JPH01224464A - Starter device - Google Patents

Abstract

PURPOSE:To have surely two-point supporting and prevent misalignment of a pinion shaft, which is installed coaxially with the shaft of a motor, by allowing a housing to support the tip of the pinion shaft through bearings, and by fitting the base end in a cylindrical output shaft supported by the housing. CONSTITUTION:When a key switch is pushed, a one-way rotational clutch 9 is moved ahead together with a pinion shaft 6, and a pinion gear 12 meshes with a ring gear 14. Now the drive force of a motor shaft 2a is transmitted to the pinion gear 12 via a planetary gearing speed reduction mechanism 4, a cylindrical output shaft 5, the one-way rotational clutch 9, and the pinion shaft 6 to cause the engine to start. The tip of the pinion shaft 6 where the pinion gear 12 is fixed, is borne by the housing 1 with bearings 11 interposed. The base end of the pinion shaft 6 is fitted in the cylindrical output shaft 5, which is supported by the housing 1 through a bearing 7, the output shaft 5, a bearing 7a, and a center bracket 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a starter device for starting an engine mounted on an automobile or the like.

[Prior art and problems to be solved by the invention]
Among these types of starter devices, there is one in which a motor shaft and a pinion shaft are arranged one after the other on the same axis to reduce the radial size of the starter housing, for example, as disclosed in Japanese Patent Laid-Open No. 198372/1983. Are known.

However, in this case, the output shaft of the motor power is lengthened by extending it to the pinion gear part, and a one-way rotation clutch is fitted on the outer periphery with a slidable spline, and the pinion shaft is supported via a bearing. and the pinion shaft is connected to the inner clutch of the one-way rotation clutch. For this reason, the extended tip of the output shaft is supported on the housing side via the pinion shaft,
As a result, when the pinion shaft is moved to engage the engine ring gear and reaches the starting position where it protrudes from the output shaft, the pinion shaft is only supported in a cantilevered manner relative to the housing. , therefore engine
.

When the engine is started, the load generated by the meshing of the pinion gear and ring gear causes the pinion shaft to become misaligned, resulting in a large runout of the pinion gear. Since it is supported only by bearings, it has disadvantages such as poor accuracy and low durability.

[Means for Solving the Problems] The present invention has been devised in view of the above-mentioned circumstances, with the aim of providing a starter device that can eliminate these drawbacks. The present invention provides a starter device in which a pinion shaft, which has a pinion gear fixed to its tip, and a motor shaft are disposed one after the other so that they are coaxial. The output shaft is rotatably supported on the housing side through the housing, and the tip of the output shaft supported on the housing side so as to be rotatable around the axis is made into a cylindrical shape in order to output the drive output of the motor shaft side. The pinion shaft is characterized in that the rear end of the pinion shaft is fitted into the cylindrical portion, and the pinion shaft is supported by the output shaft in a slidable helical spline fitting relationship.

Furthermore, as a second invention, in a starter device comprising a pinion shaft having a pinion gear fixed to the tip thereof and a motor shaft disposed one after the other so as to be coaxial, the pinion gear is fixed to the tip of the pinion shaft. The end of the output shaft is supported rotatably around its axis on the housing side via a bearing, while the tip of the output shaft, which is rotatably supported around its axis on the housing side, is cylindrical in order to provide drive output for the motor shaft side. The rear end of the pinion shaft is fitted into this cylindrical part, and the pinion shaft is supported on the output shaft by a helical spline fitting that allows the bearing to slide freely. An outer cylindrical portion into which the cylindrical portion is fitted is provided in a flange-like manner and is provided on the pinion shaft. It is configured as a one-way rotation clutch that transmits power when the motor rotates in the direction of movement, but cuts off power transmission when it rotates in the opposite direction. The rear end portion is characterized in that it is supported via a bearing in a cylindrical portion into which the rear end portion is fitted so as to be movable in the axial direction and rotatable around the axis.

In these inventions, the outer diameter of the bearing mounting portion on the tip side of the pinion shaft is smaller than the outer diameter of the pinion gear, and the pinion gear is integrally fixed to the pinion shaft by fitting coupling means such as serration coupling. In addition, the motor shaft and the output shaft may be coaxial, and the helical spline fitting portion may have some teeth that mesh with each other in the helical spline fitting portion. The front and rear parts of the pinion shaft can be communicated with each other to form a breather when the pinion shaft moves in the front and rear direction. Furthermore, the motor shaft and the output shaft may be separate bodies, and a planetary reduction mechanism may be interposed between the two in which the motor shaft is a sun gear and the output shaft is linked to a planetary gear. In this case, the support structure for supporting the output shaft on the housing side may be a center bracket supported by the housing so as to be rotatable about the axis via a bearing, and further, in this case, It is also possible to extend the motor shaft tip and fit it into the output shaft side cylindrical part so that the motor shaft tip can be supported by the output shaft via a bearing.

On the other hand, the second invention may be characterized in that a stopper is provided at the tip of the output shaft cylindrical portion that fits into the outer cylindrical portion to prevent the helical spline from coming off, and the one-way The clutch case that regulates the protrusion of the rollers and bullets that make up the rotating clutch is extended to the protruding flange-like part that makes up the clutch inner, thereby regulating misalignment in the axial direction of the one-way rotating clutch with respect to the pinion shaft. Further, the pinion shaft and the clutch inner may be integrally fixed by a fitting coupling means such as serration coupling, and furthermore, the rear end of the pinion shaft may be The bearing interposed between the part and the cylindrical part may be fixed to the cylindrical part side, and the fixed position overlaps the housing support position of the output shaft. The engagement portion of the shift lever formed in the outer cylinder portion may be formed in a clutch outer constituting a one-way rotation clutch.

In the present invention, when either of these configurations reaches the starting position, the pinion shaft is supported at two points to effectively eliminate misalignment.

[Embodiment] Next, an embodiment of the present invention will be described based on the drawings. In the drawings, 1 is the housing of the starter device.

A motor section 2 is disposed within the housing 1, and 3 is a magnetic switch. Reference numeral 4 denotes a speed reduction mechanism constructed using a planetary gear system, in which a motor sleeper shaft 2a is meshed with a planetary gear 4a as a sun gear. This planetary gear 4a revolves around itself while rotating based on the drive of the motor shaft 2a, but in the embodiment, the outer ring gear 4b is made of a synthetic resin material to reduce weight. A collar portion of the output shaft 5 is fixed to a support shaft 4d which is supported by the planetary gear 4a via a bearing metal 4c. The output shaft 5 is cylindrical,
A pinion shaft 6 is fitted here so as to be concentric with the motor shaft 2a. 7 is integrally fixed to the inner circumference of the output shaft 5,
A bearing metal into which the outer periphery of the pinion shaft 6 is slidably fitted;
Reference numeral 8 denotes a center bracket supported by the housing 1 to prevent the planetary gear 4a from coming off, and the center bracket 8 is rotatable around the outer peripheral surface of the output shaft 5 via the bearing metal 7a. I support it.

Moreover, the supported position by the bearing metal 7a and the fixed position of the bearing metal 7 overlap each other,
As will be described later, the pinion shaft 6 is supported on the housing 1 side via a bearing metal 7, an output shaft 5° bearing metal 7a, and a center bracket 8 regardless of its forward and backward movement.

A spline groove 5a is formed on the outer peripheral surface of the output shaft 5, and a one-way rotation clutch (to be described later) (which transmits power in the rotational direction of the motor section, but in the opposite direction) is formed in the helical spline groove 5a. Spline teeth 9 provided on the boss portion formed in the shape of a brim of the clutch outer 9a constituting the clutch outer 9a, which is set so as to cut off the electric power for rotation.
b are helically slidably engaged in the axial direction. In this embodiment, one of the convex teeth 9d of the spline teeth 9b is in a ``missing tooth'' state, and a breather (ventilation path) S is provided that connects the front and rear space chambers that sandwich the helical spline portion in a continuous manner. It consists of

On the other hand, the one-way rotation clutch 9 is formed in a flange-shaped portion 6a located on the forward side of the output shaft 5 and protruding from the pinion shaft 6. In other words, in this embodiment, the one-way rotation clutch 9 constitutes an outer cylindrical part that is integrally provided with the flange-like part 6a, and one end of the clutch inner 6b is connected to the flange-like part 6a. The output shaft 5 is integrally fixed by a serration coupling method, and the tip of the output shaft 5 is loosely fitted into a cylindrical groove formed between the inner peripheral surface of the clutch inner 6b and the outer peripheral surface of the pinion shaft 6. ing. Further, the clutch inner 6b is configured to serve as the clutch inner of the one-way rotation clutch 9. 9e is a clutch roller, and 9f is a clutch case provided to prevent the clutch roller 9e and the bullet (not shown) that urges it from jumping out and falling off.This clutch case 9f is extended to the side of the brim 6a. The one-way rotation clutch 9 is configured to come into contact with the pinion shaft 6, thereby restricting deviation of the one-way rotation clutch 9 from the pinion shaft 6 in the axial direction.

The tip of the pinion shaft 6 is rotatably supported by the housing 1 via a bearing 11, and a bearing metal 10 is integrally fixed to the inner side of the bearing 11.
The outer peripheral surface of the pinion shaft 6 is supported by the bearing metal 11 so as to be movable in the axial direction and rotatable around the shaft, and a pinion gear 12 is integrally provided on the tip side thereof. In other words, this pinion gear 12 is integrally fixed to the pinion shaft 6 by a fitting coupling method such as serration coupling, but in this case, the outer diameter of the gear fitting part at the tip of the pinion shaft is The diameter is set to be smaller than the outer diameter.

On the other hand, the tip of the shift lever 13, one end of which is attached to the operating shaft 3a of the magnetic switch 3, is engaged with the shift groove 9c provided in the clutch outer 9a, and when the key switch (not shown) is in the ruled state The operating shaft 3a
is in a protruding state, and as shown in FIG. 1, members such as the one-way rotation clutch 9 and pinion shaft 6 are recessed inside the housing 1, and the engagement of the pinion gear 12 with the ring gear 14 on the engine side is released. However, when the starter switch is operated to turn on the magnet switch 3 and swing the shift lever 13, the pinion gear 12 is moved to the one-way rotation clutch 9.
, is configured to project forward together with the pinion shaft 6 and reach a starting position where the pinion gear 12 meshes with the ring gear 14 and starts the engine. In this case, a stopper 1 for regulating the movement of the pinion shaft 6 is provided.
5 is provided at the tip of the output shaft 5. In other words, the stopper 15 is located inside the clutch inner 6b in the non-starting position, but when the stopper 15 is in the starting position, the stopper 15 is located inside the clutch outer 9b.
a, and further movement is restricted. Incidentally, this movement regulating operation is performed when the bearing 11 is
This can also be done by touching a. Further, a waterproof sealing material 16 is provided on the side surface of the pinion gear of the bearing 11 to prevent muddy water from entering the housing 1.

(Left below) When starting the engine as described above, when the key switch is operated, the magnetic switch is turned ON and the one-way clutch 9 is moved forward together with the pinion shaft 6, and the pinion gear 12 is moved to the ring gear 14. At the same time, the striking force from the motor shaft 2a is transmitted to the planetary reduction mechanism 4. Power is transmitted to the pinion gear 12 via the output shaft 5, one-way rotation clutch 9, and pinion shaft 6, thereby starting the engine.

As described above, the present invention relates to a starter that starts an engine, and the pinion shaft 6 is disposed coaxially with the motor shaft 2a, which makes it possible to reliably reduce the weight and size of the pinion shaft 6. The shaft 6 is supported by the housing 1 by a bearing 11 at the tip end to which the pinion gear 12 is fixed. A waterproof sealing material 16 is provided on the pinion gear 12 side of this bearing 11, which reliably prevents muddy water from entering the interior of the bearing 11. Therefore, advanced waterproofing measures are taken. However, the proximal end side is also supported by the housing 1 side. That is, the base end side of the pinion shaft 6 is fitted into the cylindrical output shaft 5, and this fitted output shaft 5 is connected to the housing via the bearing 7, the output shaft 5, the bearing 7a, and the center bracket 8. It is supported on one side, and has a two-point support structure at the front and rear. This two-point support structure is maintained as it is even when the starting position is reached. As a result, the pinion shaft 6 receives a reliable two-point support action even when starting the engine, and is not only capable of high-precision centering, but also due to the load generated by the meshing of the pinion gear and ring gear. Problems such as misalignment of the pinion shaft and increased runout of the pinion gear can be reliably prevented, resulting in excellent durability and greatly contributing to improved performance. Moreover, pinion shaft 6
In the embodiment, support on the proximal end side of the is provided via the center bracket 8, but for each bearing 7.7a provided in the support structure, the bearing 7 provided between the output shaft 5 and the pinion shaft 6 is fixed to the output shaft 5 side,
Even if the pinion shaft 6 moves forward or backward, its support position does not change, and since that position overlaps with the bearing 7a provided between the output shaft 5 and the center bracket 8, a reliable support action can be obtained. It turns out.

Moreover, in this case, the pinion shaft 6 is concentric with the motor shaft 2a, but in this case, the output shaft 5 is cylindrical,
The base end of the pinion shaft 6 is fitted into the inner cylinder so that the pinion shaft 6 and the output shaft 5 partially overlap, and this overlapping area is used to insert the bearing 7 between the pinion shafts 6 and 5. Therefore, the length of the starter device in the axial direction can be shortened and the device can be made more compact, and the support position on the base end side of the pinion shaft 6 can be reduced. This has the advantage of locating it as close to the end as possible.

Furthermore, in this case, the output shaft 5 is loosely fitted between the clutch inner 6a and the pinion shaft 6 so as to overlap the clutch inner 6b constituting the one-way rotation clutch 9. It has the advantage that the length in the axial direction can be shortened. Moreover, a stopper 15 for preventing the helical spline fitting that connects the output shaft 5 and the pinion shaft 6 in a freely movable relationship from coming out is arranged in the cylindrical groove formed between the pinion shaft 6 and the clutch inner 6b. Therefore, there is an advantage that it can contribute to further shortening the axial length. Furthermore, in this helical spline portion, the clutch outer 9a
One of the side convex teeth 9d is missing, and a breather S is formed between it and the bottom surface 5b of the corresponding incisor tooth on the output shaft 5 side. As a result, the pinion shaft 6 is connected to the one-way rotation clutch 9.
When moving together, air can smoothly enter and exit the cylindrical groove formed between the pinion shaft 6 and the clutch inner 6b by sandwiching the helical spline fitting portion, resulting in a so-called pumping phenomenon. This eliminates this and allows for effortless and smooth shifting. Of course, the breather S can be formed not only by notching the convex teeth 9d, but also by making deep cuts in the incisors.

In addition, in the one-way rotation clutch 9, the clutch inner 6b constituting the clutch inner is integrally fixed to the pinion shaft 6 by a connecting means such as serration fitting, so that the clutch inner 6b is free from deflection or runout of the pinion shaft 6. etc., this will be absorbed in the connecting part, and therefore, in the one-way rotation clutch 9, the misalignment between the clutch outer 9a and the clutch inner 6a will be reduced, and the operation of the one-way rotation clutch 9 will be ensured. This means that the durability can be improved. Especially clutch inner 6
It goes without saying that b may be formed integrally with the pinion shaft. Furthermore, in the one-way rotation clutch 9, the clutch case 9f restricts the rollers and bullets in the clutch from flying out, but this is further extended to the side of the flange 6a of the pinion shaft 6, Since the positional deviation of the directional rotation clutch 9 with respect to the pinion shaft 6 in the axial direction is restricted, there is no need for a special member for regulating it.
This reduces the number of parts and contributes to making it lighter and more compact.

In addition, this device uses the magnetic switch 3 to actively shift to the starting position, but in that case,
The shift lever 13 is engaged with a shift groove 9c formed in a clutch outer 9a of the one-way rotation clutch 9. Therefore, the clutch outer 9a can also be used as an engagement member for the shift lever 13, simplifying the structure, and there is no need to separately secure space for the shift lever engagement part in the axial direction, making the starter device lightweight and compact. This will also contribute to the development of

Further, in the pinion shaft 6, the outer diameter of the fastening part of the pinion gear 12 is smaller than the outer diameter of the pinion gear 12, and the pinion gear 12 is assembled here by fastening means such as serration coupling. Therefore, the outer diameter of the mounting part of the bearing 11 on the pinion shaft 6 can be set regardless of the outer diameter of the pinion gear 12. Therefore, the degree of freedom in design is expanded, and the starter device can be made smaller and lighter. will also be able to contribute. Further, the bearing 11
Since the bearing metal 10 is fixed to the inner part of the pinion shaft 6 to support the pinion shaft 6, the movement of the pinion shaft 6 in the axial direction is smooth, and the load from the ring gear 14 side is not affected. It has the advantage of being able to improve durability, stability, and durability.

It should be noted that the present invention is of course not limited to the above-mentioned embodiments, and may be applied to a motor shaft and an output shaft that are integrated without the reduction mechanism 4, or when starting an engine.
The pinion shaft 6 may not be actively shifted by the magnetic switch 3, but may be shifted by receiving the centrifugal force caused by the rotation of the output shaft 5.
Furthermore, one without the one-way rotation clutch 9 may be used. In this case, in order to protect the starter device, it is necessary to provide a mechanism for cutting off high-speed drive from the engine in the transmission mechanism from the engine gear 14 to the engine.

゛Additionally, the center bracket 8 is used to support the output shaft.
Instead, it may be directly supported by the housing 1 via a bearing. When the transmission system from the output shaft 5 to the pinion shaft 6 does not have a one-way rotation clutch 9, the one-way rotation clutch 9 supports the pinion shaft 6 fitted inside the output shaft supported on the housing side. Since there is no misalignment between the inner and outer parts, a freely movable helical spline fitting part is provided between the inner cylindrical part of the output shaft 5 and the outer peripheral surface of the pinion shaft 6 that fits therein. The pinion shaft 6 may be supported on the output shaft 5 by a helical spline fitting portion, or a bearing may be provided between the output shaft inner cylindrical surface and the pinion shaft outer circumferential surface at a location separate from the helical spline fitting portion. It is also possible to provide support.

Further, the tip of the motor shaft 2a can also be supported via the output shaft 5. In other words, the second
If the motor shaft 2a is extended and fitted into the cylinder of the output shaft 5 as in the embodiment and is supported by the output shaft 5 via the bearing metal 17, the centering of the motor shaft 2a can be performed with high accuracy. As a result, when the planetary reduction mechanism 4 is provided, the centering of the motor shaft 2a, which becomes the sun gear, and the planetary gear 4a can be performed with high precision, and the load on the bearings can be reduced even at the full rotational speed of the output shaft 5. Since the amount of heat is reduced, the planetary speed reduction mechanism 4 can be protected and its durability can be improved.

[Operations and Effects] In summary, the present invention provides a starter device in which a pinion shaft having a pinion gear fixed to the tip thereof and a motor shaft are disposed one after the other so as to be coaxial. The end of the output shaft is supported rotatably around the axis on the housing side through a bearing, while the end of the output shaft is supported rotatably around the axis on the housing side in order to output the drive output on the motor shaft side. is shaped like a cylinder, and the rear end of the pinion shaft is fitted inside the cylinder, and the pinion shaft is supported on the output shaft in a movable helical spline fitting relationship. Moreover, in this product, the pinion shaft is provided with a protruding outer cylindrical portion into which the cylindrical portion of the output shaft is fitted, and the outer cylindrical portion provided on the pinion shaft is provided with an output side cylindrical portion. Using a clutch outer that is fitted with a helical spline to the pinion shaft and a clutch inner that is integrally provided to the brim of the pinion shaft, power is transmitted for rotation in the driving direction of the motor, but for rotation in the opposite direction. The pinion shaft is configured as a one-way rotating clutch that cuts off power transmission, and furthermore, the rear end of the pinion shaft is movable in the axial direction and rotatable around the axis via a bearing in a cylindrical part into which the rear end is fitted. The pinion shaft is supported by a flange-like outer cylindrical part into which the cylindrical part of the output shaft is fitted, so the pinion shaft is arranged coaxially with the motor shaft. However, the tip of the pinion shaft is supported by the housing by a bearing, and the rear end is supported by fitting inside the cylindrical output shaft, and as a result, the pinion shaft receives support from two points at the front and rear. The shaft is supported in a centered state with high precision, and even if it is subjected to the load generated by the meshing of the pinion gear and ring gear when the engine starts, it will be maintained in the centered state by receiving a reliable two-point support action. As a result, it is possible to reliably prevent problems that occur in the past, such as misalignment of the pinion shaft and increased runout of the pinion gear, resulting in excellent durability and greatly contributing to improved performance.

Regarding this outer cylindrical portion, a clutch outer that is helically spline-fitted to the output side cylindrical portion and a clutch inner that is integrally provided to the pinion shaft are used to transmit power for rotation in the driving direction of the motor portion. , it is constructed as a one-way rotation clutch that cuts off power transmission when rotating in the opposite direction.

The installation of a one-way rotation clutch saves space and can be overlapped with the helical spline fitting part, contributing to a reduction in size and weight. If the helical spline fitting part and the bearing support part are supported by a bearing so that they can move freely in the axial direction and can rotate around the shaft axis, the helical spline fitting part and the bearing support part can be assembled in an overlapping state, and the bearing support part can be assembled in an overlapping state. , the length in the axial direction can be shortened, contributing to the reduction in size and weight of the starter device.

In addition, in these products, the outer diameter of the bearing mounting part on the tip side of the pinion shaft is smaller than the outer diameter of the pinion gear, and the pinion gear is integrally fixed to the pinion shaft by a fitting coupling means such as serration coupling. If this is done, the outer diameter of the bearing mounting part on the pinion shaft can be set regardless of the outer diameter of the pinion gear, which expands the degree of freedom in design and contributes to reducing the size and weight of the starter device. become. Furthermore, by making the motor shaft and the output shaft coaxial, it is possible to contribute to making the starter device smaller and lighter.

In addition, if some of the teeth that mesh with each other in the helical spline fitting part are missing and the front and rear parts of the helical spline fitting part are connected to form a breather when the pinion shaft moves forward and backward, the pinion shaft This is advantageous in that the air flows smoothly when the gear shifts along the helical spline, and the so-called bumping phenomenon can be prevented from occurring.

Furthermore, the motor shaft and output shaft are separate, and there is a
If the motor shaft is a sun gear and the output shaft is equipped with a planetary reduction mechanism connected to a planetary gear, the structure can be effectively simplified, but in this case, the structure can be effectively simplified. The support structure has the advantage that a dedicated bearing member is not required if the center bracket supported by the housing is rotatably supported around the axis via a bearing. Furthermore, by extending the tip of the motor shaft and fitting it into the cylindrical part on the output shaft side, and supporting the tip of the motor shaft on the output shaft via a bearing, the centering of the motor shaft, which serves as a sun gear, can be done accurately. At the same time, the load on the bearing is also reduced depending on the rotational speed variation of the output shaft, which has the advantage of protecting the planetary reduction mechanism and improving durability.

On the other hand, if a stopper for preventing the helical spline fitting from coming off is provided at the tip of the output shaft cylindrical part that fits inside the outer cylinder part, so that the helical spline fitting is prevented from coming off;
Accordingly, there is no need to separately secure a space for providing this, which contributes to reduction in size and weight.

Then, the rollers that make up the one-way rotation clutch and the clutch case that restricts the protrusion of the bullets are extended to the protruding flange-like part that makes up the clutch inner, and the one-way rotation clutch is aligned in the axial direction with respect to the pinion shaft. If the clutch case is regulated, it has the advantage that the clutch case can also be used as a deviance regulating body, allowing effective use of parts and a reduction in the number of parts. Moreover, in a one-way rotation clutch,
If the flange of the pinion shaft and the clutch inner are integrally fixed by means of a fitting connection such as serration connection, the pinion shaft may deflect or run out.

This will be absorbed at this connection.

Therefore, in the one-way rotation clutch, misalignment between the clutch outer and the clutch inner is reduced, and the operation of the one-way rotation clutch is ensured, resulting in improved durability.

Moreover, if the bearing interposed between the rear end of the pinion shaft and the cylindrical part is fixed to the cylindrical part side, and its fixed position overlaps the housing support position of the output shaft,
When the pinion shaft is shifted to start the engine, the two-point support position of the pinion shaft is maintained, making it possible to maintain centering accuracy.

If the clutch outer of the one-way rotation clutch is formed with the engagement part of the shift lever formed on the pinion shaft outer cylinder, the clutch outer can be used effectively, and at the same time, there is no need to secure space for it. Furthermore, it can contribute to making the starter device smaller and lighter.

[Brief explanation of the drawing]

The drawings show an embodiment of the starter device according to the present invention, and FIG. 1 is a partially sectional front view of the starter device;
FIG. 2 is a front view of the main part showing a shifted case, FIG. 3 is a cross-sectional view of the helical spline part, and FIG. 4 is a front cross-sectional view of the main part of the starter device showing the other side. In the figure, 1 is a housing, 2 is a motor part, 2a is a motor shaft, 3 is a magnetic switch, 4 is a planetary reduction mechanism, 4a is a planetary gear, 5 is an output shaft, 6 is a pinion shaft, 6a is a flange part, 7 .7a is the bearing metal, 8゛ is the center bracket,
9 is a one-way rotation clutch, 9a is a clutch outer, 9f
is the clutch case, 11 is the bearing, 12 is the pinion gear,
13 is a shift lever, and 114 is a ring gear.

Claims (1)

[Claims] 1) In a starter device in which a pinion shaft having a pinion gear fixed to the tip thereof and a motor shaft are disposed one after the other so as to be coaxial, the pinion gear is fixed to the tip of the pinion shaft. The end of the output shaft is supported rotatably around its axis on the housing side via a bearing, while the tip of the output shaft, which is rotatably supported around its axis on the housing side, is cylindrical in order to provide drive output for the motor shaft side. A starter device characterized in that a rear end portion of a pinion shaft is fitted into the cylindrical portion, and the pinion shaft is supported by the output shaft in a slidable helical spline fitting relationship. 2) In a starter device in which a pinion shaft with a pinion gear fixed to the tip thereof and a motor shaft are disposed one behind the other so as to be coaxial, the pinion gear fixed side of the tip of the pinion shaft is connected via a bearing. The output shaft is supported on the housing side so as to be rotatable around the axis, and the tip of the output shaft, which is supported on the housing side so as to be rotatable around the axis, is cylindrical in order to output the drive output for the motor shaft side. The rear end of the pinion shaft is fitted internally into the pinion shaft, and the pinion shaft is supported on the output shaft in a relationship having a helical spline fitting that allows the bearing to slide freely. The outer cylinder part is provided in a flange-like manner and is provided on the pinion shaft. The clutch inner is configured as a one-way rotating clutch that transmits power when the motor rotates in the drive direction, but cuts off power transmission when the motor rotates in the opposite direction.Furthermore, the rear end of the pinion shaft 1. A starter device characterized in that a cylindrical portion into which the portion is fitted is supported via a bearing so as to be movable in an axial direction and rotatable around an axial center. 3) In the first or second aspect, the outer diameter of the bearing mounting portion on the tip side of the pinion shaft is smaller than the outer diameter of the pinion gear, and the pinion gear is connected to the pinion shaft by fitting coupling means such as serration coupling. A starter device characterized by being integrally fixed with. 4) The starter device according to claim 1 or 2, wherein the motor shaft and the output shaft are coaxial. 5) A breather according to the first or second claim, in which a part of the mutually meshing teeth of the helical spline fitting part are missing, and the front and rear of the helical spline fitting part are communicated with each other so that the pinion shaft moves in the front-rear direction. A starter device characterized by comprising: 6) In the first or second claim, the motor shaft and the output shaft are separate bodies, and a planetary reduction mechanism in which the motor shaft is a sun gear and the output shaft is connected to a planetary gear is interposed between them. A starter device characterized by: 7) In the sixth aspect, the support structure for supporting the output shaft toward the housing is supported by a center bracket supported by the housing so as to be rotatable about its axis via a bearing. Starter device. 8) In the sixth or seventh aspect, the tip of the motor shaft is extended and fitted into the cylindrical portion on the output shaft side, and the tip of the motor shaft is supported by the output shaft via a bearing. starter device. 9) The starter device according to claim 2, characterized in that a stopper for preventing the helical spline fitting from coming off is provided at the tip of the output shaft cylindrical portion that fits inside the outer cylindrical portion. 10) In the second aspect, the roller constituting the one-way rotation clutch and the clutch case that restricts the protrusion of the bullet are extended to a flange-like portion that protrudes to constitute the clutch inner, and the one-way rotation clutch is rotated in one direction with respect to the pinion shaft. A starter device characterized by regulating deviation in the axial direction of a rotary clutch. 11) The starter device according to claim 2, wherein the pinion shaft and the clutch inner are integrally fixed by a fitting coupling means such as a serration coupling. 12) In the second aspect, the bearing interposed between the rear end of the pinion shaft and the cylindrical part is fixed to the cylindrical part,
A starter device characterized in that the fixing position overlaps the housing support position of the output shaft. 13) The starter device according to claim 10, wherein the engagement portion of the shift lever formed on the pinion shaft outer cylinder portion is formed on a clutch outer constituting a one-way rotation clutch.