Abstract: An electromagnetic switch for use in actuating a starter for automotive vehicles is provided. The switch includes fixed contacts, a moving contact, and a plunger shaft. The moving contact is joined to a plunger shaft through an insulator. The plunger shaft is to be moved magnetically to bring the moving contact into abutment with the fixed contact to establish electric communication between the fixed contact. The switch also includes a rotation holder working to hold the moving contact and the insulator from rotating relative to each other. Use of the rotation holder results in a decrease in wear of the insulator. This eliminates the need for the insulator to have an additional thickness which would be worn down, thus permitting the insulator to be reduced in thickness to shorten the overall length of the switch.

Abstract: An electromagnetic switch has a shaft and a movable contact member slidably supported by the shaft. The shaft is moved with a plunger when an electromagnet is formed of an electromagnetic coil receiving an electric current and attracts the plunger. The movable contact member is moved with the plunger and connects fixed contact members with each other to turn on the switch. The shaft has a shaft body and a projection projected from the shaft body. The movable contact member has a hole. The projection is inserted into the hole to pass through the hole, and the movable contact member is disposed on the shaft body. Then, the movable contact member is rotated so as to engage the projection with the movable contact member. Therefore, the projection prevents the movable contact member from coming out of the shaft.

Abstract: According to the invention, an electromagnetic switch includes a pair of fixed contacts, a movable magnetic core, a magnetic coil, and a fixed magnetic core. The movable magnetic core is configured to be moved by a magnetic attraction, thereby establishing an electrical connection between the fixed contacts. The fixed magnetic core is configured to create the magnetic attraction when the magnetic coil is energized. The fixed magnetic core has a base portion and a disc portion. The base portion is arranged to face the movable magnetic core. The disc portion is fixed to the base portion and formed of a stack of metal sheets including at least one base metal sheet and a balance metal sheet. The balance metal sheet has a thickness that is predetermined to balance a difference between a desired thickness of the disc portion and a total thickness of the at least one base metal sheet.

Abstract: An electromagnetic switch for use in actuating a starter for automotive vehicles is provided. The switch includes fixed contacts, a moving contact, and a plunger shaft. The moving contact is joined to a plunger shaft through an insulator. The plunger shaft is to be moved magnetically to bring the moving contact into abutment with the fixed contact to establish electric communication between the fixed contact. The switch also includes a rotation holder working to hold the moving contact and the insulator from rotating relative to each other. Use of the rotation holder results in a decrease in wear of the insulator. This eliminates the need for the insulator to have an additional thickness which would be worn down, thus permitting the insulator to be reduced in thickness to shorten the overall length of the switch.

Abstract: A starter is disclosed as having a housing carrying thereon a motor, and a pinion moving body including a pinion gear, operative to mesh with a ring gear of an engine to transfer a rotational force of the motor thereto, and a pinion shielding member connected to the pinion gear at a front end thereof. The pinion shielding member has an outer circular periphery, having an outer diameter greater than the diameter of the addendum circle of the pinion gear, and a bottomed cylindrical configuration formed with a hollow portion having a front opened end and a closed rear end. Further, a clearance between an inner circumferential periphery of the nose portion and the outer circular periphery of the pinion shielding member is minimized to avoid interference between the nose portion of the housing and the pinion shielding member.

Abstract: In an electromagnet switch, a stationary iron core is composed mainly of a base part and a disk part. The base part is faced to a plunger and the disk part is forcedly inserted and fixed to a boss part formed in the base part. The disk part is composed of a metal plate of ferromagnetic substance (iron plate) and another substance plate (made of resin or rubber and the like, for example,) of a smaller spring constant or a larger damping coefficient than that of the metal plate. The metal plate and another substance plate are laminated. Another substance plate absorbs or reduces the impact force when the plunger is electromagnetically attracted toward and collides with the base part. The propagation of a large impact noise or crashing sound is thereby suppressed, and as a result the impact noise can be reduced.

Abstract: In a commutator motor, a brush holding device includes a plurality of brush holders and a substantially annular holder plate. Each of the brush holders includes a holder frame, which receives a pair of brush and spring, and a bottom plate having two opposite side portions. The holder plate is disposed around a commutator and has a major surface on which a plurality of pairs of guide walls are formed; each pair of the guide walls defines a pair of grooves. The side portions of the bottom plate of each of the brush holders are respectively fit in a corresponding pair of the grooves defined by the guide walls. Each of the brush holders has a radially outer end that abuts an inner surface of a side wall of an end frame, whereby radially outward movement of each of the brush holders is restricted by the end frame.

Abstract: The clutch outer 24 is formed in the planet carrier 24 that outputs the orbital motion of the planetary gear 23, and the outer regulating part 33 is formed in the central part of the planet carrier 24. In the outer regulating part 33, he round hole 33a is formed in the central part of the direction of the diameter. The anti-motor side of the armature shaft 2 is inserted through the round hole 33a. The end part of the armature shaft 2 is inserted into the inside of the concave section 26b that passes through the round hole 33a provided on the outer regulating part 33. The armature shaft bearing 34 that is press fit in the inner circumference of the concave section 26b supports the armature shaft 2 relatively rotatable. Consequently, the deflection of the armature shaft 2 can be controlled, and the deflection of the clutch outer 24 can be controlled in the range of the smooth torque transfer of the one-way clutch 7.

Abstract: A method of monitoring a burn-in apparatus, which brings a heater and a temperature sensor into contact with various devices under test during a burn-in test and controls power consumption of the heater to adjust levels of temperature of the devices under test, wherein the temperature sensor detects temperature of a temperature control block in which the heater and the temperature sensor are arranged and with which a cooling liquid is in contact while the devices under test are not in contact with the heater and the temperature sensor, and the temperature sensor is diagnosed to be normal or not based on a result of detection.

Abstract: A starter includes a motor, an output shaft driven by the motor, a pinion gear provided on the output shaft, and a shifter. The output shaft has first helical splines that are formed on an outer periphery of the output shaft. The pinion gear has second helical splines that are formed on an inner periphery of the pinion gear to engage with the first helical splines. The shifter shifts the pinion gear along the output shaft through the engagement between the first and second helical splines, thereby bringing the pinion gear into mesh with a ring gear of an engine. Further, in the starter, X<Y, where X is the clearance between a bottom of the first helical splines and a top of the second helical splines, and Y is the backlash between a flank of the first helical splines and a flank of the second helical splines.

Abstract: The electromagnetic switch for use in a starter includes a solenoid including an excitation coil and a plunger, and an energization terminal through which a current is supplied to the excitation coil from an external battery. The excitation coil generating, when applied with the current, a magnetic attraction force to move the plunger in order to close a main contact of the starter to thereby energize a motor of the starter. The energization terminal is constituted by a male terminal having a plate-like shape and insert-molded in the mold cover, and a female terminal fixed to a coil bobbin of the excitation coil and connected with a lead wire of the excitation coil, the female terminal being provided with a fitting section to which the male terminal is fitted so that the male and female terminals are electrically connected to each other.

Abstract: An electric rotating machine has a stator generating a magnetic flux and a rotor with a columnar armature core and an armature coil wound on the core. The flux passes through the rotor. The rotor is rotatable around its center axis. The core has slots aligned along its circumferential direction. Each slot extends along an axial direction of the core. The coil has upper layer coil parts and lower layer coil parts alternately connected with one another. Each pair of upper and lower layer coil parts is received in one slot so as to place the lower layer coil part nearer to the center axis of the core than the upper layer coil part. A sectional area of the upper layer coil part received in each slot is larger than a sectional area of the lower layer coil part received in the slot.

Abstract: A starter which may employed in starting an engine is provided. The starter includes an electromagnetic actuator and a pinion carrier. The pinion carrier includes a pinion and a holder. The holder retains a shift lever and transmits movement of the shift lever, as achieved by a magnetic attraction produced by the electromagnetic actuator, to the pinion, thereby shifting the pinion into engagement with a ring gear joined to, for example, an engine. The holder is made of material smaller in specific gravity than the pinion. Specifically, the holder is lower in mass or weight than the pinion, thereby permitting the magnetic attraction required to shift the pinion carrier through the shift lever to be decreased. This permits the electromagnetic actuator to be decreased in size.

Abstract: In a starter, a grommet attached to a yoke of a motor supports a motor terminal plate made of metal. The motor terminal plate is inserted in a penetration hole formed in the grommet. A pig-tail of a positive electrode brush is connected to one end of the M terminal plate projecting toward the inside of the yoke through the penetration hole. The other end of the M terminal plate projecting toward the outside of the yoke through the penetration hole is inserted into the inside of the resin cover through an inser groove formed in the resin cover of the electromagnetic switch. The M terminal plate is positioned in the grommet in the insert direction thereof to limit the movement of the M terminal plate toward the electromagnetic switch side and the motor side. This configuration provides a stable position of the M contact against the resin cover.

Abstract: A starter includes a magnetic switch, a motor, and a terminal. The terminal fixed to both the magnetic switch and the motor and has two end portions in the longitudinal direction of the terminal. An end portion of the terminal confronts a movable contact within the magnetic switch. The other end portion of the terminal is connected to an electric circuitry of the motor therewithin.

Abstract: An electromagnetic switch is provided, which includes a solenoid, a housing member and a sealing member. The solenoid includes an electromagnetic coil which produces an electromagnetic force upon supply of current thereto and a case accommodating the solenoid. The housing member accommodates a pair of contacts of the switch, and is caulked and secured to the case through the sealing member. The sealing member has elasticity and prevents wobbling motions of the electromagnetic coil by the elasticity.

Abstract: A starter includes a motor and an electromagnetic switch disposed close to and radially outward of the motor. The switch includes a contacts cover, a terminal bolt, and a conductive metal member. The contacts cover is cup-shaped. The terminal bolt is secured in the contacts cover so as to extend in the axial direction of the motor through an end wall of the contacts cover. The metal member has a first and a second end portion. The first end portion is inserted in the contacts cover through a side wall of the contacts cover. The second end portion is located outside the contacts cover and electrically connected to the motor. The switch further includes a movable contact, a first fixed contact that is electrically connected to a power source via the terminal bolt, and a second fixed contact made up of the first end portion of the metal member.

Abstract: A magnet switch for a starter of the present invention includes a plunger and a switch frame. The plunger has a stepped part at the outer peripheral surface thereof. The switch frame has a projection at an end face thereof, the end face being opposed to the outer peripheral surface of the plunger. Engagement of the stepped part of the plunger with the projection of the switch frame can lock forward movement of the plunger, so that no impact force is imposed on the movable contact and the insulator. Thus, deformation of the movable contact and breakage of the insulator can be prevented, and the axial length of the magnet switch can be reduced to reduce the size of the magnetic switch.

Abstract: According to the present invention, there is provided a rotating electric machine which includes a field, an armature having an armature shaft and a commutator provided on the armature shaft, a brush to slide on the commutator during rotation of the armature, a brush holder holding the brush, and an end frame covering an end of the armature shaft, wherein the brush holder is directly fixed to the end frame. With such an arrangement, heat generated by the brush and transferred to the brush holder can be directly transferred from the brush holder to the end frame, thereby being effectively dissipated. Moreover, without any additional member intervening between the brush holder and the end frame, the parts count of the rotating electric machine is reduced, thus increasing the assembly accuracy and decreasing the manufacturing cost of the rotating electric machine.

Abstract: An electromagnetic switch has a shaft and a movable contact member slidably supported by the shaft. The shaft is moved with a plunger when an electromagnet is formed of an electromagnetic coil receiving an electric current and attracts the plunger. The movable contact member is moved with the plunger and connects fixed contact members with each other to turn on the switch. The shaft has a shaft body and a projection projected from the shaft body. The movable contact member has a hole. The projection is inserted into the hole to pass through the hole, and the movable contact member is disposed on the shaft body. Then, the movable contact member is rotated so as to engage the projection with the movable contact member. Therefore, the projection prevents the movable contact member from coming out of the shaft.