JP2656313B2 - One-way clutch - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a one-way clutch used by being incorporated in, for example, an engine of a motorcycle.

[Conventional technology]

Conventionally, this type of one-way clutch is generally manufactured by cutting out a round bar-shaped steel material, but a method of reducing machining by dividing the one-way clutch into two parts and using one of them made of synthetic resin. Has been proposed by JP-A-60-26822.

This will be described with reference to FIGS. FIG. 5 is a front view of the one-way clutch, and FIG. 6 is VI-VI of FIG.
FIG. 7 is a sectional view taken along line VII-VII of FIG. 6.

The clutch body 44 has a two-part structure including a housing part 45 made of synthetic resin and a plate part 46 made of sheet metal. The housing part 45 is formed in an annular shape, and a boss part 48 of a starting gear is rotatably fitted in a circular opening part 47 formed in the center thereof. Recesses 49 are formed at three locations on the inner peripheral surface of the opening 47 at intervals in the circumferential direction, and each of the recesses 49 is opened on one side surface of the housing portion 45 for die cutting. A cylindrical roller 50 is rotatably accommodated in the concave portion 49 in the direction around the axis. Further, the housing portion 45 is integrally formed with mounting grooves 51 which are respectively opened on one inner surface of the concave portion 49, and the pressing rods 52 can be protruded and retracted into the concave portions 49 in these mounting grooves 51. Contained,
A roller 53 urges the roller 50 in the rotation direction of the boss 48.

On the other hand, the plate portion 46 is fixed to one side surface of the housing portion 45 via a screw 54, and a through hole 55 formed in the center thereof is spline-coupled to the crankshaft of the engine. It is designed to rotate integrally with the shaft. The plate portion 46 covers one side opening of the concave portion 49 and the mounting groove 51, and the tongue piece portion 56 is formed integrally with the outer peripheral portion of the plate portion 46 by pressing at a position corresponding to each concave portion 49. Have been. The tongue piece portion 56 rotatably sandwiches the roller 50 between the outer peripheral surface of the boss portion 48 and the tongue piece portion 56 so as to approach the outer peripheral surface of the boss portion 48 as it advances in the rotation direction of the boss portion 48. It is inclined.

Since the one-way clutch 43 firmly sandwiches the roller 50 between the boss portion 48 and the tongue piece portion 56 of the starting gear by the operation of the starter motor, the rotation of the boss portion 48 is transmitted to the plate portion 46 via the roller 50, Further, it is transmitted to the crankshaft. When the plate 46 rotates with the start of the engine, the tongue piece 56 rotates prior to the boss 48, so that the roller 50 between the boss 48 and the tongue piece 56 is rotated. The tightening is released, the plate portion 46 idles with respect to the boss portion 48, and no power transmission is performed.

[Problems to be solved by the invention]

However, in the above-described conventional one-way clutch, the roller 50 is firmly sandwiched between the boss portion 48 of the starting gear and the tongue piece portion 56 at the time of starting.
56 is pressed in the radial direction and the tongue piece 56 escapes outside,
There is a problem that the rotation of the boss portion 48 is not transmitted to the plate portion 46.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and has as its object to provide a one-way clutch that can reliably transmit power at the time of starting.

[Means for Solving the Problems] For this purpose, a one-way clutch according to the present invention has a clutch body in which a housing part 16 and a plate part 13 made of sheet metal are divided into two parts, and the plate part is fixed to a side surface of the housing part.
12 and a circular opening formed in the center of the housing part
A rotating member 7 rotatably fitted to 21; a rotating shaft 2 coupled to the center of the plate portion coaxially with the rotating member;
A plurality of recesses 22 formed on the inner peripheral surface of the opening, a roller 15 rotatably housed inside the recess, and the rotating member formed integrally with the plate portion and at a position corresponding to the recess; A tongue piece 31 that is inclined so as to approach the outer peripheral surface of the rotating member as it advances in the rotation direction of the rotating member. The roller is interposed between the tongue piece and the outer peripheral surface of the rotating member, and the rotation of the rotating member A one-way clutch that transmits the clutch body to the rotating shaft by disengaging the clutch body.
An arc-shaped reinforcing portion 31a formed so as to extend the outer peripheral surface of the housing portion 16 on the outer peripheral surface of the housing portion 16 is provided, and the tongue piece portion 31 is formed in a circumferential direction of a peripheral edge 13a of the plate portion and a peripheral wall 31b of the reinforcing portion connected thereto. Is formed by denting a short part of the tongue piece 31 toward the outer peripheral surface side of the rotating member 7, and the reinforcing part 31
A is characterized in that a wall 31c extending in a substantially radial direction of a is connected to the peripheral wall 31b of the reinforcing portion in a stepped manner. Note that the numbers added to the above configuration are compared with the drawings for easy understanding of the present invention, and the present invention is not limited thereto.

[Action]

In the present invention, as shown in FIG. 1, for example, the clutch body 12 sandwiches the roller 15 between the boss portion 7a of the starting gear and the tongue piece portion 31 by the operation of the starter motor, and the boss portion 7a
When the rotation of the starting gear 7 is transmitted to the plate portion 13 via the roller 15, even if a force larger than the roller 15 acts on the tongue piece portion 31, the rotation of the starting gear 7 does not escape outside due to the presence of the reinforcing portion 31a. The power is reliably transmitted to the crankshaft.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a sectional view of a power transmission mechanism using the one-way clutch of the present invention. A crankshaft 2, which extends through the crankcase 1 and is rotationally driven by a piston (not shown), is mounted via a bearing 3.
A boss 7a of a starting gear 7 is rotatably supported on the outside of the crankcase 1 via an inner race 5 and a bearing 6, and the starting gear 7 is connected to a pinion gear 11 of a starter motor 10 via an intermediate gear 9. Are engaged. 12
Is a clutch body according to the present invention, and its plate portion
13 is spline-coupled to the crankshaft 2 and the rollers 15
Thus, power can be transmitted to the boss 7a of the starting gear 7. The collar 17 prevents the seal 19 from coming off. The clutch body 12 allows only power transmission from the starter motor 10 to the crankshaft 2 side. When the starter motor 10 is operated, its rotation is reduced and transmitted to the crankshaft 2 to start.

Next, an embodiment of the one-way clutch of the present invention will be described with reference to FIG. (A) is a cross-sectional view of the vicinity of the one-way clutch along the line AA in FIG. 2, and (B) is a cross-sectional view along the line BB in FIG.

The clutch body 12 has a two-part structure including a housing part 16 made of synthetic resin and a plate part 13 made of sheet metal. The housing portion 16 is formed in an annular shape, and a boss portion 7a of the starting gear 7 is inserted into a circular opening 21 formed in the center thereof.
Are rotatably fitted. Three recesses 22 are formed on the inner peripheral surface of the opening 21 at three locations at intervals in the circumferential direction.
Each concave portion 22 is opened on one side surface of the housing portion 16 for die cutting. The columnar roller 15 is accommodated in the recess 22 so as to be rotatable around the axis. Further, the housing portion 16 is integrally formed with mounting grooves 25 which are respectively opened on one inner surface of the concave portion 22, and a pressing rod 26 can be protruded and retracted into the concave portion 22 in these mounting grooves 25. The roller 15 is accommodated and urged by the spring 27 in the direction of rotation of the boss 7a (in the direction of the arrow in the figure).

On the other hand, the plate portion 13 is fixed to one side surface of the housing portion 16 via a screw 29, and a through hole 30 formed in the center thereof is spline-coupled to the crankshaft 2 of the engine. It is configured to rotate integrally with the crankshaft 2. Then, the plate portion 13 is
And one side opening of the mounting groove 25, and the plate portion 13
The tongue piece 31 is integrally bent at a position corresponding to each concave portion 22 by a press on the outer peripheral portion. This tongue piece 31
The roller 15 is rotatably sandwiched between the outer peripheral surface of the boss 7a and the tongue piece 31 is inclined so as to approach the outer peripheral surface of the boss 7a as the traveling direction of the boss 7a advances.

A feature of this embodiment is that reinforcing portions 31a are formed on both sides of the tongue piece 31. That is, FIG. 1 and FIG.
As shown in the drawing, a reinforcing portion 31a formed so as to extend a peripheral edge 13a of the plate portion 13 on the outer peripheral surface of the housing portion 16 is provided, and the tongue piece portion 31 includes a peripheral edge 13a of the plate portion and a reinforcing portion connected thereto. A part which is short in the circumferential direction with the peripheral wall 31b is formed by indenting the outer peripheral surface side of the rotating member 7, and the tongue piece 31
Wall 31c extending in a substantially radial direction of the reinforcing portion 31a from both ends in the circumferential direction of
And is connected stepwise to the peripheral wall 31b of the reinforcing portion. Therefore,
When the clutch body 12 sandwiches the roller 15 between the boss 7a of the starting gear and the tongue piece 31 by the operation of the starter motor and transmits the rotation of the boss 7a to the plate 13 via the roller 15, the tongue piece Even if a force larger than the roller 15 acts on the 31, there is no escape to the outside due to the presence of the reinforcing portion 31a,
The rotation of the starting gear 7 is reliably transmitted to the crankshaft 2. Then, with the start of the engine, the plate
As the tongue 13 rotates, the tongue piece 31 rotates prior to the roller 15, so that the tightening of the roller 15 between the boss 7a and the tongue piece 31 is released, and the plate 13 is It idles with respect to 7a, and power is not transmitted.

Further, according to the one-way clutch having the above configuration, the power transmission is performed by the boss 7a, the roller 15, and the plate 13.
The housing portion 16 simply has the function of holding the roller 15, the pressing rod 26 and the spring 27, and does not require large mechanical strength.
Therefore, it is possible to mold with synthetic resin or aluminum. In addition, since the plate portion 13 is also a press-formed product, the man-hour for machining is reduced.

In the above embodiment, the reinforcing portions 31a are formed on both sides of the tongue piece 31, but the adjacent reinforcing portions 31a may be formed continuously.

Next, the bending of the tongue piece 31 of the plate 13 will be described with reference to FIG. When the plate portion 13 is punched from one sheet metal using a jig, as shown in the figure, a smooth shear surface 35 with little disturbance in the metal crystal structure and a fracture surface 36 with many disturbances
Is generated. If the tongue piece 31 is bent with the fracture surface 36 inside, cracks may occur due to stress concentration. Therefore, in bending the tongue piece 31, the shear surface 35
Is bent inward to prevent the cracks from occurring.

〔The invention's effect〕

As described above, according to the present invention, as shown in FIG.
The reinforcing part 31a disperses the force acting on the tongue piece 31 and the walls 31c at both ends of the tongue piece 31
The rib acts as a rib against the moment of bending the tongue outward, and the tongue piece 31 has a short circumferential length, so the action of the rib increases and a large force acts on the tongue piece 31 from the roller. However, the clutch body can reliably transmit the rotation of the rotating member to the rotating shaft without escaping outward.

In addition, since there are steps at both ends of the tongue piece, it becomes difficult to form the tongue piece simultaneously with the reinforcing portion. In this case, the tongue piece will be recessed in the material that has been formed into a cup shape by forming the reinforcing part, but the processing at this time is usually based on the inner peripheral surface of the reinforcing part and corresponds to the tongue piece This is performed by fitting a mold having a concave portion to be fitted to the inner peripheral surface. In the present invention, since the reinforcing portion has an arc shape, the mold becomes a cylinder, which facilitates the manufacture of the mold. In addition, an error in the manufacture of the mold hardly occurs, and the tongue piece can be accurately formed.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the one-way clutch of the present invention. FIG. 1 (A) is a cross-sectional view of the vicinity of the one-way clutch along the line AA in FIG. 2, and FIG. FIG. 2 is a cross-sectional view taken along the line B, FIG. 2 is a cross-sectional view of a power transmission mechanism using the one-way clutch of the present invention, FIG. 3 is a perspective view showing a main part of FIG. 1, and FIG. FIG. 5 is a front view of the one-way clutch, FIG. 6 is a sectional view taken along line VI-VI of FIG. 5, and FIG. 7 is a sectional view taken along line VII-VII of FIG. is there. 2 ... Crank shaft (rotating shaft), 7 ... Start gear (rotating member), 7a ... Boss, 12 ... Clutch body, 13 ... Plate, 15 ... Roller, 16 ... Housing, 21 …… Opening, 22 …… Recess, 25 …… Mounting groove, 26 …… Pressing rod, 27…
... Spring, 29 ... Screw, 31 ... Tongue piece, 31a ... Reinforcing part.

Claims (1)

(57) [Claims] 1. A clutch body in which a housing part and a plate part made of sheet metal are divided into two parts and a plate part is fixed to a side surface of the housing part, and a circular opening formed in the center of the housing part is rotatable. A fitted rotating member, a rotating shaft coaxially coupled to the rotating member at the center of the plate portion, a plurality of recesses formed in an inner peripheral surface of the opening, and rotatable inside the recessed portion. And a tongue piece that is formed integrally with the plate portion and that is inclined at a position corresponding to the concave portion so as to approach the outer peripheral surface of the rotating member as it advances in the rotating direction of the rotating member, The roller is sandwiched between the tongue piece and the outer peripheral surface of the rotating member,
A one-way clutch for transmitting rotation of a rotating member to a rotating shaft by disengaging a clutch body, comprising an arc-shaped reinforcing portion formed to extend a peripheral edge of the plate portion on an outer peripheral surface of a housing portion, The tongue piece is formed by denting a part of the peripheral edge of the plate part and the peripheral wall of the reinforcing part connected to the peripheral part that is short in the circumferential direction toward the outer peripheral surface side of the rotating member, and reinforcing the tongue piece from both ends in the circumferential direction. A one-way clutch, wherein the one-way clutch is connected stepwise to a peripheral wall of the reinforcing part by a wall extending in a substantially radial direction of the part.