JPH0783141A - Sealing device for restriction bolt in engine - Google Patents

Abstract

PURPOSE:To prevent altering operation of various kinds of restriction bolt so as to simplify sealing operation. CONSTITUTION:A receiving stop part 6 is provided on one side of the restriction operating part 2 of a restriction bolt 1 and a protecting cap 7, and a locking part 8 having elastic restoring property is provided on the other side so as to switch an elastic deformated posture to its restored posture. Since when the restriction bolt 1 is covered with the protecting cap 7 the protecting cap 7 engages with the receiving stop part 6 of its counter part by elastic restoring force of the fitting part 8, the cap 7 can be fixed in one-touch so as to simplify sealing operation. And also it is possible to prevent certainly altering operation of the restriction bolt 1 after engine shipment by shielding action of the protecting cap 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel limiting bolt of a diesel engine, a high speed side or low speed side limiting bolt of an engine speed control lever, a limit adjusting bolt of a stop operating side receiving position of an engine stop lever, or a high idle spring. The present invention relates to a device for sealing various limit bolts such as the limit adjustment bolts, etc., which can surely seal the limit bolt and can simplify the sealing operation.

[0002]

BACKGROUND OF THE INVENTION For example, in a diesel engine, a fuel injection pump is normally fuel-limited to a predetermined maximum injection amount by a fuel limiting bolt. This maximum injection amount is not limited to the engine output but also NOx and particulates. It also affects the emission of air pollutants contained in the exhaust such as the rate. Therefore, if it is attempted to strictly meet the exhaust emission control requirements, it is necessary to make the fuel limiting bolt inoperable by the sealing means after the engine is shipped and adjust and hold it at an appropriate position.

[0003]

2. Description of the Related Art As a prior art 1 of a device for sealing a fuel limiting bolt, as shown in FIGS. 11 and 12, a fuel limiting bolt 1 is supported downward from an upper wall 13 of a pump chamber 12 of a diesel engine E. Second lever 15b
The pressing portion 3 of the fuel limiting bolt 1 is made to come into contact with the receiving portion 4 of the vehicle from above so that the maximum injection amount of the fuel injection pump 16 can be limited by the fuel limiting bolt 1. The lock nut 5 and the cap nut 51 are screw-fitted to the limited operation portion 2 near the side, and the protective cap 50 made of aluminum is fitted over these, and the intermediate portion 5 of the protective cap 50 is fitted.
There is a crimped version of 2.

Further, as the prior art 2, as shown in FIG. 13, the fuel limiting bolt 1 is constituted by a headed bolt, and a support bracket is provided on the upper wall 13 of the pump chamber 12 in the vicinity of the penetrating portion of the fuel limiting bolt 1. 53 is erected, and a wire 55 is connected across the through hole 53a formed in the bracket 53 and the through hole 54a formed in the head 54 of the limiting bolt 1, and both ends of the wire 55 are spotted with molten lead 56. There is a structure in which the fuel limiting bolt 1 can be sealed by pressing.

[0005]

2. Description of the Related Art 1 and 2 In the above-mentioned Prior Art 1, since the material of the protective cap 50 is soft aluminum, it is difficult to forcibly remove the protective cap 50 by using daily tools such as pliers. In addition, since the protective cap 50 is relatively easily deformable, it is easy to rotate the internal lock nut 5 and the like by operating the pinching operation from the outside of the protective cap 50. There is a risk of being manipulated.

Further, in the above-mentioned conventional technique 2, if the wire 55 is cut, the modification operation of the fuel limiting bolt 1 is further facilitated.

Therefore, the inventors of the present invention have conceived the following techniques 1 to 3 upon completion of the present invention for the purpose of solving the problems of the prior arts 1 and 2. As shown in FIG. 7, the above-mentioned idea technique 1 has a recessed embedded chamber 36 in the upper wall 13 of the pump chamber, a limiting operation portion 2 of the fuel limiting bolt 1 having a hexagonal hole, and a lock fitted to this. The nut 5 is retracted into the accommodating chamber 36, and the radial thin groove 39
The sealing lid 38 having the above is molded from a synthetic resin that is embrittled by heat curing, and the opening 37 of the housing chamber 36 is sealed by the sealing lid 38 so that the fuel restriction bolt 1 cannot be modified. Since the sealing lid 38 is fragile due to the heat during the painting of the engine, the fuel limiting bolt 1 can be easily readjusted by the manufacturer by breaking the sealing lid 38 along the thin groove 39.

The idea technique 2 is, as shown in FIG. 8, that a storage chamber 41 is formed in the pump chamber upper wall 13 through a cylindrical wall 40a or a recessed wall 40b, and the fuel limiting bolt 1 and the lock nut are provided in the storage chamber 41. 5 is evacuated and the accommodation chamber 41 is filled with a thermosetting resin to solidify the two, and the fuel limiting bolt 1
The modification operation of is surely prevented. Further, in the present idea technique 2, since the oil component which is about to leak from the pump chamber 12 can be blocked by the resin, the cap nut 51 and the like in the prior art technique 1 can be omitted. As shown in FIG. 8B, if the resin is scraped off by a releasing tool 44 such as a hole saw without a center drill, the fuel limiting bolt 1 can be readjusted.

Further, the idea technology 3 is an example in which the limiting bolt 1 is provided laterally on the basis of the idea technology 2 as shown in FIGS. 9 to 10. That is, the blocking wall 42 is provided around the lower half of the limiting operation portion 2 of the limiting bolt 1.
Is erected in a U shape, and a sealing lid 43 such as a rubber packing 43a (see FIG. 10A) or an adhesive sheet 43b (see FIG. 10B) is engaged with the blocking wall 42 to seal the blocking wall 42 and the sealing wall 43. As in the idea technique 2, a thermosetting resin is filled in the space surrounded by both the stoppers 43, and the limiting bolt 1 and the lock nut 5 are filled and solidified. Therefore, the present idea technique 3 has the same effect as the above idea technique 2.

[0010]

However, in the above idea technique 1, if the embrittlement of the sealing lid 38 is forcibly broken, there is a possibility that the limiting bolt 1 may be modified. In addition, in the idea techniques 2 and 3, it takes time for the resin to harden, and in particular, in the idea technique 3, the sealing lid 43 needs to be prepared, so that the sealing operation becomes complicated.
An object of the present invention is to reliably eliminate the modification operation of various limiting bolts and simplify the sealing operation.

[0011]

Means for achieving the above object will be described below with reference to FIGS. 1 to 6 showing an embodiment. That is, according to the present invention, the limiting bolt 1 is provided on the fixed portion 13 of the engine E, the limited portion 4 is configured to be adjustable by the pressing portion 3 of the limiting bolt 1, and the limiting operation portion 2 of the limiting bolt 1 is configured. And the protective cap 7 are provided with the receiving portion 6 on one side, and the elastically resting locking portion 8 is provided on the other side to elastically deform the posture P.
When the protective cap 7 is fitted on the limiting bolt 1, the locking portion 8 is in the elastically deformed posture P and continues to be released from the receiving portion 6, and the protective cap 7 is provided. When the bolt is completely fitted into the limiting bolt 1,
The locking portion 8 is in the restored posture Q and engages with the receiving portion 6, and the protective cap 7 is fixed to the fixing portion 13 via the limiting bolt 1 in a non-removable manner. It is a sealing device.

The limit bolt 1 is a fuel limit bolt, a high speed side or low speed side limit bolt of the speed control lever, a limit adjustment bolt for the stop operation side receiving position of the engine stop lever, or a high idle spring limit adjustment bolt. The restricted portion 4 is a predetermined portion such as a governor lever, a speed control lever, an engine stop lever, a high idle spring, or the like. The elastically deformable locking portion 8 is, for example, a retaining ring, a locking claw, or the like. The receiving portion 6 that engages with this means, for example, a receiving groove formed in the protective cap 7 or a screw groove of the limiting operation portion 2.

[0013]

When the protective cap 7 is fitted onto the limiting bolt 1, the locking portion 8 is in the elastically deformed posture P and continues to be released from the receiving portion 6 on the other side, so that the protective cap 7 is restricted by the limiting bolt 1. Smoothly fit into 1. Then, when the fitting operation of the protective cap 7 is completed, the locking portion 8 which is in the restoring posture Q due to the elastic restoring force engages with this receiving portion 6, and the protective cap 7 is fixed to the fixing portion 13 via the limiting bolt 1. Fixed irremovably. Therefore, due to the shielding action of the protective cap 7, the limiting bolt 1 cannot be rotated and removed.

[0014]

【The invention's effect】

(1) Since the limiting bolt is fixed by the shielding action of the protective cap so that the limiting bolt cannot be rotated and pulled out, it is possible to reliably prevent modification of the limiting bolt after the engine is shipped.

(2) Utilizing the elastic restoring force of the locking portion, the protective cap can be fixed irremovably with a single touch simply by fitting the protective cap toward the limiting operation portion of the limiting bolt, so that the sealing operation is extremely easy. Become.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged vertical sectional view of a main part of a device for sealing a fuel limiting bolt of a vertical diesel engine showing a first embodiment, FIG. 2 is a cross-sectional plan view of a protective cap, and FIG. 3 is an explanatory view showing a procedure for fitting a protective cap. FIG. 4 is a vertical cross-sectional view around the pump chamber of the diesel engine.

As shown in FIG. 4, a two-lever governor lever 15 is provided in the pump chamber 12 of the vertical diesel engine E.
Is supported around a fulcrum 15c, and the governor lever 15 is composed of a fork lever 15a and a second lever 15b. As shown in FIG. 3, the input part 17 of the fork lever 15a is interlocked with the governor weight 18 via the governor sleeve 19, and the output part 20 of the fork lever 15a is engaged with the metering rack pin 14 of the fuel injection pump 16. At the same time, attach the second lever 15b to the governor spring 2
1 to the governor lever 22 to connect the governor lever 1
5 is configured to be swingable by an unbalanced force between the governor force GF of the governor weight 18 and the spring force SF of the governor spring 21.

As shown in FIG. 4, the second lever 15b
The receiving part 4 is formed on the upper part of the
3, the fuel limiting bolt 1 is threadedly fitted through the lock nut 5 in a penetrating manner, and the pressing pin 3 at the lower end of the fuel limiting bolt 1 is brought into contact with the receiving portion 4 of the second lever 15b from above. The governor lever 1 swings toward the fuel increase side (the same direction as the above spring force SF).
5 is received by the fuel limiting bolt 1, and the maximum injection amount of the fuel injection pump 16 can be limited.

As shown in FIGS. 1 and 2, an engaging groove 23 is provided in the upper portion of the limiting operation portion 2 of the fuel limiting bolt 1, and the engaging groove 23 has an elastic restoring property and is partially formed. The notched C-shaped retaining ring 8 (see FIG. 2) is engaged in an elastically deformed posture P in which the diameter is reduced and in a restored posture Q in which the diameter is enlarged and reproduced so that the posture can be switched.

Further, the protective cap 7 is formed into a cylindrical shape with a bottom, and the bottom portion (that is, the upper portion in FIG. 1) is formed into a spherical shape so that the rotating tool cannot be engaged, and the fuel is provided in the center portion. An accommodation path 24 for the limiting operation portion 2 of the limiting bolt 1 and the lock nut 5
Is vertically recessed. The accommodating passage 24 is formed so as to be narrower toward the inner part 24a and wider toward the lower end opening 24b.
Further, the retaining ring 8 is fitted so as not to come off, and a downwardly widened inclined wall 25 for smoothly switching the posture of the retaining ring 8 is formed between the inner part 24a and the opening 24b.

Therefore, the sealing procedure of the sealing device of the first embodiment will be described. First, as shown in FIG. 3A, the protective cap 5
As the fuel limiting bolt 1 is fitted in the direction of the arrow R, the retaining ring 8 is pushed by the inclined wall 25 of the protective cap 7 and in the elastic deformation posture P in which the diameter is reduced in the direction of the arrow S. Change the posture. In this case, the retaining ring 8 has not yet reached the receiving groove 6 of the fuel limiting bolt 1, so that the engagement release state with respect to the receiving groove 6 continues.

Next, as shown in FIG. 3B, when the protective cap 7 is fitted on the fuel limiting bolt 1, the retaining ring 8 engages with the receiving groove 6 of the protective cap 7, and the restoring force in the direction of arrow T acts. Then, the elastically deformed posture P is switched to the restored posture Q in which the diameter is enlarged and reproduced.

As a result, the protective cap 7 is irremovably fixed to the upper wall 13 of the pump chamber via the fuel limiting bolt 1, and the protective cap 7 shields the fuel limiting bolt 1.
Since the rotation operation and the removal operation cannot be performed, it is possible to reliably prevent the modification operation of the fuel restriction bolt 1 after the engine is shipped. Further, since the elastic restoring force of the retaining ring 8 is used, the protective cap 5 can be fixed irremovably with one touch by simply fitting the protective cap 5 toward the limiting operation portion 2 of the fuel limiting bolt 1, so that the sealing operation is extremely easy. Become.

On the other hand, FIG. 5 shows a second embodiment of the present invention. Based on the bottomed cylindrical protective cap 7 of the first embodiment, a locking portion 8 is provided on the protective cap 7 side, and a fuel limiting bolt is provided. The receiving portion 6 is provided on the side of 1. That is,
A fixing ring 26 is provided in the middle of the accommodation path 24 of the protective cap 7.
As shown in FIG. 5B, the locking portion 8 is fixed through the annular member 28 made of synthetic resin (for example, polypropylene) having elastic restoring force in the radial direction. The locking claw portion 8a is integrally extended. Further, the receiving portion 6 is constituted by the thread groove of the limiting operation portion 2 of the fuel limiting bolt 1.

Therefore, when a copper packing 27 for sealing oil from the pump chamber 12 is placed on the upper surface of the lock nut 5 and the protective cap 7 is fitted toward the fuel limiting bolt 1, the copper cap 27 faces upward. The elastic force of the locking claw portion 8a inclined to
Since the locking claw portion 8a continues to be in the elastically deformed posture P, the fitting operation can be smoothly finished without being caught in the screw groove 6 of the bolt. On the other hand, when trying to remove the protective cap 7 that has already been fitted, the locking claw portion 8a switches to the restoring posture Q and engages with the thread groove 6, so that it becomes difficult to release the protective cap 7, The modification of the limiting bolt 1 can be reliably prevented.

As described above, the sealing device of the present invention is not limited to the fuel limiting bolt 1 and, for example, as shown in FIG. 6, the limiting bolt 1a and the limiting bolt 1a for controlling the high speed side H of the speed control lever 22. The present invention can also be applied to the limit bolt 1b for controlling the low speed side L and the limit adjustment bolt 1c for the stop operation side receiving position of the engine stop lever 35. In this case, the type of engine provided with the speed control lever 22 may be a diesel engine or a spark ignition engine.

[Brief description of drawings]

FIG. 1 is an enlarged vertical cross-sectional view of a main part of a fuel limiting bolt sealing device for a vertical diesel engine according to a first embodiment.

FIG. 2 is a cross-sectional plan view of a protective cap.

FIG. 3 is an explanatory view showing a procedure for fitting the protective cap, wherein FIG. 3A is a corresponding view during a fitting process, and FIG. 3B is a corresponding view at the end of fitting.

FIG. 4 is a vertical cross-sectional view around the pump chamber of the diesel engine.

FIG. 5A is a longitudinal sectional view of a main part of a fuel limiting bolt sealing device showing a second embodiment, and FIG. 5B is a plan view of a locking part.

FIG. 6 is an explanatory view showing an example in which the sealing device of the present invention is applied to a high speed side and a low speed side limit bolt of a speed control lever and an engine stop operation side receiving position limit adjustment bolt.

7A is a vertical cross-sectional view of a main part of a sealing device for a fuel limiting bolt showing idea technology 1, and FIG. 7B is a bottom view of a sealing lid.

FIG. 8 is a longitudinal cross-sectional view of a main part of a fuel limiting bolt sealing device showing idea technology 2; FIG. 8A is an equivalent view of a cylinder wall type, and FIG.
Is a corresponding figure of a concave wall type.

FIG. 9A is a vertical sectional side view of a main part of a fuel limiting bolt sealing device showing idea technology 3, and FIG. 9B is a schematic front view thereof.

FIG. 10 is a perspective view of a sealing lid showing the same idea generation technique 3;
FIG. A is a corresponding view of the rubber packing, and FIG. B is a corresponding view of the adhesive sheet.

FIG. 11 is a perspective view of a main part of the sealing device according to the related art 1.

FIG. 12 is a view equivalent to FIG. 4 showing the prior art 1.

FIG. 13 is a longitudinal sectional view of a main part of a sealing device according to a related art 2.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Limiting bolt, 2 ... Limiting bolt limiting operation part, 3 ... Limiting bolt pressing part, 4 ... Limiting part, 6 ... Receiving part, 7 ... Protective cap, 8 ... Locking part, P ... Locking part Elastic deformation posture, Q ... restoring posture of locking portion, 13 ... engine fixing portion, E ... engine.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasushi Matsuda 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Co., Ltd.

Claims (1)

[Claims] 1. A fixing bolt (1) is provided on a fixed portion (13) of an engine (E), and a restricted portion (4) can be limited and adjusted through a pressing portion (3) of the limiting bolt (1). The limit bolt (1) is provided with a receiving portion (6) on one of the limiting operation portion (2) and the protective cap (7), and an elastically restoring locking portion (8) is provided on the other end in an elastically deformed posture. (P) and the restoring posture (Q) are provided so that the posture can be switched, and while the protective cap (7) is being fitted on the limiting bolt (1), the locking portion (8) is in the elastic deformation posture (P). When the protective cap (7) has been fitted onto the limiting bolt (1) and the release continues from the receiving portion (6),
The locking portion (8) is in the restored posture (Q) and the receiving portion (6)
And a protective cap (7) fixed to the fixing portion (13) via the limiting bolt (1) in a non-detachable manner.