CN205190187U - Oil pump relief valve - Google Patents

Abstract

The utility model discloses an oil pump relief valve, including valve body, case, spring and screw jam, be equipped with the oil duct in the valve body, case and spring dress are in the oil duct, and the screw stops up through the screw fixedly bottom the valve body, and the case side wall surface is equipped with the draining through -hole. Adopt the utility model discloses, product simple structure can reduce the speed of opening, closing of case, reduces the knocking noise, reducing the case and receiving the fluctuation of high pressure chest oil pressure and the vibration velocity and the frequency of production, reduction oil pump noise improves engine NVH quality.

Description

A kind of oil pump Decompression valves

Technical field

The utility model belongs to technical field of engines, is specifically related to a kind of Decompression valves of engine oil pump.

Background technique

The oil pump Decompression valves of motor is a kind of device of stabilizing machine fuel pump outlet pressure, and when outlet pressure reaches a threshold value, Decompression valves is opened, and makes a part of machine oil be back to filler opening or oil sump, reaches stable oil pressure, the effect of protection hydraulic element.

Common Decompression valves is blocked by valve body, spool, spring and screw thread and forms, and oil duct is divided into three chambers by them: hyperbaric chamber, oil back chamber and spool chamber.Original state, screw thread blocking is threaded connection fixing with valve body, is compressed by spring pre-tightening, and spool is by spring force, and its top and valve body sealing surface compress, and hyperbaric chamber and oil back chamber are separated.When hyperbaric chamber oil pressure is enough high, machine oil backs down spool, and hyperbaric chamber is communicated with oil back chamber, produces pressure release, to ensure that oil pump pumps pressure in certain safety range.But the oil pressure of hyperbaric chamber is subject to the impact of engine speed and oil pump self pump oiliness energy can produce the vibration of higher frequency, when this oil pressure oscillating region is near the initial pretightening force of spring, spool displacement back and forth can be made, produce high frequency with valve body and knock, produce abnormal sound noise, reduce using character.

Model utility content

For the above problem solved, the utility model provides the pressure-relief valve structure that a kind of structure is simple, can reduce spool knocking noise.

The technical solution of the utility model is:

A kind of oil pump Decompression valves, comprise spool, spring, screw thread blocking and valve body, be provided with valve opening in described valve body, spool and spring are contained in valve opening, and described spool side wall surface is provided with draining through hole, and screw thread blocking is housed bottom valve opening.

Further, described spool side wall surface is equidistantly provided with 4 oil leak hole.

Further, described oil leak hole is manhole.

Oil pump Decompression valves of the present utility model, owing to increasing oil leak hole in spool side, makes oil back chamber be connected with spool chamber, is full of machine oil in spool chamber.When hyperbaric chamber pressure increases suddenly, spool is pressed to opening direction and is moved, and spool chamber volume reduces, machine oil flows to oil back chamber from spool chamber, and machine oil, because of intrinsic viscosity, produces the damping contrary with spool travel when flowing, offset the pressure of a part of hyperbaric chamber, avoid that spool is too fast to be opened.On the contrary, when hyperbaric chamber pressure reduces suddenly, spool moves to closing direction by spring force effect, and spool chamber volume increases, and machine oil flows to spool chamber from oil back chamber, and engine oil flow produces pulling force, offsets a part of spring force, avoids the too fast closedown of spool.So, the unlatching of spool, the speed of closedown can be reduced, reduce knocking noise.In particular cases, the damping of engine oil flow can filter out oil pressure vibration to a certain degree, reduces spool and knocks frequency.

Accompanying drawing explanation

Fig. 1 is the pressure-relief valve structure schematic diagram of background technique.

Fig. 2 is the utility model pressure-relief valve structure schematic diagram.

Fig. 3 is valve core structure schematic diagram of the present utility model.

In Fig. 1,1-1 is former spool, and 1-2 is former spring, and 1-3 is former valve body, and 1-4 original thread blocks; 1-A is former hyperbaric chamber, and 1-B is former oil back chamber, and 1-C is former spool chamber.

In Fig. 2,1 is spool, and 2 is spring, and 3 is screw thread blocking, and 4 is valve body, and 41 is valve opening, and A is hyperbaric chamber, and B is oil back chamber, and C is spool chamber.

In Fig. 3,11 is spool oil leak hole.

Embodiment

Below in conjunction with drawings and Examples, the utility model is further described.

Fig. 1 is existing common Decompression valves, and blocked 1-4 formed by former valve body 1-3, former spool 1-1, former spring 1-2, original thread, oil duct is divided into three chambers by three: former hyperbaric chamber 1-A, former oil back chamber 1-B and former spool chamber 1-C.

Fig. 2,3 is depicted as the oil pump Decompression valves that the utility model proposes, and comprises spool 1, spring 2, screw thread blocking 3 and valve body 4, has oil duct 41 in valve body 4, spool 1 and spring 2 are contained in oil duct 41, and screw thread blocking 3 is contained in bottom oil duct 41, thus forms high-voltage oil cavity A, oil back chamber B, spool chamber C; Spool 1 side wall surface is equidistantly provided with 4 oil leak hole 11, and oil leak hole 11 is manhole, and aperture is determined according to the intensity of spool 1 and required drainage area, and oil back chamber B is connected with spool chamber C by oil leak hole 11.

Its working principle is: increase oil leak hole 11 in spool 1 side, oil back chamber B is connected with spool chamber C, is full of machine oil in spool chamber C.When spool 1 is in closed condition, open under the effect of hyperbaric chamber A height oil pressure, spool chamber C volume reduces, spool chamber C inner engine oil flows to oil back chamber B by oil leak hole 11, engine oil flow produces and moves contrary damping with spool, offsets the pressure of a part of hyperbaric chamber A, avoids the too fast unlatching of spool 1; When spool 1 is in opening state, hyperbaric chamber A oil pressure reduces, and spool 1 is closed under the active force of spring 2, spool chamber volume increases, machine oil flows back to spool chamber C by oil leak hole 11 from oil back chamber B, and a part of spring force is offset in the reverse damping that machine oil produces, and avoids the too fast closedown of spool 1.So, vibration velocity that spool 1 produces by hyperbaric chamber A pressure fluctuation and frequency can be reduced, reduce oil pump noise, improve motor NVH quality.

Claims (3)

1. an oil pump Decompression valves, comprise the blocking of valve body, spool, spring and screw thread, be provided with oil duct in valve body, spool and spring are contained in oil duct, screw thread blocking is fixed by screw thread and body base, and oil duct is divided into hyperbaric chamber, oil back chamber and spool chamber three chambers by them; It is characterized in that: described spool side wall surface is provided with draining through hole, be communicated with oil back chamber and spool chamber.

2. oil pump Decompression valves according to claim 1, is characterized in that: described spool side wall surface is equidistantly provided with 4 oil leak hole.

3. oil pump Decompression valves according to claim 2, is characterized in that: described oil leak hole is manhole.