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Yanmar Mechnical Pump

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(1)

A- type Fuel Injection Pump

1. Valve holder

2. Delivery valve

3. Pump barrel

4. Pump plunger

5. Control rack

6. Control sleeve

7. Plunger return spring

8. Spring seat

9. Roller tappet

10. Camshaft

(2)

Plunger Operation

Zero Delivery

Partial Delivery

Maximum Delivery

1. Pump Barrel

2. Inlet Port

3. Pump plunger

4. Helix

5. Control rack

1. Plunger Helix

2. Upper and Lower

Helix

3. Starting Groove

(3)

Plunger Phases

BDC

Prestroke

Retraction

Lift

Residual

Stroke

Effective

Stroke

Plunger

Stroke

Fuel Intake

Delivery

Fuel

Discharge

TDC

Start of Delivery

End of intake

(4)

Delivery Valve

1. Delivery valve holder

1. Valve seat

2. Delivery valve spring

2. Retraction piston

3. Delivery valve

3. Ring-shaped groove

4. Valve seat

4. Valve stem

5. Valve holder

5. Vertical slot

What is the purpose of the delivery valves ?

1. To interrupt the high pressure circuit between fuel injection lines and pump plunger

2. To relieve pressure lines and nozzle space which causes the nozzle to close rapidly

thus preventing undesirable fuel dribble.

What is the purpose of the retraction piston ?

To separate the pipe line against element chamber,

(5)

RDV Valve

What is the purpose of the RDV valve ?

1. Faster peak pressure and filling of high pressure pipe,

opened through bore.

2. Maintains feed pressure of 3-3.5 bar in the element chamber and

pipes when engine is not running.

(6)

GDV – Constant Pressure Valve

1. Ball

2. Spring seat

3. Compression spring

4. Filler piece

5. Valve holder

6. Valve element

7. Valve spring

When are these constant pressure valves used ?

For high pressure fuel injection pumps which develop

Pressures above 800 bar and high speed DI engines.

What are the advantages for this type of valves ?

It avoids cavitation in the fuel pressure lines and

Improves hydraulic stability.

(7)

P Type Pump

How long is the plunger stroke ?

10 mm

How high is the peak injection

Pressure ?

Delivery valve

Fuel gallery

Plunger barrel

Plunger return spring

Roller tappet

Camshaft

Cam lobe

Prestroke discs beneath the barrel and valve assembly

Approximately 800 bars

Control rod

How is the injection pump lubricated ?

Control sleeve

From the engine lubrication system

How far does the control rod travel ?

Approximately 21 mm

Where are these pumps fitted ?

Commercial vehicles, stationary

engines

(8)

MW Type Pump

Delivery valve holder

Filler piece

Delivery valve spring

Plunger flange assy

Delivery valve

Inlet bore

Plunger helix

Upper spring seat

Control sleeve

Plunger

Plunger return spring

Lower spring seat

Roller tappet

(9)

A Type Pump

1.

Delivery Valve

2.

Pump barrel

3.

Pump Plunger

4.

Control rack

5.

Control sleeve

6.

Plunger return

spring

7.

Adjusting screw

8.

Roller tappet

9.

Camshaft

10.

Cam lobe

How long is the plunger stroke ?

8 mm

How high is the peak injection

pressure ?

Approximately 440 bar

How is the injection pump lubricated ?

From the engine lubrication system

How far does the control rack travel ?

Approximately 21 mm

Where are these pumps fitted ?

Commercial vehicles and stationary

engines

How is the prestroke adjusted ?

(10)
(11)
(12)
(13)
(14)
(15)
(16)

의 탈 부착

INJECTION PUMP

,

집합 식 -

PUMP

엔진 종류에 따라 다른 유형의 장착 과정이 있다

**

.

일반적으로

YANMAR 6RAL, NIIGATA 6L16XC

등은 커플링

(Coupling)

타입으로서

분사시기 조정을 아주 간단하면서 쉽게 조정하게 구성되어 있음.

기본 과정은 어느 엔진에 한하여 동일함

-

.

이 있는데 보통

- ENGINE

2CYCLE, 4CYCLE

,

4CYCLE ENGINE

INJECTION

가 주로 많이 장착되어 있다

PUMP

.

펌프 장착에 있어 먼저 알아야 할게 분사 순서 또는 폭발 순서이다.

분사 폭발

(

)

순서는

PUMP TEST

과정에 알 수가 있다 이는 커플링에서든 아님 가바나

.

,

에서든 상관이 없다.

주의 엔진에 장착 시

과정의 시작 시점을 알아야 함

(

!

TEST

.)

에서는 폭발 순서인데 예를 들어

기 엔진을 보면 직렬

일 때

ENGINE

,

6

, 8

(

PUMP

)

또는

1 - 5 - 3 - 6 - 2 - 4

1 - 4 - 2 - 6 - 3 - 5, 1 - 3 - 5 - 6 - 4 - 2,

또는

1 - 2 - 7 - 3 - 4 - 5 - 6 - 8

1 - 8 - 4 - 3 - 6 - 5 - 7 - 2 ~ .

이때 엔진에서

1

번 또는

6, 8

번인데 주로 앞 쪽

(FLYWHEEL

반대쪽 이

)

1

번이다

펌프장착은 엔진폭발 순서와 펌프분사 순서가 맞아야 하는데 그 기준이

1

번이다

예를 들어 엔진의 앞쪽이

1

번일 경우

, (4CYCLE

엔진은 폭발순서의 절반을 나누면 된다

일 경우

로 나누면

번과

번이 시작

-

1 - 5 - 3 - 6 - 2 - 4

, 1, 5, 3

/ 6, 2, 4

1

6

인데 여기서

,

6

번 실린더

(CYLINDER)

로커 암

(ROCKER ARM)

의 배기가 닫히고 흡기가

열리는 시점)

펌프

번과 맞추면 된다 주로 펌프장착에 있어 기준은 엔진이 기준임

INJECTION

1

.(

.)

하지만 여기서도 미세 조정이 있다

.

타이밍

(FUEL TIMING).

어느 엔진이든 다가지고

있는데 메인 플레이트

,

(Main plate),

지침서 매뉴얼에 있다

,

.

) YANMAR 6RAL -18° ~ 20°,

NIIGATA 6L16XC -19° ~ 21°

.

미세 조정은

FLYWHEEL

에 주로 표시되어 있는데 상사 점 펌프에서 보면

,

(

PLUNGER

연료를 분사하는 시점이다

.)

전에 이루어진다

.

미세 조정은 타이밍을 맞추고도 연소상태 배기 온도이상 등의 문제 발생 시 조정하게

,

제작되어 있다.

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