JPS6314031Y2 - - Google Patents

Description

[Detailed description of the invention] The purpose of the present invention is to easily and accurately fine-tune the fuel restriction amount with respect to a maximum fuel limiter for a fuel-injected engine, and to improve the setting accuracy of engine output. do.

Conventionally, the maximum fuel limiter is a pump chamber 31 in which a fuel injection pump 30 is attached, as shown in FIG.
A restricting bolt 35 is attached to one side wall 32, and the restriction bolt 35 is adjustable in the same direction Z as the swinging direction of the governor lever 34 that operates the control rack 33.
The tip end 35a of the limiting bolt 35 is brought into direct contact with the end face of the governor lever 34 to limit the swinging of the governor lever 34 toward the increase side, thereby setting the engine output.

However, in such a device, the adjustment dimension of the forward/backward movement of the limiting bolt directly becomes the movement limiting dimension of the governor lever, making it difficult to finely adjust the fuel injection amount with high precision.

The present invention was proposed in order to solve the above-mentioned drawbacks, and the fuel restrictor is inclined with respect to the contact surface of the fuel restrictor of the governor lever, thereby restricting the movement of the governor lever with respect to the forward/backward adjustment dimension of the fuel restrictor. By setting the dimensions to be small, the fuel restriction amount can be finely adjusted with high precision.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing the schematic structure of the engine, and this engine E includes a crankcase 1,
A cylinder block 2 is integrally formed above this,
A cylinder 4 in which a piston 3 is slidably housed is mounted on the cylinder block 2, and a cylinder head 5 and a head cover 6 are placed and fixed in this order above the cylinder block 2.

A fuel injection pump chamber 7 and a tappet chamber 8 are formed on the left and right sides of the cylinder block 2, respectively, and a fuel injection camshaft 9 is provided in the fuel injection pump chamber 7.
A valve drive camshaft 10 is rotatably supported in the tappet chamber 8, and a fuel cam gear 11 and a valve drive cam gear 12 are respectively fixed to the shaft ends of both camshafts 9 and 10, and a crank gear 13 2 It is decelerated and rotated.

When the fuel camshaft 9 rotates, the cam 16 pushes up the plunger 15 of the fuel injection pump 14, which is inserted into the fuel injection pump chamber 7 from above and is fixed, to inject fuel. The fuel injection amount is as shown in Figure 2.
The governor force F of the centrifugal governor 17 presses the control rack 21 of the fuel injection pump in the direction l toward the fuel reduction side, and the governor spring 19 is tensioned so that the rack 21 is pulled in the fuel increase direction r by the speed regulating lever 18. Governor lever 20 in balance with the tension of
The fuel injection pump 14 is metered by operating the control rack 21 of the fuel injection pump 14.
The governor lever 20 consists of a main governor lever 20a and a sub-governor lever 20b.
The tip of the main governor lever 20a is fitted into the control rack 21, and the tip of the main governor lever 20a is
A fuel limiter 22 is in contact with the fuel limiter 22 to limit the maximum amount of fuel to be injected.

This fuel restrictor 22 is fixed to the upper wall 7a of the pump chamber 7 so as to be adjustable in the direction Y perpendicular to the swinging direction of the governor lever 20, and the tip 22a of the fuel restrictor 22 comes into contact with it. Governor lever 2
The contact surface 23 of 0 is the forward/backward direction Y of the fuel restrictor 22
In contrast, as will be described later, a flat surface forming an angle θ smaller than 45° is formed on the top surface 20c of the tip end of the main governor lever 20a.

In this way, the fuel restrictor 22 is connected to the governor lever 2.
When the fuel restrictor 22 is screwed forward and advanced by the dimension (advance/retreat adjustment dimension) A, as shown in FIG. Since the amount of swinging (movement limit adjustment dimension) B is extremely small compared to the length from the contact point α to the swinging center o of the governor lever 20, if B moves linearly, then B=A・
It becomes tanθ. Therefore, if θ is greater than 0° and smaller than 45°, the movement limit adjustment dimension B of the governor lever 20 will be smaller than the advance/retreat adjustment dimension A of the fuel restrictor 22, allowing fine adjustment with high precision.

Further, in the above embodiment, the fuel restrictor 22 is provided so as to be adjusted forward and backward in the direction Y perpendicular to the swinging direction XX of the governor lever 20.
As shown in the figure, the fuel restrictor 22 is installed upright on the upper wall 7a of the pump chamber 7, and the abutting surface 23 is centered so that the fuel restricting device 22 and the abutting surface 23 in contact with it form an angle θ'. It may be formed on the governor lever 20a. In this case, the relationship between the advance/retreat adjustment dimension A of the fuel restrictor 22 and the movement restriction adjustment dimension B of the governor lever 20 is B=A・sinθ', so that the limiter 22
The range of angle θ' in which the governor lever 20 can be finely adjusted is 0°<θ'<90°.

Since the present invention is constructed and operates as described above, it has the following effects.

In other words, the contact surface that limits the amount of movement of the governor lever toward the increase side (which contacts the forward/backward adjustment direction of the limiter) that limits the amount of fuel injection is inclined, and the governor lever is lower than the forward/backward adjustment dimension of the fuel limiter. Since the movement limit dimension is set to be small, the fuel limit amount can be easily and precisely fine-tuned, and the setting accuracy of the engine output can be increased.

In addition, this structure can be easily implemented at low cost since it is only necessary to relatively change the forward/backward adjustment direction of the fuel restrictor and the orientation of the abutment surface.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the schematic structure of a vertical diesel engine, Fig. 2 is a sectional view taken along the line shown in Fig. 1,
Figure 3 is a schematic side view of the main parts to explain the action, Figure 4
The figure is a view corresponding to FIG. 2 showing another embodiment, and FIG. 5 is a side view of main parts showing a conventional example. 14... Fuel injection pump, 19... Governor spring, 20... Governor lever, 21... Rack of 14, 22... Fuel restrictor, 23... Contact surface,
A...Advance/retreat adjustment dimension, B...Movement limit adjustment dimension,
F...Governor flow, l...Fuel reduction side, r...
Fuel increase side.

Claims (1)

[Scope of utility model registration request] Connect the rack 21 of the fuel injection pump 14 of the engine to the governor spring 1 through the governor lever 20.
9 operates to the fuel increasing side r, and the governor force F operates to the fuel decreasing side l, and the abutting surface 23 formed on the governor lever 20 is received by the fuel restrictor 22. The fuel limiter 22 is configured to limit the movement of the governor lever 20 toward the fuel increase side r by receiving the fuel limiter 22, and the fuel limiter 22 is configured to be adjustable forwards and backwards in a direction inclined with respect to the contact surface 23. A maximum fuel limiting device for a fuel injection type engine, characterized in that a movement limiting dimension B of a governor lever 20 is set smaller than a forward/backward adjusting dimension A of a fuel restricting device 22.