JP2006217739A - Ac generator for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an AC generator for a vehicle that can be improved in assembling performance to an output terminal of a bush. <P>SOLUTION: The problem can be solved such that a holding member 14 having an electrical insulation property is integrally formed on the external peripheral surface of the bush 12 clamped by a clamping force of a nut 11 that is transmitted via a vehicle-side output terminal 13a; an engagement (flange 14b and penetration hole 14c) with a protrusion 3a of an end bracket 3 is formed at the holding member 14; and the bush 12 is assembled to an generator-side output terminal 10, by making the engagement part of the holding member 14 engage with the protrusion 3a of the end bracket 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicular AC generator that is mounted on a vehicle such as an automobile and generates electric power supplied to an on-vehicle electric load.

  The vehicle AC generator is provided with an output terminal for taking out the generated electric power to the outside. Conventionally, for example, those described in Patent Documents 1 and 2 are known as the structure of this output terminal.

  In Patent Document 1, a male screw portion provided on the opposite side of the output terminal bolt from the take-out side is fastened and fixed to a one-side fastening nut that is fastened and fixed to the through hole of the positive-side cooling fin of the rectifier. It is described that a nut is fastened and fixed via two insulating bushes and a rear frame on the take-out side. Conventionally, many resin bushes are used as the insulating bush.

  Patent Document 2 describes that a female screw portion of a spacer is screwed to a male screw portion of an output terminal, and a front end surface of the spacer is used as a seating surface of the vehicle-side output terminal. And in what was described in patent document 2, the loose fitting part provided in the both sides of the internal thread part of a spacer was elastically deformed by the fastening of the nut which clamps and fixes a vehicle side output terminal, and the drag by this elastic deformation is carried out. The output terminal, the spacer, and the vehicle-side output terminal are coupled to each other, and the output terminal, the spacer, and the positive-side cooling fin of the rectifier are coupled to each other.

JP-A-9-107654 JP 2001-8398 A

  When the resin insulation bush is used for the output terminal fastening structure of the vehicle alternator as in the former background art mentioned above, the nut is tightened by deformation due to temperature change of the resin, deformation due to aging, vibration, etc. It is necessary to consider the decline in power. On the other hand, the configuration of the latter background art described above is advantageous over the former background art described above because it can suppress a decrease in the tightening force of the nut.

  However, in the latter background art described above, the screw portion of the spacer has to be screwed to the screw portion of the output terminal, and accordingly, the assembling work is time-consuming.

  The present invention provides an automotive alternator that can improve the ease of assembly of a bush to an output terminal.

  In the present invention, a holding member having electrical insulation is integrally formed on a bush that is tightened by a tightening force of a nut transmitted through a vehicle-side output terminal, and an engaging portion with a housing is formed on the holding member. The bushing is assembled to the generator-side output terminal by engaging the engaging portion of the holding member with the housing.

  According to the present invention, the bush can be easily assembled to the output terminal simply by engaging the engaging portion of the holding member with the housing. Therefore, according to this invention, the assembly | attachment property to the output terminal of a bush can be improved.

  According to the present invention, the assembling property of the bush to the output terminal can be improved, so that the assembling workability of the output terminal to the generator body can be improved. Moreover, according to the present invention, loosening of the nut can be suppressed with a simple structure of elastic deformation of the bush by tightening the nut. Therefore, according to the present invention, it is possible to provide an automotive alternator that is inexpensive and highly reliable.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the following embodiments, the present invention will be described by taking as an example the case where the present invention is applied to an output terminal of an automotive and water-cooled AC generator. However, the output terminal of an automotive and water-cooled DC generator, or an automobile. The present invention may be applied to the output terminal of an air-cooled AC or DC generator. Further, the present invention may be applied to a water-cooled or air-cooled AC or DC generator configured to fasten an external output terminal with a nut to an output terminal of a generator other than an automobile. Furthermore, the present invention may be applied to a portion other than the output terminal of the generator, which is a portion where two terminals are fixed by screw fastening.

  In the following description, unless otherwise specified, the axial direction refers to the direction in which the rotating shaft of the vehicle alternator extends. The radial direction refers to a direction extending radially perpendicular to the rotational axis of the vehicle alternator. The circumferential direction refers to the direction of concentric rotation with respect to the rotating shaft of the vehicle alternator.

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

  First, the overall configuration of the vehicle alternator of this embodiment will be described with reference to FIG.

  FIG. 2 shows the overall configuration of the vehicle alternator of this embodiment.

  The vehicle alternator according to the present embodiment receives a rotational driving force of an internal combustion engine (engine) (hereinafter simply referred to as “engine”) of an automobile while receiving a field current, and the rotor rotates. To generate AC power in the stator, and the generated AC power is rectified by a rectifier to obtain DC power (power for driving an electrical load mounted on a vehicle and power for charging a storage battery), an alternator Or it may be called a charging generator for vehicles. The vehicle AC generator of this embodiment is a water-cooled (liquid-cooled) synchronous generator, and circulates cooling water (liquid refrigerant) in the machine to cool a heating element such as a stator and a rectifier. Yes. The cooling water (liquid refrigerant) cools an automobile engine, and an antifreeze liquid cooled by a radiator (cooler) attached to the engine is branched and used.

  A vehicle alternator (hereinafter simply referred to as “generator”) 100 includes a housing (housing), and the components described below are accommodated in the housing. The housing of the generator 100 according to the present embodiment includes a frame 1, end brackets 2 and 3 provided at both axial ends of the frame 1, and a rear cover 9 provided on the opposite side of the end bracket 3 from the frame 1 side. It is constituted by.

  The frame 1 is a container-like container whose one end in the axial direction is open (open), and has a substantially cylindrical peripheral wall 1a and a side wall 1b that closes the end of the peripheral wall 1a opposite to the open (open) side. It is constituted by. Inside the peripheral wall 1a, a cooling medium passage 1c having an opening (opening) on the side wall 1b side is formed. The cooling medium passage 1c is a belt-like shape formed by dividing an annular space continuous in the axial direction and the circumferential direction of the peripheral wall 1a in the circumferential direction by one partition member (not shown) extending continuously in the axial direction. (Axial cross section is C-shaped). A cooling medium supply end 1d is formed at one end in the circumferential direction of the cooling medium passage 1c, and a cooling medium discharge end 1e is formed at the other end in the circumferential direction. A part of the outer peripheral side of the peripheral wall 1a is provided with an attachment portion 1f for attaching the generator 100 to the side of the engine casing and fixing the generator 100 to the side of the engine casing.

  The end bracket 2 is an annular member, and closes an opening (opening) portion formed at one end portion in the axial direction of the frame 1 (the axial end portion opposite to the side wall 1b side of the peripheral wall 1a). Further, the frame 1 is fixed to one end portion in the axial direction. A bearing 4 is held on the inner peripheral side of the end bracket 2. A part of the outer peripheral side of the end bracket 2 is provided with an attachment portion 2a for attaching the generator 100 to the side of the engine casing and fixing the generator 100 to the side of the engine casing. .

  The end bracket 3 is an annular member, and closes the opening end of the cooling medium passage 1c formed at the other axial end of the frame 1 (axial end on the side wall 1b side of the peripheral wall 1a). The frame 1 is fixed to the other end portion in the axial direction. Between the opposing surfaces of the side wall 1b and the end bracket 3, a silicon resin (or silicon resin) having a thermal conductivity higher than that of air is applied. A cooling medium supply port 3a is formed on the surface of the end bracket 3 facing the cooling medium supply end 1d of the cooling medium passage 1c, and a cooling medium discharge port 3b is formed on the surface of the end bracket 3 facing the cooling medium discharge end 1e. Each is formed. The cooling medium supply port 3a and the cooling medium discharge port 3b are axial through holes and communicate with corresponding ends of the cooling medium supply end 1d and the cooling medium discharge end 1e.

  The cooling medium supply port 3a is connected to the upstream side of the cooling system of the automobile engine (portion through which cooling water flows before cooling the engine). Thereby, a part of the cooling water for cooling the engine is branched and supplied to the generator, and circulates through the cooling medium passage 1c to cool the generator. The cooling medium discharge port 3b is connected to the downstream side of the cooling system of the automobile engine (the part through which the cooling water that has cooled the engine flows). As a result, the cooling water discharged from the generator after cooling the generator merges with the cooling water that has cooled the engine, and is cooled by the radiator attached to the engine.

  An annular groove 1g is formed on the facing surface of the peripheral wall 1a facing the end bracket 3 along the outer peripheral edge and the inner peripheral edge of the opening end of the cooling medium passage 1c. An O-ring 1h is inserted into the annular groove 1g. The O-ring 1h is a rubber sealing member (or packing) having elasticity, and hermetically seals the space between the facing surface of the peripheral wall 1a facing the end bracket 3 and the end bracket 3. Thereby, in the present embodiment, leakage of the cooling medium passage 1c is prevented.

  The side wall 1b is annular. The inner peripheral side of the side wall 1b protrudes in the axial direction toward the end bracket 3 side. Thus, an annular holding portion is formed on the inner peripheral side of the side wall 1b. On the inner peripheral side of the end bracket 3, a holding portion for the side wall 1b is disposed. A bearing 5 is held by the holding portion of the side wall 1b.

  A stator 6 is fixed to the inner peripheral side of the peripheral wall 1a. The stator 6 includes a stator core 6a and a stator coil 6b. The stator core 6a is formed of a cylindrical magnetic member. A plurality of slots (not shown) are formed in the inner peripheral portion of the stator core 6a. The stator coil 6b is configured by electrically connecting u-phase, v-phase, and w-phase coils by star connection or delta connection. Each phase coil is configured by electrically connecting the same-phase coils of a plurality of coils inserted into the slots of the stator core 6a.

  The entire stator 6 is fixed to the inner peripheral surface of the frame 1 and molded with an insulating resin having high thermal conductivity. As a result, the insulating resin having high thermal conductivity is filled in the gap between the stator 6 and the inner peripheral surface of the frame 1, and the stator 6 and the frame 1 are in thermal contact with each other by the insulating resin. The heat generated by the child 6 is transferred not only to the fixing portion between the stator core 6a and the frame 1, but also to the frame 1 by an insulating resin having high thermal conductivity. The heat generated by the stator 6 that is transferred to the frame 1 is cooled by the cooling medium flowing through the cooling medium passage 1c.

  A rotor 7 is rotatably provided on the inner peripheral side of the stator 6 through a gap. The rotor 7 includes a pole core (or rotor core) 7a. The pole core 7a has a pair of claw-shaped cores 7N and 7S (N-pole and S-pole pole cores) that have a plurality of claw portions 7c having a substantially triangular or trapezoidal outer peripheral surface in the circumferential direction. The claw portions of one core and the claw portions of the other core are fixed on the shaft 7b (or a rotation shaft) so that they are alternately arranged in the circumferential direction (rotation direction of the rotor). The stator core 6a is disposed to face the inner peripheral side of the stator core 6a via a gap. The shaft 7b extends in the axial direction, and one side (end bracket 2 side) is rotatably supported by the bearing 4 and the other side (end bracket 3 side) is rotatably supported by the bearing 5.

  A permanent magnet 7d made of a rare earth material such as cobalt, neodymium, or boron is fixed between the claw portion 7c of the claw-shaped core 7N and the claw portion 7c of the claw-shaped core 7S facing each other in the circumferential direction. Yes. The permanent magnet 7d is fixed between the claw portions 7c while being held by a holding member (not shown). A field coil 7e (or a rotor winding) wound around a bobbin is provided on the core portion facing the inner peripheral side of the claw portion 7c of the claw-shaped cores 7N and 7S (or a field coil is provided in the portion). The magnetic coil 7e may be wound directly). The field coil 7e is insulated.

  A cooling fan 7k is attached to the side surface of the pole core 7a (the side surface on the bearing 5 side and the side surface of the claw-shaped core 7S). The cooling fan 7k rotates with the rotation of the pole core 7a, introduces cooling air into the housing from the ventilation holes 1i provided in the side wall 1b, circulates in the machine, and discharges it outside through the ventilation holes 2b provided in the end bracket 2. To do. The cooling by the cooling fan 7k is secondary, and the main cooling is cooling by the cooling medium flowing through the cooling medium passage 1c.

  One end of the shaft 7b in the axial direction (end on the end bracket 2 side) extends to the outside of the bearing 4 in the axial direction (direction away from the end bracket 2). A pulley 7f (referred to as a belt disk) is fixed to one end of the shaft 7b in the axial direction. The pulley 7f is mechanically coupled to a pulley provided on a crankshaft of an automobile engine via a chain or belt that is a driving force transmission means. Thereby, the rotational driving force of the engine is transmitted to the generator 100.

  The other end portion in the axial direction of the shaft 7b (end portion on the end bracket 3 side) extends to the outside in the axial direction (in the direction away from the end bracket 3) from the bearing 5. A slip ring 7g (current collecting ring) is fixed to the other axial end of the shaft 7b located on the outer side in the axial direction than the bearing 5. The slip ring 7g is a conductive annular member, and is electrically connected via a field coil 7e lead wire (not shown). A brush 7h is in sliding contact with the slip ring 7g. The brush 7h exchanges electric power (field current) with the rotating slip ring 7g, and is held by a brush holder 7i fixed to the surface of the end bracket 3 opposite to the frame 1 side. ing. A spring 7j is provided in the brush holder 7i. The spring 7j presses the brush 7h so that the brush 7h is in sliding contact with the slip ring 7g.

  A rectifier 8 and a voltage regulator (not shown) are fixed to the surface of the end bracket 3 opposite to the claim 1 side. The rectifier 8 performs full-wave rectification on the three-phase alternating current that is the power generation output of the stator coil 6b to obtain a direct current output. The voltage regulator (not shown) controls the field current flowing through the field coil 7e via the brush 7h and adjusts the three-phase AC output from the stator coil 6b.

  A rear cover 9 that covers the rectifier 8, the voltage regulator, and the brush holder 7i is provided on the side opposite to the frame 1 side of the end bracket 3 (the side on which the rectifier 8, the voltage regulator, and the brush holder 7i are disposed). . The rear cover 9 is a member made of aluminum, and is a protective member that protects the rectifier 8, the voltage regulator, and the brush holder 7i so that foreign matter does not enter from the outside and the equipment is damaged.

  A generator output terminal 10 is electrically connected to the rectifier 8. The generator-side output terminal 10 extends in the axial direction from the end bracket 3 side toward the rear cover 9 side, protrudes outside from the side wall of the rear cover 9, and is exposed to the outside of the rear cover 9. A vehicle-side output terminal (not shown in FIG. 2) is electrically connected to the generator-side output terminal 10. The vehicle-side output terminal is provided at the tip (the tip of the generator 100 side) of a power cable (not shown in FIG. 2) that supplies the DC power output from the rectifier 8 to the battery and the electrical load. It is a connection terminal with the machine side output terminal 10.

  Next, the assembly structure of the generator output terminal of the present embodiment will be described with reference to FIG.

  FIG. 1 shows an enlarged view of the configuration near the generator output terminal of this embodiment.

  As shown in FIG. 1, the generator-side output terminal 10 is a bolt-shaped member formed of a conductive member, and has an axial direction (direction in which the central axis of the generator-side output terminal 10 extends) at one end ( Formed between the head 10a formed at the rectifier 8 side end), the bolt shaft 10c formed at the other side end (rear cover 9 side end), and the head 10a and the bolt shaft 10c. The embedded portion 10b is formed.

  The head portion 10a constitutes a collar portion, and is in contact with the positive-side heat radiating plate 8b from the end bracket 3 side of the rectifier 8. The outer diameter of the head 10 a is larger than the inner diameter of the through hole 8 a formed in the rectifier 8. The embedded portion 10b is a short cylindrical portion, and is press-fitted into a through hole 8a formed in the rectifier 8. The outer diameter of the embedded part 10b is smaller than the outer diameter of the head part 10a. The bolt shaft portion 10c is a rod-like portion, and is connected (fixed) to a vehicle-side output terminal 13a provided at the tip of the power cable 13 (or a harness). A screw portion 10d (male screw) is formed on the outer peripheral surface of the bolt shaft portion 10c. The outer diameter of the bolt shaft portion 10c is smaller than the outer diameter of the embedded portion 10a.

  A nut 11 is screwed to the tip of the bolt shaft portion 10c. The nut 11 is a member for fixing the vehicle-side output terminal 13a to the generator-side output terminal 10 (bolt shaft portion 10c) by self-tightening.

  A bush 12 is disposed on the outer peripheral side of the embedded portion 10b and the bolt shaft portion 10c. The bush 12 is a metal cylindrical member having a mechanical strength comparable to that of the generator-side output terminal 10, and faces the outer peripheral sides of the embedded portion 10b and the bolt shaft portion 10c via a gap. The inner diameter of the bush 12 is larger than the outer diameters of the embedded portion 10b and the bolt shaft portion 10c. One end surface in the axial direction of the bush 12 (end surface on the head 10a side) is in contact with the positive-side heat radiating plate 8b. The other end surface in the axial direction of the bush 12 (the end surface on the bolt shaft portion 10c side) is in contact with the vehicle-side output terminal 13a. The outer diameter of the bush 12 is smaller than the outer diameter of the head 10a (the outer diameter of the head 10a is larger) or equivalent to it.

  The vehicle-side output terminal 13a is formed of an annular flat plate-like conductive member. The power cable 13 extends radially outward from the generator-side output terminal 10 (in a direction away from the generator-side output terminal 10). A vehicle-mounted electric load such as a battery and a vehicle-mounted auxiliary machine is electrically connected to the power cable 13.

  The rear end of the bolt shaft portion 10c on the rear cover 9 side passes through the bush 12 and protrudes outward in the axial direction from the other end surface in the axial direction of the bush 12 (extends in a direction away from the positive-side heat radiation plate 8b of the rectifier 8). The bush 12 is exposed to the outside of the rear cover 9 from the other axial end of the bush 12. The vehicle-side output terminal 13a is mounted on the bolt shaft portion 10c in a state of being in contact with the other end surface in the axial direction of the bush 12, and is tightened by a nut 11 screwed to the rear cover 9-side end of the bolt shaft portion 10c. At this time, the end surface on the other side in the axial direction of the bush 12 becomes a seating surface of the nut 11.

  By tightening the nut 11 to the bolt shaft portion 10c, an axial force due to the tightening of the nut 11 acts between the nut 11 and the head portion 10a. Here, the axial force is a force acting in the axial direction, the pressing force of the nut 11 acting from the rear cover 9 side to the end bracket 3 side, and the head 10a acting from the end bracket 3 side to the rear cover 9 side. It consists of a pressing force.

  From the above, the vehicle-side output terminal 13a is pressed against the other end surface in the axial direction of the bush 12 from the axial direction (from the rear cover 9 side to the end bracket 3 side) by the axial force generated by tightening the nut 11, and the generator-side output The bolt 10 is fixed to the rear cover 9 side tip of the bolt shaft portion 10c while being electrically connected to the terminal 10.

  The bush 12 receives an axial force generated by tightening the nut 11 via the vehicle-side output terminal 13a. Thereby, the bush 12 is elastically deformed in the axial direction and contracts. Thus, the bush 11 is elastically deformed and contracted in the axial direction, so that the nut 11 receives the elastic force of the bush 12 (an axial force, an axial reaction force with respect to the axial force due to the tightening of the nut 11). Axial forces in both axial directions also act between the positive-side heat radiating plate 8b of the rectifier 8 and the one end face in the axial direction of the bush 12 based on the principle of action and reaction. The rotation of the nut 11 is restricted by the elastic force of the bush 12. As a result, the nut 11 is difficult to loosen even when an external force (for example, vibration from an automobile) is applied.

  Therefore, according to this embodiment, the nut 11 can be prevented from loosening, and the electrical connection between the generator-side output terminal 10 and the vehicle-side output terminal 13a can be maintained for many years. Connection reliability can be improved.

  A holding member 14 is integrally formed on the outer peripheral side of the bush 12. The holding member 14 is for holding the bush 12 in a predetermined position with respect to the generator-side output terminal 10, and is made of a resin having electrical insulation, and a coupling portion coupled to the bush 12 14a (which is cylindrical and may be referred to as a cylinder portion) and an annular flange portion 14b protruding radially from the outer peripheral surface of the coupling portion 14a so as to go around the outer circumferential surface of the coupling portion 14a. It is configured. In the present embodiment, the annular portion is described as the flange portion 14b. However, the flange portion 14b may partially protrude from the outer peripheral surface of the coupling portion 14a, for example, may protrude radially from two locations at intervals of 180 °.

  The flange portion 14 b includes a flange surface that faces the surface of the end bracket 3 on the rear cover 9 side, and a flange surface that faces the surface of the rear cover 9 on the end bracket 3 side. Even when the flange portion 14b has a flange structure that partially protrudes from the outer peripheral surface of the coupling portion 14a, two flange surfaces are provided as described above. In the flange portion 14b, two through holes 14c penetrating from one flange surface toward the other flange surface are formed at intervals of 180 ° in the circumferential direction. When the flange portion 14b has a structure that partially protrudes from the outer peripheral surface of the coupling portion 14a, for example, protrudes radially from two locations at intervals of 180 °, there is one through hole 14c at the center of each flange. It is formed.

  The flange portion 14b and the through hole 14c constitute an engaging portion with an end bracket 3 described later.

  The coupling portion 14 a extends in the axial direction along the outer peripheral surface of the bush 12, and the rear cover 9 side tip protrudes outside from the side wall of the rear cover 9 and is exposed to the outside. A part of the front end of the coupling portion 14a on the rear cover 9 side further extends in the axial direction. As a result, a portion of the front end of the coupling portion 14a on the rear cover 9 side has a fence 14d (or extension) for surrounding a portion around the connection portion (or fixed portion) between the generator-side output terminal 10 and the vehicle-side output terminal 13a. Is called out part).

  In the present embodiment, the fence 14d is formed to surround a part of the periphery of the connecting portion (or fixed portion) between the generator-side output terminal 10 and the vehicle-side output terminal 13a, thereby restricting the movement of the vehicle-side output terminal 13a. In addition, an electrical short circuit due to contact between the rear cover 9 and the vehicle-side output terminal 13a is prevented.

  A protrusion (convex portion) 3c is integrally formed at a portion of the end bracket 3 facing the through hole 14c. The protrusion 3c has a round bar shape, stands up (projects) vertically toward the rear cover 9 from the rear cover 9 side surface of the end bracket 3, and engages with the through hole 14c by being inserted into the through hole 14c. ing. Thereby, the rotation of the holding member 14 and the movement of the holding member 14 in the radial direction and the circumferential direction are restricted.

  A protrusion (convex portion) 9a is integrally formed at a portion of the rear cover 9 facing the through hole 14c. The protrusion 9a has a columnar shape having a diameter larger than that of the protrusion 3c and a short length in the axial direction, and rises (projects) vertically from the end bracket 3 side surface of the rear cover 9 toward the end bracket 3 side. The rear cover 9 side opening of the through hole 14c is disposed so as to be close to the through hole 14c and to face the through hole 14c. Thereby, the movement of the holding member 14 in the axial direction is restricted.

  The through hole 14c and the protrusions 3c, 9a are arranged on the same axis. The outer diameter (axial section) of the protrusion 9a is larger than the inner diameter (opening section) of the through hole 14c and the outer diameter (axial section) of the protrusion 3c. In this embodiment, the case where the projection 9a for restricting the movement of the holding member 14 in the axial direction is provided on the rear cover 9 is described, but it may be provided on the flange portion 14b.

  As described above, in this embodiment, the rotation of the holding member 14, the movement of the holding member 14 in the radial direction and the circumferential direction, and the movement of the holding member 14 in the axial direction can be restricted. The rotation of the bush 12, the radial and circumferential movements of the bush 12, and the axial movement of the bush 12 can be restricted. Therefore, in this embodiment, the bush 12 can be held at a predetermined position with respect to the generator-side output terminal 10.

  The assembly of the bush 12 to the generator-side output terminal 10 requires only the work of assembling the holding member 14 to the end bracket 3 by inserting the projection 3c of the end bracket 3 into the through hole 14c of the flange portion 14b. It can be easily performed without the work of tightening and assembly of a plurality of parts. Thereby, according to the present Example, the assembly | attachment property to the generator side output terminal 10 of the bush 12 can be improved. Therefore, according to the present embodiment, it is possible to improve the workability of assembling the generator-side output terminal 10 to the generator 100, and to reduce the manufacturing cost of the generator 100.

  In addition, according to the present embodiment, when the bush 12 is assembled to the generator-side output terminal 10, it can be easily performed without the work of screw tightening and assembly of a plurality of parts. Defects can be prevented. Therefore, according to the present embodiment, the reliability of the generator 100 can be improved.

  A second embodiment of the present invention will be described with reference to FIG.

  FIG. 3 shows an enlarged view of the configuration near the generator output terminal of the generator of this embodiment.

  This embodiment is an improved example of the first embodiment, and is configured to prevent foreign matter from entering from the opening of the rear cover 9.

  In addition, the same code | symbol as 1st Example is attached | subjected to the component similar to 1st Example, and the description is abbreviate | omitted.

  Unlike the first embodiment, the rear cover 9 is made of resin. Unlike the first embodiment, the fence 9b surrounding a part of the connecting portion (fixing portion) between the bolt shaft portion 10c of the generator side output terminal 10 and the vehicle side output terminal 13a is formed integrally with the rear cover 9. ing. For this reason, the coupling portion 14a of the holding member 14 has a shorter axial length than that of the first embodiment. Thereby, the rear cover 9 side tip of the coupling portion 14a is positioned on the inner side in the axial direction than the rear cover 9 (the position is close to the end bracket 3).

  A groove (depression or recess) 14e is formed at the end of the coupling portion 14a on the rear cover 9 side. The groove portion 14e is an annular recess formed on the opposite side of the rear cover 9 side end of the coupling portion 14a so as to be recessed in the axial direction from the rear cover 9 side toward the end bracket 3 side. A protrusion (convex portion) 9c is formed integrally with the rear cover 9 facing the groove 14e. The protrusion 9c engages with the groove 14e and is formed in an annular shape along the groove 14e. When the rear cover 9 is assembled to the end bracket 3, the protrusion 9c is engaged with the groove 14e. Thereby, a labyrinth 15 is formed between the coupling portion 14a and the rear cover 9.

  Thus, in this embodiment, the labyrinth 15 is formed between the coupling portion 14a and the rear cover 9. Thereby, according to the present embodiment, it is possible to prevent foreign matter from entering the rear cover 9 from the opening of the rear cover 9.

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

  FIG. 4 shows an enlarged view of the configuration near the generator output terminal of the generator of this embodiment. FIG. 5 shows the overall configuration of the generator of this embodiment.

  Components similar to those in the first and second embodiments are denoted by the same reference numerals as those in the first and second embodiments, and description thereof is omitted.

  In the first and second embodiments, the generator-side output terminal protrudes outward in the axial direction from the side wall of the rear cover 9 and is exposed to the outside of the rear cover 9. In the present embodiment, the generator-side output terminal protrudes radially outward from the peripheral wall of the rear cover 9 and is exposed to the outside of the rear cover 9. For this reason, in this embodiment, the generator-side output terminal is composed of the first generator-side output terminal 16 and the second generator-side output terminal 19.

  The first generator output terminal 16 is a bolt-like terminal as in the first and second embodiments, and is composed of a head portion 16a, an embedded portion 16b, and a bolt shaft portion 16c. Similar to the second embodiment, the positive electrode side heat sink 8b is press-fitted. The configuration of each part of the first generator output terminal 16 is the same as in the first and second embodiments.

  A bush 18 is disposed on the outer peripheral side of the embedded portion 16b and the bolt shaft portion 16c of the first generator-side output terminal 16 with a gap therebetween. The bush 18 is formed of a metal cylindrical member as in the first and second embodiments. One end face in the axial direction of the bush 18 (end face on the head 16a side) is in contact with the positive-side heat radiating plate 8b of the rectifier 8. The other end surface in the axial direction of the bush 18 (the end surface on the bolt shaft portion 16c side) is in contact with a terminal portion 19a of a second generator-side output terminal 19 described later.

  The bolt shaft portion 16c is exposed from the other end portion in the axial direction of the bush 18 as in the first and second embodiments. The terminal portion 19a of the second generator-side output terminal 19 is attached to the bolt shaft portion 16c while being in contact with the other axial end surface of the bush 18, and is tightened by a nut 17 screwed into the bolt shaft portion 16c. It is done. The end surface on the other side in the axial direction of the bush 18 becomes a seating surface of the nut 17 as in the first and second embodiments.

  In this embodiment, unlike the generator side output terminals and bushes of the first and second embodiments, the first generator side output terminals 16 and bushes 18 are accommodated in the space between the end bracket 3 and the rear cover 9. Thus, the axial lengths of the first generator-side output terminal 16 and the bush 18 are shorter than those of the first and second embodiments.

  By tightening the nut 17 to the bolt shaft portion 16c, an axial force due to the tightening of the nut 17 acts between the nut 17 and the head portion 16a. This axial force acts in the same manner as in the first and second embodiments. Thereby, the terminal part 19a of the 2nd generator side output terminal 19 is fixed to the rear cover 9 side front-end | tip of the volt | bolt axial part 16c similarly to the case of the vehicle side output terminal of 1st, 2nd Example. As in the first and second embodiments, the nut 17 is restricted from rotating by receiving the axial force generated by the elastic force of the bush 18. As a result, the nut 17 is unlikely to loosen even when an external force is applied, as in the first and second embodiments.

  A second generator-side output terminal 19 extending in the radial direction is electrically connected to the first generator-side output terminal 16. The second generator-side output terminal 19 is a relay terminal in which a bolt-shaped terminal and a flat-plate terminal are integrated, and includes a terminal portion 19a, a head portion 19b, and a bolt shaft portion 19c.

  The terminal portion 19a is a terminal that is provided at one end in the radial direction of the second generator-side output terminal 19 (end portion on the first generator-side output terminal 16 side) and fixed to the bolt shaft portion 16c. And a flat surface facing the bolt shaft portion 16c. A through hole (not shown) through which the bolt shaft portion 16c passes is provided at the center of the terminal portion 19a. The plane of the terminal portion 19 a is larger than the outer diameter of the nut 17. A head portion 19b is provided on the vehicle side output terminal 13a side of the terminal portion 19a. The head portion 19b is an annular or disk-shaped collar portion, and has a flat surface that serves as a seating surface of the bush 20 described later. A bolt shaft portion 19c is provided on the vehicle-side output terminal 13a side of the head portion 19b. The bolt shaft portion 19 c is a rod-like portion, and a vehicle-side output terminal 13 a provided at the tip of the power cable (harness) 13 is connected (fixed). A screw portion 19d (male screw) is formed on the outer peripheral surface of the bolt shaft portion 19c. The outer diameter of the bolt shaft portion 19c is smaller than the outer diameter of the head portion 19b.

  A nut 21 is screwed to the vehicle-side output terminal 13a side tip of the bolt shaft portion 19c. The nut 21 is a member for fixing the vehicle-side output terminal 13a to the bolt shaft portion 19c by self-tightening.

  A bush 20 is disposed on the outer peripheral side of the bolt shaft portion 19c. The bush 20 is a metal cylindrical member having the same mechanical strength as that of the second generator-side output terminal 19, and is disposed opposite to the outer peripheral side of the bolt shaft portion 19c via a gap. The inner diameter of the bush 20 is larger than the outer diameter of the bolt shaft portion 19c. One end face in the radial direction of the bush 20 (end face on the first generator side output terminal 16 side) is in contact with the head 19b. The other end face in the radial direction of the bush 20 (the end face on the vehicle side output terminal 13a) is in contact with the vehicle side output terminal 13a. The outer diameter of the bush 20 is smaller than the outer diameter of the head 19b (the outer diameter of the head 19b is larger) or equivalent.

  The vehicle-side output terminal 13a is configured in the same manner as in the first and second embodiments. The power cable 13 is configured in the same manner as in the first and second embodiments, and extends in the circumferential tangential direction so as to move away from the generator 100.

  The vehicle-side output terminal 13a tip of the bolt shaft portion 19c penetrates the bush 20 and protrudes radially outward from the other radial end surface (vehicle-side output terminal 13a side end surface) of the bush 20 (away from the head portion 19b). Extending from the other end of the bush 20 in the radial direction and exposed to the outside. The vehicle-side output terminal 13a is attached to the bolt shaft portion 19c while being in contact with the other end surface in the radial direction of the bush 20, and is tightened by a nut 21 screwed into the bolt shaft portion 19c. The end surface on the other side in the radial direction of the bush 20 is a seating surface of the nut 21. By tightening the nut 21 to the bolt shaft portion 19c, an axial force due to the tightening of the nut 21 acts between the nut 21 and the head portion 19b. The axial force is the force acting in the central axis direction of the second generator-side output terminal 19 (the pressing force of the nut 21 acting from the vehicle-side output terminal 13a side to the first generator-side output terminal 16 side, The pressing force of the head 19b acting on the vehicle-side output terminal 13a side from the first generator-side output terminal 16 side). As a result, the vehicle-side output terminal 13a is pressed against the other end surface in the radial direction of the bush 20 from the radial direction (from the vehicle-side output terminal 13a side to the first generator-side output terminal 16 side) by the axial force generated by tightening the nut 21. Attached to the second generator-side output terminal 19 and fixed to the vehicle-side output terminal 13a end of the bolt shaft portion 19c.

  The bush 20 receives an axial force generated by tightening the nut 21 via the vehicle-side output terminal 13a. Thereby, the bush 20 is elastically deformed in the radial direction and contracts. In this manner, the bush 21 is elastically deformed and contracted in the radial direction, whereby the nut 21 is elastic (the axial force of the bush 20 and the axial direction relative to the axial force due to the tightening of the nut 21 (the second generator side output). The reaction force in the direction of the central axis of the terminal 19 is received. Axial forces in both axial directions (in the direction of the central axis of the second generator-side output terminal 19) also act between the radial end surface of the bush 20 and the head portion 19b based on the principle of action and reaction. The rotation of the nut 21 is restricted by the elastic force of the bush 20 and is difficult to loosen even when an external force is applied.

  Therefore, according to the present embodiment, the nut 21 can be prevented from loosening, and the electrical connection between the second generator-side output terminal 19 and the vehicle-side output terminal 13a can be maintained for many years. Reliability for electrical connection can be improved.

  A holding member 22 for holding the bush 20 in a predetermined position with respect to the second generator-side output terminal 19 is integrally formed on the outer peripheral side of the bush 20. The holding member 22 is made of a resin having electrical insulation, and has a coupling portion 22a coupled to the bush 20 (cylindrical and may be referred to as a cylinder portion) and a coupling portion at an interval of 180 °. It is comprised from the flange part 22b which protruded from two places of the outer peripheral surface of 22a.

  Each of the flange portions 22b includes a flange surface that faces the surface of the end bracket 3 on the rear cover 9 side, and a flange surface that faces the surface of the rear cover 9 on the end bracket 3 side. In each center portion of the flange portion 22b, one through hole 22c that penetrates from one flange surface toward the other flange surface is formed.

  The flange portion 22b and the through hole 22c constitute an engaging portion with an end bracket 3 described later.

  The coupling portion 22a extends in the radial direction along the outer peripheral surface of the bush 20, and the vehicle-side output terminal 13a-side tip protrudes outside from the rear cover 9 and is exposed to the outside. A part of the front end of the coupling portion 22a on the vehicle output terminal 13a side further extends in the radial direction. Accordingly, a part of the front end of the coupling portion 22a on the vehicle-side output terminal 13a side surrounds a part of the periphery of the connection portion (or fixed portion) between the second generator-side output terminal 19 and the vehicle-side output terminal 13a. A fence 22d (or an extension portion) is formed.

  In the present embodiment, the movement of the vehicle-side output terminal 13a is restricted by surrounding a part of the periphery of the connecting portion (or fixed portion) between the second generator-side output terminal 19 and the vehicle-side output terminal 13a with a fence 22d. In addition, an electrical short circuit due to contact between the rear cover 9 and the vehicle-side output terminal 13a is prevented.

  A protrusion (convex portion) 3c is integrally formed at a portion of the end bracket 3 facing the through hole 22c. The protrusion 3c is in the shape of a round bar, rises (projects) vertically from the rear cover 9 side surface of the end bracket 3 toward the rear cover 9, and engages with the through hole 22c by being inserted into the through hole 22c. ing. Accordingly, the rotation of the holding member 22 and the movement of the holding member 22 in the radial direction and the circumferential direction are restricted.

  A protrusion (convex portion) 9a is integrally formed at a portion of the rear cover 9 facing the through hole 22c. The protrusion 9a has a cylindrical shape having a diameter larger than that of the protrusion 3a and a short length in the axial direction, and rises (projects) vertically from the end bracket 3 side surface of the rear cover 9 toward the end bracket 3 side. In order to close the opening on the rear cover 9 side of the through hole 22c, it is arranged close to the through hole 22c and opposed to the through hole 22c. Thereby, the movement of the holding member 22 in the axial direction is restricted.

  The through hole 22c and the protrusions 3c and 9a are arranged coaxially. The outer diameter (axial section) of the protrusion 9a is larger than the inner diameter (opening section) of the through hole 22c and the outer diameter (axial section) of the protrusion 3c. In this embodiment, the case where the protrusion 9a for restricting the movement of the holding member 22 in the axial direction is provided on the rear cover 9 has been described. However, the protrusion 9a may be provided on the flange portion 22b.

  In this way, in this embodiment, the rotation of the holding member 22, the movement of the holding member 22 in the radial direction and the circumferential direction, and the movement of the holding member 22 in the axial direction can be restricted. The rotation of the bush 20 with respect to the terminal 19, the radial and circumferential movement of the bush 20, and the axial movement of the bush 20 can be restricted. Therefore, in this embodiment, the bush 20 can be held at a predetermined position with respect to the second generator-side output terminal 19.

  The assembly of the bush 20 to the second generator-side output terminal 19 requires only the assembly work of the holding member 22 to the end bracket 3 in which the protrusion 3c of the end bracket 3 is inserted into the through hole 22c of the flange portion 22b. It can be easily carried out without the work of screw tightening and assembly of a plurality of parts. Thereby, according to the present Example, since the assembly | attachment property to the 2nd generator side output terminal 19 of the bush 20 can be improved, the 2nd generator side output terminal 19 to the generator 100 can be improved. Assembling workability can be improved, and the manufacturing cost of the generator 100 can be reduced.

  Further, according to the present embodiment, when the bush 20 is assembled to the second generator-side output terminal 19, it can be easily performed without the work of tightening screws and assembling a plurality of parts. Defects such as missing items can be prevented. Therefore, according to the present embodiment, the reliability of the generator 100 can be improved.

  A fourth embodiment of the present invention will be described with reference to FIG.

  FIG. 6 shows an enlarged view of the configuration near the generator output terminal of the generator of this embodiment.

  This embodiment is an improved example of the third embodiment, and is configured to prevent foreign matter from entering from the opening of the rear cover 9.

  Components similar to those of the third embodiment are denoted by the same reference numerals as those of the third embodiment, and the description thereof is omitted.

  Unlike the third embodiment, the fence 9b surrounding a part of the connecting portion (fixed portion) between the bolt shaft portion 19c and the vehicle side output terminal 13a is formed integrally with the rear cover 9. The connecting portion 22a of the holding member 22 has a shorter axial length than that of the third embodiment. Thereby, the rear cover 9 side tip of the coupling portion 22a is located radially inward of the opening of the rear cover 9 (the position is closer to the first generator side output terminal 16).

  A groove (a depression or a recess) 22e is formed at the tip of the coupling portion 22a on the vehicle side output terminal 13a side. The groove 22e is a linear depression formed on the front end surface of the coupling portion 22a on the vehicle output terminal 13a side so as to be recessed in the radial direction from the vehicle output terminal 13a side toward the first generator output terminal 16 side. It is. A protrusion (projection) 9c is integrally formed at a portion of the rear cover 9 facing the groove 22e. The protrusion 9c engages with the groove 22e and is formed linearly along the groove 22e. When the rear cover 9 is assembled to the end bracket 3, the protrusion 9c is engaged with the groove 22e. Thereby, the labyrinth 15 is formed between the coupling portion 22a and the rear cover 9.

  Thus, in this embodiment, the labyrinth 15 is formed between the coupling portion 22a and the rear cover 9. Thereby, according to the present embodiment, it is possible to prevent foreign matter from entering the rear cover 9 from the opening of the rear cover 9.

The expanded sectional view which expands and shows the structure of the generator output terminal vicinity (I part of FIG. 2) of the alternating current generator for vehicles which is 1st Example of this invention. BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the whole structure of the alternating current generator for vehicles which is 1st Example of this invention. The expanded sectional view which expands and shows the structure of the generator output terminal vicinity of the alternating current generator for vehicles which is 2nd Example of this invention. The expanded sectional view which expands and shows the structure of the generator output terminal vicinity (IV part of FIG. 5) of the alternating current generator for vehicles which is 3rd Example of this invention. Sectional drawing which shows the whole structure of the alternating current generator for vehicles which is 3rd Example of this invention. The expanded sectional view which expands and shows the structure of the generator output terminal vicinity of the alternating current generator for vehicles which is 4th Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Frame, 2, 3 ... End bracket, 3c ... Protrusion, 6 ... Stator, 7 ... Rotor, 8 ... Rectifier, 9 ... Rear cover, 10 ... Generator side output terminal 11, 21 ... Nut, 12, 20 ... Bush, 13a ... Vehicle-side output terminal, 14, 22 ... Holding member, 14b, 22b ... Flange, 14c, 22c ... Through-hole, 19 ... Second generator-side output terminal, 100 ... Vehicle alternator ( Generator).

Claims (8)

A housing;
A stator housed and held in the housing;
A rotor housed in the housing and rotatably held, the rotor disposed to face the stator via a gap;
A rectifier that is housed and held in the housing and rectifies the power generation output of the stator;
A generator-side output terminal for taking out the rectified output of the rectifier to the outside of the housing;
A nut for fixing the vehicle-side output terminal to the generator-side output terminal;
It is provided via a gap on the outer peripheral side of the generator side output terminal, and has an end surface and a metal bush that serves as a seating surface of the nut,
The bush is integrally formed with a holding member having electrical insulation,
The holding member is formed with an engaging portion with the housing,
The bush
The engaging portion of the holding member is assembled to the generator-side output terminal by being engaged with the housing,
An AC generator for a vehicle, wherein the AC generator is tightened in an axial direction by a tightening force of the nut transmitted through the vehicle-side output terminal. In the vehicle alternator according to claim 1,
A protrusion for restricting movement of the holding member in the rotational direction is formed on the housing. In the vehicle alternator according to claim 1,
The vehicle alternator according to claim 1, wherein a protrusion for restricting movement of the holding member in the axial direction is formed on the holding member or the housing. In the vehicle alternator according to claim 1,
The housing includes
A protrusion for restricting movement of the holding member in the rotational direction;
An AC generator for vehicles, wherein a protrusion for restricting movement of the holding member in the axial direction is formed. In the vehicle alternator according to claim 2,
The engaging portion is
A flange provided on the holding member;
It is composed of a through hole formed in the flange portion,
The vehicle alternator according to claim 1, wherein the holding member is engaged with the housing by engaging the protrusion with the through hole. In the vehicle AC generator according to claim 4,
In the holding member,
A flange,
A through hole provided in the flange portion is formed,
The protrusion for restricting the movement of the holding member in the rotation direction is inserted into the through hole,
The vehicular AC generator, wherein the protrusion for restricting the movement of the holding member in the rotational direction and the protrusion for restricting the movement of the holding member in the axial direction face each other on the same axis. . In the vehicle alternator according to claim 1,
The holding member is formed with an extending portion exposed to the outside from the housing,
The extension portion surrounds a connection portion between the generator-side output terminal and the vehicle-side output terminal. In the vehicle alternator according to claim 1,
A depression is formed on one of the housing and the holding member, and a protrusion is formed on the other.
An AC generator for vehicles, wherein a labyrinth is formed by engaging the recess and the protrusion between the holding member and the housing.

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