JPS6339418Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fuel injection timing setting device for a fuel injection pump of an internal combustion engine, particularly a diesel engine.

Recently, in response to stricter exhaust gas regulations for diesel engines, measures have been taken to accurately adjust and set fuel injection timing. In this case, there is a risk that the output may be lowered depending on the accuracy of the setting when the desired fuel injection timing is adjusted, and the adjustment is required to be as accurate as possible.

In view of the above-mentioned circumstances, this proposal aims to improve the reading accuracy of the autotimer as much as possible to improve the accuracy of fuel injection timing setting, and includes a bearing part and a pointer part. Attach the support member to the bracket fixed to the fuel injection pump,
An arc-shaped member with teeth carved on its upper surface is attached to the autotimer, and a pinion that meshes with the teeth of the arc-shaped member is fixed to a mounting shaft rotatably supported by the bearing, and also corresponds to the pointer of the pointer section. This is a fuel injection timing setting device for an internal combustion engine, in which a scale plate having an angular scale engraved on its circumferential surface is fixed to the protruding end of the mounting shaft.

The embodiment of the present device will be explained with reference to the drawings.
As shown in FIGS. 1 and 2, a base 3a is attached to the wall 2 of the fuel injection pump 1, and a bracket 3 is fixed above the autotimer 4. Fitting holes 5, 5 are provided therethrough.

Next, the support member 6 is provided. The support member 6 includes an insertion leg 6b extending downward at the rear of the horizontal rod portion 6a;
6b, and the insertion legs 6b, 6b can be inserted into the insertion holes 5, 5 to form a supporting member 6 which is detachable from the bracket 3, and the front end of the horizontal rod part 6a has a bearing part 6c downwardly. form. The bearing portion 6c
A shaft insertion hole 7 is formed in each of the front hanging wall 6d and the rear hanging wall 6e, and both ends of the mounting shaft 8 are rotatably supported in these shaft insertion holes 7, 7. A pinion 9 is attached between the front hanging wall 6d and the rear hanging wall 6e, and the end of the mounting shaft 8 is made to protrude forward from the front hanging wall 6d, and the scale plate 10 is fixed to this protruding end.

The scale plate 10 has a disk shape with an outer circumferential diameter several times the outer diameter of the pinion 9, has an angle scale 11 engraved on its outer circumferential surface, and has a handle 12 protruding from its outer end surface. The pinion 9 can be freely rotated by rotating the intermediate scale plate 10 and rotating the mounting shaft 8.

Also, an angle scale 11 corresponding to the angle scale 11 is provided.
The dial 10 has a pointer 13a that can be read freely.
The base of the pointer section 13 located above is fixed to the front end of the bearing section 6c of the support member 6.

Next, an arc-shaped member 15 is attached to the outer circumferential surface of the autotimer 4, and the arc-shaped member 15 has teeth 14 carved on the upper surface that can freely engage with the pinion 9. As shown in FIG. 2, the arc-shaped member 15 has an arc shape along the outer circumferential surface of the autotimer 4, has a magnet 16 fixedly attached to its lower surface, and has insertion holes 17, 17 drilled in the outer circumferential surface of the autotimer 4.
Knock pins 18, 18 which can be freely inserted and removed are bored in the magnet body 1 through these knock pins 18, 18.
6, the arc-shaped member 15 is positioned at a predetermined position when set on the outer circumferential surface of the autotimer, and the pinion 9 is formed so as to mesh with the teeth 14 carved on the upper surface of the arc-shaped member 15.

The angle scale 11 of the scale plate 10 corresponds to the handle 1.
The arc-shaped member 15 is rotated through the toothed portion 14 that engages with the pinion 9 fixed to the mounting shaft 8.
The rotation angle of the auto timer 4 when the auto timer 4 is rotated integrally with the auto timer 4 can be read, and angle scales 11 are engraved at intervals of, for example, 0.05 degrees to 0.1 degrees.

In the figure, reference numeral 19 denotes a coupling that connects the engine side drive shaft 20 and the autotimer 4 side via a bolt 21 and a nut 22.

Since the present invention is configured as described above, when finely adjusting the fuel injection timing, insert the insertion legs 6b, 6b into the insertion holes 5, 5 of the bracket 3 fixedly installed on the wall 2 of the fuel injection pump 1. The pinion 9 is fitted onto the bearing portion 6c to which the support member 6 is attached and the pointer portion 13 is fixedly attached.
Then, the mounting shaft 8 to which the scale plate 10 is fixed is set to be rotatable, and the arc-shaped member 15 is attached by inserting the dowel pins 18, 18 into the insertion holes 17, 17 drilled on the outer circumferential surface of the autotimer 4. 9 and the teeth 14 of the arc-shaped member 15 are engaged with each other. Next, after removing the bolt 21 and nut 22 and releasing the coupling 19 connecting the autotimer 4 and the engine drive shaft 20, turn the scale plate 10 via the handle 12 while visually checking the angle scale 11 and the pointer 13a. By meshing the pinion 9 with the teeth 14 carved on the upper surface of the arc-shaped member 15, the auto-timer 4 is rotated by the amount of deviation in the fuel injection timing obtained from the dynamic state measurement of the fuel injection timing, etc. After correcting the fuel injection timing, the coupling 19 is fastened via the bolt 21 and nut 22, and the autotimer 4 and the engine drive shaft 20 are connected to complete the desired fine adjustment.

This device rotates the autotimer via a pinion attached to the support member on the fuel injection pump side and an arc-shaped member attached to the outer circumferential surface of the autotimer, and also measures the amount of rotational displacement of the autotimer using a pointer and a dial. Since the angle can be read and fine-tuned with an accuracy of 0.05 degrees to 0.1 degrees immediately, the accuracy of fuel injection timing setting is greatly improved and variations in nitrogen oxide generation, fuel consumption, exhaust gas conditions, etc. are minimized. It has an excellent effect of reducing

[Brief explanation of drawings]

FIG. 1 is a side view of the present device, and FIG. 2 is a right end view of FIG. 1. 1...Fuel injection pump, 3...Bracket, 4
...Auto timer, 6... Support member, 6a... Horizontal rod part, 6b... Insertion leg, 6c... Bearing part, 7...
...Shaft insertion hole, 8...Mounting shaft, 9...Pinion, 1
0... Scale plate, 11... Angle scale, 13... Pointer part, 14... Teeth part, 15... Arc-shaped member, 16...
Magnetic body, 19...Cup ring.

Claims (1)

[Scope of utility model registration request] A support member having a bearing portion and a pointer portion is attached to a bracket fixed to the fuel injection pump, an arc-shaped member having teeth carved on the upper surface is attached to the autotimer,
A pinion that meshes with the teeth of the arc-shaped member is fixed to the mounting shaft rotatably supported by the bearing portion, and a scale plate having an angular scale engraved on the circumferential surface that corresponds to the pointer of the pointer portion is attached to the mounting shaft. A fuel injection timing setting device for an internal combustion engine that is fixed to a protruding end.