JPH0443859A - Coaxial starter - Google Patents

Abstract

PURPOSE:To solve the problem that a terminal bolt obstructs a coaxial starter in its installation in an engine and make it easy to assemble the starter by extending the terminal bolt outward, and connecting each fixed contact and a blush holder portion to each other using a connecting stud. CONSTITUTION:One fixed contact 61 is formed into the shape of L by a contact portion and a conductor portion 61a and the conductor portion 61a forming an axial side of the fixed contact 61 extends around the outer periphery of an exciting coil 51. 64a and 64b are insulating members in which fixed contacts 61,62 are embedded respectively, and are each fixed to the rear end of a magnetic passage case 55. A terminal bolt 63 is passed through the end portion of the conductor portion 61a of the fixed contact 61 and extended in its radial direction and passed through the magnetic passage case 55 via an insulating member 65 and fastened therewith by a nut 66. A lead wire from power supply side is connected to the terminal bolt 63. A connecting stud 77 made by a conductor having one end portion stuck to a blush holder 41 by means of screwing has the fixed contact 62 connected to the other end thereof by a nut 78. The lead wire of a blush 42 is connected directly or via the blush holder 41 to the connecting stud 77.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a coaxial starter for starting an internal combustion engine, in which an electromagnetic switch device is coupled to the rear of an electric motor section.

[Conventional technology]

FIG. 2 is a front view of a conventional coaxial starter disclosed in, for example, Japanese Unexamined Patent Publication No. 238445, with main parts cut away. In the figure, 1 is a DC motor, which is configured as follows. Field poles attached to 2ri yoke and 3ri yoke 2. The figure shows the case of permanent magnets. 4 is a rear pouffet, to which a pouf V retainer 6 is attached. Reference numeral 6 denotes an armature, which includes a hollow armature rotating wheel, an armature core 8 fixed to this rotating shaft, an armature coil lv9 attached to this armature core, and an armature coil lv9 fixed to the rotating shaft. It consists of a commutator 10 connected to an armature coil/L'9. The rear end of the rotary ring 7 is supported by the rear stiffener F4 via a bearing unit, and the front end side is supported via a bearing (both not shown) by a bearing support portion integrally formed at the front end of the yoke.

Reference numeral 13 denotes a front bracket connected to the yoke 2, which is connected to a planetary gear reduction device connected to a pinion (sun gear) formed on the outer diameter of the front end of the rotating shaft f, and a six-force rotating body of this reduction device. The inner layer includes a connected overrunning clutch (not shown).

Reference numeral 15 denotes an output rotating shaft whose rear end side is supported within the rotating shaft 7 through a sleeve bearing 16, and is connected to the clutch inner of the overrunning clutch by a helical spline through a helical to a threaded fin in the middle, and rotation is transmitted to the front end. A pinion 17 splined to the part is rotated.

Next, 20 is an electromagnetic switch device coaxially coupled to the rear side (play side) of the DC motor 1, and is configured as follows. 21 is an excitation coil wound around the bobbin 22, 23 is a fixed iron core applied to the front of the bobbin 22, and 2! The number is a guide bush made of a non-magnetic material that is fitted into the inner periphery of the bobbin 22 and fixed to the fixed iron core 23, and 25 is made of a non-magnetic material. In the magnetic path case, a movable iron core is opposed to the 025 rj fixed iron core 23 fixed to the front end of the magnetic path case, and is supported in a guide bush 24 so as to be freely movable in the axial direction. 38 is a compression spring for returning the movable iron core 26, and 2F is a coil spring 2 whose rear end is inside the movable iron core 26.
8, the rear end of the output rotating shaft 15 is pressed through one ball 29 at the front end.

A pair of fixed contacts each embedded in an insulating member 31 made of 30R1 synthetic resin, each with a terminal bolt portion 30a.
, 30b are exposed to the outside, and the terminal bolt portion 30a is connected to the power source (
Connect the lead wire from the storage battery) and connect the terminal bolt part 30b.
A lead wire 32 to the brush device is connected by a nut 33.

34 is an insulator 35a at the rear extension of the movable iron core 26.

35b, and corresponds to the rear side of the fixed contact 30 (on the left side in the drawing). A coil spring 36 is inserted between the movable iron core 26@ and the insulator 35a, and applies contact pressure to the movable contact 34. 3'7 is a cover made of non-magnetic material and attached to the rear of the magnetic path case.

The operation of the conventional coaxial starter described above is as follows. When the engine starting switch is turned on, the excitation coil 21 is energized and the movable iron core 26 is attracted to the fixed iron core 23. As a result, the push-in iron 27 moves forward, causing the eight-force rotating shaft 15 to move forward and causing the pinion 17 to engage with the ring gear of the engine. At the same time, the movable contact 34 contacts both fixed contacts 3oVcM to close the circuit to the armature coil/I/9 and energize it, causing the armature 6 to start and rotate. The rotation of the armature rotating shaft 7 is decelerated by the planetary gear reduction device, and is transmitted from the output rotating shaft 15 to the pinion F via the overrunning clutch to start and rotate the engine.

[BM to be solved by the invention] In the conventional coaxial starter as described above, the fixed contact 30
and the movable contact 34 are located on the rear end side of the magnetic path core on the fixed side,
Therefore, the terminal bolt portion 30a from the fixed contact 30,
30b had to be made to protrude in the radial direction at a position on the rear end side of the magnetic path core. If the terminal bolt parts 30a and 30b protrude in this position, depending on the engine, it may become an obstacle when installing the starter to the engine, or it may cause trouble when wiring the lead wire from the power supply. There was a problem.

This invention was made in order to solve all such inter-hearing problems, and in a case where a fixed contact and a movable contact are arranged at the rear of the output core, the terminal port from one fixed contact is is easily provided in the radial direction on the outer periphery of the excitation coil or in front of the fixed core, and the connection means from the other fixed contact to the brush holder is made with a simple structure within the case of the electromagnetic switch device. The purpose is to obtain a coaxial starter.

[Means to solve the problem]

In the coaxial starter according to the present invention, the contact chamber of the electromagnetic switch device is provided at the rear of the magnetic path core to prevent metal powder from entering between the movable core and the fixed core due to the opening of the contacts, and to prevent the movement of the movable core from entering between the movable core and the fixed core. In the type that eliminates obstruction, the terminal bolt from one fixed contact is extended radially at the outer periphery of the excitation coil or at the front position of the fixed iron core, and the connecting stud passed axially around the outer periphery of the excitation coil is inserted at the front end. It is coupled to the brush holder, connected to the lead wire of the brush, and connected to the other fixed contact at the other end.

[Effect]

In this invention, the contact chamber is arranged at the rear of the magnetic path core, and the terminal bolt from one fixed contact is brought out in the radial direction at the outer circumferential position of the excitation coil p or at the front position of the fixed core, In addition, the connection stud from the other fixed contact does not come out of the case, but is connected to the brush retainer in the axial direction, and connected to the lead wire of the GRA V. This makes assembly easier and allows for easy access to the engine. Eliminates installation obstacles.

〔Example〕

FIG. 1 is a sectional front view of a main part of a coaxial starter according to an embodiment of the present invention. In the figure, 1-3, 6-1
0, 15 to 1f, and 29 are the same as in the conventional device, and their explanation will be omitted. 40 is a rear bracket attached to the yoke 2; 41 is a plan holder attached to the rear bracket 40; the brush box 41& is insulated and supported;
2 has been inserted. Note that the plan holder 41 may be integrally formed of a synthetic resin material.

Reference numeral 50 denotes an electromagnetic switch device coaxially coupled to the rear side of the DC motor 1, and is configured as follows.

51ij: excitation coil wound around the bobbin 52; 53 is a fixed iron core applied to the front end of the bobbin 52; 54 is a guide made of a non-magnetic material fitted to the inner periphery of the bobbin 52 and fixed to the fixed iron core 53; Bush, 55i; made of i magnetic material;
A magnetic path core is formed by a magnetic path case which surrounds the outer periphery of the excitation coil 1v51 and is attached to the bracket 40, and a fixed iron core 53t is fixed within the front end. A movable core 56 faces the fixed core 53 and is supported within the guide shaft 54 so as to be freely movable in the axial direction. 57 is a movable iron core 66
584d is a hollow rod made of non-magnetic material that is press-fitted into the movable iron core 56 and extended forward to reach the hollow part of the armature rotating shaft 7; 59 is the rear end; is a push rod supported movably in the axial direction within the hollow rod 58 and pressed by a coil spring 60, and its front end presses against the rear of the output rotating shaft 15 through the steel ball 29't. 61 and 62 are a pair of fixed contacts arranged at the rear end of the magnetic path case 55. One fixed contact 61 is formed into an L-shape by a contact part and a conductor part 61a, and the conductor part 61a forming the axial side extends to the outer periphery of the excitation coil A151.
4a and 64b are insulating members made of synthetic resin molded products, with fixed long points 61 and 62 embedded, and magnetic path case 55.
is fixed to the rear end of the Conductor portion 61a of fixed contact 61
The terminal tube 3 is passed through the end of the terminal tube 3 and extended in the radial direction, passes through the A-way case 55' through an insulating member 65, and is tightened with a nut 66. A lead wire from the power supply side (storage battery) is connected to the terminal bolt 63. 077 is a connection stud made of a conductor whose one end is fixed to the brush holder 41 by screwing, etc., and the other end is fixed with a nut 78. Contact point 62 is connected.

The lead wire of the brush 42 is connected to the connection stud 77 either directly or via the brush holder 41 . The brush holder 41 may be made of a synthetic resin molded product, one end of the connection stud 77 may be embedded and held, and the lead wire of the brush may be connected to the connection stud 7'7 by brazing or the like.

67 is a contact 17I corresponding to the outer ends of the fixed contacts 61 and 62, supported by an insulating support 581C that is movably supported in the axial direction by a support $57, and an insulating contact plate 69 is placed between it and the end of the movable iron core 56. It is fitted. Contact pressure is applied to the movable contact 67 by a compression spring fitted between a retaining ring 71 fitted to the end of the 70ri support rod 57 and the insulating support. 72
is a cover attached to the magnetic path case 55, which is made of a non-magnetic material.

Next, the annular groove portion 53 on the inner peripheral side of the 73ri fixed iron core 53
A A bearing fixed to the inner periphery, for example a sleeve bearing, supports the rear end of the rotating shaft.

Note that a front bracket 13 is coupled to the front part of the yoke 2 in the same manner as in the conventional device described above, and houses a planetary gear reduction device and an overhunching foot.

In the device of the above embodiment, when the excitation coil 51 is energized, the movable iron core 56 is attracted to the fixed iron core 53, and the push rod 59 is advanced via the coil spring 60, which advances the output rotating shaft 15 and moves the pinion 17 of the engine. Engage with the ring gear.

At the same time, the movable contact 67 contacts the fixed contacts 6 and 62, energizing the armature coil 9 and rotating the armature 6.

As a result, the rotation of the armature rotating shaft rotates the pinion nearer in the same manner as in the conventional starter described above, thereby starting the engine.

When the power to the excitation coil/L15 is cut off, the output rotation shaft 15
is retracted and returned (by a return spring (not shown)), and the movable iron core 56 is also retracted and returned.

In the above embodiment, the terminal bottom 3 is connected to the excitation coil 5.
1, but it may be located in front of the fixed core 55C).

Further, in the above embodiment, the magnetic path case 55 also served as the magnetic path core, but after surrounding the magnetic path core and the outer periphery, the bracket 40
[Effects of the Invention] As described above, according to the present invention, the contact chamber of the electromagnetic switch device is arranged behind the magnetic path core, and the shaft is connected to the case from one fixed contact. Pass the conductor part around the outer periphery of the excitation coil in the direction, extend the terminal bolt outward in the radial direction at the outer periphery of the excitation coil or the front position of the fixed core, and connect the other fixed contact and the brush retainer part. Since the outer circumference of the excitation coil is connected to multiple connection studs passing through it in the axial direction, it solves the problem of the conventional terminal bolt position when installing it to the engine, and also allows the other fixed contact and the brush retainer to be easily connected to each other. The connecting means with the parts is simple, and assembly is easy.

[Brief explanation of the drawing]

FIG. 1 is a sectional front view of a main part of a coaxial starter according to an embodiment of the present invention, and FIG. 2 is a front view of a conventional coaxial starter, with a main part cut away. 1...DC motor, γ...armature rotating shaft, engineering 5...
・Output rotating shaft, 1 foo...pinion, 50...electromagnetic switch device, 51...exciting coil y152...bobbin, 53...fixed iron core, 55...magnetic path case, 56...
・Movable iron core, 59... Push rod, 61, 62...
・Fixed contact, 61a...Conductor part, 63...Terminal bolt, 64a, 64b...Insulating member, 67...Movable contact, 6th...Insulating support, 77...Connection nut , the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] An electric motor having a hollow armature rotating shaft, an output rotating shaft whose rear end side is supported within the armature rotating shaft, and whose front end is equipped with a pinion that engages with a ring gear of an engine when moving forward; When the excitation coil is connected coaxially to the rear part of the motor, the movable core is attracted to the fixed core, and the output rotating shaft is advanced through the push rod, and the movable contact engages the pair of fixed contacts. an electromagnetic switch device for closing and energizing the electric motor to rotate the armature rotation shaft; a reduction gear device disposed at the front of the electric motor for decelerating the rotation of the armature rotation shaft; A coaxial starter comprising an overrunning clutch connected to each other and transmitting deceleration rotation to the output rotating shaft, wherein the electromagnetic switch device includes the following elements. A fixed iron core disposed at the front end of the excitation coil, a magnetic path core surrounding the rear end and outer circumference of the excitation coil and coupled to the fixed iron core, one side insulated and supported by the rear end of the magnetic path iron core, and the other fixed contact, a movable core supported axially movably on the inner diameter side of the bobbin of the excitation coil and facing the fixed core; a movable core insulated and supported at the rear of the movable core and facing both the fixed contacts; a contact, a terminal bolt connected to a conductor portion extending axially from one of the fixed contacts to the outer periphery of the excitation coil, and extending radially outside at a position on the outer periphery or in front of the excitation coil; a connecting stud that passes axially around the outer periphery, is fixed to the brush holder of the electric motor at one end, and connects the other fixed contact at the other end;