JP2007124844A - Electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the deterioration of a draining function in each selective mounting when making it possible to selectively mount a harness 18, which is mounted on a terminal 14 projecting from a cylindrical bottom portion 4a of an end bracket 4 of an electric motor 1, in a plurality of drawing directions in a locking state. <P>SOLUTION: A rib 4e of an octagonal shape, the lower side of which is cut out, is formed on the outside surface 4d of the cylindrical bottom portion of the end bracket 4. It is made possible to assemble a locking member 17 of an octagonal cylindrical shape to the rib 4e by selecting a direction a leading groove 17b faces. Also, drain grooves 17h, 17i are formed so that water can be drained in any direction selected. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention belongs to the technical field of electric motors such as employed as a drive source for electrical components mounted on a vehicle.

In general, this type of electric motor has a bottomed cylindrical yoke, a permanent magnet fixed to the inner peripheral surface of the yoke, an end bracket attached to the yoke opening side, and freely rotatable between the end bracket and the yoke bottom. It is configured using various members such as an armature provided, a commutator provided integrally with the armature, and a brush holder provided on an end bracket to hold a brush that is in sliding contact with the commutator. In some cases, a terminal for harness connection is formed so as to protrude from the end bracket to supply power to the brush (for example, Patent Document 1).
However, in such cases, when a harness (cable) is connected to the terminal, when the harness is simply bolted to the terminal, when the bolt is tightened, the harness rotates together with the bolt to the opposite pole. There is a risk of short circuiting.
Japanese Utility Model Publication No. 10-5

  Therefore, an attempt has been made to provide a harness detent on the terminal side to prevent the harness from rotating when the bolt is tightened. However, recently, due to the arrangement relationship with other members, etc., it is required to change the wiring direction of the harness depending on the vehicle type, etc. Therefore, in order to make the wiring direction of the harness different one by one, a plurality of detent members are attached separately. However, in this case, a plurality of anti-rotation members or the like corresponding to the wiring direction are required, so that not only the parts management becomes complicated, but also there is a possibility that a mounting difference occurs. Moreover, when such a rotation-preventing member is U-shaped in which the wiring direction of the harness is cut out, there is a problem that rainwater and washing water do not readily drain out, and these should be solved by the present invention. There are challenges.

The present invention has been created in view of the above-mentioned circumstances and has been created for the purpose of solving these problems. The invention of claim 1 is directed to projecting a power feeding terminal from an end bracket constituting an electric motor. In the electric motor in which the harness is assembled to the terminal in a non-rotating manner, a polygonal positioning rib is formed on the outer peripheral surface of the end bracket so as to surround the terminal protruding portion, and the harness is pulled out to the positioning rib. An electric motor characterized in that a polygonal cylinder-shaped detent member formed with a groove is configured to be aligned and assembled by selecting a polygonal position.
According to a second aspect of the present invention, in the electric motor according to the first aspect, a drain passage for discharging water that has entered the anti-rotation member is provided in each cylindrical peripheral portion that is located at the lower side by the selected position adjustment of the anti-rotation member. It is an electric motor characterized by being formed.
According to a third aspect of the present invention, in the electric motor of the second aspect, the drainage path is continuous with the first drainage groove formed on the inner peripheral surface of the cylindrical portion in the axial direction, and the first drainage groove. It is an electric motor characterized by being comprised with the 2nd water draining groove formed in the base end contact | abutted to an end bracket in a state.
According to a fourth aspect of the present invention, in the electric motor according to any one of the first to third aspects, the positioning rib has an open state in which a portion conceived to the lower side is notched and there is no rib. It is an electric motor.
According to a fifth aspect of the present invention, in the electric motor according to any one of the first to fourth aspects, the end bracket has a bottomed cylindrical shape, the terminal protrudes in the axial direction from the bottom surface of the end bracket, and the detent member Is an electric motor that is assembled to the outer surface of the bottom surface of the end bracket cylinder.

According to the invention of claim 1, it is possible to easily remove the harness from any selected polygonal position and eliminate interference with other members.
According to the invention of claim 2, the water that has entered the interior can be drained using the drainage channel at any selected drawing position, and protection from water can be achieved.
By setting it as invention of Claim 3, the drainage from the end bracket contact side of a rotation prevention member can be performed by the 1st, 2nd drainage groove, and the improvement of a drainage function can be aimed at.
According to the invention of claim 4, water drainage from here is ensured while the polygonal positioning rib is positioned at an arbitrary selected position.
By setting it as invention of Claim 5, drainage of water can be performed using the outer surface of an end bracket cylinder bottom face, and the draining function can be improved.

  Next, embodiments of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes an electric motor, and the electric motor 1 is employed as a power source for vehicle electrical components in the present embodiment, but has a bottomed cylindrical yoke 2 having an open end. A permanent magnet 3 fixed to the inner peripheral surface of the yoke 2, an end bracket 4 attached to the opening side of the yoke 2, an armature 5 rotatably provided between the end bracket 4 and the bottom of the yoke 2, and the armature 5 is configured using various members such as an insulative brush holder 8 attached to the end bracket 4 so as to hold the brushes 7 and 7a slidably in contact with the commutator 6 integrally provided in the end bracket 4. All of them are the same as before. In the present embodiment, the commutator 6 is of a disk type, and is configured such that the brushes 7 and 7a are in sliding contact with the disk surface on the axial side surface of the armature shaft 5a. The end bracket 4 is formed in a bottomed cylindrical shape by a conductive material.

  The electric motor 1 will be described as having four poles, but the present invention is not limited to this. For this reason, in this case, the brushes 7 and 7a are accommodated in the four holder portions 8a formed on the brush holder 8 so as to be movable in the axial direction, respectively, and are attached in a direction protruding from the holder portion 8a by the elastic machine 9. And is in sliding contact with the commutator 6. Of the brushes 7 and 7a, comrades 7 and 7, 7a and 7a of the same polarity are arranged around the standing pieces 11a and 12a in which the terminal members 11 and 12 for connection are erected through the pigtails 10 and 10a. It is connected to each end part in the direction. A through hole 11c is formed in the mounting piece 11b formed so as to face the bottom surface portion 4a of the end bracket 4 while being sandwiched between both pigtails 10 of one terminal member 11. Further, the brush holder 8 is formed with a through hole portion 8b projecting toward the mounting piece 11b so as to face the mounting piece 11b, and a screw is formed on the end bracket bottom surface portion 4a so as to project toward the mounting piece 11b. A provided mounting hole 4b is formed. When the brush holder 8 is assembled to the end bracket 4 with the through hole 8b passing through the mounting hole 4b, the mounting hole 4b is fitted into the through hole 8b with the tip thereof being flush. The brush holder 8 can be fixed to the end bracket 4 together with the terminal material 11 by screwing the screw 13 into the mounting hole 4b from the through hole 11c with the mounting piece 11b in contact with the tip. As a result, the electric motor 1 according to the present embodiment allows a current on one pole side to flow through the end bracket 4 and enables a body earth to be described later.

  Also, the other connecting terminal member 12 is formed with a mounting piece 12b formed so as to be opposed to the bottom surface portion 4a of the end bracket 4 while being sandwiched between the pigtails 10a, and the mounting piece 12b has a through hole. 12c is drilled. From the through hole 12c, the through hole 8c formed in the brush holder 8 and the through hole 4c formed in the bottom surface portion 4a of the end bracket 4 are penetrated from the bottom surface portion 4a of the end bracket 4 in the axially outward direction. The tip of an external connection terminal (corresponding to the terminal of the present invention) 14 protrudes toward the end. The terminal 14 is set so as to be loosely fitted to the through-hole 4c, that is, so as not to come into contact with the terminal 14, and an O-ring 15 is incorporated in the gap to maintain insulation. Further, the protruding position of the end bracket 4 of the terminal 14 is set in the present embodiment so as to be on the upper side of the bottom surface portion 4a when the electric motor 1 is assembled. And in this thing, the bracket 16 for attaching the electric motor 1 to the housing | casing side is formed in the lower part of the outer surface 4d of the end bracket bottom face part 4a so as to protrude in the axial direction with a width in the horizontal direction, It is set so that the electric motor 1 can be mounted in a state where the body is grounded by tightening the bolts to the housing side using bolt holes 16a formed at both ends of the bracket 16 in the horizontal direction.

  Further, the end bracket bottom surface 4d has an octagonal shape (the present invention is not limited to the octagonal shape in the present embodiment) with the through hole 4c surrounding the through hole 4c with a gap. A positioning rib 4e, which will be described later, having a hexagonal shape, or a polygonal shape such as a hexagonal shape or a decagonal shape, is naturally formed. The positioning rib 4e has an opening (opening) state in which a portion corresponding to the lower side is notched and is formed in the notch 4f and has no side, but the lower side exists. In this case, the lower side is set to face in the horizontal direction.

  Reference numeral 17 denotes a rotation prevention member for preventing rotation of the harness 18 attached to the distal end portion of the terminal 14, which is formed of an insulating material. The rotation prevention member 17 corresponds to the positioning rib 4e. It has an octagonal cylindrical shape, and one of the cylinder peripheral portions 17a has a drawer groove 17b for pulling out the harness 18 in a non-rotating manner, with the base end side closed as a groove bottom and the distal end side opened a groove. Is formed. A hook-like portion 17c is formed in a stepped shape at the base end portion of the rotation preventing member 17 toward the inner diameter side of the cylinder, and the terminal 14 is loosely fitted on the inner peripheral side of the hook-like portion 17c with a gap. A through-hole 17d for penetrating in a shape is formed. Reference numeral 19 denotes a spacer formed of an insulating material. The spacer 19 is assembled to the terminal 14 penetrating the through hole 17d. The spacer 19 includes the terminal 14 and the through hole 17d. Between the small diameter portion 19a and the large diameter portion 19b engaged with the stepped surface of the flange portion 17c, and the washer 20 is assembled on the outer end surface of the large diameter portion 19b. Then, the harness 18 is assembled on the outer end face side of the washer 20 in a state of passing through the terminal 14 in a state of being fitted into the lead-out groove 17b, and tightened with a nut 21 with a flange from the outside thereof, whereby the harness 18 It can be installed.

In the present embodiment, the direction in which the harness 18 is pulled out is set in five directions toward the upper outer side opposite to the lower side on which the bracket 16 is formed (the number of directions can be arbitrarily set if necessary) The anti-rotation member 17 can be assembled to the anti-rotation member 17 in the state changed to (No), and the following specific configuration will be described.
In other words, the rotation preventing member 17 includes a cylindrical peripheral portion 17a in which the lead-out groove 17b is formed and two cylindrical peripheral portions 17e sandwiching the cylindrical peripheral portion 17a. It is set so as to be substantially flush with each other, and the portion from which the harness 18 is pulled out is thickened and reinforced. A fitting portion 17f that is notched in a stepped shape is formed so as to be fitted to 4e, and the fitting portion 17f is fitted into the rib 4e in a state where the thickness equivalent portion abuts the outer end surface of the rib 4e in an overhang shape. It is configured to be assembled.

On the other hand, the remaining five cylinder peripheral portions 17g are set so that the outer peripheral surface is substantially flush with the inner peripheral surface of the rib 4e, and are configured to be fitted and assembled into the rib 4e. Further, a first water drain groove 17h is formed in the inner peripheral surface of the five cylinder peripheral portion 17g in the axial direction, and is further connected to the base end of the first water drain groove 17h to A second water draining groove 17i that reaches the outer peripheral surface in a state in which the portion 17c is cut out is formed.
When the anti-rotation member 17 is selected and incorporated so that any one of the water draining grooves 17h faces the rib notch 4f, the anti-rotation member 17 has one posture in which the harness pull-out groove 17b faces upward. (See FIG. 6 (A)), five postures (see FIG. 6 (C)) and two postures (see FIG. 6 (B)) facing left and right diagonally upward (see FIG. 6 (B)). 6 (B) and (C), the direction to the right is omitted) so that the harness drawer positioned in these five directions can be set with the harness 18 being prevented from rotating. It has become. And when selectively assembled in this way, the first and second drain grooves 17h, 17i formed in one cylindrical peripheral portion 17g of the five cylindrical peripheral portions 17g located on the lower side are provided inside the cylinder. It is configured to allow positive drainage of infiltrated water.

  In the embodiment of the present invention configured as described above, when connecting the harness 18 to the terminal 4 projecting from the end bracket 4, the rotation preventing member 17 is oriented in various directions so that the lead-out groove 17 b faces the direction in which the harness 18 is pulled out. As shown in FIG. 6, the spacer 17 and the washer 20 are assembled into the terminal 14, the harness 18 is assembled, and then tightened with the nut 21. By doing so, the harness 18 is prevented from rotating, and the assembly is performed in a state in which the drawing direction is arbitrarily selected from the polygonal position and confirmed, and the harness 18 rotates together. Can be avoided. As a result, in the present embodiment, it is possible to avoid such a problem that the bracket 16 is in contact with the opposite polarity to the harness 18.

  Moreover, in this case, since the first and second drain grooves 17h and 17i are formed on the inner peripheral surface of the rotation preventing member 17, the drainage is positively performed. 17h and 17i are formed in five cylindrical peripheral portions 17g that face downward when the electric motor 1 is assembled on the housing side, so that it is possible to reliably drain water regardless of which pulling direction is selected and assembled. Become.

  In addition, since the second water draining groove 17i is formed on the side in contact with the outer surface 4d of the bottom surface of the end bracket, there is an advantage that water can be drained more positively using the outer surface 4d. In addition, in this case, the water discharged from the second drain groove 17i of the rotation prevention member 17 flows down from the notch portion 4f formed on the lower side of the rib 4e, so that the rotation prevention member 17 is prevented from rotating. Even if it protrudes and forms 4e, a water draining function is not impaired at all.

  Of course, the present invention is not limited to the above-described embodiment, and the harness pull-out position may be the peripheral surface portion instead of the bottom surface portion of the end bracket. Needless to say, the present invention can be applied not to the structure of the drawer but also to the structure of the bipolar drawer without using the body earth.

It is a partially cutaway side view of an electric motor. It is an expanded sectional side view of an end bracket part. It is a rear view of an end bracket part. The end bracket is shown, in which (A) is a front view, (B) is a front view showing a state in which a detent member is attached, (C) is a side view of the bracket portion, and (D) is an enlarged view of the rib portion. It is sectional drawing. The anti-rotation member is shown, wherein (A) is a front view, (B) is a plan view, (C) is a rear view, (D) is a side view, (E) is a bottom view, and (F) is a cross section. FIG. (A) (B) (C) is principal part explanatory drawing which shows the state attached by changing the attachment direction of a rotation prevention member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric motor 4 End bracket 4a Bottom face part 4e Rib 14 Terminal 17 Anti-rotation member 17b Draw-out groove 17h First drainage groove 17i Second drainage groove 18 Harness

Claims (5)

  In an electric motor in which a power supply terminal protrudes from an end bracket constituting the electric motor and a harness is assembled to the terminal in a non-rotating manner, the outer peripheral surface of the end bracket is surrounded by the terminal protruding portion. An electric motor characterized in that a positioning rib having a shape is formed, and a polygonal cylindrical detent member in which a harness pull-out groove is formed is positioned and assembled to the positioning rib by selecting a polygonal position. motor.   2. The electric motor according to claim 1, wherein a drainage passage for discharging water that has entered the anti-rotation member is formed in each cylindrical peripheral portion that is located at a lower side by the selected position adjustment of the anti-rotation member. Electric motor.   3. The electric motor according to claim 2, wherein the drainage path abuts on the end bracket in a state of being continuous with the first drainage groove formed on the inner peripheral surface of the cylindrical portion in the axial direction. An electric motor comprising a second drainage groove formed at a proximal end.   4. The electric motor according to claim 1, wherein a portion of the positioning rib that corresponds to the lower side is notched so that the rib is not opened. 5.   5. The electric motor according to claim 1, wherein the end bracket has a bottomed cylindrical shape, the terminal protrudes in an axial direction from the bottom surface of the end bracket, and the anti-rotation member is provided on the bottom surface of the end bracket tube. An electric motor characterized by being assembled on an outer surface.

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