JP2002235633A - Distribution type fuel injection pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent abnormal injection of a distribution type fuel injection pump caused by the high pressure of a fuel injection pressure and the lowering of lubrication of fuel. SOLUTION: A temperature sensor 4 is fitted to a head plug 3 fitted in a head IC of a pump housing 1 so that the fuel temperature in a high-pressure chamber 23 of a plunger pump 2 is directly detected to correct the fuel injection quantity. A roller bearing 7 is interposed between a sliding surface between a feed pump cover 51 of a feed pump 5 and a roller ring 61 to reduce the friction and the position of the roller ring 61 is quickly controlled by a timer T.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution type fuel injection pump which copes with a high fuel injection pressure of a diesel engine and a reduction in fuel lubricity accompanying a reduction in fuel sulfur due to exhaust gas regulations.

[0002]

2. Description of the Related Art A distribution type fuel injection pump has a leg portion provided with a drive shaft passing therethrough at one end, a body portion having a pump chamber formed therein, and a delivery valve at the other end. And a pump housing serving as a head. A vane type feed pump which is driven by a drive shaft and discharges the fuel sucked from the fuel tank to the pump chamber is provided adjacent to the pump chamber on the leg. A plunger pump, which is driven by a drive shaft and pumps fuel in a pump chamber to a nozzle mounted on a cylinder, is attached to the head.

[0003] The plunger pump is fitted into a plunger one end of which is connected to the other end of the drive shaft via a coupling and a face cam mechanism and a cylinder fitting hole formed in the head. A cylinder whose other end is slidably fitted. The outside of the cylinder fitting hole is closed by a head plug, and between the other end of the plunger and the head plug is a high-pressure chamber in which fuel is pressurized.

[0004] The distribution type fuel injection pump is equipped with a temperature sensor for detecting the temperature of the fuel, and is provided with injection amount correction means for correcting the fuel injection amount according to the output. In a vane type feed pump, a rotor driven by a drive shaft is accommodated in a vane chamber separated from a pump chamber by a feed pump cover. The face cam mechanism includes a roller ring disposed in sliding contact with the feed pump cover, and a face cam which is in pressure contact with a roller of the roller ring and connected to one end of the plunger.

When the drive shaft rotates, the plunger reciprocates while rotating, and the fuel in the pump chamber is sucked into the high-pressure chamber via the suction passage, and then is pressurized and delivered from the distribution flow passage to the delivery valve mounted on the head. Through the nozzle and injected into the cylinder from the nozzle. Thereafter, the fuel injection amount is controlled by opening the discharge port (spill port) by displacement of the spill ring or opening of the electromagnetic spill valve.

[0006] When the lubricity of the fuel is reduced due to a rise in temperature or the like, the amount of fuel leakage from the plunger pump fluctuates, and abnormal injection is likely to occur in which the injection amount deviates from an appropriate value.
For this reason, conventionally, as shown in FIG. 1, a temperature sensor S is attached to the body 1B to detect the fuel temperature in the pump chamber. In Japanese Patent Application No. 4-8955, a detection chamber communicating with the high-pressure chamber is connected to a head. And the fuel temperature is directly detected by a temperature sensor, and the engine control device (EC
U) calculates the injection amount and corrects the injection amount. However, this configuration has a problem that the structure of the head becomes complicated.

[0007] The angle of the roller ring in the radial direction is adjusted by a hydraulic timer installed on the side of the pump housing, and the fuel injection timing is adjusted. However, the sliding resistance between the feed pump cover and the roller ring has been increased due to the lack of lubricity due to the increase in fuel injection pressure and the reduction in fuel sulfur due to exhaust gas regulations. For this reason, the responsiveness of the angle adjustment of the roller ring by the hydraulic timer is reduced, and the adjustment of the injection timing is delayed, so that problems such as deterioration of emission and poor timer control are likely to occur.

Further, conventionally, the face cam and the other end of the plunger are connected to each other by a face cam pin axially attached to the face cam and a radial groove provided in the plunger. Since this connection is a line contact, the increase in the torque and the decrease in the lubricity of the fuel due to the increase in the injection pressure of the fuel increase the wear of the contact portion between the face cam pin and the plunger. The wear of the contact portion causes the fuel injection timing to change with time, causing abnormal fuel injection and deteriorating the emission.

[0009]

SUMMARY OF THE INVENTION An object of the invention described in claims 1 and 2 is to provide a temperature sensor capable of directly detecting the fuel temperature of a high-pressure chamber with a simple mounting structure and to cope with a change in fuel temperature. It is an object of the present invention to provide a distribution type fuel injection pump capable of performing appropriate control and reducing abnormal fuel injection accompanying high pressure fuel injection. A third object of the present invention is to provide a distribution type fuel injection pump which can achieve the object described in the first embodiment without increasing the pressure resistance of the temperature sensor. An object of the invention described in claim 4 is to provide a distribution type fuel injection pump capable of detecting when abnormal injection occurs or is likely to occur by a temperature sensor.

An object of the invention described in claims 5 and 6 is to enable a hydraulic timer to operate normally even when fuel pressure is high and a low lubricating fuel is used. Another object of the present invention is to provide a distribution-type fuel injection pump capable of preventing the occurrence of a fuel injection. The object of the invention described in claims 7 and 8 is to prevent the occurrence of abnormal wear at the connecting portion between the face cam and the plunger even when the fuel injection pressure is high and low lubricating fuel is used. It is an object of the present invention to provide a distribution type fuel injection pump that can prevent abnormal fuel injection and emission deterioration.

[0011]

According to the first aspect of the present invention, one end has a leg portion provided with a drive shaft therethrough, the middle portion has a body portion having a pump chamber formed therein, and the other end portion. Is a pump housing serving as a head to which a delivery valve is attached, a feed pump for discharging fuel sucked from a fuel tank to the pump chamber, and one end of the drive shaft through a coupling and a face cam mechanism. A plunger connected to the cylinder, a cylinder fitted in a cylinder fitting hole opened in the head, and the other end of the plunger slidably fitted therein, and a head plug closing the outside of the cylinder fitting hole. Fuel comprising: a plunger pump; and a fuel injection amount correcting means for correcting the fuel injection amount in accordance with the output of a temperature sensor for detecting the temperature of the fuel. In morphism pump, the temperature sensor, characterized in that attached to the head plug.

According to the second aspect of the present invention, when a through hole is formed in the center of the head plug and the heat sensitive portion of the temperature sensor is mounted in the through hole so as to be exposed to the high pressure chamber of the plunger pump, only the head plug is provided. The temperature sensor can be attached by processing, the structure is simple and the cost is low. In this case, the temperature sensor needs to have a structural strength to withstand the high pressure in the high-pressure chamber. According to the third aspect of the present invention, a blind hole is formed at the center of the head plug, and the temperature sensor is installed in the blind hole.

According to the fourth aspect of the present invention, one end is provided with a leg through which a drive shaft is disposed, the middle is a body having a pump chamber formed therein, and the other end is provided with a delivery valve. A pump housing serving as a head, a feed pump for discharging fuel sucked from a fuel tank to the pump chamber, a plunger having one end connected to the other end of the drive shaft via a coupling and a face cam mechanism, A plunger pump including a cylinder fitted into a cylinder fitting hole opened in the head and the other end of the plunger slidably fitted therein, and a head plug closing the outside of the cylinder fitting hole; And a fuel injection amount correcting means for correcting the fuel injection amount in accordance with the output of the temperature sensor for detecting the temperature of the fuel. And attaching the temperature sensor to the head plug, attaching another temperature sensor to the pump housing, and detecting a deviation of an output value between the temperature sensor and the other temperature sensor to determine that abnormal injection has occurred. Features.

According to the fifth and sixth aspects of the present invention, one end is provided with a leg through which a drive shaft is disposed, the middle is a body having a pump chamber formed therein, and the other end is provided with a delivery valve. A pump housing serving as a mounted head, including a vane chamber partitioned by the pump chamber and a feed pump cover, and a vane-type feed pump driven by a drive shaft to discharge fuel to the pump chamber; One end of which is connected to the other end of the drive shaft via a coupling, the roller ring is disposed in sliding contact with the cover of the feed pump, and a cam including a face cam disposed in pressure contact with the roller ring. A plunger having a mechanism, the other end of the plunger is slidably fitted and opened to the head of the pump housing. A dispensing type fuel comprising: a cylinder fitted in a cylinder fitting hole; a plunger pump including a head plug for closing the outside of the cylinder fitting hole; and a timer for adjusting an angle of the roller ring to adjust an injection timing. In the injection pump, a bearing is interposed between the feed pump cover and the roller ring. Note that a roller bearing is most suitable as the bearing.

According to the seventh and eighth aspects of the present invention, one end is provided with a leg through which a drive shaft is disposed, the middle is provided with a body in which a pump chamber is formed, and the other end is provided with a delivery valve. A pump housing having a mounted head, and a plunger pump having a plunger having one end connected to the other end of the drive shaft via a coupling and a face cam mechanism, wherein the face cam mechanism includes a roller. In a distribution type fuel injection pump including a held roller ring and a face cam connected to the plunger while being urged to press against the roller ring, the connection between the plunger and the face cam is performed by the face cam. The plunger is fitted with an axial hole having a cross section other than the formed circle. To. It is desirable that the structure of the fitting portion fits the plunger and the face cam in a two-sided width shape.

[0016]

According to the first or second aspect of the present invention, since the temperature sensor is attached by drilling a hole in the head plug, the processing of the head of the pump housing is unnecessary and the mounting of the temperature sensor is inexpensive. Becomes possible. A configuration in which a through hole is provided in the head plug and the temperature sensing portion of the temperature sensor is exposed to the high pressure chamber from the through hole has the highest sensitivity and improves the accuracy of correcting the fuel injection amount.

According to the third aspect of the present invention, the temperature sensor mounting hole provided in the head plug is a blind hole, and the temperature sensor is installed in the blind hole. According to the second aspect of the present invention, since the temperature sensing portion of the temperature sensor is exposed to high pressure, a pressure-resistant structure is required. In this configuration, the responsiveness is slightly reduced.
The pressure resistance of the temperature sensor is not required.

According to the fourth aspect of the present invention, the fuel temperature is detected by both a temperature sensor provided on the head plug and another temperature sensor attached to another part of the pump housing such as the body. I have. When abnormal fuel injection occurs, the fuel temperature detected by the temperature sensor provided on the head plug becomes abnormally high. Therefore, the temperature between the temperature sensor provided on the head plug and the fuel temperature detected by another temperature sensor is increased. The difference increases. Therefore, when this temperature difference exceeds a predetermined value, it can be determined that abnormal injection has occurred or is likely to occur, and necessary measures can be taken.

According to the fifth and sixth aspects of the present invention, a thrust is provided by interposing a bearing (particularly a roller bearing) between the feed pump cover and the roller ring. For this reason, even if the pressure feed of the fuel by the plunger pump becomes high and the lubricity of the fuel decreases, the frictional force between the roller ring and the feed pump cover is small, and the roller ring can be smoothly rotated by the hydraulic timer. As a result, the hydraulic timer can operate normally, and abnormal fuel injection and emission deterioration can be prevented.

According to the present invention, one end of the plunger and the face cam are connected to each other by fitting a shaft having a hole having a cross section other than a circle such as a width across flat surface with a shaft. The connection with the cam is in surface contact. As a result, even if the pressure of the fuel supplied by the plunger pump is increased and the lubrication of the fuel is reduced, it is possible to prevent abnormal wear at the connection between the face cam and the plunger, thereby preventing abnormal fuel injection and emission deterioration it can.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a first embodiment of the present invention; FIG. The distribution type fuel injection pump A includes a pump housing 1, and the pump housing 1 has a shaft hole 1 at one end (left side in the figure).
1, a body 1B provided with a pump chamber 10 in the middle, and a head 1C at the other end (right side in the figure). A drive shaft 12 is rotatably inserted into the shaft hole 11, and a cylinder fitting hole 13 coaxial with the shaft hole 11 is provided through the head 1C.
The plunger pump 2 is mounted on the inner side (the pump chamber 10 side) of the cylinder fitting hole 13, and the outer side is closed by the head plug 3.

A sensor hole 30 is formed in the head plug 3 through the center thereof.
Is fitted. Top side of head 1C (top view)
Is provided with an electromagnetic spill valve E for controlling the fuel injection amount, and the same number of delivery valves (low-pressure valves) D as the number of cylinders of the engine are mounted on the outer end face. A hydraulic timer T for controlling the fuel injection timing is provided on the side (lower side in the figure) of the body 1B.

The plunger pump 2 has a cylinder fitting hole 1
3 and a plunger 22 having one end connected to the drive shaft 12 by the coupling 15 and the other end slidably inserted into the cylinder 21. Plunger 22 in cylinder 21
A high pressure chamber 23 is provided between the other end of the head plug 3 and the head plug 3. The fuel sucked into the high-pressure chamber 23 is pressurized by the rotation and reciprocation of the plunger 22, passes through the discharge passage 24 of the plunger 22, is sent from the distribution passage 25 to the injection pipe via the delivery valve D, and is fed from the nozzle into the cylinder. Injected to.

As shown in FIG. 2, the temperature sensor 4 has a plug structure provided with a cylindrical heat-sensitive portion 41, a fastening screw portion 42, and a hexagonal portion 43 from the tip. The sensor hole 30 is
It comprises a small-diameter inner end portion 31 into which the heat-sensitive portion 41 is fitted, an inner screw portion 32 into which the fastening screw portion 42 is screwed, and a large-diameter portion 33 into which the hexagonal portion 43 is loosely fitted. Since the heat-sensitive portion 41 has a front end surface exposed to the high-pressure chamber 23, the temperature of the fuel that is pressurized and fed can be directly detected.

For this reason, the injection amount is calculated by the engine control unit (ECU) in accordance with the fuel temperature, and the injection amount correction for determining the injection amount can be appropriately performed, and the abnormal fuel injection accompanying the high pressure of the fuel injection is reduced. it can. In addition, since the concentric sensor hole 30 is provided at the center of the head plug 3, processing is easier than a case where a room communicating with the high-pressure chamber 23 is provided in the head 1 </ b> C and processing for fastening the temperature sensor 4 is performed. And the cost is reduced. In the embodiment shown in FIG. 2, since the high pressure of the high-pressure chamber 23 is directly applied to the heat-sensitive portion 41, it is necessary to increase the pressure resistance.

FIG. 3 shows an embodiment according to the third aspect of the present invention. In this embodiment, the sensor hole 30 is a blind hole whose inside is closed. Therefore, the heat-sensitive part 41 of the temperature sensor 4
Does not need to be exposed to the high-pressure chamber 23, and it is unnecessary to form the heat-sensitive portion 41 in a high pressure-resistant structure, and the cost of the temperature sensor 4 can be reduced. In this embodiment, since the heat sensing portion 41 does not contact the fuel in the high-pressure chamber 23 as compared with the embodiment shown in FIG. In order to reduce this response delay, as shown in FIG.
It is desirable that the distal end surface of the heat sensitive portion 41 and the inner wall of the sensor hole 30 are in contact with each other.

A vane type feed pump 5 which is driven by the drive shaft 12 and supplies fuel pumped from a fuel tank to the pump chamber 10 is provided on the outer periphery of the drive shaft 12 on the side of the pump chamber 10. In the feed pump 5, a vane rotor 53 connected to the drive shaft 12 is rotatably accommodated in a rotor chamber 52 partitioned from the pump chamber 10 by a feed pump cover 51. A face cam mechanism 6 is provided outside the coupling 15 in contact with the side surface of the pump chamber 10 of the feed pump cover 51.

The face cam mechanism 6 includes a roller ring 61 which is turned around an operation axis by a timer T, a roller 62 provided radially on the roller ring 61, and one end of the plunger 22 for adjusting the injection timing. And a face cam 63 that rotates in contact with the roller 62. The roller rings 61 are in pressure contact with the side surface of the pump chamber 10 of the feed pump cover 51, and the same number of rollers 62 (four in the figure) as the number of cylinders are installed on the same circumference of the roller ring 61 at equal intervals. . With the operation of the plunger pump 2, the pressure of the pumped fuel becomes thrust and the plunger 2
2 → face cam 63 → roller 62 → roller ring 61
→ Joins the feed pump cover 51.

When the pumping pressure of the plunger pump 2 increases as the fuel injection pressure increases, the roller ring 61
Thrust pressing the feed pump cover 51 increases. Conventionally, since the roller ring 61 is in sliding contact with the surface of the feed pump cover 51, the sliding resistance when sliding is increased, and the turning operation of the roller ring 61 by the timer T is performed as shown by a broken line in FIG. Since a response delay occurs, an appropriate injection timing is easily damaged.

FIG. 1 shows an embodiment of the present invention. In this embodiment, a temperature sensor 4 provided on a head plug 3 of a head 1C and a pump housing 1 such as a body 1B are provided.
And the other temperature sensor S (shown in FIG. 1) attached to the other part detects the fuel temperature. When an abnormal injection occurs, the fuel temperature detected by the temperature sensor 4 provided on the head plug 3 becomes abnormally high, so that the temperature sensor 4 provided on the head plug 3 and another temperature sensor S detect it. The temperature difference from the fuel temperature increases. Therefore, when this temperature difference exceeds a predetermined value, it is determined that abnormal injection has occurred or is likely to occur. This temperature difference is determined by an engine control unit (ECU) and necessary measures are taken to prevent abnormal injection.

FIG. 4 shows an embodiment according to the fifth and sixth aspects of the present invention. In this embodiment, a roller bearing 7 for thrust is interposed between the roller ring 61 and the feed pump cover 51. A notch step 54 is formed on the outer periphery of the surface of the feed pump cover 51, and the roller bearing 7 is fitted into the notch step 54 to bear the thrust of the roller ring 61. Further, in order to secure a fuel flow path from the feed pump cover 51 which is narrowed by the roller bearings 7, a cutout portion 55 is provided on an outer peripheral portion of the feed pump cover 51.

As in the present embodiment, the roller bearing 7 bears the thrust of the roller ring 61, so that the frictional resistance caused by the rotation of the roller ring 61 is reduced to a negligible level. As a result, the rotation operation of the roller ring 61 of the timer T has almost no response delay as shown by the solid line in FIG. In addition, a ball bearing or other friction reducing means may be adopted instead of the roller bearing 7, but the mounting space,
It is most advantageous to use the roller bearing 7 from the viewpoint of durability, thrust resistance and the like.

The face cam 6 is attached to one end of the plunger 22.
3 has been concluded. As shown in FIG.
3 is urged toward the drive shaft 12 by a spring 64, and the cam surface 65 contacts the roller 62 and rotates. When the drive shaft 12 rotates, the plunger 22 is reciprocally driven in the axial direction by the face cam mechanism 6 while rotating with the rotational force applied by the coupling 15.

As shown in FIG. 6, a conventional plunger 22 and face cam 63 are connected by a U-shaped groove 28 provided in a flange 27 at one end of the plunger 22 and a face cam 63.
This is achieved by engagement with a face cam pin 66 attached to the camera. Therefore, the transmission of the torque is a linear contact between the outer periphery of the face cam pin 66 and the inner surface of the groove 28, and as the transmission torque increases, the contact surface pressure increases and wear proceeds. In particular, when operated with light oil having low lubricity, abnormal contact wear occurs, and there is a problem that the injection amount and the injection timing change over time.

FIG. 7 shows an embodiment according to the seventh and eighth aspects of the present invention. In this embodiment, a non-circular recess 67 having a cross section in which a circle is cut off by a parallel line is formed as an axial hole having a cross section other than a circle at the center of the face cam 63, and a non-circular recess is formed at an end of the plunger 22. A two-sided width 29 is provided as a fitting portion having a non-circular cross section to be fitted into the circular recess 67 and fitted. Therefore, the connection between the plunger 22 and the face cam 63 is brought into surface contact in the rotational direction, and abnormal wear of the contact surface can be reliably prevented.

For this reason, the connection between the plunger 22 and the face cam 63 is brought into surface contact in the rotational direction, and abnormal contact surface wear can be reliably prevented. In addition, other fittings, such as a polygonal shape and a spline fit, can be adopted for the fitting portion in addition to the width across flats.

[Brief description of the drawings]

FIG. 1 is a sectional view of a distribution type fuel injection pump according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a sectional view of a main part of the distribution type fuel injection pump according to the third aspect of the present invention.

FIG. 4 is a sectional view of a main part of the distribution type fuel injection pump according to the fifth and sixth aspects of the present invention.

FIG. 5 is a graph showing characteristics of the inventions according to the third, fifth, and sixth aspects.

FIG. 6 is a front view and a side view showing a conventional connection between a plunger and a face cam.

FIG. 7 is a front view and a side view showing the connection between the plunger and the face cam according to the seventh and eighth aspects of the present invention.

[Explanation of symbols]

 Reference Signs List 1 pump housing 10 pump chamber 12 drive shaft 13 cylinder fitting hole 2 plunger pump 21 cylinder 22 plunger 23 high-pressure chamber 3 head plug 4 temperature sensor 5 vane-type feed pump 6 face cam mechanism 63 face cam 7 roller bearing E electromagnetic spill valve T Hydraulic timer

Claims (8)

[Claims] 1. A pump having a leg portion provided with a drive shaft therethrough at one end, a body portion having a pump chamber formed therein, and a head provided with a delivery valve at the other end. A housing, a feed pump for discharging fuel sucked from a fuel tank into the pump chamber, a plunger having one end connected to the other end of the drive shaft via a coupling and a face cam mechanism, and a cylinder fitted to the head. A plunger pump including a cylinder fitted into the fitting hole and the other end of the plunger slidably fitted therein, and a head plug closing the outside of the cylinder fitting hole; and a temperature sensor for detecting a temperature of the fuel. And a fuel injection amount correcting means for correcting the fuel injection amount according to the output of the distribution type fuel injection pump. Distributor type fuel injection pump, characterized in that attached to the head plug. 2. The dispensing type fuel injection pump according to claim 1, wherein a through hole is formed at the center of the head plug, and the heat sensitive portion of the temperature sensor is exposed to the through hole in the high pressure chamber of the plunger pump. A distribution type fuel injection pump characterized in that it is mounted on a fuel injection pump. 3. The distribution type fuel injection pump according to claim 1, wherein a blind hole is formed in the center of the head plug, and the temperature sensor is installed in the blind hole. 4. A pump having at one end a leg portion through which a drive shaft is disposed, a middle portion at a body portion having a pump chamber formed therein, and a pump at the other end portion having a head to which a delivery valve is attached. A housing, a feed pump for discharging fuel sucked from a fuel tank into the pump chamber, a plunger having one end connected to the other end of the drive shaft via a coupling and a face cam mechanism, and a cylinder fitted to the head. A plunger pump including a cylinder fitted into the fitting hole and the other end of the plunger slidably fitted therein, and a head plug closing the outside of the cylinder fitting hole; and a temperature sensor for detecting a temperature of the fuel. And a fuel injection amount correcting means for correcting the fuel injection amount according to the output of the distribution type fuel injection pump. A dispensing-type fuel which is attached to the head plug and another temperature sensor is attached to the pump housing, and a deviation of an output value between the temperature sensor and the other temperature sensor is detected to cause abnormal injection. Injection pump. 5. A pump in which one end side is a leg portion through which a drive shaft is disposed, a middle portion is a body portion in which a pump chamber is formed, and the other end side is a head to which a delivery valve is attached. A housing, a vane chamber partitioned by the pump chamber and a feed pump cover, and a vane-type feed pump driven by a drive shaft to discharge fuel into the pump chamber; one end of the drive through a coupling; A plunger coupled to the other end of the shaft and having a cam mechanism including a roller ring disposed in sliding contact with the cover of the feed pump, and a face cam disposed in pressure contact with the roller ring; The end side is slidably fitted and fitted into a cylinder fitting hole opened in the head of the pump housing. A dispensing type fuel injection pump including a cylinder, a plunger pump including a head plug for closing the outside of the cylinder fitting hole, and a timer for adjusting an angle of the roller ring to adjust an injection timing; A distribution type fuel injection pump, wherein a bearing is interposed between the roller ring and the roller ring. 6. The distribution type fuel injection pump according to claim 5, wherein said bearing is a roller bearing. 7. A pump in which one end is a leg in which a drive shaft is disposed and penetrated, the middle is a body in which a pump chamber is formed, and the other end is a head in which a delivery valve is mounted. A housing; and a plunger pump having a plunger one end of which is connected to the other end of the drive shaft via a coupling and a face cam mechanism. The face cam mechanism includes a roller ring holding a roller and a roller ring. A distribution type fuel injection pump comprising a face cam urged to be pressed and connected to the plunger, wherein the plunger and the face cam are formed in an axial hole having a cross section other than a circle formed in the face cam. And a fitting portion formed on the plunger and fitted into the axial hole to be connected. A distribution type fuel injection pump characterized in that: 8. The distribution type fuel injection pump according to claim 7, wherein said fitting portion has a two-sided width provided on said plunger and said face cam. pump.