JP2705776B2 - Non-rotating rotor structure of engine generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a rotor detent for an engine generator for stopping rotation of the rotor when the rotor of the generator is attached to and detached from a crank during maintenance of the engine. Regarding the structure.

(Prior art) The rotor of an engine generator is taperedly fitted to the end of the crankshaft that extends outside the engine case, and is fixed on the crankshaft with a bolt axially screwed to the end of the crankshaft. The magnet is attached to the inner peripheral surface of the outer peripheral flange portion.

In the maintenance (disassembly and assembly) of the engine, the rotor must be attached to and detached from the crankshaft. This attachment and removal requires the work of loosening and tightening the bolts screwed to the end of the crankshaft. However, this operation is not actually possible unless the rotation of the rotor and the crankshaft is stopped.

Therefore, a special tool for stopping the rotation of the rotor has been proposed, and the rotor has been conventionally attached and detached using the special tool.

(Problems to be Solved by the Invention) However, in the absence of a special tool, maintenance of the engine cannot be easily performed, and the special tool is strongly tightened by a flange portion of the rotor. Since the rotation is stopped, the flange portion of the rotor is deformed by receiving a large external force, and there is a problem that the magnet attached to the inner peripheral surface may be damaged and the power generation capability may be reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a rotor detent for an engine generator that can easily detent and detach the rotor without using a special tool. It is to provide a structure.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a crankshaft rotatably supported on an engine case, which is fitted to an end of the crankshaft extending outside the engine case. Attached to the crankshaft with the provided screw, the rotor has a disk-shaped rotor member attached to the crankshaft and extends outwardly to form a U-shaped cross section. In the rotor detent structure of the engine generator, wherein a cover member that covers a part thereof is attached to an end surface of the engine case so as to be close to and opposed to the surface of the rotor member on the engine case side, the outer peripheral side of the rotor member While drilling a through hole parallel to the crankshaft,
A through-hole smaller in diameter than the through-hole is formed substantially coaxially in the cover member, and a portion of the end surface of the engine case facing the through-hole of the cover member is larger than an opening area of the through-hole of the cover member. A recess having an opening area is formed, and a tool can be inserted from a through hole of the rotor member to a recess of the engine case.

(Operation) According to the present invention, the cover member that covers a part of the rotor is attached to the end surface of the engine case so as to approach and face the surface of the rotor member on the engine case side. A through hole for inserting a tool is formed in parallel, and a through hole having a diameter smaller than that of the through hole is formed substantially coaxially in the cover member, so that a tool such as a screwdriver can be inserted through the rotor and the cover member when the rotor is attached or detached. If the rotor is gripped through the hole, the rotation of the rotor is prevented by the tool as a stopper, the screw at the end of the crankshaft can be tightened or loosened, and the rotor can be detached with good workability. Since the through hole of the cover member is close to the through hole of the rotor member, the bending moment acting on the tip of a tool such as a screwdriver is suppressed even if the rotational force of the screw increases, and the rotor can be rotated with a small force. Can be prevented, and the insertion of the tool into the through hole does not take much time, so that the operation can be easily performed in a short time.

In addition, there is no need to prepare a special dedicated tool, and even if the rotor is configured to have a magnet mounted inside the outer peripheral portion, no external force acts on the outer peripheral portion, so that the magnet is not damaged.

Furthermore, since the through hole of the rotor is larger in diameter than the through hole of the cover member, a tool can be easily inserted into this through hole. Since a concave portion having an opening area larger than the opening area of the through hole of the cover member is formed, even a tool having a pointed or chamfered tip, such as a screwdriver, can be inserted as far as it will go. The portion is released into the recess of the engine case, and a tool such as a driver is not supported by the through hole of the cover member and does not slip or fall out of the through hole.

By the way, the engine case is generally manufactured by casting, and the concave portion of the engine case is formed at the same time as casting, so that the labor for later machining is omitted.

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view (a cross-sectional view taken along the line II of FIG. 2) showing a rotor detent structure of an engine generator according to the present invention, and FIG. 2 is a side view of the engine.

In the engine 1 shown in FIG.
Is a transmission case, in which a crankshaft 4 which is long in the direction perpendicular to the plane of FIG. 2 slides in a crankcase 3a formed integrally with the transmission case 3 (only one is shown in FIG. 1). It is rotatably supported via. A drum-shaped rotor 6 is taperedly fitted to an end 4a of the crankshaft 4 extending out of the crankcase 3a.
1 is tightened with a bolt 8 which is screwed in the axial direction to the end 4a, and receives a leftward axial force in FIG. 1 via a washer 9 to thereby be firmly bound to the crankshaft 4.

The rotor 6 is constituted by integrally connecting a boss member 6a and a disk-shaped rotor member 6b with six rivets 10 (see FIG. 2), and the outer periphery of the rotor member 6b is outward. And is formed in a U-shaped cross section. Then, a portion 6b-1 of the rotor member 6b facing the crankcase 3a.
Two through holes 11, 11 are bored in parallel with the crankshaft 4 (see FIG. 2). In addition, this rotor 6
On the inner peripheral surface of the flange portion 6b-2 of the rotor member 6b, a cylindrical magnet 12 is positioned by a collar 13, and is held by a cover 14 made of sheet metal.

On the other hand, on the end surface of the crankcase 3a, a cover member 15 covering a part of the rotor 6 is close to and opposed to the surface of the rotor member 6b on the side of the crankcase 3a, and a plurality of bolts 16.
The through-holes 11 and 1 of the cover member 15
Another through-hole 17 having a diameter smaller than that of the through-holes 11 and 11 is formed substantially coaxially at a portion facing 1. Although not shown,
A bowl-shaped cap holding a coil is attached to the cover member 15, and FIGS. 1 and 2 show a state where the cap is removed.

Further, at the end face of the crankcase 3a facing the through hole 17 of the cover member 15, the through hole 17 of the cover member 15 is provided.
A concave portion 3a-1 having an opening area larger than the opening area is formed.

Thus, when the engine 1 is maintained, the rotor 6 must be attached to and detached from the crankshaft 4. The attachment and detachment of the rotor 6 is performed in the following manner.

That is, for example, to remove the rotor 6 from the state shown in FIG. 1, the rotor 6 is turned so that one of the through holes 11 formed therein is aligned with the through hole 17 formed in the cover member 15, and As shown in FIG.
When the screwdriver is further inserted into the through hole 17, the tip of the driver 18 is bridged between the rotor 6 as a rotating member and the cover member 15 as a stationary member.
The stopper 18 prevents rotation of the rotor 6.

When the rotation of the rotor 6 is fixed as described above, the bolt 8 can be easily loosened and removed, and then the unillustrated screw portion 4b formed on the inner periphery of the end 4a of the crankshaft 4 is formed. If the bolt is screwed in, the rotor 6 can be pulled out from the end 4a of the crankshaft 4 and easily removed.

Although the removal operation of the rotor 6 has been described above, the installation operation of the rotor 6 is performed in the same manner as described above. That is, if the driver 18 is passed through the through holes 11 and 17 after the rotor 6 is fitted into the end 4a of the crankshaft 4 as shown in the figure, the rotation of the rotor 6 is fixed.
Can be easily screwed to fasten the rotor 6 to the crankshaft 4.

As described above, in the present embodiment, the cover member 15 covering a part of the rotor 6 is the crankcase of the rotor member 6b.
The through holes 11, 11 are attached to the end of the crankcase 3a so as to be close to and opposed to the surface on the 3a side, and through which the driver 18 is inserted parallel to the crankshaft 4 on the outer peripheral surface side of the rotor member 6b.
And a through hole 17 smaller in diameter than the through holes 11 and 11 is formed substantially coaxially in the cover member 15. , 17, the driver 18 serves as a stopper to prevent the rotation of the rotor 6, so that the bolt 8 can be tightened or loosened, and the rotor 6 can be detached with good workability.

Since the through hole 17 of the cover member 15 is close to the through hole 11 of the rotor member 6b, the bending moment acting on the tip of the driver 18 is suppressed even if the rotational force of the bolt 8 increases, and the The rotation of the rotor 6 can be prevented by force, and since the insertion of the driver 18 into the through holes 11 and 17 does not take much time, the operation can be easily performed in a short time.

In addition, there is no need to prepare a special dedicated tool, and no external force acts on the flange 6b-2 of the rotor 6 at the time of attachment / detachment, so that the magnet 12 attached to the inner periphery of the flange 6b-2 is damaged. Inconveniences such as running do not occur.

Further, since the through holes 11, 11 of the rotor 6 are larger in diameter than the through holes 17 of the cover member 15, a driver 18 can be easily inserted into the through holes 17, and
Since a concave portion 3a-1 having an opening area larger than the opening area of the through hole 17 of the cover member 15 is formed at a position facing the through hole 17 of the cover member 15 at the end face of the 3a, the tip is pointed like a driver 18. Even if it is a tool, if this is inserted all the way, this part is escaped to the concave portion 3a-1 of the crankcase 3a, and the driver 18 is unstablely supported by the through hole 17 of the cover member 15 and slips, It does not come off from the through hole 17.

By the way, the crankcase 3a is generally manufactured by casting, and the concave portion 3a-1 of the crankcase 3a is formed at the same time as casting, so that the labor for machining later is omitted.

(Effects of the Invention) As is clear from the above description, according to the present invention, the crankshaft rotatably supported by the engine case is fitted to the end extending outside the engine case, and provided at the end. A rotor having a U-shaped cross-section, which is attached to the crankshaft with a female screw and extends outwardly around the outer periphery of a disk-shaped rotor member attached to the crankshaft; In the structure for preventing rotation of the rotor of the engine generator, a cover member covering the portion is attached to an end surface of the engine case so as to be close to and opposed to the surface of the rotor member on the engine case side, A through-hole is formed in parallel with the crankshaft, and a through-hole having a diameter smaller than the through-hole is formed in the cover member substantially coaxially. A recess having an opening area larger than the opening area of the through-hole of the cover member is formed at a position facing the through-hole of the bar member, and a tool can be inserted from the through-hole of the rotor member to the recess of the engine case. In addition, the effect is obtained that the rotor can be easily stopped and attached and detached without using a special tool.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view (a cross-sectional view taken along line II of FIG. 2) showing a rotor detent structure of an engine generator according to the present invention.
The figure is a side view of the engine. 3a …… Crankcase (engine case), 3a-1 ……
Recessed part, 4 ... crankshaft, 8 ... bolt (screw), 6 ...
... rotor, 6b ... rotor member, 11 ... through hole, 15 ...
... cover member, 17 ... through-hole, 18 ... driver (tool).

Claims (1)

(57) [Claims] 1. A crankshaft rotatably supported by an engine case is fitted to an end of the crankshaft extending outside the engine case, and is attached to the crankshaft with a screw provided at the end. An outer periphery of a disk-shaped rotor member to be attached is outwardly extended, the rotor has a U-shaped cross section, and a cover member covering a part of the rotor is a surface of the rotor member on the engine case side. A detent structure for the rotor of the engine generator, which is attached to an end face of the engine case so as to be close to and facing the engine case, wherein a through hole is formed in an outer peripheral side of the rotor member in parallel with the crankshaft; A through-hole smaller in diameter than the through-hole is formed substantially coaxially in the cover member, and the cover member is provided at an end face of the engine case at a position facing the through-hole of the cover member. A rotor detent structure for an engine generator, wherein a recess having an opening area larger than the opening area of the through hole is formed, and a tool can be inserted from the through hole of the rotor member to the recess of the engine case.