JP2909869B2 - Engine fuel limiting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel limiting device for an engine, and more particularly, to a device capable of preventing a user from adjusting a fuel limiting bolt.

[0002]

2. Description of the Related Art FIG. 4 shows a prior art of a fuel limiting device for an engine. This has the following basic structure as in the present invention. That is, a fuel limiting bolt 102 is screwably attached to a bolt attaching portion 101 of the engine, a tool engaging portion 104 is provided at a bolt base end 103 of the fuel limiting bolt 102, and a bolt tip portion of the fuel limiting bolt 102 is provided. It is configured so that the fuel can be restricted in accordance with the position of the advancing and retreating 105.

In the vehicle having such a basic structure, the forward / backward position of the bolt tip 105 is adjusted by screwing the fuel limiting bolt 102, and, for example, the governor lever (not shown) swings in the fuel increasing direction. By restricting the movement, the fuel injection amount of a fuel injection pump (not shown) can be limited.

In this prior art, a cap nut 118 is removably mounted on a bolt base end 103 of a fuel limiting bolt 102, and the cap engaging nut 118 covers a tool engaging portion 104 of the fuel limiting bolt 102. .

[0005]

The above prior art has the following problems. That is, the manufacturer sets the fuel limit bolt 1
02, even if an engine that can be adjusted to the exhaust gas regulation by adjusting other adjustment parts is shipped, the user removes the cap nut 118 and removes the tool engagement portion 104 in order to increase the output.
May be exposed and the fuel limiting bolt 102 may be screwed and adjusted without permission. In this case, the fuel limit may exceed the appropriate range, and the engine may be changed to one that does not comply with exhaust gas regulations.

An object of the present invention is to provide a fuel limiting device for an engine which can prevent a user from adjusting a fuel limiting bolt.

[0007]

[Means for Solving the Problems]

(First Invention) In a first invention, as shown in FIG. 1, a fuel limiting bolt 2 is screwably mounted on a bolt mounting portion 1 of an engine, and a bolt base end 3 of the fuel limiting bolt 2 is provided.
In the fuel limiting device for an engine, the fuel limiting device is provided with a tool engaging portion 4 so that the fuel can be limited in accordance with the position of the bolt tip 5 of the fuel limiting bolt 2. Features.

That is, an annular retaining locking member 6 is externally fitted to the bolt base end 3 of the fuel limiting bolt 2, and this retaining locking member 6 is immovable in the axial direction of the fuel limiting bolt 2. The fuel locking bolt 2 is fixed so that the bolt tip 5 side is the front side and the bolt base end 3 side is the rear side.
The locking member peripheral side surface 8 is formed in a tapered shape expanding toward the front side, and an inward engaging claw 10 is provided on a sealing cap 7 for sealing the tool engaging portion 4 of the bolt base end 3. ing.

Then, the sealing cap 7 is pushed into the retaining locking member 6 from the rear side while being externally fitted thereto.
The engaging claw 10 is put on the locking body peripheral side surface 8 while at least one of the retaining locking body 6 and the engaging claw 10 is elastically deformed. The engaging claw 10 that has passed over the locking body peripheral side surface 8 projects to the front side of the retaining locking body 6 due to the restoration of the elastic deformation. It is characterized in that it is configured so as to be blocked by the engaging claw 10 that engages with the front surface 11 of the retaining member 6.

(Second Invention) According to a second invention, as shown in FIG. 1, in the first invention, a lock nut 12 is screwed to the fuel limiting bolt 2 at the front side of the retaining member 6 and The fuel limiting bolt 2 is fixed to the bolt mounting portion 1 with a lock nut 12 so as not to be loosened.
At the rear side, a locking member fixing nut 13 is screwed to the fuel limiting bolt 2, and the fastening force of the locking member fixing nut 13 causes the retaining member 6 to lock the locking nut 12 and the locking member. The gap in the sealing cap 7 is filled with a low-friction elastic filling material 14 which is sandwiched and fixed between the nut 13 and injected into the gap in the sealing cap 7 and solidified. It is characterized in that the sealing cap 7 idles around the retaining lock 6 and the lock nut 13 due to the sliding of the body 14.

(Third invention) According to a third invention, as shown in FIG. 1, in the first invention or the second invention, the sealing cap 7 is replaced with an engaging body 15 having the engaging claw 10, And the engaging body 15 is connected to the cap body 16 by only the connecting pin 17.

[0012]

Actions and effects of the present invention

(First Invention) The first invention has the following effects (see FIG. 1). After the manufacturer adjusts the engine such that the fuel limiting bolt 2 and the like are adjusted to comply with the exhaust gas regulations, etc., and pushes the retaining cap 6 into the retaining locking member 6 while externally fitting the sealing cap 7 from the rear side, the engagement occurs. When the engine is shipped in this state, the user is required to remove the fuel restricting bolt because the claw 10 protrudes to the front side of the retaining lock 6 to prevent the claw 10 from being pulled out to the rear side. The tool cannot be hooked on the second tool engaging portion 4. For this reason, adjustment of the fuel limiting bolt 2 by the user can be prevented, and there is no possibility that the engine will be modified to one that does not comply with the exhaust gas regulations and the like.

The sealing cap 7 is attached in a retaining state by simply pushing the sealing cap 7 into the retaining locking member 6 from the rear side, so that the sealing operation by the manufacturer is easy.

If the user forcibly removes the sealing cap 7, the retaining locking member 6 and the engaging claw 10 are damaged and cannot be repaired, so that the fact of the user's misconduct can be easily confirmed.

(Second Invention) The second invention has the following functions and effects in addition to the functions and effects of the first invention (FIG. 1).
reference). Simply by screwing the locking member fixing nut 13 to the fuel limiting bolt 2, the retaining locking member 6 is fixed, so that the fixing operation can be easily performed.

The gap in the sealing cap 7 is the elastic filler 1
4, the sealing cap 7 and the engaging claw 10 collide with the retaining member 6 and the lock nut 12.
Of the engaging claw 10 is prevented. Therefore, these collision sounds can be eliminated. Further, wear and damage of the retaining locking member 6 and the engaging claw 10 due to the collision are prevented, and the retaining function of the sealing cap 7 can be maintained for a long time.

Since the sealing cap 7 idles due to the sliding of the low-friction elastic filler 14, even if the user turns the sealing cap 7, the retaining locking member 6 and the locking member fixing nut 13 rotate together. Therefore, the locking body fixing nut 13 does not loosen. For this reason, there is no possibility that the user may hinder the function of preventing the sealing cap 7 from coming off.

(Third Invention) The third invention has the following function and effect in addition to the function and effect of the first invention or the function and effect of the second invention (see FIG. 1). After the engine has been shipped, the manufacturer
In the case of adjusting again, it is possible to separate the engaging body 15 from the cap body 16 and remove the cap body 16 by cutting only the connection pin 17 without cutting the entire circumference of the sealing cap 7. The re-adjustment work by the manufacturer can be performed quickly. When the user removes the sealing cap 7, the user can easily confirm the fact of the misconduct due to the disappearance of the sealing cap 7.

[0019]

An embodiment of the present invention will be described with reference to the drawings.
1 and 2 are diagrams for explaining an embodiment of the present invention. In this embodiment, a diesel engine is used. In this diesel engine, as shown in FIG. 2, a fuel injection pump 20 is inserted from above into an injection pump case 19 provided on the side of a cylinder block. The injection pump 20 is housed in an upper part in the injection pump case 19. A fuel injection camshaft 21 is provided under the injection pump case 20. A governor accommodating case 22 is attached to the rear side of the injection pump case 19, and a mechanical governor is accommodated therein.

The structure of the mechanical governor is as follows. That is, the governor lever 2 is attached to the governor lever pivot 23.
4 is pivotally supported at its lower end. As the governor lever 24, a two-type governor including a governor force input lever 25 and a spring force input lever 26 is used. A governor weight 28 is provided inside the input gear 27 attached to the tip of the fuel injection camshaft 21. A governor sleeve 29 faces the governor weight 28 from the front side, and a governor force input lever 25 faces the governor sleeve 29 from the front side. There is not. A rack pin 32 of a fuel metering rack 31 of the fuel injection pump 20 is operatively connected to an output end 30 of the governor force input lever 25. The spring force input lever 26 is operatively connected to a speed control lever 34 via a governor spring 33. The spring force input lever 26 faces a torque increasing device 35 provided on the governor force input lever 5 from the front side.

According to this mechanical governor, the governor force 36 generated from the governor weight 28 and the spring force 3 of the governor spring 33 correspond to the rotational speed of the engine.
The fuel metering rack 31 is metered by swinging the governor lever 24 by an unbalanced force with the fuel meter 7,
The engine rotation speed is kept constant irrespective of fluctuations in the load on the engine. In the figure, the front side is the fuel decreasing side of the fuel metering rack 31, and the rear side is the fuel increasing side.

This engine is provided with a fuel limiting device for limiting the amount of fuel increase of the fuel injection pump 20, and its structure is as follows. That is, as shown in FIG. 1, the fuel limiting bolt 2 is attached to the case wall 38 of the governor housing case 22 so as to be freely screwed. The bolt base end 3 of the fuel limiting bolt 2 located outside the governor housing case 22 is provided with a slotted tool engaging portion 4 to be engaged with a driver. As shown in FIG. 2, the bolt tip 5 of the fuel limiting bolt 2 faces the spring force input lever 26 from the rear side.

According to this fuel limiting device, when the spring force input lever 26 comes into contact with the bolt tip 5, the swing thereof is restricted, and the fuel increase of the fuel injection pump 20 is limited. For this reason, when the fuel limiting bolt 2 is screwed and the bolt tip 5 is adjusted forward and backward, the fuel is limited corresponding to the advanced and retracted position.

In this embodiment, in order to prevent the user from adjusting the fuel limiting bolt 2, the following configuration is employed in the fuel limiting device. That is, as shown in FIG. 1, an annular retaining locking member 6 is externally fitted to the bolt base end portion 3 of the fuel limiting bolt 2, and this retaining locking member 6 is positioned in the axial direction of the fuel limiting bolt 2. And is immovable. With the bolt distal end 5 side of the fuel limiting bolt 2 as the front side and the bolt base end 3 side as the rear side, the locking body peripheral side surface 8 of the retaining locking body 6 is formed in a tapered shape expanding toward the front side. .
An inward engaging claw 10 is provided on a sealing cap 7 for sealing the tool engaging portion 4 of the bolt base end 3.

Then, the sealing cap 7 is pushed into the retaining locking member 6 from the rear side thereof while being externally fitted thereto.
The engaging claw 10 is slid on the locking member peripheral side surface 8 while the engaging claw 10 rides on the locking member peripheral side surface 8 and the retaining member is elastically deformed to have a reduced diameter. When the engaging claw 10 passes on the body peripheral side surface 8, the retaining claw 6 is elastically restored, and the locking claw 10 protrudes to the front side of the locking body 6, so that the locking claw 10 is removed to the rear side. Front surface 11 of retaining lock 6
Is prevented by the engaging claw 10 that engages with the first.

According to such a configuration, after the maker adjusts the engine by adjusting the fuel limiting bolt 2 and the like so as to conform to the exhaust gas regulations and the like, the sealing cap 6 is attached to the retaining locking member 6 from the rear side. When pushing in while fitting 7 outside,
When the engine is shipped in this state, since the engaging claw 10 protrudes to the front side of the retaining locking member 6 and the sealing cap 7 is prevented from being pulled backward, the user is required to restrict the fuel due to the presence of the sealing cap 7. The tool cannot be hooked on the tool engaging portion 4 of the bolt 2.

In this embodiment, the sealing cap 7 comprises a bottomed cylindrical cap body 16 and an annular engaging body 15. As the cap body 16, a steel hexagonal bar having a drilled hole along its axis is used. The opening peripheral wall 39 is formed in a thin cylindrical shape whose outer peripheral surface is stepped inward. An annular member made of steel is used for the engagement body 15. The inner peripheral surface 40 of the engagement body 15 is formed in a tapered shape that expands toward the front end opening edge 41 thereof. The rear opening peripheral wall 42 of the engaging body 15 is formed in a thin cylindrical shape whose inner peripheral surface is stepped outward, whereby the engaging pawl 10 is formed on the engaging body 15. The rear peripheral wall 42 of the engagement body 15 is fitted over the peripheral wall 39 of the cap body 16. The engagement body 15 is connected to the cap body 16 only by a connection pin 17 described later. The retaining member 6 is made of an elastically deformable annular member made of synthetic resin.

In order to engage the engaging claw 10 with the retaining locking member 6, the retaining locking member 6 is elastically deformed to have a reduced diameter as in this embodiment, or the engaging claw 10 is expanded. It is necessary to elastically deform in an open state. In order to elastically deform the engaging claw 10 in an expanded shape, the engaging body 15 may be formed of an elastically deformable synthetic resin or the like.

In this embodiment, a lock nut 12 is screwed to the fuel limiting bolt 2 at the front side of the retaining lock 6, and the fuel limiting bolt 2 is loosened by the lock nut 12 on the case wall 38 of the governor housing case 22. A locking member fixing nut 13 is screwed to the fuel limiting bolt 2 on the rear side of the retaining member 6 in the stopped state.
With this fastening force, the retaining locking body 6 is sandwiched and fixed between the lock nut 12 and the locking body fixing nut 13. In this case, the retaining locking member 6 is simply screwed into the fuel limiting bolt 2 to lock the locking member 13.
Is fixed, so that the fixing operation can be easily performed. A cap nut is used as the locking body fixing nut 13.
Incidentally, reference numeral 49 in the drawing denotes a copper packing.

In this embodiment, the gap in the sealing cap 7 is filled with an elastic filler 14 having low friction. The elastic filler 14 is formed by injecting fluid silicone rubber into a gap in the sealing cap 7 and solidifying it. Then, the sealing cap 7 idles around the retaining lock 6 and the locking nut 13 due to the sliding of the low friction elastic filler 14. Therefore, even when the sealing cap 7 is turned, the retaining lock 6 and the lock nut 13 do not rotate, and the lock nut 13 is not loosened.

In this embodiment, the sealing cap 7 is composed of an engaging body 15 provided with an engaging claw 10 and a cap body 16 on the rear side, and the engaging body 15 is connected to the cap body 16 by only connecting pins 17. Have been. Therefore, if the manufacturer adjusts the fuel limiting bolt 2 after shipping the engine, the entire circumference of the sealing cap 7 can be cut without cutting.
Only by cutting the connection pin 17, the engaging body 15 can be separated from the cap body 16 and the cap body 16 can be removed.

The peripheral wall of the engagement body 15 has an opening edge 4 at its front end.
A pin press-in hole 43 is drilled backward from 1 through
The opening peripheral wall 39 of the cap body 16 has an opening edge 44 thereon.
A pin press-in hole 45 is formed rearward. The connecting pin 17 is press-fitted into the pin press-fitting holes 43 and 45 from the front opening edge 41 of the engaging body 15 in series. The engaging body 15 and the cap main body 16 are respectively prevented from coming off by the connection pins 17 by press-fitting the connection pins 17 and are connected to each other. The connection by the connection pin 17 is performed at two places. At each connection point, a notch mark 47 is provided on the outer peripheral surface of the engagement body 15 toward the joint surface 46 between the connection body 15 and the cap body 16. Therefore, when the saw is pulled along the mark 47, the connecting pin 17 is reliably cut at the joint surface 46.

FIG. 3 is a view for explaining a modification of the sealing cap. In this modification, the engaging body 15 is connected to the cap body 16.
, And a part of the connection pin 17 is exposed from the gap 48 so that the position of the connection pin 17 can be clearly confirmed.

Although the contents of the embodiments of the present invention are as described above, the present invention is not limited to the above embodiments. For example, the above embodiment relates to a fuel limiting device for a diesel engine, but the present invention can also be used for a fuel limiting device for a spark ignition engine. That is, a fuel limiting bolt provided with a needle valve at its tip restricts fuel passing through the main jet of the air-fuel mixer, and fuel limiting bolts passing through the slow port and idle port of the air-fuel mixer. Applicable. Further, the present invention is also applicable to a high idle fuel limiting bolt having a high idle spring attached to a tip thereof, which limits fuel supply during idling.

[Brief description of the drawings]

FIG. 1 is a view for explaining a fuel limiting device for an engine according to an embodiment of the present invention. FIG. 1 (A) is a longitudinal side view, and FIG. 1 (B).
FIG. 3 is an exploded perspective view of a main part.

FIG. 2 is a longitudinal sectional side view of the vicinity of an injection pump case of an engine equipped with the fuel limiting device of FIG. 1;

FIG. 3 is a vertical sectional side view of a modified example of a sealing cap.

FIG. 4 is a vertical sectional side view of a fuel limiting device for an engine according to the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... bolt attachment part, 2 ... fuel limiting bolt, 3 ... bolt base end part, 4 ... tool engagement part, 5 ... bolt tip end part, 6 ... locking member, 7 ... sealing cap, 8 ... locking member Peripheral side,
10 engaging pawl, 11 front, 12 lock nut, 13
... Nuts for fixing locking members, 14. Elastic fillers, 15. Engaging bodies, 16... Cap body, 17.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F02D 1/00-1/18

Claims (3)

(57) [Claims] A fuel limiting bolt (2) is screwably mounted on a bolt mounting part (1) of an engine, and a tool engaging part (4) is attached to a bolt base end (3) of the fuel limiting bolt (2). And a bolt tip (5) of the fuel limiting bolt (2).
In the fuel limiting device for an engine configured to be able to limit the fuel in accordance with the forward and backward positions of the fuel limiting bolt, an annular retaining locking member (6) is attached to the bolt base end (3) of the fuel limiting bolt (2). The fuel retaining bolt (6) is fixed so as not to be movable in the axial direction of the fuel limiting bolt (2), and the bolt tip (5) side of the fuel limiting bolt (2) is located on the front side with the bolt base. With the end (3) side as the rear side, the locking body peripheral side surface (8) of the retaining locking body (6) is formed in a tapered shape expanding toward the front side, and the bolt base end (3) is formed. An inward engaging claw (10) is provided on a sealing cap (7) for sealing the tool engaging portion (4), and the sealing cap (7) is externally fitted to the retaining lock (6) from the rear side. By pushing in while making it, the peripheral surface of the locking body (8)
The engaging claw (10) is put on the upper part, and the retaining locking body (6)
And while at least one of the engaging claws (10) is elastically deformed, the engaging claws (10) are slid on the locking body peripheral side surface (8),
The engaging claw (10) passing over the peripheral side surface (8) of the locking body protrudes to the front side of the retaining locking body (6) upon restoration of the elastic deformation, and moves toward the rear side of the sealing cap (7). A fuel limiting device for an engine, characterized in that the disengagement is prevented by an engaging claw (10) engaging with the front surface (11) of the retaining lock (6). 2. The fuel limiting device for an engine according to claim 1, wherein a lock nut (12) is screwed to a fuel limiting bolt (2) at a front side of the retaining lock (6). In (12), the fuel limiting bolt (2) is fixed to the bolt mounting portion (1) in a state of preventing loosening, and
(6) Nut for fixing the locking body to the fuel limiting bolt (2) on the rear side
(13) is screwed on, and the locking force of the locking body fixing nut (13) is used to move the retaining lock (6) between the lock nut (12) and the locking body fixing nut (13). The gap in the sealing cap (7) is filled with a low-friction elastic filler (14) solidified by being injected into the gap in the sealing cap (7),
The sealing cap (7) idles around the retaining lock (6) and the lock nut (13) due to the sliding of the low friction elastic filler (14). And a fuel limiting device for an engine. 3. The fuel limiting device for an engine according to claim 1, wherein the sealing cap is provided.
Is constituted by an engaging body (15) provided with the engaging claw (10) and a cap body (16) on the rear side, and the engaging body (15) is connected to the cap body (16) only by the connecting pin (17). A fuel limiting device for an engine, comprising: