CN117212012A - Novel switch valve direct control type high-pressure oil pump - Google Patents
Novel switch valve direct control type high-pressure oil pump Download PDFInfo
- Publication number
- CN117212012A CN117212012A CN202311180061.6A CN202311180061A CN117212012A CN 117212012 A CN117212012 A CN 117212012A CN 202311180061 A CN202311180061 A CN 202311180061A CN 117212012 A CN117212012 A CN 117212012A
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- oil
- plunger
- valve
- pump
- driving shaft
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- 239000003921 oil Substances 0.000 claims abstract description 120
- 238000005461 lubrication Methods 0.000 claims description 20
- 239000000295 fuel oil Substances 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 239000000446 fuel Substances 0.000 abstract description 8
- 239000010687 lubricating oil Substances 0.000 abstract description 4
- 230000001050 lubricating effect Effects 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 3
- 239000002283 diesel fuel Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Abstract
The invention relates to the technical field related to high-pressure common rail fuel systems, and discloses a novel switch valve direct control type high-pressure oil pump, which comprises a flange bearing seat, a pump body part, a plunger part, a cycloid oil pump, a driving shaft and an overflow valve part, wherein the cycloid oil pump consists of an inner rotor, an outer rotor, a lining plate and an oil pump cover; the contact length between the plunger and the roller bearing bush becomes longer, the contact stress between the plunger and the roller bearing bush is reduced, the reliability of the plunger and the roller is improved, and the lubricating oil quantity is limited in a controllable range at low speed by controlling the ratio of the flow area of the throttling device to the lubricating gap, so that the starting is not influenced. At high speed, the lubricating oil quantity is increased, and the heat generated by the friction of the bearing bush is taken away.
Description
Technical Field
The invention relates to the related technical field of high-pressure common rail fuel systems, in particular to a novel switch valve direct control type high-pressure oil pump.
Background
In recent years, with the continuous improvement of environmental awareness and the continuous strictness of environmental protection policy, low-power diesel engines are also continuously developing toward more environmental protection and high efficiency. The traditional mechanical pump has low cost and simple maintenance, but the fuel injection precision and response speed are lower due to low fuel pressure, so that the combustion efficiency, dynamic property, stability, emission and other performances of the engine cannot be improved to the maximum extent. Therefore, compared with the traditional mechanical pump, the common rail pump has higher fuel efficiency and better power performance, and becomes the first choice for replacing the common rail pump. However, the common rail pump also has the defects of higher cost, large occupied installation space, heavy weight, poor robustness, high maintenance difficulty and the like. The open-close valve direct control high-pressure oil pump is developed, the product structure is compact and light, and the combustion efficiency, the dynamic property, the stability, the robustness and the emission can all meet the application requirements of a low-power engine.
Disclosure of Invention
The invention aims to provide a novel switch valve direct control type high-pressure oil pump which is used for overcoming the defects in the prior art.
The invention is realized by the following technical scheme.
The invention relates to a novel switch valve direct control type high-pressure oil pump which comprises a flange bearing seat, a pump body component, a plunger component, a cycloid oil delivery pump, a driving shaft and an overflow valve component.
According to a further technical scheme, the cycloid oil delivery pump is composed of an inner rotor, an outer rotor, a lining plate and an oil delivery pump cover, a driving shaft is connected with the inner rotor through a key, an oil inlet hole on a pump body component is connected with an external oil tank, fuel enters a plurality of independent volume cavities formed in the engagement process of the inner rotor and the outer rotor through a fuel oil channel on the pump body component through an oil inlet groove of the lining plate, the inner rotor and the outer rotor rotate at different angular speeds and are sealed by means of an oil film, the volume of each oil cavity changes along with the phase of the driving shaft, and when the oil cavity rotates to the phase of an oil outlet, the volume of the oil cavity is reduced, the pressure is increased, and the fuel flows from the oil outlet groove to a plunger component;
according to a further technical scheme, the driving shaft is of an eccentric cam structure and sleeved with roller bearing bushes, the cam of the driving shaft drives the plunger to do sine-like reciprocating motion in the vertical direction, and the phases of the oil inlet groove and the oil outlet groove on the lining plate correspond to the phase of the cam of the driving shaft.
According to a further technical scheme, the plunger component is of a switch valve direct control structure and comprises a plunger sleeve, a plunger, an oil inlet valve, an oil outlet valve and a switch valve.
Further technical scheme, the delivery valve is arranged along the central line of plunger cover with the plunger, the delivery valve is arranged on same axis with the ooff valve, arranges along plunger cover central line contained angle, and this contained angle can be vertical also can be adjusted as required, still be equipped with oil feed passageway and oil feed valve intercommunication on the plunger cover, the opening of the direct oil feed valve of ooff valve, the structure is compacter when having guaranteed fuel feeding efficiency, effectively reduces the cost of whole when using, and the durability when using is stronger.
According to the further technical scheme, the plunger is a revolving body with a T-shaped structure, the area of the T-shaped head is enlarged, the contact length between the plunger and the roller bearing bush is longer, the contact stress between the plunger and the roller bearing bush is reduced, and the reliability and the service life of the component are improved.
According to the further technical scheme, the installation cavity of the driving shaft and the pump body component is provided with a lubrication channel, a lubrication gap and a throttling device are arranged on the lubrication channel, the size of the lubrication oil quantity is controlled by controlling the ratio of the flow area of the throttling device to the lubrication gap, and meanwhile, the lubrication requirement between the driving shaft and the pump body and the low-speed starting capability are ensured.
The invention has the beneficial effects that:
(1) the contact length between the plunger and the roller bearing bush becomes longer, so that the contact stress between the plunger and the roller bearing bush is reduced, and the reliability of the plunger and the roller is improved.
(2) By controlling the ratio of the flow area of the throttling device to the lubricating gap, the lubricating oil quantity is limited in a controllable range at low speed, and the starting is not influenced. At high speed, the lubricating oil quantity is increased, heat generated by bearing bush friction is taken away, and good lubrication is established.
(3) The cycloid oil delivery pump has the advantages of simple and compact structure, small volume, equidirectional rotation of the inner rotor and the outer rotor, mutual overlapping of each oil cavity between rotor teeth in the working cycle process, stable operation, small pulsation, low noise, high reliability of air pocket generation and high volumetric efficiency.
(4) After the lift is increased, the plunger diameter is reduced, and the plunger clearance leakage is reduced by the same displacement. The oil supply efficiency of the oil pump is greatly improved.
(5) The opening degree of the oil inlet valve is directly controlled by the switch valve, the structure is more compact, and the oil supply efficiency is ensured.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive effort for a person skilled in the art.
The invention will be further described with reference to the drawings and examples.
Fig. 1 is a schematic structural view of a high-pressure oil pump of the present invention;
FIG. 2 is a schematic illustration of a plunger assembly of the present invention;
FIG. 3 is a schematic diagram of a gerotor pump of the present invention;
fig. 4 is a schematic view of a throttle device of the present invention.
In the figure: 1. a flange bearing seat; 2. a pump body component; 3. a plunger member; 4. cycloid oil transfer pump; 5. a drive shaft; 6. an overflow valve member; 0301. a plunger sleeve; 0302. a plunger; 0303. an oil inlet valve; 0304. an oil outlet valve; 0305. a switch valve; 0401. an inner rotor; 0402. an outer rotor; 0403 lining plate; 0404 oil delivery pump cover; 7. lubrication gap 8 and throttle device
Detailed Description
The invention will now be described in detail with reference to fig. 1-4, wherein for convenience of description, the orientations described below are now defined as follows: the vertical, horizontal, front-rear directions described below are identical to the vertical, horizontal, front-rear directions of the projection relationship of fig. 1 itself.
The novel on-off valve direct control type high-pressure oil pump comprises a flange bearing seat 1, a pump body part 2, a plunger part 3, a cycloid oil delivery pump 4, a driving shaft 5 and an overflow valve part 6.
Preferably, the cycloidal oil delivery pump 4 is composed of an inner rotor 0401, an outer rotor 0402, a lining plate 0403 and an oil delivery pump cover 0404, a driving shaft 5 is connected with the inner rotor 0401 through keys, an oil inlet hole on a pump body part 2 is connected with an external oil tank, fuel oil enters a plurality of independent volume cavities formed in the engagement process of the inner rotor 0401 and the outer rotor 0402 through an oil inlet groove of the lining plate through a fuel oil channel on the pump body part, the inner rotor and the outer rotor rotate at different angular speeds and are sealed by an oil film, the volume of each oil cavity changes along with the phase of the driving shaft, when the oil cavity rotates to the phase of an oil outlet, the volume of the oil cavity is reduced, the pressure is increased, and the fuel oil flows from the oil outlet groove to the plunger part;
preferably, the driving shaft is of an eccentric structure and sleeved with a roller bearing bush, the cam of the driving shaft drives the plunger to do reciprocating motion similar to sine in the vertical direction, and the phases of the oil inlet groove and the oil outlet groove on the lining plate correspond to the phase of the cam of the driving shaft.
Preferably, the plunger component is a switch valve direct control structure, and comprises a plunger sleeve 0301, a plunger 0302, an oil inlet valve 0303, an oil outlet valve 0304 and a switch valve 0305, wherein the oil inlet valve and the plunger are preferably distributed along the central line of the plunger sleeve, the oil inlet valve and the switch valve are distributed on the same axis, an included angle is formed along the central line of the plunger sleeve, the included angle can be vertical or can be adjusted according to the requirement, an oil inlet channel is further arranged on the plunger sleeve and communicated with the oil inlet valve, the switch valve directly controls the opening of the oil inlet valve, the structure is more compact while the oil supply efficiency is ensured, the cost of the whole device is effectively reduced, and the durability of the device is stronger when in use.
Preferably, the plunger is a revolving body with a T-shaped structure, the area of the T-shaped head is enlarged, so that the contact length between the plunger and the roller bearing bush is longer, the contact stress between the plunger 0302 and the roller bearing bush is reduced, and the reliability and the service life of the component are improved.
Preferably, a lubrication channel is arranged on the installation cavity of the driving shaft 5 and the pump body part 2, a lubrication gap 7 and a throttling device 8 are arranged on the lubrication channel, the size of the lubrication oil quantity is controlled by controlling the ratio of the flow area of the throttling device and the lubrication gap, and meanwhile, the lubrication requirement between the driving shaft and the pump body and the low-speed starting capability are ensured.
In the oil feeding stage, the plunger 0302 descends from the upper dead point of the stroke, diesel oil enters the buffer annular belt from an oil inlet hole of the oil inlet valve, the switch valve 0305 is driven by electromagnetic force of the electromagnetic valve to jack the oil inlet valve 0303, the diesel oil enters the volume cavity of the plunger component from the buffer annular belt through an oil groove in the middle of the switch valve 0305, the diesel oil continuously enters the plunger component along with the plunger 0302 descending until the plunger 0302 moves to the lower dead point, at the moment, the electromagnetic valve stops driving the switch valve 0305, the oil inlet valve 0303 is closed along with the action of an oil inlet valve spring, and oil feeding is completed;
in the oil supply stage, the oil inlet valve 0303 is in a closed state due to the action of the spring force of the oil inlet valve spring, the oil outlet valve steel ball is also in a closed state due to the action of the oil outlet valve spring and the back pressure, at the moment, the oil inlet valve 0303, the oil outlet valve 0304 and the top of the plunger 0302 form an oil pressure area, the pressure in the oil pressure area gradually increases along with the ascending of the plunger 0302, when the pressure in the oil pressure area is compressed to be higher than the resultant force of the back pressure and the spring force after the oil outlet valve 0304, the oil outlet valve 0304 seals the steel ball and is pushed open, the plunger component starts to provide high-pressure oil into the rail pipe until the plunger 0302 runs to the top dead center, and the oil supply stroke is finished to complete one oil inlet and oil supply cycle.
Compared with a plunger assembly in a traditional oil feed pump, the plunger 0302 is a revolving body with a T-shaped structure, the area of a T-shaped head is enlarged, and the contact length of the plunger 0302 and a roller bearing bush is longer, so that the contact stress between the plunger 0302 and the roller bearing bush is reduced, and the reliability and the service life of the component are improved.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and implement it without limiting the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (7)
1. The utility model provides a novel switch valve direct control formula high pressure oil pump which characterized in that includes flange bearing frame, pump body part, plunger part, cycloid oil transfer pump, drive shaft, overflow valve part.
2. The novel on-off valve direct control type high-pressure oil pump according to claim 1, wherein: the cycloid oil delivery pump consists of an inner rotor, an outer rotor, a lining plate and an oil delivery pump cover, wherein a driving shaft is connected with the inner rotor through a key, an oil inlet hole on a pump body component is connected with an external oil tank, fuel oil enters a plurality of independent volume cavities formed in the engagement process of the inner rotor and the outer rotor through a fuel oil channel on the pump body component through an oil inlet groove of the lining plate, the inner rotor and the outer rotor rotate at different angular speeds and are sealed by means of an oil film, the volume of each oil cavity changes along with the phase of the driving shaft, and when the oil cavity rotates to the phase of an oil outlet, the volume of the oil cavity is reduced, the pressure is increased, and the fuel oil flows to the plunger component from the oil outlet groove.
3. The novel on-off valve direct control type high-pressure oil pump according to claim 2, wherein: the driving shaft is of an eccentric cam structure and sleeved with a roller bearing bush, the cam of the driving shaft drives the plunger to do sine-like reciprocating motion in the vertical direction, and the phases of the oil inlet groove and the oil outlet groove on the lining plate correspond to the phase of the cam of the driving shaft.
4. A novel on-off valve direct control type high pressure oil pump according to claim 3, characterized in that: the plunger component comprises a plunger sleeve, a plunger, an oil inlet valve, an oil outlet valve and a switch valve.
5. The novel on-off valve direct control type high-pressure oil pump according to claim 4, wherein: the oil inlet valve and the oil outlet valve are distributed along the central line of the plunger sleeve, the oil inlet valve and the switching valve are distributed on the same axis, an included angle is formed along the central line of the plunger sleeve, the included angle can be vertical and can be adjusted according to requirements, the plunger sleeve is further provided with an oil inlet channel which is communicated with the oil inlet valve, the switching valve directly controls the opening of the oil inlet valve, the structure is more compact while the oil supply efficiency is ensured, the cost of the whole device is effectively reduced, and the durability of the device is stronger when the device is used.
6. The novel switch-controlled high-pressure oil pump of claim 4, wherein: the plunger is a revolving body with a T-shaped structure, the area of the T-shaped head is enlarged, and the contact length between the plunger and the roller bearing bush is longer, so that the contact stress between the plunger and the roller bearing bush is reduced, and the reliability and the service life of the component are improved.
7. The novel on-off valve direct control type high-pressure oil pump according to claim 1, wherein: the installation cavity of the driving shaft and the pump body component is provided with a lubrication channel, a lubrication gap and a throttling device are arranged on the lubrication channel, the size of the lubrication oil quantity is controlled by controlling the ratio of the flow area of the throttling device to the lubrication gap, and meanwhile, the lubrication requirement between the driving shaft and the pump body and the low-speed starting capability are ensured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311180061.6A CN117212012A (en) | 2023-09-13 | 2023-09-13 | Novel switch valve direct control type high-pressure oil pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311180061.6A CN117212012A (en) | 2023-09-13 | 2023-09-13 | Novel switch valve direct control type high-pressure oil pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117212012A true CN117212012A (en) | 2023-12-12 |
Family
ID=89045648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311180061.6A Pending CN117212012A (en) | 2023-09-13 | 2023-09-13 | Novel switch valve direct control type high-pressure oil pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117212012A (en) |
-
2023
- 2023-09-13 CN CN202311180061.6A patent/CN117212012A/en active Pending
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