounds the periphery of the stator 3 and the rotor 2, and includes a front frame 4a that supports one end of the rotating shaft 2a and a rear frame 4b that supports the other end of the rotating shaft 2a.

The brush 5 is in sliding contact with a slip ring 12 provided on the other end side of the rotating shaft 2a, and supplies a field current to the field winding 2c.
The regulator 6 is disposed on the outer side in the radial direction of the rotation shaft 2a with respect to the position where the brush 5 is disposed.

The rectifier 7 is fixed to the other axial end of the rear frame 4b and rectifies the AC voltage output from the stator winding 3b, and has a rectifier circuit including a plurality of rectifier elements 15. doing.
The rectifier 7 includes a positive electrode heat radiation fin 16 and a negative electrode heat radiation fin 17 that are stacked in the axial direction, and a terminal block 18 that is disposed between the positive electrode heat radiation fin 16 and the negative electrode heat radiation fin 17 in the axial direction.
The positive electrode heat radiation fin 16, the negative electrode heat radiation fin 17, and the terminal block 18 are fastened in the axial direction by screw fastening or the like.

The positive-electrode radiating fin 16 and the negative-electrode radiating fin 17 each have a plate shape whose axial direction is the plate thickness direction. The positive-electrode radiating fin 16 has a positive-side rectifying element 15 fixed thereto. The rectifying element 15 on the negative electrode side is fixed to the.
The lead wire 15a of the rectifying element 15 protrudes toward the terminal block 18 in the axial direction.

The terminal block 18 is made of an insulating material, and is provided so as to avoid the position of the lead wire 15a. The side surface of the terminal block 18 is opposed to the lead wire 15a by a predetermined distance.
The terminal block 18 holds a terminal 20 for electrically connecting the rectifying elements 15 to each other. The terminal 20 is formed of a metal rod-like member having a circular cross section.

  The protective cover 8 is a resin molded product, for example, and is fixed to the rear frame 4 b so as to cover the brush 5, the regulator 6, and the rectifying device 7.

[Features of this embodiment]
A connection mode between the terminal 20 and the rectifying element 15 which is a feature of the present embodiment will be described with reference to FIG.
In the following description, the positive-side rectifying element 15 is described as an example, but the connection mode between the negative-side rectifying element 15 and the terminal 20 is the same.

Assuming that three directions orthogonal to each other are an X direction, a Y direction, and a Z direction, the lead wire 15a extends in the Z direction, and the terminal 20 is separated at least in the X direction and the Y direction with respect to the central axis of the lead wire 15a. It is a cantilever bar that protrudes from the terminal block 18 at the position.
In the present embodiment, the Z direction is the axial direction of the rotating shaft 2a.

  That is, the rectifying element 15 is fixed to the positive electrode heat radiation fin 16 so that the lead wire 15a is arranged at a position facing the X-direction end face 18a of the terminal block 18, and the lead wire 15a extends in the Z direction. The base 18 is separated from the end face 18a in the X direction by a predetermined distance. And the terminal 20 protrudes from the X direction end surface 18a in the Y direction position different from the Y direction position of the lead wire 15a.

The terminal 20 protrudes from the terminal block 18 and extends in the X direction, a tip 20c connected from the root 20a via the bent portion 20b and extending in a direction different from the X direction, and the tip of the tip 20c. And a connecting portion 20d connected to the lead wire 15a on the side.

  The rectifying element 15 is fixed to the positive electrode heat radiating fin 16 so that the lead wire 15a is disposed at a position facing the end surface 18a of the terminal block 18 in the X direction. The lead wire 15a extends in the Y direction, and is separated from the X direction end face 18a of the terminal block 18 by a predetermined distance.

The terminal 20 is formed by bending a round bar, and one side of the bent portion 20b is a root portion 20a, and the other side of the bent portion 20b is a tip portion 20c.
The root portion 20a extends in the X direction from the X direction end face 18a. A distal end portion from the root portion 20a is two-dimensionally bent in an XY plane by a bending portion 20b to form a distal end portion 20c extending in a direction different from the X direction, and the connecting portion 20d at the distal end of the distal end portion 20c is a lead wire. 15a abuts. Then, the connecting portion 20d and the lead wire 15a are joined by Tig welding or the like.

  According to this, the connecting portion 20d is located at a position shifted in the Y direction with respect to the virtual line Q extending from the root portion 20a in the X direction.

[Effects of this embodiment]
The rectifying device 7 of this embodiment includes a positive electrode heat radiation fin 16 and a negative electrode heat radiation fin 17 (first member) to which a rectifying element 15 is fixed, and a terminal block 18 (first element) fastened to the positive electrode heat radiation fin 16 and the negative electrode heat radiation fin 17. 2 members).
The terminal 20 held by the terminal block 18 includes a root portion 20a that protrudes from the terminal block 18 and extends in the X direction, and a distal end portion 20c that extends from the root portion 20a via the bent portion 20b and extends in a direction different from the X direction. And a connecting portion 20d connected to the lead wire 15a on the tip side of the tip portion 20c.
And the connection part 20d is located in the position shifted | deviated to the Y direction with respect to the virtual line Q extended in the X direction from the root part 20a.

According to this, in FIG. 3, for example, when relative movement occurs in the Z direction between the positive electrode heat radiation fin 16 and the terminal block 18, the terminal 20 is bent and twisted. That is, relative displacement is absorbed by torsional deformation in addition to flexural deformation.
For this reason, the distortion of the terminal 20 can be reduced. That is, the stress applied to the terminal 20 during vibration can be reduced.

  Here, the spring constants of the terminal 104 of the conventional example and the terminal 20 of this embodiment are compared. FIG. 4 schematically shows the connection mode of the conventional example, and FIG. 5 schematically shows the connection mode of the present embodiment.

Conventionally, as shown in FIG. 4, a connection portion with a lead wire exists on an extension line where the terminal 104 extends from the terminal block 103.
Here, when the length of the terminal 104 protruding from the terminal block 103 is L, the outer diameter of the terminal 104 is D, and the spring constant K ₀ due to the deflection of the terminal 104 is calculated,
K ₀ = 3πD ⁴ E / L ³
(E is the longitudinal elastic modulus).
Here, when the reciprocal of the spring constant is an index S of softness (ease of deformation),
S = 1 / K ₀ = L ³ / 3πD ⁴ E
It becomes.

Similarly, the spring constant of the terminal 20 of this embodiment is also calculated.
In this embodiment, the calculation is performed separately for the root portion 20a and the tip portion 20c, and the rigidity in each portion is summed.
The length of the root portion 20a is αL (0 <α <1), and the length of the tip portion 20c is L (1-α). In other words, the total length of the root portion 20a and the tip portion 20c is L, and the terminal 20 is obtained by bending the terminal 20 having the length L in FIG.
First, the spring constant due to deflection at the tip 20c is:
K ₁ = (3πD ⁴ E / L ³ ) · (1 / (1-α)) ³
It becomes.

Next, the spring constant due to deflection and twisting at the root portion 20a is
K ₂ = (3πD ⁴ E / L ³ ) · [1 / {128 (1-α) (1+ (sin θ) ² ) ^0.5 }]
It becomes.
Therefore, the softness index S is
S = 1 / K ₁ + 1 / K ₂ = L ³ / 3πD ⁴ E · [(1-α) ³ +128 (1-α) {1+ (sin θ) ² } ^0.5 ]
It becomes. Note that θ is a bending angle (0 ° ≦ θ ≦ 90 °) at the bending portion 20b.

Since [(1-α) ³ +128 (1-α) {1+ (sin θ) ² } ^0.5 ] is a value greater than 1, the terminal 20 of this embodiment may be softer than the conventional terminal 104. Recognize. That is, it can be seen that the terminal 20 is easily deformed and easily absorbs the displacement due to the relative movement between the positive electrode heat radiation fin 16 and the terminal block 18.

  In this embodiment, each of the root portion 20a and the tip portion 20c is linearly extended as one embodiment, but may be extended in a predetermined direction while meandering.

[Example 2]
A rectifier 7 according to a second embodiment will be described with reference to FIG. 6 with a focus on differences from the first embodiment. In addition, the same code | symbol as Example 1 shows the same structure, Comprising: The previous description is referred.
In this embodiment, the terminal 20 is bent at the bent portion 20b not only on the XY plane but also on the XZ plane so that the distal end portion 20c approaches the upper end side of the lead wire 15a. That is, it is bent three-dimensionally rather than two-dimensionally.

According to this, the connecting portion 20d is located at a position shifted in the Y direction and the Z direction with respect to the virtual line Q extending from the root portion 20a in the X direction.
And the bending part 20b, the connection part 20d, and the edge part by the side of the terminal base 18 of the base part 20a become a three-dimensional positional relationship which does not exist in the same plane shape.
Also by this, the same effect as Example 1 can be produced.

Example 3
A rectifier 7 according to a third embodiment will be described with reference to FIG. 7 with a focus on differences from the second embodiment. In addition, the same code | symbol as Example 1 shows the same structure, Comprising: The previous description is referred.
In this embodiment, the terminal 20 is formed by a band-shaped member 23 having a rectangular cross section.
By bending the belt-like member 23 of FIG. 7A along a line (broken line portion) inclined with respect to the length direction and the width direction, as shown in FIGS. 7B and 7C, the terminal of the root portion 20a The end portion on the side of the base 18, the bent portion 20b, and the connecting portion 20d can be in a three-dimensional positional relationship.
Thereby, there can exist the same effect as Example 1 and 2. FIG.

In the present embodiment, the lead wire 15a has a bent portion 24 that absorbs the force applied to the lead wire 15a. The bent portion 20b has a bent shape structure bent in an arc shape.
According to this, vibration transmission can be mitigated, and displacement can be absorbed by both the terminal 20 and the lead wire 15a, so that distortion generated in the terminal 20 and the lead wire 15a due to vibration can be further reduced.

Example 4
A rectifier 7 according to the fourth embodiment will be described with reference to FIG. 8 with a focus on differences from the second embodiment. In addition, the same code | symbol as Example 1 shows the same structure, Comprising: The previous description is referred.
In this embodiment, it is formed by bending an L-shaped member 25 (see FIG. 8A) having a rectangular cross section punched into an L shape.

  The L-shaped member 25 has a first piece 25a extending linearly and a second piece 25b extending perpendicularly from the tip of the first piece 25a. Then, by bending at the boundary line between the first piece 25a and the second piece 25b, the first piece 25a forms the root portion 20a, the second piece 25b forms the tip portion 20c, FIG. ), The end of the base portion 20a on the terminal block 18 side, the bent portion 20b, and the connecting portion 20d can be in a three-dimensional positional relationship.

The connecting portion 20d is formed by bending the tip of the second piece 25b so that a part of the tip of the tip 20c extends in the Z direction. The connecting portion 20d contacts the lead wire 15a from one end side in the Y direction.
Thereby, there can exist the same effect as Example 1 and 2. FIG.

As shown in FIG. 9, the first piece 25a and the second piece 25b before bending may intersect at an obtuse angle. In this case, similarly, by bending at the boundary line between the first piece 25a and the second piece 25b, the first piece 25a forms the root portion 20a, the second piece 25b forms the tip portion 20c, and FIG. As shown in b) and (c), the end of the base portion 20a on the terminal block 18 side, the bent portion 20b, and the connecting portion 20d can be in a three-dimensional positional relationship.
Further, in this embodiment, compared to the case of the third embodiment, it is possible to ensure a long length of the distal end portion 20c and to further reduce the strain.

Further, in the L-shaped member 25 shown in FIG. 9, a protruding piece 25c protruding inward of the L shape may be provided at the tip of the second piece 25b, and the protruding piece 25c may be used as the connecting portion 20d (FIG. 10A). reference).
In this case, as shown in FIGS. 9B and 9C, the connecting portion 20d can be brought into contact with the lead wire 15a from the other end side in the Y direction.

[Modification]
In the first to fourth embodiments, the first member to which the rectifying element 15 is fixed is the positive electrode radiating fin 16 and the negative electrode radiating fin 17, but the first member may be the frame 4.
In the first to fourth embodiments, the root portion 20a extends in the X direction. However, the root portion 20a may extend in any direction without being limited to the X direction. That is, it may not be horizontal with respect to the Z direction, and may be inclined.

1 rotating electric machine, 7 rectifier, 15 rectifier, 15a lead wire,
16 positive electrode heat radiation fin (first member), 17 negative electrode heat radiation fin (first member),
18 terminal block (second member), 20 terminal, 20a root part, 20b bent part,
20c tip part, 20d connection part, Q virtual line

Claims (3)

A first member (16, 17) to which the rectifying element (15) is fixed;
A second member (18) separate from the first member (16, 17) fastened to the first member (16, 17);
A rectifier for a rotating electrical machine having a terminal (20) connected to a lead wire (15a) of the rectifier element (15) held by the second member (18),
If three directions orthogonal to each other are defined as an X direction, a Y direction, and a Z direction,
The lead wire (15a) extends in the Z direction,
The terminal (20) is a cantilevered bar-like member protruding from the second member (18) at a position spaced at least in the X direction and the Y direction with respect to the lead wire (15a), and the second member A root portion (20a) that protrudes from (18) and extends in a predetermined direction, and a tip portion (20c) that connects from the root portion (20a) via a bent portion (20b) and extends in a direction different from the predetermined direction. A connecting portion (20d) connected to the lead wire (15a) on the tip side of the tip portion (20c),
The connection part (20d) is located at a position shifted in the Y direction and the Z direction or a position shifted in the Y direction with respect to a virtual line extending along the root part (20a). Electric rectifier.


In the rectifier of the rotating electrical machine according to claim 1,
The tip portion (20c) and the root portion (20a) each extend linearly, and the rectifier of a rotating electrical machine. In the rectifier for a rotating electrical machine according to claim 1 or 2,
The said lead wire (15a) has the bending part (24) which absorbs the force added to the said lead wire (15a), The rectifier of the rotary electric machine characterized by the above-mentioned.

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