JPH1182257A - Engine starter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To compose a supporting structure to a rear bracket of a rear end part of a rotational axis to reduce a cost and improve easy-to-assemble properties and avoid entrance of dust for a engine starter that includes a starter motor provided with a front bracket connected to both ends of a yoke and a rotational axis freely turnably supported with a rear bracket and that a front end part of the rotational axis freely turnably passing through the front bracket is connected to a pinion engaging to a starter ring gear for starting an engine through a reduction gear mechanism and an over running clutch. SOLUTION: A supporting hole 102 over an outside surface in a rear bracket 23 is provided to the rear bracket 23 being coaxial with a rotation axis 11, a rear end of the rotation axis 11 is turnably supported by a bearing metal 103 inserted with a pressure in the supporting hole 102, and an outer end opening part of the supporting hole 102 is plugged with a plug 104 to be attached to the rear bracket 23 after fitting the rear part of the rotation axis 11 in the bearing metal, 103.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing in which a front bracket and a rear bracket are joined to both ends of a cylindrical yoke, and fixed to a rotating shaft rotatably supported by the front bracket and the rear bracket. A starting motor including a rotor having a coil mounted on an iron core and a stator surrounding the rotor and fixed to an inner surface of the yoke, wherein a front end of a rotating shaft that rotatably penetrates the front bracket is an engine. The present invention relates to a starting device for an engine, which is connected to a pinion that can mesh with a starting ring gear for starting the engine via a speed reduction mechanism and an overrunning clutch.

[0002]

2. Description of the Related Art Conventionally, such a starting device has been already known, for example, from Japanese Utility Model Publication No. 2-223080.

[0003]

In the above-mentioned conventional starting device, a bottomed cylindrical bearing housing whose outer end is closed is provided on a rear bracket, and the rear end of the rotating shaft of the rotor is mounted on the bearing. The housing is rotatably supported via a ball bearing. However, from the viewpoint of cost reduction, it is desirable to use a bearing metal instead of a ball bearing.However, simply replacing the ball bearing with a bearing metal simply results in a bearing housing having a bottomed cylindrical shape. When fitting the rear end of the rotating shaft into the bearing metal press-fitted into the bearing housing, air does not escape, making it difficult to fit the rotating shaft into the bearing metal.
There is a problem in assembly workability.

The present invention has been made in view of the above circumstances, and has an engine having a rear end supporting structure of a rotating shaft capable of reducing costs, improving assembly workability and preventing dust from entering a casing. It is an object of the present invention to provide a starting device.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a casing comprising a cylindrical yoke having a front bracket and a rear bracket connected to both ends thereof, and a casing rotatable by the front bracket and the rear bracket. A starter motor including a rotor having a coil mounted on an iron core fixed to a rotating shaft supported by the rotor, and a stator surrounding the rotor and fixed to an inner surface of the yoke, so that the front bracket is rotatable. In a starting device for an engine, a front end of a penetrating rotary shaft is connected to a pinion that can mesh with a starting ring gear for starting the engine via a speed reduction mechanism and an overrunning clutch. A support hole extending between the inner and outer surfaces of the bracket is provided coaxially with the rotation axis, and the support hole is provided in the support hole. The rear end of the rotary shaft is rotatably supported by a bearing metal to be inserted, and an outer end opening of the support hole is a plug attached to a rear bracket after the rear end of the rotary shaft is fitted into the bearing metal. It is characterized by being blocked.

According to such a configuration, the rear end of the rotary shaft is rotatably supported by the rear bracket via the bearing metal, so that the cost can be reduced as compared with the configuration using a ball bearing. When the rear end of the rotating shaft is fitted into the bearing metal press-fitted into the supporting hole, the outer end of the supporting hole is open, so that the air is released to the outside according to the fitting of the rotating shaft. It is possible to escape, and the work of inserting the rotating shaft into the bearing metal becomes easy.Moreover, since the outer end of the support hole is closed by the plug after the rotating shaft is fitted into the bearing metal, dust and the like from the outside can be removed. There is no penetration into the casing of the starting motor.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

FIGS. 1 to 4 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a starting device, and FIG. 2 is an enlarged longitudinal sectional side view of a front portion of a starting motor and an overrunning clutch. 3 is an enlarged longitudinal side view of the rear part of the starting motor,
FIG. 4 is a cross-sectional view showing a process of assembling the rear end of the rotating shaft.

First, in FIG. 1, a rotation shaft 11 of a starting motor 10 is connected to a pinion drive shaft 1 via a gear reduction mechanism 12.
3 The pinion drive shaft 13 is connected to the clutch outer 14 a of the overrunning clutch 14 so as to allow relative movement in the axial direction.
3 and a sleeve 15 fixedly connected to the clutch inner 14b of the overrunning clutch 14
In addition, a pinion 16 that can mesh with a starting ring gear 17 for starting the engine is fixedly provided.

On the side adjacent to the starting motor 10, an overrunning clutch 1
An electromagnetic drive unit 18 for relatively moving the sleeve 4 and the sleeve 15 in the axial direction is disposed, and the pinion 16 is started by driving the overrunning clutch 14 and the sleeve 15 in the axial direction by the electromagnetic drive unit 18. It moves between a retracted position (position indicated by a solid line in FIG. 1) in which engagement with the ring gear 17 is released and a forward position (position indicated by a chain line in FIG. 1) in mesh with the ring gear 17 for starting. . The electromagnetic drive unit 18 is provided with a start switch 19 for controlling the operation of the starter motor 10 according to the operation of the electromagnetic drive unit 18.

The casing 20 of the starter motor 10 comprises a cylindrical yoke 21 sandwiched between a front bracket 22 and a rear bracket 23. The two brackets 22, 23 are fastened to each other by a plurality of through bolts 24. Is done. A stator 25 is fixed to the inner surface of the yoke 22 and a rotor 26 coaxially surrounded by the stator 25.
Is rotatably supported by a front bracket 22 and a rear bracket 23, respectively.

Referring also to FIG. 2, the rotor 26 includes an iron core 86 fixed to the rotating shaft 11 and a coil 87 mounted on an outer peripheral slot of the iron core 86. , A coil end 87a protruding from both ends of the iron core 26a, and the coil end 87a is formed in a ring shape as a whole.

The front bracket 22 has a rotating shaft 11
Bearing housing 8 for rotatably supporting the bearing
The needle bearing 89 is provided between the bearing housing 88 and the rotating shaft 11 that penetrates the bearing housing 88. Moreover, the bearing housing 88 extends rearward until it protrudes into the coil end 27a of the rotor 26 and is provided integrally with the front bracket 22. The bearing housing 88 is provided between the rear end of the bearing housing 88 and the rotary shaft 11. An annular sealing member 90, for example, a sealing member 90 made of felt impregnated with grease in this embodiment is provided, and a ring-shaped washer 91 for preventing the sealing member 90 from detaching from the bearing housing 88 is provided. It is arranged between the rear end of the housing 88 and the rotating shaft 11. Since the washer 91 is interposed between the rear end of the bearing housing 88 and the rotating shaft 11, the rotating shaft 11 that rotates at a high speed is
8 does not directly contact the rear end, and even if the washer 91 contacts the rear end of the bearing housing 88, the rotation speed of the washer 91 is lower than the rotation speed of the rotating shaft 11, so that
Even if the front bracket 22 is made of a relatively soft material such as an aluminum alloy, wear of the bearing housing 88 can be suppressed.

In FIG. 3, the rear bracket 23 includes
A cylindrical bearing housing 101 for rotatably supporting the rear end of the rotary shaft 11 is integrally provided so as to protrude outward, and is coaxial with the bearing housing 101 over an outer surface of the rear bracket 23. A cylindrical bearing metal 103 is press-fitted into the support hole 102 provided in the, and the rear end of the rotating shaft 11 is fitted into the bearing metal 103. That is, the rear end of the rotating shaft 11 is rotatably supported by the bearing housing 101 via the bearing metal 103. An annular storage recess 102a for storing grease is provided on the inner surface of the support hole 102. The bearing metal 103 has a plurality of communication holes 103a... That allow the outer end to communicate with the storage recess 102a. At intervals.

The outer end of the support hole 102 has a large-diameter hole 102a.
Are provided coaxially, and the outer end of the support hole 102, that is, the large-diameter hole portion 102 a is closed by a plug 104 attached to the bearing housing 101. An annular seal member 10 is provided between the inner surface of the inner end of the support hole 102 and the rotating shaft 11.
5. For example, in this embodiment, a sealing member 105 made of felt impregnated with grease is provided, and a ring-shaped washer 106 for preventing the sealing member 105 from detaching from the support hole 102 is provided with the rear bracket 23 and the rotating bracket. It is arranged between the shafts 11. Since the washer 106 is interposed between the rear bracket 23 and the rotating shaft 11, the rotating shaft 11 that rotates at a high speed can rotate the rear bracket 2.
3, the rotation speed of the washer 106 is lower than the rotation speed of the rotating shaft 11 even when the washer 106 contacts the rear bracket 23, so that the rear bracket 23 is made of, for example, an aluminum alloy or the like. Even when the rear bracket 23 is made of a soft material, the wear of the rear bracket 23 can be suppressed.

When the rear end of the rotating shaft 11 is supported by the rear bracket 23, first, as shown in FIG. 4A, a bearing metal 103 is press-fitted into a support hole 102 and a seal member 105 is mounted. Figure 4
As shown in (B), the rear end of the rotating shaft 11 is the bearing metal 1.
03 and the seal member 105. On this occasion,
The plug 104 is not yet attached to the rear bracket 23, and after the rotating shaft 11 is inserted, the dish-shaped plug 104 is inserted into the large-diameter hole at the outer end of the support hole 102 as shown in FIG. The plug 104 is attached to the rear bracket 23 by a method such as pressing the center of the plug 104 with impact.

Referring again to FIG. 1, a commutator 27 is provided on a portion of the rotor 26 on the side of the rear bracket 23, and a plurality of brush holders 28 fixedly supported on the inner surface of the rear bracket 23, and a commutator 27. The brushes 29 that are elastically biased in the sliding contact direction are held.

The front bracket 22 of the starting motor 10
A partly open end face of the protective case 30 opened to the starting motor 10 and the electromagnetic drive unit 18 is fastened by bolts 31. Between the protective case 30 and the front bracket 22, an outer surface of the front bracket 22 is provided. A flat cover member 34 forming a gear chamber 33 in cooperation with the provided recess 32 is sandwiched.

A solenoid case 35 of the electromagnetic drive unit 18 located on the side of the starting motor 10 is fastened to the opening end surface of the protection case 30.
Of the openings, portions other than the portion closed by the front bracket 22 and the solenoid case 35 are closed by a seal member 36. In this way, the opening of the protective case 30 is completely closed, and a sealed working chamber 38 is formed in the protective case 30.

The electromagnetic drive unit 18 has one end connected to the working chamber 3.
8, and a coil 40 that exerts an electromagnetic force for operating the movable core 39. The shaft 3 is coaxially connected to one end of the movable core 39.
9a, a spring receiving member 41 attached to the intermediate portion, and a solenoid case 35 covering one end of the movable core 39.
Between the spring receiving member 42 and the spring 43
The movable core 39 is urged by the spring 43 in a direction in which one end of the movable core 39 protrudes into the working chamber 38 side. When the coil 40 is excited, the movable core 39 moves against the spring force of the spring 43 to the position shown by the dashed line in FIG. 1 due to the electromagnetic force acting on the movable core 39.

A switch case 44 is fastened to the solenoid case 35 on the side opposite to the protection case 30, and a common contact 45 that operates together with the movable core 39 of the electromagnetic drive unit 18 is electrically connected to the common contact 45. The start switch 19 including a pair of individual contacts 46 and 47 fixed to the switch case 44 so as to be able to switch off is housed in the switch case 44. The common contact 45 is attached to an intermediate portion of a shaft portion 39b coaxially connected to the other end of the movable core 39 so as to be capable of relative movement in the axial direction. A stopper 75 for preventing the common contact 45 from detaching from the shaft 39b is fixed, and the common contact 45 is elastically urged by a spring 76 provided between the common contact 45 and the shaft 39b in a direction in which it comes into contact with the stopper 75. You. The two individual contacts 46 and 47 are fixed to the switch case 44 so as to face the common contact 45.
When the electromagnetic drive unit 18 in which the coil 40 is demagnetized is not operated, the start switch 19 switches the common contact 45 to the two individual contacts 46,
When the electromagnetic drive unit 18 is in the cut-off state separated from the drive unit 47 and energizes the coil 40, the start switch 1
Reference numeral 9 denotes a conductive state where the common contact 45 moves to a position where the common contact 45 resiliently contacts the individual contacts 46 and 47 as shown by the chain line in FIG.

The gear reduction mechanism 12 provided between the rotating shaft 11 of the starting motor 10 and the pinion drive shaft 13 includes a front bracket 22 of the starting motor 10 and a cover member 3.
4 is housed in a gear chamber 33 formed between the rotating shaft 11 and the outer peripheral gear 48 formed integrally with the rotating shaft 11.
The outer peripheral gear 4 is provided integrally with the pinion drive shaft 13 and
8 and an inner peripheral gear 49 meshing with the inner gear 8.

The front end of the rotating shaft 11 of the starting motor 10 is rotatably penetrated through the front bracket 22 and protrudes into the gear chamber 33. An outer peripheral gear 48 is integrally formed on the outer periphery of the front end of the rotating shaft 11. . Further, a bearing housing 50 is integrally provided on the front bracket 22 at a central portion in the gear chamber 33 so as to be adjacent to the rotary shaft 11, and the pinion drive shaft 13 has an axis parallel to the rotary shaft 11. The rear end of the bearing housing 50
It is rotatably supported via 1. The inner peripheral gear 49 is formed in a bowl shape that covers the outer peripheral gear 48 and the bearing housing 50, and is provided integrally with the rear end of the pinion drive shaft 13. And the cover member 34.

The overrunning clutch 14 is housed in the working chamber 38, and the clutch outer 14a and the clutch inner 1 are prevented from moving in the axial direction.
4b, a plurality of rollers 52 and a plurality of springs 53 are interposed. This overrunning clutch 14
Transmits power from the clutch outer 14a to the clutch inner 14b. When the rotational speed of the clutch inner 14b becomes higher than the rotational speed of the clutch outer 14a, the clutch inner 14b is allowed to idle.

A cylindrical portion 54 coaxially surrounding the pinion drive shaft 13 is coaxially and integrally connected to the clutch outer 14a. The cylindrical portion 54 is connected to the pinion drive shaft 13 via a helical spline 55, for example. Linked to
That is, the tubular portion 54 integrated with the clutch outer 14a
Is connected to the pinion drive shaft 13 so as to allow relative movement in the axial direction. Moreover, an annular groove 54a is formed on the outer periphery of the cylindrical portion 54.

The movable core 3 in the electromagnetic drive unit 18
One end of a shift lever 56 is connected to the front end of the shaft portion 39a integrally connected to the shaft 9. This shift lever 56
The other end of the shift lever 56 is bifurcated so as to sandwich the tubular portion 54 from both sides.
The rollers 57 are pivotally supported so as to be disposed in the annular groove 54a of the cylindrical portion 54. A holder 58 is supported on the protective case 30 so as to be movable in a direction parallel to the axis of the pinion drive shaft 13, and an intermediate portion of the shift lever 56 is rotatable on the holder 58 via a pin 59. And a spring 6 is provided between the seal member 36 and the holder 58.
0 is provided. Accordingly, in response to the operation of the electromagnetic drive unit 18, the cylinder portion 54, that is, the overrunning clutch 14 is pushed out in the forward direction (the right direction in FIGS. 1 and 2). The movement prevents an excessive reaction force from acting on the electromagnetic drive unit 18 side from the cylinder portion 54, that is, the overrunning clutch 14 side.

The rear end of the sleeve 15 arranged coaxially with the pinion drive shaft 13 is integrally connected to the clutch inner 14b. Opened bottomed storage hole 62
The bearing metal 63 is press-fitted into the storage hole 62, and the front end of the pinion drive shaft 13 is
3 is inserted.

A stopper 65 is mounted on the pinion drive shaft 13 near the opening end of the storage hole 62, and
A regulating step 66 is provided on the inner surface of the stopper 4 to contact the stopper 65 and regulate the forward movement of the overrunning clutch 14 and the sleeve 15.

The protective case 30 is provided with a shaft hole 67 which is coaxial with the sleeve 15, and the sleeve 15 penetrates the shaft hole 67 so as to be able to move in the axial direction and rotate around the axis. Sleeve 1 outside protective case 30
A pinion 16 is fixedly provided at an outer end, that is, a front end of the pin 5.

A bearing metal 70 is provided between the inner surface of the shaft hole 67 and the outer surface of the sleeve 15 to support the axial movement and rotation of the sleeve 15 around the axis. A dust seal 74 for preventing foreign matter from entering the bearing metal 70 is provided between the sleeve 30 and the sleeve 15.

Next, the operation of this embodiment will be described. The pinion 16 which can be engaged with the starting ring gear 17 for starting the engine is fixed to the sleeve 15 outside the protective case 30. Since the bearing metal 70 is provided between the shaft hole 67 provided in the protective case 30 and the sleeve 15 so as to be penetrated,
There is no need to provide an opening in the protective case 30 for meshing the pinion 16 with the starting ring gear 17. Therefore, the working chamber 38 in the protection case 30 can be formed as a closed space, and the intrusion of foreign matter into the protection case 30 is reliably prevented. The operation does not become smooth due to the influence of the invading foreign matter.

The rear end of the rotating shaft 11 is a bearing metal 103.
, And is rotatably supported by the rear bracket 23, so that the cost can be reduced as compared with the case using a ball bearing. Moreover, when the rear end of the rotating shaft 11 is fitted into the bearing metal 103 press-fitted into the supporting hole 102 of the rear bracket 23, the outer end of the supporting hole 102 is in an open state. It is possible to release air to the outside by
The work of inserting the rotary shaft 11 into the shaft 3 becomes easy, and the workability of the assembling work can be improved. Moreover, since the outer end of the support hole 102 is closed by the plug 104 after the rotary shaft 11 is fitted into the bearing metal 103, dust from the outside does not enter the casing 20 of the starting motor 10.

In addition, since the annular seal member 105 is provided between the rear bracket 23 and the rotary shaft 11, it is ensured that brush wear powder enters between the bearing metal 103 and the rotary shaft 11. Thus, smooth rotation of the rotating shaft 11 can be guaranteed. Moreover, since the seal member 105 is made of felt impregnated with grease, the seal member 105 can have a lubricating function in addition to the sealing function.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

For example, in the above embodiment, the starting gear 17
Although the pinion 16 that can be meshed with is arranged outside the protective case 30, the present invention can be applied to a starting device in which the pinion 16 is arranged inside the protective case 30.

[0036]

As described above, according to the present invention, the rear end of the rotating shaft is rotatably supported by the rear bracket via the bearing metal, so that the cost can be reduced. The outer end of the support hole is open when the rear end of the rotating shaft is inserted into the bearing metal, thereby facilitating the operation of inserting the rotating shaft into the bearing metal, and furthermore, inserting the rotating shaft into the bearing metal. Later, since the outer end of the support hole is closed by the plug, dust from the outside does not enter the casing of the starting motor.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a starting device.

FIG. 2 is an enlarged longitudinal sectional side view of a front portion of a starting motor and an overrunning clutch.

FIG. 3 is an enlarged vertical sectional side view of a rear portion of a starting motor.

FIG. 4 is a cross-sectional view showing a process of assembling a rear end portion of the rotary shaft.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Starting motor 11 ... Rotating shaft 12 ... Reduction mechanism 14 ... Overrunning clutch 16 ... Pinion 17 ... Ring gear for starting 20 ... Casing 21 ... Yoke 22 ...・ Front bracket 23 ・ ・ ・ Rear bracket 25 ・ ・ ・ Stator 26 ・ ・ ・ Rotor 86 ・ ・ ・ Iron core 87 ・ ・ ・ Coil 102 ・ ・ ・ Support hole 103 ・ ・ ・ Bearing metal 104 ・ ・ ・ Plug

Continued on the front page (51) Int.Cl. ⁶ Identification code FI H02K 7/10 H02K 7/10 E

Claims (1)

[Claims] 1. A casing (20) in which a front bracket (22) and a rear bracket (23) are connected to both ends of a cylindrical yoke (21), and the front bracket (22) and the rear bracket (23). An iron core (8) fixed to a rotating shaft (11) rotatably supported
6) a rotor (26) to which a coil (87) is attached;
A rotating shaft (10) including a starter motor (10) including a stator (25) surrounding the rotor (26) and fixed to the inner surface of the yoke (21), and rotatably penetrating the front bracket (22). 11) A front end of the engine is connected to a pinion (16) that can mesh with a starting ring gear (17) for starting the engine via a reduction mechanism (12) and an overrunning clutch (14). The apparatus, wherein the rear bracket (23)
A support hole (102) is provided coaxially with the rotating shaft (11) and extends between the outer surface of the rear bracket (23) and a bearing metal (10) press-fitted into the support hole (102).
In 3), the rear end of the rotary shaft (11) is rotatably supported, and the outer end opening of the support hole (102) is connected to the rear end of the rotary shaft (11) to the bearing metal (103). Plug (10) attached to rear bracket (23) after fitting
An engine starting device closed in 4).