JPH021461Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an indicator scale adjustment device for an internal combustion engine.

Generally, internal combustion engines are equipped with an indicating scale adjustment device to confirm that a particular piston is located at top dead center. A conventional indicator scale adjustment device, as disclosed in, for example, Japanese Utility Model Application Publication No. 57-92835, has an indicator scale part provided on a part of the outer peripheral surface of the flywheel and a viewing opening formed in the flywheel housing. The viewing opening is formed at the upper part of the outer surface of the flywheel housing so that the indication scale can be easily seen when adjusting the assembly of the internal combustion engine.

In an internal combustion engine equipped with such an indicator scale adjustment device, the indicator scale can be easily seen through the visual opening during assembly work, but after assembly, auxiliary parts are disposed above the visual opening. If it is installed, it cannot be seen through this viewing opening, and the above-mentioned auxiliary parts must be removed in order to visually check the indicator scale, which worsens maintenance workability after assembly (especially if the indicator scale is not visible). There was a problem that the work to visually check the scale part was complicated.

Therefore, it may be considered to change the position of the above-mentioned visual opening in consideration of maintenance workability after assembly, but in this case, as can be easily understood from the above description, workability during assembly will deteriorate. Therefore, considering the workability during assembly and maintenance workability after assembly, indicator scales are simply provided at two locations on the flywheel, and two indicator scales are provided on the flywheel housing corresponding to the indicator scales. It is also possible to form separate visual apertures, but in this case, it would be difficult to determine which of the sighting plates attached to the apertures of the visual aperture each indicator scale corresponds to. .

The present invention has been made in view of the above facts, and its purpose is to provide an improved indication scale adjustment device for internal combustion engines that has excellent workability during assembly and maintenance workability after assembly. It is.

According to the present invention, a plurality of indicator scale parts provided at predetermined intervals on the outer peripheral surface of the flywheel and provided with indicator scales, and a flywheel housing corresponding to each of the plurality of indicator scale parts. and a sighting plate attached to each of the formed viewing apertures, and each of the sighting plates is configured to read one of the plurality of indication scales through the viewing aperture to which the sighting plate is attached. There is provided an indicator scale adjustment device for an internal combustion engine, characterized in that it is configured such that only a specific indicator scale portion is visible.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an internal combustion engine indicator scale adjustment device constructed according to the present invention will be described in detail with reference to the accompanying drawings. Referring to FIG. 1, a flywheel housing 4 is attached to an internal combustion engine main body 2, and a flywheel 8 to which a gear 6 is fixed is disposed within the flywheel housing 4. Although not shown, the flywheel 8 is fixed to one end of the crankshaft. A protrusion 8a is formed on the outer peripheral surface of the flywheel 8 over the entire circumference, and a first indicator scale part 10 and a second indicator scale part are formed on a part of the protrusion 8a at a predetermined interval. 12 are provided. In the specific example, the first indicator scale part 10 and the second indicator scale part 12 are located at opposite positions (that is, substantially 180 degrees apart) and laterally (left-right direction in FIG. 1). At a slight interval (more specifically, the first indicator scale part 10 is provided on one edge of the protrusion 8a, and the second indicator scale part 12 is provided on the other edge of the protrusion 8b). provided) provided. The first indicator scale section 10 and the second indicator scale section 12 each include:
An indicator scale (in a specific example, indicated by the symbol T/C as shown in FIGS. 2-A and 2-B) that indicates the angle of a specific piston position of the internal combustion engine (for example, the piston position of the first cylinder) ) has been applied.

On the other hand, the outer circumferential wall of the flywheel housing 4 is provided with a first visual recognition opening 14 and a second visual recognition opening each having a substantially rectangular shape corresponding to the first indication scale part 10 and the second indication scale part 12. 16 are formed. (Therefore, the first viewing opening 14 and the second viewing opening 16 are also formed at opposite positions). And flywheel housing 4
The first sighting plate 1 which constitutes a part of the indicator scale adjustment device in relation to the first indicator scale section 10 is located at the opening of the first visual aperture 14 formed in the upper part of the indicator scale section 10.
8 is attached, and a second visual recognition opening 16 formed at the lower part of the flywheel housing 4 has a second visual confirmation opening 16 formed in the lower part of the flywheel housing 4. Two aiming plates 20 are attached.

Next, referring to FIG. 1 as well as FIGS. 2-A and 2-B, the first aiming plate 18 and the second aiming plate 20
I will explain about it. The first aiming plate 18 has a main body portion 18a having a rectangular opening 22 formed approximately in the center thereof.
a hanging portion 18b extending substantially vertically inward from one inner end (right end) of the left portion of the main body portion 18a;
The pointer portion 18c extends from the lower end of the pointer b toward the first indicator scale portion 10 of the flywheel 8 to the right in FIGS. 1 and 2-A. The first aiming plate 18 is assembled by screwing mounting bolts 24 onto the flywheel housing 4 through holes formed at both ends of the main body 18a.
It is fixed to the flywheel housing 4.
In relation to this first aiming plate 18, a first aiming plate 1
When the pointer section 18c of 8 and the indicator scale provided on the first indicator scale section 10 of the flywheel 8 match, the piston (not shown) of a specific cylinder (for example, the first cylinder) of the internal combustion engine Positioned at top dead center. The second sighting plate 20 also has a main body portion 20a in which two rectangular openings 26 are formed on both sides.
, a hanging portion 20b extending substantially vertically inward from the left end of the intermediate portion of the main body portion 20a, and a second indication scale of the flywheel 8 extending from the lower end of the hanging portion 20b to the left in FIGS. 1 and 2-B. The pointer portion 20c extends toward the portion 12. The second sighting plate 20 is fixed to the flywheel housing 4 by screwing mounting bolts 28 onto the flywheel housing 4 through holes formed at both ends of the main body portion 20a. In relation to this second sighting plate 20, a pointer portion 20c of the second sighting plate 20 and a second indicating scale portion 1 of the flywheel 8 are provided.
2, the piston (not shown) of the specific cylinder of the internal combustion engine is positioned at the top dead center.

In the above-mentioned indicator scale adjustment device, during assembly, the first indicator scale of the flywheel 8 is adjusted through the first visual recognition opening 14 formed in the flywheel housing 4 and the opening 22 formed in the first aiming plate 18. When the indicator scale provided on the first indicator scale part 10 cannot be visually recognized as described above during maintenance work after assembly, etc., the flywheel housing The indicator scale provided on the second indicator scale portion 12 of the flywheel 8 is visually recognized through the other second viewing aperture 16 formed in the second sight plate 4 and the opening 26 formed in the second sight plate 20. . When viewing through the first viewing aperture 14, only the first indication scale portion 10 is visible through the opening 22 of the first sight plate 18, as can be easily understood from FIG. 2-A. (Since the left part of the main body part 18a of the first aiming plate 18 is located above the movement path of the second support scale part 12 and covers the movement path, as shown by the broken line in FIG. 2-A, (in other words, the pointer part 18c of the first aiming plate 18 and the indicator scale part that is visible through the opening 22 of the first aiming plate 18). The piston (not shown) of the specific cylinder can be brought to the top dead center by simply aligning the indicator scale of the first indicator scale part 10), which is the specific indicator scale part corresponding to the first aiming plate 18. can be positioned. still,
When the pointer portion 18c of the first sighting plate 18 and the indication scale of the first indication scale portion 10 are made to match, as can be easily understood from the above description, the second sighting plate 2
The indication scale of the 0 pointer section 20c and the second indication scale section 12 are also made to match. In addition, when viewing through the second viewing aperture 16, as easily understood from FIG. 2-B, the opening 26 of the second sighting plate 20 (in the specific example, the Only the second indicator scale part 12 can be visually seen through the opening (where the main body part 20 of the second aiming plate 20 is located).
Since the middle part of the second indicator a is located above the first indicator scale part 10 and covers the movement path, the second -
(not visible through the opening 26 of the second aiming plate 20 as shown by the broken line in FIG. By simply matching the indication scale of the scale part (in other words, the second indication scale part 12 which is a specific indication scale part corresponding to the second indication aiming plate 20), the piston of the specific cylinder (see FIG. (not shown) can be positioned at top dead center.

As described above, in the above-mentioned indicator scale adjustment device, visual confirmation apertures are formed in two places, and the pointer part of the aiming plate and the indicator scale part that can be visually seen through the opening of the aim plate are formed through either of the visual confirmation apertures. Since the piston of a specific cylinder can be positioned at top dead center by matching the indication scale, workability during assembly of the internal combustion engine and maintenance workability after assembly are improved. The work is also extremely easy.

In the specific example described above, two viewing openings are provided at positions opposite to each other, but one viewing opening is formed at an appropriate position on the flywheel housing in consideration of workability during installation, and the other opening is formed at an appropriate position on the flywheel housing. A viewing opening can be formed at an appropriate position in the flywheel housing in consideration of maintenance workability after installation. In this case, one indicator scale may be provided corresponding to one of the visual apertures, and the other indicator scale may be provided to correspond to the other visual aperture.

Further, in the specific example described above, two visual apertures are formed and indication scales are provided at two locations on the flywheel corresponding to the visual apertures, but the present invention is limited to such a specific example. It is also possible to apply the present invention to a device having indicator scale portions at three or more locations. In this case, a visual aperture is provided corresponding to the indication scale section, and each of the sighting plates attached to the opening of the visual aperture is inserted through the visual aperture to which the sighting plate is attached so that a specific instruction can be obtained. What is necessary is just to configure so that only the scale part can be visually recognized.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a portion of an internal combustion engine equipped with an indicator scale setting device constructed in accordance with the present invention. Figures 2-A and 2-B respectively show the relationship between the first indicator scale part and second indicator scale part of the flywheel and the first aiming plate, and the relationship between the first indicator scale part and the second indicator scale part of the flywheel. FIG. 2 is a diagram showing the relationship between the second indicator scale portion and the second aiming plate. 4... Flywheel housing, 8... Flywheel, 10... First indicator scale section, 12...
...second indicator scale section, 14...first visual recognition aperture, 16...second visual recognition aperture, 18...first sighting plate, 20...second sighting plate.

Claims (1)

[Claims for Utility Model Registration] A plurality of indicator scales provided at predetermined intervals on the outer peripheral surface of the flywheel and provided with indicator scales, and a flywheel that corresponds to each of the plurality of indicator scales. and a sighting plate attached to each of the viewing apertures formed in the housing, each of the sighting plates being able to read the plurality of indication scales through the viewing aperture to which the sighting plate is attached. 1. An indicator scale adjustment device for an internal combustion engine, characterized in that the indicator scale adjustment device for an internal combustion engine is configured such that only a specific indicator scale part of the parts is visible.