JPS6141982Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a device for attaching a distributor to a crankcase, and in particular, it is difficult for ordinary users to readjust the ignition timing without permission. The present invention relates to a mounting device.

[Conventional technology]

By the way, ignition timing has a large effect on the generation of CO, HC, and NOx, which are harmful components in exhaust gas that cause air pollution, so adjustments should not be made indiscriminately, but rather should be adjusted at production or maintenance plants. It is convenient for general users to be unable to make adjustments except for proper adjustments, and it is necessary to prevent users from making unnecessary adjustments.

Examples of prior art in which such adjustment is not possible include Japanese Utility Model Application Publication No. 54-133201;
Japanese Patent Application Laid-open No. 54-113751 discloses that a distributor is mounted directly on a mounting plate fixed to the engine body with bolts or directly on the engine body through long holes in its mounting flange. When a predetermined tightening torque or more is applied through the tightening head, the tightening head is fixed by an irreversible screw that is severed from the narrowed part at the front and disappears.
It is now impossible for general users to adjust the ignition timing of the distributor.

[Problem that the invention attempts to solve]

However, according to the above prior art example, when readjusting the ignition timing at a repair shop etc.
It is necessary to release the fixation of the distributor to the mounting plate or the engine body by the bolts mentioned above, but since there is no head for tightening, this work is extremely troublesome and time-consuming, and the bolts and screws are There are problems such as there is a high risk of damaging the matching mounting plate or the internal threads of the engine body.

The present invention was proposed in view of the above-mentioned circumstances, and the ignition timing of the distributed distributor is improved so that the ignition timing can be easily and easily adjusted during maintenance work at the factory, but it is difficult for general users to adjust the ignition timing. It is an object of the present invention to provide a timing adjustment prevention mounting device.

[Means for solving problems]

To this end, the present invention locates the screw members that secure the mounting plate to the crankcase in a small space that can be removed using a special tool, and fastens the flange of the distributor to the mounting plate. The member is composed of an irreversible screw and a lock plate that is screwed into the lock plate, and the lock plate is connected to the mounting plate via a locking member that is prevented from coming off by a crankcase, etc., and is configured to prevent its rotation. It is characterized by:

〔Example〕

Hereinafter, the present invention will be specifically explained based on an embodiment shown in the drawings.

1 and 2 show a state in which the distributor 3 is attached to the mounting boss 2 of the crankcase 1. The upper surface of the boss 2 has an insertion hole 5 for the distributor shaft 4. A mounting plate 6 having a mounting plate 6 is mounted with bolts 7,
On this mounting plate 6, the distributor 3 is fixed by joining its mounting flange 8 with a fastening member 9, which will be described later.

Here, the fixing bolt 7 of the mounting plate 6 is
is located on the crankcase 1 on the side where the intake manifold, carburetor, etc. are arranged, in a small space surrounded by the distributor 3 main body and the crankcase boss 2, and the distributor 3 is installed in the small space surrounded by the distributor 3 main body and the crankcase boss 2. In this state, it is difficult to remove using a standard tool such as a spanner, and a special tool is required to loosen the bolt 7.

As shown in FIG. 3, the mounting plate 6 has an insertion hole 5 for the distributor shaft 4 in the center thereof, and an insertion hole 1 for the bolt 7 on both sides thereof.
The bolt insertion hole 11 facing the mounting flange 8 of the distributor 0 and the distributor 3 is arranged in a long plate shape in a substantially straight line, and the portion having the bolt insertion hole 11 protrudes outward from the mounting boss portion 2. ing. On the other hand, as shown in FIG. 4, the mounting flange 8 of the distributor 3 extends in a fan-shape to the projecting side of the mounting plate 6, and has a concentric elongated hole 12 at a location corresponding to the insertion hole 11 of the mounting plate 6. It can be rotated at a predetermined angle around the distributor shaft 4 and fixed to the mounting plate 6 with screws, and these structures are substantially the same as those of the conventional one.

Next, the mounting plate 6 and the mounting flange 8
The fastening member 9 will be explained.

The mounting plate 6 has a nut 13 on its bottom surface.
A lock plate 14 is fixed by welding, and an irreversible bolt 15 is inserted into the bolt insertion hole 11 via the lock washer 16 and the elongated hole 12.
The mounting flange 8, mounting plate 6 and lock plate 14 are integrally fixed by screwing into the nut 13.

Here, the irreversible bolt 15 has a bolt head having a hexagonal spanner hook part 17 and a circular collar part 1.
8 and upper and lower portions are separated via a thin neck portion 19, and the neck portion 19 is designed to be screwed off when the tightening torque applied to the spanner hook portion 17 reaches a predetermined value or more.

A locking foot 21 having a bolt insertion hole 20 is provided on the lower surface of the mounting plate 6 and protrudes downward along the outer periphery of the mounting boss 2 at a predetermined distance. A space is secured between the two outer circumferences to accommodate the head of the locking bolt 22 that is inserted into the insertion hole 20. On the other hand, the lock plate 14 is formed with a connecting piece 23 that extends toward the locking leg 21 and has its tip bent at a substantially right angle to follow this, and is provided with a female threaded hole 24 into which the locking bolt 22 is screwed. There is. Here, the total length (L) of the locking bolt 22 is such that the effective threading length l of the threaded portion of the locking bolt 22 with the coupling piece 23 is determined by the distance (e) between the head of the locking bolt 22 and the outer periphery of the mounting boss portion 2. is also longer than the distance (E) between the head and the distributor shaft 4. Therefore, when the mounting plate 6 is fixed to the mounting boss 2, the locking bolt 22 Even if the connecting piece 23 is loosened, the locking of the coupling piece 23 is not released, and the locking is released only when the bolt 7 is removed using a special tool and the mounting plate 6 is removed from the crankcase.

In the distributor mounting device configured as described above, prior to fixing the mounting plate 6 to the mounting boss portion 2, the coupling piece 23 is fixed to the locking foot 21 with the locking bolt 22, and the mounting plate 6 is fixed to the locking foot 21 with the locking bolt 22. and the lock plate 14, and in this state, fix the mounting plate 6 to the mounting boss 2 with bolts 7 using a special tool,
Install the distributor 3.

After the ignition timing has been adjusted, the distributor 3 and the mounting flange 8 are fixed to the mounting plate 6 using irreversible bolts 15 and nuts of the lock plate 14. At this time, a tightening torque of a predetermined value or more is applied to the spanner hook part 17 of the irreversible bolt 15 to thread the neck part 19. In this attached state, the irreversible bolt 15 loses the spanner hook 17, and the lock plate 14 is integrated with the attachment plate 6 by the locking bolt 22 which is prevented from coming off by the attachment boss 2. That nut 1
3. Since rotation in the loosening direction is prevented, the fastening between the mounting plate 6 and the mounting flange 8 cannot be loosened.

If the user dares to readjust the ignition timing, it will be necessary to loosen the bolt 7 and move the mounting plate 6 upward in order to release the interference of the mounting boss 2 with the locking bolt 22. is located in a location that is difficult to access with standard tools, making it virtually impossible for the user to adjust the ignition timing.

When readjusting the ignition timing at a repair shop, the work may be difficult, but loosen the bolts 7 using a special hex wrench or other tools, move the mounting plate 6 upwards, and remove the locking bolts. 22 to eliminate the interference of the crankcase mounting boss portion 2 with the crankcase mounting boss portion 2. In this state, the locking bolt 2 is not interfered with by the distributor shaft 4 and can be unscrewed from the female screw hole 24, so that the lock plate 14
Since the nut 13 can be rotated in the loosening direction with respect to the irreversible bolt 15, the screwing with the bolt 15 can be removed.

When readjusting the ignition timing, first attach the lock plate 14 with the locking bolt 22 and then tighten the plate 6.
This mounting plate 6 is fixed to the mounting boss part 2 with bolts 7, and the distributor 3 is assembled.After that, the main body of the distributor 3 is attached to the mounting plate 6 a predetermined number of times. Do it by moving. Then, attach the mounting flange 8 of the distributor 3 to the mounting plate 6.
When fixing to the holder, a new irreversible bolt 15 with a spanner hook 17 is used to tighten and fix it, and the spanner hook 17 is threaded to prevent its removal.

In addition, in this embodiment, the lock plate 14
used a nut 13 fixed by welding,
As shown in FIG. 5, a female threaded hole 25 for screwing into the irreversible bolt 15 may be directly provided. Also, a female screw hole 24 provided in the coupling piece 23 of the lock plate 14 is provided.
may be a tapered pin hole 26 as shown in FIG. 6, in which case a tapered pin 27 is used instead of the locking bolt 22.

Furthermore, as shown in FIG. 7, the nut member may be constructed as a separate member from the lock plate 14, and the lock plate 14 may function as a cover to prevent the nut member from being attached or detached while being fixed to the mounting plate 6. In this case, a square nut 28 is used as the nut member in consideration of preventing rotation of the nut member, and as shown in FIG.
form 9.

[Effect of idea]

Thus, according to the present invention, the work of removing the mounting plate requires a special tool and is relatively difficult, and the fixation between the flange of the distributor and the mounting plate cannot be released while the mounting plate is attached. Adjustment of the ignition timing can be made virtually impossible for general users, except when working at a maintenance shop or the like.

When adjusting the ignition timing at the repair shop,
After removing the screw member that fixes the mounting plate to the crankcase using a special tool, remove the plate.
After the locking member of the locking plate has moved to a position where it is not prevented from coming out by the crankcase or other immovable member, the locking member that fixes the locking plate to the mounting plate is removed, and the locking plate is rotated in the loosening direction to tighten the screw with the irreversible screw. After removing the lock plate from the locking member, fix the mounting plate to the crankcase with a screw member using a special tool, and then rotate the distributor body to the specified angle relative to the mounting plate to return to its new position. The ignition timing can be easily and simply fixed by fixing it with a suitable irreversible screw.

[Brief explanation of drawings]

FIG. 1 is a view in the direction of arrows showing the position of a distributor to which the present invention is applied; FIG. 2 is a side view with a part of the mounting device in cross section showing an embodiment of the present invention;
Figure 3 is a top view of the mounting plate, Figure 4 is the top view of the mounting plate.
FIGS. 5 to 7 are cross-sectional views showing other embodiments of the lock plate, and FIG. 8 is a cross-sectional view taken along B-B in FIG. 7. 1...Crankcase, 2...Mounting boss part,
3...Distributor, 4...Distributor shaft, 6...Mounting plate, 7...
Bolt, 8... Mounting flange, 13... Nut, 14... Lock plate, 15... Irreversible bolt, 21... Locking foot, 22... Locking bolt, 2
3...Connection piece.

Claims (1)

[Scope of utility model registration request] When installing the distributor to the crankcase, the mounting flange of the distributor is attached to the mounting plate screwed to the crankcase using slotted holes, and the rotation of the distributor body can be adjusted relative to the distributor shaft. In the mounting device, the screw member that fixes the plate to the crankcase is
A lock plate that is disposed in a small space that can be removed using a special tool, and that integrates at least an irreversible screw and a female threaded member that is screwed into the lock plate as a fastening member that fixes the mounting flange to the mounting plate. and the lock plate is connected to the mounting plate via a locking member that is prevented from coming off by the crankcase or other immovable member, and is configured to prevent rotation of the mounting plate. Ignition timing adjustment prevention mounting device.