Abstract: An electric starter comprising a dc motor; an output rotary shaft which is rotated by an armature shaft; an overrunning clutch fitted on the output rotary shaft so that the clutch is slidable in the axial direction thereof; a splined tube coupled to outer member of the clutch and engaged with the helical splines of the output rotary shaft so as to transmit the torque of the shaft to the outer member. A shift lever is engaged at the lower end thereof with the peripheral portion of the tube and at the upper end with the actuator of an electromagnetic switch provided at the peripheral portion of the dc motor, so that the lever is swingable about the fulcrum thereof, wherein the fulcrum is shaped as a cylindrical body, the bottom of the inside of which is shaped as an arc.

Abstract: A coaxial engine starter comprises an electric motor having a tubular armature rotary shaft and an output rotary shaft disposed at the front end of the electric motor and having at one end a pinion capable of engaging and disengaging an engine ring gear and axially slidably inserted into an inner bore of the armature rotary shaft at the other end. The starter also comprises a planetary speed reduction gear for reducing the rotational speed of the armature rotary shaft, an over-running clutch including a clutch inner member fitted on the output rotary shaft for transmitting the rotation of the armature rotary shaft to the output rotary shaft, and a front bracket including an inner front bracket connected to the electric motor and an outer front bracket connected to the inner front bracket is provided. Also provided is a ball bearing having an inner and an outer race for rotatably supporting the output rotary shaft.

Abstract: A starter device for an internal combustion engine comprises an output shaft driven by a motor, and a hollow cylindrical assembly disposed coaxially around and axially slidably on the output shaft, which assembly includes a hollow shaft splined to the output shaft, and a hollow cylinder disposed at the front side of the hollow shaft and coupled thereto through an overrunning clutch which transmits a rotational force in one rotational direction. Integrally formed at the front end of the hollow cylinder is a pinion which is placed into driving engagement with a ring gear of the associated engine when the axially slidable assembly is slid to a front position by a shift lever which urges the clutch to move in the axial direction. According to one aspect of the present invention, an annular sealing member is interposed between the hollow cylinder and the output shaft at an axial position in front of the sleeve bearing which rotatably supports the hollow shaft around the output shaft.

Abstract: A brush and terminal assembly for use in an engine starter having a motor including a commutator mounted on an armature rotary shaft comprises a support plate having two major surfaces, a central opening for receiving therein the commutator of the motor and a terminal bolt and a connection terminal unit. Positive and negative brushes are mounted to one side of the support plate and spring biased for resilient contact with the commutator in the central opening. A pair of stationary contacts are projectingly mounted to the other side of the support plate for use as contacts of an on/off switch of the electric motor, and two stationary contacts are electrically connected to the terminal bolt and the connecting terminal unit, respectively. The lead conductors connected to and extending from the positive brushes are connected together to the connecting terminal unit.

Abstract: A coaxial type starter device comprises a d.c. motor, a pinion provided at the front end of an armature rotary shaft of the d.c. motor and an output rotary shaft arranged in alignment with the armature rotary shaft so as to be movable in its axial direction so that a rotating force of the armature rotary shaft is transmitted to the output rotary shaft through a planet gear speed-reducing device and an overrunning clutch device, wherein a carrier for supporting each planet gear wheel has a cylindrical portion at its front end and the cylindrical portion is fitted to the outer circumference of an clutch outer member of the overrunning clutch device so as to cause a relative sliding movement in their circumferential directions when a predetermined torque is produced.

Abstract: A coaxial type starter device comprises an armature rotary shaft disposed in a dc motor, a rotary output shaft having a pinion at its one end and supported so as to be slidable in the axial direction, a solenoid-type an electromagnetic switch disposed in alignment with the axial line of the rotary output shaft, wherein the electromagnetic switch comprises a cylindrical casing surrounding through bolts extending in the axial direction along the inner circumferential surface of the casing, an exciting coil disposed in the casing and a plunger disposed at the inner part of the casing so as to be slidable in the axial direction. The exciting coil is in the shape of a race track in cross section and has a portion extending near the inner circumferential surface of the casing except for areas where the through bolts extend.

Abstract: A coaxial type starter with an overrunning clutch device has a clutch inner member which is provided with a cylindrical portion formed integrally therewith and extended forwardly; is rotatably supported by first and second bearings spaced apart in the axial direction so that they bear the cylindrical portion; and has a helical spline at the inner circumferential surface so as to be engaged with a helical spline formed at the outer circumferential surface of an output rotary shaft inserted in the clutch inner member so that a rotating force by the armature rotary shaft is transmitted to the output shaft.

Abstract: A rear housing structure of an electric motor device is disclosed, which comprises a cup-shaped rear bracket made of resin coupled to the cylindrical yoke. According to one aspect of the invention, the rear bracket is secured to the yoke by a through bolt which extends, at the head thereof, through a boss formed at the outside of the side of the bracket, and is fastened to the front frame coupled to the front (or output) side of the yoke. An abutment member, which may by integral with the yoke or the base plate for the brush of the motor, extends radially outwardly from the rear end of the yoke, so that the front end of the boss abuts against this abutment member. Thus, the fastening force of the through bolt is born by the abutment member and the development of the bending and tensile stresses in the bracket can be prevented. According to another aspect, the through bolt extends through the bottom of the cup-shaped rear bracket and runs within the yoke to be fastened to the front frame.

Abstract: A coaxial engine starter in which a solenoid switch is disposed behind an electric motor, a planetary speed reduction gear is disposed in front of the electric motor, and an ouptut rotary shaft is driven by the electric motor through the planetary speed reduction gear, a housing to which a bearing for receiving radial loads from the output rotary shaft is secured is integrally formed by a synthetic resin with an inner gear of the planetary speed reduction gear. A metallic flange for attaching the starter to an engine may be mounted to the housing by an electrically conductive securing member, and an electrical conductor for electrically connecting the flange to a motor yoke through the securing member may also be provided.

Abstract: With respect to an armature for use in an electric motor of an engine starter, or the like, an annular steel-plate ring (11) is fitted on the outer circumference of commutator segments (2) through insulating paper (12) for the purpose of stably maintaining strength in the connection between each of the commutator segments (2) to which armature coils (6) are connected and a resinmolding member (3) fixed to an armature rotary shaft (5).

Abstract: A coaxial starter which includes a motor having a tubular armature shaft to which an armature and a commutator are attached; an output shaft arranged at the front end side of the motor and having one end provided with a pinion disengageably engaged with a ring gear of an engine and the other end inserted into the inside path of the tubular armature shaft so as to be axially slidable, the output shaft having a large-diameter portion thereof; a driving power transmission device having an overrunning clutch for transmitting rotation force of the armature shaft through the overrunning clutch to the output shaft; a bearing provided between a front end surface of the armature shaft, perpendicular to the axial direction thereof and the end surface of the large-diameter portion of the output shaft; and an electromagnetic switching unit provided on a rear end side of the motor for energizing the motor and for sliding the output shaft.

Abstract: A coaxial engine starter comprising a solenoid switch assembly including a non-magnetic sleeve disposed side by side relative to the iron-system bushing for guiding the plunger in a moving space from its return position to the position in which the plunger abuts against the front magnetic path section. An end face of the rear magnetic path section on the side of the front magnetic path section is an outwardly facing slope surface. The direction of twist of the helical spline formed on the output rotary shaft is opposite to the direction of wind of the return coil spring.

Abstract: In an overhung type starting electric motor, a pinion part of a movable pinion cylinder is made smaller in inside diameter than a clutch inner part and a cylindrical part thereof, and a stepped part is provided between a helical spline part and the small diameter part of a rotary shaft in such a manner that a very small gap is formed between the stepped part and the inner cylindrical wall of the clutch inner part of the movable pinion cylinder, and a very small gap is formed also between the small diameter part of the rotary shaft and the inner cylindrical wall of the pinion part of the movable piston cylinder. A misalignment preventing ring is fitted in the clutch outer of an overrunning clutch to be slidable on the stepped part.

Abstract: An engine starter comprises a hollow armature rotary shaft having a plurality of cam surfaces of an over-running clutch mechanism and having at one end a reduced-diameter portion on which a sleeve member is press fit and at the other end a stopper. The sleeve member has a rolled portion on its outer circumference on which an armature core is secured by press fit so that the armature core is firmly held by the sleeve member and the stopper on the armature rotary shaft. The armature rotary shaft may have a polygonal cross-sectional outer configuration so that the armature core can be firmly press-fit onto polygonal armature rotary shaft. A method for concurrently brazing and magnetically annealing the armature core comprises heating the armature assembly between 780.degree. C. and 850.degree. C.

Abstract: A starting electric motor comprising: an armature rotary shaft on which an armature is mounted; a commutator mounted on the rear end portion of the armature rotary shaft; power supplying brushes slidably held on the commutator; brush holders which hold the brushes, respectively; a rear bracket of resin which rotatably supports the armature rotary shaft in association with a front bracket; a yoke having magnetic field means which is fixedly held between the rear bracket and the front bracket; a conducting base of electrically conductive material on which the brush holders are mounted, and which is held between the yoke and the rear bracket; through-bolts inserted into the rear bracket and the front bracket, tightening the yoke and the conducting base together; and metal plates provided between the seats of the through-bolts and the outer surface of the periphery of the rear bracket.

Abstract: A cylindrical yoke 3 of a d.c. motor of an engine starter having a planet reduction gear mechanism and a bracket 5 fitted on an extension of the yoke without relative rotation therebetween is formed integrally on an inner surface of the extension with internal gear teeth 4 of the planet reduction gear mechanism, which mesh with a solar gear 6 formed integrally on an armature shaft 2 of the motor through planet gears 7 supported by a flange 10 of an output shaft 11 of the starter. The motor is separated from the planet reduction gear mechanism by a flange 3b, 22 arranged therebetween and supporting a bearing 16 which supports the armature shaft.

Abstract: A D.C. motor comprising an armature core, an armature coil, a commutator and an armature shaft is disclosed. The armature shaft is provided with a whirl-stop portion having a length sufficient to allow the armature core and the commutator to be fixed to it. The whirl-stop portion may be formed by rolling or knurling.

Abstract: A starter includes a movable pinion cylinder mounted on a rotary output shaft so that the movable pinion cylinder is slidable on the rotary output shaft a by predetermined distance together with an overrunning clutch. The movable pinion cylinder has the front end portion formed into a pinion which is engaged with an engine ring gear, and the rear end portion formed into a clutch inner forming a part of the overrunning clutch. The starter further includes a cylindrical cap connected to the front end of the rotary output shaft to cover the front end portion of the rotary output shaft, a protrusion extended from the center of the end face of the cap toward the end face of the rotary output shaft, the protrusion having an air hole extended along the axial line thereof, and a hole formed in the end face of the rotary output shaft at the center to receive the protrusion.

Abstract: An engine starter is equipped with a motor having a cylindrical armature rotating shaft (3), a clutch mechanism (15) which transmits the rotational force of the motor, an output rotating shaft (17) which is disposed so as to be movable in the axial direction so as to mesh with the clutch mechanism (15), and a solenoid switch (25) which has a moving member (35) which pushes the output rotating shaft (17) in the axial direction by electromagnetic force and which causes a movable contact (39) to contact a stationary contact (40) and supply current to the motor. The rear portion of the output rotating shaft (17) and the front portion of the moving body (35) are both inserted into the cylindrical bore of the armature rotating shaft (3) from opposite ends. The rear bracket (7) of the motor is made from molded plastic.

Abstract: A starter used to start an engine of a vehicle includes an electric motor generating rotational force. The motor has an integrally formed cup-shaped casing one end of which is open, an armature disposed within the casing, a disk (or face) type commutator supported on a rotary shaft of the armature, and brush means having brushes pressed against a brush slide contact surface of the disk type commutator and a brush supporting member made of a resin material which retains the brushes axially slidably and which is rigidly secured to the closed end wall of the casing. Since the starter employs a disk type commutator, it is possible to accommodate the brushes in the brush supporting member together with the associated springs in one unit. Accordingly, the structure is simplified and the number of required parts is reduced considerably. Thus, assembly is extremely easy.