JPH0650239A - Fuel injection pump of engine - Google Patents

Abstract

PURPOSE:To simplify mounting and detaching of a fuel injection pump and prevent a falling off trouble of a lock pin by forming an engaging groove into a pinchedly holding part which is contracted smaller than the diameter of a control rack pin on the upper edge of a control rod. CONSTITUTION:At mounting a fuel injection pump 1, before a control rack pin 2a is fitted into the engaging groove 4 of a control rod 3, both ends of a lock pin 5 are inserted into holes 7 and the control rod 3 and the lock pin 5 are fixed together in one body. The opening width of the pinchedly holding part 4b of the lock pin 5 is formed so as to be narrower than the diameter of the control rack pin 2a, the control rack pin 2a is positioned over the engaging groove 4, and the fuel injection pump 1 is brought down as it is. Hereby, the control rack pin 2a is introduced by the guide part of the engaging groove 4 and elastically bitten in the pinchedly holding part 4b of the lock pin 5 integrated with the control rod 3 so as to be fixed to the holding part of the engaging groove 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a fuel injection pump for an engine, and more particularly, to a column-type fuel injection pump having a plunger corresponding to each cylinder so that the individual fuel injection pumps can be easily inserted and removed. It relates to a stopped fuel injection pump.

[0002]

2. Description of the Related Art In a row-type fuel injection pump mounted on an automobile, a method of locking a control rack pin of an individual fuel injection pump to a control rod is generally carried out by controlling a control rod as shown in FIGS. The hole 3a formed in the rod 3 is applied to the control rack pin 2a provided on the rear surface of the control rack 2 that is engaged with the control pinion of the fuel injection pump 1, and is located deeper than the hole 7 formed in the control rack pin 2a. Push it in and insert the straight part 5a of the locking pin 5 into this hole 7
The control rack pin 2a is sandwiched and fixed by 5b.

Further, the individual control rack pins 2a are linked by a control rod 3 and interlock with each other to control the amount of fuel injection, and the injection which is connected to the tip of the injection pipe 10 by the cam 9 on the cam shaft 8 is controlled. The timing of injecting fuel from the nozzle is controlled. The control rack pin 2a, the control rod 3 and the like prevent the dust from adhering or rusting, or the external force is applied to them to cause a malfunction as proposed in Japanese Utility Model Laid-Open No. 48-17517. It is housed inside the cylinder head because it must be prevented.

[0004]

However, in the case of connecting the control rack pin and the control rod by the above method, the individual fuel injection pumps are arranged at the predetermined installation positions and the holes of the control rod are arranged. Is positioned so that it can be inserted into each control rack pin protruding on the side surface of the fuel injection pump, the control rod is fitted from the side of this fuel injection pump, and the control rack pin and control rod are further connected by the locking pin. They have to be fixed one by one, which is a very troublesome assembly work.

When the fuel injection pump is inspected or repaired, all the locking pins are once removed from the holes of the control rack pins, the control rod is pulled out from the control rack pins, and then the fuel injection is performed. It is necessary to lift the pump up and take it out, and after checking and repairing, assemble it in the reverse order. This work must be done even when only one specific fuel injection pump is checked and repaired. However, there was a problem that the work was very inefficient.

Further, in the case of such a locking method, it is often the case that the locking pin is accidentally dropped while the fine work of the fingertip is continued, and the locking pin falls into the cylinder body. However, if it gets inside the oil gallery, it is very difficult to take out. And
When performing inspection or repair work, there is a problem that the locking pin covered with oil in the cylinder head is slippery and is more likely to be dropped into the cylinder body than during manufacturing.

Further, it is necessary to form an opening on the side wall of the cylinder head for putting in a finger to perform an assembly operation.
When forming such an opening, increase the wall thickness in order to maintain the strength of this part, and further seal it with a sealing member and a lid on the outside of the opening to keep it oil-tight. There is a problem that the width of the cylinder head is increased and the weight is also increased because of the necessity of sealing.

In view of the above problems, the present invention makes it extremely easy to insert and remove the fuel injection pump, and prevent accidents such as dropping the locking pin into the cylinder body. An object of the present invention is to provide an excellent fuel injection pump that does not require forming an opening for work in the cylinder head.

[0009]

In order to achieve the above object, an engine fuel injection pump according to the present invention engages with and interlocks with control rack pins of individual fuel injection pumps that feed fuel to injection nozzles. An engaging groove having a control rod, and an engaging groove into which the control rack pin is fitted is opened at an upper edge of the control rod, and the engaging groove has a part whose opening width is smaller than the diameter of the control rack pin. Is formed.

[0010]

[Operation] The present invention has the above-described structure. When mounting the fuel injection pump, the control rack pin is positioned above the engaging groove opened at the upper edge of the control rod and lifted. By simply lowering the fuel injection pump that was used, the control rack pin is fitted into the engaging groove of the control rod and is elastically bitten and locked by the sandwiching part, so it is an extremely easy work to assemble. You can In addition, when removing the fuel injection pump, you can remove the control rack pin from the clamping part by simply lifting the fuel injection pump upward, so you do not have to touch the control rod or control rack pin. Further, even when only one specific fuel injection pump is inserted / removed at the time of inspection / repair, etc., it can be easily performed only by the above operation.

As described above, since it is no longer necessary to insert and remove the retaining pins one by one into the individual fuel injection pumps, it is possible to prevent accidents where the retaining pins are accidentally dropped into the cylinder body. Further, since it is not necessary to form an opening in the side wall of the cylinder head for fitting and removing the fuel injection pump, the size and weight of the engine can be reduced.

[0012]

EXAMPLES Examples of the present invention will be described with reference to the drawings. 1 to 5 show a first embodiment of the present invention, which engages with each control rack pin 2a provided on the rear surface of the control rack 2 which meshes with the control pinion of the individual fuel injection pump 1, An engaging groove 4 is opened upward at the upper edge of the control rod 3 for interlocking this, and locking pins 5 are provided on both sides of the engaging groove 4.
A hole 7 for inserting the is formed. First, the control rack pin 2a is inserted into the engaging groove 4 of the control rod 3.
Prior to fitting, the both ends of the locking pin 5 are inserted into the hole 7 and fixed so that the control rod 3 and the locking pin 5 are integrated. Then, by aligning the position of the control rack pin 2a above the engagement groove 4 and lowering the fuel injection pump 1 as it is, the control rack pin 2a is introduced by the guide portion 4a of the engagement groove 4, and this control A holding portion of the engaging groove 4 which is elastically engaged with the holding portion 4b of the locking pin 5 which is integrated with the rod 3.
It is fixed at 4c.

The opening width B of the holding portion 4b of the locking pin 5 is
Is formed to be narrower than the diameter L of the control rack pin 2a. When the fuel injection pump 1 is attached, the elastic force of the locking pin 5 is used to expand the holding portion 4b for control. Push in the rack pin 2a. Further, the width A of the holding portion 4c of the engaging groove 4 is set to be slightly larger than the diameter L thereof so that the control rack pin 2a does not rattle when the control rack pin 2a is fitted. Further, the control rack pins 2a of the respective fuel injection pumps 1 are linked so as to interlock with each other by the control rod 3, and the injection amount is controlled by moving the control rod 3 in the left-right direction in FIG. The timing of delivering fuel to the injection pipe 10 is controlled by the cam 9 on the shaft 8.

FIGS. 6 and 7 show a second embodiment of the present invention, in which the locking pin 5 is of a type which is fixed separately on both sides of the engagement groove 4 and is fixed on both sides of the engagement groove 4. Both ends of each locking pin 5 are fitted into two holes 7 formed in the vertical direction, and the folded portions of the locking pins 5 face each other to form a holding portion 4b, which is integrated with the control rod 3. It is fixed so that it will be correct. Also in this case, similarly to the first embodiment, the control rack pin 2a is engaged with the holding portion 4b of the locking pin 5, and the holding portion 4c below the holding portion 4b.
Fixed to. The control rack pin in this case
The relationship between the width L of the holding portion 4c of the engagement groove 4 and the opening width B of the holding portion 4b with respect to the diameter L of 2a is the same as in the first embodiment.

Next, FIGS. 8 and 9 show a third embodiment of the present invention. In this case, the locking pin 5 is formed by fixing rod-shaped pins 5c at both ends of the corrugated plate 6, and is formed in two holes 7 vertically formed on one side of the engaging groove 4. The ends of the pins 5c are fitted in and fixed to the control rod 3 to be integrated. Then, when the control rack pin 2a is engaged in the engagement groove 4, the upper convex portion 6a of the corrugated plate 6 forms the holding portion 4b, and the control rack pin 2a and the concave portion 6b and the concave portion 6b are formed. It is fixed in a state of being sandwiched by the facing engaging grooves 4. In this case, since the control rack pin 2a is pressed by the engagement groove 4 by the elasticity of the corrugated plate 6, the control rack pin 2a
A lateral clearance between the engaging groove 4 and the engaging groove 4 can be reduced, and the control rod 3 can be locked with respect to the lateral movement without rattling.

FIGS. 10 and 11 show a fourth embodiment of the present invention, in which the holding pin 5 is not used and the holding groove 4b is formed in the engaging groove 4 itself of the control rod 3. Yes, the elasticity of the control rod 3 itself is used to engage the control rack pin 2a in the engagement groove 4 and
It is locked to 4c. As described above, in any of the embodiments of the present invention, the position of the control rack pin 2a of the fuel injection pump 1 is aligned above the engagement groove 4 opened at the upper edge of the control rod 3, By simply lowering the fuel injection pump 1, the control rack pin 2a is introduced by the guide portion 4a of the engagement groove 4, and the holding portion 4b is inserted.
Is elastically bitten by and is locked by the holding portion 4c. On the contrary, when removing the fuel injection pump 1, the control rack pin 2a can be removed from the holding portion 4b of the control rod 3 only by lifting the fuel injection pump 1 upward. It can be removed very easily without touching. The fuel injection pump 1 of the present invention is not limited to the above embodiment, but is fitted into the engagement groove 4 formed in the control rod 3, and is formed integrally with the control rod 3 itself. It suffices that the fuel injection pump 1 is elastically bitten and fixed by a sandwiching portion 4b provided on a locking member such as a locking pin 5 and locked in a state where it can be easily fitted and removed. . In addition, it is preferable that the engagement groove 4 has an opening portion that opens upward with a large opening angle because alignment at the time of mounting can be facilitated.

[0017]

The engine fuel injection pump according to the present invention has a control rod that engages with and interlocks with the control rack pins of the individual fuel injection pumps that feed fuel to the injection nozzle. An engaging groove into which the control rack pin is fitted is opened at the edge, and the engaging groove has a sandwiching portion whose opening width is partly smaller than the diameter of the control rack pin. be able to.

When mounting the fuel injection pump, the control rack pins projecting to the side surface of each fuel injection pump are positioned so as to be positioned above the engaging groove opened at the upper edge of the control rod, and By simply lowering the fuel injection pump from the state, the control rack pin is elastically engaged and locked by the holding portion of the control rod. Also, when removing this fuel injection pump, the control rack pin can be removed from the holding part of the control rod simply by lifting it up, so it is extremely easy without touching the control rod or control rack pin. It can be removed by operation.

Further, since the work for fitting and removing the locking pin is not necessary, it is possible to prevent an accident that the locking pin is accidentally dropped into the cylinder body, and further the work for fitting and removing the fuel injection pump is performed. Since it is no longer necessary to form an opening in the side wall of the cylinder head, it is possible to contribute to the reduction in size and weight of the engine.

[Brief description of drawings]

FIG. 1 is a perspective view of a control rod and a locking pin according to a first embodiment of the present invention before assembly.

FIG. 2 is a perspective view after assembling the control rod and the locking pin according to the first embodiment of the present invention.

FIG. 3 is a perspective view after the fuel injection pump according to the first embodiment of the present invention is attached.

FIG. 4 is a diagram showing dimensions of a locking portion of a control rack pin according to the first embodiment of the present invention.

FIG. 5 is a side view showing an attached state of the connected fuel injection pumps of the present invention.

FIG. 6 is a perspective view of a control rod and a locking pin according to a second embodiment of the present invention before assembling.

FIG. 7 is a diagram showing dimensions of a locking portion of a control rack pin according to a second embodiment of the present invention.

FIG. 8 is a perspective view of a control rod and a locking pin according to a third embodiment of the present invention before assembling.

FIG. 9 is a diagram showing dimensions of a locking portion of a control rack pin according to a third embodiment of the present invention.

FIG. 10 is a perspective view of a control rod according to a fourth embodiment of the present invention.

[Fig. 11] Fig. 11 is a diagram showing dimensions of a locking portion of a control rack pin according to a fourth embodiment of the present invention.

FIG. 12 is a perspective view of a conventional control rod and a locking pin before assembly.

[Fig. 13] Fig. 13 is a side view showing a mounting state of a conventional connected fuel injection pump.

[Explanation of symbols]

1 Fuel injection pump 2a Control rack pin
3 Control rod 3a Engagement groove 4 Holding part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazunori Asada 2400 Kamigo, Ebina City, Kanagawa Prefecture Automotive Department, Product Industry Co., Ltd. (72) Inventor Shinichiro Fujita 2400 Kamigo, Ebina City, Kanagawa Prefecture Automotive Department Product Industry Co., Ltd.

Claims (1)

[Claims] 1. A control rod for engaging and interlocking with a control rack pin of an individual fuel injection pump for feeding fuel to an injection nozzle, and an engagement for fitting the control rack pin to an upper edge of the control rod. A fuel injection pump for an engine, wherein a groove is opened, and the engagement groove has a sandwiching portion whose opening width is partially smaller than the diameter of the control rack pin.