JPS6135727Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement in an in-line injection pump device.

Conventionally, as shown in Utility Model Application No. 54-53966, for example, a plurality of barrels held in a housing, a plunger slidably inserted into the barrels and reciprocated in conjunction with the drive shaft of an engine, An oil hole in the plunger that communicates between the upper end surface and the circumferential side of the plunger, and an oil hole that is slidably fitted on the outer periphery of the plunger so as to open and close an opening on the circumferential side of the oil hole, and that slides in the barrel in the sliding direction. An injection pump device is known in which a plurality of pressurizing units each having a movable sleeve that is movably guided are arranged in parallel on one plane in one housing.

However, in this conventional device, since the control lever 102 that moves the movable sleeve in the sliding direction has a fork shape that pinches the movable sleeve from both sides, the control rod 101 has a plurality of such controls. It is difficult to insert the control rod into the housing through the opening at the end of the housing with the lever 102 assembled, so the housing must be divided as appropriate to assemble the control rod and lever. There were some problems with the structure.

The present invention has been devised in view of the above, and one embodiment thereof will be described in detail below with reference to the accompanying drawings.

In the figure, reference numeral 2 denotes a housing, and 4 denotes a plurality of barrels held within the housing, and the axes of each barrel 4 are positioned in parallel on one plane within the housing 2. 6 is a discharge valve attached to the top of each barrel 4 and connected to each cylinder of the engine, 8 is a plunger slidably fitted in each barrel 4, and 10 is a spring that urges the plunger downward. , 12 is a cam that is linked to a drive shaft of an engine (not shown) and pushes up the plunger 8; 14 is a movable sleeve that is slidably fitted on the outer periphery of the plunger 8; and 16 is fixed to each barrel 4 and engaged with the movable sleeve 14. The guide pin 18, which restricts the rotation thereof, is a sleeve rotatably supported by the barrel 4 and non-rotatably engaged with the plunger 8. The plunger 8 has an oil hole 8a that communicates between the upper end surface and the circumferential surface, and a bottomed groove 8b formed in the circumferential surface and continuous with the opening of the circumferential surface of the oil hole 8a. has an opening 14a that communicates between the inside and outside of the circumferential side. Further, the cylindrical barrel 4, a plunger 8 slidably fitted in the barrel 4, and a plunger 8 are provided.
A pressurizing unit 100 includes a spring 10 that urges the plunger downward, a cam 12 that pushes up the plunger 8, and a movable sleeve 14 that is slidably fitted around the outer circumference of the plunger 8.

Then, in the process of the plunger 8 being raised by the cam 12 from the state shown in FIG.
From the time when the peripheral side opening of the oil hole 8 and the bottomed groove 8b are closed by the movable sleeve 14, the bottomed groove 8b
Until it reaches the opening 14a of the movable sleeve 14, the pressurizing chamber 20 above the plunger 8 is pressurized by the plunger. In addition, the bottomed groove 8
As is particularly clear in FIG. 5, b extends on the outer periphery of the plunger 8 at an angle to its axis. Therefore, by rotationally displacing the plunger 8 by the sleeve 18, the stroke of the plunger 8 The timing of correspondence between the bottomed groove 8b and the opening 14a of the movable sleeve 14 can be changed, and thereby the injection amount per stroke of the plunger 8 can be adjusted. Incidentally, the rotational displacement of the sleeve 18 is carried out by displacing the rack 24, which engages with the ball 22 fixed on the sleeve 18, in its longitudinal direction.

On the other hand, the injection time is adjusted by slidingly displacing the movable sleeve 14 along the plunger 8. This sliding displacement is carried out by the above-mentioned barrel 4, which is supported by the housing 2 and is located on the side of the movable sleeve 14. an operating shaft 26 having an axis on a straight line parallel to a plane in which are arranged in parallel and perpendicular to the axis of the plunger 8; a lever 28 fixed to the operating shaft 26 and extending from the operating shaft toward the plunger 8; This is achieved by a groove 14b formed on the outer circumferential surface of the sleeve 14, which engages with the tip of the lever 28 to interlock the rotational displacement of the lever about the operating shaft 26 and the sliding displacement of the movable sleeve 14. In addition,
The outer circumferential surface of the tip of the lever 28 has a curvature that constantly contacts the inner circumferential surface of the groove 14b to prevent rattling. Further, support portions 26a at both ends of the operation shaft 26
is the operation shaft 2 bored in the side wall of the housing 2.
An opening 102 having an outer diameter larger than that of the operating shaft 26 including the lever 28 and the lever 28 is supported by the housing 2 via a bearing 30 disposed in the opening 102, and further has one end of the bearing 30. A plate 32 is interposed between the housing 2 and the housing 2 .
34 is a snap ring that is fitted into the housing 2 to prevent the bearing 30 from coming off, and 36 is a positioning pin that is implanted in the bearing 30 and penetrates through the plate 32 and engages with the housing 2.

The operation shaft 26 is attached by inserting the operation shaft 26 from the end of the housing 2 after each barrel 4, plunger 8, and movable sleeve 14 are attached to the housing 2. At this time, the lever 28 A bearing 30 and a plate 32 are fitted to the support portion 26a of the operating shaft 26 so that the operating shaft 26 can be displaced to a position farther from the barrel 4 than the normal mounting position in order to prevent interference with the barrel 4. When the movable sleeve 14 is not attached to the housing 2 and the movable sleeve 14 is at the lowest position, the operating shaft 26 is placed in the vertical position where the lever 28 fixed to the operating shaft 26 can be inserted into the groove 14b of the movable sleeve 14. The operation shaft 26 is inserted into the housing 2 from the end opening of the housing 2 while holding the same. Then, due to its own weight, the lever 2 is inserted into the groove 14b of the movable sleeve 14 at the lowest position.
Displace the operating shaft 26 laterally so that the tip of the operating shaft 26 enters the support part 26a of the operating shaft 26.
The rotational displacement of the operating shaft 26 is completed by attaching it to the proper position of the housing 2 using the bearing 30 and the plate 32.
This is done by an operating lever 40 fixed at one end and an electromagnetic solenoid 44 supported by a bracket 41 on the housing 2 and rotating the operating lever 40 via a slider 42. Operation lever 4 to operate
A potentiometer 46 for measuring zero rotational displacement is supported by the bracket 41. And the seventh
As shown in the figure, the engine speed, pedal depression amount, cooling water temperature, intake air temperature, intake system boost pressure,
Information from the potentiometer 46 is sent to a control unit 52 that calculates various information sources 50 such as exhaust temperature, and is configured so that more accurate control of injection timing can be obtained by comprehensively calculating the information.

According to the above configuration, the above-mentioned Utility Application No. 54-53966
An injection pump device as shown in No. 1, that is, plungers 8 for supplying fuel to each cylinder are arranged in parallel, and the injection timing is controlled by a movable sleeve 14 fitted to each plunger. In the injection pump device,
The operating shaft 26 having the lever 28 described above is used as the movable sleeve 14, and the operating shaft 26 is connected to the bearing 3.
By supporting the housing 2 through the housing 2, the operating shaft 26 can be easily attached to the housing 2 without having to have a split structure.

In the above embodiment, the potentiometer 46 is used to measure the rotational displacement of the operating lever 40, but a differential transformer type sensor may be used instead.

Further, in the above embodiment, the electromagnetic solenoid 4
4, it is also possible to rotate the operating lever 40 using a hydraulic cylinder.

[Brief explanation of the drawing]

Figure 1 is a side view showing one embodiment of the present invention;
The figure is a view along the arrow in Figure 1, and Figure 3 is a view along the arrow in Figure 1.
Figure 4 is an exploded perspective view showing only the main parts; Figure 5 is a sectional view taken along the - line in the figure; Figure 5 is an exploded perspective view of the plunger 8.
and an enlarged perspective view of main parts of the movable sleeve 14, No. 6
1, FIG. 7 is a sectional view taken along the line - in FIG. 6, and FIG. 8 is an operating circuit diagram of the electromagnetic solenoid 44. 2; Housing, 4; Barrel, 8; Plunger, 8a; Oil hole, 14; Movable sleeve, 14b;
Groove, 16; Guide pin, 26; Operating shaft, 28; Lever, 30; Bearing, 100; Pressure unit, 10
2; Opening.

Claims (1)

[Scope of utility model registration request] A cylindrical barrel held within the housing, a plunger that is slidably inserted into the barrel and reciprocated in conjunction with the drive shaft of the engine, and a plunger that communicates between the top and side surfaces of the plunger. an oil hole, and a movable sleeve slidably fitted on the outer periphery of the plunger so as to open and close the circumferential side opening of the oil hole, and movable sleeve guided within the barrel so as to be movable only in the sliding direction. In the case where a plurality of units are arranged in parallel on one plane inside the housing, an operating shaft that is located on the side of the movable sleeve and has an axis parallel to the one plane and perpendicular to the axis of each plunger; , a lever fixed to the operating shaft and extending from the operating shaft toward each of the plungers, and a lever formed on the outer peripheral surface of each of the movable sleeves that engages with the tip of each of the levers to operate the levers. a groove for interlocking the rotational displacement about the shaft with the sliding displacement of each movable sleeve; and a groove that is bored in the side wall of the housing and on the operating axis, and that includes the operating shaft and the lever. an opening having an outer diameter larger than an outer diameter in the diametrical direction of the operating shaft, and an end of the operating shaft is supported by the housing via a bearing disposed in the opening of the housing. A row-type injection pump device.