CN202194757U - Fuel pump structure for preventing flameout of engine after descending slope - Google Patents

Abstract

In order to overcome the fault in the prior art that that as a fuel control shoulder excircle of a governor plunger of a whole journey throttle completely shields a fuel channel in the condition that a fuel pump of a Cummins engine only uses a whole journey throttle, the fault of flameout of an engine is resulted after descending a slope, the utility model provides a fuel pump structure for preventing flameout of an engine after descending a slope. The fuel pump structure ensures that a spacer is added between a check ring of the whole journey throttle and an idle plunger, and determines the thickness of the spacer in a way that the flow of fuel passing through the fuel channel of the whole journey throttle is the same with the throttling axle leakage flow when a throttling axle fuel way of a dipolar idle throttle is switched to be minimum. A minute gap is formed between the fuel control shoulder excircle of the governor plunger of the whole journey throttle and the fuel channel, and a certain amount of fuel flows to a fuel injector and the engine all the time in the condition that the running speed of the engine exceeds idle speed, so that the fuel pump structure ensures that the engine does not stop after descending a slope.

Description

A kind ofly guarantee vehicle fuel pump structure flame-out behind the motor descending

Technical field

The utility model relates to the engine fuel pump structure, specially refers to a kind of vehicle fuel pump structure flame-out behind the motor descending that guarantees.

Background technique

Usually, comings motor car engine fuel pump is provided with two throttles, an omnidistance throttle, the two poles of the earth throttle.Said omnidistance throttle is meant the throttle that can be used in from the idling to the maximum speed; Said the two poles of the earth throttle only comprises full throttle and throttle at idle, and the former is mainly used in the situation that needs throttle to open fully, promptly so-called full throttle, and the latter is mainly used in the situation of idling.Owing in omnidistance throttle and the two poles of the earth throttle throttle at idle is arranged all, in order distinguishing usually the throttle at idle in the omnidistance throttle to be referred to as omnidistance throttle at idle, and the throttle at idle in the throttle of the two poles of the earth to be referred to as the two poles of the earth throttle at idle.The operator is in different runnability according to motor, selects to use different throttles.Yet,, the two poles of the earth throttle is arranged on the full throttle state and is locked sometimes for easy to operate; Can not be selected or regulate; Motor is in the control running down of the omnidistance throttle of fuel pump, and at this moment, the working state of fuel pump is called as the fuel pump that only uses omnidistance throttle.When the Motor Vehicle descent run; Common way is to select the two poles of the earth throttle at idle; At this moment; The throttling slinger closes still to be exported a certain amount of fuel oil to hour fuel pump and guarantees that the internal capacity of engine system oil circuit and oil sprayer is full of fuel oil all the time, guarantees the sufficient lubrication and the cooling of oil sprayer, thereby avoids motor to produce the fault of stopping working when dropping to low speed suddenly at a high speed.Usually, throttling slinger under the idling situation is closed the sufficient lubrication and the cooling of the assurance oil sprayer of hour fuel pump output extremely, guarantee that the flame-out fuel flow of motor is referred to as throttling axle leakage flow.But; For the fuel pump that only uses omnidistance throttle, there is not the two poles of the earth throttle at idle available, have only the omnidistance throttle at idle of selection; At this moment; Omnidistance throttle is arranged on the fuel gallery on the speed regulator plunger lining through the control oil omoplate cylindrical shutoff of speed regulator plunger, makes its fuel flow suitable with throttling axle leakage flow, thereby keeps motor to be in idling mode.Yet; When Motor Vehicle is in long descent run or gradient when steep; Inertia force of motor vehicles and potential energy will promote engine running conversely; Make the rotating speed of motor surpass idling speed; Make the speed regulator plunger of omnidistance throttle fly under the piece centrifugal action to produce displacement to the right at speed regulator, until with the speed regulator plunger near idling plunger and the back-up ring that is installed in cluster spring guard shield middle part fit together can't move till, at this moment; The control oil omoplate cylindrical of omnidistance throttle speed regulator plunger had moved to right and had been arranged on the position, omnidistance throttle fuel gallery on the speed regulator plunger lining; The control of speed regulator plunger oil omoplate cylindrical has covered omnidistance throttle fuel gallery fully, does not have any fuel oil and exports oil sprayer and motor to through omnidistance throttle fuel gallery, thereby make and produce flame-out fault from dropping to low speed at a high speed suddenly behind the motor descending.

Summary of the invention

Only use under the situation of omnidistance throttle at fuel pump for overcoming the existing technology Cummins Engine; No the two poles of the earth throttle at idle is available; Thereby there is not the output of throttling axle leakage flow; When motor was in high rotational speed under the driving of inertia and potential energy, the control of omnidistance throttle speed regulator plunger oil omoplate cylindrical covered the fuel gallery that is arranged on the speed regulator plunger lining fully, does not have any fuel oil and exports oil sprayer and motor to; Cause fault flame-out behind the motor descending, the utility model proposes a kind of flame-out vehicle fuel pump structure behind the motor descending that guarantees.Flame-out vehicle fuel pump structure increased a spacer after the utility model guaranteed the motor descending between omnidistance throttle back-up ring and idling plunger, and with the thickness of the fuel flow through omnidistance throttle fuel gallery and the two poles of the earth throttle at idle throttling slinger pass identical definite spacer of throttling axle leakage flow extremely hour.

The useful technique effect of the vehicle fuel pump structure that does not stop working behind the utility model assurance motor descending is the fuel pump that guarantees only to use omnidistance throttle; Surpass under the situation of idling speed in engine running speed; When omnidistance throttle speed regulator plunger flies under the piece centrifugal action displacement to the right at speed regulator; Its maximum displacement amount to the right reduces; Between speed regulator plunger control oil omoplate cylindrical and the fuel gallery wall micro-gap is arranged, thereby have a certain amount of fuel oil to flow to oil sprayer and motor all the time, guarantee not produce flame-out fault behind the motor descending through this gap.

Description of drawings

Accompanying drawing 1 is the structural representation of the omnidistance throttle of existing technology Cummins Engine fuel pump;

Accompanying drawing 2 guarantees behind the motor descending the not schematic representation of flame-out vehicle fuel pump structure for the utility model.

Below in conjunction with accompanying drawing and specific embodiment the utility model is guaranteed that the vehicle fuel pump structure that does not stop working behind the motor descending further specifies.

Embodiment

Accompanying drawing 1 is the structural representation of the omnidistance throttle of existing technology Cummins Engine fuel pump, and among the figure, 1 is omnidistance throttle speed regulator plunger, and 2 is speed regulator plunger lining; 3 is the idling plunger, and 4 is the cluster spring guard shield, and 5 is back-up ring; 6 is the fuel gallery, and P is the centrifugal action direction, and A is that fuel oil flows to.Can know for the fuel pump that only uses omnidistance throttle, do not have the two poles of the earth throttle at idle available by figure, motor is in the control running down of omnidistance throttle all the time.When fuel pump only is in omnidistance Throttle Opening Control; Omnidistance throttle is arranged on the fuel gallery 6 on the speed regulator plunger lining 2 through the control oil omoplate cylindrical shutoff of speed regulator plunger 1; Its fuel delivery is changed, thereby realize the fuel delivery control of motor from the idling to the maximum speed.Yet; When the Motor Vehicle descent run; Inertia force of motor vehicles and potential energy will promote engine running conversely, make the rotating speed of motor surpass idling speed, make the speed regulator plunger 1 of omnidistance throttle fly to produce under the piece centrifugal action displacement to the right at speed regulator; Until with the speed regulator plunger near idling plunger 3 and the back-up ring 5 that is installed in cluster spring guard shield 4 middle parts fit together can't move till; At this moment, the control of omnidistance throttle speed regulator plunger 1 oil omoplate cylindrical had moved to right and had been arranged on 6 positions, omnidistance throttle fuel gallery on the speed regulator plunger lining 2, and the control oil omoplate cylindrical of speed regulator plunger 1 has covered omnidistance throttle fuel gallery 6 fully; Do not have any fuel oil and export oil sprayer and motor to, thereby make and produce flame-out fault from dropping to low speed at a high speed suddenly behind the motor descending through omnidistance throttle fuel gallery.

Accompanying drawing 2 guarantees behind the motor descending the not schematic representation of flame-out vehicle fuel pump structure for the utility model, and among the figure, 1 is omnidistance throttle speed regulator plunger; 2 is speed regulator plunger lining, and 3 is the idling plunger, and 4 is the cluster spring guard shield; 5 is back-up ring, and 6 is the fuel gallery, and 7 is spacer; P is the centrifugal action direction, and A is that fuel oil flows to.Can know by figure; Flame-out vehicle fuel pump structure increased a spacer after the utility model guaranteed the motor descending between omnidistance throttle back-up ring 5 and idling plunger 3, and with the thickness of the fuel flow through omnidistance throttle fuel gallery and the two poles of the earth throttle at idle throttling slinger pass identical definite spacer of throttling axle leakage flow extremely hour.When engine speed surpasses idling speed; Spacer 7 can reduce speed regulator plunger 1 and fly the maximum amount of moving to right under the piece centrifugal action at speed regulator; Make the control oil omoplate cylindrical of speed regulator plunger 1 can not cover the fuel gallery 6 that is arranged on the speed regulator plunger lining 2 fully, make the fuel gallery still keep certain fuel flow.Obviously, the degree that moves to right of speed regulator plunger 1 has confirmed that the control oil omoplate cylindrical of speed regulator plunger 1 covers the degree of fuel gallery 6, and the amount of moving to right is covered serious more more greatly, and the fuel flow of fuel gallery 6 is more little.Therefore, the thickness of spacer has been confirmed the amount of moving to right of speed regulator plunger 1, has also promptly confirmed the fuel flow of fuel gallery 6.For guaranteeing that motor is initiatively or passive flame-out when dropping to low speed at a high speed suddenly after moving at a high speed; The utility model guarantees behind the motor descending that the fuel flow of flame-out vehicle fuel pump structure fuel gallery 6 not should to use throttle at idle throttling slinger in the two poles of the earth to close to hour throttling axle leakage flow identical with fuel pump; Therefore; Should be to close thickness with the fuel flow through omnidistance throttle fuel gallery and the two poles of the earth throttle at idle throttling slinger to hour the identical definite spacer of throttling axle leakage flow; Can satisfy the requirement of the lubricated and cooling of oil sprayer with the fuel flow of the omnidistance throttle fuel gallery 6 that guarantees the utility model vehicle fuel pump structure, and guarantee behind the motor descending from dropping to low speed does not suddenly produce flame-out fault at a high speed.

The useful technique effect of the vehicle fuel pump structure that does not stop working behind the utility model assurance motor descending is to guarantee only to use the fuel pump of omnidistance throttle to surpass under the situation of idling speed in engine running speed; When omnidistance throttle speed regulator plunger flies under the piece centrifugal action displacement to the right at speed regulator; Its maximum displacement amount to the right reduces; Between speed regulator plunger control oil omoplate cylindrical and the fuel gallery wall micro-gap is arranged; Thereby there is a certain amount of fuel oil to flow to oil sprayer and motor all the time, guarantees not produce flame-out fault behind the motor descending through this gap.

Claims (1)

1. one kind guarantees vehicle fuel pump structure flame-out behind the motor descending; It is characterized in that: between omnidistance throttle back-up ring and idling plunger, increase a spacer, and with the thickness of the fuel flow through omnidistance throttle fuel gallery and the two poles of the earth throttle at idle throttling slinger pass identical definite spacer of throttling axle leakage flow extremely hour.

Images