JPH018668Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an injection amount control lever device for a fuel injection pump that supplies fuel to an internal combustion engine of a vehicle or the like.

In a fuel injection pump, the injection amount is increased or decreased by reciprocating a control rack that engages with the pump plunger barrel to vary the effective stroke of the plunger.The control shaft that drives this control rack is controlled by an accelerator via a lever device. connected to the pedal. (Jitsukai 56-15431
2 in the diagram of Fig. 1 indicates a row-type fuel injection pump, and 3 indicates the control shaft of the pump casing 4.
A lever 6 having a dogleg-shaped bell crank 5 attached by bolts or the like is fixed to the shaft end which projects outward.

One end of the bell crank 5 is connected to a driven arm 9 of an intermediate link shaft 8 via a rod 7.
On the other hand, a return spring 10 that biases the control shaft 3 in the closing direction is engaged with the other end and is configured to be freely rotatable about the control shaft 6.

In the intermediate link shaft 8, a shaft portion 11 is rotatably supported by supports 12 and 13 fixed to a thermostat housing (not shown), and is located on the opposite side of the driven arm 9 and substantially perpendicular thereto. An elongated drive arm 14 is integrally formed at the position.

That is, by pulling the drive arm 14 forward (in the direction of the arrow), the bell crank 5 follows and rotates via the driven arm 9, and the injection amount is increased or decreased according to the rotation angle of the control shaft 3. When the drive arm 14 is released, each part returns to its original state by the return spring 10, and the injection amount is maintained at the initial fixed value.

The rotating end of the drive arm 14 is connected to the accelerator pedal 1 via a rod 15 or a wire, and is rotated according to the amount of depression of the accelerator pedal 1.

This controls the injection amount by rotating the control shaft 3. Especially since the drive arm 14 is considerably longer than the passive arm 9,
Subtle control of the injection amount in response to depression of the accelerator pedal 1 is facilitated.

However, even if such a lever device is attached to the injection pump 2 to control the injection amount, there are variations in the structure of the injection pump 2 itself, the set angle (initial set angle), and the characteristics of the operating angle.
In the conventional example, even if the pump is the same model,
When installing, it is necessary to select the length of each part, such as the bell crank 5 and the intermediate link shaft 8, each time, and there is a problem in that parts of various sizes must be arranged. For example, as shown in FIG. 2, if the set angle α of the injection pump 2 is different, the rotation radius of the bell crank 5 may be changed,
If it becomes necessary to change the length L of the rod 7 and the operating angle β differs, it is unavoidable to change the driven arm length l, arm angle γ, etc. of the intermediate link shaft 8 accordingly. Therefore, it is not possible to control the stroke, position, and reaction force of the accelerator within a predetermined appropriate range.

This invention was made in view of these problems, and includes a means for adjusting the setting angle of the pump at the connection between the lever fixed to the control shaft and the bell crank, and an intermediate link shaft for the bell crank 7. By providing a means to adjust the operating angle of the pump at the connection part of the pump, increasing the degree of freedom when installing, problems caused by variations in pumps, etc. can be eliminated, and the injection amount can be easily and appropriately set. The purpose of this invention is to provide an injection amount control lever device that provides a controlled injection amount.

Hereinafter, the present invention will be explained based on the drawings. Third
The figure is a side view showing the main part of an embodiment of the present invention, and FIG. 4 is a partially exploded perspective view thereof.

In FIGS. 3 and 4, a lever 6 with a fitting part 16 is firmly fixed to the shaft end of the control shaft 3 of the injection pump with a tightening bolt 17, and this lever 6 is A dogleg-shaped bell crank 18 is attached to the side.

The bell crank 18 has two bolt holes 1
Two screw holes 2 with 9 and 20 formed in the lever 6
1 and 22, and are assembled and fixed using two bolts 23 that pass through the through holes 19 and 20 and screw into the screw holes 21 and 22, respectively.In this case, the lever 6 The upper bolt through hole 20 is formed into an elongated hole so that the assembly angle can be set relatively freely.

As a result, when installing the bell crank 18, the selection range of the relative position (angle) with respect to the control shaft 3 is expanded, and the selection range of the relative position (angle) between the lever 6 and the bell crank 18 is expanded.
A means for adjusting the pump set angle α is provided at the connecting portion 24 with the pump.

The bell crank 18 is connected to a driven arm 28 of the intermediate link shaft 27 via a rod 26 that engages with a joint ball 25 formed at one end thereof, and the rotation of the intermediate link shaft 27 is controlled by the bell crank. Means for adjusting the pump operating angle .beta. is provided in the middle of the coupling mechanism consisting of the rod 26 and the like, in this case at the coupling portion 29 between the rod 26 and the driven arm 28.

This adjustment means consists of a joint part 30 (preferably a ball joint step bolt or reamer bolt) which is rotatably fitted to the tip of the rod 26, a nut 31 and a driven arm 2 of the intermediate link shaft 27.
The driven arm 28, the rod 26, and the bell crank 18 are connected by inserting the joint part 30 into the long hole 32 and tightening the nut 31. In this case, by appropriately selecting the fixing position of the joint portion 30 with respect to the elongated hole 32, the rotation angle range of the bell crank 18 with respect to the swing θ of the intermediate link shaft 27 can be arbitrarily set, that is, the pump operating angle β can be set as desired. freely adjusted.

Note that the shapes of the driven arm 28 and the elongated hole 32 may be formed into a somewhat arcuate shape. Further, the drive arm 33 of the intermediate link shaft 27 is connected to the accelerator pedal 1 in the same manner as in the conventional example.

With this configuration, the setting angle α of the injection pump 2 can be freely adjusted according to the longitudinal dimension of the bolt through hole 20 formed in the bell crank 18, and the operating angle β can be adjusted freely according to the longitudinal dimension of the bolt through hole 20 formed in the bell crank 18. It can be arbitrarily adjusted within the range of the elongated hole 32 formed in the .

Therefore, even if there are variations in the pump 2 itself as in the conventional example, the lever device can be installed without any problem, and the injection amount can be easily and appropriately set.

Furthermore, there is no need to prepare parts of various sizes and shapes depending on variations in the pump 2, and the same model can be applied to pumps 2 of slightly different sizes.

As a result, pump performance is fully exhibited, injection amount control is maintained well, and reliability of fuel response to accelerator depression is increased.

As explained above, according to the present invention, the degree of freedom when connecting the lever fixed to the control shaft and the bell crank, and the degree of freedom when connecting the bell crank and the intermediate link shaft via the rod are increased. Because of this structure, it can be attached not only to pumps of the same model but also to pumps of slightly different sizes, which simplifies the number of parts and makes assembly easy and reliable. It is possible to reliably adjust the fuel injection amount within an appropriate range, and as a result, the fuel injection amount can be optimally set and controlled, which provides many excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a conventional device, FIG. 2 is an explanatory diagram of its operation, FIG. 3 is a side view showing the main part of an embodiment of the present invention, and FIG. 4 is a partially exploded perspective view thereof. 1...Accelerator pedal, 2...Fuel injection pump, 3...Control shaft, 6...Lever, 10...
...Return spring, 18...Bell crank,
24... Connection portion, 26... Rod, 27... Intermediate link shaft, 28... Followed arm, 29...
Connecting portion, 20...Elongated bolt through hole, 32...
...Elongated hole, 33...Drive arm.

Claims (1)

[Scope of utility model registration request] A bell crank is attached to a lever fixed to the shaft end of the injection amount control shaft, and the rotation of an intermediate link shaft provided to rotate in conjunction with the accelerator pedal is transmitted to the bell crank, and the fuel is rotated accordingly. In an injection amount control lever device for an injection pump, an elongated through hole is formed at the connecting portion between the lever and the bell crank as a means for adjusting the pump set angle, and the other end of the rod is connected to the bell crank at one end. An injection amount control lever device for a fuel injection pump, comprising means for adjusting a pump operating angle by being connected to an elongated hole formed in a radial direction in the driven arm of the intermediate link shaft.