CN214304133U - Oil inlet valve component with adjustable oil inlet pressure of fuel supply system - Google Patents
Oil inlet valve component with adjustable oil inlet pressure of fuel supply system Download PDFInfo
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- CN214304133U CN214304133U CN202120401173.XU CN202120401173U CN214304133U CN 214304133 U CN214304133 U CN 214304133U CN 202120401173 U CN202120401173 U CN 202120401173U CN 214304133 U CN214304133 U CN 214304133U
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- inlet valve
- oil inlet
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Abstract
The utility model discloses an inlet valve component with adjustable oil inlet pressure of a fuel oil supply system, which comprises an oil inlet valve core, an inlet valve spring limiting seat, an oil inlet valve seat and an inlet valve spring, and is characterized by also comprising an adjusting gasket and a split washer, wherein the upper part of the oil inlet valve core is provided with a circle of groove; the adjusting gasket is arranged on the upper part of the oil inlet valve core, the split retainer ring is arranged in the ring groove on the upper part of the oil inlet valve core, the axial position of the oil inlet valve spring limiting seat relative to the oil inlet valve core is adjusted, and the nominal height of the oil inlet valve spring mounting space is adjusted. The utility model discloses can enlarge the dimensional tolerance who influences each relevant part of inlet valve spring installation space height H, the manufacturing of being convenient for reduces production manufacturing cost. Meanwhile, the disassembly and rework are convenient, and the qualification rate of finished products is improved.
Description
Technical Field
The utility model relates to an oil feed valve part in the common rail pump assembly of diesel engine high pressure common rail system, in particular to oil feed valve part with adjustable fuel supply system oil feed pressure.
Background
The oil inlet valve part of the current traditional high-pressure common rail pump is in a cone valve structure, as shown in fig. 1 and 2. The oil inlet valve core 1 and the oil inlet valve seat 4 are assembled to form a precise matching part, and the upper conical surface 1a of the bottom plane of the oil inlet valve core 1 and the inner conical surface 4a of the lower cavity of the oil inlet valve seat 4 are sealed. The inner hole of the oil inlet valve spring 3 penetrates through the oil inlet valve core 1 to be assembled and fixed with the upper boss 4b of the oil inlet valve seat 4, the inner hole of the oil inlet valve spring limiting seat 2 is assembled with the oil inlet valve core 1 in an interference fit mode, and the lower boss 2a of the oil inlet valve spring limiting seat 2 is assembled with the inner hole of the oil inlet valve spring 3 and limits the upper portion of the oil inlet valve spring 3. At this time, the inlet valve spring 3 is in a pre-compressed state. When the oil inlet valve component is in an inoperative state, the upper conical surface 1a of the bottom plane of the oil inlet valve core 1 is attached and sealed with the inner conical surface 4a of the lower cavity of the oil inlet valve seat 4 under the action of the spring force generated by pre-compression of the oil inlet valve spring 3. When the oil inlet valve component is in a working state, namely when the plunger of the oil supply pump moves downwards, the oil inlet valve core 1 on the oil inlet valve component overcomes the precompression force of the oil inlet valve spring 3 under the action of oil inlet pressure to push the oil inlet valve core 1 to move downwards, the upper conical surface 1a of the bottom plane of the oil inlet valve core 1 is separated from the inner conical surface 4a of the lower cavity of the oil inlet valve seat 4, and fuel enters the plunger cavity at the lower part through a gap between the two.
The size of the oil inlet opening pressure of the oil inlet valve component of the high-pressure common rail pump is determined by the pre-compression amount of the oil inlet valve spring 3 arranged on the upper part of the oil inlet valve component under the condition that the pressure bearing area of fuel oil on the conical surface 1a on the upper part of the bottom plane of the oil inlet valve core 1 and the rigidity of the oil inlet valve spring 3 are set. As shown in fig. 1 and 2, that is, the installation height H of the oil inlet valve spring 3 in the oil inlet valve member. The oil inlet valve part with the structure has the following defects in the practical use process:
1. in the existing traditional oil inlet valve component, an oil inlet valve core 1 and an oil inlet valve spring limiting seat 2 are pressed in and assembled through interference fit. If the hydraulic pressures of the hydraulic machines are different in magnitude due to the interference of tolerance difference fit of the two parts, the large interference needs to be adjusted to increase the pressure of the hydraulic machine, and the efficiency is low due to frequent adjustment of the hydraulic machine. If the pressure of the hydraulic press is not adjusted, the two parts are matched in a grading mode according to the tolerance, and therefore the efficiency is low.
2. The nominal height H of the installation space of the oil inlet valve spring 3 is calculated according to an assembly dimension chain, but because manufacturing or machining tolerances exist in all parts, the nominal height H may exceed a range value specified by the opening pressure of the oil inlet valve when the part tolerances are in a limit state. Because the existing measurement of the opening pressure of the oil inlet valve component is performed after the interference press-fitting of the oil inlet valve core 1 and the oil inlet valve spring limiting seat 2 shown in fig. 1 is completed, once the oil inlet opening pressure of the oil inlet valve component is out of tolerance, although the opening pressure of the oil inlet valve is within a specified range by adjusting the tolerance of related parts, the free height and the manufacturing tolerance of some parts, such as the oil inlet valve spring 3, are difficult to reduce, and if the free height and the manufacturing tolerance are reduced, the equipment and the manufacturing cost are higher.
3. Some oil inlet valve components cannot be reworked due to the fact that opening pressure is poor, so that the oil inlet valve components are scrapped, and the qualified rate of finished products is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving current diesel engine high pressure common rail pump oil feed valve part and leading to condemned shortcoming because of the height opening pressure super-poor of unable nimble control inlet valve spring installation space when the assembly, and provide a novel structure can adjust inlet valve spring installation space height in a flexible way to satisfy the oil feed valve part with adjustable fuel supply system oil feed pressure of required opening pressure design value in the design, it has overcome the above-mentioned defect that current high pressure common rail pump oil feed valve part exists.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an oil inlet valve component with adjustable oil inlet pressure of a fuel oil supply system comprises an oil inlet valve core, an oil inlet valve spring limiting seat, an oil inlet valve seat and an oil inlet valve spring, wherein the oil inlet valve core and the oil inlet valve seat are assembled into a precise coupling part; the oil inlet valve is characterized by further comprising an adjusting gasket and an opening check ring, and a ring of groove is formed in the upper part of the oil inlet valve core; the adjusting gasket is arranged on the upper part of the oil inlet valve core, the split retainer ring is arranged in the ring groove on the upper part of the oil inlet valve core, the axial position of the oil inlet valve spring limiting seat relative to the oil inlet valve core is adjusted, and the nominal height of the oil inlet valve spring mounting space is adjusted.
The utility model discloses a preferred embodiment, the hole tolerance of the spacing seat of inlet valve spring can enlarge, makes the spacing seat of inlet valve spring with adopt clearance fit between the oil feed case, makes the spacing seat of inlet valve spring is in the face of cylinder of oil feed case slides from top to bottom.
The utility model discloses a preferred embodiment, the hole of the spacing seat of inlet valve spring with fit clearance between the oil feed case is 0.05 ~ 0.1 mm.
Due to the adoption of the technical scheme, the utility model discloses an inlet valve part has following advantage at least:
(1) the grading matching of part tolerance when the oil inlet valve spring limiting seat is in interference fit with the oil inlet valve core is reduced, or the phenomenon that the oil inlet valve spring limiting seat cannot limit and even fall off due to frequent opening and closing of the oil inlet valve on the cylindrical surface of the oil inlet valve core because of large interference magnitude or the oil inlet valve spring limiting seat cannot limit and the opening pressure is over-poor due to too small interference magnitude is avoided, the oil inlet valve cannot be sealed during oil pumping of a plunger piston, and diesel cannot be pressed into a common rail pipe, so that insufficient oil supply is caused, and the oil supply efficiency is influenced.
(2) The dimensional tolerance of each related part influencing the installation space height H of the oil inlet valve spring can be enlarged, the production and the manufacture are convenient, and the production and the manufacture cost are reduced.
(3) The disassembly and rework are convenient, and the qualification rate of finished products is improved.
Drawings
FIG. 1 is a schematic view showing a state in which a conventional oil feed valve element is closed.
FIG. 2 is a schematic view showing a state in which a conventional oil feed valve member is opened.
Fig. 3 is a schematic structural diagram of the utility model.
Detailed Description
The invention is further described below with reference to the accompanying drawings and the detailed description.
Referring to fig. 3, the fuel inlet pressure adjustable fuel inlet valve component of the fuel supply system shown in the figure comprises a fuel inlet valve core 1, a fuel inlet valve spring limiting seat 2, a fuel inlet valve seat 4, a fuel inlet valve spring 3, an adjusting gasket 6 and a split washer 5, wherein the fuel inlet valve core 1 and the fuel inlet valve seat 4 are assembled into a precise coupling part, and an upper conical surface 1a of a bottom plane of the fuel inlet valve core 1 is sealed with an inner conical surface 4a of a lower cavity of the fuel inlet valve seat 4; the inner hole of the oil inlet valve spring 3 penetrates through the oil inlet valve core 1 to be assembled and fixed with the upper boss 4b of the oil inlet valve seat 4, the inner hole of the oil inlet valve spring limiting seat 2 is assembled with the oil inlet valve core 1 in an interference fit mode, and the lower boss 2a of the oil inlet valve spring limiting seat 2 is assembled with the inner hole of the oil inlet valve spring 3 and limits the upper portion of the oil inlet valve spring 3.
A ring of grooves 1b are formed in the upper part of the oil inlet valve core 1; the adjusting gasket 6 is arranged on the upper part of the oil inlet valve core 1, the split retainer ring 5 is arranged in the ring groove 1b on the upper part of the oil inlet valve core 1, the axial position of the oil inlet valve spring limiting seat 2 relative to the oil inlet valve core 1 is adjusted, and the nominal height H of the installation space of the oil inlet valve spring 3 is further adjusted.
The tolerance of the inner hole of the oil inlet valve spring limiting seat 2 can be enlarged, so that the oil inlet valve spring limiting seat 2 and the oil inlet valve core 1 are in clearance fit, and the oil inlet valve spring limiting seat 2 slides up and down on the cylindrical surface of the oil inlet valve core 1. The fit clearance between the inner hole of the oil inlet valve spring limiting seat 2 and the oil inlet valve core 1 is 0.05-0.1 mm.
The utility model discloses at 1 upper portion processing fixed split ring 5's of oil feed case circle groove 1b, split ring 5 passes through the opening and fixes a position with this circle groove 1b cooperation, and split ring 5 increases an adjusting shim 6 in the middle of contacting with inlet valve spring 3, and inlet valve spring spacing seat 2 can be in the outer face free slip of cylinder of oil feed case with adjusting shim 6. When the oil inlet opening pressure of a traditional oil inlet valve part is in a median value, the nominal height H value of the installation space of the oil inlet valve spring 3 is increased by 0.3-0.5 mm, and the increased space height dimension of 0.3-0.5 mm is compensated to the thickness of the adjusting gasket 6; the thickness of the adjusting gasket 6 is graded according to 0.1mm, and when the opening pressure of the oil inlet valve is lower than a designed value, the thickness of the adjusting gasket 6 is increased; when the opening pressure of the oil inlet valve is higher than a designed value, the thickness of the adjusting gasket 6 is reduced.
Claims (4)
1. An oil inlet valve component with adjustable oil inlet pressure of a fuel oil supply system comprises an oil inlet valve core, an oil inlet valve spring limiting seat, an oil inlet valve seat and an oil inlet valve spring, wherein the oil inlet valve core and the oil inlet valve seat are assembled into a precise coupling part; the oil inlet valve is characterized by further comprising an adjusting gasket and an opening check ring, and a ring of groove is formed in the upper part of the oil inlet valve core; the adjusting gasket is arranged on the upper part of the oil inlet valve core, the split retainer ring is arranged in the ring groove on the upper part of the oil inlet valve core, the axial position of the oil inlet valve spring limiting seat relative to the oil inlet valve core is adjusted, and the nominal height of the oil inlet valve spring mounting space is adjusted.
2. The fuel inlet valve component with the adjustable fuel inlet pressure of the fuel supply system as claimed in claim 1, wherein the tolerance of the inner hole of the fuel inlet valve spring limiting seat can be enlarged, so that the fuel inlet valve spring limiting seat and the fuel inlet valve core are in clearance fit, and the fuel inlet valve spring limiting seat slides up and down on the cylindrical surface of the fuel inlet valve core.
3. The oil inlet valve component with the adjustable oil inlet pressure of the fuel oil supply system as claimed in claim 2, wherein the fit clearance between the inner hole of the oil inlet valve spring limiting seat and the oil inlet valve core is 0.05-0.1 mm.
4. The fuel inlet pressure-adjustable fuel inlet valve member for a fuel supply system according to claim 1, wherein the thickness of said adjusting shim is graded to 0.1mm, and when the opening pressure of the fuel inlet valve is lower than a design value, the thickness of the adjusting shim is increased; and when the opening pressure of the oil inlet valve is higher than a designed value, reducing the thickness of the adjusting gasket.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020230752291 | 2020-12-18 | ||
| CN202023075229 | 2020-12-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214304133U true CN214304133U (en) | 2021-09-28 |
Family
ID=77834723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120401173.XU Active CN214304133U (en) | 2020-12-18 | 2021-02-23 | Oil inlet valve component with adjustable oil inlet pressure of fuel supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214304133U (en) |
-
2021
- 2021-02-23 CN CN202120401173.XU patent/CN214304133U/en active Active
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