JP4244876B2 - Starter - Google Patents

Description

  The present invention relates to a starter provided with a planetary gear reducer.

For example, the starter with a speed reducer described in Non-Patent Document 1 includes a plate 110 that partitions a motor (not shown) and the planetary gear speed reducer 100 as shown in FIG. The plate 110 has an elastic body 120 such as rubber baked on its outer peripheral portion, and the elastic body 120 is assembled in contact with the inner peripheral surface of the center case 130 that houses the speed reducer 100 therein. Thus, the brush powder generated inside the motor is prevented from entering the reduction gear 100 side.
NIPPON ELECTRONICS ENGINEERING REPORT Publication date: March 15, 1987 Reference number 52-132

  However, the plate 110 shown in the above known technique (Non-Patent Document 1) is provided with a cylindrical portion 111 for passing the armature shaft 140 in the central portion in the radial direction. It is arranged on the outer periphery of the formed sun gear 150. In this case, a gap is generated between the cylindrical portion 111 and the portion without the teeth of the sun gear 150 (between the teeth), so that the seal between the cylindrical portion 111 and the armature shaft 140 is incomplete. It is difficult to prevent the brush powder from entering the speed reducer 100 side.

The plate 110 is positioned in the radial direction with respect to the center case 130 via the elastic body 120. In other words, since the elastic body 120 is disposed between the outer periphery of the plate 110 and the inner periphery of the center case 130, the plate 110 may be misaligned depending on how the elastic body 120 bends (the center of the plate 110 is centered). In some cases, it is difficult to assemble the cylindrical portion 111 through the armature shaft 140.
The present invention has been made based on the above circumstances, and its purpose is to reliably prevent foreign matter such as brush powder generated inside the motor from entering the speed reducer, and to reduce the armature and speed reduction. An object of the present invention is to provide a starter capable of preventing misalignment of a plate disposed between the machine and the machine.

(Invention of Claim 1)
This onset Ming, a motor having an armature inside the motor case to form a magnetic circuit, and a planetary reduction gear for decelerating the rotation of the armature, the motor case provided separately, armature and planetary A plate disposed between the gear reducer and having a central hole for passing the rotation shaft (armature shaft) of the armature in a central portion in the radial direction; and an outer periphery of the plate and an inner periphery of the motor case an outer seal member for sealing between, a starter Ru and a inner sealing member for sealing across the space between the inner and the armature plate on the entire circumference, the outer sealing member, axial reaction motor plate And a thin-walled lip portion that extends obliquely outward in the radial direction from the fixed portion toward the counter armature side, and a tip portion of the lip portion is a motor. It is in contact with the inner peripheral surface of the case. In addition, the outer surface of the plate is exposed without being covered by the outer seal member, and the outer surface of the plate is in contact with the inner peripheral surface of the motor case, thereby restricting the radial position of the plate. It is characterized by being.

According to the above configuration, the outer circumference of the plate and the inner circumference of the motor case are sealed by the outer seal member, and the gap between the inner circumference of the plate and the armature is sealed by the inner seal member. The child and the speed reducer can be partitioned by the plate without a gap. Thereby, it is possible to reliably prevent foreign matters such as brush powder generated inside the motor from entering the speed reducer.
Further, the plate can be centered by bringing the outer diameter surface of the plate into contact with the inner peripheral surface of the motor case. In other words, since the outer seal member is not sandwiched between the outer diameter surface of the plate and the inner peripheral surface of the motor case, the inner peripheral surface of the motor case does not affect the bending state of the outer seal member, and the radial direction of the plate The position is restricted. As a result, when the plate is inserted into the motor case and the armature shaft is passed through the central hole of the plate, the center of the plate is not displaced in the radial direction. Can be passed easily.
Further, when the plate is inserted into the motor case, the lip portion of the outer seal member is inclined to the opposite side of the plate insertion direction, so that the lip portion of the outer seal member does not hinder the insertion of the plate. The plate can be easily inserted into the motor case.

(Invention of Claim 2 )
The starter of the present invention is provided separately from a motor having an armature inside a motor case forming a magnetic circuit, a planetary gear reducer for reducing the rotation of the armature, and the armature, It is arranged between the planetary gear reducer and has a cylindrical bent portion protruding in the axial direction from its outer peripheral end. The outer periphery of this bent portion is press-fitted into the inner periphery of the motor case and assembled. A plate having a central hole for passing the rotating shaft (armature shaft) of the armature at the center in the direction, and an inner seal member for sealing between the inner periphery of the plate and the armature over the entire periphery It is characterized by providing.

  According to the above configuration, the outer periphery of the bent portion provided on the plate is press-fitted into the inner periphery of the motor case, thereby sealing between the outer periphery of the bent portion and the inner periphery of the motor case, and Since the inner periphery and the armature are sealed by the inner seal member, the armature and the speed reducer can be partitioned without a gap by the plate. Thereby, it is possible to reliably prevent foreign matters such as brush powder generated inside the motor from entering the speed reducer.

(Invention of Claim 3 )
The starter according to claim 1 or 2 , wherein the inner seal member hermetically seals between the inner periphery of the plate and the armature shaft by contacting the smooth outer peripheral surface of the armature shaft. Features.
The armature shaft is formed with a sun gear that meshes with the planetary gear of the planetary gear speed reducer, but is not the outer periphery of this sun gear, but the smooth outer peripheral surface of the armature shaft (that is, the armature shaft with no sun gear formed). By bringing the inner seal member into contact with the outer peripheral surface, the space between the inner periphery of the plate and the armature shaft can be hermetically sealed.

(Invention of Claim 4 )
The starter according to claim 3 , wherein the inner seal member includes an attachment portion attached to the inner periphery of the plate and a thin-walled lip portion extending inward from the attachment portion toward the reduction gear side in an oblique radial direction. The tip of the lip portion is in contact with the smooth outer peripheral surface of the armature shaft.
In this case, when the armature shaft is assembled into the center hole of the plate, the lip portion of the inner seal member is inclined in the armature shaft insertion direction, so that the lip portion of the inner seal member prevents the armature shaft from being inserted. The armature shaft can be easily passed through the central hole of the plate.

(Invention of Claim 5 )
The starter according to claim 1 or 2 , wherein the inner seal member is in contact with a smooth surface of the armature other than the armature shaft.
The inner seal member does not necessarily need to be in contact with the outer peripheral surface of the armature shaft, and by contacting the smooth surface of the armature other than the armature shaft, foreign matter such as brush powder can be prevented from entering the speed reducer side. it can.

(Invention of Claim 6 )
The starter according to claim 1 or 2 , wherein the inner seal member is attached to the armature side and is in contact with an inner peripheral portion of the plate.
The inner seal member does not necessarily have to be attached to the plate, but can be attached to the armature side and brought into contact with the inner periphery of the plate.

(Invention of Claim 7 )
The starter according to any one of claims 1 to 6 , wherein the motor case is divided into a yoke that forms a magnetic circuit and a center case that houses the planetary gear reducer. To do.
The present invention can also be applied to a starter in which a motor case is configured by combining a yoke and a center case.

  The best mode for carrying out the present invention will be described in detail with reference to the following examples.

FIG. 1 is a half sectional view of the starter 1.
The starter 1 shown in the first embodiment includes a motor 2 that generates a rotational force, a planetary gear reducer (described later) that reduces the rotation of the motor 2, and the rotational force of the motor 2 transmitted through the reducer. Output shaft 3, a pinion gear 4 disposed on the output shaft 3, and a function of pushing the pinion gear 4 in the counter-motor direction (left direction in FIG. 1) via a shift lever 5 and a motor circuit (not shown). 2), an electromagnetic switch 6 or the like that opens and closes contact means (described later).

In the motor 2, a plurality of permanent magnets 8 are arranged at equal intervals in the circumferential direction inside a motor case 7 that also serves as a yoke, and a field 9 is rotatably arranged inside the field. It is a DC motor configured. The field magnet may be a wound field magnet formed by winding a field coil around an iron core instead of using the permanent magnet 8.
The motor case 7 has a cylindrical shape that is open at both ends in the axial direction, one end side is combined with the front housing 10, and the other end side is combined with the end frame 11 to form an outer frame of the motor 2.

The armature 9 is formed by assembling an armature shaft 12 that forms a rotating shaft of the motor 2, an armature core 13 that is supported by the armature shaft 12, and a plurality of coil conductors 14 assembled to the armature core 13. Armature winding. In the armature winding, the end face on the side opposite to the reduction gear in the axial direction (the right side in FIG. 1) is formed as a commutator surface.
A brush 15 is disposed in contact with the commutator surface, and the brush 15 is pressed against the commutator surface by a brush spring (not shown).

The planetary gear reducer includes a sun gear 16 formed on the armature shaft 12, an annular internal gear 17 disposed inside the motor case 7, and a planetary gear 18 that meshes with both the gears 16, 17. . This speed reducer receives the rotation of the armature shaft 12 and revolves while the planetary gear 18 revolves around the sun gear 16 to reduce the rotation speed of the armature 9 to the revolution speed of the planetary gear 18 and output it. It is transmitted to the shaft 3.
A plate 19 (described later) is disposed between the speed reducer and the armature 9 so that foreign matter such as brush powder generated inside the motor 2 does not enter the speed reducer.
The output shaft 3 is arranged on the same axis as the armature shaft 12, and the rotation (revolution motion) of the planetary gear 18 is transmitted through the gear pin 20 that supports the planetary gear 18.

The pinion gear 4 is configured integrally with the clutch 21, and the rotation of the output shaft 3 is transmitted via the clutch 21.
The clutch 21 is helically connected to the outer periphery of the output shaft 3 and is disposed so as to be movable on the output shaft 3 integrally with the pinion gear 4. The clutch 21 rotates when the pinion gear 4 is rotated at a high speed by the rotation of the engine through the ring gear while the pinion gear 4 is engaged with the ring gear (not shown) of the engine after the engine is started. Is configured so as not to be transmitted to the output shaft 3.

The electromagnetic switch 6 receives an excitation coil 22 that is energized from a vehicle-mounted battery and generates a magnetic force by a closing operation of a start switch (not shown) provided in the motor circuit, and receives the magnetic force generated in the excitation coil 22 as shown in FIG. And a return spring 24 for pushing back the plunger 23 when energization to the exciting coil 22 stops and the magnetic force disappears.
The shift lever 5 connects the plunger 23 of the electromagnetic switch 6 and the clutch 21, and is provided so as to be able to swing around the fulcrum 5 a, and transmits the movement of the plunger 23 (movement in the left-right direction in the figure) to the clutch 21. be able to.

The contact means is a pair of fixed contacts (not shown) connected to the motor circuit via the two external terminals 25 and 26, and is movable in conjunction with the movement of the plunger 23 (or integrally with the plunger 23). The movable contact (not shown) is in contact with a set of fixed contacts, and is closed when both fixed contacts are connected. The movable contact is separated from the set of fixed contacts. Thus, the continuity between the two fixed contacts is cut off, and the open state is established.
The two external terminals 25 and 26 are a battery terminal 25 electrically and mechanically coupled to one fixed contact, and a motor terminal 26 electrically and mechanically coupled to the other fixed contact. It is attached to the contact cover 27 of the electromagnetic switch 6.

Next, the plate 19 will be described.
The plate 19 is provided in a disk shape having a central hole for passing the armature shaft 12 in the central portion in the radial direction.
An outer seal member 28 (see FIG. 2) that seals between the outer periphery of the plate 19 and the inner periphery of the motor case 7 is attached. The inner periphery of the plate 19 seals between the armature shaft 12. An inner seal member 29 (see FIG. 3) is attached. As shown in FIG. 3, a step portion 19a is provided on the inner peripheral side of the plate 19 in order to shift the position of the inner peripheral end of the plate to which the inner seal member 29 is attached to the armature 9 side (right side in the drawing) in the axial direction. Is provided.

As shown in FIG. 2, the outer seal member 28 is fixed to the outer peripheral portion of the surface of the plate 19 on the side opposite to the axial direction of the motor 19, and from the fixed portion 28 a toward the counter armature side (the left side in the drawing). A thin lip portion 28b extending outward in the oblique radial direction is provided.
As shown in FIG. 3, the inner seal member 29 is attached to the inner peripheral end of the plate 19, and extends from the attachment portion 29 a toward the reduction gear side (the left side in the drawing) inwardly in the radial direction. A thin lip portion 29b is provided.

  The plate 19 is inserted into the motor case 7 from one end side in the axial direction of the motor case 7 (left side in FIG. 1), and as shown in FIG. The plate 19 is positioned in the axial direction by pressing the outer periphery of the plate 19. At this time, the plate 19 is exposed without its outer diameter surface covered by the outer seal member 28, and the outer diameter surface of the plate 19 abuts against the inner peripheral surface of the motor case 7. The radial position is regulated. That is, the outer diameter of the plate 19 is slightly smaller than the inner diameter of the motor case 7 so that the plate 19 does not rattle in the radial direction inside the motor case 7.

The plate 19 inserted into the motor case 7 has a gap between the outer periphery of the plate 19 and the inner periphery of the motor case 7 when the lip portion 28 b of the outer seal member 28 contacts the inner peripheral surface of the motor case 7. When the lip portion 29 b of the inner seal member 29 is in contact with the outer peripheral surface of the armature shaft 12, the space between the inner periphery of the plate 19 and the armature shaft 12 is sealed.
As shown in FIG. 3, the lip portion 29b of the inner seal member 29 does not hit the tooth tip of the sun gear 16 formed on the armature shaft 12, and the armature shaft 12 on which the sun gear 16 is not formed is smooth. In contact with the outer peripheral surface. This is realized by providing a step portion 19a on the inner peripheral side of the plate 19 and shifting the position of the inner peripheral end of the plate toward the armature 9 in the axial direction.

(Effect of Example 1)
In the starter 1 described in the first embodiment, the space between the outer periphery of the plate 19 and the inner periphery of the motor case 7 is sealed by the outer seal member 28, and the space between the inner periphery of the plate 19 and the armature shaft 12 is the inner side. Since it is sealed by the seal member 29, the armature 9 and the speed reducer can be partitioned by the plate 19 without a gap. Thereby, it is possible to reliably prevent foreign matters such as brush powder generated inside the motor 2 from entering the speed reducer.

  Further, since the outer seal member 28 is fixed to the outer peripheral portion of the surface of the plate 19, the outer diameter surface of the plate 19 is not covered with the outer seal member 28 and is exposed. Accordingly, the plate 19 can be centered by bringing the outer diameter surface of the plate 19 into contact with the inner peripheral surface of the motor case 7. That is, since the outer seal member 28 is not sandwiched between the outer diameter surface of the plate 19 and the inner peripheral surface of the motor case 7, the inner peripheral surface of the motor case 7 is not affected by the degree of bending of the outer seal member 28. Thus, the radial position of the plate 19 is regulated. Thus, when the plate 19 is inserted into the motor case 7 and the armature shaft 12 is passed through the central hole of the plate 19, the center of the plate 19 is not displaced in the radial direction. Can be easily passed through the central hole of the plate 19.

  Further, the outer seal member 28 has a fixed portion 28a fixed to the outer peripheral surface of the plate 19 on the side opposite to the axial direction of the motor, and a lip portion 28b extending outwardly in the oblique radial direction from the fixed portion 28a toward the counter armature side. I'm out. As a result, when the plate 19 is inserted into the motor case 7, the lip portion 28 b of the outer seal member 28 is inclined to the side opposite to the insertion direction of the plate 19, so that the lip portion 28 b of the outer seal member 28 is Insertion of the plate 19 is not hindered, and the plate 19 can be easily inserted into the motor case 7.

  Further, the inner seal member 29 has a lip portion 29b extending inwardly in the oblique radial direction from the attachment portion 29a attached to the inner peripheral end of the plate 19 toward the reduction gear side. Thereby, when the armature shaft 12 is passed through the central hole of the plate 19, the lip portion 29b of the inner seal member 29 is inclined in the insertion direction of the armature shaft 12, so that the lip portion 29b of the inner seal member 29 is Insertion of the armature shaft 12 is not hindered, and the armature shaft 12 can be easily passed through the central hole of the plate 19.

  Further, since the plate 19 described in the first embodiment is provided separately from the motor case 7, the plate 19 is placed inside the motor case 7 in a state where the armature 9 is incorporated in the motor case 7. Can be inserted into. Alternatively, the plate 19 can be inserted into the motor case 7 prior to the armature 9, and then the armature 9 can be incorporated into the motor case 7, and the assembling order can be selected as appropriate.

FIG. 4 is a half sectional view of the starter 1.
In the second embodiment, an example in which the outer periphery of the plate 19 is press-fitted into the inner periphery of the motor case 7 and assembled will be described.
As shown in FIG. 4, the plate 19 has a cylindrical bent portion 19 b that protrudes from the outer peripheral end of the plate 19 toward the axially opposite armature side (the left side in the drawing), and the outer periphery of the bent portion 19 b is arranged inside the motor case 7. It can be assembled by press-fitting around.

  According to this configuration, by pressing the outer periphery of the bent portion 19 b into the inner periphery of the motor case 7, radial displacement (rattle) of the plate 19 can be prevented, and the plate 19 can be centered. . Further, since the gap between the outer periphery of the plate 19 and the inner periphery of the motor case 7 can be sealed without using seal parts, the outer seal member 28 described in the first embodiment can be omitted, and the number of parts can be reduced. . Note that the inner peripheral side of the plate 19 is sealed between the armature shaft 12 and the inner seal member 29 as in the first embodiment. Thereby, it is possible to reliably prevent foreign matters such as brush powder generated inside the motor 2 from entering the speed reducer.

FIG. 5 is a half sectional view of the starter 1.
In the third embodiment, an example in which the inner sealing member 29 is brought into contact with the smooth surface of the armature 9 other than the armature shaft 12 to ensure the sealing performance will be described.
As shown in FIG. 5, the inner seal member 29 is attached to the tip of a ring-shaped portion 19c formed by bending the inner peripheral side of the plate 19 toward the axial anti-reduction gear side (the right side in the drawing), and the lip portion 29b. The tip of (see FIG. 3) comes into contact with the surface of the insulating plate 30 disposed between the end face of the armature core 13 and the coil conductor 14, so that the space between the plate 19 and the armature 9 is hermetically sealed. it can.

Further, the outer peripheral side of the plate 19 can be sealed with the motor case 7 by the outer seal member 28 described in the first embodiment. Alternatively, as described in the second embodiment, the bent portion 19b (see FIG. 4) of the plate 19 can be pressed into the inner periphery of the motor case 7 and sealed. Thereby, it is possible to reliably prevent foreign matters such as brush powder generated inside the motor 2 from entering the speed reducer.
In addition, as a smooth surface of the armature 9 with which the lip portion 29b of the inner seal member 29 comes into contact, a connection portion 14a (see FIG. 5) between the coil conductors 14 can be adopted.

(Modification)
In the first to third embodiments, the inner seal member 29 is attached to the plate 19, but can be attached to the armature 9 side. That is, the inner seal member 29 is fixed to a smooth surface or the like on the armature 9 side, and the lip portion 29b is brought into contact with the inner peripheral portion of the surface of the plate 19, so that the space between the plate 19 and the armature 9 is hermetically sealed. can do.
The motor case of the present invention can also be divided into a yoke that forms a magnetic circuit and a center case that houses the reduction gear. In this case, the outer seal member 28 can be sealed by bringing the lip portion 28b into contact with the inner peripheral surface of the yoke or the inner peripheral surface of the center case.

1 is a half sectional view of a starter according to Embodiment 1. FIG. It is a fragmentary sectional view which shows the seal structure by an outer side sealing member. It is a fragmentary sectional view which shows the seal structure by an inner side sealing member. 6 is a half sectional view of a starter according to Embodiment 2. FIG. 6 is a half sectional view of a starter according to Embodiment 3. FIG. It is a fragmentary sectional view of a starter concerning a publicly known technique.

Explanation of symbols

1 Starter 2 Motor 7 Motor Case 9 Armature 12 Armature Shaft 16 Sun Gear (Planet Gear Reducer)
17 Internal gear (planetary gear reducer)
18 Planetary gear (Planetary gear reducer)
DESCRIPTION OF SYMBOLS 19 Plate 19b Bending part 28 Outer seal member 28a Outer seal member fixing part 28b Outer seal member lip part 29 Inner seal member 29a Inner seal member attachment part 29b Inner seal member lip part 30 Insulating plate (smooth surface of armature )

Claims (7)

A motor having an armature inside the motor case forming the magnetic circuit;
A planetary gear reducer that decelerates the rotation of the armature;
Provided separately from the motor case, disposed between the armature and the planetary gear speed reducer, and passing the rotating shaft (referred to as an armature shaft) of the armature through a central portion in the radial direction. A plate having a central hole for,
The starter and the outer sealing member, Ru and an inner seal member that seals around the entire circumference between the inner peripheral and the armature of the plate for sealing between the outer periphery of the plate and the inner periphery of the motor case Because
The outer seal member includes a fixed portion fixed to the outer peripheral surface of the plate on the side opposite to the axial direction of the plate, and a thin lip portion extending outward from the fixed portion toward the counter armature side in an oblique radial direction. And the tip of the lip is in contact with the inner peripheral surface of the motor case,
The outer surface of the plate is exposed without being covered with the outer seal member, and the outer surface of the plate is in contact with the inner peripheral surface of the motor case, so that the radial direction of the plate A starter characterized in that its position is regulated . A motor having an armature inside the motor case forming the magnetic circuit;
A planetary gear reducer that decelerates the rotation of the armature;
Provided separately from the motor case, disposed between the armature and the planetary gear speed reducer, and having a cylindrical bent portion protruding in the axial direction from the outer peripheral end of the motor case. A plate having a central hole for allowing the rotation shaft of the armature (referred to as an armature shaft) to pass through the central portion in the radial direction, and press-fitting the outer periphery of the motor case into the inner periphery of the motor case;
A starter comprising: an inner seal member that seals between the inner periphery of the plate and the armature over the entire periphery. The starter according to claim 1 or 2 ,
The inner seal member is hermetically sealed between the inner periphery of the plate and the armature shaft by contacting a smooth outer peripheral surface of the armature shaft. The starter according to claim 3 ,
The inner seal member is provided with an attachment portion attached to the inner periphery of the plate, and a thin-walled lip portion extending obliquely radially inward from the attachment portion toward the speed reducer side. A starter characterized in that a tip portion is in contact with a smooth outer peripheral surface of the armature shaft. The starter according to claim 1 or 2 ,
The starter, wherein the inner seal member is in contact with a smooth surface of the armature other than the armature shaft. The starter according to claim 1 or 2 ,
The inner seal member is attached to the armature side and is in contact with the inner peripheral portion of the plate. The starter according to any one of claims 1 to 6 ,
The starter characterized in that the motor case is divided into a yoke that forms the magnetic circuit and a center case that houses the planetary gear reducer therein.

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