JP2000009003A - Pinion fixation structure for engine starting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure dust-proofness in an engine starting device whose pinion is projected from a front case at the time of meshing, and prevent promotion of abrasion caused by deterioration of tooth bearing of the pinion, and its rattling. SOLUTION: A shaft hole 67 on a front case 30 is formed with a bearing metal 70 and a dust seal 74 arranged outside thereof for preventing entering of foreign matter. A sleeve 15 which is fixed to a clutch inner 14b coaxially with a pinion driving shaft 13 is journalled by the bearing metal 70 movably in the axial direction and rotatably around an axis. A pinion 16 is attached to a front end of the sleeve 15 through a spline-engagement portion 68 and a cylindrical engagement portion 15a, while an E clip 69 is attached for preventing axial movement of the pinion 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an operating chamber formed in a front case which is fastened to a casing of a starting motor, and a pinion drive shaft is housed in the operating chamber when power from the starting motor is transmitted. A pinion, which is connected to the clutch outer of the overrunning clutch to allow relative movement in the axial direction and is capable of meshing with a starting ring gear for starting the engine, is in a retracted position at which engagement with the starting ring gear is released. Further, the present invention relates to a pinion fixing structure of an engine starting device that enables movement between a forward position meshed with the starting ring gear and is connected to a clutch inner of the overrunning clutch.

[0002]

2. Description of the Related Art Conventionally, such a pinion fixing structure of an engine starting device is already known, for example, from Japanese Utility Model Laid-Open No. 59-15828.

[0003]

Problems to be Solved by the Invention
In the pinion fixing structure disclosed in Japanese Patent Publication No. 828, since the pinion 6 and the inner sleeve 7 are integrated, when applied to a starting device that projects from the front case at the time of engagement, a bearing is provided between the sleeve portion and the pinion gear portion. Therefore, it is difficult to assemble the overrunning clutch with an integral structure, so that a structure aiming at improving dustproofness in this system is difficult. Therefore, it was considered that the sleeve portion and the pinion gear portion were divided. However, there was a possibility that rattling occurred in the pinion gear portion, resulting in deterioration of tooth contact or acceleration of wear.

The present invention has been made in view of such circumstances, and while ensuring dustproofness in a starting device in which a pinion gear projects from a front case when engaged with the front case,
An object of the present invention is to provide a pinion fixing structure that prevents deterioration of teeth contact and acceleration of wear caused by play.

[0005]

According to the present invention, there is provided a pinion drive in which a working chamber is formed in a front case which is fastened to a casing of a starting motor, and power from the starting motor is transmitted. The shaft is attached to the clutch outer of the overrunning clutch housed in the working chamber,
A pinion that is connected to allow relative movement in the axial direction and that can mesh with a starting ring gear for starting the engine,
In an engine starting device that is capable of moving between a retracted position in which engagement with the starting ring gear is released and a forward position in which the engagement with the starting ring gear is engaged, and which is connected to a clutch inner of an overrunning clutch, the engine starting device is provided on a front case. The shaft hole is provided with a bearing metal and a dust seal on the outer side to prevent foreign matter from entering, and a sleeve fixedly connected to the clutch inner coaxially with the pinion drive shaft moves in the axial direction. A pinion is attached to the front end of the sleeve via a spline engagement portion and a cylindrical engagement portion, and an E clip that prevents axial movement of the pinion is supported at the front end of the sleeve. The technical means of mounting was adopted.

[0006]

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.

1 and 2 show one embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a starting device, and FIG. 2 is an enlarged view of a main part of FIG.

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, the overrunning clutch 1 is connected to the pinion drive shaft 13.
An engagement switch 18 for relatively moving the sleeve 4 and the sleeve 15 in the axial direction is provided. The engagement switch 18 drives the overrunning clutch 14 and the sleeve 15 in the axial direction.
Between a retracted position (position indicated by a solid line in FIG. 1) in which the pinion 16 is disengaged from the starting ring gear 17, and a forward position (position indicated by a chain line in FIG. 1) in which the pinion 16 is engaged with the starting ring gear 17. Will be moved. The engagement switch 18 is provided with a contact 19 for controlling the operation of the starting motor 10 in accordance with the operation of the engagement switch 18.

The casing 20 of the starter motor 10 comprises a cylindrical yoke 21 sandwiched between a center bracket 22 and a rear bracket 23. The two brackets 22, 23 are mutually connected by a plurality of through bolts 24. Is concluded. A plurality of pole cores 25 around which a field coil is wound are fixed to the inner surface of the yoke 22, and the rotating shaft 11 of the armature 26 coaxially surrounded by the pole cores 25 is fixed by a center bracket 22 and a rear bracket 23 respectively. It is rotatably supported.

A commutator 27 is provided at a portion of the armature 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 in a direction in which the brush holder 28 comes into sliding contact with the commutator 27. The brushes 29 to be elastically biased are held.

The center bracket 22 of the starting motor 10
, A partially open end face of the front case 30 opened to the start motor 10 and the engagement switch 18 is fastened by bolts 31.
A cover plate 34 forming a gear chamber 33 in cooperation with the concave portion 32 provided on the outer surface of the center bracket 22 is sandwiched between the center bracket 22 and the center bracket 22.

On the open end face of the front case 30,
Engage switch 1 located on the side of starting motor 10
8 is fastened to the center bracket 2 in the opening of the front case 30.
Portions other than the portion closed by the engagement yoke 35 and the engagement yoke 35 are closed by the seal member 36. In this manner, the opening of the front case 30 is completely closed,
A closed working chamber 38 is formed in the front case 30.

The engagement switch 18 includes a movable core 39 having one end protruding into the working chamber 38 and a coil 40 for exerting an electromagnetic force for operating the movable core 39. A spring receiving member 41 attached to an intermediate portion of a shaft portion 39a coaxially connected to the engaging yoke 3 so as to cover one end of the movable core 39.
5 and a spring 4 between the spring receiving member 42 supported and supported.
The movable core 39 is urged by the spring 43 in a direction in which one end of the movable core 39 projects 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 engagement yoke 35 on the side opposite to the front case 30, and a common contact 45 that operates together with the movable core 39 of the engagement switch 18 is connected to the common contact 45.
The contact portion 19 including a pair of fixed contacts 46 and 47 fixed to the switch case 44 so that the cutoff can be switched 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 fixed contacts 46 and 47 are fixed to the switch case 44 so as to face the common contact 45.
When the engagement switch 18 in which the coil 40 is demagnetized is not operated, the contact portion 19 connects the common contact 45 to the fixed contacts 46 and 47.
When the engagement switch 18 is energized and the coil 40 is energized, the contact portion 19 is connected to the fixed contact 4 as shown by a chain line in FIG.
It moves to a position where it comes into resilient contact with 6, 47 and becomes conductive.

Referring also to FIG. 2, a gear reduction mechanism 12 provided between the rotating shaft 11 of the starting motor 10 and the pinion drive shaft 13 is provided between the center bracket 22 of the starting motor 10 and the cover plate 34. Gear chamber 33 formed between
An external gear 48 is formed integrally with the rotary shaft 11 and an internal gear 49 is provided integrally with the pinion drive shaft 13 and meshes with the external gear 48.

The front end of the rotating shaft 11 of the starting motor 10 is rotatably penetrated through the center 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. . A bearing housing 50 is integrally formed with the center bracket 22 at a central portion in the gear chamber 33 so as to be adjacent to the rotary shaft 11. 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 internal gear 49 is formed in a bowl shape that covers the bearing housing 50 and is provided integrally with the rear end of the pinion drive shaft 13. The axial movement of the pinion drive shaft 13 is performed by the bearing housing 50 and the cover plate 34. Is blocked by

The overrunning clutch 14 is housed in the working chamber 38. The clutch outer 14a and the clutch inner 1 are prevented from moving relative to each other in the axial direction.
4b a plurality of rollers 52 and a plurality of springs 53
・ It is interposed. The overrunning clutch 14 is connected to the clutch outer 14a and the clutch inner 14
Although power is transmitted to the clutch inner b, when the rotation speed of the clutch inner 14b becomes higher than the rotation 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. This cylindrical portion 54 is connected to the pinion drive shaft via a helical spline 55, for example. 13.
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.

As shown in FIG. 1, the engagement switch 1
8, the shaft portion 3 integrally connected to the movable core 39
One end of a shift lever 56 is connected to the front end of 9a.
The other end of the shift lever 56 is bifurcated so as to sandwich the cylindrical portion 54 from both sides. The other end of the shift lever 56 is arranged in the annular groove 54a of the cylindrical portion 54. , And the rollers 57 are supported. A holder 58 is supported on the front 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 60 is provided between the seal member 36 and the holder 58. Accordingly, the cylinder portion 54, that is, the overrunning clutch 14 is pushed in the forward direction (to the right in FIGS. 1 and 2) in response to the operation of the engagement switch 18.
By bending the spring 60 and moving the holder 58, it is possible to prevent an excessive reaction force from acting on the engagement switch 18 side from the cylindrical 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 front end of the pinion drive shaft 13 is coaxially inserted into the storage hole 62.

Inner surface of storage hole 62 and pinion drive shaft 1
A cylindrical bearing metal 63 as a first bearing metal is provided between outer surfaces of the bearing metal 3.
3 is pressed into the storage hole 62. Moreover, the bearing metal 63
Is provided with a spiral groove 64 extending between both ends of the bearing metal 63 along the axial direction.

A stopper 65 is mounted on the pinion drive shaft 13 near the opening end of the storage hole 62, and the cylindrical portion 5
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 front case 30 is provided with a shaft hole 67 coaxial with the sleeve 15.
Penetrates the shaft hole 67 to allow movement in the axial direction and rotation about the axis. A pinion 16 is attached to the outer end, that is, the front end of the sleeve 15 outside the front case 30 via a spline engaging portion 68 and a cylindrical engaging portion 15a. The axial movement of the pinion 16 with respect to the sleeve 15 is prevented. It is blocked by the E clip 69 attached to the sleeve 15.

A bearing metal 70 as a second bearing metal is provided between the inner surface of the shaft hole 67 and the outer surface of the sleeve 15 to support the movement of the sleeve 15 in the axial direction and the rotation around the axis. Moreover, an annular storage recess 71 for storing grease is provided on the inner surface of the shaft hole 67,
An annular recess 72 corresponding to the storage recess 71 is provided on the inner surface of the bearing metal 70, and a plurality of communication holes 73 connecting the storage recess 71 and the annular recess 71 are formed in the bearing metal 70.
Are provided at a plurality of locations spaced apart in the circumferential direction.

A dust seal 74 is provided outside the bearing metal 70 between the front case 30 and the sleeve 15 to prevent foreign matter from entering the bearing metal 70 side.

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 penetrates the shaft hole 67 provided in the front case 30 and extends outside the shaft hole 67. The pinion 16 is fixed to the sleeve 15 via a spline engaging portion 68 and a cylindrical engaging portion 15a at the front end thereof. And the cylindrical engagement portion 15a secures the concentric accuracy of the sleeve 15 and the pinion 16, and there is no backlash in the pinion 16.

Further, since the bearing metal 70 is provided between the shaft hole 67 and the sleeve 15, the pinion 1
It is not necessary to provide an opening in the front case 30 for meshing with the starting ring gear 17 of FIG. Therefore, it is possible to form the working chamber 38 in the front case 30 as a closed space, and it is possible to reliably prevent foreign substances from entering the front case 30, and to use the overrunning clutch 14 and the like housed in the working chamber 38. The operation does not become smooth due to the influence of the invading foreign matter.

If foreign matter enters the bearing metal 70 provided between the shaft hole 67 and the sleeve 15, the operation of the sleeve 15, that is, the pinion 16, may not be smooth. Front case 3
The dust seal 74 is provided between the bearing metal 70 and the sleeve 1 between the sleeve 1 and the sleeve 15.
It is also possible to reliably prevent foreign matter from entering between the gaps 5.

Although the embodiments of the present invention have been described in detail, 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.

[0031]

According to the present invention, a bearing metal is provided in a shaft hole provided in the front case, and a dust seal for preventing foreign matter from entering is provided on the outer side of the bearing metal, and the clutch inner is coaxial with the pinion drive shaft. A fixedly connected sleeve is axially supported by a bearing metal to enable axial movement and rotation around the axis, and a pinion is mounted on a front end of the sleeve via a spline engagement portion and a cylindrical engagement portion. At the same time, an E-clip that prevents the pinion from moving in the axial direction is attached, so that foreign matter can be reliably prevented from entering between the bearing metal and the sleeve, and foreign matter can be prevented from entering the front case and stored in the working chamber. There is no concern that the operation of the overrunning clutch, etc., which is in While ensuring the dust-proof property of the protruding starter, while transmitting the rotational force through the spline engagement section, the cylindrical engagement section ensures the concentric accuracy of the sleeve and pinion, resulting in tooth contact deterioration and backlash. It is possible to provide a pinion fixing structure that prevents accelerated wear.

[Brief description of the drawings]

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

FIG. 2 is an enlarged view of a main part of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Start motor 13 ... Pinion drive shaft 14 ... Overrunning clutch 14a ... Clutch outer 14b ... Clutch inner 15 ... Sleeve 15a ... Cylindrical engaging part 16 ... Pinion 17 ... -Starting ring gear 20-Casing 30-Front case 38-Working chamber 67-Shaft hole 68-Spline engagement part 69-E clip 70-Bearing metal 74-・ Dust seal

Claims (1)

[Claims] 1. A casing (2) for a starting motor (10).
A working chamber (38) is formed in a front case (30) fastened to the working chamber (0), and a pinion drive shaft (13) to which power from the starting motor (10) is transmitted is provided in the working chamber (38). A pinion (16), which is connected to a clutch outer (14a) of an overrunning clutch (14) accommodated in the clutch so as to allow relative movement in the axial direction and can mesh with a starting ring gear (17) for starting an engine.
Can move between a retracted position where the engagement with the starting ring gear (17) is released and a forward position where the engagement with the starting ring gear (17) is engaged, so that the clutch inner ( 14b)
In the engine starter connected to the above, a shaft hole (67) provided in the front case (30) is provided with a bearing metal (70) and a dust seal (74) for preventing foreign matter from entering the outer side. ) Is provided, and a sleeve (15) fixedly connected to the clutch inner (14b) coaxially with the pinion drive shaft (13) enables axial movement and rotation around the axis so that the bearing metal ( 70), and a spline engagement portion (68) and a cylindrical engagement portion (15a) are provided at the front end of the sleeve (15).
The pinion (16) is mounted through the E-clip (6) and prevents the pinion (16) from moving in the axial direction.
9) A pinion fixing structure for an engine starter, wherein the pinion fixing structure is mounted.