JP3037519U - Flywheel magnet rotor with clutch mechanism - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To reduce the size of an engine, even if the moment of inertia of the flywheel is increased under the condition that the increase of the outer diameter of the flywheel is regulated. Get the wheel magnet rotor. SOLUTION: A bottom portion 2a of a flywheel 2 is provided with a clutch positioning attachment region 18a provided with a clutch positioning attachment portion 5'on its inner peripheral side, and from the outer periphery of the clutch positioning attachment region 18a to the outer periphery of the bottom portion 2a of the flywheel 2. The thickness of the bottom portion 2a of the flywheel 2 is made to project toward the clutch outer frame 7 side and is divided into an inertia moment increasing region 18b provided with a projecting portion 2e. The thickness of the bottom portion 2a of the flywheel 2 in the clutch positioning attachment area 18a is set to the minimum necessary thickness required for the bottom portion 2a of the flywheel 2.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a flywheel magnet rotor with a clutch mechanism.

[0002]

[Prior art]

 The flywheel magnet rotor with a clutch mechanism transmits the rotational force of the starter to the flywheel via the clutch mechanism, rotates the rotating shaft of the engine, and starts the engine.

3 and 4 show an example of the structure of a conventional flywheel magnet rotor A with a clutch mechanism.

In a flywheel magnet rotor A with a clutch mechanism, a flywheel 2 is fitted in a tapered portion 1a of a rotary shaft 1 of an engine and a tapered hole 2c provided in a boss portion 2b at the center of a bottom portion 2a thereof. The flywheel 2 is fixed to the rotating shaft 1 of the engine by being fastened by a nut 3 screwed to a tip screw portion 1b of the rotating shaft 1 passing through the boss portion 2b.

A permanent magnet 4 is attached to the inner circumference of a cylindrical portion 2 d that is integrally provided on the outer circumference of the bottom portion 2 a of the flywheel 2.

On the outer surface of the bottom portion 2 a of the flywheel 2 as described above, a concave positioning attachment portion 5 is provided concentrically with the tapered hole 2 c, and the concave positioning attachment portion 5 is provided with a clutch mechanism 6. The clutch outer frame 7 is fitted and positioned. The clutch outer frame 7 is fixed to the bottom 2a of the flywheel 2 by a screw 9 as a fixing means, with the clutch outer frame 7 abutting on the clutch mounting surface 8 which is the bottom surface of the concave positioning mounting portion 5. ing.

In addition to the clutch outer frame 7, the clutch mechanism 6 includes a gear 10 having a boss 10 a supported on the outer periphery of the rotary shaft 1 via a bearing 11 and receiving a rotational force from a starter (not shown). The clutch outer frame 7 includes a plurality of balls 12 interposed between the clutch outer frame 7 and the boss portion 10a of the gear 10 and a spring 13 for urging the balls 12 toward the boss portion 10a. It has a hole 7a into which the boss portion 10a of the gear 10 is inserted, and further has a space 7b for accommodating the ball 12 and a cylindrical hole 7c for accommodating the vane 13 at the outer peripheral edge of the hole 7a.

Next, the operation of the flywheel magnet rotor A with such a clutch mechanism will be described.

When a starter (not shown) is operated, the gear 10 meshing with the starter rotates in the direction of arrow P in FIG. When the gear 10 rotates, the rotary shaft 1 of the engine is rotationally driven via the clutch mechanism 6 and the flywheel magnet rotor A. At this time, in the clutch mechanism 6, the ball 12 frictionally engages the boss portion 10a of the gear 10 and the clutch outer frame 7 with the pressing force of the spring 13, so that the rotational force of the gear 10 is increased by the boss portion 10a-. The ball 12 is transmitted to the flywheel 2 via the clutch outer frame 7.

When the engine is started by the rotation of the rotation shaft 1 and the rotation speed of the engine rises to become higher than the rotation speed of the gear 10, the balls 12 of the clutch mechanism 6 are counteracted by the centrifugal force against the pressing force of the spring 13. Then, the spring 13 is moved in the direction of compressing the spring 13, and the engagement relationship between the clutch outer frame 7 and the boss portion 10a of the gear 10 is released. Therefore, the rotation of the engine is prevented from being transmitted to the starter via the gear 10.

When such a flywheel magnet rotor A with a clutch mechanism is incorporated in, for example, a portable engine, and there is a demand to increase the moment of inertia of the flywheel 2, the flywheel is reduced in size. Since it is not possible to increase the inertial moment by increasing the outer diameter of the wheel 2, the wall thickness of the flywheel 2 is increased to meet the demand for increasing the moment of inertia.

FIGS. 5 and 6 show two examples of the structure of a conventional flywheel magnet rotor A with a clutch mechanism in which the wall thickness of such a flywheel is increased to increase the moment of inertia. Is.

In the flywheel magnet rotor A with a clutch mechanism shown in FIG. 5, the wall thickness is extended to the clutch outer frame 7 side over the entire bottom portion 2 a of the flywheel 2 to increase the moment of inertia. Has been.

On the outer surface of the bottom portion 2a of the flywheel 2 as described above, a positioning attachment portion 5'having a convex shape that is concentric with the taper hole 2c is provided, and the convex positioning attachment portion 5 is provided. The concave portion 7d of the clutch outer frame 7 is fitted into the ‘′ and positioned. The clutch outer frame 7 is fixed to the bottom 2a of the flywheel 2 by a screw (not shown) serving as a fixing means when the clutch outer frame 7 is brought into contact with the clutch mounting surface 8 which is the upper surface of the convex positioning mounting portion 5 '. Has been done.

A stator B is arranged in a space between the permanent magnet 4 and the boss portion 2b in the tubular portion 2d of the flywheel 2. The stator B is composed of a stator core 14 and a generator coil 16 wound around each salient pole of the stator core 14 via a bobbin 15, and is fixed to a fixing member such as an engine cover (not shown) with screws 17. . The flywheel magnet rotor A and the stator B constitute a magnet generator.

Also in the flywheel magnet rotor A with a clutch mechanism shown in FIG. 6, the wall thickness overhangs the entire bottom surface 2 a of the flywheel 2 toward the clutch outer frame 7 side to increase the thickness, thereby increasing the moment of inertia. Has been.

On the outer surface of the bottom portion 2 a of the flywheel 2 as described above, a positioning attachment portion 5 is provided concentrically with the tapered hole 2 c in a concave shape. 7 is fitted and positioned. The clutch outer frame 7 is fixed to the bottom portion 2a of the flywheel 2 by a screw (not shown) serving as a fixing means, with the clutch outer frame 7 abutting on the clutch mounting surface 8 formed of the bottom surface of the concave positioning mounting portion 5. . Other configurations are the same as those in FIG.

[0018]

[Problems to be solved by the device]

 However, in the flywheel magnet rotor A with a clutch mechanism having such a structure, since the increase in the outer diameter of the flywheel 2 is restricted, the wall thickness of the clutch outer frame 7 is reduced over the entire bottom 2a of the flywheel 2. Since it is bulged to the side to increase the moment of inertia, the dimension L from the end surface of the flywheel 2 on the opening side to the clutch mounting surface 8 becomes long, which is an obstacle to miniaturization of the engine. Was there.

An object of the present invention is to provide a clutch mechanism with which the engine can be downsized even when the moment of inertia of the flywheel is increased in a situation where the increase in the outer diameter of the flywheel is restricted. It is to provide a flywheel magnet rotor.

[0020]

[Means for Solving the Problems]

 According to the present invention, a flywheel is attached to a rotating shaft of an engine through a boss, and a clutch outer surface of a clutch mechanism is attached to a clutch mounting surface of a clutch positioning mounting portion provided at the center of a bottom outer surface of the flywheel. (EN) A flywheel magnet rotor with a clutch mechanism which is brought into contact with and positioned and whose clutch outer frame is fixed to the bottom of a flywheel by a fixing means.

In the present invention, the bottom portion of the flywheel has a clutch positioning attachment area provided with a clutch positioning attachment portion on the inner peripheral side thereof, and a bottom portion of the flywheel extending from the outer periphery of the clutch positioning attachment area to the outer periphery of the bottom portion of the flywheel. It is divided into an area of increased moment of inertia in which the wall thickness is extended to the outer frame of the clutch and an overhang is provided. The bottom thickness of the flywheel in the clutch positioning attachment area is set to the minimum required thickness required for the bottom of the flywheel. The bottom wall thickness of the flywheel in the area of increased inertia moment is set to satisfy the inertia moment required for the flywheel. Here, the minimum necessary thickness required for the bottom of the flywheel is the thickness that can satisfy the mechanical strength required for the bottom of the flywheel by adding a safety factor.

In this way, the bottom portion of the flywheel is provided with a clutch positioning attachment region in which the clutch positioning attachment portion is provided on the inner peripheral side, and the bottom of the flywheel is extended from the outer periphery of the clutch positioning attachment region to the outer periphery of the bottom of the flywheel. The wall thickness is divided into an area for increasing the moment of inertia where the wall is bulged to the outer frame of the clutch and a bulge is provided, and the bottom thickness of the flywheel in the clutch positioning attachment area is the minimum required at the bottom of the flywheel. By setting the wall thickness to the limit, the dimension from the end surface on the opening side of the flywheel to the clutch mounting surface can be made shorter than conventional products. Therefore, the engine can be downsized even if the moment of inertia of the flywheel is increased while the increase in the outer diameter of the flywheel is restricted.

Further, since the moment of inertia is proportional to the square of the radius of the mass and the part where the mass exists, if the large mass part is provided on the outer peripheral side of the flywheel as in the present invention, the moment of inertia can be efficiently achieved. Can be increased.

In this case, the positioning attachment portion at the bottom of the flywheel is recessed inward from the bottom outer surface of the flywheel, even if the flywheel bottom protrusion is formed to be convex outward from the bottom outer surface of the flywheel. And may be formed in a concave shape.

Such a flywheel can be formed as an integrally machined product.

[0026]

[Embodiment of the invention]

 FIG. 1 shows a first example of an embodiment of a flywheel magnet rotor A with a clutch mechanism according to the present invention.

In the flywheel magnet rotor A with a clutch mechanism of this example, the bottom portion 2a of the flywheel 2 has a clutch positioning attachment area 18a provided with a convex clutch positioning attachment portion 5'on its inner peripheral side, From the outer circumference of the clutch positioning attachment area 18a to the outer circumference of the bottom portion 2a of the flywheel 2, the wall thickness of the bottom portion 2a of the flywheel 2 is extended to the clutch outer frame 7 side, and the inertia moment increasing area 18b is provided in which the extension portion 2e is provided. It is partitioned.

The thickness of the bottom portion 2a of the flywheel 2 in the clutch positioning attachment area 18a is set to the minimum required thickness required for the bottom portion 2a of the flywheel 2, and the clutch positioning attachment area 18a has a convex shape. A clutch positioning attachment portion 5'is provided.

The thickness of the bottom portion 2a of the flywheel 2 in the inertia moment increasing region 18b is set to satisfy the inertia moment required for the flywheel 2 by setting the protrusion length of the overhanging portion 2e.

Such a flywheel 2 is formed as an integrated total cut product by cutting.

The recess 7d of the clutch outer frame 7 is fitted and positioned in the convex positioning mounting portion 5 ', and the clutch outer frame 7 is attached by a clutch formed by the upper surface of the convex positioning mounting portion 5'. The clutch outer frame 7 is brought into contact with the surface 8 and is fixed to the bottom portion 2a of the flywheel 2 by a screw (not shown) which is a fixing means.

In this way, the bottom portion 2a of the flywheel 2 is provided with the clutch positioning attachment region 18a provided with the clutch positioning attachment portion 5'on its inner peripheral side, and the flywheel 2 from the outer periphery of the clutch position attachment region 18a. Of the flywheel 2 is extended to the clutch outer frame 7 side so as to extend to the outer periphery of the bottom portion 2a of the flywheel 2 and is divided into an inertia moment increasing area 18b provided with an extension portion 2e. When the thickness of the bottom portion 2a of the wheel 2 is set to the minimum necessary thickness required for the bottom portion 2a of the flywheel 2, the dimension from the end surface on the opening side of the flywheel 2 to the clutch mounting surface is the same as the conventional dimension. Since it is shorter than L by α (L-α), the dimension from the end surface of the flywheel 2 on the opening side to the clutch mounting surface is a conventional product. Can be shorter. Here, α is a dimension in which the thickness of the clutch positioning attachment region 18a of the bottom portion 2a of the flywheel 2 is made thinner toward the stator B side than the position of the clutch attachment surface 8 in FIG. Therefore, the engine can be downsized even if the moment of inertia of the flywheel 2 is increased in a situation where the increase of the outer diameter of the flywheel 2 is restricted.

Since the moment of inertia is proportional to the square of the radius of the mass and the portion where the mass exists, the overhanging portion 2e, which is a large mass portion, on the outer peripheral side of the flywheel 2 as in the present invention. By providing, the moment of inertia can be efficiently increased.

FIG. 2 shows a second example of the embodiment of the flywheel magnet rotor A with a clutch mechanism according to the present invention.

In the flywheel magnet rotor A with a clutch mechanism of this example, the bottom portion 2a of the flywheel 2 has a clutch positioning attachment area 18a provided with a concave clutch positioning attachment portion 5 on the inner peripheral side thereof. From the outer circumference of the clutch positioning attachment area 18a to the outer circumference of the bottom portion 2a of the flywheel 2, the thickness of the bottom portion 2a of the flywheel 2 is extended to the clutch outer frame 7 side to provide an inertia moment increasing area 18b in which an extension portion 2e is provided. It is partitioned.

The thickness of the bottom portion 2a of the flywheel 2 in the clutch positioning attachment area 18a is set to the minimum required thickness required for the bottom portion 2a of the flywheel 2, and the clutch positioning attachment area 18a has a concave shape. A clutch positioning mount 5 is provided.

The thickness of the bottom portion 2a of the flywheel 2 in the inertia moment increasing region 18b is set to a thickness that satisfies the inertia moment required for the flywheel 2 by setting the protrusion length of the overhanging portion 2e.

The flywheel 2 as described above is formed as an integrally machined product by cutting.

A clutch outer frame 7 is fitted and positioned in the concave positioning mounting portion 5, and the clutch outer frame 7 abuts the clutch outer frame 7 on the clutch mounting surface 8 which is the bottom surface of the positioning mounting portion 5. Then, it is fixed to the bottom portion 2a of the flywheel 2 by a screw (not shown) which is a fixing means.

As described above, the bottom portion 2a of the flywheel 2 is provided with the clutch positioning attachment area 18a provided with the clutch positioning attachment portion 5 on the inner peripheral side thereof, and the bottom portion 2a of the flywheel 2 from the outer periphery of the clutch positioning attachment area 18a. Of the bottom portion 2a of the flywheel 2 over the outer periphery of the flywheel 2 to be divided into the moment of inertia increasing region 18b in which the protrusion 2e is provided by projecting the thickness of the bottom portion 2a of the flywheel 2 in the clutch positioning attachment region 18a. If the thickness of the bottom portion 2a is set to the minimum required thickness required for the bottom portion 2a of the flywheel 2, the dimension from the end face on the opening side of the flywheel 2 to the clutch mounting face is the same as in the first example. It is shorter than the conventional dimension L by α (L-α), and the distance from the end face on the opening side of the flywheel to the clutch mounting face Law can be made shorter than the conventional product. Therefore, the engine can be downsized even if the moment of inertia of the flywheel 2 is increased in a situation where the increase of the outer diameter of the flywheel 2 is restricted.

Further, since the moment of inertia is proportional to the square of the radius of the mass and the portion where the mass exists, the overhanging portion 2e, which is a large mass portion, on the outer peripheral side of the flywheel 2 as in the present invention. By providing, the moment of inertia can be efficiently increased.

[0042]

[Effect of the invention]

 In the flywheel magnet rotor with a clutch mechanism according to the present invention, the bottom portion of the flywheel is provided with a clutch positioning attachment area provided with a clutch positioning attachment portion on the inner peripheral side thereof, and the flywheel bottom from the outer periphery of the clutch positioning attachment area. The bottom wall thickness of the flywheel in the clutch positioning mounting area is divided into the area for increasing the moment of inertia where the bottom portion of the flywheel extends over the outer circumference of the clutch toward the clutch outer frame side and the protrusion is provided. Since it is set to the minimum required thickness at the bottom of the, the dimension from the end face of the flywheel on the opening side to the clutch mounting face can be made shorter than conventional products. Therefore, the engine can be downsized even if the moment of inertia of the flywheel is increased in a situation where the increase of the outer diameter of the flywheel is restricted.

Since the moment of inertia is proportional to the square of the radius of the mass and the part where the mass exists, providing the large mass part on the outer peripheral side of the flywheel as in the present invention makes the moment of inertia efficient. Can be increased.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a first example of an embodiment of a flywheel magnet rotor with a clutch mechanism according to the present invention.

FIG. 2 is a longitudinal sectional view of a main part of a second example of an embodiment of a flywheel magnet rotor with a clutch mechanism according to the present invention.

FIG. 3 is a vertical cross-sectional view of a conventional flywheel magnet rotor with a clutch mechanism.

FIG. 4 is a sectional view taken along line XX of FIG. 3;

FIG. 5 is a longitudinal sectional view of a main part of an example in which a flywheel magnet rotor with a clutch mechanism of the related art is designed to increase an inertia moment of a flywheel.

FIG. 6 is a longitudinal sectional view of a main part of another example in which the flywheel magnet rotor with a clutch mechanism in the related art aims to increase the moment of inertia of the flywheel.

[Explanation of symbols]

 A Flywheel magnet rotor with clutch mechanism B Stator 1 Rotating shaft of engine 1a Tapered part 1b Screw part 2 Flywheel 2a Bottom part 2b Boss part 2c Tapered hole 2d Cylinder part 2e Overhang part 3 Nut 4 Permanent magnet 5 Concave positioning Mounting part 5 ′ Convex positioning mounting part 6 Clutch mechanism 7 Clutch outer frame 7a Hole 7b Space part 7c Cylindrical hole 8 Clutch mounting surface 9 Screw 10 Gear 10a Boss part 10b Boss part 11 Bearing 12 Ball 13 Spring 14 Fixed iron core 15 Bobbin 16 generator coil 17 screw 18a clutch positioning attachment area 18b inertia moment increasing area

Claims (4)

[Utility model registration claims] 1. A flywheel is attached to a rotating shaft of an engine via a boss, and a clutch outer surface of a clutch mechanism is brought into contact with a clutch mounting surface of a clutch positioning mounting portion provided at the center of a bottom outer surface of the flywheel. A flywheel magnet rotor with a clutch mechanism, which is brought into contact with and positioned, and wherein the clutch outer frame is fixed to the bottom of the flywheel by a fixing means, wherein the bottom of the flywheel is on the inner peripheral side of the clutch positioning attachment part. And a moment for inertia that the wall thickness of the bottom of the flywheel is extended to the clutch outer frame side from the outer periphery of the clutch positioning attachment region to the outer periphery of the bottom of the flywheel to provide the protrusion. An increase area and the clutch positioning attachment area The bottom wall thickness of the flywheel is set to the minimum necessary thickness required for the bottom of the flywheel, and the bottom wall thickness of the flywheel in the moment of inertia increasing region is equal to the moment of inertia required for the flywheel. A flywheel magnet rotor with a clutch mechanism characterized by being set to a wall thickness to satisfy. 2. The positioning attachment portion of the bottom portion of the flywheel is formed in a convex shape by protruding outward from the outer surface of the bottom portion of the flywheel, and the convex positioning attachment portion has a positioning recess portion of the clutch outer frame. The flywheel magnet rotor with a clutch mechanism according to claim 1, characterized in that: 3. The positioning attachment portion at the bottom of the flywheel is formed in a concave shape by recessing inwardly from the outer surface of the bottom of the flywheel, and the clutch outer frame is fitted in the concave positioning attachment portion. The flywheel magnet rotor with a clutch mechanism according to claim 1, wherein the flywheel magnet rotor has a clutch mechanism. 4. The flywheel magnet rotor with a clutch mechanism according to claim 1, wherein the flywheel is formed as an integrally machined product.