CN214660575U - Oil inlet and outlet control mechanism for high-pressure common rail system - Google Patents
Oil inlet and outlet control mechanism for high-pressure common rail system Download PDFInfo
- Publication number
- CN214660575U CN214660575U CN202121114502.9U CN202121114502U CN214660575U CN 214660575 U CN214660575 U CN 214660575U CN 202121114502 U CN202121114502 U CN 202121114502U CN 214660575 U CN214660575 U CN 214660575U
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- oil inlet
- outlet valve
- oil outlet
- oil
- inlet valve
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- 238000007789 sealing Methods 0.000 claims description 14
- 238000009434 installation Methods 0.000 claims description 7
- 230000007306 turnover Effects 0.000 claims description 4
- 239000003921 oil Substances 0.000 abstract description 160
- 239000000295 fuel oil Substances 0.000 abstract description 9
- 230000007774 longterm Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 239000000446 fuel Substances 0.000 description 9
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 230000005484 gravity Effects 0.000 description 2
- 238000003872 feeding technique Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model discloses an oil inlet and outlet control mechanism for a high-pressure common rail system, which consists of a pressing sleeve, an oil outlet valve seat, an oil outlet valve core, an oil outlet valve spring, an oil inlet valve seat and an oil inlet valve spring; the utility model has the beneficial technical effects that: the compressing sleeve for the high-pressure common rail system can avoid the influence of high-frequency collision and spring coil clearance on fuel oil circulation efficiency, and guarantees long-term stable operation of the structure.
Description
Technical Field
The utility model relates to a high pressure fuel feeding technique especially relates to an business turn over oil control mechanism for high pressure common rail system.
Background
Referring to fig. 1, a high-pressure oil outlet structure of a common high-pressure common rail system is shown, a spring seat matched with an oil outlet valve spring is arranged in a compression sleeve, and an enlarged view of the compression sleeve and the spring seat is shown in fig. 2; the working principle is as follows: when the plunger moves downwards, the pressure in the plunger cavity is reduced, the oil outlet valve core moves downwards to close an inner pore passage of the oil outlet valve seat, and meanwhile, high-pressure fuel oil in the oil inlet hole jacks up the oil inlet valve seat and enters the plunger cavity; when the plunger moves upwards, the pressure in the plunger cavity rises, the oil inlet valve seat falls to shut off the oil inlet hole, meanwhile, the oil outlet valve core is jacked upwards by high-pressure fuel oil, a pore passage in the oil outlet valve seat is opened, and the high-pressure fuel oil flows through the oil outlet valve seat and then enters the high-pressure oil duct through the through hole in the spring seat; the problems with the foregoing structure are: in order to ensure the oil outlet efficiency, a radial gap is arranged at the lower port of the through hole on the spring seat, so that the fuel oil can rapidly flow out when in oil outlet (only the radial gap is arranged, the fuel oil can also enter the through hole on the spring seat under the condition that the lower end surface of the spring seat is contacted with the upper end surface of the oil outlet valve core), when the common rail system works, the oil outlet valve core can collide with the lower end of the spring seat at high frequency, after long-term use, the radial gap can deform, the flow cross section is reduced, and the oil outlet efficiency is influenced, in addition, the through hole on the spring seat is positioned in the inner hole of the oil outlet valve spring, the fuel oil at the periphery of the oil outlet valve spring can enter the through hole on the spring seat after passing through the gap of the spring ring on the oil outlet valve spring, and when in oil outlet, because the oil outlet valve spring is compressed (compared with the extended state), the gap of the spring on the oil outlet valve is greatly reduced along with the compression of the oil outlet valve spring, the high-pressure fuel flow can be instantaneously reduced, so that the pressure of a plunger cavity is increased, and the plunger pair can be stuck seriously.
SUMMERY OF THE UTILITY MODEL
To the problem in the background art, the utility model provides an business turn over oil control mechanism for high pressure common rail system, its innovation lies in: the oil inlet and outlet control mechanism consists of a pressing sleeve, an oil outlet valve seat, an oil outlet valve core, an oil outlet valve spring, an oil inlet valve seat and an oil inlet valve spring;
a first groove is formed in the upper end face of the pressing sleeve, a second groove is formed in the lower end face of the pressing sleeve, a first limiting column is arranged on the bottom face of the second groove, a plurality of communicating holes are formed between the bottom face of the first groove and the bottom face of the second groove, the lower end ports of the communicating holes and the first limiting column are arranged in a staggered mode, the distance between the lower end ports of the communicating holes and the first limiting column is larger than the line diameter of the oil outlet valve spring, and the inner diameter of the oil outlet valve spring is matched with the first limiting column;
an installation cavity matched with the oil outlet valve core is arranged on the upper end surface of the oil outlet valve seat; an annular bulge is arranged on the inner wall of the middle part of the installation cavity, and a conical surface is arranged at the upper port of the annular bulge; a third groove is formed in the bottom of the mounting cavity, and an oil inlet hole communicated with the outside in the radial direction is formed in the side wall of the lower portion of the third groove; the bottom of the mounting cavity is provided with a plurality of connecting holes, the connecting holes are used for communicating the bottom of the mounting cavity with the lower end face of the oil outlet valve seat, and the connecting holes and the oil inlet holes are arranged in a staggered manner;
a second limiting column is formed at the upper part of the oil outlet valve core, the diameter of the second limiting column is matched with the inner diameter of the oil outlet valve spring, a convex ring is arranged at the middle part of the oil outlet valve core, a contact surface is formed at the junction of the second limiting column and the convex ring, and a sealing surface is formed at the lower side surface of the convex ring; the diameter of the lower part of the oil outlet valve core is matched with the inner diameter of the annular bulge, a plurality of planes are milled on the outer wall of the lower part of the oil outlet valve core, and the planes are communicated with the lower end surface of the oil outlet valve core; an oil inlet valve cavity is arranged on the lower end face of the oil outlet valve core, a plurality of radial holes are formed in the plane, and the plane is communicated with the oil inlet valve cavity through the radial holes;
the diameter of the upper part of the oil inlet valve seat is matched with the inner diameter of the oil inlet valve spring, the diameter of the middle part of the oil inlet valve seat is matched with the inner diameter of the oil inlet valve cavity, a first step is formed at the junction of the upper part and the middle part of the oil inlet valve seat, the outer diameter of the lower part of the oil inlet valve seat is larger than the diameter of the third groove, and a second step is formed at the junction of the middle part and the lower part of the oil inlet valve seat;
the lower end face of the pressing sleeve is in contact with the upper end face of the oil outlet valve seat, and the second groove is coaxially communicated with the mounting cavity; the lower part of the oil outlet valve core is sleeved in the annular bulge, and the second limiting column is coaxially opposite to the first limiting column; when the sealing surface is contacted with the conical surface, the cavities on the upper side and the lower side of the conical surface are mutually isolated; when the sealing surface is contacted with the conical surface, a gap is reserved between the second limiting column and the first limiting column; when the sealing surface is not contacted with the conical surface, the upper side and the lower side of the annular bulge can be communicated through the plane; the upper part of the oil outlet valve spring is sleeved on the first limiting column, the upper end of the oil outlet valve spring is contacted with the bottom surface of the second groove, the lower part of the oil outlet valve spring is sleeved on the second limiting column, the lower end of the oil outlet valve spring is contacted with the contact surface, and the oil outlet valve spring is in a compressed state; the upper part and the middle part of the oil inlet valve seat are sleeved in the oil inlet valve cavity, the lower part of the oil inlet valve spring is sleeved on the upper part of the oil inlet valve seat, the lower end of the oil inlet valve spring is contacted with the first step, the upper end of the oil inlet valve spring is contacted with the bottom surface of the oil inlet valve cavity, the oil inlet valve spring is in a compressed state, and when the lower end surface of the oil inlet valve seat is contacted with the bottom surface of the mounting cavity, the port of the third groove is closed; when the lower end face of the oil inlet valve seat is contacted with the bottom surface of the mounting cavity, a gap is reserved between the second step and the lower end face of the oil outlet valve core; when the second step is contacted with the lower end face of the oil outlet valve core, a gap is reserved between the upper end face of the oil inlet valve seat and the bottom face of the oil inlet valve cavity; the oil inlet valve cavity and the plane can be communicated all the time through the radial hole.
Referring to fig. 3, 4 and 5, the principle of the present invention is:
when oil is fed, the plunger moves downwards, the pressure in the plunger cavity is reduced, at the moment, the oil outlet valve core moves downwards under the action of gravity and the oil outlet valve spring, the sealing surface is contacted with the conical surface, the cavities on the upper side and the lower side of the conical surface are mutually isolated, and synchronously, high-pressure fuel oil flowing out of the oil inlet hole jacks the oil inlet valve seat and flows into the surrounding cavities and the plunger cavity;
when oil is produced, the plunger moves upwards, the pressure in the plunger cavity rises, the oil inlet valve seat moves downwards under the action of fuel pressure, gravity and an oil inlet valve spring (high-pressure fuel enters the oil inlet valve cavity through the radial hole to apply a downward acting force to the oil inlet valve seat), the port of the third groove (namely, the oil inlet is sealed), the oil outlet valve core is synchronously jacked up by the high-pressure fuel (the high-pressure fuel also enters the oil inlet valve cavity through the radial hole to apply an upward acting force to the oil outlet valve core), the sealing surface is separated from the conical surface, the high-pressure fuel enters the cavity on the upper side of the conical surface through the plane on the oil outlet valve core and then enters the high-pressure oil duct through the communicating hole;
aforementioned theory of operation is roughly similar with prior art, the utility model discloses a core innovation point lies in having improved the structure that compresses tightly the cover, it is difficult to see out in the scheme, compare in prior art, compress tightly the cover and possessed the function that compresses tightly function and installation spring simultaneously, the spring holder has been saved, the wholeness of structure is better, easy to process, the processing degree of difficulty has been reduced, it is more meaningful, the lower port of intercommunicating pore is located the oil outlet valve spring outside, the fuel can directly get into high-pressure oil duct through the intercommunicating pore, no longer need flow through from the clearance of oil outlet valve spring upper spring circle, the clearance size of having avoided the spring circle is to the influence of flow, high frequency collision deformation problem when setting up radial breach has also been avoided simultaneously, can guarantee that fuel circulation efficiency is stable at the design value for a long time.
The utility model has the beneficial technical effects that: the compressing sleeve for the high-pressure common rail system can avoid the influence of high-frequency collision and spring coil clearance on fuel oil circulation efficiency, and guarantees long-term stable operation of the structure.
Drawings
FIG. 1 is a schematic cross-sectional view of a high-pressure oil outlet structure of a conventional high-pressure common rail system;
fig. 2 and the enlarged view of the compression sleeve and the spring seat in fig. 1;
fig. 3 is a schematic sectional view of the present invention;
fig. 4 is a schematic cross-sectional view of a high-pressure oil outlet structure of a high-pressure common rail system according to the present invention;
fig. 5 is a schematic sectional structure view of the compressing sleeve of the present invention;
the names corresponding to each mark in the figure are respectively: the oil-discharging valve comprises a spring seat A, an existing pressing sleeve B, a plunger C, a plunger cavity D, a high-pressure oil duct E, a radial notch F, a pressing sleeve 1, a first groove 1-1, a second groove 1-2, a first limiting column 1-3, a communicating hole 1-4, an oil-discharging valve seat 2, an annular bulge 2-1, a third groove 2-2, an oil inlet 2-3, a connecting hole 2-4, an oil-discharging valve core 3, a second limiting column 3-1, a radial hole 3-2, an oil-discharging valve spring 4, an oil-feeding valve seat 5 and an oil-feeding valve spring 6.
Detailed Description
The utility model provides an business turn over oil control mechanism for high pressure common rail system which innovation lies in: the oil inlet and outlet control mechanism consists of a pressing sleeve 1, an oil outlet valve seat 2, an oil outlet valve core 3, an oil outlet valve spring 4, an oil inlet valve seat 5 and an oil inlet valve spring 6;
the oil outlet valve is characterized in that a first groove 1-1 is formed in the upper end face of the pressing sleeve 1, a second groove 1-2 is formed in the lower end face of the pressing sleeve 1, a first limiting column 1-3 is arranged on the bottom face of the second groove 1-2, a plurality of communicating holes 1-4 are formed between the bottom face of the first groove 1-1 and the bottom face of the second groove 1-2, the lower end port of each communicating hole 1-4 and the first limiting column 1-3 are arranged in a staggered mode, the distance between the lower end port of each communicating hole 1-4 and the first limiting column 1-3 is larger than the wire diameter of the oil outlet valve spring 4, and the inner diameter of the oil outlet valve spring 4 is matched with the first limiting column 1-3;
an installation cavity matched with the oil outlet valve core 3 is arranged on the upper end surface of the oil outlet valve seat 2; an annular bulge 2-1 is arranged on the inner wall of the middle part of the installation cavity, and a conical surface is arranged at the upper port of the annular bulge 2-1; the bottom of the mounting cavity is provided with a third groove 2-2, and the side wall of the lower part of the third groove 2-2 is provided with an oil inlet hole 2-3 which is radially communicated with the outside; the bottom of the mounting cavity is provided with a plurality of connecting holes 2-4, the connecting holes 2-4 are used for communicating the bottom of the mounting cavity with the lower end face of the oil outlet valve seat 2, and the connecting holes 2-4 and the oil inlet holes 2-3 are arranged in a staggered mode;
a second limiting column 3-1 is formed at the upper part of the oil outlet valve core 3, the diameter of the second limiting column 3-1 is matched with the inner diameter of the oil outlet valve spring 4, a convex ring is arranged at the middle part of the oil outlet valve core 3, a contact surface is formed at the junction of the second limiting column 3-1 and the convex ring, and a sealing surface is formed at the lower side surface of the convex ring; the diameter of the lower part of the oil outlet valve core 3 is matched with the inner diameter of the annular bulge 2-1, a plurality of planes are milled on the outer wall of the lower part of the oil outlet valve core 3, and the planes are communicated with the lower end surface of the oil outlet valve core 3; an oil inlet valve cavity is arranged on the lower end face of the oil outlet valve core 3, a plurality of radial holes 3-2 are arranged on the plane, and the plane is communicated with the oil inlet valve cavity through the radial holes 3-2;
the diameter of the upper part of the oil inlet valve seat 5 is matched with the inner diameter of the oil inlet valve spring 6, the diameter of the middle part of the oil inlet valve seat 5 is matched with the inner diameter of the oil inlet valve cavity, a first step is formed at the junction of the upper part and the middle part of the oil inlet valve seat 5, the outer diameter of the lower part of the oil inlet valve seat 5 is larger than the diameter of the third groove 2-2, and a second step is formed at the junction of the middle part and the lower part of the oil inlet valve seat 5;
the lower end face of the pressing sleeve 1 is in contact with the upper end face of the oil outlet valve seat 2, and the second groove 1-2 is coaxially communicated with the mounting cavity; the lower part of the oil outlet valve core 3 is sleeved in the annular bulge 2-1, and the second limiting column 3-1 is coaxially opposite to the first limiting column 1-3; when the sealing surface is contacted with the conical surface, the cavities on the upper side and the lower side of the conical surface are mutually isolated; when the sealing surface is contacted with the conical surface, a gap is reserved between the second limiting column 3-1 and the first limiting column 1-3; when the sealing surface is not contacted with the conical surface, the upper side and the lower side of the annular bulge 2-1 can be communicated through the plane; the upper part of the oil outlet valve spring 4 is sleeved on the first limiting column 1-3, the upper end of the oil outlet valve spring 4 is contacted with the bottom surface of the second groove 1-2, the lower part of the oil outlet valve spring 4 is sleeved on the second limiting column 3-1, the lower end of the oil outlet valve spring 4 is contacted with the contact surface, and the oil outlet valve spring 4 is in a compressed state; the upper part and the middle part of the oil inlet valve seat 5 are sleeved in the oil inlet valve cavity, the lower part of the oil inlet valve spring 6 is sleeved on the upper part of the oil inlet valve seat 5, the lower end of the oil inlet valve spring 6 is contacted with the first step, the upper end of the oil inlet valve spring 6 is contacted with the bottom surface of the oil inlet valve cavity, the oil inlet valve spring 6 is in a compressed state, and when the lower end surface of the oil inlet valve seat 5 is contacted with the bottom surface of the mounting cavity, the port of the third groove 2-2 is closed; when the lower end face of the oil inlet valve seat 5 is contacted with the bottom surface of the mounting cavity, a gap is reserved between the second step and the lower end face of the oil outlet valve core 3; when the second step is contacted with the lower end face of the oil outlet valve core 3, a gap is reserved between the upper end face of the oil inlet valve seat 5 and the bottom face of the oil inlet valve cavity; the oil inlet valve cavity and the plane can be communicated all the time through the radial hole 3-2.
Claims (1)
1. The utility model provides an business turn over oil control mechanism for high pressure common rail system which characterized in that: the oil inlet and outlet control mechanism consists of a pressing sleeve (1), an oil outlet valve seat (2), an oil outlet valve core (3), an oil outlet valve spring (4), an oil inlet valve seat (5) and an oil inlet valve spring (6);
a first groove (1-1) is formed in the upper end face of the pressing sleeve (1), a second groove (1-2) is formed in the lower end face of the pressing sleeve (1), a first limiting column (1-3) is arranged on the bottom face of the second groove (1-2), a plurality of communicating holes (1-4) are formed between the bottom face of the first groove (1-1) and the bottom face of the second groove (1-2), the lower end ports of the communicating holes (1-4) and the first limiting column (1-3) are arranged in a staggered mode, the distance between the lower end ports of the communicating holes (1-4) and the first limiting column (1-3) is larger than the line diameter of the oil outlet valve spring (4), and the inner diameter of the oil outlet valve spring (4) is matched with the first limiting column (1-3);
an installation cavity matched with the oil outlet valve core (3) is arranged on the upper end surface of the oil outlet valve seat (2); an annular bulge (2-1) is arranged on the inner wall of the middle part of the installation cavity, and a conical surface is arranged at the upper port of the annular bulge (2-1); a third groove (2-2) is formed in the bottom of the mounting cavity, and an oil inlet hole (2-3) communicated with the outside in the radial direction is formed in the side wall of the lower portion of the third groove (2-2); the bottom of the mounting cavity is provided with a plurality of connecting holes (2-4), the connecting holes (2-4) are used for communicating the bottom of the mounting cavity with the lower end face of the oil outlet valve seat (2), and the connecting holes (2-4) and the oil inlet holes (2-3) are arranged in a staggered mode;
a second limiting column (3-1) is formed at the upper part of the oil outlet valve core (3), the diameter of the second limiting column (3-1) is matched with the inner diameter of the oil outlet valve spring (4), a convex ring is arranged at the middle part of the oil outlet valve core (3), a contact surface is formed at the junction of the second limiting column (3-1) and the convex ring, and a sealing surface is formed at the lower side surface of the convex ring; the diameter of the lower part of the oil outlet valve core (3) is matched with the inner diameter of the annular bulge (2-1), a plurality of planes are milled on the outer wall of the lower part of the oil outlet valve core (3), and the planes are communicated with the lower end face of the oil outlet valve core (3); an oil inlet valve cavity is arranged on the lower end face of the oil outlet valve core (3), a plurality of radial holes (3-2) are formed in the plane, and the plane is communicated with the oil inlet valve cavity through the radial holes (3-2);
the diameter of the upper part of the oil inlet valve seat (5) is matched with the inner diameter of the oil inlet valve spring (6), the diameter of the middle part of the oil inlet valve seat (5) is matched with the inner diameter of the oil inlet valve cavity, a first step is formed at the junction of the upper part and the middle part of the oil inlet valve seat (5), the outer diameter of the lower part of the oil inlet valve seat (5) is larger than the diameter of the third groove (2-2), and a second step is formed at the junction of the middle part and the lower part of the oil inlet valve seat (5);
the lower end face of the pressing sleeve (1) is in contact with the upper end face of the oil outlet valve seat (2), and the second groove (1-2) is coaxially communicated with the mounting cavity; the lower part of the oil outlet valve core (3) is sleeved in the annular bulge (2-1), and the second limiting column (3-1) is coaxially opposite to the first limiting column (1-3); when the sealing surface is contacted with the conical surface, the cavities on the upper side and the lower side of the conical surface are mutually isolated; when the sealing surface is contacted with the conical surface, a gap is reserved between the second limiting column (3-1) and the first limiting column (1-3); when the sealing surface is not contacted with the conical surface, the upper side and the lower side of the annular bulge (2-1) can be communicated through the plane; the upper part of the oil outlet valve spring (4) is sleeved on the first limiting column (1-3), the upper end of the oil outlet valve spring (4) is contacted with the bottom surface of the second groove (1-2), the lower part of the oil outlet valve spring (4) is sleeved on the second limiting column (3-1), the lower end of the oil outlet valve spring (4) is contacted with the contact surface, and the oil outlet valve spring (4) is in a compressed state; the upper part and the middle part of the oil inlet valve seat (5) are sleeved in the oil inlet valve cavity, the lower part of the oil inlet valve spring (6) is sleeved on the upper part of the oil inlet valve seat (5), the lower end of the oil inlet valve spring (6) is contacted with the first step, the upper end of the oil inlet valve spring (6) is contacted with the bottom surface of the oil inlet valve cavity, the oil inlet valve spring (6) is in a compressed state, and when the lower end surface of the oil inlet valve seat (5) is contacted with the bottom surface of the mounting cavity, the port of the third groove (2-2) is closed; when the lower end face of the oil inlet valve seat (5) is contacted with the bottom surface of the mounting cavity, a gap is reserved between the second step and the lower end face of the oil outlet valve core (3); when the second step is contacted with the lower end face of the oil outlet valve core (3), a gap is reserved between the upper end face of the oil inlet valve seat (5) and the bottom face of the oil inlet valve cavity; the oil inlet valve cavity and the plane can be communicated all the time through a radial hole (3-2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121114502.9U CN214660575U (en) | 2021-05-24 | 2021-05-24 | Oil inlet and outlet control mechanism for high-pressure common rail system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121114502.9U CN214660575U (en) | 2021-05-24 | 2021-05-24 | Oil inlet and outlet control mechanism for high-pressure common rail system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214660575U true CN214660575U (en) | 2021-11-09 |
Family
ID=78495807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121114502.9U Withdrawn - After Issue CN214660575U (en) | 2021-05-24 | 2021-05-24 | Oil inlet and outlet control mechanism for high-pressure common rail system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214660575U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113123908A (en) * | 2021-05-24 | 2021-07-16 | 中国重汽集团重庆燃油喷射系统有限公司 | Oil inlet and outlet control mechanism for high-pressure common rail system |
-
2021
- 2021-05-24 CN CN202121114502.9U patent/CN214660575U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113123908A (en) * | 2021-05-24 | 2021-07-16 | 中国重汽集团重庆燃油喷射系统有限公司 | Oil inlet and outlet control mechanism for high-pressure common rail system |
| CN113123908B (en) * | 2021-05-24 | 2023-12-26 | 重油高科电控燃油喷射系统有限公司 | Oil inlet and outlet control mechanism for high-pressure common rail system |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 401120 No.6 cuining Road, jingkaiyuan, Liangjiang New District, Yubei District, Chongqing Patentee after: Heavy oil high tech electronic fuel injection system (Chongqing) Co.,Ltd. Address before: 401120 No.6 cuining Road, jingkaiyuan, Liangjiang New District, Yubei District, Chongqing Patentee before: CHONGQING FUEL INJECTION SYSTEM CO., LTD. OF CHINA NATIONAL HEAVY DUTY TRUCK Group Corp. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 401120 No.6 cuining Road, jingkaiyuan, Liangjiang New District, Yubei District, Chongqing Patentee after: Heavy Oil High Tech Electronic Fuel Injection System Co.,Ltd. Address before: 401120 No.6 cuining Road, jingkaiyuan, Liangjiang New District, Yubei District, Chongqing Patentee before: Heavy oil high tech electronic fuel injection system (Chongqing) Co.,Ltd. |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20211109 Effective date of abandoning: 20231226 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20211109 Effective date of abandoning: 20231226 |