JPH045705Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a device for limiting the amount of fuel injected in a governor of a fuel injection pump.

[Conventional technology]

A conventional governor imitation will be briefly explained based on FIGS. 3 and 4.

FIGS. 3 and 4 are schematic structural diagrams showing the structure of a conventional governor in which the full cam 1 limits the fuel injection amount at full load. Even at full load, the fuel injection amount is regulated by a follower 3 connected to a control rack 2 of a fuel injection pump (not shown) moving the cam surface 1a of the full cam 1 up and down in accordance with the rotational speed of the pump. The relative position of the full cam 1 with respect to the follower 3 can be adjusted by two bolts 4 and 5 that suspend the full cam 1 from the housing, and an adjustment bolt 7 that engages with a block 6 that supports the bolts 4 and 5. It is.

FIG. 5 shows an example of the control rack position A and fuel injection amount control pattern B at full load, which can be obtained by the governor having the above structure. The fuel injection amount at full load is adjusted from outside the governor using the adjustment bolt 7, but by tightening the bolt 7, the block 6 moves to the left in the figure, and the characteristics change from the solid line in Figure 5. Move approximately parallel to the broken line. As described above, in conventional pumps, the full-load injection amount, that is, the maximum injection amount, of the pump is adjusted to an appropriate value for each engine using an adjustment bolt or the like from outside the governor, and then the adjustment bolt is sealed with a wire or the like. However, since the above-mentioned system can be adjusted from the outside, there is a potential problem in that the user may remove the seal and increase the injection amount beyond the appropriate value, causing damage to the engine.

[Problem that the invention attempts to solve]

The present invention has been developed in view of the above points, and by providing a mechanism inside the fuel injection pump that limits the injection amount of the fuel injection pump to less than the maximum injection amount that the engine allows, it is possible to avoid engine overload operation. The purpose is to protect from

(Means for solving the problem) The present invention uses a full cam to control the fuel injection amount of the fuel injection pump during full load, and an external adjustment bolt that allows the position of the block that supports the full cam to be adjusted from the outside. In the governor for an internal combustion engine, the position of the full cam is adjusted by adjusting the position of the full cam, wherein a regulating member interposed between the block and the housing is provided on the outer periphery of a shaft that supports the block in the housing. The maximum injection amount by the full cam is limited to less than the maximum injection amount allowed by the engine by regulating the maximum movement position of the block adjusted by the external adjustment bolt with this restriction member.

〔Example〕

Next, a first embodiment of the present invention will be described based on FIG.

A slidable block 6 is provided on a shaft 8 supported at both ends by a housing 9. The block 6 adjusts the injection amount by moving from side to side in the figure by means of a spring 11 whose one end is supported by a housing 9 and an adjustment bolt 7. The above configuration is substantially the same as the conventional one.

A bottomed hole 6a having a diameter larger than the outer diameter of the spring 11 is formed in the block 6 along the shaft 8. A spacer 10 is provided in this hole 6a.
The spacer 10 has one end supported by the housing 9 and has a cylindrical shape on the outer periphery of which the block 6 can slide. One end of the spacer 10 is supported by the housing 9 and has a spring 11 inside the housing 9.
The other end of the spacer 10 contacts the bottom of the hole 6a of the block 6 to restrict movement of the block 6 to the left in the figure. The length of the spacer 10 in the axial direction is set corresponding to the position of the block 6 when the maximum injection amount is allowed by the engine, and during normal adjustment, the length is set between the bottom of the hole 6a of the block 6 and the end of the spacer 10. There is a clearance C, which is an adjustment margin, between the two.

Therefore, even if the adjustment bolt 7 is screwed in to move the block 6 to the left in the figure to increase the injection amount, the block 6 will move to the left by the clearance C. Since the pump comes into contact with the spacer 10 and its movement is restricted, the pump does not exceed the maximum injection amount allowed by the engine. That is, since the injection amount of the pump is always set to be less than the maximum injection amount, problems such as engine damage are solved.

(Effects of the invention) As described above, according to the invention, the maximum movement position of the block by the external adjustment bolt is regulated by the regulating member. That is, the block is only moved in the direction of increasing the injection amount by the amount of adjustment margin provided by the external adjustment bolt, and the injection amount at full load can always be limited to less than the maximum injection amount allowed by the engine. Moreover, since the regulating member is arranged on the outer periphery of the shaft that fixes the block to the housing,
At the time of assembly adjustment, the size of the regulating member can be easily set by selecting the dimensions, and there is no need to remove external adjustment bolts for the adjustment, and the structure is simple and the work is extremely easy.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the main part showing the first embodiment of the present invention, Figs. 2 and 3 are structural schematic diagrams and a cross-sectional view of the main part showing the structure of a conventional governor, and Fig. 4 is a cross-sectional view of the main part showing the structure of a conventional governor. FIG. 4 is a diagram for explaining the operation when adjusting the injection amount. 1...Full cam, 2...Control rack,
6... Busk, 7... Adjustment bolt, 9... Housing, 10... Spacer, 11... Spring.

Claims (1)

[Claims for Utility Model Registration] The fuel injection amount of the fuel injection pump at full load is controlled by a full cam, and the position of the block that supports this full cam is adjusted by an external adjustment bolt that can be adjusted from the outside. In the governor for an internal combustion engine, the position of the full cam is adjusted by adjusting the position of the full cam. A governor injection amount control device characterized in that the maximum injection amount by the full cam is limited to less than the maximum injection amount allowed by the engine by regulating the maximum movement position of the block adjusted by the external adjustment bolt. .