JPS58102816A - Revolution preventive ensuring mechanism of regulating screw - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The disclosed technology belongs to the technical field of a cap removal prevention mechanism that prevents a user from turning an idle air-fuel ratio adjusting screw or the like of an automobile engine.

Therefore, the present invention prevents the user from intentionally rotating the spatula P of an adjustment screw such as an idle air-fuel ratio adjustment screw or an idle port P adjustment screw screwed into the fuel passage of the automobile engine, and also prevents the user from removing it. The invention relates to an anti-rotation guarantee mechanism designed to ensure factory adjustment, and in particular, an inwardly protruding elastic hook that supports an anti-rotation cap that is rotatably fitted to the head to ensure adjustment of the head. The hook is loosely inserted into the rotation groove, and the hook is engaged with a round hole formed in the adjustment rotation groove through a vertically elongated groove to allow rotation of the cap and prevent it from being removed. This invention relates to an adjustment screw rotation prevention guarantee mechanism that is made breakable by a plurality of notches on the cap top cover.

As is well known, automobile engines are equipped with various adjusting screws. For example, as shown in FIG. The manufacturer or service factory uses test and inspection equipment to correctly set the idle position at the optimal idle position before handing it over to the market or to the user.

However, since the adjustment screw 3 is generally exposed in the engine room, the user cannot access the adjustment rotation groove 5 of the head 4.
Currently, it is not possible to engage the driver and make adjustments freely and arbitrarily.

Therefore, the optimal driveability of the engine adjusted and set at the factory is deteriorated, the exhaust gas treatment is also impaired, drivability is reduced, and harmful gases are emitted.

On the other hand, regulations have become stricter from the viewpoint of safety related to vehicle speed and pollution problems related to exhaust gas, etc., and if inspection results show nonconformity, improper idle air fuel ratio and idle speed The trend is for the responsibility of the automaker's Inibis factory to fall.

Therefore, it is desirable for automobile manufacturers and service shops to be able to guarantee that after setting the adjusting screw to -H, the optimum setting state is maintained at least in a manner that can withstand the consequences of the liability.

To deal with this, as shown in Japanese Patent Publication No. 54-11857, as shown in FIG.
A technique has been devised in which a resin cap 6 is loosely fitted onto the cap 4, and an inward hook 7 formed on the lower edge of the circumferential side is used to prevent the cap from being removed.

However, in this type of technology, it is possible to prevent the user from adjusting the adjustment screw 3, that is, although the initial set guarantee can be obtained, it is difficult to repeat the adjustment during regular inspections such as vehicle inspections or desired irregular inspections. When adjustment is required, there is a problem in that it is difficult to remove the cap 6 due to the hook 7 provided at the lower end of the circumferential side, and in particular, a mode in which the locking at room temperature is strengthened so that the user does not easily remove the cap 6 is required. On the other hand, there was a problem in that it took time and effort to heat-fit, cool, and latch.

Also, in order to make the head 4 tapered to make it easier to remove,
This also had the disadvantage of requiring a large number of processes and requiring high precision, resulting in high costs.

The purpose of the present invention is to solve the problem of preventing the rotation of the cap from the adjustment screw based on the above-mentioned conventional technology, and to solve the problem of preventing the rotation of the cap from the adjustment screw head. It is easy to fit loosely by engaging the protruding hook, and it is also easy to remove and dismantle through the multiple notches on the top cover, which prevents user manipulation and allows readjustment to be performed without difficulty. It is an object of the present invention to provide an excellent mechanism for ensuring that the adjustment screw does not rotate.

The structure of the present invention in accordance with the above-mentioned object is to loosely fit a covered cylindrical cap onto an adjustment screw that has been set to an optimum state at the factory, and loosely insert the inwardly protruding hook into the adjustment rotation groove of the adjustment screw. The plurality of longitudinally divided grooves of the hook are locked into the round hole in the adjustment rotation groove via an elastic compression springback, and the cap is fitted onto the spatula P so as to be rotatable, and the user is prevented from removing the adjustment screw. to prevent rotational adjustment of the
Therefore, when readjusting during inspection, it is easy to remove elastically due to the width of the flexible part of the cap other than the round hole retaining hook, or it can be broken due to the multiple notches on the top cover of the cap. The main purpose of this invention is to make it easy to readjust.

Next, an embodiment of the present invention will be described below based on the drawings from FIG. 3 onwards. Note that parts having the same features as those in FIGS. 1 and 2 will be described with the same reference numerals.

In the embodiment shown in FIGS. 6 and 7, reference numeral 31 is an adjustment screw for adjusting the idle air-fuel ratio, and the head 41 has a round hole 8 at the bottom of the adjustment rotation groove 5 along the groove 5. On the other hand, 61 is a closed cylindrical cap made of low-strength brittle synthetic resin such as Duracon, and as shown in FIG. is integrally extended with a bottle 9 having a width diameter slightly smaller than that of the adjusting rotation groove 5, and the tip thereof is formed by three longitudinally dividing grooves 10, 10, 1.
A three-pronged elastic hook 11 with 0 is also integrally molded.

In addition, a groove ring-shaped recess 12 is formed in the circumferential direction of the upper lid 61', and window-shaped notches 13, 13. 62'', three grooves 14, 14, 14° are formed between the notches 13, 13.13.

In the above configuration, the idle air-fuel ratio is adjusted to an optimum state using an inspection device at an automobile factory or a service shop, and after the adjusting screw 31 is set, the cap 61 is loosely fitted onto the head 41.

In the process, the elastic hook 11 is inserted into the bifurcated bullet splitting groove 10.
10 and 10 into the adjustment rotation groove 5, and when it reaches the round hole 8, it springs back and is stopped from being pulled out, and the cap 61 is placed in a loosely fitted state.

Therefore, even if the user attempts to adjust the adjustment screw 31 thereafter, the adjustment rotation groove 5 is covered by the cap 61, making it impossible to use a screwdriver, etc.
1 is simply rotated and cannot be easily removed, so that the initial adjustment set state is reliably maintained.

In the above-mentioned embodiment, the round hole 8 is drilled along the bottom of the adjusting rotation groove 5 of the screw 31 from the side.
9. As shown in the embodiment shown in Fig. 10, a round hole 8 is drilled at the circumference of the head 41 slightly below the bottom of the adjusting rotary screw 5 and perpendicular thereto, and a tapered insertion hole 8' is inserted from the center of the cap 61. In addition, as shown in Fig. 11.12.13, a window-shaped notch 131. It is also possible to use the perforated embodiment.

In these cases, the function and effect of the cap fitting and the user's inability to adjust it remain the same.

In each of the above-mentioned embodiments, for example, the adjustment screw 3 may be removed during periodic inspection, etc.
1, it is sufficient to hook the lower end of the cap 61° 611 and forcefully pull it out. In this case, a special jig such as a three-pronged hook may be used, but the 61°611 can be broken with pliers or the like.

That is, a ring-shaped recess 12 and window-shaped notches 13, 13...
.

By providing 131.131, the peripheral side 61'.

By providing grooves 14 and 141 in 621, the upper lid 61
', 611, there are weak spots on the peripheral sides 61'', 621, so when adjusting the cap 61.6 with a jig such as pliers,
11 can be destroyed to expose the spatula l'41 of the screw 31.

It goes without saying that the embodiments of the present invention are not limited to the above-mentioned embodiments; for example, as shown in FIG. A wide variety of configurations can be adopted, such as a glass screw groove or a double cap that can be rotated relative to each other.

Of course, the target adjustment screw can be applied to any adjustment screw with an exposed head, such as an idle speed adjustment screw, in addition to the idle air-fuel ratio adjustment screw.

As described above, according to the present invention, the head exposure adjustment screws such as the idle air-fuel ratio adjustment screws are basically set to the optimum condition at the factory, and then the general user is prevented from adjusting them, and the cap is removed. It simply rotates freely and cannot be removed easily, so the factory set adjustment state is maintained reliably.
The air-fuel ratio and exhaust gas concentration are maintained and guaranteed as set, producing excellent results.

Furthermore, when readjusting during periodic inspections or the like, it can be easily removed and destroyed at the factory, and the adjusting screw can be rotated normally.

The cap is loosely supported through an adjustment rotation groove drilled in the head of the adjustment screw by engaging an inwardly protruding elastic hook having a longitudinally slotted groove in a round hole provided at the bottom of the cap.
Because it is supported at one point, it is easy to rotate, and even if the user tries to remove it, the user cannot easily rotate it and remove it easily.On the other hand, when adjusting the adjustment screw in a factory, etc. The adjusting screw can be easily removed or destroyed by hooking it to multiple notches on the top cover of the cap or the lower edge of the cap using a jig, and then pulling it off through the thin part of the notch or the window opening. This has the effect of exposing and adjusting the information.

Since the cap inserts and engages the elastic hook of the adjustment rotation serial number, an excellent effect can be achieved in that the adjustment screw is doubly prevented from clogging the adjustment rotation groove, etc. together with the cap.

In addition, if the user forcibly destroys the cap, the adjustment screw will be exposed, and as a capless product, it will be a kind of seal breaking, and it will prove to the contrary that the manufacturer is not covered by the warranty. In addition, the round hole to be drilled in the head of the adjustment screw can be made without difficulty by drilling, etc., and there is no need to perform tapering of the head, etc., so the number of man-hours required for machining can be reduced, and the accuracy does not require high precision. There is also the advantage that costs can be kept low because there is no need to do so.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the setting state of the adjustment screw, Fig. 2 is an explanatory diagram of the adjustment screw rotation prevention guarantee mechanism based on the conventional technology, and Fig. 6 is an explanatory diagram of the setting state of the adjustment screw.
The following figures are detailed explanatory drawings of the present invention, Fig. 3 is an explanatory drawing of the adjustment screw and cap of one embodiment, and Fig. 4 is a plan view of the same cap, and Fig. 5 is a side explanatory view of the same. Fig. 6 is an explanatory bottom view of the same head, Fig. 7 is an explanatory cross-sectional view of Fig. 5 - ■, Fig. 8 is an explanatory side view of another embodiment of the adjustment screw, and Fig. 9 is an explanatory plan view of the same head. , Fig. 10 is an explanatory cross-sectional view taken along the line X-X in Fig. 8, Fig. 11 is an explanatory plan view of a cap of another embodiment, Fig. 12 is an explanatory cross-sectional view taken along Fig. 11 ■-■, and Fig. 16 is a bottom view of the same. A visual explanatory view, FIG. 14 is a hook cross-sectional explanatory view of another embodiment. 2... Passage, 31... Adjustment screw, 41
...Head, 61,611...Cap,
5...Adjustment rotation groove, 8...Round hole, 61', 61
1...Top lid, 62", 611...Side (peripheral) surface,
10... split groove, 11,111... hook,
13.131... Notucci Applicant Toyota Motor Corporation No. 1II 2nd WJ Figure 8 Figure 51 Figure 1°

Claims (1)

[Claims] A guarantee mechanism for preventing a cap rotatably and loosely fitted into the head of an adjustment screw installed in the engine fuel passage from being removed, wherein a round hole is formed in the adjustment rotation groove of the head of the adjustment screw, On the other hand, a cap covering the top and side surfaces of the hilt is attached to the head through an inwardly protruding hook having a plurality of longitudinal grooves that elastically engage with the round hole, and is attached to the head through the hook. An adjustment screw rotation prevention mechanism, characterized in that a plurality of notches are formed in the upper lid of the cap.