JPS5913312Y2 - Governor for internal combustion engines - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a governor used to control a fuel injection pump, and in particular improves the relationship between the operating angle of the adjusting lever and the injection amount characteristics.

In conventional all-speed governors, the operating angle of the adjusting lever and the tension of the two main springs are almost directly proportional, so as shown in Figure 1, the number of revolutions when the adjusting lever is moved by a constant angle is -The injection quantity characteristics are also approximately equally spaced, and the relationship between the adjusting lever operating angle and the engine speed is a linear relationship as shown by the broken line in FIG.

Furthermore, in the case of the highest and lowest speed governor, the relationship is as shown by the broken line in FIG.

Therefore, when a conventional governor is installed in a vehicle, when you step on the accelerator, which is connected to the adjusting lever via a cable, the engine does not rev up in the low rotation range, making it difficult to get a good driving feeling. This results in the following drawback.

Therefore, an object of the present invention is to provide a speed governor that improves engine speed characteristics in a low rotation range.

The present invention will be described below with reference to embodiments shown in the drawings.

In FIGS. 3 to 5 showing the first embodiment, the plunger 1 is slidable in the axial direction with respect to the drive shaft 2 and rotatable together with the drive shaft 2 rotating in synchronization with the engine. It is coupled and slidably inserted into the cylinder 3 and control sleeve 4 in an oil-tight manner.

The flyweight 5 is installed in a holder 7 that is driven by the drive shaft 2 via a gear 6, and generates centrifugal force according to the rotational speed to apply thrust to the governor sleeve 8.

Start lever 9 and tension lever 10 have pin 11
It is rotatably supported by the start lever 9.
A joint 12 provided at one end of the control sleeve 4 is slidably fitted into a hole in the control sleeve 4.

One end of the start spring 13 is fixed to the start lever 9, and the other end contacts the tension lever 10.

The seat 14 is slidable relative to the tension lever 10 and is engaged with a main spring 15, and a damper spring 16 is installed between the seat 14 and the tension lever 10.

The idle spring 17 is installed between the start lever 9 and the tension lever 10.

An adjusting lever 19 connected to the accelerator of the vehicle is connected to one end of the shaft 18, and a throttle lever 20 having an elongated hole 20a is connected to the other end.

The pin 21 is slidably inserted into the elongated hole 20a of the throttle lever 20, inserted into the connecting plate 22 to which the main spring 15 is locked, and further slidably inserted into the groove 23a of the plate 23. has been done.

Next, the operation will be explained.

As is well known, the plunger 1 is driven by a drive shaft 2 through a coupling, a face cam, and a roller ring to perform rotational and reciprocating motion, and pressure-feeds and distributes fuel into the combustion chamber of a multi-cylinder engine (not shown).

The fuel injection amount is adjusted by changing the pressure stroke by moving the control sleeve 4, and the position of the control sleeve 4 is determined by the thrust of the governor sleeve 8 and each spring 13, 15, 16, 17 of the governor. Determined by balance.

The throttle lever 20, which rotates the adjuster lever 19 about the shaft 18 in the direction of arrow A in FIG. 5, also rotates.

At this time, the pin 21 moves to the left in FIG. 5 along both the elongated hole 20a and the groove 23a, applying tension to the main spring 15 via the connecting plate 22.

The operation at this time will be explained in detail with reference to FIG.

In the modular diagram of FIG. 6, point P1. P2... indicates the position of the pin 21, line 1 indicates the groove 23a, point O indicates the center point of the shaft 18, line r1. r2... indicates the position of the elongated hole 20a, respectively.

When the throttle lever 20 is moved by the same angle θ in the direction of increasing the tension of the main spring 15, the pin 21
The positions of Pl, P2. P3. P4. P5, and its displacement positions are Ll, L2. L3. It gradually becomes smaller like L4.

In this way, by changing the amount of displacement of the pin 21, that is, the amount of change in the tension of the main spring 15, depending on the angle of the adjuster stylus lever 19 and, in turn, the throttle lever 20, when the adjuster stylus dapper 19 is moved by a constant angle, The characteristics shown in FIG. 7 are obtained, and therefore the characteristics shown by the solid line in FIG. 2 are obtained, and the engine speed characteristics in the low rotation range are improved.

Although the above embodiment describes a distribution type fuel injection pump with a built-in governor, the present invention is also applicable to a type in which a governor is installed next to the injection pump and the position of the control rack of the injection pump is controlled by the governor. can.

Next, a second embodiment shown in FIG. 8 will be described.

In place of the plate 23 in the previous embodiment, this embodiment includes a support lever 2 that rotates about a shaft 24.
5 is provided, and a pin 21 is also inserted into this support lever 25.

Note that the pin 21 is rotatable relative to at least one of the connecting plate 22 and the support lever 25.

As a result of this, when the adjuster tilter 19 is moved from the idle position to the full position by the same angle, the amount of displacement of the pin 21 and the amount of change in the tension of the main spring 15 gradually become smaller. The same effect as in the example can be obtained.

Further, a third embodiment shown in FIG. 9 will be described.

This shows an example in which the present invention is applied to a maximum and minimum speed governor, and the connecting plate 22 and the tension lever 10 are connected via a rod 26, a main spring 15 and a part load spring 27 each having a set load. You will be contacted.

Note that the other configurations are the same as in the first embodiment.

When the adjuster 19 is moved by a constant angle using a conventional highest and lowest speed governor, the injection amount also changes approximately by a constant amount as shown in FIG. As shown in the figure, when the adjusting lever par 19 is moved to the idling side, the change in the injection amount becomes large, and the relationship between the adjusting lever operating angle and the engine speed becomes as shown by the solid line in FIG. 12.

Therefore, even in this embodiment, the engine start-up characteristics in the low rotation range are improved.

As is clear from the above explanation, the present invention has an excellent effect of improving engine speed surge in a low speed range.

[Brief explanation of drawings]

Fig. 1 is a characteristic diagram of a conventional speed governor, Fig. 2 is a characteristic diagram of a conventional speed governor and a speed governor of the present invention, and Figs.
Fig. 3 is a cross-sectional view, and Fig. 4 is a cross-sectional view of the third embodiment.
A configuration diagram of the main parts seen from direction B in the figure, Figure 5 is C in Figure 3.
6 is an explanatory diagram for explaining the operation, FIG. 7 is a characteristic diagram, FIG. 8 is a diagram of the main part showing the second embodiment, and FIG. 9 is a diagram of the main part as seen from the direction. A configuration diagram of main parts showing the third embodiment, FIG. 10 is a characteristic diagram of another type of conventional speed governor, FIG. 11 is a characteristic diagram of the speed governor shown in FIG. 9, and FIG. 12 is a characteristic diagram of the speed governor shown in FIG. FIG. 3 is a characteristic diagram of a conventional speed governor and a speed governor of the present invention. 5...Fly weight, 10...Tension lever, 15...Main spring, 1
8...Shaft, 20...Throttle lever, 20 a...Elongated hole, 21...Pin,
23... Plate forming a guide member, 25...
・・・・Support lever made of guide member

Claims (1)

[Scope of utility model registration request] An elongated hole is formed in the throttle lever, which rotates around an axis in conjunction with the vehicle's accelerator pedal, and a pin is slidably inserted into this elongated hole to create a tension lever that is rotated by the centrifugal force of the flyweight. A main spring is interposed between the main spring and the pin, and a guide member is provided to define the direction of movement of the pin, so that the pin is moved toward the shaft within the elongated hole as the accelerator pedal is depressed. A governor for internal combustion engines featuring: