JP2592167Y2 - Governor mechanism of internal combustion engine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention provides a structure in which a governor lever can be rotated around a governor shaft within a predetermined rotation range in order to increase a fuel injection amount at the start of a diesel engine.

[0002]

2. Description of the Related Art A governor mechanism of a conventional internal combustion engine has been configured as shown in FIGS. FIG. 5 is a front view showing the configuration of a governor mechanism of a conventional internal combustion engine, FIG. 6 is a side view showing the same conventional configuration, and FIG. 7 is a front sectional view showing a conventional bearing support structure of the governor shaft 21.

[0003]

[Problems to be solved by the invention] As shown in the above figures,
Conventionally, a two-lever governor having a governor lever 18 for operating a metering member of the fuel injection pump P and a starting lever 19 fixed to the governor shaft 21 is separately provided. An urging spring 20 was interposed between the lever 19 and the lever 19. In the conventional configuration, the number of parts is increased by the governor lever 18 and the starting lever 19, and it takes time to assemble the governor lever 18, the starting lever 19, and the biasing spring 20.
There was a problem that skill was required. In the method of supporting the governor shaft 21, the movement of the shaft in and out is restricted by sandwiching both ends of the cylinder block wall 11. However, since the inner end surface of the cylinder block wall 11 is formed by the casting surface of the die cast casting, the number of the shims S is changed to change the boss length. Therefore,
The complicated assembly work of adjusting the boss length by the shim S was required. The present invention has improved such disadvantages.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. In claim 1, the fuel injection pump
Governor operating the P metering control lever 15
Rotate bar 2 around governor axis 1 by the specified rotation range
In the movable configuration, the governor lever 2 is folded at both ends.
The bearing holes 2a are provided in the bent portions 2a and 2b and the bent portions 2a and 2b at both ends.
d and 2e, and the bearing holes 2d and 2e are
Governor and bearing support through the re Sunda block wall 11
The inner end of the shaft 1 is fitted into the shaft 1 and approximately at the center of the bent portions 2a and 2b.
Fixed to the governor shaft 1 in the long hole 2c drilled at the center position
The locking pin 5 is fitted to generate the turning power of the governor lever 2
Between the bent portions 2a and 2b.
The torsion spring 3 is arranged, and one end of the torsion spring 3 is provided.
Is locked by a locking pin 5 fixed to the governor shaft 1 .

[0005] In claim 2, the fuel injection pump P
Governor lever that operates the metering control lever 15
2 can rotate around the governor shaft 1 within the specified rotation range
The governor lever 2 is mounted on a cylinder
Bearing supported by governor shaft 1 penetrating block wall 11
And the cylinder block wall 1 of the governor shaft 1
1 is pressed against the cylinder block wall 11.
And protruded into the cylinder block wall 11,
It is constituted by the end of the bearing 12 of the governor shaft 1 .

[0006]

Next, the operation will be described. That is, unlike the related art, it is not necessary to use two levers such as the governor lever 18 and the starting lever 19, so that it is possible to minimize the play due to the stacking of parts, and to ensure the fuel injection pump P Injection amount control can be performed.
Further, since it can be constituted by the minimum parts, the cost of the governor mechanism of the internal combustion engine can be reduced and the assemblability can be improved.
In addition, the governor shaft 1 and the governor lever 2 are the minimum required parts, and the torsion spring 3 can be arranged in a narrow space between the governor shaft 1 and the governor lever 2, thereby reducing the size of the governor mechanism of the internal combustion engine. Simplification can be achieved and assembly can be facilitated. Further, the locking pin 5 can serve the three functions of the function of preventing the governor lever 2 from coming off, the function of regulating the amount of automatic control rotation of the governor lever 2, and the function of the locking body of the torsion spring 3. With the above components and space, a plurality of functions can be configured with a simple structure. Further, since the bearing 12 is protruded into the cylinder block wall 11 and the projection distance T can be precisely controlled by a press-fitting jig, there is no variation, and the roughness of the bearing end surface is small. Since the adjustment is not required and the sliding resistance of the governor lever 2 is reduced, an accurate injection amount can be obtained.

Next, an embodiment will be described. 1 is a front sectional view of the governor mechanism of the internal combustion engine of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a front sectional view showing a bearing support structure of the governor shaft 1 of the present invention, and FIG. 4 is a governor lever of the present invention. FIG. 2 is a perspective view of FIG. This will be described with reference to FIGS. 1, 2 and 4. The governor lever 2, the governor device G, and the metering control lever 15 of the fuel injection pump P are disposed inside the cylinder block wall 11 with the cylinder block wall 11 interposed therebetween. The governor shaft 1 is disposed so as to pass through the inside and outside of the cylinder block wall 11, and an external lever 17 is disposed at a portion where the governor shaft 1 protrudes to the outside. Since the governor G is stopped when the diesel engine is started, the governor force PF is zero, and the governor lever 2 is rotated by the torsion spring 3 toward the injection pump increasing side.

After the start of the diesel engine, it is necessary to return the governor lever 2 to the set position by overcoming the force of the torsion spring 3 by the governor force PF due to the rotation of the governor device G. For this purpose, a long hole 2 c is opened in the governor lever 2, and the upper and lower ends in the rotation direction of the long hole 2 c serve as rotation stoppers of the governor lever 2. When the lower end of the governor lever 2 is pressed by the slide shaft 9 of the governor device G, the both ends bent portions 2a and 2
The upper end of the governor lever 2 pivotally supported by the part b rotates in the opposite direction, and the lever pin 16 of the control lever 15 disposed between the tip of the governor lever 2 and the holding elastic piece 6 is increased. It is operated on the weight reduction side.

In the above-described overall configuration, the present invention is based on the prior art. As shown in FIGS. 5 and 6, the two levers of the governor lever 18 and the starting lever 19 are provided inside the governor shaft 21. The point of locking at the end is improved, and the governor lever 2 and the locking pin 5 are configured to perform the same function. Further, the governor lever 2 is not made of a castable component as in the prior art, but is formed by pressing a steel plate.

That is, as shown in FIG.
Has a holding elastic piece 6 integrated at the upper portion to constitute a holding portion of the lever pin 16, and a pivotal support portion with the governor shaft 1 has both end bent portions 2 a and 2 b at inner and outer positions. Bearing holes 2d and 2e are opened in the bent portions 2a and 2b at both ends,
The governor shaft 1 is fitted. When the governor shaft 1 is fitted in the bearing holes 2d and 2e, a locking pin 5 is disposed as a retaining pin which is configured to prevent the governor lever 2 from falling out of the governor shaft 1. The locking pin 5 is press-fitted or screwed into the governor shaft 1 and is integrally fixed. The locking pin 5 is fitted in a longitudinally long hole 2c formed at a position between the bent portions 2a and 2b at both ends of the governor lever 2.

The length of the long hole 2c is slightly larger than the diameter of the locking pin 5 in the short diameter direction, and the governor lever 2 is configured not to move in and out. However, slot 2
“c” has a long diameter in the vertical direction, and the governor lever 2 can freely rotate by this margin. It is possible to increase the amount at the time of start-up at a portion where the locking pin 5 and the long hole 2c have a margin. The locking pin 5 fixed to the governor shaft 1 also functions as a locking device for the torsion spring 3 for pushing back the governor lever 2 when the engine stops. That is, the torsion spring 3 is configured as a helical torsion spring fitted around the governor shaft 1, and has one end portion as the governor lever 2.
Is in contact with the surface opposite to the slide shaft 9, but the other end is locked by the locking pin 5.

Next, the positioning configuration of the governor shaft 1 will be described. Conventionally, as shown in FIG. 7, the regulation of the position of the governor shaft 1 inside and outside is performed using the thickness t of the inside and outside ends of the cylinder block wall 11. But,
Since the inner surface of the cylinder block wall 11 uses the surface of the casting surface of the die-cast casting as it is, the thickness t is not constant. With respect to the thickness t of the cylinder block wall 11 in this irregular state, the external lever 17 and the governor lever 18 are attached to the inner and outer ends of the governor shaft 21 by the locking pins 30.
When the thickness t is small, the governor shaft 21 moves inward and outward, and the displacement causes a variation in the operation amount of the metering control lever 15.
This hindered accurate rotation speed control. In order to avoid this, the position of the governor shaft 21 was regulated accurately by interposing the shim S and adjusting the number and thickness of the shim S. It was increasing.

In the present invention, in order to solve this problem, the bearing metal 12 press-fit into the cylinder block wall 11 from the inside is made to protrude inside the cylinder block wall 11, and the outer surface of the cylinder block wall 11 is machined. The distance T from the end face is configured to be managed during the press-fitting assembly. Therefore, the distance T is always constant. Even when the external lever 17 and the governor lever 2 are locked at the inner and outer ends of the governor shaft 1 by the locking pins 30 and 31, the distance T is slightly different from the distance T. The assembly accuracy can be easily controlled at a distance having the above gap. Therefore,
There is no need to interpose a shim S as in the prior art.

[0014]

[Effects of the Invention] The present invention is constructed as described above, and has the following effects. Structured as in claim 1
Therefore, unlike the related art, there is no need to use two levers such as the governor lever 18 and the starting lever 19, so that it is possible to minimize the play due to the stacking of parts, and to ensure the fuel injection pump P Injection amount control can be performed. In addition, since it can be configured with the minimum parts, the cost of the governor mechanism of the internal combustion engine can be reduced and the assemblability can be improved. Further, the governor shaft 1 and the governor lever 2 are the minimum necessary parts, and the torsion spring 3 constituting the biasing spring is also the governor shaft 1 and the governor lever 2.
Thus, the governor mechanism of the internal combustion engine can be made compact and simple, and assembly can be facilitated. Also,
The locking pin 5 can serve the three functions of preventing the governor lever 2 from slipping off, regulating the amount of automatic control rotation of the governor lever 2, and locking the torsion spring 3. With a space, multiple functions could be configured with a simple structure.

Since the bearing 12 is protruded into the cylinder block wall 11 and the projection distance T can be precisely controlled by a press-fitting jig, there is no variation, and the bearing end face can be prevented. Is small, the adjustment by the shim S is not required , and the sliding resistance of the governor lever 2 is small, so that an accurate injection amount can be obtained.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a governor mechanism of an internal combustion engine of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a front sectional view showing the bearing support structure of the governor shaft 1 of the present invention.

FIG. 4 is a perspective view of the governor lever 2 of the present invention.

FIG. 5 is a front view showing a configuration of a governor mechanism of a conventional internal combustion engine.

FIG. 6 is a side view showing a conventional configuration.

FIG. 7 is a front sectional view showing a conventional bearing support structure for the governor shaft 21.

[Explanation of symbols]

 P Fuel injection pump 1 Governor shaft 2 Governor lever 2a, 2b Both ends bent portion 2c Long hole 2d, 2e Bearing hole 3 Torsion spring 5 Locking pin 6 Nipping elastic piece 9 Slide shaft 11 Cylinder block wall 12 Bearing 17 External lever

Claims (2)

(57) [Scope of request for utility model registration] 1. A metering control system for a fuel injection pump P.
Move the governor lever 2 that operates the bar 15 to the governor shaft 1
In a configuration that allows rotation within a specified rotation range around the
The governor lever 2 has bent portions 2a and 2b at both ends.
A configuration in which bearing holes 2d and 2e are provided in the end bent portions 2a and 2b;
Then, the cylinder block wall 11 is inserted into the bearing holes 2d and 2e.
The inner end of the governor shaft 1 that penetrates and supports the bearing is fitted,
A long hole 2 formed substantially at the center of the bent portions 2a and 2b at both ends.
c, the locking pin 5 fixed to the governor shaft 1 is fitted,
The urging spring for generating the rotating power of the banner lever 2
The torsion spring 3 is disposed between the bent portions 2a and 2b at both ends.
And one end of the torsion spring 3 is fixed to the governor shaft 1.
A governor mechanism for an internal combustion engine, wherein the governor mechanism is locked to a locking pin 5 . 2. A control system for controlling a fuel injection pump P.
Move the governor lever 2 that operates the bar 15 to the governor shaft 1
In a configuration that allows rotation within a specified rotation range around the
Then, the governor lever 2 penetrates through the cylinder block wall 11.
The governor shaft 1 through which the bearing is supported.
Rules for moving banner shaft 1 in and out of cylinder block wall 11
The cylinder is pressed into the cylinder block wall 11
Governor shaft 1 bearing protruding into lock wall 11
12. A governor mechanism for an internal combustion engine, comprising: twelve ends .