JPS59694B2 - automatic timer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to automatics and timers used in diesel engines.

This type of automatic has a diesel timer.

In order to obtain fuel injection timing appropriate for the engine speed, that is, to automatically advance the fuel injection timing as the engine speed increases, it is installed on the fuel, injection, and pump cam shafts and drive sides. The phase of the cam, shaft, and engine pump drive shaft is changed using flywheels and weights in response to changes in the engine's rotational speed. The automatic timer is
Normally, from a stationary state to an engine speed of 600 rpm, the mounting load of the timer spring is made larger than the centrifugal force of the fly weight, so that the fly and the weight maintain contact without being lifted from the stopper.

In addition, when using this type of automatic or timer, the fuel injection timing is not adjusted to match the engine speed when starting at low temperatures or during yard running, so there is no unburned fuel in the diesel or engine exhaust. It contains a large amount of hydrocarbons, generates exhaust odor and white smoke, and pollutes the atmosphere, which is undesirable.

On the other hand, during such low-temperature startup and yard running, the content of unburned hydrocarbons, etc. in the diesel engine exhaust gas is reduced by advancing the fuel injection timing. An object of the present invention is to provide a diesel engine that can obtain fuel injection timing suitable for the engine so as to improve startability at low temperatures and reduce the content of unburned hydrocarbons in the exhaust during yard running. Automatics and timers are provided for this purpose.

For this purpose, the automatic timer of the present invention has a stopper that regulates its resting position.

The fly whose lift position is regulated by a spring, the cam of the fuel injection pump by a weight,
The phase of the shaft and the pump drive shaft of the engine is changed, and a temperature-sensitive container containing a thermal expansion medium is attached to one of the fly, weight, and stopper.
And contact position. Setting. The adjuster is moved in response to the expansion and contraction of the thermal expansion medium, which prevents the fly from collapsing during low-temperature startup and idling. The static contact position between the weight and the stopper is changed. The automatic device according to this invention will be described below. A desirable example of the timer will be described with reference to the drawings.

Figures 1 and 2 are diesel automobiles. 10 specific examples of the automatic timer of this invention applied to an engine
It shows.

This automatic timer 10 is the cam of the fuel injection pump. A fly weight holder 11 attached to a shaft (not shown) and a pair of bearings of the holder 11. On pin 12? A pair of fried flies. weight 1
3, a flange 15 attached to the pump 1 drive shaft (not shown) of the engine, and a fly. A pair of legs 16 of the flange 15 that are in contact with the curved surface 14 of the weight 13 and the bearing. and a pair of timer springs 1r arranged between the automatic pin 12 and the automatic timer spring 1r. Timer 10 flies when starting at low temperatures and when idling. weight. Stopper 18 of holder 11 and fly. Means for changing the static contact position with the weight 13 is provided.

Stopper 18 and fly. As can be understood from FIG. 2, the means for changing the stationary contact position with the weight 13 includes a temperature-sensitive container 20 containing wax 21 as a thermal expansion medium, contacts, positions. Setting adjuster 2
2 and a balance spring 23.

The temperature-sensitive container 20 is used for frying. It is placed in the recess 19 of the weight 13 and has its bottom wall 24 welded to the fly weight 13.

Further, the temperature-sensitive container 20 has a needle hole 26 formed in its top wall 25, so that the needle 2r of the adjuster 22 can be inserted into the container. Contact position setting. The adjuster 22 has a chuck-shaped cross section, with a needle 27 welded to an upper flange 28 and a lower flange 29 abutting the stop 18.

Further, the balance spring 23 is disposed between the upper flange 28 of the adjuster 22 and the recess 19, and always acts on the adjuster 22 so that the lower flange 29 of the adjuster 22 is in contact with the stopper 18. Since the automatic timer 10 is configured in this way, if the temperature of the outside air is low, the wax 21 will contract and the needle 2r will be pushed into the temperature-sensitive container 20 by the Hei spring 23. , contact, position. Setting・
The rear flange 29 of the adjuster 22 is pushed down and the fly. A fly weight 13 that protrudes from the lower surface 30 of the weight 13 by a distance 1 and that corresponds to the temperature of the outside air at that time.
By changing the stationary contact position between the stopper 18 and the stopper 18, the fuel injection timing of the fuel injection pump (not shown) is advanced during cold startup and idling.

Further, if the temperature of the outside air rises, the wax 21 expands, and the needle 2r is pushed out of the temperature-sensitive container 20, causing the contact. position. Setting. The adjuster 22 moves upward against the balance spring 23, causing the lower flange 29 to fly. Make it the same as the lower surface 30 of the weight 13. Therefore, this automatic. Timer 10 is a conventional automatic. It works the same as a timer. Third
The figure shows the automatic system shown in Figures 1) and 2. timer 1
0 fries. This is a modification of the means for changing the static contact position between the weight 13 and the stopper 18, and is a fly.
A temperature-sensitive container 20 that is fitted into the mounting hole 31 of the weight 13 and has wax 21 sealed therein, and a needle hole 2
6 into the temperature-sensitive container 20 and the contact position rotated by the needle 32 around the pin 35. Setting. It consists of a lever 33 as an adjuster and a balance spring 36 that presses the upper end of the lever 33 against the needle 32. The lever 33 has a lower end located within an opening 37 that communicates with the mounting hole 31, and has a cam surface 34 formed at the lower end.

Further, the balance spring 36 is screwed into the mounting hole 31 and placed between the cap 38 and the upper end side of the lever 33.

If the outside air temperature is now low, the wax will contract and the balance spring 36 will cause the needle 32 to move into the temperature sensitive container 2.
The lever 33 rotates around the pin 35 and the cam surface 34 of the lever 33 is pushed into the fly. weight 13
A frying pan that protrudes from the lower surface 30 of the fly according to the temperature of the outside air at that time. The stationary contact position between the weight 13 and the stopper 18 is changed to advance the fuel injection timing of the fuel injection pump during cold start and idling.

Furthermore, if the temperature of the outside air rises, the wax 521 expands, and the needle 32 is pushed out of the temperature-sensitive container 20, causing the lever 33 to resist the balance spring 36 and move the pin 35.
rotates around the cam surface 34 and flies the cam surface 34. weight 13
above the lower surface 30 of.

Therefore, this automatic. Timer 1 (10 is a conventional automatic. It operates in the same way as a timer. Figure 4 is the automatic timer shown in Figures 1 and 2) and Figure 3. Timer 10 fly. This is a further modification of the means for changing the stationary contact position between the weight 13 and the stopper 18, and is arranged on the stopper side.

This stationary contact position changing means connects the temperature sensitive container 40 fixed to the mounting portion 39 of the stopper 18 and the contact. position. Setting. It includes an adjuster and a circular ring 41 made of a plate spring.

The temperature-sensitive container 40 consists of a cylinder 42 with one end open, and a bellows 44 positioned within the cylinder 42 and welded to the open end of the cylinder 42.
Enclose wax 21 inside 2. "are doing.

Further, the ring 41 is welded to the bottom wall 43 of the cylinder 42.

Further, the ring 41 is connected to a bellows 44 via a connecting rod 46. That is, one end of the connecting rod 46 is attached to the bottom wall 45 of the bellows 44, and the other end of the connecting rod 46 is attached to the ring 41.
The ring 41 is welded to the wax 2.
It is deformed according to the expansion and contraction of 1.

The outer diameter of this ring 41 is configured to be equal to the outer diameter of the stopper 18 at room temperature. 39 Now, if the outside temperature is low, the wax 21 will contract and the bellows 4 will
4 is extended, the ring 41 is deformed via the connecting rod 46, and the fly. The annular outer circumferential portions 4r and 48 that are in contact with the lower surface 30 of the weight 13 are protruded 4 (5) to the outside of the outer circumferential surface of the stopper 18, and the fly weight 13 and the stopper 18 are formed in accordance with the temperature of the outside air at that time. By changing the stationary contact position with the fuel injection pump, the fuel injection timing of the fuel injection pump is advanced during cold startup and idling.Furthermore, if the temperature of the outside air rises, the wax 21 expands and the bellows 44 is compressed. As a result, the ring 41 is deformed via the connecting rod 46, and the outer peripheral portions 4r, 48 of the ring that are in contact with the lower surface 30 of the fly weight 13 are retracted inside the outer peripheral surface of the stopper 18.

Therefore, this automatic timer 10 is a conventional automatic timer. It works the same as a timer. With this invention, which has the above structure, it is possible to improve starting performance at low temperatures and advance the injection timing of the fuel injection pump to suit the engine during idling, thereby reducing the content of end-burning hydrocarbons in the exhaust gas. Diesel also reduces air pollution by reducing exhaust odor and white smoke. An automatic timer for the engine is obtained.

[Brief explanation of drawings]

Figure 1 shows an automatic device according to this invention. A concrete example of a timer is shown on one fly. FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. 1, and FIG. 3 is a cross-sectional view with the weight side omitted, and FIG. ．． FIG. 4, which is a sectional view of the stationary contact position changing means between the weight and the stopper, corresponds to FIG. 1, and shows a further modified fly. FIG. 3 is a cross-sectional view of a stationary contact position changing means between a weight and a stopper. 10...Automatic timer, 11...Fly. weight. Holder, 12...Bearing. pin, 1
3... Fly 3 weight, 14... Curved surface, 15...
・Flange, 16...leg, 1r...timer. Spring, 18... Stopper, 19... Recess, 20, 4
0...Temperature-sensitive container, 21...Wax, 22...Contact, . Position setting adjuster, 2
3...Equilibrium spring, 26...Needle hole, 2r
, 32... Needle, 33... Lever, 36...
Balance spring, 41... circular ring, 42... cylinder, 4
4...Bellows, 46...Connecting rod.

Claims (1)

[Claims] 1 In a device that changes the phase between the cam shaft of the fuel injection pump and the pump drive shaft of the engine using a fly weight whose static position is regulated by a stopper and whose lift position is regulated by a timer spring, an internal A temperature-sensitive container enclosing a thermal expansion medium is attached to one of the fly weights and the stopper, and a contact position centration adjuster is moved in accordance with the expansion and contraction of the thermal expansion medium, so that during cold start-up and an automatic timer characterized in that the static contact position between the fly weight and the stopper is changed during idling.