JPH044247Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a governor mechanism for an engine. Figures 1a and 1b show a conventional governor device for a fuel injection pump; 1 is a fuel injection pump, 2 is a stopper spring, 3 is a tie rod, 4 is a governor lever, 5 is a governor weight assembly, 6 is a sliding shaft, and 7 is a Gear case, 8 is governor shaft, 9 is pump gear, 10 is pump camshaft, 11 is idle gear, 12 is needle bearing, 13
is the needle bearing, 14 is the governor spring, 15
is the speed control lever.

A governor weight assembly is fixed to the pump gear 9 with bolts or the like, and the governor weight 5a (Fig. 2) is adjusted in proportion to the engine speed.
is opened outward by centrifugal force as shown by the broken line and pushes out the sliding shaft 6. This lift amount is engaged with a control rack (not shown) that controls the injection amount of the injection pump, thereby controlling the fuel supplied to the engine and controlling the engine speed.

FIG. 2 shows a governor weight assembly, in which a governor weight 5a is directed to a weight support 5c by a weight pin 5b. FIG. 3a shows a weight support 5c formed by punching and bending a sheet metal, and in this case, the weight pin 5b is caulked after insertion to prevent the pin from falling off. FIG. 3b shows an example of a weight support 5c made of cast iron or a forged product by machining.In this case, a snap spring 5d is installed to prevent the weight pin 5b from falling off.

Next, the operation of the conventional example will be explained.

The governor weight 5a of the governor weight assembly attached to the pump gear 9 or the rotating body must open and close smoothly using the weight pin 5b as a fixed axis (the solid line in Figure 2 shows the weight closed state, and the broken line shows the weight open state). .

FIG. 4 shows the governor weight assembly rotating clockwise in the direction of the arrow in FIG. 2, and FIG. As shown in the figure, the governor weight 5a opens and closes around the weight pin 5b while being pressed against one side of the weight support 5c. Therefore, as mentioned above, the governor weight 5
a needs to smoothly open and close around the weight pin 5b and also need to slide smoothly on the inner surface A of the weight support 5c.

Therefore, in order to operate the inner surface of the weight support 5c smoothly, it is necessary to carefully finish the inner surface A of the weight support 5c by machining a cast iron or forged product as shown in FIG. 3b, which increases the cost. On the other hand, when the weight support 5c is made of sheet metal, it is necessary to precisely form the bending angle θ of both support parts at right angles as shown in FIG. It is necessary to carefully carry out the following.If there are variations in the angle θ or burrs 5c' and 5c'' remain, the weight 5a will not operate smoothly and the engine speed will not be able to be controlled sufficiently.
Problems such as hunting may occur.

An object of the present invention is to solve the above-mentioned problems, and to provide a governor mechanism in which there is little frictional resistance between the governor weight and the inner surface of the governor support even when the governor weight is strongly pressed against the inner surface of the governor support, and the processing cost is low.

The governor mechanism of the present invention has a governor weight rotatably mounted around a weight pin between U-shaped weight supports, and an annular member having a central insertion hole at the joint between the weight support and the weight. The above object is achieved by inserting the weight into at least one side of the weight.

An embodiment of the engine governor mechanism according to the present invention will be described below with reference to the drawings.

Here, the same or equivalent components as those of the conventional device will be described using the same reference numerals.

FIGS. 1a and 1b are sectional views of essential parts of the governor mechanism of a fuel injection pump. In the figures, 5 is a governor weight assembly, which is driven by a camshaft 10. FIG. 2 is an enlarged view of only the governor weight assembly 5, FIG. 4 is a view taken in the direction of the arrow in FIG. 2, FIG.
FIG. 7 is a sectional view corresponding to FIG. 5 showing the governor mechanism according to the present invention.

A governor weight 5a is rotatably mounted around a weight pin 5b between U-shaped weight supports 5c that rotate together with the camshaft 10 (see FIG. 1a). An annular member 16 having a pin insertion hole is inserted between the joint surfaces of the weight support 5c and the weight 5a, and even when the governor weight 5a is pressed against the weight support 5c as shown in FIG. This prevents the side surface of the weight 5a from coming into full contact with the weight support 5c.

Further, if oilite metal (oil-impregnated bearing metal) is used as the annular member 16, even greater effects can be expected.

With this configuration, even when the weight support 5c is made of sheet metal, the sixth
Even if there are variations in the bending angle θ of the support part shown in the figure and some punching burrs remain in parts 5c' and 5c'', there is no fear that these will directly join to the governor weight 5a, and the governor weight 5a can be smoothly slid. The joint surface of the governor weight 5a is limited to the surface of the shim 16, and by reducing the external dimensions of the annular member 16, the joint area can be made smaller than when directly joined to the weight support 5c. This makes it possible to reduce frictional resistance, smooth the operation of the weight, and make the weight support made of inexpensive sheet metal.

As mentioned above, in the governor mechanism of the present invention, an annular member having a pin insertion hole in the center is inserted between the weight support and the weight at least on one side of the governor weight, so the weight support can be replaced with an inexpensive sheet metal. By reducing the external dimensions of the annular member even when manufactured by manufacturing, even if there are variations in the bending angle θ of the support part or punching burrs remain in the fitting hole of the weight pin 5b, these can be directly joined to the governor weight. The frictional resistance between the governor weight and the governor weight can be reduced without interfering with the smooth sliding of the governor weight, and the production cost of the governor mechanism can be reduced.

[Brief explanation of drawings]

Figures 1a and b are sectional views of the main parts of the governor of the fuel injection pump, Figure 2 is a front view of the governor weight assembly, and Figure 3a is a cross-sectional view of Figure 2 (in the case of a sheet metal weight support). , Figure 3b is a cross-sectional view of the same (in the case of a cast or forged weight support), Figure 4 is a view taken in the direction of the arrow in Figure 2, Figure 5 is a cross-sectional view of Figure 4, and Figure 6 is a sheet metal view. FIG. 7 is a front view of the manufactured weight support and a sectional view of the main part of the governor weight part according to the present invention. 5a... Governor weight, 5c... Supporting member (governor support), 16... Annular member.

Claims (1)

[Scope of utility model registration request] In a governor mechanism that controls engine speed, a governor weight is rotatably attached around a weight pin between U-shaped weight supports attached to a rotating shaft, and a pin is attached between the weight support and the governor weight. A governor mechanism characterized in that an annular member having an insertion hole is inserted into at least one side of a governor weight.