JPS6214370Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel supply pump that is driven by a camshaft of a fuel injection pump and has a structure that allows leakage of fuel oil or lubricating oil to be easily detected from the outside.

Conventionally, a fuel supply pump that sends fuel from a fuel tank of an internal combustion engine to a fuel injection pump is driven by a camshaft 1 of the fuel injection pump as shown in FIG. An interspindle 6 is provided to slide within the pump body 2, converting rotation of the shaft 1 into reciprocating motion of a roller guide 4 via a roller 3, and further transmitting the reciprocating motion to a piston 5 that supplies fuel oil F. It is being

Then, lubricating oil is supplied to lubricate between the roller 3 and the cam and between the roller guide 4 and the main body 2. The lubrication is performed using a lubricant reservoir type or a lubricant splash type.

However, the oil seal 7 (or O
However, if the lubricating oil L supplied to the roller guide 4 side becomes clogged, for example, the lubricating oil return path to the engine becomes clogged. The pressure in the camshaft chamber increases and may mix into the fuel oil F on the piston 5 side, which has the disadvantage of increasing the consumption of lubricating oil L and causing problems such as clogging of the strainer for fuel oil F. . Furthermore, when the sliding portion of the interspindle and the main body wears out and a gap is created between the two, fuel oil gets mixed into the lubricating oil. And fuel oil F is lubricating oil L
If the lubricating oil L is mixed into the engine, the lubricating oil L will be diluted, which may cause a seizure accident in the internal combustion engine.

Therefore, in order to solve the above-mentioned conventional problems, the present invention aims to create a structure in which leakage of fuel oil or lubricating oil can be easily detected from the outside in a fuel supply pump driven by a camshaft of a fuel injection pump. That is.

That is, the present invention includes a roller guide 4 that is reciprocated via a rotating roller 3 by rotation of a camshaft 1 of a fuel injection pump, and an interspindle 6 that transmits the reciprocating movement to a piston 5 that supplies fuel oil.
The interspindle is slidably supported by a support part provided on the fuel supply pump main body 2, and lubricating oil for lubricating the roller guide etc. is supplied to the roller guide side of the support part. In a fuel supply pump of the type in which a fuel oil pump chamber is formed on the opposite side, a fitting hole 10 for an oil seal member is formed on the inner peripheral surface of the support portion, the inner diameter of which is the same in the sliding direction. A plurality of oil seal members 7, 7' are inserted into the fitting hole 10.
are fitted in series through a ring-shaped spacer 8, and a space is provided inside the spacer 8 to serve as an oil reservoir, and a leak conducting from the outer periphery of the spacer 8 to the outside of the fuel supply pump main body 2 is provided. It is characterized in that an oil detection hole 9 is provided.

A fuel supply pump according to an embodiment of the present invention will be described below with reference to FIG. 2, in which the same parts as in the conventional example shown in FIG. 1 are designated by the same part numbers.

In the embodiment of the present invention shown in FIG.
Similar to the conventional example shown in the figure, the rotation of a camshaft 1 of a fuel injection pump (not shown) causes a roller guide 4 to reciprocate via a rotating roller 3, and the reciprocating movement is transmitted to a piston 5 that supplies fuel oil F. A transmitting interspindle 6 is provided to slide within the pump body 2.

Therefore, the interspindle 6 inside the pump body 2
A fitting hole 10 for an oil seal member is formed in the inner circumferential surface of the pump body 2 at the sliding portion thereof, the inner diameter of which is the same across the sliding direction. Two oil seal members 7, 7' are arranged in series in this fitting hole 10, and a ring-shaped spacer 8 is fitted between the two oil seal members 7, 7'. A leakage oil detection hole 9 is provided inside which serves as an oil reservoir, and conducts from the outer periphery of the seater 8 to the outside of the pump body 2.
is perforated inside the pump body.

The oil seal members 7, 7' may be any conventionally used member having an oil seal effect, and of course an O-ring is also effective.

By providing the leakage oil detection hole 9 in the pump body 2 as described above, the lubricating oil L supplied to the roller guide 4 side and the fuel oil F supplied to the piston 5 side are supplied to the oil seal fitted on the outer periphery of the interspindle 6. Even if leakage occurs through the members 7 and 7', the pump body 2
It has an easily detectable structure on the outside.

According to the present invention, the fitting hole 10 for the oil seal member is formed on the inner peripheral surface of the pump body 2 at the sliding portion between the fuel supply pump body 2 and the interspindle 6,
A plurality of oil seal members 7,
7' are fitted in series through a ring-shaped spacer 8, and a leakage oil detection hole 9 is provided that conducts from the outer circumference of the spacer 8 to the outside of the fuel supply pump main body 2, so that fuel oil F or The lubricating oil L is supplied to the oil seal member 7 of the interspindle part in the pump body 2,
Even if the oil leaks to the other through 7', the occurrence of the leakage can be easily and early detected from the outside, and necessary measures such as replacing the oil seal member can be taken at an early stage. Therefore, this eliminates the problem of lubricating oil getting mixed into the fuel oil, increasing the amount of lubricating oil consumed, or clogging the fuel oil strainer, and also eliminating the problem of getting the lubricating oil mixed into the lubricating oil. It is possible to prevent the occurrence of a seizure accident in the internal combustion engine due to dilution of the lubricating oil. Further, since the fitting hole 10 of the oil seal member is formed to have the same diameter even in the case of a plurality of oil seal members, machining is easy, and the oil seal members 7, 7' can be fitted into the fitting hole 10. It is also easy to fit.
Further, a space serving as an oil reservoir is provided inside the spacer 8 (i.e., the fitting hole 10 of the oil seal member
is used as it is as an oil sump), there is no need to create a special oil sump, and the oil pressure does not increase due to the action of this oil sump, so lubricating oil L is not transferred to or from the fuel oil F side. Conversely, there is no possibility that the fuel oil F will mix into the lubricating oil L side.

Note that the present invention is effective for general reciprocating fuel supply pumps used in internal combustion engines and the like.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a conventional fuel supply pump, and FIG. 2 is a side sectional view of a fuel supply pump according to an embodiment of the present invention. 1...Camshaft, 2...Pump body, 3...Rotating roller, 4...Roller guide, 5...Piston, 6...Interspindle, 7, 7'...Oil seal member, 8...Spacer , 9... Oil leakage detection hole, 10... Fitting hole.

Claims (1)

[Scope of utility model registration request] A roller guide 4 that is reciprocated via a rotating roller 3 by the rotation of the camshaft 1 of the fuel injection pump.
and an interspindle 6 that transmits the reciprocating motion to the piston 5 that supplies fuel oil, and the interspindle is slidably supported by a support provided on the fuel supply pump main body 2, and In a fuel supply pump of the type in which lubricating oil for lubricating the roller guide etc. is supplied to the roller guide side of the roller guide, and a pump chamber for fuel oil is formed on the opposite side, the inner circumferential surface of the support part has a A fitting hole 10 for an oil seal member having the same inner diameter in the sliding direction is formed, and a plurality of oil seal members 7, 7' are fitted into the fitting hole 10 with a ring-shaped spacer 8.
At the same time, a space serving as an oil reservoir is provided inside the spacer 8, and an oil leakage detection hole 9 is provided that conducts from the outer periphery of the spacer 8 to the outside of the fuel supply pump main body 2. fuel supply pump.