JPH032699Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for attaching a fuel injection pump to the engine body of an internal combustion engine such as a diesel engine or a fuel-injected gasoline engine.

When this type of fuel injection pump is installed on a bracket protruding from the main body of the engine, for example, as described in Japanese Utility Model Application Publication No. 57-26623,
The fuel injection pump is mounted by drilling a bolt hole in the shape of an arc long groove centered on the pump axis of the fuel injection pump in the bracket, and fastening it to the bracket with a bolt inserted through the bolt hole in the shape of an arc long groove.

In this case, the reason why the bolt hole into which the mounting bolt is fitted is an arc-shaped long groove hole centered on the pump axis of the fuel injection pump is because the installation phase position in the rotational direction of the fuel injection pump with respect to the bracket is This is because the fuel injection timing with respect to the engine crank angle can be adjusted by changing the mounting phase position in the rotational direction.

However, although the weight of the fuel injection pump is quite heavy, the conventional installation is a fixed installation using bolts as described above, and engine vibrations are directly transmitted to the fuel injection pump.
Due to the vibration of the heavy fuel injection pump, a considerably large bending moment acts on the bracket to which the fuel injection pump is attached in the vertical direction and in the axial direction of the fuel injection pump. For this reason, the bracket must be constructed to be strong enough to withstand large bending moments in both directions, which increases the overall weight of the engine, especially if the bracket protrudes from the cylinder head of the engine. Of the bending moments in both directions for the bracket, the bending moment in the vertical direction repeatedly acts as a compressive load on the sealing gasket inserted between the cylinder head and the cylinder block. The elasticity was reduced and gas, water and oil leaks were likely to occur.

The present invention reduces the weight of the bracket by inserting anti-vibration rubber between the fuel injection pump and the bracket when the fuel injection pump is attached to the cylinder head or cylinder block of the engine via the bracket. This is what we aim to do. However, inserting the vibration isolating rubber between the fuel injection pump and the bracket in this way means that the mounting phase position of the fuel injection pump in the rotational direction relative to the bracket may be affected by vibration due to the deformation of the vibration isolating rubber. If the vibration damping rubber changes, the timing of fuel injection by the fuel injection pump will fluctuate, making the engine operating condition unstable. This prevents the vibration-proofing effect, thereby avoiding fluctuations in fuel injection timing caused by the use of vibration-proofing rubber.

The present invention will be described below with reference to an embodiment. In the figure, 1 is an internal combustion engine having a cylinder head 3 fastened to the upper surface of a cylinder block 2, and 4 is driven from a camshaft 5 in the internal combustion engine 1 via a timing belt 6. The fuel injection pumps 4 are arranged between a pair of brackets 7 and 8 whose base ends are fixed to the cylinder head 3 of the engine 1, and the pump shaft of the fuel injection pump 4 is shown as follows. 4a is removably fixed to the other bracket 8 by fastening a bolt 9 inserted through the other bracket 8 parallel to the pump shaft 4a, and the bolt 9 passes through the bracket 8. A ring-shaped vibration isolating rubber 10 is inserted therein, while a portion of the fuel injection pump 4 on the side of the pump shaft 4a has arm portions 11a, 11a extending in the left-right direction from the axis of the pump shaft 4a. The mount member 11 is attached by fastening both arms 11a, 11a to the fuel injection pump 4 with bolts 12, and mounting pieces are provided on both upper and lower surfaces of the mount member 11 via vibration-proof rubbers 13, 13. 14,1
4, and both mounting pieces 14 are fastened to one of the brackets 7 with bolts 15, respectively.

Each of the mounting pieces 14, 14 is provided with a protrusion piece 17 that protrudes along a substantially vertical line 16 passing through the axis of the pump shaft 4a. By providing a groove 18 in which the projection piece 17 is slidably fitted in the direction of the line 16, rotation of the fuel injection pump with respect to the bracket is prevented.

The bolt hole 19 of the bolt 12 for attaching the mount member 11 to the fuel injection pump 4 is formed into an arc-shaped long groove hole centered on the axis of the pump shaft 4a, so that the fuel injection to the brackets 7 and 8 is prevented. The mounting phase position of the pump 4 in the rotational direction is configured to be changeable.

In this configuration, the anti-vibration rubber 1 is inserted into the attachment portion of the fuel injection pump 4 to both the brackets 7 and 8.
0 and 13, the vertical projection piece 17 on one bracket 7 side fits into the groove 18 of the mount member 11 attached to the fuel injection pump 4 side.
A vibration isolating effect is performed in the vertical direction of the fuel injection pump 4 and in the direction of the pump shaft 4a, in other words, vibration components of the engine vibration in the vertical direction and the direction of the pump shaft 4a are prevented from being transmitted to the fuel injection pump 4. Since the vibration is absorbed and alleviated by both the vibration isolating rubbers 10 and 13, the vibration of the heavy fuel injection pump 4 causes the vibration of both the brackets 7 and 8.
The bending moments acting in the vertical direction and in the direction of the pump shaft 4a are significantly reduced.

On the other hand, by fitting the vertically protruding piece 17 on the bracket 7 side into the groove 18 of the mount member 11 attached to the fuel injection pump 4 side so as to be slidable in the vertical direction, the fuel injection pump 4 can be mounted on its pump shaft. Since it is held so that it does not rotate around 4a, there is no variation in the fuel injection timing in the fuel injection pump 4 due to the presence of the vibration isolating rubbers 10 and 13.

In the above embodiment, the vertical protrusion 17 on the bracket 7 side is attached to the mount member 11 attached to the fuel injection pump 4 side as a means for engaging the fuel injection pump so as to prevent only the rotational movement of the fuel injection pump with respect to the bracket. Although the case is shown in which the projecting piece 17 and the groove 18 are fitted in the groove 18 of the fuel injection pump 4 so as to be slidable in the vertical direction, the present invention is not limited to this. or set it up in
It goes without saying that other means may be used to prevent only the rotation of the fuel injection pump relative to the bracket.

As described above, in the present invention, when a fuel injection pump is disposed between two brackets protruding from the main body of an internal combustion engine and attached to the two brackets, the mounting portion between the fuel injection pump and both brackets is fixed. A vibration isolating rubber of the fuel injection pump is inserted, and means is provided between at least one of the brackets and the fuel injection pump so as to prevent only rotational movement of the fuel injection pump with respect to the bracket. As a result, the bending moment in the vertical direction and pump axial direction relative to both brackets can be reduced by the anti-vibration rubber.
Both brackets can be made smaller and lighter, and when both brackets are attached to the cylinder head of an engine, the durability of the sealing gasket inserted between the cylinder head and cylinder block is not reduced. Furthermore, fluctuations during fuel injection due to the use of anti-vibration rubber for the fuel injection pump can be reliably prevented and have the effect of not interfering with the stability of engine operation.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of the engine, FIG. 2 is a plan view of the engine, FIG. 3 is an enlarged cross-sectional view of FIG. 2, and FIG. 4 is a cross-sectional view of FIG. 2. −
FIG. 5 is an enlarged sectional view taken along the line V-V in FIG. 4. 1...Internal combustion engine, 2...Cylinder block, 3
...Cylinder head, 4...Fuel injection pump, 4
a... Pump shaft, 7, 8... Bracket, 9, 1
2, 15...Bolt, 11...Mount member, 1
4... Mounting piece, 10, 13... Anti-vibration rubber, 17...
...projection piece, 18...groove.

Claims (1)

[Scope of utility model registration request] When a fuel injection pump is disposed between two brackets protruding from the main body of an internal combustion engine and attached to the two brackets, a preventive part of the fuel injection pump is provided at the mounting portion between the fuel injection pump and both brackets. Fuel injection in an internal combustion engine, wherein a swinging rubber is inserted, and means is provided for engaging at least one of the two brackets and the fuel injection pump so as to prevent only rotational movement of the fuel injection pump with respect to the bracket. Pump mounting device.