JPH03513Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a lubricating oil overflow level setting structure in a fuel injection device suitable for, for example, a fuel injection device equipped with an electronic governor. (Prior art) Among the fuel injection devices installed in diesel engines, for example, in the cam chamber and governor chamber of the in-line fuel injection pump, there is a fixed amount of fuel injected into the cam chamber and governor chamber to prevent seizure and wear of each sliding and rotating part. of lubricating oil, the amount of which is determined by the overflow level. For example, in a row-type injection pump equipped with a mechanical governor mechanism, an oil outlet is provided at a fixed position in the governor case as shown in Japanese Utility Model Application Publication No. 51-56423, and the pump housing of the pump chamber communicates with the oil outlet through this outlet. The oil outlet is provided on the side of the cam chamber at a position lower than the oil outlet, and these oil outlets set the respective overflow levels of the governor chamber and cam chamber, and also set the oil level in the governor chamber to a higher level than that of the cam chamber. It is set to . Even if the injection pumps are of the same type, the setting of the overflow level differs depending on the function of the accompanying mechanism. For example, in an in-line injection pump equipped with an electronic governor, which is expected to have better control capabilities and whose range of use has expanded in recent years, this type of governor requires a small amount of oil to be applied to the link connecting the control rod and the linear DC motor. Since all that is needed is a large amount of lubricating oil, unlike when equipped with a mechanical governor as described above, a large amount of lubricating oil is not required. In a fuel injection pump equipped with such an electronic governor, a large amount of lubricating oil is required for the camshaft, cam, pet, etc. in the pump room side as before, but on the other hand, injecting lubricating oil is generally disliked in the governor room, and it is difficult to use the electronic governor. In order to improve startability at low temperatures, conventionally an oil seal was installed between the pump chamber and the governor chamber to prevent the lubricating oil in the pump chamber from penetrating into the governor chamber. In this case, the lubricating oil was discharged from an oil drain provided in the governor room that was separate from the oil drain on the pump room side. (Problems to be solved by the invention) However, in this conventional method, an oil drain is required for each of the pump chamber and the governor chamber, and an oil seal is required between the two chambers. As a result of requiring piping, the structure became complicated and the assembly work became complicated. This invention solves these problems, simplifies the structure, simplifies assembly work, improves the accuracy and life of the governor, improves the oil-tightness of the lubricant, and prevents overflowing lubricant. An object of the present invention is to provide a structure for setting an overflow level of lubricating oil in a fuel injection device, which protects the governor by quickly discharging lubricating oil and preventing it from remaining in a governor chamber. (Means for solving the problem) Therefore, the lubricating oil overflow level setting structure in the fuel injection device of the present invention has a governor partitioned by a governor housing and a governor case on the side of the cam chamber of the fuel injection pump. In a structure for setting a lubricating oil overflow level in a fuel injection device, the actuator of the governor is disposed between the governor housing and the governor case. An actuator case that can be mounted and whose inner lower end surface can be engaged with the lower end surface of the governor housing is provided, and a partition wall that can dam the lubricating oil in the cam chamber is protruded inward at the bottom of the case. A locking step that can be engaged with the inner surface of the lower end of the governor housing is provided protrudingly at a substantially mid-high position on the inner surface of the partition wall, and at a base end of the outer surface of the partition wall below the locking step. Open the oil outlet downward at the
And the head from the outside of the partition wall to the oil outlet,
It is characterized by being larger than the height of the inner surface of the partition wall that can come into contact with lubricating oil. (Example) Hereinafter, an illustrated example in which the present invention is applied to a fuel injection device equipped with an electronic governor will be described.
In FIGS. 1 and 2, reference numeral 1 denotes an in-line fuel injection pump. A camshaft 4 is rotatably supported in a cam chamber 3 located below a pump chamber partitioned by a pump housing 2. A cam 5 formed at 4 pushes up a tappet 6, and a plunger 7 integrated with the tappet 6 is made capable of reciprocating up and down. An electronic governor 8 that adjusts the fuel injection amount based on a control signal output from a control unit (not shown) is provided on one side of the fuel injection pump 1 , and the electronic governor 8 includes a governor housing 9,
The actuator 13 is housed in a governor chamber 12 partitioned by an actuator case 10 having an actuator (to be described later) attached therein and a governor case 11. Among these, the actuator case 10, which is interposed between the governor housing 9 and the governor case 11 and fixed thereto with screws, receives a control signal from a control unit constituting the actuator 13 . Operating linear DC motor 14 and linear DC motor 1
A link 16 for transmitting the movement of the control rod 15 to the control rod 15, and a control rod position sensor 17 for detecting changes in the position of the control rod 15 are housed. In the diagram, 18 is linear DC motor 1
The coil assembly 4 is movable up and down, and 19 is a connector attached to the tip of the control rod 15 to transmit the movement of the link 16 to the control rod 15. A partition wall 20 is integrally formed at the bottom of the actuator case 10 and projects inwardly from the governor chamber 12, and the tip of the partition wall 20 is located slightly above the axis of the camshaft 4 in the embodiment. The lubricating oil flowing into the bottom of the governor housing 9 is dammed up to the above-mentioned height position, and the overflow level h is
is set. Reference numeral 20a denotes a hooking step that protrudes laterally from the base of the partition wall 20, and is attached to the governor housing 9.
21 is an oil outlet formed in the bottom of the actuator case 10, and a tubular connecting bolt 22 is attached to this outlet 21.
is connected. A substantially tubular eye bolt 23 is connected to the connecting bolt 22, and an oil pipe 25 communicating with the crank chamber of the engine is connected to the bolt cap 24. In addition, 26 in the figure is a timer that controls the fuel injection timing by a solenoid valve drive signal (not shown), 27 is a cable that accommodates the connection between the electronic governor 8 and the control unit, and 2
8 is a gasket inserted between the pump housing 2 and the governor housing 9; 29 and 29 are gaskets provided on both end surfaces of the actuator case 10; and 30 is a gasket retained in the cam chamber 3 and the bottom of the governor housing 9. It is a lubricant. (Function) When assembling the lubricating oil overflow level setting structure configured in this way, for example, the governor housing 9 is screwed to the side end surface of the pump housing 2, and the actuator 13 is attached to the side end surface of the fixed governor housing 9. After applying the actuator case 10 and positioning it by engaging the locking step 20a protruding from the lower part with the bottom surface of the governor housing 9, the actuator case 10 is attached to the governor housing 9 with screws. Stop and fix. In this manner, when assembling the actuator 13 , the actuator case 10 can be assembled after the actuator 13 etc. have been installed all at once. By being able to assemble it to the case 10 in advance, this type of assembly work can be done rationally. In this case, the oil-tight structure between the cam chamber 3 and the governor chamber 12 of the fuel injection pump 1 does not require a special oil-tight structure or sealing members such as oil seals, so there are fewer assembled parts. Therefore, this kind of assembly work can be performed easily and quickly. Moreover, since there is only one oil outlet 21 at the bottom of the governor chamber 12, the oil drain piping structure is simplified compared to the conventional oil outlet in which both the injection pump 1 and the governor chamber 12 are provided. This makes this type of piping work much easier. After installing the actuator case 10, the governor case 11 is fixed to the case 10 with screws, and a connecting bolt 22 is connected to the oil outlet 21 formed at the bottom of the actuator case 10. After attaching the bolt cap 24 to the bolt 22 via the eye bolt 23, the oil pipe 25 may be connected to the bolt cap 24. In the lubricating oil overflow level setting structure assembled in this way, the cam chamber 3 of the fuel injection pump 1 and the governor chamber 12 of the electronic governor 8 are mainly connected to the shaft support of the camshaft 4 between the pump housing 2 and the governor housing 9. A substantially communicating state is formed by the gap between the two. Further, a locking step 20a protruding from the bottom of the actuator case 10 and a gasket 29 are located at the lower end of the opening side of the governor housing 9, and maintain oil tightness between them. And at the same position there is a latching step 20.
A partition wall 20, which is integral with the governor housing 9, forms a peripheral wall and forms a kind of oil reservoir at the bottom of the governor housing 9. Therefore, when lubricating oil is supplied into the cam chamber 3, a portion of the lubricating oil flows into the bottom of the governor housing 9 through the gap in the bearing section, and is dammed by the partition wall 20 and remains there. In this case, the oil level is normally maintained at the same level as the height of the upper end of the partition wall 20, as shown in FIG. It is used for Therefore, for example, if the oil level fluctuates due to the rotation of the camshaft 4 or the lubricating oil 30 is supplied excessively, and the oil level exceeds the height of the partition wall 20, those lubricating oils 30 will be The oil flows down along the outer surface of the wall 20 and reaches the oil outlet 21
The oil is then discharged into the oil pipe 25 via the connecting bolt 22 and the eye bolt 23. In this case, the oil outlet 21 on the outer surface of the partition wall 20
The head of the partition wall 20 in contact with the lubricating oil 30 is
Since it is larger than the height of the inner surface, the lubricating oil is 30%
The falling speed of the lubricating oil 30 is increased, and since the oil outlet 21 is provided at the proximal end of the outer surface of the partition wall 20, the overflow of the lubricating oil 30 is quickly discharged from the oil outlet 21, and the inside of the governor chamber 12 is To protect the governor 8 , which dislikes lubricating oil, by preventing the residue of lubricating oil. Further, as the electronic governor 8 operates, the vibrations of the actuator 13 , the link 16, and the control rod 15 act on the actuator case 10, but these vibrations are transmitted to both sides of the case 10. Governor housing 9 and governor case 1 arranged in
1, it is possible to prevent the precision and life of the governor 8 from decreasing due to the vibration. Therefore, even if the lubricating oil 30 flows in large quantities or continuously into the governor chamber 12 over the partition wall 20, it is quickly discharged through the oil pipe 25 and remains in the governor chamber 12. Therefore, the components of each part of the electronic governor 8 will not be immersed in the lubricating oil, and this will not cause the electronic governor 8 to deteriorate in function or cause a decline in the function of each part. In particular, there is no problem in starting the electronic governor 8 when the temperature is low. In this embodiment, the height of the partition wall 20 is set slightly higher than the axial center position of the camshaft 4 to set the overflow level h of the lubricating oil 30, but the fuel injection pump 1 is placed horizontally with respect to the engine. In addition to the illustrated case of assembly, for example, when the injection pump 1 is assembled diagonally to the engine, the overflow level h may be set by appropriately adjusting the protruding height of the partition wall 20 according to its specifications. Become. (Effect of the invention) As described above, the lubricating oil overflow level setting structure in the fuel injection device of the present invention has a governor that can accommodate a governor partitioned by a governor housing and a governor case on the side of the cam chamber of the fuel injection pump. In a lubricating oil overflow level setting structure for a fuel injection device in which a chamber is provided and an oil outlet is provided at a lower part of the governor chamber, an actuator of the governor can be installed between the governor housing and the governor case, In addition, since an actuator case is provided whose inner lower end surface can be engaged with the lower end surface of the governor housing, the vibrations of the actuator, etc. caused by the operation of the governor are absorbed by the governor housing provided on both sides of the governor housing through the case. The vibrations can be absorbed by the governor case, thereby preventing a decrease in the accuracy and life of the governor due to the vibrations. Furthermore, since the actuator can be assembled to the case all at once, the actuator itself can be assembled before the case is assembled, and this type of assembly work can be done rationally. The oil-tightness of the joint between the case and the governor housing can be increased through the partition wall. In addition, in the present invention, a partition wall capable of damming the lubricating oil in the cam chamber is provided inwardly at the lower part of the actuator case, and is engaged with the inner surface of the lower end of the governor housing at a substantially mid-high position on the inner surface of the partition wall. Since the possible latching steps are provided in a protruding manner, the assembly position of the actuator case with respect to the governor housing is determined via the latching steps, and the assembly work can be easily performed. Furthermore, in the present invention, the oil outlet is opened downward at the base end of the outer surface of the partition wall at a position below the hanging step, and the drop on the outer surface of the partition wall to the oil outlet is made into contact with the lubricating oil. Since the height of the partition wall is larger than the possible height of the inner surface of the partition wall, the falling speed of the lubricating oil flowing down the partition wall is increased, and this oil is discharged from an oil outlet provided at a position close to the base end of the partition wall. This allows the overflow of the lubricating oil to be quickly drained and prevents it from accumulating or remaining in the governor chamber.
Can protect governors that dislike lubricating oil. In particular, this effect is suitable for a fuel injection device that makes full use of an electronic governor that does not require a large amount of lubricating oil, and has the practical effect of improving the startability of the electronic governor at low temperatures.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is an enlarged sectional view showing the main parts of the present invention. 1 ...Fuel injection pump, 3...Cam chamber, 12...
...Governor chamber, 20...Partition wall, 21...Oil outlet, 30...Lubricating oil.

Claims (1)

[Scope of utility model registration request] Overflow of lubricating oil in a fuel injection device in which a governor chamber that can accommodate a governor is provided on the side of a cam chamber of a fuel injection pump and is partitioned by a governor housing and a governor case, and an oil outlet is provided at the bottom of the governor chamber. In the level setting structure, an actuator case is disposed between the governor housing and the governor case, to which the actuator of the governor can be attached, and whose inner lower end surface can be engaged with the lower end surface of the governor housing; A partition wall capable of damming the lubricating oil in the cam chamber is protruded inward at the bottom of the case, and a latching step capable of engaging with the inner surface of the lower end of the governor housing is protruded at a substantially mid-high position on the inner surface of the partition wall. At the same time, an oil outlet is opened downward at a position below the hanging step at the base end of the outer surface of the partition wall, and the drop to the oil outlet on the outer surface of the partition wall is such that it can come into contact with lubricating oil. A structure for setting an overflow level of lubricating oil in a fuel injection device, characterized in that the height is larger than the height of the inner surface of a partition wall.