JPS6030428Y2 - Engine fuel injection pump idling limit device - Google Patents

Description

[Detailed description of the invention] The present invention relates to an idling restriction device for a fuel injection pump, and by installing a fixed wall of a casing such as a balancer device adjacent to the ice chamber, the pump chamber housing and the fixed wall are connected. To provide an idling restriction device that can be installed in the narrow space even when the space between the two spaces is narrow, and to allow easy and sufficient adjustment operation.

As shown in FIG. 5, the conventional idling restriction device 1B has a structure that is attached to a housing 3 of a pump chamber 2 that is integrally formed with a cylinder block.

In order to prevent the control rack 7 of the fuel injection pump 1 from vibrating unsteadily from side to side when the engine is idling, a case 19 is screwed into the housing 3 of the pump chamber 2 via a lock nut 19a, and a spring is inserted into the case 19. 20
1. Attach the push rod 21 through the holder and screw the spring pressure adjustment screw 22 for adjusting the spring force into the case 19 through the lock nut 22a. The push rod 21 is arranged close to the end surface of the control rack 7 when the engine is idling.

With this structure, the adjustment of the spring pressure adjusting screw 22 is reduced by the amount of the lock nuts 22a and 19a,
Not only cannot a sufficient amount of adjustment be made, but also the lock nut must be tightened and loosened at the time of the adjustment operation, and the adjustment operation is performed on the side.

In this invention, a spring pressure adjustment screw is attached to the pump chamber housing or the fuel pump body, and only the head of the spring pressure adjustment screw is placed in the narrow space between the pump housing and the fixed wall. An adjusting rotor is fitted onto the head so that it can move freely in the direction of the bolt axis and transmit rotation, and the adjusting rotor can be fixed by friction between the pump housing and the fixed wall via an elastic friction body. It is characterized by this.

Next, an embodiment of the present invention will be described based on the drawings.

A fuel injection pump 1 of the engine is installed in a housing 3 of a pump chamber 2 integrally formed with a cylinder block,
It is driven by a camshaft 5 via a fuel cam gear 4 which is operatively connected to a crank gear.

The fuel injection amount of the fuel injection pump 1 is controlled by a control rack 7 via a governor lever 6.

The lower end of the governor lever 6 is a fulcrum 6b, and a governor force generated by a centrifugal type governor device installed in the fuel cam gear 4 acts on a pair of middle pins 6a of the governor lever 6.

Also, the governor lever 6 is operated by the accelerator lever via the governor spring 8, and the governor spring 8 at that time is operated by the accelerator lever.
The control rack 7 of the fuel injection pump 1 is controlled via the rack pin 7a to a position where the tension of the fuel injection pump 1 and the governor force are balanced.

When the engine is idling, the tension of the governor spring 8 is weakened by operating the accelerator lever, and the control rack 7 is brought to a position near the left end side.

At this time, the control rack 7 begins to vibrate from side to side due to an error in the tension of the governor spring 8 on the low tension side.

The idling control device IA for regulating this vibration and ensuring a stable idling state is configured as follows.

Control rack 7 in housing 3 of pump chamber 2
The adjustment bolt 9 is screwed into the position facing the left end of the housing 3, and the adjustment bolt head 9a is thrust into the adjustment operation space 11 between the housing 3 and the fixed wall 10 mounted in the vicinity thereof.

A cylindrical case 12 that is slidably fitted onto the adjustment bolt 9 is fixed to the inner surface of the housing 3, and a push rod 13 is slidably inserted into the center of the right end surface of the case 12, and the case 1
A spring 14 is installed between the spring receiving plate 13a of the push rod 13 and the adjustment bolt 9 in the push rod 2, and the push rod 13 is pressed by the spring 14.

In order to adjust the spring force, a nut-shaped adjustment rotor 15 is fitted onto the adjustment bolt head 9a with a spline fitting so as to be freely slidable and rotationally transmittable. O-rings 16 are installed in the grooves, and both end surfaces of the adjusting rotary body 15 are brought into frictional contact with the housing 3 and the fixed wall 10 via each O1J ring 16, which is an elastic friction body, so that the adjusting rotary body 15 does not rotate freely. Lock it like this.

The tip of the push rod 13 is formed so as to be close to the left end surface of the control rack 7, so that leftward movement of the control rack 7 due to lateral vibration is regulated by the spring 14 via the push rod 13 when the engine is idling. A stable idling condition is maintained by forming the

When adjusting the spring force using the adjusting bolt 9, the hexagonal adjusting rotating body 15 (FIG. 2) is rotated with a spanner to move the adjusting bolt 9 forward and backward.

As a modification of the above embodiment, a part thereof can be changed as follows.

B. In order to adjust not only the spring force of the idling restriction device IA but also the position of the push rod 13, the case 12 is screwed into the housing 3 as shown in FIG.
2a is thrust into the adjustment operation space 11.

Further, the adjustment bolt 9 is screwed into the case 12, and the adjustment bolt head 9a is inserted into the case 1 in the adjustment operation space 11.
2 is arranged between the left end surface and the fixed wall 10.

In order to rotate the case 12 and adjust the position of the push rod 13, a positioning adjustment rotary body 15a is fitted onto the left end 12a of the case 12 in the adjustment operation space 11 in the form of a spline fitting.
The adjusting rotary body 15 is externally fitted onto the adjusting bolt head 9a in the form of a spline fitting.

The two-end adjusting rotors 15 and 15a are formed so as to be in contact with each other at opposite end surfaces, and to be in frictional contact with the housing 3 and the fixed wall 10 via an O-ring 16.

However, it is necessary to make the length of the adjustment bolt head 9a smaller than the length of the adjustment rotary body 15.

When adjusting the rotation of the image adjusting rotary bodies 15 and 15a individually, one is fixed with a spanner while adjusting.

(b) To attach the idling restriction device IA to the pump main body 1a, as shown in FIG. It is made to rush into the operation space 11.

In addition, the adjustment bolt 9 is internally screwed into the case 12, and the adjustment bolt head 9a is inserted into the case 12 within the adjustment operation space 11.
2 and the fixed wall 10.

In addition, the left end 12a of the case 12 in the adjustment operation space 11
and an adjustment rotary body 1 for positioning on the adjustment bolt head 9a.
5a and the adjusting rotary body 15 are spline-fitted so that the position of the push rod 13 can be adjusted with the former and the spring force can be adjusted with the latter.

The image adjustment rotors 15 and 15a are in contact with each other, and
It is locked by frictional contact with the housing 3 and the fixed wall 10 via the ring 16.

Since the present invention is configured as described above, it has the following effects.

1. The head of the adjustment bolt of the idling limiter is arranged in the adjustment operation space, and the adjustment rotor, which is slidably and rotatably fitted to the head, is rotatably frictionally fitted between the housing and the fixed wall. Because of the contact support structure, when adjusting the idling restriction device, it can be easily done by simply adjusting the adjusting rotary body.

Moreover, when no adjustment operation is performed, the rotation of the adjustment rotary body is reliably locked by the frictional force.

2. Since the adjustment operation space only requires the adjustment bolt and the adjustment rotating body fitted onto the adjustment bolt, the adjustment body of the idling restriction device can be made as large as possible within the range of this space.

[Brief explanation of the drawing]

Fig. 1 to Fig. 4 show an embodiment of the present invention, Fig. 1 is a longitudinal sectional front view of the main part, Fig. 2 is a view taken along the line ■-■ of Fig. 1, and Fig. 3 and Fig. 4 are FIG. 5 is a partial view corresponding to FIG. 1 of the embodiment, and FIG. 5 is a partial view corresponding to FIG. 1 of a conventional idling restriction device. IA... Idling restriction device, 1...
・Fuel injection pump, 1a...Fuel injection pump body, 3.Block/Housing, 7...Control rack, 9...Adjustment bolt, 9a...
Adjustment bolt head, 10, curved/fixed wall, 11...
Adjustment operation space, 15... Adjustment rotary body.

Claims (1)

[Scope of utility model registration request] 1 The control rack 7 of the fuel injection pump 1 of the engine is configured to be able to control idling with the idling restriction device IA, and the idling control device 1A is attached to either one of the main body 1a of the fuel injection pump 1 and the housing 3 to which it is fixed. The head 9a of the adjustment bolt 9 of the idling control device IA is thrust into the adjustment operation space 11 between the housing 3 and the fixed wall 10 approaching the housing 3, and the adjustment rotary body 15 is rotated by the adjustment bolt head 9a. An engine characterized in that the adjusting rotary body 9a is fitted externally in a transmission-like manner so as to be freely movable, and is brought into frictional contact with the housing 3 and the fixed wall 10 within the adjusting operation space 11 via elastic friction bodies 16. Idling limiting device 2 for a fuel injection pump of a fuel injection pump In the idling limiting device described in claim 1 of the utility model registration claim, the idling limiting device IA is installed in a housing 3.
Supported by 3. In the idling limiting device described in claim 1 of the utility model registration claim, the idling limiting device 1A is supported by the pump body 1a.