JP2005130583A - Female type terminal fittings, brush assembly and motor with brush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide female type terminal fittings in which a drawing yield strength of a plate-like male terminal is improved by eliminating an antinomy of strengthening of an elastic holding force and enlarging of a contact area. <P>SOLUTION: The female type terminal fittings 12 include a receiving plate 31 having a plate width surface for guiding a plate-like male type terminal 50 to be inserted in a slidable manner in a depth direction and relatively plate longitudinal direction, and a connector 30 having a pair of left and right curling parts 32, 32 extended forward of the plate width surface integrally from left and right sides of this receiving plate 31 and bent molded reversely rotatably to each other. Filament board thickness faces X, X of a width direction in each curling part 32 are separately opposed to the plate width surface. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a female terminal fitting suitable for use in a brush assembly of a motor with a brush.

In a motor with a brush, a female terminal fitting for inserting and receiving an external plate-shaped male terminal and supplying power to the internal brush has an elastic opposing leg as disclosed in Japanese Utility Model Laid-Open No. 5-39165. A U-shaped configuration is known. The distance between the center portions of the opposing leg portions is small, and a plurality of grooves for ensuring a close contact area are formed in each opposing leg portion. When the plate-like male terminal is inserted between the opposing leg portions, the plate-like male terminal is sandwiched in a surface contact manner at the flattened curved central portion of the opposing leg portion.
5-39165 (Summary)

  (1) In the U-shaped female terminal fitting described above, the elastic clamping force of the opposing leg portion is surely increased according to the thickness of the plate-like male terminal inserted between the opposing leg portions, but the thickness is In a fixed case, the product of the contact area and the contact pressure per unit area is equal to the elastic clamping force as the effective contact pressure. It cannot be expected in principle.

  (2) Since the portion holding the plate-shaped male terminal by surface contact is limited to the curved central portion of the opposing leg, the plate-shaped male terminal is in surface contact with the entire surface of the central portion. The contact area no longer increases and remains constant.

  (3) Further, if the opposing leg portion of the female terminal fitting is also lengthened in order to enlarge the area of the bent central portion, the elastic coefficient becomes smaller and the elastic clamping force becomes weaker.

  That is, in the female terminal fitting, the elastic clamping force is inversely proportional to the longest insertion depth of the plate-shaped male terminal, and the process of gradually increasing the contact area that also functions as a friction surface is limited to a part of the longest insertion depth. Therefore, the enhancement of the elastic clamping force and the expansion of the contact area are contradictory to each other, and an improvement in the punching strength with respect to the plate-like male terminal cannot be expected.

  Therefore, in view of the above problems, the first problem of the present invention is that the female type capable of improving the pulling strength of the plate-like male terminal by eliminating the two-way conflict between the enhancement of the elastic clamping force and the expansion of the contact area. It is to provide terminal fittings.

  A second object of the present invention is to provide a brush assembly including the female terminal fitting.

  The third object of the present invention is to provide a motor with a brush using a brush assembly provided with the female terminal fitting.

  In order to solve the above-described problems, the female terminal fitting according to the present invention has a receiving plate portion having a plate width surface that guides the inserted plate-shaped male terminal so as to be relatively slidable in the depth direction of the plate length. And a pair of left and right curling portions that integrally extend from the left and right sides of the receiving plate portion to the front of the plate width surface and are bent in the opposite directions. The thick strip surface in the width direction is spaced apart from the plate width surface.

  When the plate-shaped male terminal is inserted while being brought into sliding contact with the plate width surface of the plate portion, at the beginning of the insertion, only the front end of the two linear strip thick surfaces in the pair of left and right curling portions is the plate-shaped male terminal. Therefore, the entire shape of the pair of left and right curling portions is elastically distorted to a tilt posture. After that, as the insertion depth gradually increases, the length of the curling part gradually returns to the plate surface of the male plate terminal of the two thick strips in the curling part, so that the attitude of the curling part gradually returns. At the same time, the elastic clamping force gradually increases, so that the elastic clamping force is maximized at the end of insertion. This maximum elastic clamping force is proportional to the width direction dimension of the curling part, and since the longest insertion depth direction is the width direction, the elastic coefficient of the curling part increases as the longest insertion depth increases, and the maximum elastic clamping force Can be significantly enhanced. In addition, as the insertion becomes deeper, the contact area of the plate-shaped male terminal that contacts the receiving plate portion gradually increases, so that the contact area can be increased. In addition to this, the plate width surface of the receiving plate portion is in surface contact with the plate surface of the inserted plate-shaped male terminal with the maximum contact area, and the two strips of plate strip bite are pressed against each other. The front ends of the thick strips of the pair of left and right curling portions have a reverse curling action on the plate surface against the removal of the plate-like male terminal. Accordingly, the pulling strength of the plate-like male terminal is greatly improved.

  The female terminal fitting integrally includes a connector portion on one end side of the mounting portion and a connecting portion on the other end side of the mounting portion. And as a brush assembly, a brush spring is fixed to a connection part, and a brush is attached to this brush spring.

  As a motor with a brush, a pair of the brush assemblies described above is used, and the mounting portion is incorporated symmetrically with the connector portion side being disposed outside the groove on the inner wall surface side of the end lid. For this reason, the length direction of the receiving plate of the connector section is not perpendicular to the motor axis direction, so that the pulling strength of the plate-shaped male terminal is improved by extending the longest insertion depth dimension or the end cover The motor shaft length can be shortened by suppressing the thickness dimension.

  As each attachment portion, it is desirable that the attachment portion has a leaf spring for elastically contacting the inner surface of the groove. The punching strength of the female terminal fitting against the end cover can be improved.

  The longer the length of the backing plate, the more the elastic pinching force of the curling part increases, the two strips of the thick plate edge bite in contact with each other, and the front end of the thick strip of the curling unit is a plate-shaped male Since the plate surface is reversely repelled against the removal of the terminal, the pulling strength of the plate-shaped male terminal is greatly improved.

  Next, embodiments of the present invention will be described with reference to the accompanying drawings.

  1A is a perspective view showing a motor with a small brush according to an embodiment of the present invention, FIG. 1B is a longitudinal sectional view of the motor, FIG. 2 is an assembled perspective view of the motor, and FIG. Is a perspective view showing a brush assembly used in the motor, FIG. 3B is a perspective view of the brush assembly as seen from another viewpoint, FIG. 4 is an assembly perspective view of the brush assembly, and FIG. FIG. 6A is a perspective view showing an end cover used for the motor, and FIG. 6B is a top view showing the end cover partly cut away. 6 (C) is a front view of the end cover, FIG. 6 (D) is a cross-sectional view showing a state cut along the line dd ′ in FIG. 6 (C), and FIG. FIG. 8A is a front view of the end cover showing a state in which the brush assembly is incorporated in the end lid, and FIG. 8B is the assembled brush assembly. The front view of the end cover which shows the state which inserted and attached the plate-shaped male terminal to the female terminal metal fitting, FIG. 9 (A) is the state just before inserting the plate-shaped male terminal into the female terminal metal fitting. FIG. 9B is a front cross-sectional view showing the state immediately before, FIG. 10A is a front cross-sectional view showing an initial insertion state of the plate-like male terminal with respect to the female terminal fitting, and FIG. FIG. 10B is a front sectional view showing a state in which the same male terminal is inserted into the female terminal fitting, and FIG. 10C shows a final insertion state of the male male terminal in the female terminal fitting. It is front sectional drawing.

  As shown in FIGS. 1 to 3, the small brush motor of this example includes a motor case 1 having an oval cross section, permanent magnets 2 and 2 positioned on the opposite curved inner surfaces, and a motor shaft 3. It has a three salient pole armature 4 that penetrates, and a pair of brush assemblies 10 and 10 incorporated in a substantially oval concave resin end cover 5 that also serves as a brush substrate.

  The resin end cover 5 is attached to the opening of the motor case 1, and has a metal housing portion which will be described later, and the radial bearing 6 press-fitted into the metal housing portion and the end plate portion 1 a of the motor case 1. Both end sides of the motor shaft 3 penetrate through the radial bearing 7 press-fitted into the burring portion. The armature 4 has an armature core 4a of a laminated magnetic plate that is formed in three salient poles through the motor shaft 3, and a winding coil 4b wound around the armature core 4a. A commutator holder 8 made of resin is fitted on the end cover 5 side of the motor shaft 3, and a commutator 9 is fastened and fixed to the outer peripheral surface of the commutator holder 8 with a washer. A ring varistor R is fixed on the riser 9 a of the three commutator pieces constituting the commutator 9. The block-like carbon brush 16 attached to the brush spring 15 of each brush assembly 10 is in sliding contact with the outer peripheral surface of the commutator 9. Note that W is a resin thrust washer for absorbing play in the thrust direction of the motor shaft.

  The pair of brush assemblies 10 and 10 have the same configuration, and each brush assembly 10 includes a conductive female terminal fitting 12, a conductive leaf spring-like brush spring 15 and carbon, as shown in FIGS. And brush 16.

  The female terminal fitting 12 has a plate-like mounting portion 20 for assembling at a predetermined location of the end lid 5, a connector portion 30 for connecting a plate-like male terminal described later, and a brush spring 15. This is a single-sheet press-molded product made of silver and provided with a connecting piece 40 integrally.

  The mounting portion 20 has projecting pieces 22 and 22 that extend in the opposite direction from the central portion 21 that has one end communicating with the receiving plate portion 31 of the connector portion 30 and the other end communicating with the connecting piece portion 40. Steps S and S are formed on both side edges extending from one overhanging piece 22 through the central portion 21 to the other overhanging piece 22, and the rigidity of the mounting portion 20 is increased by increasing the section modulus. . A rectangular leaf spring P is formed at a substantially central portion of each overhanging piece 22 and is slightly cut and raised by three-way cutting.

  As shown well in FIG. 3 (B), the connector portion 30 extends from the central portion 21, bends at a substantially right angle and hangs down, and a substantially rectangular receiving plate portion 31, and the left and right sides of the receiving plate portion 31. It has a pair of left and right dome-shaped curling portions 32, 32 that integrally extend to the front of the plate width surface and are bent about 270 ° in opposite directions. A narrow projecting piece 31 a projects downward from the center of the lower end of the receiving plate portion 31. And the linear board thickness surface X of the width direction (hanging direction of the receiving plate part 31) in each curling part 32 is separated and opposed to the plate width surface of the receiving plate part 31 (refer FIG. 9 (A)).

  As shown in FIG. 4, the connecting piece portion 40 includes a pair of flange portions 41 a and 41 a that extend from the central portion 21, bend at a substantially right angle, hang down, are parallel to the receiving plate portion 31, and are projected.

  The brush spring 15 is made of highly tough and conductive beryllium copper, and has a substantially H-shaped retaining hole Q into which the brush 16 is fitted and latches, and a brush holder portion 15a formed by folding both side edges back. And a substantially T-shaped cantilever part 15b extending integrally from the upper end of the brush holder part 15a, and the upper piece of the beam part 15b has a pair of flange parts 41a, A pair of engagement holes 15c, 15c that fit into 41a are provided. The flange 41a fitted in the engagement hole 15c is fixed by caulking.

  The carbon brush 16 has a three-dimensional block 16a and an engagement protrusion 16b that protrudes integrally on the back surface side and is fitted and latched in the latch hole Q of the brush holder portion 15a.

  As shown in FIGS. 6 and 7, the end lid 5 has a concave shape mainly having an inner space E. The end lid 5 has a washer-receiving portion M and a step difference in the axial depth direction from the bottom surface 5 c of the inner space E. 1A. Therefore, as shown in FIG. 1A, it has a protruding end portion 5b protruding with a smaller diameter than the end surface 5a. The inner space E is partitioned by a substantially rectangular wall surface, but at the center of the wall surface T of the wall portion 5d that forms the straight outline (one side) of the end lid 5, a pair of standing uprights rises from the bottom surface 5c. A spacer portion 5e for separating and arranging the brush assemblies 10, 10 in a symmetrical manner is integrally formed. The left and right shapes of the inner space E centered on the spacer 5e are formed symmetrically. Therefore, one configuration will be described below.

  The connector portion insertion groove K and the attachment portion insertion groove J are opened on the wall surface T of the wall portion 5d and the wall surface U orthogonal thereto, and a substantially triangular prism-shaped positioning protrusion 5f is integrally raised from the bottom surface 5c. doing. The attachment portion insertion groove J passes through the bottom surface 5c (see FIG. 2). The connector portion insertion groove K and the attachment portion insertion groove J are orthogonal to each other. The wall surface U and one non-perpendicular vertex side of the positioning projection 5f are integrally connected by a stupper portion 5g, and the stapper portion 5g has a projecting piece positioning slit 5h along a surface facing the wall surface U of the positioning projection 5f. The wall 5d has a terminal insertion hole 5i for inserting a plate-like male terminal. A brush spring insertion groove 5j is formed between the other non-perpendicular vertex side of the positioning protrusion 5f and the spacer part 5e, and a recess 5k is provided on the wall surface U at the intersection of the groove 5j and the attachment part insertion groove J. It has been. A pin insertion hole 5m for inserting a pin is formed on the bottom surface 5c between the metal housing portion N and the stapper portion 5g. The pin insertion hole 5m is used in a brush setting operation for bending the brush spring 15 outwardly and placing the brush 15 on the commutator 9 of the armature 4 when the end cover 5 is fitted to the motor case 1. Is.

  The brush assembly 10 is assembled into the end cover 5 by inserting the connector portion 30 and the attachment portion 20 into the connector portion insertion groove K and the attachment portion insertion groove J, and the leaf spring P of the attachment portion 20 is positioned on the positioning projection 5f side. As shown in FIG. 8 (A), the brush assembly 10 is prevented from coming loose without being loosely pressed. Since the free ends of the pair of leaf springs P are opposite to each other, they act reversely on the attachment portion insertion groove J, so that the retaining effect is strong.

  After the end cover 5 incorporating the pair of brush assemblies 10 and 10 shown in FIG. 8 (A) is fitted to the motor case 1 incorporating the armature 4, as shown in FIG. 8 (B) and FIG. The male male terminal 50 is inserted into the terminal insertion hole 5 i and connected to the connector portion 30. Note that L is a lead wire connected to the end of the plate-like male terminal 50 by soldering.

  As shown in FIG. 10 (A), when the plate-shaped male terminal 50 is inserted in sliding contact with the plate width surface of the receiving plate portion 31, two lines in the pair of left and right curling portions 32 and 32 are inserted at the beginning of the insertion. Since only the front end Z of the strip thick surfaces X and X rides relatively on the tip side (the rounded portion) of the plate surface of the plate-like male terminal 50, the entire shape of the pair of left and right curling portions 32 and 32 is elastic. It is slightly distorted and becomes a tilt posture. After that, when the insertion depth gradually increases, the length of the curling portions 32 and 32 that run up on the plate surface of the plate-shaped male terminal 50 of the two strip plate thick surfaces X and X is increased. At the same time as the posture of the portion 32 gradually returns, the elastic clamping force gradually increases, so that the elastic clamping force is maximized at the end of insertion. This maximum elastic clamping force is proportional to the dimension of the curling portion 32 in the width direction, and since the longest insertion depth direction is the width direction, the elastic coefficient of the curling portion 32 increases as the longest insertion depth increases. The clamping force can be remarkably increased. In addition, as shown in FIG. 10C, as the insertion becomes deeper, the contact area of the plate-like male terminal 50 that contacts the receiving plate portion 31 gradually increases, so that the contact area can be increased. In addition to this, the plate width surface of the receiving plate portion 31 is in surface contact with the plate surface of the inserted plate-shaped male terminal 50 with the maximum contact area, and the two strip plate thick edges X and X are The front end Z of the strip plate thick surfaces X and X in the pair of left and right curling portions exerts a reverse bending action on the plate surface against the extraction of the plate-like male terminal 50. Therefore, the punching strength of the plate-like male terminal 50 is greatly improved.

  If there is a sufficient gap between the stopper portion 5g and the curling portion 32, the inner end of the strip plate thick surface X may also have a reverse curl action. It is absorbed by the rounded portion on the side and does not perform its function. In addition, depending on the insertion of the plate-like male terminal 50, the tip may not hit the stopper portion 5g, so that the reverse folding action at the far end of the line plate thick surface X cannot be expected so much. Here, in order to reinforce the reverse bending action of the front end Z of the line plate thick surface X, a tapered cored bar is used in forming the curling portion 32, and the gap between the line plate thick surface X and the receiving plate portion 31 is used. Is formed so that the front end side is narrower than the back end side, and the front end Z is easily bitten. In addition, since the front end side of the plate-shaped male terminal 50 is a rounded portion, it is relatively easy to insert.

  Furthermore, as shown in FIG. 9, since the length direction of the receiving plate 31 of the connector part 30 is not in the motor axial direction but is orthogonal to this, the extension of the longest insertion depth dimension of the plate-like male terminal 50 The motor shaft length can be shortened by improving the punching resistance or suppressing the thickness of the end cover 5.

(A) is a perspective view which shows the motor with a small brush which concerns on the Example of this invention, (B) is a longitudinal cross-sectional view of the motor. It is an assembly perspective view of the motor. (A) is the perspective view which shows the brush assembly used for the motor, (B) is the perspective view which looked at the brush assembly from another viewpoint. It is an assembly perspective view of the brush assembly. It is the assembly perspective view which looked at the same brush assembly from another viewpoint. (A) is a perspective view showing an end cover used in the motor, (B) is a top view showing a part of the end cover, (C) is a front view of the end cover, and (D) is (C). It is sectional drawing which shows the state cut | disconnected along the dd 'line in the inside. It is a perspective view which shows the state which incorporates the brush assembly in the end cover. (A) is a front view of the end cover showing the state in which the brush assembly is incorporated in the end cover, and (B) is a view in which a plate-shaped male terminal is inserted into the female terminal fitting of the incorporated brush assembly. It is a front view of the end cover which shows the state which wore. (A) is a top view showing a state immediately before inserting the plate-shaped male terminal into the female terminal fitting, and (B) is a front sectional view showing the state immediately before. (A) is front sectional drawing which shows the insertion initial state of the same plate-shaped male terminal with respect to the same female terminal metal fitting, (B) is front sectional view which shows the middle state of insertion of the same male male terminal with respect to the same female terminal metal fitting. FIG. 4C is a front cross-sectional view showing a final insertion state of the plate-like male terminal with respect to the female terminal fitting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Motor case 1a ... End plate part 2 ... Permanent magnet 3 ... Motor shaft 4 ... Armature 4a ... Armature core 4b ... Winding coil 5 ... Resin end cover 5a ... End face 5b ... Projection end part 5c ... Bottom face 5d ... Wall Part 5e ... Spacer part 5f ... Positioning projection 5g ... Stupper part 5h ... Projection piece positioning slit 5i ... Terminal insertion hole 5j ... Brush spring insertion groove 5k ... Depression 5m ... Pin insertion holes 6, 7 ... Radial bearing 8 ... Commutator holder 9 ... Commutator 9a ... Riser 10 ... Brush assembly 12 ... Female terminal fitting 15 ... Brush spring 15a ... Brush holder part 15b ... Beam part 15c ... Engagement hole 16 ... Carbon brush 16a ... Solid block 16b ... Engagement protrusion 20 ... mounting part 21 ... central part 22 ... projecting piece 30 ... connector part 31 ... receiving plate part 31a ... narrow projecting piece 32 ... curling part 40 ... connecting piece part 41a ... flange 50 ... plate-like male terminal A ... Surface E ... Inner space J ... Mounting portion insertion groove K ... Connector portion insertion groove L ... Lead wire N ... Metal housing portion M ... Washer housing portion P ... Plate spring Q ... Hatch hole R ... Ring varistor S ... Step portion T, U ... Wall surface W ... Thrust washer X ... Line plate thick surface

Claims (4)

A receiving plate portion provided with a plate width surface for guiding the inserted male male terminal so as to be relatively slidable in the depth direction of the plate length, and the plate width surface integrally from the left and right sides of the receiving plate portion. Each having a pair of left and right curling portions that are bent in the opposite directions, and the thickness of the strip in the width direction of each curling portion is opposed to the plate width surface. Female terminal fittings characterized by 2. The female terminal fitting according to claim 1, wherein the female terminal fitting integrally includes a connector portion on one end side of the mounting portion and a connecting portion on the other end side of the mounting portion, and a brush spring is connected to the connecting portion. A brush assembly comprising a brush attached to the brush spring. A motor with a brush using a pair of brush assemblies as defined in claim 2, wherein the attachment portion is incorporated symmetrically so that the connector portion side is disposed outside in a groove on one inner wall surface side of the end lid. 4. The brush motor according to claim 3, wherein each of the attachment portions includes a leaf spring for elastically contacting the attachment portion with an inner surface of the groove.

Images