CN114542321A - Sealing structure of eccentric shaft position sensor - Google Patents
Sealing structure of eccentric shaft position sensor Download PDFInfo
- Publication number
- CN114542321A CN114542321A CN202011351669.7A CN202011351669A CN114542321A CN 114542321 A CN114542321 A CN 114542321A CN 202011351669 A CN202011351669 A CN 202011351669A CN 114542321 A CN114542321 A CN 114542321A
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- sealing
- eccentric shaft
- sealing ring
- position sensor
- shaft position
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- 238000007789 sealing Methods 0.000 title claims abstract description 132
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 230000006835 compression Effects 0.000 description 13
- 238000007906 compression Methods 0.000 description 13
- 230000007246 mechanism Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F11/00—Arrangements of sealings in combustion engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gasket Seals (AREA)
Abstract
The invention provides a sealing structure of an eccentric shaft position sensor, wherein the eccentric shaft position sensor is arranged opposite to one end of an eccentric shaft and at least provided with a fixing part which penetrates through an oil pan and is fastened on a cylinder bearing block for bearing the eccentric shaft, the sealing structure comprises a sealing ring sleeved on the fixing part, a groove which is circumferentially arranged with the sealing ring is formed on the outer circumferential surface of the sealing ring, the oil pan is embedded in the groove, and along with the fastening of the fixing part, the two side end surfaces of the sealing ring are clamped between the fixing part and the cylinder bearing block, so that the sealing among the fixing part, the oil pan and the cylinder bearing block is formed. The sealing structure changes the sealing form of the sealing ring from radial sealing to end surface sealing, and can overcome the defects of the existing radial sealing form.
Description
Technical Field
The invention relates to the technical field of variable compression ratio engines, in particular to a sealing structure of an eccentric shaft position sensor.
Background
In order to reduce the engine displacement and improve the fuel combustion efficiency and the fuel economy, a variable compression ratio technology is developed. Along with the continuous development of variable compression ratio technique, its adjustment mechanism form is more and more diversified, and wherein, eccentric shaft position sensor plays the effect of real-time detection eccentric shaft angular position in variable compression ratio mechanism, and in the design, both can accurate detection eccentric shaft position angle, will guarantee assembly convenience and better leakproofness again.
In the existing structure, the eccentric shaft position sensor generally adopts the radial seal of a seal ring, the requirement of the sealing mode on the coaxiality of parts is high, and once the coaxiality deviation is large, the eccentric compression ratio of the seal ring is overlarge, so that the seal failure is caused. In addition, the requirement on the coaxiality between the rotor and the stator of the eccentric shaft position sensor is higher, meanwhile, the sensor needs to be positioned in an increased mode during assembly, if the sensor is used for positioning and sealing in the radial direction, and if the position degree or the coaxiality are out of tolerance, the problem that the sensor is difficult to assemble or sealing fails also exists.
Disclosure of Invention
In view of the above, the present invention is directed to a sealing structure of an eccentric shaft position sensor, which can overcome the disadvantages of the existing radial sealing form.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a sealing structure of an eccentric shaft position sensor is provided, the eccentric shaft position sensor is arranged opposite to one end of an eccentric shaft and at least provided with a fixing part which penetrates through an oil pan and is fastened on a cylinder body bearing block bearing the eccentric shaft, the sealing structure comprises a sealing ring sleeved on the fixing part, a groove with a ring arranged circumferentially is formed on the outer peripheral surface of the sealing ring, the oil pan is embedded in the groove, and along with the fastening of the fixing part, the end surfaces of two sides of the sealing ring are clamped between the fixing part and the cylinder body bearing block, so that the sealing among the fixing part, the oil pan and the cylinder body bearing block is formed.
Furthermore, a sealing bulge which is arranged circumferentially around the sealing ring is arranged on at least one side end face of the sealing ring.
Further, the sealing bulges are at least two arranged at intervals along the radial direction of the sealing ring.
Furthermore, the sealing bulges are arranged on the end faces of the two sides of the sealing ring, and the sealing bulges on the two sides are arranged in a staggered mode.
Furthermore, the gaps between the adjacent sealing bulges at the two sides are not consistent, and the sealing bulges at the two sides have a common symmetrical central plane on the cross section of the sealing ring.
Further, the fixing portion is provided with a flange, the flange forms clamping on the side end face of the sealing ring along with the fastening of the fixing portion, and one side of the sealing ring, with a smaller gap, between the adjacent sealing protrusions is abutted to the flange.
Further, the width of the groove is larger than the thickness of the oil bottom shell part embedded in the groove.
Furthermore, the fixed part is provided with an annular spigot which is embedded in the cylinder body bearing seat, the sealing ring and the fixed part and the spigot and the cylinder body bearing seat are in clearance fit, and the clearance between the sealing ring and the fixed part is larger than the clearance between the spigot and the cylinder body bearing seat.
Further, the fixing part is fixedly connected with the cylinder bearing seat through a fastener penetrating into the fixing part.
Further, the eccentric shaft position sensor includes a sensor stator and a sensor rotor, the sensor rotor is press-fitted to an end portion of the eccentric shaft, and the sensor stator constitutes the fixed portion.
Compared with the prior art, the invention has the following advantages:
the sealing structure of the eccentric shaft position sensor is fastened along with the fixing part, and the end faces of the two sides of the sealing ring are clamped between the fixing part and the cylinder body bearing seat, so that the sealing among the fixing part, the oil pan and the cylinder body bearing seat is formed, the sealing form of the sealing ring can be changed from radial sealing into end face sealing, and the radial direction of the sensor is only used for positioning, so that the defects of the existing radial sealing form can be overcome.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of an eccentric shaft position sensor and a sealing structure according to an embodiment of the present invention;
FIG. 2 is a schematic layout of an eccentric shaft position sensor and seal structure according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a stator of a sensor according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a seal ring according to an embodiment of the present invention;
FIG. 5 is a partial enlarged view of portion A of FIG. 4;
FIG. 6 is a front view of a seal ring according to an embodiment of the present invention;
FIG. 7 is a cross-sectional view of a seal ring according to an embodiment of the present invention;
FIG. 8 is a schematic view of a sealing protrusion according to an embodiment of the present invention;
description of reference numerals:
1. a seal ring; 2. a sensor rotor; 3. a sensor stator; 4. an eccentric shaft; 5. an oil pan; 6. a cylinder block bearing seat; 7. a fastener;
101. a groove; 102. sealing the protrusion; 103. a connecting projection;
301. a mounting surface; 302. a flange; 303. stopping the opening; 304. and (7) fixing holes.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inside", "outside", etc. appear, they are based on the orientation or positional relationship shown in the drawings and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same item, but are instead intended to cover the same item.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The present embodiment relates to a sealing structure of an eccentric shaft position sensor for detecting the angular position of an eccentric shaft 4 in a variable compression ratio mechanism (VCR) as an important measurement basis of the amount of adjustment of the mechanism during the adjustment of the compression ratio. The variable compression ratio mechanism, as described above, in the present embodiment, generally refers to a multi-link type variable compression ratio mechanism that employs the eccentric shaft 4 and a multi-link mechanism drivingly connected between the eccentric shaft 4 and a piston.
In a common embodiment, the eccentric shaft 4 is driven by a motor through a speed reducer, when the compression ratio needs to be adjusted, the motor drives the eccentric shaft 4 to rotate, the rotation of the eccentric shaft 4 is transmitted to the piston through a multi-connecting-rod mechanism, so that the top dead center of the piston is changed, and the adjustment of the compression ratio is realized. In the whole adjustment process, the eccentric shaft position sensor detects the angle position of the eccentric shaft 4 in real time and feeds the angle position back to the controller, and the controller adjusts the rotation of the motor according to a detection signal so as to realize closed-loop control.
Based on the above description of the variable compression ratio mechanism, specifically, referring to fig. 1 and 2, the eccentric shaft position sensor in the present embodiment is disposed just opposite to one end of the eccentric shaft 4, and has at least a fixed portion that is pierced through the oil pan 5 and fastened to the cylinder bearing block 6 that carries the eccentric shaft 4. The sealing structure includes a sealing ring 1 sleeved on the fixing portion, and a groove 101 circumferentially arranged around the sealing ring 1 is formed on the outer circumferential surface of the sealing ring 1. The oil pan 5 is embedded in the groove 101, and along with the fastening between the fixed part and the cylinder bearing seat 6, the two side end faces of the sealing ring 1 are clamped between the fixed part and the cylinder bearing seat 6, thereby forming the sealing among the fixed part, the oil pan 5 and the cylinder bearing seat 6.
As an exemplary structure of the eccentric shaft position sensor of the present embodiment, it specifically includes a sensor stator 3 and a sensor rotor 2, the sensor rotor 2 is press-fitted to an end portion of the eccentric shaft 4 as shown in fig. 2, and the sensor stator 3 constitutes the above-described fixed portion. Also in this case, the eccentric shaft position sensor, which is formed by the sensor stator 3 and the sensor rotor 2, is sufficient, as is also the case with the known angle sensor products comprising a rotor part and a stator part.
In the present embodiment, as shown in fig. 3, for the sensor stator 3 constituting the fixing portion, as an exemplary embodiment, the sealing ring 1 is specifically fitted on an annular mounting surface 301 on the sensor stator 3, and a radially outward flange 302 is also provided thereon at one end, and the flange 302 is specifically used for constituting a clamping of a side end surface of the sealing ring 1 along with the fastening between the sensor stator 3 and the cylinder bearing seat 6, thereby realizing a sealing function of the sealing ring 1.
The sensor stator 3 further has an annular spigot 303 that is fitted into the cylinder bearing 6, and the spigot 303 is used to position the sensor stator 3 when the sensor stator 3 is connected to the cylinder bearing 6. It should be noted that, in the embodiment, when the spigot 303 is provided, clearance fits are respectively provided between the seal ring 1 and the sensor stator 3, specifically between the seal ring 1 and the mounting surface 301, and between the spigot 303 and the cylinder bearing seat 6, wherein a clearance between the seal ring 1 and the mounting surface 301 is also larger than a clearance between the spigot 303 and the cylinder bearing seat 6.
By making the clearance between the seal ring 1 and the mounting surface 301 larger, the present embodiment can avoid the situation that the sensor stator 3 radially compresses the seal ring 1 to cause difficulty in assembly after the spigot 303 is matched with the cylinder bearing seat 6. The gap between the seal ring 1 and the mounting surface 301 and the gap between the spigot 303 and the cylinder bearing seat 6 may be selected as appropriate in specific implementation.
In this embodiment, the sensor stator 3 is fastened to the cylinder bearing seat 6 by a fastening member 7 inserted into the sensor stator 3, and at this time, a through fixing hole 304 is opened on the sensor stator 3, and the fastening member 7 may generally be a bolt with a gasket, and the bolt is inserted through the fixing hole 304 and screwed and fastened to the cylinder bearing seat 6.
As shown in fig. 4 to 7, which are schematic structural diagrams of the sealing ring 1 of the present embodiment, the groove 101 is formed in the middle of the axial thickness of the sealing ring 1, and in order to achieve the embedding of the oil pan 5 in the groove 101, specifically, a through hole is formed in the oil pan 5 at a position corresponding to the end of the eccentric shaft 4, the edge of the through hole is embedded in the groove 101, and the sensor stator 3 constituting the fixing portion is inserted into the through hole.
In order to facilitate the assembly of the sealing ring 1, the present embodiment also provides, as a preferred embodiment, that the width of the groove 101 is greater than the thickness of the portion of the oil pan 5 that is embedded in the groove 101, i.e., the thickness of the edge portion of the through hole is less than the width of the groove 101 of the sealing ring 1, and this width refers to the width in the axial direction of the sealing ring 1. In addition, in order to improve the sealing effect, in the present embodiment, further, a sealing protrusion 102 arranged circumferentially around the ring sealing ring 1 is also provided on at least one side end surface of the sealing ring 1.
At this time, as a preferable example, the sealing protrusions 102 on each side may be provided in two or more numbers arranged at intervals in the radial direction of the seal ring 1, and the sealing protrusions 102 are also provided on both side end faces of the seal ring 1. When the sealing protrusions 102 are distributed on the end surfaces of the two sides, in order to make the stress on the sealing ring 1 uniform and better ensure the sealing effect, the sealing protrusions 102 on the two sides are also preferably arranged in a staggered manner as shown in fig. 8.
Meanwhile, in addition to the offset arrangement, the present embodiment may also be configured such that the gaps between the adjacent sealing protrusions 102 on both sides are not uniform, that is, as shown in fig. 8, the gaps a and the gaps b between the sealing protrusions 102 on both side end faces are not equal. However, although the sealing protrusions 102 on the two side end surfaces are arranged in a staggered manner and the gaps between the adjacent sealing protrusions 102 are different, referring to fig. 8, the sealing protrusions 102 on the two sides of the cross section of the sealing ring 1 in the present embodiment have a common symmetrical center plane L.
The sealing protrusions 102 on the two sides are symmetrical relative to the symmetrical center plane L, so that the uniform stress of the sealing ring 1 can be further ensured, and the sealing effect of the sealing ring can be further ensured. In addition, when the above arrangement is adopted for the sealing protrusions 102 on both sides, the present embodiment also makes the side of the sealing ring 1 where the gap between the adjacent sealing protrusions 102 is small abut against the flange 302 in the sensor stator 3. At this time, the small gap between the side sealing protrusions 102 can reduce the diameter of the flange 302, thereby avoiding the problems of compression failure due to excessive root stress, oil leakage, and the like.
When the sealing structure of the eccentric shaft position sensor of the embodiment is assembled, the sealing ring 1 is firstly installed in the through hole on the oil pan 5 through the groove 101, then the oil pan 5 is assembled to the cylinder body from bottom to top, then the sensor rotor 2 is pressed to the end part of the eccentric shaft 4, then the sensor stator 3 passes through the sealing ring 1, and after being positioned through the spigot 303, the fastening piece 7 passes through the fixing hole 304 and is fastened to the cylinder bearing seat 6. In the fastening process, the flange 302 of the sensor stator 3 firstly compresses the gap between the groove 101 and the oil pan 5, and then compresses the gaps between the sealing protrusions 102 on the two sides and the flange 302 and the cylinder bearing seat 6, and finally the assembly is completed.
The seal structure of this embodiment, through the fastening along with sensor stator 3, the both sides terminal surface of sealing washer 1 is pressed from both sides tightly between flange 302 and cylinder body bearing frame 6 to constitute sensor stator 3, oil pan 5 and the sealed between the 6 three of cylinder body bearing frame, can change the sealed form of sealing washer 1 into end face seal by radial seal from this, and the sensor is radial only to be used for doing the positioning action, thereby can overcome the not enough of current radial seal form, with fine practicality.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (10)
1. A sealing structure of an eccentric shaft position sensor is characterized in that: the eccentric shaft position sensor is arranged right opposite to one end of the eccentric shaft (4) and at least provided with a fixing part which penetrates through an oil pan (5) and is fastened on a cylinder body bearing seat (6) for bearing the eccentric shaft (4), the sealing structure comprises a sealing ring (1) sleeved on the fixing part, a groove (101) which is circumferentially arranged around the sealing ring (1) is formed in the outer circumferential surface of the sealing ring (1), the oil pan (5) is embedded in the groove (101) and is fastened along with the fixing part, and two side end faces of the sealing ring (1) are clamped between the fixing part and the cylinder body bearing seat (6) to form sealing among the fixing part, the oil pan (5) and the cylinder body bearing seat (6).
2. The sealing structure of the eccentric shaft position sensor according to claim 1, wherein: and a sealing bulge (102) which is arranged around the sealing ring (1) in the circumferential direction is arranged on at least one side end surface of the sealing ring (1).
3. The sealing structure of the eccentric shaft position sensor according to claim 2, wherein: the sealing bulges (102) are at least two arranged at intervals along the radial direction of the sealing ring (1).
4. The sealing structure of the eccentric shaft position sensor according to claim 3, wherein: the sealing protrusions (102) are arranged on the end faces of the two sides of the sealing ring (1), and the sealing protrusions (102) on the two sides are arranged in a staggered mode.
5. The sealing structure of the eccentric shaft position sensor according to claim 4, wherein: gaps between adjacent sealing bulges (102) on two sides are not consistent, and on the cross section of the sealing ring (1), the sealing bulges (102) on two sides have a common symmetrical central plane.
6. The sealing structure of the eccentric shaft position sensor according to claim 5, wherein: the fixing part is provided with a flange (302), the flange (302) forms clamping on the side end face of the sealing ring (1) along with the fastening of the fixing part, and the side with smaller gap between the adjacent sealing bulges (102) of the sealing ring (1) is abutted with the flange (302).
7. The sealing structure of the eccentric shaft position sensor according to claim 1, wherein: the width of the groove (101) is larger than the thickness of the oil pan (5) portion embedded in the groove (101).
8. The sealing structure of the eccentric shaft position sensor according to claim 1, wherein: the fixed part is provided with an annular spigot (303) embedded in the cylinder body bearing seat (6), the sealing ring (1) and the fixed part are in clearance fit, and the spigot (303) and the cylinder body bearing seat (6) are in clearance fit, and the clearance between the sealing ring (1) and the fixed part is larger than the clearance between the spigot (303) and the cylinder body bearing seat (6).
9. The sealing structure of the eccentric shaft position sensor according to claim 1, wherein: the fixed part is fixedly connected with the cylinder bearing seat (6) through a fastener (7) penetrating into the fixed part.
10. The sealing structure of the eccentric shaft position sensor according to any one of claims 1 to 9, characterized in that: the eccentric shaft position sensor comprises a sensor stator (3) and a sensor rotor (2), the sensor rotor (2) is pressed on the end part of the eccentric shaft (4), and the sensor stator (3) forms the fixed part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011351669.7A CN114542321B (en) | 2020-11-26 | 2020-11-26 | Sealing structure of eccentric shaft position sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011351669.7A CN114542321B (en) | 2020-11-26 | 2020-11-26 | Sealing structure of eccentric shaft position sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114542321A true CN114542321A (en) | 2022-05-27 |
| CN114542321B CN114542321B (en) | 2023-03-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011351669.7A Active CN114542321B (en) | 2020-11-26 | 2020-11-26 | Sealing structure of eccentric shaft position sensor |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060290073A1 (en) * | 2005-06-27 | 2006-12-28 | Freudenberg-Nok General Partnership | Insertable carrier for multiple piece gasket designs that limit compression |
| US20070017282A1 (en) * | 2005-07-25 | 2007-01-25 | Nissan Motor Co., Ltd. | Cam angle sensor mounting structure |
| CN206468457U (en) * | 2016-12-10 | 2017-09-05 | 阜新申泰汽车部件有限公司 | Automobile engine back oil seal cover |
| CN206539416U (en) * | 2017-02-17 | 2017-10-03 | 广西玉柴机器股份有限公司 | A kind of integrated form gear chamber cover |
| CN207513649U (en) * | 2017-12-07 | 2018-06-19 | 广西玉柴机器股份有限公司 | Multi-functional front oil seal seat |
| CN109611235A (en) * | 2019-01-17 | 2019-04-12 | 上海汽车集团股份有限公司 | Engine rear end sealing device |
| CN209414002U (en) * | 2018-11-02 | 2019-09-20 | 北汽福田汽车股份有限公司 | The sealing structure of cylinder body, engine cylinder body and sealing device when engine assembly |
-
2020
- 2020-11-26 CN CN202011351669.7A patent/CN114542321B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060290073A1 (en) * | 2005-06-27 | 2006-12-28 | Freudenberg-Nok General Partnership | Insertable carrier for multiple piece gasket designs that limit compression |
| US20070017282A1 (en) * | 2005-07-25 | 2007-01-25 | Nissan Motor Co., Ltd. | Cam angle sensor mounting structure |
| CN1904332A (en) * | 2005-07-25 | 2007-01-31 | 日产自动车株式会社 | Mounting structure for cam angle sensor of internal-combustion engine |
| CN206468457U (en) * | 2016-12-10 | 2017-09-05 | 阜新申泰汽车部件有限公司 | Automobile engine back oil seal cover |
| CN206539416U (en) * | 2017-02-17 | 2017-10-03 | 广西玉柴机器股份有限公司 | A kind of integrated form gear chamber cover |
| CN207513649U (en) * | 2017-12-07 | 2018-06-19 | 广西玉柴机器股份有限公司 | Multi-functional front oil seal seat |
| CN209414002U (en) * | 2018-11-02 | 2019-09-20 | 北汽福田汽车股份有限公司 | The sealing structure of cylinder body, engine cylinder body and sealing device when engine assembly |
| CN109611235A (en) * | 2019-01-17 | 2019-04-12 | 上海汽车集团股份有限公司 | Engine rear end sealing device |
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| Publication number | Publication date |
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| CN114542321B (en) | 2023-03-21 |
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