JPH0223799Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an engine power generation device that has an adjustment window for adjusting ignition timing or valve timing on a crankcase cover to which a stator is fixed.

(Prior Art) As is well known, some engine generators have a rotor fixed to the end of a crankshaft, and a stator fixed to a crankcase cover. This crankshaft is connected to a camshaft of a valve device through a cam chain, and both rotate in synchronization to operate the intake and exhaust valves at predetermined valve timing.

Therefore, after disassembling and servicing the engine, when assembling the crankshaft, power generator, and valve device, it is necessary to align the intake and exhaust valves with the top dead center of the crank. This positioning of the crank top dead center is performed using a matching mark integrally formed on the crankcase cover and a matching mark engraved on the rotor. The engine's ignition timing is also set to the crankshaft top dead center.

By the way, these positions are done after assembling the crankcase cover that fixes the stator, or in order to be able to make adjustments without removing the crankcase cover, the positions of the match marks on the crankcase cover and the match marks on the rotor are There is an adjustment window for viewing the crankshaft and an adjustment window for inserting a tool to rotate the crankshaft.

As shown in Japanese Utility Model Publication No. 43-23215, the adjustment window for viewing this position is covered with a lid that can be opened and closed, or a glass lid is press-fitted to prevent rainwater or dust from entering through the adjustment window. , so as not to adversely affect the operation of the power generator. Furthermore, an aluminum die-cast cap is screwed onto the adjustment window into which the tool is inserted via an O-ring.
By the way, providing the lid so that it can be opened and closed requires a complicated structure, and in the case of a glass lid, there is a problem that oil or the like may adhere from the inside, making it difficult to see the dirt. Also,
Aluminum die-cast caps must be removed and tightened using tools, which is time-consuming.

Furthermore, a soundproof cover is provided on the outside of the crankcase cover, but since the aluminum die-cast cap is located in the center of this soundproof cover, the center cannot be fixed, so engine operation etc. There was a problem with vibration.

(Purpose of the invention) This invention was made in view of the actual situation,
When servicing the engine, the cap for the adjustment window that adjusts the ignition timing or valve timing provided on the crankcase cover can be easily attached and removed.Moreover, this cap is securely supported by the soundproof cover, and the vibration of the soundproof cover is prevented. It is an object of the present invention to provide a power generation device for an engine that is lightened.

(Structure of the invention) In order to achieve the above object, this invention has alignment marks for adjusting ignition timing or valve timing on the rotor part fixed to the end of the crankshaft and the crankcase cover to which the stator part is fixed. In the engine generator, the engine generator is provided with an adjustment window for aligning the mating marks, and a soundproof cover is provided on the crankcase cover, and an elastic cap is inserted into the adjustment window, and the elastic cap is attached to the soundproof cover. It is characterized by being held under pressure.

(Example) Hereinafter, an example of this invention will be described in detail based on the accompanying drawings.

FIG. 1 is a sectional view of a power generation device to which this invention is applied, and FIG. 2 is a side view of the power generation device with a part of the soundproof cover cut away.

In FIG. 1, reference numeral 1 denotes a crankcase, and a crankcase cover 2 is fixed to this crankcase 1. As shown in FIG. A crankshaft 3 is rotatably provided in the crankcase 1 via a bearing 4. A small-diameter gear 5, a medium-diameter gear 6, and a large-diameter gear 7 are inserted in this order into the end of the crankshaft 3, and a nut 8 is screwed through a plate 9 to prevent them from coming off. . The small diameter gear 5 is fixed to the crankshaft 3 and drives an oil pump via a chain 10. Further, the medium diameter gear 6 has its protrusion 6a engaged with the recess 7a of the large diameter gear 7, so that it can rotate integrally.
Furthermore, this large diameter gear 7 is attached to the crankshaft 3 with a key 11.
The crankshaft 3 rotates together with the engaged crankshaft 3.
The medium-diameter gear 6 is connected to a starter motor via a chain 12, and the engine is started by the starter motor. Then, when the engine is started, the engagement between the medium diameter gear 6 and the large diameter gear 7 is released, and the crankshaft 3 begins to rotate. The large-diameter gear 7 is similarly connected to a camshaft of a valve device via a chain 13, so that the crankshaft 3 and the camshaft rotate synchronously.

The power generation device A is composed of a rotor section 14 and a stator section 15. A small flywheel 16 of the rotor portion 14 is fixed to the large diameter gear 7 with a rivet 17, and a permanent magnet 1 is attached to the inner surface of the flywheel 16.
8 is fixed.

The ignition power supply coil 19 of the stator section 14 is wound around an iron core 20 and fixed to the inside of the crankcase cover 2 with bolts 21. Further, an iron core 23 around which a generator coil 22 is wound and a magnet around which a pulser coil (not shown) is wound are similarly fixed to the inside of the crankcase cover 2.

There is a matching mark 24 on the crankcase cover 2.
It extends close to the outer periphery of the flyhole 16. Further, a matching mark 25 is engraved on the outer periphery of the flywheel 16, and when this matching mark 25 is aligned with the matching mark 24, the crank top dead center is set. An adjustment window 26 is formed in the crankcase cover 2 at a portion facing the matching mark 24, and it is confirmed through this adjustment window 26 whether the matching mark 25 and the matching mark 24 match.

Further, an adjustment window 27 into which a tool is inserted is formed in the center of the crankcase cover 2 in a portion facing the nut 8 screwed onto the crankshaft 3.

The adjustment windows 26, 27 are provided with elastic caps 28,
29 is inserted. This elastic cap 28,
29 is integrally molded from oil-resistant rubber, for example, and consists of body portions 28a, 29a having annular lips, and head portions 28b, 29b having cross-shaped cross sections. The elastic caps 28 and 29 are sealed by the lips of the body parts 28a and 29a to prevent rainwater and dust from entering through the adjustment windows 26 and 27.

And the head 28 of the elastic cap 28, 29
b, 29b are pressed by a soundproof cover 30 fixed to the crankcase cover 2. That is, the plate body 30a of the soundproof cover 30 is formed in a circular shape, and a rubber annular seal member 31 is attached to the outer periphery of the plate body 30a. This plate body 30a is supported by an annular support body 30b fixed to the crankcase cover 2 with screws 32, and is fixed so as to press the seal member 31.

As a result, the center part of the plate body 30a of the soundproof cover 30 presses the head 29b of the elastic cap 29,
Further, the head 28b of the elastic cap 28 is pressed at the connecting portion between the plate 30a and the support 30b to prevent it from coming off. Further, the plate body 30a and the support body 30b of the soundproof cover 30 are supported by the elastic force of the elastic caps 29 and 28.

Next, the operation of this embodiment will be explained.

Usually the adjustment windows 26, 27 have elastic caps 28,
No. 29 body parts 28a and 29a are inserted to prevent rainwater or dust from entering through the adjustment windows 26 and 27 and having an adverse effect on the operation of the power generating apparatus A.
And the head 28 of this elastic cap 28, 29
b, 29b are pressed by the soundproof cover 30 to maintain elasticity and prevent them from coming off. On the other hand, this soundproof cover 30 is held by the elastic force of the elastic caps 28 and 29, and vibrations caused by engine drive etc. are prevented. After disassembling and servicing the engine,
When assembling the crankshaft 3, power generator A, and valve device, the intake and exhaust valves and the crank top dead center are aligned. To locate the top dead center of the crank, remove the soundproof cover 30, then attach the elastic caps 28, 2.
9. Remove the heads 28b and 29b by hand. First, with the intake and exhaust valves positioned at predetermined positions, insert the tool through the adjustment window 27, and then insert the tool into the adjustment window 27.
While looking at the matching marks 25 and 24 from 6 onwards, turn the flywheel 16 to make them coincide. Then, the chain 13 is connected to the large diameter gear 7 of the crankshaft 3 and the gear of the camshaft (not shown),
Set with a tensioner so that the crankshaft 3 and camshaft rotate in synchronization with the predetermined valve timing.

Further, in the embodiment described above, a matching mark for setting the ignition timing is provided on the crankcase cover 2, and the ignition timing is similarly positioned using the matching mark engraved on the rotor.

(Effects of the invention) As mentioned above, this invention involves inserting an elastic cap into the adjustment window for adjusting the ignition timing or valve timing provided on the crankcase cover, and pressing and holding this elastic cap with a soundproof cover. During maintenance, the elastic cap can be easily attached and detached without using any special tools. Furthermore, this elastic cap is held by being pressed against the soundproof cover, so there is no risk of it falling off. On the other hand, the soundproof cover that presses against the elastic cap is supported by the elastic force of the elastic cap, and vibrations caused by engine drive are reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a power generation device to which this invention is applied, and FIG. 2 is a side view of the power generation device with a part of the soundproof cover cut away. A... Generator, 1... Crankcase, 2...
...Crankcase cover, 3...Crankshaft, 1
4... Rotor section, 15... Stator section, 24, 2
5... Match mark, 26, 27... Adjustment window, 28,
29...Elastic cap, 30...Soundproof cover.

Claims (1)

[Scope of utility model registration request] The rotor part fixed to the end of the crankshaft and the crankcase cover to which the stator part is fixed are provided with matching marks for adjusting the ignition timing or valve timing, and are provided with an adjustment window to make the matching marks coincide. A power generation device for an engine in which a soundproof cover is provided on a crankcase cover, wherein an elastic cap is inserted into the adjustment window, and the elastic cap is pressed and held by the soundproof cover.