MXPA97000261A - Fuel injector and assembly for motor brake valve placement, for an internal decombustion engine with combustibledire injection - Google Patents

Abstract

The present invention relates to installation assembly, for mounting a fuel injector and a motor brake valve structure in a cylinder head of an internal combustion engine with direct fuel injection, the cylinder head has a cavity of assembly that receives the fuel injector and a mount hole that receives the engine brake valve structure, a clamping arm that has opposite ends, one disposed in the fuel injector and the other in the brake valve structure of motor, and a clamping bolt that extends through the clamping arm between the fuel injector and the engine brake valve structure and that is threaded into the cylinder head to fix the fuel injector and the valve structure of the engine. Motor brake in position, inside the respective mounting cavity and the mounting hole

Description

FUEL INJECTOR AND ASSEMBLY FOR PLACEMENT OF V MOTOR BRAKE LUBE, FOR AN INTERNAL COMBUSTION ENGINE CQN DIRECT FUEL PS INJECTION BACKGROUND OF THE INVENTION The invention relates to an internal combustion engine with direct fuel injection, which has a fuel injector arranged in a receiving cavity. formed in the head of the cylinder, where the injector is seated by a retention clamp down, mounted on the cylinder head. DE 43 15 233 Al discloses this internal combustion engine with direct fuel injection, where an injector is arranged in a receiving cavity and is maintained in position by clamping mounts. It is the object of the present invention to provide an internal combustion engine, wherein not only a fuel injector, but also an engine brake valve are disposed at the head of the cylinder and both are held firmly in position. SUMMARY OF THE INVENTION In a mounting assembly for a fuel injector and a motor brake valve structure in the cylinder head of an internal combustion engine, wherein the cylinder head has a mounting cavity which receives the injector of fuel and a mounting hole that receives the motor brake valve structure, a clamping arm is disposed with its opposite ends in the fuel injector and the motor brake valve structure and a clamping bolt extends to through the central portion of the clamping arm and threaded into the cylinder head to fix the fuel injector and the motor brake valve structure in its mounting and mounting bore. With the arrangement according to the invention, the weight and expense are reduced since only a single component is used to fix the two devices and the assembly procedure is also simplified. Various features and advantages of the invention will be apparent from the following description of the invention based on the accompanying drawings. DESCRIPTION OF A PREFERRED IPAP MQPA The cylinder head l of an internal combustion engine with direct fuel injection includes a fuel injector 12 and also a brake valve 3 engine. By means of the fuel injector 2, the fuel is injected directly to the combustion chamber (not specifically shown) of the internal combustion engine. Motor brake valves are well known in the art. They are used to increase the braking effect of the engine during slow running of the engine, that is, when the engine is driven by the wheels of the vehicle. For this purpose, an engine brake valve is opened at the end of the compression stroke of a piston in such a way that the compressed gas is discharged, by throttling, from the cylinder before the start of the engine discharge stroke, with that the energy contained in the compressed boxes is destroyed and energy is consumed during the downward movement of the piston for the expansion of the gas remaining in the combustion chamber. The operating principles of the injector and the engine brake valve are well known in the art and therefore are not described in detail. To receive the fuel injector 2, the cylinder head 1 includes a mounting cavity 4 with a seat 5, to support the fuel injector 2. To assemble, the fuel injector 2 is inserted into the mounting cavity 4a until it rests on the seat 5. The particular design of the injector 2 is not the subject of the present invention and the injector is therefore not described in detail. Since high pressures are generated in the combustion chamber during operation of the internal combustion chamber, the mounting cavity 4 must be sealed with respect to the environment. For this purpose, a seal ring 6 for example on the outer circumference of the fuel injector 2 can be provided. In order to prevent the fuel injector 2 from detaching from the seat 5., the fuel injector 2 must be fixed in its seated position. To achieve this, a clamping arm 7 is mounted on the cylinder head 1 by a clamping bolt 8 and the fuel injector 2 has at its remote end of the combustion chamber, a recess 9 receiving centering pin 10 which is projected from the clamping arm 7, To mount the clamping arm 7, the clamping bolt 8 is inserted through a bore II in the clamping arm 7 and threaded into the threaded bore that is formed in the head of the cylinder I. Adjacent to the mounting cavity 4 for the fuel injector 2, the cylinder head l includes a mounting hole 12 with a seat 13 for receiving the motor brake valve 3. In the mounting hole 12, there is a piston 14 which is movably disposed adjacent to the arrow 15 of the remote motor brake valve 3 of the combustion chamber. At its remote upper end of the combustion chamber, the valve arrow 15 has a shoulder member 23 which is engaged by a valve spring 22 which is held in the seat 13 to thereby hold the engine brake valve in place. a closed position. The piston 14 delineates on its remote side of the combustion chamber a control space 16 to which oil or air under pressure can be admitted by a passage 17. Towards the upper side of the cylinder head 1 the control space 16 is sealed by a pressure member 18 having a neck 19 and a seal ring 20, which extends around the neck 19. When the pressure member 18 is installed, the neck 19 extends to the mounting hole 12, so that the seal ring 20 engages the inner surface of the mounting bore 12. Towards the combustion chamber, the control space is sealed by a seal ring 21, which is disposed on the outer circumference of the piston 14. By the admission of oil or air under pressure to the control space 16, the piston 14 moves down to open the engine brake valve. When the pressure in the control space 16 is reduced, the motor brake valve is returned by the valve spring 22 to its closed position. According to the present invention, the clamping arm 7 is mounted on the head of the cylinder in such a manner that it engages with its opposite ends the fuel injector 2 as well as the pressure member 18 of the motor brake valve 3. to facilitate this, the clamping arm seal 7 has a curvature 24 in its central section, bending away from the cylinder head 1. In addition, both ends of the clamping arm 7 have centering pins 10, 25 extending in respective recesses 9, 26 formed in the fuel injector 2 and the pressing member 18. The bore 11 for the clamping bolt 8 and the respective threaded bore in the cylinder head 1, are provided in the bending area 24 of the clamping arm 7, so that when mounted, the clamping arm 7 does not buttress the cylinder head 1 in the area of curvature 24, but is held exclusively by the centering pins 10, 25 in the injector 2 and the pressure member 18. When tightening the clamping bolt 8, both the fuel injector 2 and the engine brake valve 3 can be fixed in their installed position at the same time. Instead of providing a motor brake valve 3 as illustrated in the Figure, it is of course possible to preassemble the components of the engine brake valve to form a unit and then install the assembled motor brake valve unit. 3 in the guide bore 12. In this case, the clamping arm 7 engages the upper front end of the motor brake valve unit. By a particular design of the centering pins 10, 25 and the fuel injector and the engine brake valve unit, the rotation of the fuel injector 2 and the engine brake valve unit 3 can be avoided. case, the centering pins 10, 25 and the respective recesses 9, 26 are not circular but have corresponding shapes, such that the pins positively lock with the fuel injector and the engine brake valve unit, when coupled in the respective recesses. Both the centering pins 10 and the recess 9 for example may have the shape of a pyramid.

With the arrangement according to the invention, weight as well as expense can be saved since only one component is required to fix the fuel injector and the engine brake valve. In addition, the assembly is simplified since only one assembly step is required to install the fuel injector and the engine brake valve unit.

Claims (5)

1. RBXVIHpIGACpHBS 1.- Mounting mounting, to assemble a fuel injector and a motor brake valve structure on a cylinder head of an internal combustion engine with direct fuel injection, the cylinder head has a mounting cavity that receives the fuel injector and a mount hole that receives the engine brake valve structure, a clamping arm having opposite ends, one disposed in the fuel injector and the other in the engine brake valve structure, and a clamping bolt that extends through the clamping arm between the fuel injector and the engine brake valve structure and that is threaded into the cylinder head to secure the fuel injector and the brake valve structure of motor in position, within the respective mounting cavity and the mounting hole.
2. 2. Installation assembly as described in claim 1, characterized in that the clamping arm is configured in such a way that in its installed position, it is not in contact with the cylinder head but only at its opposite ends with the injector of fuel and the motor brake structure respectively, and wherein a bore extends through the clamping arm in a centering area between the opposite ends with a clamping bolt extending through the bore to force the arm of clamping on the fuel injector and the engine brake valve structure.
3. 3. Installation assembly as described in claim 1, characterized in that the clamping arm has centering pins projecting from their opposite ends and the fuel injector and the engine brake valve structure have recesses receiving the respective centering pins.
4. 4. Positioning assembly as described in claim 1, characterized in that the motor brake valve structure includes a valve with a valve arrow extending into the mounting cavity for the motor brake valve structure. , a valve spring disposed about the valve shaft and resting on one end while the other end is in engagement with the valve shaft to hold the engine brake valve in a closed portion, a piston disposed movably in the cavity and which is on one side in contact with the valve arrow and which defines on its opposite side a control space, a pressure member disposed at the end of the mounting cavity opposite the piston to close the control space and passage means, to supply a fluid under pressure to the control space to move the piston and open the valve against the force of the valve spring, the clamping arm n holds down the pressure member to seal the control space.
5. 5. Mounting assembly as described in claim 4, characterized in that the pressure member includes a shoulder member that extends into the bore and a seal ring that extends around the shoulder member to seal the shoulder member. pressure in the perforation.