JPH0623742Y2 - Starter motor device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a starter motor device for starting an engine mounted on a vehicle or the like.

[Problems to be Solved by Prior Art and Invention] Generally, in this type of starter motor device, power from a planetary reduction mechanism in which a motor drive shaft is a sun gear is used.
It is configured to transmit to a pinion shaft concentric with the motor drive shaft via a unidirectional rotation clutch, and further, the pinion shaft is axially shifted by a shift lever that is linked to the magnet switch and operates. There is something I did.

By the way, among these things, in addition to providing stable support of the pinion shaft and reducing inertial sliding of the pinion shaft, the pinion gear of the pinion shaft is provided at the tip end side and the unidirectional rotation clutch is provided at the base end side. These two points are supported on the casing side through appropriate bearing members, and the clutch inner of the one-way rotating clutch is helically spline-fitted to the pinion shaft so that the one-way rotating clutch moves in the axial direction. It is preferable to take care so that they do not move.

However, in this case, the engagement portion of the shift lever tip portion with the pinion shaft must be arranged between the both bearing portions, and the pinion shaft and the motor drive shaft are not concentric. It is not possible to adopt a structure in which the base end face of the pinion shaft is pushed by the shift lever, as shown in JP-A-56-47658. Therefore, conventionally, the pinion shaft and the shift lever are formed with a concave groove on the pinion shaft side, and the engaging arm formed into a bifurcated arc of the shift lever is locked in the concave groove. In contrast to the rotating one, the shift lever does not rotate, so that the two are brought into a sliding contact state, and the sliding contact resistance impairs the smooth rotation of the pinion shaft, thereby lowering the engine starting efficiency. There is a problem.

[Means for Solving the Problem] The present invention has been made in view of the above circumstances and was devised with the object of providing a starter motor device capable of eliminating these drawbacks. The first one is A planetary reduction mechanism in which the motor drive shaft serves as a sun gear, and a unidirectional rotation clutch in which power from the planetary reduction mechanism is transmitted to the clutch outer and which is set to transmit power only in the drive rotation direction on the motor side. A pinion shaft that is concentric with the motor drive shaft, is helically spline-fitted to the inner peripheral portion of the clutch inner of the one-way rotating clutch, and has a pinion gear integrally fixed at its tip end; and the pinion shaft. Bearing means for supporting a portion near the pinion gear fastening portion of the rotatably with respect to the housing in the axial direction and rotatable about the axial center,
A bearing that supports an outer peripheral position of the clutch inner facing the helical spline fitting portion in a center bracket so as to be rotatable about an axis, a magnet switch that is operated by turning on a start switch, and an operation of the magnet switch. The rod has a base end connected to the rod, and the tip has a shift lever engaged with the pinion shaft between the bearing means on the tip side and the bearing on the base side, and the engagement between the shift lever and the pinion shaft. If the bearing is pressed into the pinion shaft,
A pair of shift holders, each of which has an arc shape and flange portions formed on both ends, are externally fitted onto the outer periphery of the bearing from above and below to abut the flange portions, and the abutted flange portions are fitted with a substantially U-shaped clip. The shift lever is configured to have an engaging portion formed at the tip of the arc-shaped bifurcated end of the shift lever, and the engaging portion formed in the flange and the clip. The pinion shaft and the pinion shaft are rotatably supported via the bearing.

The second is a planetary speed reduction mechanism whose motor drive shaft is a sun gear, and the power from the planetary speed reduction mechanism is transmitted to the clutch outer so that power is transmitted only in the drive rotation direction on the motor side. Pinion gear that is concentric with the motor drive shaft and that is helically spline-fitted to the inner periphery of the clutch inner of the one-way rotation clutch and has a pinion gear integrally provided at the tip end thereof. A shaft, a bearing for supporting a portion near the pinion gear fastening portion of the pinion shaft so as to be rotatable about an axis with respect to the housing, and a peripheral bracket position of the clutch inner facing the helical spline fitting portion in the center bracket. ON the bearing and the starter switch, which supports the axis of rotation freely
And a base end portion of the magnet switch which is operated by the operation of the magnet switch and the base end portion of which is engaged with the pinion shaft side between the bearing on the tip end side and the bearing on the base end side. A shift lever is provided, and the outer periphery of a cylindrical sliding body integrally fitted with a bearing for supporting the tip end side of the pinion shaft on the housing side so as to be rotatable around the shaft center is provided with respect to the housing. The holder is projectingly formed on a cylindrical body which is slidably supported in the axial direction and is integrally fitted into the sliding body, and the holder is formed from a guide groove formed on the sliding body and directed in the axial direction. It is characterized in that the tip end engaging portion of the shift lever is engaged with the protruding tip end of the holder portion.

In any of these configurations, the present invention has the motor drive shaft and the pinion shaft arranged concentrically, but can reduce the inertial weight and the rotational load of the pinion shaft as much as possible. It was done like this.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, reference numeral 1 is a housing of a starter motor device, a motor portion 2 is arranged in the housing 1, and reference numeral 3 is a magnet switch. Reference numeral 4 denotes a speed reduction mechanism configured by a planetary gear system, in which a tip gear portion of a motor drive shaft 2a which is a sun gear thereof is a planetary gear 4a.
Meshes with. The planet gear 4a revolves around its own axis under the drive of the motor shaft 2a, but the output shaft 5 is fixed to the support shaft 4d supported by the planet gear 4a via the bearing metal 4c. ing. This output shaft 5
The inner peripheral surface of the outer peripheral cylindrical portion 5a is a one-way rotating clutch (the one-way rotating clutch is set to transmit power in the driving direction of the motor unit 2 but cut off power transmission in the opposite direction).
The clutch outer 6a of No. 6 is integrally connected to the clutch outer 6a by an appropriate connecting means such as a serration connection. Further, the clutch inner 6b has a cylindrical shape, but the tip side thereof protrudes beyond the end edge of the clutch outer 6a, and the pinion shaft 7 concentric with the motor drive shaft 2a is formed on the inner peripheral surface of the protrusion 6c. The base end portion of is fitted in a helical spline fitting 8 so as to be movable in the axial direction. Further, the outer peripheral surface of the projection 6c of the clutch inner 6b is rotatably supported by the center bracket 10 via a bearing 9.

A pinion gear 11 is integrally provided at the tip end portion of the pinion shaft 7 by a connecting means such as a serration connection. Further, a bearing 12 is provided on the base end side of the pinion shaft 7 with respect to the gear fixing position. It is supported by the housing 1 so as to be rotatable about the axis and movable in the axis direction through bearing means by bearing metal 13 fixed to the inner 12 of the shaft.

On the other hand, the base end portion of the shift lever 14 is connected to the operating rod 3a of the magnet switch 3, but the tip end portion of the shift lever 14 has a rotational difference (that is, a difference in rotation) between the pinion shaft 7 and the shift lever 14. The pinion shaft 7 rotates at a high speed, but the shift lever 14 does not rotate.

That is, the tip portion of the shift lever 14 is branched into an arc bifurcated shape, and the engaging portion 14a is formed at the tip thereof. on the other hand,
The inner of the bearing 15 is integrated with the pinion shaft 7 by press fitting, but a pair of shift holders 7a in the shape of arc-matching split is externally fitted to the outer side of the pinion shaft 7 from above and below, and a collar formed at both ends of the shift holder 7a. A clip 7c having a substantially U-shape is externally fitted to a member in which the members 7d are abutted from above and below to clamp the flanges 7d, and the engaging holes 7b are formed in the flange 7d and the clip 7c, respectively. , 7e, the shift lever 14 and the pinion shaft 7 are connected to each other with the bearing 15 interposed therebetween. When the magnet switch 3 is actuated by turning on a start switch (not shown), the shift lever 14
Oscillates, and the pinion shaft 7 that rotates by receiving the driving force of the motor drive 2 moves in the direction of the arrow according to the helical spline fitting 8, which causes the pinion gear 11 protruding from the housing 1 to move to the engine side. The engine is started by meshing with the ring gear 30.

In the embodiment of the present invention constructed as described above, when the engine is started by turning on the start switch, the pinion shaft 7 is shifted in the direction of the arrow by the swing of the shift lever 14 accompanying the operation of the magnet switch 3. The pinion gear 11 meshes with the ring gear 30 to start the engine. In this case, the base end portion of the pinion shaft 7 is attached to the clutch inner 6b of the one-way rotating clutch 6 by the helical spline fitting portion 8. The clutch inner 6b is supported in a movable relationship in the axial direction and has a portion corresponding to the helical spline fitting portion 8 in the center bracket 10.
The pinion shaft 7 is supported on the housing 1 side through a bearing member composed of a bearing 12 and a bearing metal 13, and the support structure is rotatably supported around the shaft center. The pinion shaft 7 has a two-point support structure that prevents misalignment. Moreover, in this case, the pinion gear 1
The one that shifts in the direction of the arrow to mesh with the ring gear 30 is substantially only the pinion gear 11 and the pinion shaft 7 to which the pinion gear 11 is fixed. 6 is a stationary type that does not shift at all, and accordingly, the inertial weight of the shift member is obviously smaller than that of the conventional one, and the inertial force at the time of shifting is reduced accordingly, and as a result, The net switch 3 can be made smaller and lighter, and the impact at the time of gear engagement can be reduced, so that a smooth and reliable engine start can be performed.

Moreover, the engagement between the shift lever 14 and the pinion shaft 7 is
Since the bearing 15 is interposed between the pinion shaft 7 and the pinion shaft 7, the groove is formed on the pinion shaft side and the pinion shaft 7 is rotated at a high speed as in the case where the tip of the shift lever is engaged with the groove. The shift lever 14 and the pinion shaft 7 do not come into sliding contact with each other, and the bearing 15 can reliably absorb the rotation difference. As a result, the rotational force of the pinion shaft 7 is not reduced by the sliding resistance between the shift lever 14 and the pinion shaft, and the engine starting ability is not deteriorated. In this way, the bearing 15 for reducing the sliding resistance is provided, and the bearing 15 and the shift lever 1
4 is connected to the shift holder 7a, which is fitted on the bearing 15, and the shift holder 7a.
It is composed of a pair of clips 7c sandwiching the flange portions 7d formed in a and a flange portion 7d and engaging holes 7a and 7e formed in the clips 7c.
With a simple structure in which a is simply fitted, the number of parts is slightly increased, the assembly is easy, and there is no particular trouble.

Moreover, the base end portion of the pinion shaft 7 is supported by the clutch inner 6b of the stationary type one-way rotating clutch 6 via the helical spline fitting portion 8 as described above. This clutch inner 6b is supported by the helical spline. Since the portion corresponding to the fitting portion 8 is supported on the center bracket 10 side, the clutch inner 6 of the pinion shaft 7 is supported.
The support position by b coincides with the support position by the center bracket 10, and therefore the support of the base end portion of the pinion shaft 7 is ensured even if it is supported by the stationary unidirectional rotating clutch 6, and the pinion is ensured. The eccentricity of the shaft 7 can be prevented.

In addition, even when the clutch outer 6a of the one-way rotating clutch 6 is connected to the output shaft 5 by means of a serration, misalignment or blurring on the planetary reduction mechanism 4 side acts on the one-way rotating clutch 6 side. This is convenient because it has the advantage that it can be effectively avoided.

In order to reduce the inertial weight of the member that is shifted by the operation of the magnet switch, the second embodiment shown in FIGS. 4 and 5 can be used. This structure is basically the same as that of the first embodiment, but the support structure on the tip side of the pinion shaft 7 is different, and the common parts are the same as the first embodiment. Therefore, the description will be omitted, and the same number will be given to the drawing, and the leading end side support structure of the pinion shaft 7 will be mainly described below.

In other words, the base end of the pinion shaft 7 is supported by the clutch inner 6b of the stationary type one-way rotating clutch 6 as in the first embodiment.
A bearing 16 is integrally fixed to the tip of the. A cylindrical sliding body 17 is integrally fixed to the outer peripheral surface of the bearing 16. Further, on the inner circumference of the sliding body 17, a bullet 16a for receiving the bearing 16, a cylindrical body 19 whose inner peripheral surface is externally fitted to the stepped portion of the center bracket 10, and a retaining ring for supporting the cylindrical body 19 ( The clip 20 is assembled, but a stopper portion 19a is formed in a step shape on the outer periphery of the cylindrical body 19, and a holder portion 19b protruding from the stopper portion 19a is provided on the sliding body 17 with a shaft. The holder portion 19 protrudes from the guide groove 17a facing the core direction.
The engagement portion 14a of the shift lever 14 is fitted and engaged with the engagement hole 19c formed in b.

When the magnet switch 3 is turned on and the pinion shaft 7 shifts in the direction of the arrow and the pinion gear 11 meshes with the ring gear, the shift member includes the pinion gear 11, the bearing 16, the sliding body 17, and the tubular body. 19,
In this case, there are many members that shift as compared with those in the first embodiment, and there is a tendency for the weight to become slightly heavier. The inertial weight will be reduced.

In addition, since the bearing 16 also integrally shifts to the ring gear side at the time of shift, the two-point support structure of the pinion shaft 7 at the time of shift can be secured with a wider interval.
This also has the effect of preventing misalignment and blurring of the pinion shaft 7. Further, in this structure, a ring material having a substantially U-shaped cross section is interposed between the motor shaft 2a and the clutch inner 6b to center the clutch inner 6b.

[Advantages] In summary, since the present invention is configured as described in the first and second claims, the member that is shifted by the operation of the shift lever when the magnet switch is turned on is the pinion. The gear and the pinion shaft to which it is attached are about the same, and the conventional unidirectional rotating clutch does not shift together, the inertia weight of the shift member can be reduced, and the magnet switch is small and lightweight. It is possible to reduce the impact at the time of meshing the pinion gear with the ring gear, and it is possible to perform a smooth and reliable engine start. Moreover, this shifting pinion shaft is a stationary type one-way rotating clutch that is spline-fitted to the clutch inner so as to be movable in the axial direction, but the clutch inner matches the position corresponding to the spline fitting portion and the center bracket. Since the pinion shaft to be shifted is supported rotatably around the shaft center, the pinion gear has a reliable two-point support structure with the tip end on the pinion gear side and the base end on the clutch inner side to prevent misalignment and deviation. Can be lost,
It can be highly accurate.

Moreover, in the engagement structure with the shift lever formed between both bearing portions of the pinion shaft, since the bearing is interposed between the pinion shaft and the shift lever, the pinion shaft that rotates at a high speed and the shift lever that does not rotate rotate. The difference in rotation between the two is absorbed without impairing the smooth rotation force of the pinion shaft, as in the case where the shift lever is engaged in the groove formed in the conventional pinion shaft, both of them are absorbed. And high engine starting ability can be demonstrated.

Further, in the case where the connection relationship between the bearing fitted on the pinion shaft and the shift lever is set as in the first aspect,
It is composed of a pair of shift holders fitted on the bearings and a pair of clips sandwiching the flange portions formed on the shift holder, and the flange portion and the engaging holes formed in the clips are provided at the tip of the shift lever. The simple structure in which the engaging portions are simply fitted together has the advantages that the number of parts is slightly increased, the assembly is easy, and there is no particular trouble. On the other hand, in the case of the second aspect, since the bearing also shifts integrally and moves to the ring gear side during the shift, it is possible to secure a wider interval between the two-point support structure of the pinion shaft during the shift. Thus, it is convenient because the pinion shaft is further prevented from being misaligned and shaken.

[Brief description of drawings]

FIG. 1 shows an embodiment of a starter motor device according to the present invention. FIG. 1 is a side view showing a cross section of a main part of the starter motor device according to the first embodiment, and FIG. FIG. 3 is an exploded perspective view of a shift portion, FIG. 4 is a side view in which an essential portion of the starter motor device of the second embodiment is crossed, and FIG. 5 is an exploded perspective view of the shift portion. It is a figure. In the figure, 1 is a housing, 2a is a motor drive shaft, 3 is a magnet switch, 4 is a planetary speed reduction mechanism, 6 is a one-way rotating clutch, 6a is a clutch outer, 6b is a clutch inner, 7 is a pinion shaft, 7a is a shift holder, Reference numeral 8 is a helical spline fitting portion, 9 is a bearing, 10 is a center bracket, 11 is a pinion gear, 12 is a bearing, 13 is a bearing metal, 14 is a shift lever, and 15 is a bearing.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Hagiwara 1261 Hirosawa-machi, Kiryu-shi, Gunma Mitsuba Electric Manufacturing Co., Ltd. (56) Reference JP-A-56-47658 (JP, A) Patent 117353 (JP, C1)

Claims (2)

[Scope of utility model registration request] 1. A planetary speed reduction mechanism (4) in which a motor drive shaft (2a) serves as a sun gear, and power from the planetary speed reduction mechanism (4) is transmitted to a clutch outer (6a) to drive and rotate in a motor section. A one-way rotating clutch (6) set to transmit only power, and an inner circumference of the clutch inner (6b) of the one-way rotating clutch (6) concentric with the motor drive shaft (2a). A pinion gear (11) integrally fitted with a helical spline at its end and a pinion gear (11) integrally provided at its tip, and a portion near the pinion gear fastening portion on the tip side of the pinion shaft (7) Bearing means (12, 13) that supports the (1) so as to be movable in the axial direction and rotatable about the axial center, and the clutch inner (6b).
A bearing (9) for rotatably supporting the outer peripheral position facing the helical spline fitting part in the center bracket (10) around the axis, and a magnet switch (3) that operates by turning on the start switch. , A base end portion is connected to an operating rod (3a) of the magnet switch (3), and a front end portion of the pinion is provided between the front end side bearing means (12, 13) and the base end side bearing (9). A shift lever (14) engaged with the shaft (7), and the engagement between the shift lever (14) and the pinion shaft (7) is a bearing (15).
Are press-fitted into the pinion shaft (7), and a pair of shift holders (7a), which are arcuate and have flanges (7d) formed at both ends, are fitted onto the outer periphery of the bearing (15) from above and below, and the flanges are butted together. , The butted flanges are fitted to each other by a substantially U-shaped clip (7c) being externally fitted and sandwiched, and an engaging portion formed at the tip of the arc-shaped bifurcated end of the shift lever ( 14a) is fitted in the engaging holes (7b, 7e) formed in the collar portion (7d) and the clip (7c), and the shift lever and the pinion shaft are interposed via the bearing (15). A starter motor device characterized in that it is rotatably supported. 2. A planetary speed reduction mechanism (4) in which a motor drive shaft (2a) is a sun gear, and power from the planetary speed reduction mechanism (4) is transmitted to a clutch outer (6a), so that a drive rotation direction on the motor side. A one-way rotating clutch (6) set to transmit only power, and an inner circumference of the clutch inner (6b) of the one-way rotating clutch (6) concentric with the motor drive shaft (2a). To the housing (1) and a pinion shaft (7) integrally fitted with a pinion gear (11) at the tip and a portion near the pinion gear fastening part of the pinion shaft (7). A bearing (16) for rotatably supporting the shaft center and an outer peripheral position of the clutch inner (6b) facing the helical spline fitting part are rotatably supported by the center bracket (10) about the shaft center. Support A bearing (9) which operates by turning ON the starter switch mug Nets Sui Tutsi (3)
And a base end portion thereof is connected to an operating rod (3a) of the magnet switch (3), and a tip end portion of the pinion shaft () is provided between the tip end side bearing (16) and the base end side bearing (9). And a shift lever (14) engaging with (7), and a bearing (16) for integrally supporting the tip end side of the pinion shaft (7) on the housing (1) side about an axis. The outer periphery of the cylindrical sliding body (17) that is fitted internally in the housing (1)
On the other hand, the holder portion (19b) is formed so as to project from the cylindrical body (19) integrally fitted in the sliding body (17) while being supported slidably in the axial direction with respect to the holder portion (19).
b) is projected from a guide groove (17a) formed in the sliding body (17) and directed in the axial direction, and the tip end engaging portion (14a) of the shift lever (14) is attached to the protruding tip of the holder portion.
A starter motor device characterized in that: