JPH07230751A - Magnet switch for starter - Google Patents

Abstract

PURPOSE:To prevent a cable from coming into contact with a DC electric motor in the case of receiving vibration to a vehicle while preventing magnetic flux from changing in a magnetic field device of the DC electric motor relating to a magnetic field generated when a current is applied to the battery cable. CONSTITUTION:The first/second fixed contacts 27, 28, provided to be opposed to a movable contact 23, are arranged in an internal peripheral part of a magnet switch cover 3c. The first fixed contact 27 is continued to a battery connection terminal 27a to connect a battery cable 30. The switch cover 3c is formed in a bottomed shape, to cover an opening part of a switch casing 1a. Also a motor cover 3d is formed in a bottomed shape, to cover an opening part of a motor casing 1b arranged in parallel to a magnet switch 18. A washer seat surface 29a of a washer 29, provided on a mounting seat surface 3b of the battery cable connection terminal 27a in the switch cover 3c, is protruded in an axial direction from a rear end part 3a of the motor cover 3d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starter magnet switch used for starting an internal combustion engine.

[0002]

2. Description of the Related Art A conventional starter having a magnet switch is shown in FIGS. 4 to 7 of Japanese Utility Model Publication No. 1-24830. The magnet switch 24 is arranged on the upper part of the DC motor 7, and is screwed to the front bracket 10 by a screw 11. The fixed seat surface 25a of the battery connection terminal 2 is located axially inward with respect to the rear end of the DC motor 7. Further, the cap 25 of the magnet switch 24 has a fixed seat surface 25a of the battery cable connection terminal 2 and a fixed seat surface 25b of the DC motor input terminal 26 formed with a step, and these fixed seat surfaces 25a, 25b. The battery connection terminal 2 and the DC motor input terminal 26 are fixed to each other by means of a washer 27. Since this fixed seat surface 25a projects from the fixed seat surface 25b,
There is disclosed a configuration in which the battery cable 3 can be attached from a direction that can freely rotate around 360 degrees.

[0003]

However, in the starter having the above-mentioned magnet switch, particularly in the low torque type reduction starter using the magnet as the field device of the DC motor, the fixed seat portion of the battery connecting terminal is the DC motor. Since it is located inward from the rear end of
When the battery cable is routed to the upper part of the DC motor and current is applied to the battery cable in this state, a magnetic field is generated around the battery cable, and this magnetic field changes the magnetic flux of the magnet of the field device, and the starter. There is a phenomenon that the performance deteriorates accordingly. Further, in the above-mentioned starter, the battery cable can be attached to the battery connection terminal from a direction that can freely rotate around 360 degrees, but since the battery cable is arranged above the DC motor, when the vehicle receives vibrations, the battery cable will be the worst case DC voltage. Contact with the electric motor may cause the insulation coating of the battery cable to peel off.

Therefore, the present invention prevents the magnetic flux of the magnetic field device of the DC motor from changing with respect to the magnetic field generated when current is applied to the battery cable, and when the vehicle is vibrated, the cable and the DC motor are separated from each other. An object of the present invention is to provide a starter magnet switch that prevents contact.

[0005]

In order to achieve the above-mentioned object, in claim 1, a fixed contact and a movable contact for connecting and disconnecting electricity to a starter motor for starting an internal combustion engine are provided inside,
In a magnet switch in which a battery connection terminal electrically connected to the fixed contact is provided at a rear end portion of a housing of a magnet switch so as to project outward, a connection seat surface of the battery connection terminal or a rear end portion of the housing casing is The starter motor is arranged so as to be located outward of the rear end of the housing of the starter motor.

Further, according to a second aspect of the present invention, there is provided a plunger which is movable along the axis, and a cylindrical magnet switch casing in which an exciting coil arranged so as to surround the outer peripheral portion of the plunger is arranged in the inner peripheral portion. A cylindrical motor casing arranged in parallel with the magnet switch casing and provided with a field device for generating magnetic flux in the inner peripheral portion thereof, a movable contact moved along with the movement of the plunger, and the movable contact. A fixed contact that is electrically connected to a battery connection terminal to which the battery cable is connected and separated is disposed on the inner peripheral portion, and the battery connection terminal is axially penetrated to support the magnet contact and also covers one end of the magnet switch casing. A cylindrical magnet switch cover, a cylindrical motor cover with a bottom covering one end of the motor casing, The washer that abuts the magnet switch cover and is engaged with the battery connection terminal, and the washer seat surface where the battery cable and the washer abut, project axially from the rear end of the motor cover. .

According to a third aspect of the present invention, in the magnet switch of the second aspect, the magnet switch casing and the motor casing are integrally formed of a magnetic material,
The magnet switch cover and the motor cover are integrally formed of a heat resistant resin material. According to a fourth aspect of the present invention, in addition to the magnet switch of the first aspect, the magnet switch is disposed rearward of the starter motor and is the same as or outside the outer diameter of the starter motor. It has a smaller outer diameter.

[0008]

According to the present invention, in claim 1, the connection seat surface of the battery connecting terminal to which the battery cable of the magnet switch is attached or the rear end portion of the magnet switch housing casing is the motor housing casing rear end portion. Since it is located further outward, the distance between the battery cable and the motor field device can be increased, so that the magnetic flux of the field device changes with respect to the magnetic field generated when current is applied to the battery cable. Can be prevented and the starter output does not decrease. Further, since the terminal of the battery cable can be easily assembled to the battery connection terminal from the direction of 360 degrees around the battery cable and the battery cable is not arranged on the motor, the battery cable can be installed in the housing of the DC motor even when the vehicle is subjected to vibration. It has the effect of preventing contact with.

Further, according to the present invention, the washer seat surface of the magnet switch cover to which the battery cable is attached projects axially from the rear end portion of the motor cover, so that the washer seat surface and the rear end portion of the motor cover are The distance can be set to be long, the change in the magnetic flux of the motor field device can be prevented satisfactorily, the starter output does not decrease, and the battery cable is DC even if the vehicle receives vibration. This has the effect of easily preventing contact with the housing of the electric motor.

Further, according to the third aspect of the present invention, the magnet switch casing and the motor casing are integrally formed of a magnetic material, and the magnet switch cover and the motor cover are integrally formed of a heat resistant resin material. Therefore, the number of parts can be reduced and the starter can be reduced. There is also an excellent effect that the physique can be downsized. Further, in claim 4, since the magnet switch is disposed rearward of the starter motor and has an outer diameter equal to or smaller than the outer diameter of the starter motor, the outer diameter of the starter motor is reduced. As a result, the magnet switch does not project, which greatly improves the assembling property of the starter.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the first embodiment shown in the drawings. 1 is a sectional view showing a first embodiment of the present invention,
2 is a front view of the starter casing of the first embodiment, FIG.
FIG. 4 is an explanatory diagram showing a mounting state of the battery cable of the first embodiment. Reference numeral 1 denotes a starter casing integrally formed of a magnetic material, which includes a magnet switch casing 1a for accommodating a magnet switch 18 and a motor casing 1b for accommodating an armature 2 which is rotationally driven. Reference numeral 3 is a starter cover integrally formed of a heat-resistant resin material, and includes a switch cover 3c that covers the opening of the magnet switch casing 1a and a motor cover 3d that covers the opening of the motor casing 1b. Further, the motor 34 includes a motor casing 1b and an armature 2 which will be described later and is arranged in the motor cover 3d.

A magnet 32 forming a field device is arranged on the inner peripheral portion of the motor casing 1b, and the armature 2 is further arranged on the inner peripheral portion thereof. The armature 2 includes an armature core 2a, an armature coil (not shown) embedded in the outer peripheral portion of the armature core 2a, and an armature shaft 2b press-fitted and fixed to the armature core 2a.

One of the armature shafts 2b is rotatably supported by a bearing 3e of the starter cover 3, and the other is rotatably supported by a bearing 6 arranged in a recess of a rotary output shaft 5 which will be described later. Further, a commutator 2c is fixed to one of the armature shafts 2b, and a brush 4 having a pigtail 4a fixed to the starter cover 3 via a second fixed contact 28 by a screw 26 is slidable on the outer peripheral portion of the commutator 2c. It is movably installed. A sun gear 2d is formed on the outer periphery of the other part of the armature shaft 2b. Further, on the other side of the armature shaft 2b, a rotary output shaft 5 located on the same axis as the armature shaft 2b is arranged, and one end of the rotary output shaft 5 is a center bearing fixed to the housing 8. The rotary output shaft 5 is movably supported by a bearing 12b provided on the shaft 12, and the other end of the rotary output shaft 5 is axially supported by a housing 8 via a bearing 7.

A flange-shaped protrusion 5a is formed at one end of the rotary output shaft 5 so as to protrude in the outer peripheral direction. The protrusion 5a is provided with a plurality of through holes 5b in the peripheral direction. Pins 10 that engage with the holes 5b are arranged, and a planetary gear 11 is provided to these pins 10 via a bearing 9.
Is rotatably held. The planet gears 11 mesh with the outer circumference of the sun gear 2d.

Further, an internal gear 12a is arranged on the inner peripheral surface of the center bearing 12 on the outer periphery of the flange-shaped protrusion 5a. Therefore, the sun gear 2
d, the planetary gear 11, and the internal gear 12a constitute a reduction mechanism. On the housing 8 side of the rotary output shaft 5, there is a torque converter 13 mounted on the vehicle side together with an automatic transmission (not shown). Is engaged with a helical spline (not shown) of the rotary output shaft 5. The shift lever 16 has one end engaged with the annular member 17 attached to the overrunning clutch 15 and the other end engaged with the joint portion 19 a of the plunger 19.

The rotary output shaft 5 is covered by a housing 8, and a through bolt 33 is connected between the housing 8 and the starter cover 3. Next, a plunger 19 is arranged on the inner peripheral portion of the magnet switch casing 1a, and the plunger 19 is guided by the sleeve 20 inside a cylindrical sleeve 20 made of a non-magnetic material such as brass. As described above, the sleeve 20 is set so as to be movable in the axial direction, and an exciting coil 25 is arranged on the outer periphery of the sleeve 20.

A stationary core 21 made of a magnetic material is set in the end portion of the sleeve 20, and the central portion of the stationary core 21 projects from the end surface of the plunger 19. An opening through which the drive shaft 22 penetrates is formed. A movable contact 23 is provided so as to face the surface of the stationary core 21 opposite to the plunger 19, and the movable contact 23 is integrally coupled with the drive shaft 22. here,
A compression spring 24 is interposed between the plunger 19 and the stationary core 21, and the spring 24 constantly sets the plunger 19 at a position away from the stationary core 21.

The end of the stationary core 21 is covered with the starter cover 3, and a pair of first fixed contact 27 and second fixed contact 28 facing the movable contact 23 are provided inside the starter cover 3. It has been burned. The first fixed contact 27 is provided with a battery connecting terminal 27a, the battery connecting terminal 27a is fitted to the starter cover 3, and the washer 29 contacts the mounting seat surface 3b of the starter cover 3 to engage the battery connecting terminal 27a. Has been done. The battery connection terminal 27a connects the battery cable 30 with the nut 31. Further, the washer seat surface 29a of the washer 29 on the mounting seat surface 3b of the starter cover 3 projects axially a length L from the rear end portion 3a of the starter cover 3.

Next, the operation of the above structure will be described. When a key switch (not shown) is turned on, the exciting coil 25 is energized and the plunger 19 is attracted. Then, the shift lever 16 engaged with the joint 19a is rotated clockwise in the drawing. Due to the rotation of the shift lever 16, the overrunning clutch 15 is advanced by being guided by a helical spline (not shown) of the rotary output shaft 5, and the movable contact 23, the first fixed contact 27 and the second fixed contact 28 are further moved. It is closed and the armature 2 is energized via the brush 4. Then, by the exciting magnetic flux of the magnet 32,
Armature 2 rotates. The rotation of the armature 2 is interlocked via the sun gear 5a of the armature shaft 2b.
The planetary gear 11 meshing with the null gear 12 is decelerated and rotated, and the protrusion 5b of the rotation output shaft 5 is decelerated and rotated.

This decelerated rotation is transmitted to the overrunning clutch 15 via a helical spline (not shown) of the rotation output shaft 5, and the overrunning clutch 15 slides on the rotation output shaft 15 and the pinion gear 15a becomes a ring gear. 14, the ring gear 14 rotates, and the engine starts. When the pinion gear 15a is reversely biased by the ring gear 14 after the engine is started, the rotation of the ring gear 14 is not transmitted due to the action of the overrunning clutch 15, and the armature 2 is prevented from overrotating. When the key switch is turned off by the completion of the start-up, the power supply to the magnet switch 18 is stopped, the plunger 19 is returned by the spring 24, and accordingly, the movable contact 23, the first fixed contact 27 and the second fixed contact. 28 is opened, and power supply to the armature 2 is stopped. And the pinion gear 15a
Disengages from the ring gear 14.

Next, FIG. 4 shows a second embodiment of the present invention. In this embodiment, a motor cover 3d for accommodating an armature and a magnet switch cover 3c for accommodating a magnet switch are separated. . A washer 29 is provided on the mounting seat surface 3b of the magnet switch cover 3c, and the washer 29 is engaged with the battery input terminal 27a. The washer seat surface 29a with which the battery cable abuts is the rear end portion 3 of the starter cover 3.
The length L projects from a in the axial direction.

According to the above-described embodiment, the washer seat surface 29a of the magnet switch cover 3c with which the battery cable 30 abuts projects axially by the length L from the rear end portion 3a of the motor cover 3d. −
Since the distance between the bull 30 and the field device 32 can be long, it is possible to prevent the change (demagnetization) of the magnetic flux of the field device 32 and the deterioration of rectification with respect to the magnetic field generated when a current is applied to the battery cable 30. , The starter output does not decrease.
Further, since the battery cable 30 can be easily assembled to the battery connecting terminal 27c from the direction of 360 degrees around the battery cable 30 and the battery cable 30 is not arranged on the motor 34, the battery cable 30 will not be placed on the motor 34 even if the vehicle receives vibration. It has the effect of preventing contact with.

If the starter cover 3 in which the motor cover 3d and the magnet switch cover 3c are integrally formed as in the embodiment of the present invention shown in FIG. 1 is used, the number of parts can be reduced and the starter size can be reduced. There is also a special effect. Further, as in the embodiment of FIG. 1, the magnet switch may be retracted so that the rear end of the magnet switch 18 and the rear end of the motor 34 are the same, and the starter cover 3 can be integrated with the second fixed terminal. It is possible to directly connect the brush 4 to the brush 4 from 28, the motor lead wire can be eliminated, and malfunction of the starter due to rusting of the motor lead wire can be prevented.

Further, in each of the above-mentioned embodiments, since the magnet switch 18 as a whole moves to the rear end side of the motor 34, a space is provided between the front part of the magnet switch 18 and the engine mounting part, and the pinion rest position. Can be set to a large value, the mountability of the starter can be improved, and it can be easily mounted especially on a vehicle with a torque converter.

Next, a third embodiment of the present invention will be described with reference to FIG. It should be noted that parts having the same numbers as those in the first embodiment have the same configuration, and detailed description thereof will be omitted. 101 is
The starter casing is made of a magnetic material and has a bottomed tubular shape, and constitutes a yoke of the starter motor 100. On the bottom portion 101a of the starter casing 101, the brush 4
A brush holding member 106 for accommodating is stored. The hole 101b of the starter casing 101 is engaged with the convex portion of the brush holding member 106.

In the center of the bottom portion 101a, there is provided a bearing holding portion 101c for inserting and holding the bearing 107 that supports the shaft 2b of the armature 2. A surface-shaped commutator 2c is fixed to the anti-sun gear 2d side of the armature 2, and a brush 4 is slidably contacted to the surface of the commutator 2c. 16 is a shift lever,
Reference numeral 108 denotes a shift lever drive arm. The shift lever 16 has one end engaged with an annular member 17 attached to the overrunning clutch 15, and the other end engaged with one end 108 a of the shift lever drive arm 108. The other end 108b of the shift lever drive arm 108 is a groove portion on the outside of the internal gear 12, a gap between each magnet 32 which is a fixed field of the starter motor 100, and the starter casing 10.
The hole of the bottom part 101a of No. 1 and the hole of the brush holding member are extended and engaged with the joint part 19a of the plunger 19.

The magnet switch 118 is arranged coaxially with the starter motor 100 and is arranged at the rear, and the magnet switch cover 103 having therein the plunger 19, the exciting coil 25, the stationary core 21, the movable contact 23, etc. The starter motor 100 is sandwiched by through bolts (not shown) and fixed to the housing 8. The magnet switch cover 103 is formed so as to have a diameter equal to or smaller than the outer diameter of the starter motor 100 (the same in FIG. 5).

Next, the plunger 19 is disposed inside the sleeve 20 made of a non-magnetic material so as to be movable in the axial direction so as to be guided by the sleeve 20, and further, the resin bobbin 104 is provided outside the sleeve 20. An exciting coil 25 wound around the coil is arranged. This exciting coil 25
Is clamped by a stationary core 21 made of a magnetic material, similarly to the bottomed cylindrical magnet switch casing 102 made of a magnetic material, and fixed inside the magnet switch cover 103.

Inside the magnet switch cover 103, a first fixed contact 27 and a second fixed contact 28 are fixed so as to face the movable contact 23. The second fixed contact 28 is formed on the conducting member 105. The conducting member 105 extends in the direction of the starter motor 100 so as to bypass the exciting coil 25 along the inner wall of the magnet switch cover 103, and the brush 4 Is electrically connected to the pigtail 4a by a screw 6.

The shift lever drive arm 108 is
It has an L shape, one end of which is engaged with the joint lever 19 a and the other end of which is engaged with the shift lever 16. Also, in the third embodiment, the shift lever 16 and the magnet switch 1
While the pinion pushing mechanism is composed of 8 and
In this embodiment, the shift lever drive arm 108, the shift lever 16 and the magnet switch 18 constitute a pinion pushing mechanism.

Next, the operation of the third embodiment will be described. When a key switch (not shown) is turned on, the exciting coil 25 is energized and the plunger 19 is attracted. Then, the shift lever drive arm 108 engaged with the joint 19a
Moves to the right in FIG. 5, and the shift lever 16 rotates counterclockwise in FIG. By this rotation of the shift lever 16, the overrunning clutch 15 is advanced by being guided by a helical spline (not shown) of the rotary output shaft 5, and further, the movable contact 23, the first fixed contact 27 and the second fixed contact 28 are moved. The armature 2 is closed, and the armature 2 is energized via the brush 4 to rotate the armature 2. This rotation is decelerated by the speed reduction mechanism to rotate the pinion gear 15a via the overrunning clutch 15 on the rotation output shaft 5. As a result, the overrunning clutch 15 slides on the rotation output shaft 5, and the pinion gear 15a meshes with the ring gear 14 to start the rotation of the engine.

After the engine is started, a key switch (not shown) is turned off, power supply to the exciting coil 25 is stopped, and the plunger 19 is returned by the spring 24. Along with this, the movable contact 23, the first fixed contact 27 and the first fixed contact 27 The contact with the second fixed contact 28 is released, and the power supply to the armature 2 is stopped. Then, the pinion gear 15 a disengages from the ring gear 14.

In the starter to which the magnet switch of this embodiment is applied, the magnet switch portion 118 is arranged at the rear end of the starter motor 100 on the side opposite to the pinion 15a, and further, the connection seat surface of the battery connection terminal (in this case, the washer). 29) is arranged behind the magnet switch portion 118, the battery cable 30 and the starter motor 10 are
The distance to the field device of 0 can be made larger. Therefore, the influence of the magnetic field generated when a large current flows when the starter motor 100 is driven on the battery cable 30 on the field of the starter motor 100 is further reduced, and the output reduction of the starter motor 100 is more effectively prevented. It becomes big.

Further, since the magnet switch 118 is arranged inside the outer diameter of the starter motor at the rear end of the starter motor 100, the magnet switch 118 is placed in the starter motor 1.
Unlike the conventional starter with a magnet switch arranged in parallel with No. 00, since there is no protruding portion on the outer diameter side of the starter motor 100, it does not interfere with other parts when the engine is mounted on the engine, and it is easy to assemble. Is greatly improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.

2 is a front view of the starter casing of FIG. 1. FIG.

FIG. 3 is an explanatory diagram showing a mounting state of the battery cable of FIG.

FIG. 4 is a partial side view showing a second embodiment of the present invention.

FIG. 5 is a sectional view showing a third embodiment of the present invention.

[Explanation of symbols]

1 Starter casing 1a Magnet switch casing 1b Motor casing 3 Starter cover 3a Motor cover rear end 3b Magnet switch cover washer mounting seat surface 3c Magnet switch cover 3d Motor cover 18 Magnet switch 19 Plunger 23 Moving contact 25 Exciting coil 27 First Fixed contact 27a Battery connection terminal 28 Second fixed contact 29 Washer 29a Washer seat surface 30 Battery cable 32 Field device (magnet) 34 Motor 100 Starter motor 118 Magnet switch

Claims (4)

[Claims] 1. A starter motor for starting an internal combustion engine has a fixed contact and a movable contact that connect and disconnect electricity to the starter motor, and a battery connection terminal electrically connected to the fixed contact is provided outside a rear end portion of a housing of a magnet switch. In the magnet switch provided so as to project in the direction, the connection seat surface of the battery connection terminal or the rear end portion of the storage casing is arranged outside the rear end portion of the storage casing of the starter motor. Starter magnet switch featuring. 2. A cylindrical magnet switch casing having an inner peripheral portion in which a plunger movable along an axis and an exciting coil arranged so as to surround the outer peripheral portion of the plunger are arranged, and the magnet switch casing. A cylindrical motor casing provided in parallel with a field device that generates a magnetic flux in the inner peripheral portion, a movable contact that is moved with the movement of the plunger, and a battery cable that comes in contact with and separates from the movable contact. A fixed bottom cylindrical magnet switch having a fixed contact electrically connected to a battery connection terminal to be connected, which is arranged in an inner peripheral portion, axially penetrates through and supports the battery connection terminal, and covers one end of the magnet switch casing. A cover, a bottomed cylindrical motor cover that covers one end of the motor casing, and the magnet cover A starter characterized in that a washer that abuts against a touch cover and is engaged with the battery connection terminal, and a washer seat surface on which the battery cable and the washer abut, are axially projected from a rear end portion of the motor cover. Magnet switch. 3. The starter according to claim 2, wherein the magnet switch casing and the motor casing are integrally formed of a magnetic material, and the magnet switch cover and the motor cover are integrally formed of a heat resistant resin material. Magnet switch. 4. The magnet switch is arranged rearward of the starter motor, and has an outer diameter that is the same as or smaller than an outer diameter of the starter motor. Item 1. A magnet switch for a starter motor according to item 1.