JPH0783142A - Sealing device for restriction bolt in engine - Google Patents

Abstract

PURPOSE:To eliminate certainly altering operation of various kinds of restriction bolts so as to simplify sealing structure and operation. CONSTITUTION:A restriction bolt 1 is screwing fit in a bolt fitting hole 6, and a striking part 7 is provided on the circumferential wall of the restriction bolt 1 or the bolt fitting hole 6. A deformation tool 8 so formed as to be capable of being struck in the striking part 7. Since the restriction bolt 1 is fixed non- rotatably by deformation of the restriction bolt 1 and the like when the deformation tool 8 is struck in the striking part 7, altering operation of the restriction bolt 1 after engine shipment can be prevented certainly. And also it is possible to simplify sealing operation and structure by only striking the deformation tool 8 in the striking part 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. A sealing device for various limiting bolts such as a limiting adjustment bolt, which can securely seal the limiting bolt and simplify the sealing structure and 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 for a device for sealing a fuel limiting bolt, as shown in FIGS. 8 and 9, a fuel limiting bolt 1 is supported downwardly from an upper wall 13 of a pump chamber 12 of a diesel engine E. Then, the pressing portion 3 of the fuel limiting bolt 1 is brought into contact with the receiving portion 4 of the second lever 15b from above so that the maximum injection amount of the fuel injection pump 16 can be limited by the fuel limiting bolt 1. A lock nut 5 and a cap nut 51 are screw-fitted to the upper limit operation portion 2 of the limit bolt 1, an aluminum protective cap 50 is fitted over these, and an intermediate portion 52 of the protective cap 50 is caulked. There is.

Further, as the prior art 2, as shown in FIG. 10, 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 penetration 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]

In the above-mentioned prior art 1,
Since the material of the protective cap 50 is soft aluminum, it is not difficult to forcibly remove the protective cap 50 by using daily tools such as pliers, and the protective cap 50 is relatively easily deformable. By pinching from the outside of the protective cap 50,
Since it is easy to rotate the internal lock nut 5 and the like, there is a risk that the fuel limiting bolt 1 may be manipulated. Moreover, since the protective cap 50 and the cap nut 51 are required, the sealing structure becomes complicated.

On the other hand, in the above-mentioned prior art 2, if the wire 55 is cut, the modification operation of the fuel limiting bolt 1 is easier. Further, since the operation of connecting the wire 55 and pressing the sealing lead 56 in a spot shape is required, the sealing work is complicated. An object of the present invention is to reliably eliminate the modification operation of various limiting bolts and to simplify the sealing structure and work.

[0007]

Means for achieving the above object will be described below with reference to FIGS. 1 to 7 showing an embodiment. That is, the present invention 1 is configured such that the limiting bolt 1 is screw-fitted into the bolt fitting hole 6 of the engine E, and the limited portion 4 can be limited and adjusted via the pressing portion 3 of the limiting bolt 1. 1 and the peripheral wall 11 of the bolt fitting hole 6 are provided with a driving part 7 and the deforming tool 8 is attached to the driving part 7.
When the deforming tool 8 is driven into the driving portion 7, the limiting bolt 1 and the peripheral wall 1 of the bolt fitting hole 6 are configured.
1 is deformed so that the limiting bolt 1 is non-rotatably fixed to the bolt fitting hole 6 in the engine. A second aspect of the present invention is the same as the first aspect, wherein the limiting bolt 1 is provided with a breakage portion 10.
When the torque applied to the limiting bolt 1 exceeds the fastening torque, the breaking portion 10 can be broken.

The limiting bolt 1 is a fuel limiting bolt, a high speed side or low speed side limiting bolt of the speed control lever, a limit adjusting bolt of a stop operation side receiving position of the engine stop lever, or a high idle spring limit adjusting bolt. ,
The restricted portion 4 refers to a predetermined portion such as a governor lever, a speed control lever, an engine stop lever, a high idle spring, or the like. The deforming tool 8 refers to a steel ball, a wedge, or the like. The driving part 7 is a driving hole or a slit.
The breakage portion 10 refers to, for example, a cut groove provided around or engraved on the side wall of the limiting bolt 1 or an engaging groove for a rotating tool such as a driver provided on the head of the limiting bolt 1.
The breakage of the breaking portion 10 means twisting, crushing, breaking, and the like.

[0009]

In the present invention 1, when the deforming tool 8 is driven into the driving portion 7, the limiting bolt 1 and the peripheral wall 11 of the bolt fitting hole 6 are driven.
One of the two deforms, the limiting bolt 1 and the bolt fitting hole 6 are forcibly brought into close contact with each other, and the limiting bolt 1 is non-rotatably fixed to the bolt fitting hole 6. Therefore, the limiting bolt 1 cannot be rotated by a daily tool. Further, when the limiting bolt 1 is provided with the breaking portion 10 as in the second aspect of the present invention, when the lock nut 5 is loaded with a torque equal to or higher than the fastening torque, the breaking portion 10 is broken and the rotation tool is not engaged. It will be difficult.

[0010]

【The invention's effect】

(1) The present invention 1 has the following effects. When the deforming tool is driven, either the limit bolt or the peripheral wall of the bolt fitting hole is deformed, and the limit bolt is fixed so that it cannot rotate with daily tools. Operation can be reliably prevented. Since the deforming tool is simply driven into the driving section, the sealing operation is simplified. Since only the driving part and the deformable tool that can be driven into the driving part are manufactured, the lock nut and the protective cap shown in the above-mentioned prior art are not required, and the sealing structure is simple and can be implemented at low cost.

(2) In the second aspect of the present invention, when a force exceeding the fastening torque is applied to the limit bolt, the breaking portion is damaged and the limit bolt cannot be operated. Therefore, the effect of preventing modification of the limit bolt can be further enhanced.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged vertical cross-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 schematic plan view of the fuel limiting bolt, and FIG. 3 is a vertical cross section around a pump chamber of the diesel engine. It is a side view.

As shown in FIG. 3, 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. 3, the second lever 15b.
A receiving portion 4 is formed on an upper portion of the engine, and a bolt fitting hole 6 is formed in an upper wall 13 of a pump chamber 12 which is a fixed portion of the engine
The fuel limiting bolt 1 is screwed downward into the bolt fitting hole 6 in a penetrating manner, and the pressing pin 3 at the lower end of the fuel limiting bolt 1 is attached.
To the receiving portion 4 of the second lever 15b so that the second lever 15b can come into contact with the receiving portion 4 from above.
The governor lever 15 swinging in the same direction as F is received by the fuel limiting bolt 1 so that the maximum injection amount of the fuel injection pump 16 can be limited.

As shown in FIG. 1, a driving hole 7 is formed downward from the head portion 23 along the axis of the rod-shaped fuel limiting bolt 1, and a steel ball 8 can be driven into the driving hole 7. That is, as shown in FIG. 1A, the inner diameter of the inlet portion 7a of the driving hole 7 is set to be slightly larger than the diameter of the steel ball 8 and the inner diameter of the inner portion 7b thereof is set to be slightly smaller than the steel ball 8.
The driving hole 7 is deeply machined so that it reaches at least the inside of the meat wall of the pump chamber upper wall 13. Further, as shown in FIG. 1, when a cut-out fracture groove 10 is provided around the lower limit operation portion 2 of the fuel limiting bolt 1 and the torque applied to the fuel limiting bolt 1 exceeds the fastening torque, Fracture groove 10
Is configured so that it can be twisted.

Therefore, the sealing procedure of the first embodiment will be described. As shown in FIG. 1A, after the fuel limiting bolt 1 is adjusted to an appropriate fuel increasing position, the steel ball 8 is inserted into the driving hole 7 of the bolt 1. Type in. In this case, fuel limit bolt 1
When a force exceeding the fastening torque is applied to the fuel cell, the upper limit operation portion 2 of the fuel limit bolt 1 is twisted at the break groove 10 as a boundary, as shown by the phantom line in FIG. 1B.

When the steel ball 8 is driven, the hole 7 into which the fuel limiting bolt 1 is driven is expanded and deformed, and the expanding force indicated by the arrow P acts so that the fuel limiting bolt 1 is closely fixed to the bolt fitting hole 6. The fuel limiting bolt 1 is non-rotatably fixed in the bolt fitting hole 6. Therefore, the limiting bolt 1 cannot be rotated by a daily tool, and the modification operation of the fuel limiting bolt 1 after the engine is shipped can be reliably prevented. Further, the breaking groove 10 of the fuel limiting bolt 1 is twisted to make it difficult to engage the turning tool, and the fuel limiting bolt 1 cannot be operated. Therefore, the effect of preventing alteration of the limiting bolt 1 can be further enhanced.

The head 23 of the fuel restriction bolt 1 is provided with an engaging groove 24 for a rotary tool such as a driver. The engaging groove 24 is crushed by the action of a force exceeding the fastening torque. It may be configured as follows.

That is, as shown in FIG. 1, instead of providing a break groove around the side wall of the bolt, this breakable engaging groove 24 may also serve as the break portion 10. In this case, in the present fuel limiting bolt 1, since the head portion 23 is formed into a cylindrical shape by forming the driving hole 7, the engaging groove 24 is easily crushed due to the structure of the bolt itself, and the work of breakage can be performed more easily. . Further, the damage treatment of the fuel limiting bolt 1 may be performed immediately after the limitation adjustment of the bolt 1 but may be performed before or after the engine is shipped.

On the other hand, FIG. 4 shows a second embodiment of the present invention. Instead of providing the driving hole 7 in the fuel limiting bolt 1, the peripheral wall 11 of the bolt fitting hole 6 (that is, the pump chamber upper wall 13) is shown. It was formed.

That is, as shown in FIG. 4, the peripheral wall 11 is formed.
Of these, a driving hole 7 is drilled on one side of the fuel limiting bolt 1 by drilling, a steel ball 8 is driven into the driving hole 7, and the bolt fitting hole 6 is distorted by the diameter expansion of the driving hole 7. (See arrow Q), the fuel limiting bolt 1 is non-rotatably fixed to the bolt fitting hole 6. As shown by the phantom line in FIG. 4B, the number of the driving holes 7 is not limited to one, and two or more holes may be provided on both sides of the fuel restriction bolt 1.

5 and 6 show a third embodiment of the present invention, in which the present invention is applied to the limiting bolts 1a.
1b and the limit adjustment bolt 1c for the stop operation side receiving position of the engine stop lever 35. That is, the support bracket 13 is erected as a fixed part of the engine on the base 25 on which the speed control lever 22 and the stop lever 35 are pivotally supported, and the limiting bolt 1 is laterally mounted in the bolt fitting hole 6 of the support bracket 13. Screw in the direction. Further, the support bracket 13 is formed in a split structure in which a slit 26 is inserted downward from the center portion, and a driving hole 7 is formed in the peripheral wall 11 on the inlet side of the slit 26.
The steel ball 8 is driven into the. As shown in FIG. 6A, a round hole 27 is formed at the rear end of the slit 26 to prevent stress concentration.

In the third embodiment, when the steel ball 8 is driven into the driving hole 7 after the limiting bolt 1 is adjusted, the upper portion of the slit 26 widens and the supporting bracket 13 having the split structure is distorted (see arrow R). The fuel restriction bolt 1 can be fixed to the bolt fitting hole 6 so as not to rotate. In addition, the head 2 of the limiting bolt 1
The engaging groove 24 of No. 3 is formed shallow, and when a force exceeding the fastening torque is applied to the limiting bolt 1, the engaging groove 24 is crushed and it is difficult to modify the limiting bolt 1.

On the other hand, FIG. 7 shows a modified example of the device for sealing the limiting bolt 1 of the speed control lever 22, which is based on the above-mentioned Embodiment 3 and has a wedge 26 driven into the driving hole 7 to form a slit 26.
Is configured so that it can be expanded, and the limiting operation portion 2 of the limiting bolt 1 is set to retract into the bolt fitting hole 6 so as not to be exposed to the outside, so that the effect of preventing alteration of the limiting bolt 1 is further enhanced. It was done.

[Brief description of drawings]

FIG. 1 is an enlarged vertical cross-sectional view of a main part of a device for sealing a fuel limiting bolt of a vertical diesel engine showing a first embodiment, where FIG. 1A is an equivalent view before driving a steel ball, and FIG. FIG.

FIG. 2 is a schematic plan view of a fuel limiting bolt.

FIG. 3 is a vertical cross-sectional view around the pump chamber of the diesel engine.

4 shows a second embodiment, FIG. 4A is a longitudinal sectional view of a main portion of a fuel limiting bolt sealing device, and FIG. 4B is a plan view thereof.

FIG. 5 is an explanatory diagram showing a third embodiment in which the present invention is applied to the high speed side and low speed side limit bolts of the speed control lever and the limit adjustment bolts for the stop operation side receiving position of the engine stop lever.

FIG. 6A is a longitudinal sectional view of an essential part of a device for sealing a limiting bolt showing the third embodiment, and FIG. 6B is a partially cutaway plan view thereof.

FIG. 7 is a view equivalent to FIG. 6A showing a modified example of the speed control lever limiting bolt sealing device.

FIG. 8 is a perspective view of a main part of the sealing device according to the related art 1.

FIG. 9 is a view corresponding to FIG. 3 showing the prior art 1;

FIG. 10 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, 3 ... Limiting bolt pressing part, 4 ... Restricted part, 6 ... Bolt fitting hole, 7 ... Driving part, 8 ... Deformation tool, 10 ... Limiting bolt breaking part, 11 ... Bolt fitting Peripheral wall of the hole, E ... engine.

Claims (2)

[Claims] 1. A limiting bolt (1) is screwed into a bolt fitting hole (6) of an engine (E), and a pressing portion of the limiting bolt (1) is pressed.
The restricted portion (4) is configured so that it can be restricted and adjusted via (3), and the driven portion (1) is inserted into either the limiting bolt (1) or the peripheral wall (11) of the bolt fitting hole (6). 7) is provided so that the deforming tool (8) can be driven into the driving part (7), and when the deforming tool (8) is driven into the driving part (7), the limiting bolt
Either one of (1) and the peripheral wall (11) of the bolt fitting hole (6) is deformed, and the limiting bolt (1) is fixed to the bolt fitting hole (6) in a non-rotatable manner. An engine limit bolt sealing device characterized by the above. 2. A breaking portion (10) is provided on the limiting bolt (1),
The device for sealing a limiting bolt of an engine according to claim 1, wherein the breaking portion (10) is configured to be breakable when the torque applied to the limiting bolt (1) exceeds the fastening torque. .