JPH0116990B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a centrifugal force governor device used in starting devices for internal combustion engines of automobiles, motorcycles, etc., and in particular, the structure is simplified by combining a weight holder and a plate into one component. This paper proposes a centrifugal force governor device that can reduce parts costs and assembly man-hours.

In general, motorcycle engine starting devices are
It is constructed as shown in FIG. In FIG. 1, a clutch outer 3 corresponding to a driving part of a one-way clutch device is carved on a fitting 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 extrapolated to be slidable in the axial direction via a helical spline 4. A pinion gear 12, which is a driven part of the one-way clutch 11, is fitted onto the rotary shaft 2 through a bearing 13 so as to be rotatable and slidable in the axial direction, and a coil spring 14 is attached to one of the pinion gears 12, which is a driven part of the one-way clutch 11.
It is inserted with its end in contact with the end surface of the pinion gear 12. This coil spring 14 is housed within a spring cover 15, and the spring cover 15 is fixed by a stopper 16 so as not to move in the axial direction.

As shown in the exploded perspective view of FIG. 2, on the outer circumferential surface of the constricted portion of the clutch outer 3, there is an annular spring 5, a weight holder 6 having a branch portion 6b that equally branches into three parts, and a bottom portion. A governor weight 7 is formed by radially dividing a circular plate into three equal parts, a plate 8 having an insertion hole 8a formed in the bottom of the circular plate, a C-shaped retaining ring 9, and a step A formed on the side. 6 of the weight guide 10 forming a bowl shape
A centrifugal governor device consisting of various parts is installed. The centrifugal force governor device made up of these parts is constructed as shown in the enlarged sectional view of the main part in FIG. In FIG. 3, the three governor weights 7 are supported by weight holders 6 which are press-fitted and inserted into the clutch outer 3 so as to be equally spaced apart from each other with their branch portions 6a in between. The clutch outer 3 is sandwiched between the plate 8 which is inserted adjacent to the clutch outer 3 and the back surface B of the clutch outer 3. A C-shaped retaining ring 9 that is externally inserted and fixed adjacent thereto restricts movement of the governor weight 7 in the axial direction using the plate 8 as a holding plate. Further, the governor weight 7 is collectively tightened onto the outer periphery of the annular portion of the weight holder 6 by the elastic tightening force of the annular spring 5 wound from the outside. In order to accommodate all of these inside the bowl, a weight guide 10
is externally fixed to the rotating shaft 2.

As mentioned above, the engine starting device is composed of many small parts such as not only the centrifugal force governor device but also the one-way clutch mechanism. This was a major factor in the rise. In particular, since the centrifugal force governor device has a relatively large number of parts and the assembly procedure is troublesome, there has been a strong desire to simplify its structure. Furthermore, since the weight holder 6 is press-fitted and inserted into the clutch outer 3, its fitting surface must be formed with high dimensional accuracy, which also causes an increase in the number of man-hours for manufacturing the parts.

The present invention has been made in view of the above points, and by reducing the number of parts and improving the fitting method, the assembly procedure is simplified and the cost is reduced by reducing the overall man-hours such as assembly and parts management. The purpose is to provide a centrifugal force governor device that can reduce the amount of force and stabilize the quality. The present invention is characterized by a holder plate having a plurality of radially branched branch parts non-rotatably fitted to a clutch outer which is slidably fitted in the axial direction to the rotating shaft; a plurality of governor weights whose movement in the axial direction is regulated and which are supported so as to be movable in the radial direction spaced apart from each other at the branch portions;
an annular spring that is wound around the outer periphery of the governor weight and tightens the plurality of governor weights;
In a centrifugal force governor device having a weight guide disposed close to the governor weight and engaged with the governor weight moved in the radial direction, the holder plate is provided with a recessed portion in a central portion, and a central portion of the recessed portion is provided with a recessed portion. An insertion hole having a flat part that engages with the flat part of the clutch outer is bored in the clutch outer, and the branch part of the holder plate is formed in the shape of a U-shaped groove.

Next, a specific embodiment of the present invention will be described based on the attached drawings. FIG. 4a is a sectional view of a main part of a centrifugal force governor device according to the present invention installed in a starting device of a motorcycle. Note that the same parts as in the embodiment according to the prior art are denoted by the same reference numerals. In FIG. 4a, a clutch outer 3 is fitted onto the rotating shaft 2 via a helical spline 4 so as to be slidable in the axial direction. clutch outer 3
consists of a bowl-shaped large diameter portion 3a and a cylindrical small diameter portion 3b protruding outward at the center of the bowl bottom,
A one-way clutch 11 made up of a plurality of rollers 11a and a spring 11b is installed inside the bowl of the large-diameter portion 3a.
One end portion of the pinion gear 12 corresponding to the driven portion 1 is inserted through the pinion gear 12 .

As shown in FIG. 5, the outer circumferential surface of the small diameter portion 3b of the clutch outer 3 has five flat surfaces equally spaced over the entire circumference, forming a so-called five-sided pattern. The holder plate 6' according to the present invention has an insertion hole formed in the center thereof with a five-sided pattern so as to be able to fit into the outer peripheral surface with the five-sided pattern.
It is fitted onto the small diameter portion 3b and fixed with a C-shaped retaining ring 9 so as not to move in the axial direction. Therefore, since both of the above-mentioned parts are fitted on the surfaces having five-sided flat parts, they cannot rotate with each other, and when the clutch outer 3 rotates, the holder plate 6' also rotates integrally. By configuring as described above, compared to the conventional method of press-fitting and extrapolation, it is possible to allow a certain tolerance for the machining accuracy of the mating surface, making the manufacturing easier and assembling. This also makes it easier to obtain stable quality.

The holder plate 6' according to the present invention is formed as shown in the perspective view of FIG. A shallow bowl-shaped recess 6'c is formed on the periphery of the main body, and a shallow bowl-shaped recess 6'c is provided in the center, and the aforementioned five-sided cut-out insertion hole 6'b is bored in the center. This holder plate 6' has the functions of two parts, the weight holder 6 and the plate 8, of the parts of the prior art centrifugal force governor device shown in FIG. That is, a governor weight 7, which will be described later, is held between the bottom outer surface B of the large diameter portion 3a of the clutch outer 3 to prevent it from moving in the axial direction, and a holder plate 6' is also placed between each of the plurality of governor weights 7. The individual governor weights 7 are supported on the outer circumferential surface of the small diameter portion 3b of the clutch outer 3, with branch portions 6'a interposed therebetween, so as to be equally spaced apart from each other.
Therefore, the governor weight 7 can be moved in the axial radial direction. In this embodiment, the branch portion 6'a of the holder plate 6' is formed in the shape of a U-shaped groove, and both side surfaces of the branch portion 6'a protrude in the axial direction. This is more preferable because it can be easily formed by simply bending it at right angles, and the material can be used effectively.

Then, substantially similar to the prior art described above, three governor weights 7 each having a shape obtained by equally dividing a round plate radially into three parts, with most of the bottom part as an insertion hole, are extracted.
The clutch outer 3 is supported by the holder plate 6' so as to be immovable in the axial direction but movable in the radial direction. They are all tied together on the outer circumferential surface of the small diameter portion 3b.

Furthermore, a weight guide 10 forming a bowl shape
However, there are multiple governor weights 7 inside the bowl.
It is fitted onto the rotating shaft 2 in a manner that accommodates the built-in parts such as the like, and is fixed with a C-shaped retaining ring 9 so as not to move in the axial direction. A step A is formed on the side of the weight guide 10 that is close to the governor weight 7, and as will be described later, the governor weight 7 that has been moved in the radial direction of the shaft due to centrifugal force engages with the step A. Functions as a sliding stopper.

In this embodiment, three governor weights 7 are supported by three branches 6'a provided on the holder plate 6', but two or more governor weights 7 are supported by two branches. Alternatively, it may be supported by four or more branches. Alternatively, the number of governor weights may be half the number of branches, and half the number of empty sections where no governor weights are supported may be created between the branches.

The operation of the above-described embodiment configured as described above will be explained next. In FIG. 4a, when the starting motor (not shown) is turned on and the rotating shaft 2 connected to it starts a rapid high-speed circuit, the helical spline 4 functions, and the clutch outer 3 and the governor weight 7 attached thereto The centrifugal force governor device and the like other than the weight guide 10 slide integrally in the axial direction to the left in the figure. At this time, the governor weight, which is only bound to the outer peripheral surface of the clutch outer 3 by the annular spring 5, is also regulated by the holder plate 6' and moves together in the axial direction. After sliding a predetermined distance, the other end of the pinion gear 12 comes into contact with a stopper (not shown) and the sliding is stopped. It has moved to a position beyond A. When the sliding of the integral sliding part is stopped, the rotating shaft 2
It starts rotating integrally in synchronization with. Then, a centrifugal force acts on the governor weight 7, which is bound by the annular spring 5 on the outer peripheral surface of the clutch outer 3, and as shown in FIG. The governor weight 7 moves in each direction as if floating. At this time, since each governor weight 7 is supported by the branch portion 6'a of the holder plate 6' at an even distance,
Move radially evenly. Then, it comes into contact with the side inner circumferential surface of the adjacent weight guide 10, and its radial movement is stopped. That is, the circle defined by the outermost circumferential surfaces of the three governor weights 7 is expanded until it touches the inner circumferential surface of the large diameter portion of the weight guide 10 beyond the step A. Therefore, even if a force that inadvertently returns the clutch outer 3 in the axial direction to the right in the figure is applied to the clutch outer 3, etc. when the clutch outer 3 rotates, the governor weight 7 moving in the radial direction will not engage with the step A. Its sliding is stopped and it functions as a centrifugal force governor device.

Eventually, the starting device equipped with the centrifugal force governor device according to the present invention will stably drive the engine.
When the starting motor (not shown) is turned off, the rotating shaft 2
is stopped and the clutch outer 3 fitted with a helical spline is also stopped, so the centrifugal force acting on the governor weights 7 disappears, and each of the governor weights 7, which had been floating, is moved to the annular spring 5. The original clutch outer 3 is restored by elastic tightening force.
The small diameter portion 3b returns to the outer circumferential surface of the small diameter portion 3b, and its enlarged outer diameter is contracted to release its stopper function. At this time, each governor weight 7 is quickly returned evenly along the branch portion 6'a of the holder plate 6'. Furthermore, at the same time as the rotation of the rotating shaft 2 stops, the helical spline 4 functions and a force that instantaneously returns the clutch outer 3 to the right acts on the clutch outer 3, and the centrifugal force governor device etc. attached to the clutch outer 3 is The integral sliding portion quickly returns integrally to its original position before starting.

In this embodiment, each governor weight 7 is directly tied to the outer peripheral surface of the small diameter portion 3b of the clutch outer 3 by the annular spring 5, so that a large contact area between the two can be ensured.
The operation of returning each governor weight 7 to its original position is stabilized.

As described in detail above, according to the present invention, the number of parts of the centrifugal force governor device can be reduced by combining two parts into one part. Therefore, not only the cost of parts is reduced, but also the assembly becomes easier and the assembly man-hours are shortened, and indirect man-hours such as parts management are also reduced, making it possible to reduce the overall cost of the centrifugal force governor device. becomes. Furthermore, by improving the fitting method of parts from press-fitting to insertion, not only ease of assembly is improved, but also stable quality can be obtained. 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, the portion of each governor weight around which the annular spring is wound may be recessed into a groove shape.

[Brief explanation of drawings]

Figure 1 is an upper half sectional view showing a starting device for a motorcycle equipped with a conventional centrifugal force governor device;
The figure is an exploded perspective view of a conventional centrifugal force governor device.
4a and 4b are cross-sectional views of essential parts of a starting device for a motorcycle, showing an embodiment of the centrifugal governor device according to the present invention. The figures show a state before startup and a state in which the centrifugal force governor device is activated after startup, respectively, and FIG. 5 is an axial radial cross-sectional view of the first embodiment of the centrifugal force governor device according to the present invention, The figure is a perspective view showing the holder plate in the first embodiment of the centrifugal force governor device according to the present invention. (Explanation of symbols), 3: clutch outer, 5: annular spring, 6: weight holder, 6': holder plate, 6a, 6'a: branch, 7: governor weight, 8: plate, 10: weight guide.

Claims (1)

[Claims] 1. A holder plate having a plurality of radially branched branches that are non-rotatably fitted to a clutch outer that is slidably fitted in the axial direction to the rotating shaft, and movement in the axial direction is regulated by the holder plate. and a plurality of radially movably supported governor weights spaced apart from each other at the branch portions;
an annular spring that is wound around the outside of the governor weight and tightens the plurality of governor weights;
In a centrifugal force governor device having a weight guide disposed close to the governor weight and engaged with the governor weight moved in the radial direction, the holder plate is provided with a recessed portion in a central portion, and a central portion of the recessed portion is provided with a recessed portion. 1. A centrifugal force governor device characterized in that an insertion hole having a flat portion that engages with a flat portion of a clutch outer is bored in the holder plate, and a branch portion of the holder plate is formed in a U-shaped groove shape.