JPH0124371Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to an improvement of a fuel pump drive device for an engine.

(Problems to be solved by conventional techniques and ideas) Generally, in an engine, as shown in Fig. 1,
A camshaft 2 having an eccentric cam 3 is rotatably supported in the axial direction from the side of the cylinder head 1 in a shaft hole 2a provided in the cylinder head 1,
A push rod 5 is slidably inserted into a hole 4 bored in the cylinder head 1 in a direction perpendicular to the axis of the camshaft 2.
One end of the push rod 5 is brought into contact with the eccentric cam 3 of the camshaft 2, and the other end of the push rod 5 is brought into contact with the drive lever 7 of the fuel pump 6 attached to the cylinder head 1. Some fuel pumps drive the fuel pump 6 by reciprocating the push rod 5 via the core cam 3 and pushing the drive lever 7 of the fuel pump 6.

However, in this type of device, the diameter of the eccentric cam 3 is usually smaller than the diameter of the camshaft 2, so the push rod 5 protrudes into the shaft hole 2a of the cylinder head 1. Therefore, when pulling out or inserting the camshaft 2 in the axial direction from the shaft hole 2a of the cylinder head 1 during repairs, etc., it is necessary to first remove the push rod 5 from the hole 4 so that the camshaft 2 does not hit the push rod 5. be.

However, if the push rod 5 is left in the hole 4 due to incorrect operation or forgetfulness during this repair, etc., problems may arise such as the push rod 5 being bent when removing or inserting the camshaft 2 from the shaft hole 2a. be.

In view of this point, the present invention aims to provide an engine drive device in which the push rod etc. are not bent during repair.

[Structure of the invention]

(Means for Solving the Problems) The present invention has a camshaft attached to the cylinder head from the side so that it can be inserted and removed in the axial direction, and the eccentric cam of this camshaft pushes the push rod to operate the fuel pump drive lever. In the fuel pump drive device for an engine, a connecting piece is hooked to a horizontal groove provided at the tip of a push rod, the tip of the connecting piece is connected to a drive lever, and the push rod is driven through the connecting piece to drive the fuel pump. It is connected to a lever.

(Operation) When disassembling or repairing an engine, first remove the fuel pump from the cylinder head, and since the push rod is connected to the drive lever, the push rod will also come out at the same time. Therefore, when the camshaft is inserted into and removed from the cylinder head, the push rod does not get in the way and the push rod is not bent.

(Embodiment) The embodiment of the fuel pump drive device for the engine of the present invention shown in FIGS. 2 and 3 will be described below. In the same description, the same parts as in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the shaft hole 2a provided in the cylinder head 1,
A camshaft 2 having an eccentric cam 3 is inserted in the axial direction from the side of the cylinder head 1 and rotatably supported, and is inserted into a hole 4 bored in the cylinder head 1 in a direction orthogonal to the axis of the camshaft 2. The push rod 5 is slidably inserted, one end of the push rod 5 is brought into contact with the eccentric cam 3 of the camshaft 2, and the push rod 5
The other end is brought into contact with the drive lever 7 of the fuel pump 6 attached to the cylinder head 1, and the rotation of the camshaft 2 causes the push rod 5 to reciprocate via the eccentric cam 3, and the drive lever of the fuel pump 6 is moved. 7 to drive the fuel pump 6. This structure and operation are similar to conventional ones.

In such a device, a horizontal groove 8 is provided at the tip of the push rod 5, and locking holes 10 are formed in both side walls of the drive lever 7. This horizontal groove 8
A spring portion of a connecting piece 9 processed using spring steel wire is hooked to the holder, and the end of the connecting piece 9 is inserted into the locking hole 10, so that the push rod 5 and the drive lever 7 are connected by the connecting piece 9. connected.

Therefore, when removing the camshaft 2 from the cylinder head 1 and disassembling it for repair, first remove the fuel pump 6.
Remove from cylinder head 1. When the fuel pump 6 is removed, the push rod 5 is connected to the drive lever 7 by the connecting piece 9, so the push rod 5 is also removed at the same time, and there is no chance of forgetting to remove the push rod 5 and bending it. Furthermore, the push rod 5, which is a small part, is also prevented from being destroyed. During driving, the connecting piece 9 prevents the push rod 5 from rotating, reducing wear, and since the push rod 5 and the drive lever 7 are in close contact with each other, no hitting noise is generated.

Furthermore, when inserting the camshaft 2 into the cylinder head 1, the camshaft 2 is attached to the cylinder head 1, the fuel pump 6 is placed close to the cylinder head 1, and the push rod 5 is inserted into the cylinder head 1.
is inserted into the bore 4, and then the fuel pump 6 is attached to the cylinder head 1. Therefore, the camshaft 2 does not bend the push rod 5 even during insertion.

[Effect of idea]

As explained above, this invention uses an eccentric cam of the camshaft to push the push rod to drive the fuel pump via the drive lever, and the push rod and the drive lever are connected by a connecting piece. When the camshaft is removed from the cylinder head for disassembly and repair, the push rod will not be left in the shaft hole of the cylinder head. Therefore, during this disassembly and repair, the push rod is not bent by the camshaft.

Further, since the push rod is supported by the connecting piece during engine operation, the push rod does not rotate within the hole and does not wear out.

Furthermore, since the push rod and the drive lever are connected, the push rod and the drive lever will not collide with each other and generate a hitting sound.

Furthermore, the small push rods will not be crushed.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional example, FIGS. 2 and 3 show an embodiment of the present invention, FIG. 2 is a longitudinal sectional view, and FIG. 3 is an exploded perspective view of essential parts. 2...Camshaft, 3...Eccentric cam, 5...
Push rod, 6...Fuel pump, 7...Drive lever, 8...Horizontal groove, 9...Connection piece.

Claims (1)

[Scope of utility model registration request] In an engine fuel pump drive device, a camshaft is attached to the cylinder head so that it can be inserted into and removed from the side of the cylinder head in the axial direction, and the eccentric cam of the camshaft pushes the push rod to operate the fuel pump drive lever. A fuel pump for an engine, characterized in that a connecting piece is hooked to a horizontal groove provided at the tip of the push rod, the tip of the connecting piece is connected to a drive lever, and the push rod is connected to the drive lever of the fuel pump via the connecting piece. Drive device.