JPH0311415Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a fuel injection pump for a diesel engine.

Prior Art A fuel injection pump as shown in FIG. 1 is known. That is, the plunger barrel 3 is fitted into the hole 2 of the pump housing 1, the plunger 7, which is slid by the cam 5 provided on the camshaft 4 and the tappet 6, is fitted into the plunger barrel 3, and the plunger barrel 3 is inserted into the plunger barrel 3. Fuel is sucked into the chamber 9 through the supply hole 8, and is pressurized and fed by the plunger 7. At the same time, the notch 11 of the control sleeve 10 fitted into the plunger barrel 3 is fitted into the corner 12 of the plunger 7, and the control sleeve A fuel injection pump is known in which the relative positional relationship between the reed 14 and the supply hole 8 is changed by rotating the plunger 7 by rotating the plunger 10 with a control rack 13, thereby increasing or decreasing the amount of fuel injected.

In such a fuel injection pump, it is necessary to move the control rack 13 with a smaller force than from the outside.

Therefore, the annular groove 1 of the hole 2 of the pump housing 1
An annular spring holder 17 is brought into contact with the snap spring 16 fitted to the tappet 5, and a spring 19 is provided between the spring holder 17 and the spring holder 18 which is brought into contact with the lower step 7a of the plunger 7. The spring 19 for the plunger 7 is pressed against the control sleeve 10 so that it does not interfere with the control sleeve 10, so that the control rack 13 can be moved with a smaller force than the outside.

However, with this structure, the mounting strength of the spring receiver 17 is weak and cannot reliably support the spring force of the plunger spring, and when disassembling and reassembling, the snap spring 16 must be installed and removed within the hole 2 of the pump housing 1. , the work is troublesome,
Moreover, since special tools are required, disassembly and assembly are troublesome.

Purpose of the invention It is an object of the present invention to provide a device that can reliably support the spring force of a plunger spring, move a control rack with a small force, and further allow easy disassembly and assembly.

Structure of the device: A fastener sheet having an annular spring receiving piece and a cylindrical piece is provided in the hole of the pump housing, a notch and a locking recess are formed in the cylindrical piece, and a locking member that locks in the locking recess is formed in the cylindrical piece. A stop piece prevents rotation, a control rack faces the notch, and the spring is supported by a spring receiving piece.

Embodiment FIG. 2 is a longitudinal sectional view of the fuel injection pump of the present invention, in which a top seat 20 is provided at the control rack 13 in the hole 2 of the pump housing 1.

As shown in FIGS. 3 to 6, the Atsupa sheet 0 includes an annular spring receiving piece 21 and a cylindrical piece 22, and the cylindrical piece 22 has a hole 23 and a notch 24 that serve as a locking recess. They are formed facing each other in the direction.

Specifically, the lower portion 10a of the control sleeve 10 is loosely fitted between the inner circumferential surface 21a of the spring receiving piece 21 and the lower small diameter portion 3a of the plunger barrel 3, and the threaded portion 10b of the control sleeve 10 is inserted into the cylindrical piece 22. The control rack 13 faces the inner circumferential surface 22a of the pump housing 1, and the control rack 13 faces the notch 24, and a bolt 26 serving as a locking piece is screwed into the hole 23 through the threaded hole 25 of the pump housing 1. In addition, the upper end surface of the cylindrical piece 22 is brought into contact with the plunger barrel 3, and the spring 19 is brought into contact with the lower surface of the spring receiving piece 21, so that the Atsupah sheet 20 does not come out upward. It is supported as such.

Therefore, by screwing and loosening the bolts 26 from the outside, the Atsupa sheet 20 can be installed and removed within the hole 2, making installation and removal easy.
Moreover, plunger 7 and plunger barrel 3 are connected to hole 2.
When installing and removing the plunger 7 and the plunger barrel 3 inside the hole 2, the attachment sheet 20 can be installed in advance in the hole 2 and the bolt 26 can be engaged in the hole 23 to temporarily support the plunger 7 and the plunger barrel 3 inside the hole 2. Since the spring 29 can be held by the attachment sheet 20 when being removed, disassembly and assembly of the spring 29 can be facilitated.

In addition, the Atsupashiet 20 is attached to the hole 23 with the bolt 24.
Since it is prevented from rotating, it will not rotate due to vibration or the like and interfere with the control rack 13.

In addition, since the spring 19 is supported by the annular spring receiving piece 21, the support is reliable and strong, and the spring force of the plunger spring 19 can be reliably supported. Since no force acts on the control sleeve 10, the control rack 13 can be moved with a small force.

Furthermore, the control sleeve 10 can be attached and detached from the control rack by temporarily pressing the top seat 20 before inserting the plunger barrel 3 during disassembly and assembly.

Effects of the invention Since the annular spring receiving piece 21 of the Atsupa sheet 20 can support the spring force of the plunger spring 19, the spring force of the plunger spring 19 can be supported reliably, and the spring force acts on the control sleeve 10. The control rack 13 can be moved with a small force without having to move.

In addition, by locking the locking piece in the locking recess from the outside and releasing it, the Atspa sheet 20 can be installed and removed in the hole 2, making the installation and removal easy. When installing and removing the plunger 7 and plunger barrel 3 in the hole 2, the attachment piece 20 can be installed in the hole 2 in advance and the locking piece can be engaged in the locking recess to temporarily support the plunger 7 and the plunger barrel 3 in the hole 2. Since the spring 29 can be held by the Atspa sheet 20 when being attached to or removed from the spring, disassembly and assembly of the spring 29 can be easily performed.

Further, since the fastening sheet 20 is prevented from rotating by the locking piece and the locking recess, it does not rotate due to vibrations and interfere with the control rack 13.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional fuel injection pump, Figure 2 is a sectional view of a conventional fuel injection pump.
The figure is a sectional view of a fuel injection pump showing an embodiment of the present invention, FIG. 3 is a plan view of the atsupah seat, FIGS. 4 and 5 are a left side view and right side view, and FIG. 6 is a sectional view. 1 is a pump housing, 2 is a hole, 3 is a plunger barrel, 5 is a cam, 6 is a tappet, 7 is a plunger, 10 is a control sleeve, 13 is a control rack, 17 is a spring receiver, 19 is a spring for the plunger, 20 is a Atsupa sheet, 21 is a spring receiving piece, 22 is a cylindrical piece, 23 is a locking recess, 24 is a notch, and 26 is a locking piece.

Claims (1)

[Scope of utility model registration request] The plunger 7 is fitted into the plunger barrel 3 provided in the hole 2 of the pump housing 1, and the plunger 7 is pressed against the cam 5 by the spring 19 via the tappet 6, so that the cam 5 and the tappet 6 engage the plunger 7.
At the same time, the control sleeve 10 connected to the plunger 7 is moved to the control rack 1.
3, the pump housing 1 has an annular spring receiving piece 21 and a cylindrical piece 22 in the hole 2, and the cylindrical piece 22 has a locking recess and a notch. 24 is provided, the spring 19 is brought into contact with this spring receiving piece 21, the cylindrical piece 22 is pressed against the plunger barrel 3, and the control rack 13 is exposed to the notch 24, and the pump housing 1
A fuel injection pump characterized in that the upper seat 20 is prevented from rotating by locking a locking piece removably provided in the locking recess.