JPS6039496Y2 - Internal combustion engine starting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a Pendex-type starting device for starting an internal combustion engine of, for example, a motorcycle.

More specifically, a pinion gear that enters and rotates the ring gear of an internal combustion engine is provided with an axially extending portion, and a stop member that stops the pinion gear from sliding and rotates integrally with the pinion shaft is provided with an axially extending cylindrical portion. The extension part and cylinder part prevent dust from accumulating on the pinion shaft, and a dust seal is attached to the tip of the extension part to prevent dust from entering between the pinion gear and the pinion shaft. The present invention relates to a starting device for an internal combustion engine that ensures smooth sliding of a pinion gear.

For example, a starting device called a Pendex type or a sliding inertia type is known for starting an internal combustion engine of a motorcycle.

In this system, a movable cylindrical member is fitted with a cam spline on the edge of a pinion shaft that is rotated by a starter motor, and a pinion gear is connected to the movable cylindrical member via a one-way clutch.

When the pinion shaft is rapidly rotated by the motor, the movable cylinder member slides on the pinion shaft due to inertia without rotating, and the pinion gear also slides on the pinion shaft and jumps into the ring gear of the internal combustion engine, causing the pinion The movable cylinder member and pinion gear begin to rotate together with the pinion shaft when they come into contact with the stop member provided at the end of the shaft, and the ring gear is forced to rotate, and the internal combustion engine starts and ignites. .

After starting, the pinion gear receives forced rotational force from the ring gear and is rotated freely by the one-way clutch on the pinion shaft and movable cylinder member.

As described above, the pinion gear slides on the pinion shaft in the direction of the ring gear in order to start the internal combustion engine, and after the engine starts, the pinion gear receives rotational force from the ring gear and the rotational speed becomes faster than the pinion shaft and the movable cylinder member, and the return spring The spring force and the drag torque of the one-way clutch cause it to disengage from the ring gear, slide again on the pinion shaft, and retreat to its previous position before being driven by the starter motor.

As described above, in this type of Pendex type starter, it is extremely important that the pinion gear be able to slide smoothly along the pinion shaft in order to ensure the operation of the starter.

Each component, such as the pinion gear and movable cylinder member, is built into a case filled with lubricating oil, and when the starter is operated repeatedly and used over a long period of time, dust naturally gets mixed in with this lubricating oil, and the dust is absorbed by the pinion. If dust gets stuck on the shaft surface and obstructs the sliding movement of the pinion gear, and if dust enters between the pinion gear and the pinion shaft, the pinion gear will not be able to slide smoothly and the internal combustion engine will not be able to start. It disappears.

Therefore, it is required to ensure smooth sliding of the pinion gear along the pinion shaft without being affected by dust.

The inventors of the present invention took into consideration the above-mentioned requirements for a starting device, and developed the present invention to meet these requirements.

The object of the present invention is to provide a device for starting an internal combustion engine by sliding a pinion gear on a pinion shaft and jumping into a ring gear of an internal combustion engine. A stop member disposed at the end of the shaft to stop the pinion gear from sliding has a cylindrical portion facing the extending portion, and the extending portion and the cylindrical portion substantially close the pinion shaft so that the pinion shaft is not moved. Adhesion of dust,
A starting device for an internal combustion engine is provided that prevents deposits.

Another object of the present invention is to attach a dust seal to the tip of the extending portion of the pinion gear, and even if dust accumulates on the pinion shaft, the dust seal removes the dust and allows the pinion gear to slide, thereby preventing a gap between the pinion gear and the pinion shaft. To provide a starting device for an internal combustion engine, which prevents dust from entering and ensures smooth sliding of a pinion gear together with the extension part and the cylindrical part.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a sectional view showing the entire device according to the present invention,
In FIGS. 1 and 3, the forward and backward positions of the movable cylinder member and the pinion gear are shown cut in half and made of synthetic leather along the axis 0-0 of the pinion shaft.

A case 2 is attached to the front part of a starting motor 1 consisting of an armature 1as and a stator housing 1b, and necessary parts are assembled inside this case 2.

The case 2 is filled with lubricating oil, which reduces heat generation, wear, etc. during operation of the parts, and provides a lubricating effect.

A pinion shaft 4 is rotatably supported by bearing bushes 3, 3.
is installed in the case 2, a reduction gear 5 is attached to the rear end, and the drive shaft 1c of the starter motor 1 and the pinion shaft 4 are connected.

A movable cylinder member 6 and a pinion gear 7 are provided front and rear on the pinion shaft 4, a helical spline 6a is formed in the inner diameter hole of the movable cylinder member 6, and a helical spline 4a of a predetermined length meshes with the helical spline 6a on the pinion shaft 4. , and both 4 and 6 are fitted with a helical spline.

A plate-shaped cover 8 is placed on the outer peripheral surface of the rear part of the pinion gear 7, and the rear part of this 8 is bent in the inner diameter direction, and the cover 8 connects the movable cylinder member 6 and the pinion gear 7 in the axial direction.

Furthermore, a one-way clutch 9 consisting of rollers 9a and an elastic spring 9b is interposed between the front outer peripheral surface of the movable cylinder member 6 and the rear inner peripheral surface of the pinion gear 7, and the movable cylinder member 6 and the pinion gear 7 are rotated in the rotational direction. This clutch 9 allows for separation and connection.

Note that 10 is a bushing that is incorporated into the inner diameter hole of the pinion gear 7 and allows the pinion gear 7 to freely rotate with respect to the pinion shaft 4, and 11 is a ring gear for an internal combustion engine such as a motorcycle.

As shown in detail in FIG. 3, the pinion gear 7 is integrally formed with a cylindrical extending portion 12 extending in the forward sliding direction, that is, in the direction of the internal combustion engine, and protrudes to an appropriate length in the axial direction.

A stop member 14 is attached with a clip 13 near the end of the pinion shaft 4.
is integrated and fixed to the pinion shaft 4.

This stop member 14 has a hollow cylindrical shape with the end surface that engages with the clip 13 closed and the end surface on the pinion gear 7 side open, and the outer peripheral surface is a cylindrical portion 15.

The inner diameter of the cylindrical portion 15 is made larger than the outer diameter of the extending portion 12 of the pinion gear 7, so that the extending portion 12 can be inserted into the cylindrical portion 15.

A coil-shaped return spring 16 having a diameter larger than that of the extension part 12 is compressed between the pinion gear 7 and the stop member 14, and this return spring 16 is inserted into the extension part 1.
2 and the inner circumference of the cylindrical portion 15.

Stop member 14 against which both ends of return spring 16 abut
The closed end surface 14a of the pinion gear 7 and the stepped end surface 7a of the pinion gear 7 are formed with retaining grooves 7b and 14b, respectively, and the grooves 7b and 14b prevent the return spring 16 from coming off and popping out, and the cylindrical portion 15 also prevents this from happening. and act.

As mentioned above, the pinion gear 7 has an extending portion 12 extending in the axial direction.
By forming this, the length of contact with the pinion shaft 4 is increased to prevent the pinion gear 7 from tilting during sliding, thereby preventing uneven contact and uneven wear.

engaging and supporting one end of the return spring 16;
The length of the cylindrical portion 15 of the stop member 14, which also serves as a cover for the spring 16, is set to match the length of the extending portion 12 of the pinion gear 7. Specifically, the length of the extending portion 12 and the cylindrical portion 15 facing each other is set to match the length of the extending portion 12 of the pinion gear 7. is heavy in the axial direction as shown in FIGS. 1 and 3 when the pinion gear 7 is in the retracted position before the starting motor 1 is driven, and the tip of the extending portion 12 is slightly inserted into the cylindrical portion 15, or The lengths of the extending portion 12 and the cylindrical portion 15 are set to such an extent that there is a slight gap between them even if there is no weight in the axial direction, and the pinion shaft on which the pinion gear 7 slides even when the pinion gear 7 is retreating. The surface of No. 4 is made to be in a substantially closed state.

Further, a dust seal 17 is fitted into the inner diameter hole at the tip of the extending portion 12, and is fitted onto the pinion shaft 4.

As shown in FIG. 1, a governor holder 19 is integrally fixed to the rear of the movable cylinder member 6 with a circlip 18, and a governor weight 20 is supported by this holder 19.

The governor holder 19 is approximately ring-shaped as shown in FIG. 4, and has an annular base 19a and a protruding piece 19b that protrudes in the outer diameter direction.
・Equipped with.

The governor weight 20 is formed as a plurality of divided pieces, four in the illustrated example, each having a guide groove 20a on the inner peripheral surface, an insertion hole 120b on both end surfaces, and a spring accommodating groove 20c on the outer peripheral surface.

The groove 20a on the inner peripheral surface is loosely fitted into the annular base 19b, and the projecting piece 19
Loosely fit b into R20b on the end face and attach the governor weight 20.
... is axially regulated in position with respect to the movable cylinder member 6 by a governor holder 19, and can be freely expanded and moved in the axial radial direction.

An annular coil spring 21 is fitted into the R20c of the outer peripheral surface of the governor weight 20, and an elastic tightening force in the inner radial direction of the spring 21 is applied to the governor weights 20...

A hollow cylindrical governor case 22 with an open front is provided on the outer peripheral side of the governor weight 20, and the governor weight 20 is housed in the case 22.

The governor case 22 is fixed to the reduction gear 5 and integrated with the pinion shaft 4, and the case 22 is formed into a stepped shape with a small diameter portion 22a at the rear and a large diameter portion 22b at the front. A stepped portion 22c is formed in the portion where the step is removed.

Next, we will discuss the effect.

When the switch is closed and the starter motor 1 is driven, the pinion shaft 4 rotates via the gear 5.

Due to the rapid rotation of the pinion shaft 4, the movable cylinder member 6 slides forward on the pinion shaft 4 due to inertia without rotating, and the pinion gear 7 also slides against the return spring 16, causing the internal combustion engine to move forward. Jump into Ngya 11 and engage.

The pinion gear 7 comes into contact with the closed end surface 14a of the stop member 14 and stops sliding. From this point on, the movable cylinder member 6 and the pinion gear 7 rotate integrally with the pinion shaft 4, and the ring gear 11 is rotated by the pinion gear 7. The internal combustion engine starts and ignites.

After starting, the pinion gear 7 receives forced rotation from the ring gear 11 and rotates freely relative to the movable cylinder member 6 by the one-way clutch 9.

At this time, the governor weight 20 moves forward together with the movable cylindrical member 6 and reaches the large diameter part 22b from the small diameter part 22a of the governor case 22, while resisting the tightening force of the spring 21 by the rotation of the movable cylindrical member 6. The centrifugal force causes the shaft to expand and move in the direction of the outer diameter of the shaft, and the rear end of the outer peripheral edge abuts and engages with the stepped portion 22c of the governor case 22.

Internal combustion engines, especially single-cylinder internal combustion engines and two-stroke internal combustion engines, have uneven rotational speed at the initial stage of startup, and as the rotational speed fluctuates, the rotational speed of the pinion gear 7, which is forced to rotate by the ring gear 11, changes due to the rotational speed of the movable cylinder member 6 and the pinion shaft 4. , and the pinion gear attempts to disengage from the ring gear 11 at an early stage before the internal combustion engine is stably driven by the drag torque of the one-way clutch 9 or the like.

However, as mentioned above, since the governor weight 20 is engaged with the stepped portion 22c of the governor case 22, this separation is not affected, and as long as the pinion shaft 4 is rotating, the rotational force of the pinion shaft 4 is applied to the ring gear 11. The internal combustion engine is reliably transferred from an unstable driving state to a stable driving state.

Therefore, the rotational speed of the pinion shaft 4 can be set separately from the pinion gear disengagement rotational speed, and it is possible to make the starter motor 1 more compact and to have a smaller capacity output.

When the switch is opened to stop the starter motor 1, the rotation speed of the pinion shaft 4 gradually decreases, and accordingly the rotation speed of the movable cylinder member 6 also decreases, the centrifugal force of the governor weight 20 disappears, and the spring 21 The elastic clamping force causes the shaft to move in the direction of the inner diameter of the shaft.

As a result, the engagement with the stepped portion 22c is released, and the pinion gear 7 is rotated by the ring gear 11, so that the drag torque of the one-way clutch 9 due to the rotational speed difference between the pinion shaft 4 and the movable cylinder member 6, and the return spring 16
The pinion gear 7 is disengaged from the ring gear 11 due to the elastic force, and the pinion gear 7 slides on the pinion shaft 4 together with the movable cylinder member 6 and returns to the previous retracted position.

If the above operations are repeated and the device is used for a long period of time, dust will get mixed into the lubricating oil in the case 2. However, as described above, the pinion shaft 4 is
2 and the cylindrical portion 15 of the stop member 14 and are in a substantially closed state, so that the pinion shaft 4 can be removed from dust and protected from dust adhering to and accumulating on the pinion shaft 4.

Furthermore, even if dust adheres to the pinion shaft 4, the dust seal 17 attached to the tip of the extension portion 12 will remove the dust from the surface of the pinion shaft 4 as the pinion gear 7 slides, thereby preventing the contact between the pinion shaft 4 and the pinion gear 7. This prevents dust from entering between the two, thereby ensuring smooth sliding of the pinion gear 7, which is the most important aspect of this type of Pendex type starting device.

In the embodiments described above, the governor weight is used to prevent early disengagement of the pinion gear, but the present invention can be applied not only to such starter devices but also to other starter devices.

As is clear from the above description, according to the present invention, the pinion gear is provided with an extending portion and the stop member is provided with a cylindrical portion so that the pinion shaft is in a substantially closed state, so that dust adheres to and accumulates on the pinion shaft. can be effectively prevented,
In addition, since a dust seal is attached to the tip of the extension, even if dust adheres to the pinion shaft, this dust seal prevents the dust from entering between the pinion gear and the pinion shaft, allowing smooth sliding of the pinion gear along the pinion shaft. This ensures that the starting device can operate reliably.

Furthermore, such effects can be remotely approximated by making some changes to the pinion gear and the stop member, so there is no need to make changes to most other structures, and the structure is simple and easy to extend. The protruding portion can prevent the pinion gear from tilting.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a side sectional view of the entire device, FIG. 2 is a sectional view taken along line 2-2 in FIG.
FIG. 4 is an enlarged view of the main parts and an exploded view of one part of the governor. In the drawings, 4 is a pinion shaft, 6 is a movable cylinder member, 7 is a pinion gear, 9 is a one-way clutch, 12 is an extension, 14 is a stop member, 15 is a cylindrical portion, and 16 is a return spring.

Claims (1)

[Scope of utility model registration request] In a device for starting an internal combustion engine by sliding a pinion gear on a pinion shaft and causing the pinion gear to engage with a ring gear of an internal combustion engine, the pinion gear has an extension that extends toward the ring gear and is slidable on the pinion shaft. A stop member is provided on the pinion shaft to stop the sliding of the pinion gear at a position where the pinion gear meshes with the ring gear, and the stop member has a cylindrical portion that protrudes toward the pinion gear and has a larger diameter than the extending portion. The cylindrical portion and the extending portion keep the pinion shaft in a substantially closed state in the axial direction thereof.Furthermore, a dust seal is provided at the tip of the extending portion to seal between the extending portion and the pinion shaft. A starting device for an internal combustion engine, characterized in that it is fitted.