MXPA01004477A - Engine with integrated unit pump injector and method of making the same - Google Patents

Abstract

Here is disclosed an integrated unit pump injector that includes a cam follower, unit pump, injection line and injection nozzle is pre-assembled for installation in an engine block and cylinder head. By pre-assembling the integrated unit pump injector, the assembly can be tested for fuel leaks, injection timing and volume of fuel delivered by the pump without first installing the individual devices in an engine. Variation in fuel output, injection timing and fuel volume is reduced while engine assembly time and cost is also reduced. The integrated unit pump injector orients the pump and nozzle on parallel axes and requires that the pump bore in the block and the nozzle bore in the cylinder head also be parallel to enable the injector and pump to be fixed relative to one another prior to installation and both installed simultaneously by movement in the direction parallel to their axes.

Description

ENGINE WITH INTEGRATED INJECTOR PUMP UNIT AND METHOD TO MAKE THE SAME BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection engine having injection pump and nozzle units that are integrated with one another as a subset that allows the integrated pump unit and the injection nozzles to be calibrated and to detect leaks before the installation of the integrated pump and the nozzle in the motor block and in the cylinder head. 2. Description of the related art Currently, camshaft drives, pump units, injection lines and injection nozzles are installed in motors as individual components. Part variability results in a significant variation in fuel output. The injection time is set by the measurement of the block and the selection of shims to adjust the assembly of the pump. Fuel leaks will occur if the injection line connections are defective or not properly tightened.

Only after assembly on an engine are these components coupled with the other, thus allowing calibration and leak detection of the quantity of fuel 5 supplied by the pump and the nozzle. If there are leaks present, or if the fuel outlet is not within the desired specification, the disassembly of the engine is significantly needed to access the pump or nozzle for correction.

Synthesis of the invention The present invention overcomes the above disadvantages by mounting the cam drive gear, the pump unit, the injection line and the injection nozzle together as an integrated pump unit injector prior to the installation of any of these components in the engine block and the cylinder head. The integrated assembly can be internally shod to give you the correct injection time and detect leaks and fuel leakage. Any set with twenty . leakage or fuel leakage outside the specific range may be disassembled and corrected. The integrated pump unit injector is then installed in the motor by simultaneously inserting both the injection nozzle and the pump unit into the cylinder head in the cylinder head and the block respectively. The simultaneous installation of the injection nozzle and the pump as an integrated unit requires that the -ii - l ------------ E-i hole of the injection nozzle on the cylinder head and the pump hole on the block are parallel to each other. This is not the case with many engine designs.

By having a preassembled integrated pump unit injector, the total assembly can be installed on the motor without alteration or subsequent adjustment. This reduces the time and cost of mounting the motor, reduces the variability of the motor output and reduces the possibility of leakage. An additional advantage is a short feedback time from the manufacturer of the pumps and injection nozzles for any manufacturing defects. This is possible by having the pump and nozzle manufacturer test the integrated assembly before shipment to an engine manufacturer instead of waiting until the components are mounted on an engine, the entire engine is tested and the defects in the pumps or in the nozzles they are reported to the manufacturer of the nozzle and of the pump.

A pump unit is associated with each cylinder of a motor.

Description of the drawings Figure 1 is a side elevational view of the injector of the integrated pump unit of the present invention.

Figure 2 is an enlarged perspective view of the engine block, the cylinder head and the injector of the integrated pump unit.

Description of the Preferred Incorporation The injector of the integrated pump unit of the present invention is shown in Fig. 1 and designated generally with the number 10. The injector of the integrated pump unit includes a pump unit 12, a cam drive gear 14, a line of injection 16 and an injection nozzle 18. The axis of the nozzle and the pump shaft are parallel to one another to allow the injector of the integrated pump unit to be installed in an engine as described below.

The pump unit 12 is a conventional pump and includes a fuel inlet port 20. The internal piston of the pump is attached to a radial control arm 22 which has a bolt 24 which is fastened to a control rod. The control rod is moved by the motor regulator to rotate the pump plunger to vary the amount of fuel supply per stroke of the pump plunger. The cam driving gear 14 includes a roller 30 which engages a lobe 32 in the camshaft 34 shown in Fig. 2. The camshaft lobe makes an upward stroke of the pump plunger.

The outlet of the pump is coupled to the injection line 16 through a threaded coupling 36. The opposite end of the injection line 16 is integrally connected to the body 38 of the injection nozzle 18. Alternatively, the injection line can be the nozzle is connected through another threaded coupling. The nozzle 18 ends in a tip 40 that supplies fuel to the combustion chamber.

The integrated pump unit injector 10 is assembled together as shown in figure 1 as a sub-assembly before installing the components in the engine block or cylinder head. Once assembled, the injector of the integrated pump unit is tested for leakage and the fuel volume output and is internally bolted to give you the correct injection time. Any of the sets with leaks or with fuel outlets outside the specified range are dismantled and corrected. The injector of the integrated pump unit 10 is subsequently installed in a motor after the cylinder head 50 is fastened to the motor block 52 by a plurality of bolts 54 in a conventional manner. The cylinder head 50 is provided with a nozzle orifice 56 that receives the nozzle 18 of the integrated pump unit injector. Similarly, the block 52 includes a pump orifice 58 that receives the pump 12. The pump orifice 58 and the nozzle orifice 56 are parallel to one another.

The injector of the pump unit 10 is installed in the motor by simultaneously placing the pump 12 in the hole of the pump 58 and the injection nozzle 18 in the hole of the nozzle 56. The pump passes through an opening 60 in the cylinder head and in the hole of the pump 58 of the block.

A downward retaining member of a fork-shaped nozzle 62 secures the nozzle to the cylinder head. A bolt 64 is inserted in the threaded opening 65 in the cylinder head. A bolt 64 is inserted in the threaded opening 65 in the cylinder head. In the same way, a fork-down pump retention member 66 is retained by a threaded fastener 68 in the opening 70 in the block to secure the pump to the block. The downstream pump retainer member 66 engages the upper horizontal surface 74 of the pump 12.

Prior to the installation of the injector of the pump unit, the camshaft 34 is installed in the engine block through the opening 76 at the end of the block. The camshaft is placed below the pump to be engaged by cam 14. The camshaft has a lobe for the pump unit of each cylinder.

The use of the injector of the integrated pump unit of the present invention is made possible by the orientation of the orifice of the nozzle 56 and the hole of the pump 58 parallel to one another so that the pump and the nozzle attached can be inserted simultaneously , as a set, in the cylinder head and the block. The injector of the integrated pump unit and the manufacturing method make it possible to reduce the time of assembly of the motor and the cost. In addition, the injector of the integrated pump unit reduces the output variability and the probability of leakage.

The invention should not be limited to the embodiment described above, but should be limited only by the claims that follow.

Claims (9)

1. A method of manufacturing a fuel injection engine comprising the steps of: fastening a cylinder head to a block, the cylinder head has a nozzle orifice for receiving a fuel injection nozzle and the block has a pump orifice for receiving a pump unit, the nozzle orifice and the orifice the pump are parallel to one another when the cylinder head is attached to the block; and install a pre-assembled integrated pump unit injector that has an injection nozzle, a pump unit and an injection line that connects the injection nozzle to the pump unit, the injection nozzle and the pump unit each have a axis with the axes being oriented parallel to each other, the integrated pump unit injector is installed in the block and the cylinder head by simultaneously inserting the nozzle and pump into the holes of the nozzle and the pump respectively.

2. The method, as claimed in clause 1, characterized in that the injector of the integrated pump unit includes a cam drive gear attached to the pump unit for engaging a camshaft carried by the block.

3. The method as claimed in clause 1, characterized in that it comprises the steps of: securing the nozzle to the cylinder head with a first retention member downward; Y Secure the pump to the block with a second retention member facing down.

4. The method, as claimed in clause 3, characterized in that the first and second retention members downwards are fastened by means of fasteners in holes in the cylinder head and the block parallel to the orifices of the pump and the nozzle.

5. A method of manufacturing a fuel injection engine comprising the steps of: mounting an integrated pump unit injector by coupling a pump unit to an injection nozzle by means of an injection line with a longitudinal axis of the nozzle parallel with a longitudinal axis of the pump; attaching a cylinder head to a block, the cylinder head has a nozzle orifice for receiving a fuel injection nozzle and the block has a pump orifice for receiving a pump unit, the nozzle orifice and the orifice of the pump being parallel to one another when the cylinder head is attached to the block; Y install the pre-assembled integrated pump unit injector by simultaneously inserting the nozzle and pump into the nozzle and pump bores in the cylinder head and block respectively.

6. The method, as claimed in clause 5, characterized in that it also comprises the step of testing the injector assembly of the integrated pump unit for leaks before the installation of the injector of the integrated pump unit in the cylinder head of a block.

7. The method, as claimed in clause 5, characterized in that it further comprises the step of calibrating the injector of the integrated pump unit assembled for the desired fuel volume at a given speed and the position of the control arm before the installation of the injector of the integrated pump unit in the cylinder head and the block.

8. The method, as claimed in clause 5, characterized in that the injector of the integrated unit of the pump includes a cam drive gear and further comprises the step of installing a camshaft in the block before the installation of the injector of the integrated pump unit.

9. The method, as claimed in clause 5, characterized in that it also comprises the steps of: securing the nozzle to the cylinder head with a first retention member downward; Y Secure the pump to the block with a second retention member facing down.