JPS58190560A - Fuel pump apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a pump plunger housed within a bore;
of the type comprising a cam device operative to impart inward engagement to the pump plunger and a distribution member for communicating said bore with the outflow boat to deliver fuel to the outflow boat F during successive inward engagements of the plunger; [Regarding g1 flip-top distribution member fuel pump device.

Such devices are known in the art and there are many variations. For example, devices are known that include a throttle or other device used to control the amount of fuel supplied to the bore during the fuel filling period. In this system, the timing of the fuel delivery rate changes as the fuel quantity changes because the end of the fuel delivery rate always occurs at the same time. Such devices usually include an adjustable cam arrangement to compensate for variations in the start of fuel delivery as the fuel quantity changes, and the cam arrangement to suit the operating requirements of the engine being fueled. Provides timing adjustment for new pickles.

In other known types of such devices, the bore is completely filled with fuel during the fuel filling period, and a slight rise from the bore during inward movement of the plunger is provided to control the fuel quantity. of fuel spills out. This fuel is vented using a relief muff provided on the distribution member, and the timing of the fuel delivery is independent of the supplied fuel, but the arrangement is such that variations in timing are accomplished using this muff. Ru. This muff increases the length of the distribution member and introduces an additional leak path.

In another form of the device, fuel can be vented by means of a distribution member which is reciprocatingly interlockable and forms a pump plunger. A relief boat is provided which must be covered by the distribution member during the first axial engagement of the distribution member by the cam ktlt. This type of system provides a constant starting action of the injection, regardless of the amount of fuel, and changes in timing are effected by changing the set position of the cam system.

Cam ii! ! The shape of the blood working surface or leading edge side determines the inward gearing speed of the plunger and therefore the fuel speed delivered by the device. In most types of devices, the actual shape of the leading edge sides must be selected to obtain the best overall performance. However, for some modern engines it is required to vary both the timing and rate of fuel delivery during engine operation, and it is the object of this invention to provide a device of the above type capable of accomplishing the above requirements. It is on offer.

According to this invention, the above-mentioned type of device has a 1# stone device at a set position of the cam device, where the point of inward interlocking of the plunger is connected to the drive shaft of the device and serves as an imprint. a relief boat positioned in communication with the bore, and a valve device for controlling fuel flow irregularities through the relief port Y, the cam device including an action or leading edge side having a variable speed profile;
This allows the fuel release timing and fuel delivery rate to be changed during use of the device, and the amount of fuel determined by the amount of time during inward travel of the plunger with the escape boat closed.

The present invention will be explained with reference to a practical example of a fuel pump device according to the present invention with reference to the accompanying drawings.

At -, the pump arrangement includes a housing, generally designated 10, which houses a fixed sleeve 11 forming an internal bore, in which a rotary circular dispensing Ffi
Twelve kidnappers are being held. Distribution stand 1.14s11-
is coupled to a drive shaft, which extends outside the housing and, in use, is coupled to a concentric rotation 613 of the mounting I1IA that is supplied with fuel by this device.

The drive shaft mounts a steel member 14 which is connected to the drive shaft using splines and extends around the major portion of the distribution member. The 'fjIF4 shaped member has a pair of holes for accommodating the shoes 15 each having a mouth member 16 attached thereto. The shoes engage respective outer ends of pump plungers 17, which are received within unidirectional bores 18 formed in the distribution member and communicating with longitudinal passages 19.

The channel 19 communicates at one point with a delivery passage 20, which in turn has an outflow passage 21, only one of which is shown in the figure, which is formed in the sleeve 11 and which communicates with an outflow part 22 formed in the housing. Aligned. When in use, the exit part 22
are connected to each injection nozzle of the mounting machine. Passage 1
Reference numeral 9 denotes an inflow/relief passage 2 for the number of compartments extending to the periphery of the distribution member.
Connects with 6.

The device also includes a low-pressure feed pump 24 having an outlet connected to a feed passage 25 formed in the sleeve 11 . The pump 24 has an inlet that is rimmed to the fuel inlet 26 of the device, and a relief well indicated at 27 is provided to control the outlet pressure of the feed pump. The supply passage 25 is connected to the inflow boat 28 and the rudder 31M, and the inflow boat is connected to the passage 2.
distribution bj at one position such that 3 matches it
Open on the periphery of the X material. The sleeve is also formed with a relief boat 29, which is positioned so that the passageway 23 is aligned therewith. The flow of fuel through the relief boat is controlled by a relief valve, generally indicated at 60, which includes a valve section 61 biased by a spring 62 to the 1" position, the valve indicated at 56 and Member 61
is moved to the closed position 'ai' by supplying current to the electromagnetic garment 1, which includes an armature 64 coupled to the armature 'ai'. The fuel flowing through the valve h6 material 61 flows through the outflow portion 65 of the housing.
Flow to.

In order to move the plunger 17 inward, the roller 1
6 is arranged in the housing and engages by means of an actuating device 67 with the inner peripheral surface of an annular cam ring 3 which performs an angular retardation 11II about the axis of rotation of the distribution member. Actuation device k37
The cam ridges on the cam ring 66 are arranged in pairs and are connected to the outflow boat 22 and the passageway 23, for example operated by pressure fuel from the outlet of the supply pump under the control of a T-type operating valve. The same number of cam ridges are provided. The side profile of the @iJ edge of the cam crest is shown in Figure 2.
These are so-called variable speed types.

In FIG. 2, the movement of the plunger is vertically blit, and the relative angular interlocking of the roller and cam crest is blit horizontally. As seen in FIG. 2, depending on the portion of the cam profile used, the engagement of the plunger and thus the amount of fuel delivered by the device will vary for a given relative angular engagement of the distribution member and cam arrangement. Therefore, from this diagram, the same relative angle is linked! It can be seen that different quantities Q□ and Q2 can be obtained for. This shows that NQ2 is larger than Q-factor and the fuel delivery rate increases. On the contrary,
If the quantities are kept the same, the times will be different.

The operation of this device will be described below. As shown, aisle 2
5 is connected to the inflow &-) 2 B, which starts the filling stage of the device. Fuel is supplied at an unlimited rate,
The plunger 17 is connected to the inwardly facing surface of the cam ring and the roller 16.
contact, or are moved outwardly to their maximum travel perimeter as determined by suitable stops. When the distribution member rotates once, the passage N23 moves and is no longer aligned with the five-person boat 28, and the delivery passage 20 is brought into alignment with the outflow portion 21. Furthermore, the passage 26 is aligned with the escape boat 29. Additionally, as the rollers 16 begin to climb up the leading side of each cam ridge, fuel is displaced from the bore 18 and flows into the longitudinal passage 19. If the relief valve 30 is closed, the fuel flows through the delivery passage 20. during inward engagement of plunger 17, if valve 60 is opened, the flow of fuel through outlet 22 is stopped;
The fuel follows the escape boat 29 to the outlet 35 and reenters the fuel system. Plunger moves inward
During the running time, passageway 26 is in alignment with relief valve 29.

The b' period of relief valve 60 determines the amount of fuel supplied to the installed engine. Furthermore, the time point at which this valve closes defines the time point at which fuel delivery #M begins. Late closing of the valve during inward movement of the plunger will result in a higher fuel delivery rate, as seen in FIG. 2, but if the valve closes prematurely, at least the initial flow rate of fuel will be reduced.

If relief valve 60 is actuated simultaneously during each cycle,
The angle of the cam ring 56 determines whether fuel is delivered at low speed or high speed. In this case, it is clearly necessary to adjust the time during which the relief valve is thresholded by the fuel delivery rate to ensure that the fuel quantity remains the same.

The operation of the relief valve and cam actuator 1' 1157 is very well implemented by an electronic control circuit. In order to function for this purpose with the required precision, it is necessary for the control circuit to be supplied with a signal indicating the angular position of the distribution member, which in the illustrated determination embodiment is achieved by a transducer 38; This transducer consists of a gear 3 mounted on a member 14.
9 to provide a signal to the control system when the tooth passes through a perturbation.

[Brief explanation of the drawing]

Fig. 1 is a cutaway side view of the device according to Nanaaki, Fig. 2 is a cam ridge 61 forming the B15 portion of the front according to the present invention;
This is the glue surface showing the outline shape of. Circular sign.

Claims (1)

[Scope of Claims] 1. A Bon 1 plunger housed in an inner hole, a cam device that operates to provide inward interlocking to the pump plunger, and a cam device that communicates the inner hole with an outflow port of the pump plunger. setting position of the distribution member and the cam mold which act to deliver fuel to the outflow boat during successive inward engagements, thereby changing the point of inward engagement of the plunger with respect to the drive shaft of the device; 1llW joint gourd, a relief boat positioned in communication with the bore, and a valve device for controlling miscarriage of fuel flowing through the relief boat;
The cam device has a speed-varying action or leading edge side so that the timing of fuel delivery and the rate of fuel delivery can be changed during use of the device, and the inward movement of the plunger with the relief boat opened. A rotary distributor type fuel pump device in which the amount of fuel is determined by the period in between. 2. A recombination boat is formed in a sleeve surrounding a distribution member, the distribution member having a passageway positioned to communicate with the bore and then with the relief boat. Fuel pump device 3. #Claims in which the valve distribution device is arranged in a section attached to the housing carrying the sleeve.
! fl Fuel pump electrical manufacturing described in item 2. 4# Special feature where the Kiben device is operated electrically! A fuel pump device as set forth in claim fIh1 or wh2. 5. The fuel maintenance device according to claim 1, further comprising a device for adjusting the angular position of the cam device about 1M around the rotation axis of the distribution member.