JPS5915672A - Starter - Google Patents

Abstract

PURPOSE:To reduce the number of parts and improve the easiness of assembly, by dividing the driven part of a one-way clutch into at least 2 parts. CONSTITUTION:The one end of an approximately cylindrical clutch inner 3b, serving as a driven part and having stages on the inner and the outer peripheral surface, is inserted into the inside of a clutch 5, and the clutch inner 3b is rotatably and also axially slidably fitted around a rotary shaft 2 through the medium of a bearing 7. A pinion gear 6 is axially slidably fitted around a small size part, positioned on opposite side of a large size part side brought into slide contact with a one-way clutch 5, of the clutch inner 3b, through the medium of a second helical spline 4b having the same spiral direction as that of a first helical spline 4a. Division of the driven part of the one-way clutch device into two parts of the clutch inner 3b and the pinion gear 6 can facilitate manufacture of those parts.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a starting device for an internal combustion engine such as an automobile or a motorcycle.

2. Description of the Related Art As a device for starting an internal combustion engine of a motorcycle or the like, a starting device called a so-called Pendix type or an inertial sliding type is well known. This starting device is constructed as shown in FIG. In Fig. 1, a clutch outer 3, which is a driving part of a one-way clutch device, is carved on the mating surface of a rotating shaft 2 to which a driven gear 1 that receives power from a starting motor (not shown) is attached. It is slidably extrapolated in the axial direction via a helical spline 4. A pinion gear 6, which is a driven part of the one-way clutch 5, is externally inserted onto the rotating shaft 2 via a bearing 7, and a coil spring 8 has one end attached to the end face of the pinion gear 6 in a cylindrical shape. The spring cover 9 is inserted into contact with the inside of the spring cover 9 via the bent tip. The spring cover 9 includes a large-diameter cover 98 and a small-diameter cover 9 that is approximately bowl-shaped and whose diameter is smaller by approximately the wall thickness.
b are joined to each other so as to be slidable in the axial direction, so that the axial length can be freely expanded and contracted. The small diameter cover 9b is fitted over the rotating shaft 2 and fixed by a stopper 10 so as not to move in the axial direction. Moreover, the clutch outer 3
On the outside of the narrowed part, there is a governor weight 11a, which is shaped like a disc roughly divided into three radial parts, and a weight holder 11b which is fixed to the clutch outer 3 and branches into three radial parts.
A centrifugal force governor device 11, which is uniformly supported by the annular spring 11C and integrally fixed by being tightened from the outside by the elastic force of the annular spring 11C, is externally inserted.

Further, on the outside thereof, a weight guide 12 having a substantially bowl shape with a step in the A section is inserted onto the rotating shaft 2 in such a manner that the centrifugal force governor device 11 and a part of the clutch outer 3 are accommodated therein. and is fixed with a C-shaped retaining ring 13.

The tooth portion 6a of the pinion gear 6 is formed to protrude from the other outer circumferential surface in order to slide in the axial direction and mesh appropriately with the ring gear 14. For this reason, it becomes difficult to attach the clutch cover 5a that protects the one-sided clutch mechanism, which is elaborately constructed with an appropriate number of rollers, springs, etc.
As shown in FIG. 1, the diameter of the insertion hole of the approximately bowl-shaped clutch cover 58 is formed to be large, and after first covering the clutch mechanism with small parts such as the flat washer 5C and the half washer 5b, the large-diameter insertion hole is formed. It was necessary to construct a structure in which the clutch cover 58 in which the hole was formed was inserted and assembled. As mentioned above, the inertial sliding type starter includes the centrifugal governor device 1 in addition to the main parts such as the clutch outer 3 and the pinion gear 6.
1 and a stopper section consisting of a return coil spring 8, etc., are elaborately assembled, and the number of parts is inevitably large, requiring a large number of assembly man-hours. Therefore, keeping the number of parts to the minimum necessary and creating a configuration that is convenient for assembly has been an important issue in terms of cost reduction measures for starter devices. From the above point of view, it was necessary to avoid as much as possible the increase in the number of parts related to the clutch cover 12 and the complication of assembly work, which would have the opposite effect on the above theme. Furthermore, the uneven shape of the pinion gear 6 increases the number of manufacturing steps and deteriorates the material yield, which is a major factor in increasing the cost.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a starter device that reduces the number of parts, improves assembly work efficiency, and enables precise reduction of cost. The first invention in this application is characterized by:
A driving member of a one-way clutch mechanism is slidably fitted onto the rotating shaft rotated by the starter motor via a helical spline, and is removably connected to the driving member via a one-way latch. In the starting device for an internal combustion engine, a driven member having a pinion gear formed on its outer circumferential surface that meshes with a ring gear of the engine so as to be freely engaged with and detachable from the ring gear is rotatably inserted onto the rotating shaft and slidably in the axial direction. The driven member is divided into at least two parts: a support member that is fitted over the rotating shaft, and a pinion gear that is fitted onto the support member. Further, the second invention is characterized in that the driving member of the one-sided clutch mechanism is slidably fitted onto the rotating shaft rotated by the starting motor via a helical spline, and the driving member and the one-sided clutch are connected to each other via a helical spline. A driven member is rotatably connected to the rotary shaft and has a pinion gear formed on its outer circumferential surface that is removably connected to the ring gear of the internal combustion engine and that engages with the ring gear of the internal combustion engine so as to be able to move in and out of the rotary shaft. The pinion gear is inserted into the driven member with one end in contact with the driven member, and the pinion gear is connected to the driven member from the ring gear.
1. In the starting device for an internal combustion engine, in which a biasing means for biasing in the direction of disengagement is fitted onto the rotating shaft, the biasing means is installed between the driven member and the rotating shaft. be.

Next, regarding a specific example of the starting device according to the present invention,
The explanation will be based on the attached drawings. FIG. 2 is a cross-sectional view of the upper half of the motorcycle starting device according to the present invention. Incidentally, parts that are the same as those in the conventional embodiment shown in FIG. 1 are designated by the same reference numerals.

In FIG. 2, a driven gear 1 that receives rotation of a starting motor (not shown) is mounted on the 1DN side of a rotating shaft 2. As shown in FIG. The other end of the rotating shaft 2 is slidably inserted in the axial direction via a first helical spline 4a formed with a clutch outer 3ah<fM meeting surface, which constitutes a drive unit for mounting a one-way clutch. There is. This clutch outer 3
A has a roughly bowl-shaped outer shape with two stages, and a centrifugal force governor device 11 consisting of a governor way mill 11a, a weight holder 11b, and an annular spring 110 is attached to the outer peripheral surface of the small diameter portion. . Centrifugal force governor device 11
1 is a weight holder 11b in which three governor weights 11a each having a shape obtained by radially dividing a disc into approximately three parts are fixedly attached to a clutch outer 3 and are evenly branched into three prongs in a radial direction.
The clutch outer 3a rotates integrally with the clutch outer 3a, and is fixed integrally with the annular spring 11C that is wound from the outside. The three governor weights 11a each move in the axial radial direction due to the force, and the three governor weights 11a expand the outer diameter defined by the governor weights 11a. A weight guide 12 having a substantially bowl shape with a step formed in the A portion accommodates and covers the centrifugal force governor device 11 and a part of the small diameter portion of the clutch outer 3a therein. 2 and fixed with a C-shaped retaining ring 13.

Inside the bowl-shaped large diameter portion of the clutch outer 3a,
A spring (not shown) along the inner circumferential surface (not shown)
A one-way clutch 5 is installed, which is constructed by combining the two, and transmits rotation only in one direction. Furthermore, one end of a substantially cylindrical clutch inner 3b having a step on the inner and outer circumferential surfaces, which becomes a driven part, is inserted inside the clutch inner 3b, and this clutch inner 3b is rotatable on the rotating shaft 2 via a bearing 7. It is also extrapolated so that it can slide freely in the axial direction. A clutch cover 58 having a substantially bowl shape is fitted over the clutch inner 3b in such a manner as to hug the edge of the large diameter portion of the clutch outer 3a, which also has a bowl shape. This clutch cover 58 is fixed to the outer surface of the clutch outer 3a by caulking the side portion from the outside with a strong force.
Insert the clutch inner 3 into an insertion hole with a diameter approximately equal to the outer diameter of the small diameter portion of the clutch inner 3b to be inserted, which is bored in the center of the bottom surface.
The small diameter portion b is inserted through it almost without any gap.

Therefore, the clutch cover 5a not only covers the one-way clutch 5 housed inside, but also has the function of restraining the clutch outer 3a and the clutch inner 3b so that they do not shift in the axial direction. As shown in the figure, accessory parts such as the flat washer 5C and the half washer 5b can be omitted.

A pinion gear 6 is connected to the small diameter portion of the clutch inner 3b on the opposite side to the large diameter portion that interfaces with the one-way clutch 5 in the axial direction via a second helical spline 4b having the same helical direction as the first helical spline 4a. is extrapolated to allow inertial sliding. A toothed portion 6a is provided on the outer circumferential surface of the pinion gear 6 so as to be able to properly mesh with the engine drive ring gear 14 protruding nearby when the pinion gear 6 is inertially slid in the direction of the arrow. It has become.

As described above, by dividing the driven part of the one-way clutch device into two parts, the clutch inner 3b and the pinion gear 6, these parts can be manufactured easily, the material yield is improved, and the cost of parts is reduced. Moreover, this makes it possible to easily incorporate the latch cover 58, which is useful because the insertion hole described above is made smaller than in the case of the prior art, which contributes to a reduction in the number of parts. That is, before fitting the pinion gear 6 to the clutch inner 3b, the clutch cover 58 may be externally inserted, and then the pinion gear 6 may be fitted with a helical spline to the clutch inner 3b. Therefore, the protruding tooth portion 6a of the pinion gear 6 does not become an obstacle, and the aforementioned useful latch cover 5
8 can be incorporated. In addition, a shock absorbing member such as a disc spring can be easily installed in the space E between the pinion gear 6 and the clutch cover 58, and it is possible to alleviate the severe impact force peculiar to a starting device that bounces back.

The inner peripheral surface of the center hole through which the rotating shaft 2 of the clutch inner 31) is inserted is also formed in a two-step shape, and the inner diameter of the end opposite to the side in contact with the one-way clutch 5 is A space B is formed which is secured larger than the others. In this space B, one of the coil springs 8 extrapolated to the rotating shaft 2 is provided.
The DN side places the suppression plate 8a provided at the end on the stepped surface C.
It is accommodated in abutment. The other end of the coil spring 8 is housed inside an arm of a spring cover 9 which has an elongated substantially bowl shape and is fitted onto the rotating shaft 2, and its end is brought into contact with the bottom of the bowl of the spring cover 9. . The spring cover 9 is fixed by a stopper 10 so as not to move in the axial direction. Therefore, the clutch inner 3b is
The elastic force of the coil spring 8 always biases the clutch outer 3a. The stopper 10, which has a disk shape and is fitted onto the rotating shaft 2, functions as a stopper for the clutch inner 3b and the pinion gear 6, which are slid by inertia. By configuring the stopper portion as described above, the spring cover 9 can be configured into a single piece compared to the prior art, which reduces the number of parts and facilitates assembly.

The operation of the above-described embodiment configured as described above will be explained below. In FIG. 2, a starter motor (not shown) is turned on and begins to rotate, the rotation is transmitted to the driven gear 1, and the rotating shaft 2 on which the driven gear 1 is mounted begins to rotate at a high speed. When the rotating shaft 2 starts rotating, an inertial sliding force in the direction of the arrow in the figure acts on the clutch outer 3a, which is fitted onto the rotating shaft 2 via the first helical spline 4a, due to the effect of the first helical spline 4a. do. As a result, the centrifugal force governor device 11° one-way clutch 5 integrally assembled to the clutch outer 3a
．． The clutch inner 3b and the sliding parts such as the pinion gear 6 which are helically spline-fitted to the clutch inner 3b resist the elastic force of the coil spring 8 that comes into contact with the step surface C of the clutch inner 3b, and absorb the inertial sliding force. moves integrally in the axial direction indicated by the arrow. Then, the tip of the clutch inch 3b comes into contact with the stopper 10, and the above-mentioned inertial sliding is stopped. At this point, the pinion gear 176 has already engaged with the ring gear 14 with most of its teeth 5a' jumping into the teeth of the ring gear 14. Immediately after the inertial sliding is stopped, rotation starts integrally, causing the ring gear 14 to rotate.

At this time, the centrifugal force governor device 11 attached to the outer peripheral surface of the clutch outer 3a rotates integrally with the clutch outer 3a, and the three governors 11a each rotate as follows.
A mode in which it moves radially as if floating against the elastic tightening force of the spring 11c wound on the outside due to centrifugal force, and comes into contact with the inner circumferential surface of the large diameter portion beyond the step Δ of the way 1 to guide 12. It becomes. Therefore, by the time the pinion gear 6 engages and rotates the ring gear 14, starting and igniting the engine of the motorcycle and stably driving it, the engine speed decreases and the pinion gear 6 is inadvertently exposed to MIIR from the ring gear 14. Also, this enlarged governor weight 11a is locked to the step A to prevent it from coming off.

When the ring gear 14 receives the rotational drive of the starter of the present invention without interruption as described above, and the rotational speed of the engine increases to reach stable driving, the pinion gear 6 is forced to rotate by the ring gear 14. A so-called overrun state occurs. At this time, clutch inch 3
b, due to the effect of the second helical spline 4b,
A sliding force is newly applied to the driven gear 1 side in the direction of the arrow in FIG. 3. Further, the clutch inch 3t) is separated from the clutch outer 38mQ due to the effect of the one-way clutch, and starts rotating freely at high speed. However, since the clutch outer 3a also gradually increases its rotational speed due to the drag torque of the one-way clutch 5, the first helical spline 4a functions, and this clutch outer 3a has inertia in the side direction of the weight guide 12 as shown by the arrow. Sliding force acts. Therefore, the integral sliding portion from the clutch outer 3a to the clutch inner 3b, which is sandwiched between the first helical spline 4a and the second helical spline 4b, has two types of inertial sliding forces in opposite directions and the elasticity of the coil spring 8. Since the resultant force that cancels out the forces causes the weight to be pressed toward the weight guide 12 side, the weight is pushed toward the weight guide 12 side. Step A of guide 12
The load applied to the weight guide 12 is reduced, and wear of the weight guide 12 is suppressed.

Eventually, when the engine reaches a predetermined rotational speed and starts stable driving, the starter motor (not shown) is turned off. When the starting motor is turned off and the rotating shaft 2 stops rotating, the clutch outer 3 fitted with a helical spline
A is also separated from the latch 5 in one direction and stops. When the rotation of the clutch outer 3a stops, the inertial sliding force that causes the clutch outer 3a to slide toward the weight guide 12 due to the effect of the first helical spline 4a is 1? The force increases rapidly, and acts on the clutch outer 3a as a large urging force. At the same time, the centrifugal force governor device 11 attached to the clutch outer 3a also stops rotating, so the centrifugal force that had been acting until then disappears, and the expanding governor weight 1ia is elastically tightened by the spring 11c. The applied force returns to the original outer circumference of the clutch outer 3a, reduces its diameter, and releases its stopper function. Therefore, as soon as the stopper function of this centrifugal governor device [11 is released, the first
This is because a stronger combined force of the strong inertial sliding force due to the effect of the helical spline 4a and the elastic force of the coil spring 8 acts instantaneously on the integral sliding portion from the clutch outer 3a to the pinion gear 6. The parts are almost integrally kicked back to the original position before starting, and the teeth 6a of the pinion gear 6 are separated from the ring gear 14. At this time, the clutch outer 3a is the weight guide 1.
It collides with 2 and applies a strong impact to it. However, in this embodiment, the inertial sliding force acting in the direction of the driven gear 11!1 due to the effect of the second helical spline 4b acts on the clutch inner 3b until the moment the pinion gear 6 separates from the ring gear 14. The impact force when the sliding portion is kicked back is significantly reduced compared to the case where the sliding portion is kicked back.

In this embodiment, a second helical spline having the same helical direction as the first helical spline provided between the drive part and the rotating shaft is provided on the dividing surface of the driven part of the one-way latch device divided into two according to the present invention. A helical spline is provided to reduce the impact force when kicking back. However, the helical direction of the second helical spline carved on this dividing surface may be opposite to that of the first helical spline. In this case, the pinion gear and ring gear are affected by the impact force when the pinion gear meshes with the gear, during high load driving, during the cranking peak when starting the engine, and during so-called "ketching" when the pinion gear rotates in reverse. It has the effect of alleviating the impact force generated between the tooth surfaces. Also, although it becomes impossible to slide in the axial direction,
Of course, it is also possible to use a structure in which ordinary screws are installed or screwed into the dividing surface. In both of the above two modified embodiments, by appropriately cutting the driven part by two, not only can the reduction in the number of parts which is the objective of the present invention be achieved, but also the impact of a suitable disc spring etc. can be achieved as described above. It is also possible to easily incorporate a buffer member to reduce the impact when kicking back.

Furthermore, since the starting device of the above embodiment was configured to draw the pinion gear on the output side toward the starting input side, the clutch outer became the driving side with respect to the one-sided clutch, and the driven side was divided into the clutch inner and the pinion gear. . However, the divided parts are not limited to the above embodiment, and in a starter device in which the pinion gear on the output side is pushed out from the input side, the clutch inch is on the driving side, so the driven side is different from the one-way clutch. The configuration may be such that the clutch outer is separated from the pinion gear.

As detailed above, according to the present invention, by dividing the driven part of the one-way clutch into at least two parts, the number of parts is reduced and assembly efficiency is improved, and the manufacturing of each part is facilitated, resulting in a reduction in material yield. will improve.

Therefore, it is possible to promote precise cost reduction of the starting device.

Further, by providing a biasing means in the space formed between the driven part and the rotating shaft, the number of parts can be reduced and ease of assembly can be improved. Furthermore, by dividing the driven part, it becomes possible to install a helical spline on the divided surface and appropriately incorporate a shock absorbing member, and when the pinion gear A7, which is unique to the starter, engages, the 15-engine drive It is also possible to improve its durability by alleviating the impact during initial sketching, cranking beak, etc., and the impact during kickback. It should be noted that the present invention should not be limited to the specific embodiments described above, and it goes without saying that various modifications can be made within the technical scope of the present invention. For example, it is also possible to configure the driven part of the one-way clutch device to be divided into three or more parts.

[Brief explanation of the drawing]

Fig. 1 shows a conventional starting device for a motorcycle, a sectional view taken in half, and Fig. 2 a sectional view taken in the upper half of the starting device for a motorcycle according to the present invention, showing the state before starting. FIG. 3 is a cross-sectional view, cut away from the upper half, showing a driving state in which the binion gear of the starter is meshed with the mating ring gear. (Explanation of symbols) 3.3a: Clutch outer 3b: Clutch inch 4b: Second helical spline 6: Pinion gear 6a: Teeth Patent applicant Mitsuka Denki Seisakusho Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 30 Procedure amendment Type: October 7, 1980 Director-General of the Japan Patent Office Kazuo Wakasugi 1, Indication of the case: 1981 Patent Application No. 123
768 @2, Title of invention Starting system
3. Relationship with the case of the person making the amendment Patent applicant address: 1-2681 Hirosawa-cho, Kiryu City, Gunma Prefecture Name
Mitsuka Denki Seisakusho Co., Ltd.4, Agent5, Date of amendment order Voluntary6, Number of inventions increased by amendment None.
Correct Content 1. In the specification of the present application, the entire statement in the column of Claims J is amended as follows. In the device, a drive member is slidably inserted onto a rotating shaft rotated by the starting motor via a helical spline and is removably connected to the one-way clutch, and the drive member and the one-way clutch are connected to each other. a support member that is removably connected to the rotary shaft and is rotatably and slidably inserted in the rotating shaft; and a driven member having a pinion gear, and a biasing means installed between the support member and the rotating shaft to bias the support member in a direction in which the pinion gear A7 separates from the ring gear. 2. The description in the "Detailed Description of the Invention" column in the specification of the present application is amended as follows. 1) Insert "or bushing, etc." next to "C-type retaining ring 13J" on page 4, line 5 of the specification. 2) In the specification, page 5, line 16 to page 7, line 1 [in this application...] is attached. ” is supplemented as follows. ``A feature of the present invention is that in a starting device that transmits the rotation of a starting motor to a ring gear of an engine via a one-way clutch, the rotating shaft rotated by the starting motor is slidable via a helical spline. a drive member that is externally inserted and removably connected to the one-way clutch; and a drive member that is removably connected to the drive member through the one-way clutch and that is rotatably slidable on the rotating shaft. A driven member is installed between the supporting member and the rotating shaft, the driven member having a supporting member movably inserted therein, a pinion gear that is externally inserted into the supporting member and can engage with the ring gear in a freely engaging and releasable manner. The support member is connected to the pinion gear from the ring gear II.
It has a biasing means for biasing in the I-direction. 3) Insert "or bushing, etc." next to "C-type retaining ring 13" on page 8, line 12 of the specification. 'l) "The pinion gear may be configured as..." on page 18, lines 7 to 15 of the specification is corrected as follows. "Although the configuration is such that the pinion gear is pulled in, a configuration in which the pinion gear on the output side is pushed out from the input side may also be used." 3. Figures 1, 2, and 3 of the drawings attached to this application are attached as separate sheets. Correct as shown. (That's all) Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A driving member of a one-sided clutch mechanism is slidably fitted onto a rotating shaft rotated by a starting motor via a helical spline, and is engaged with and disengaged from the driving member through the one-sided clutch. An internal combustion engine in which a driven member, which is freely connected and has a pinion gear formed on its outer circumferential surface that meshes with a ring gear of the internal combustion engine so as to be able to come into contact with and separate from it, is fitted onto the rotating shaft so as to be rotatable and slidable in the axial direction. In the engine starting device, at least one of a support member in which the driven member is fitted over the rotating shaft and a pinion gear fitted in the support member? A starting device characterized by being divided into two parts. 2. A driving member of the one-way latch mechanism is slidably inserted onto the rotating shaft rotated by the starting motor via a helical spline, and is removably connected to the driving member via the one-way latch. A driven member having a pinion gear formed on its outer circumferential surface that engages with a ring gear of an internal combustion engine so as to be able to move into and out of contact with the ring gear of the internal combustion engine is rotatably inserted into the rotating shaft and slidably in the axial direction, and one end is attached to the driven member. In the starting device for an internal combustion engine, a biasing means for abutting the driven member in a direction in which the pinion gear separates from the ring gear is inserted externally into the rotating shaft, wherein the biasing means contacts the driven member. and the rotating shaft.