CN112943402A - Variable valve timing electric phase modulation transmission device - Google Patents
Variable valve timing electric phase modulation transmission device Download PDFInfo
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- CN112943402A CN112943402A CN202110349572.0A CN202110349572A CN112943402A CN 112943402 A CN112943402 A CN 112943402A CN 202110349572 A CN202110349572 A CN 202110349572A CN 112943402 A CN112943402 A CN 112943402A
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- Prior art keywords
- gear ring
- inner gear
- variable valve
- valve timing
- eccentric shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
Abstract
The invention discloses a variable valve timing electric phase modulation transmission device, which comprises: a camshaft; a center bolt connected with a first end of the camshaft; one side of the output inner gear ring is fixed on the camshaft, the other end of the output inner gear ring is sleeved on the first end of the support sleeve, and the output inner gear ring is provided with inner teeth; the eccentric shaft is rotatably sleeved on the support sleeve through a small needle bearing; the planet gear is rotatably sleeved on the eccentric shaft, and is provided with an external large tooth part and an external small tooth part, and the small tooth part is meshed with the inner tooth of the output inner gear ring; the input inner gear ring is sleeved on the sprocket wheel and is meshed with the large gear part of the planet wheel; the chain wheel is sleeved on the outer side of the output inner gear ring; and the driving mechanism can drive the eccentric shaft to rotate. The radial arrangement of the two needle roller bearings not only can reduce the axial size and weight, but also can improve the efficiency of the phase adjusting device, simultaneously can reduce the working noise of the phase adjusting device and prolong the service life.
Description
Technical Field
The invention belongs to the technical field of internal combustion engine parts, and particularly relates to a variable valve timing electric phase modulation transmission device.
Background
The internal combustion engine is used as the power machine with highest thermal efficiency and most extensive application at present, the total power generated by the internal combustion engine accounts for 90 percent of the total power of power devices used all over the world, and the internal combustion engine is a main consumption channel of petroleum energy in the world. With the increase of the quantity of automobiles, the petroleum consumption of the internal combustion engine is rapidly increased, the contradiction between supply and demand of petroleum is inevitably serious day by day, and the internal combustion engine is the largest source of atmospheric environment pollution, particularly urban atmospheric environment pollution, while a large amount of energy is consumed, so that the technology of innovating the internal combustion engine is significant for saving energy and reducing environmental pollution. On the other hand, with the stricter emission regulations of countries around the world, low emission and environmental protection become the precondition for the engine to enter the market, and become the important subject of the automobile industry at present.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:
in the traditional internal combustion engine, the valve opening time is fixed and unchanged, so that no matter under a large load or a small load working condition, the valve opening time is the same, energy waste is caused, and the heat efficiency is low.
The conventional hydraulically driven variable timing phase mechanism. While in operation. At low speed, phase modulation cannot be achieved. High speed phase modulation is slow and not accurate enough. In the existing electric variable timing mechanism, the weight and the size are larger, or the single-stage speed ratio is small (about 60).
Disclosure of Invention
The invention aims to solve the technical problem of providing a variable valve timing electric phase modulation transmission device which can not only reduce the axial size and weight, but also realize two-stage speed reduction and large speed ratio so as to reduce the power of a motor.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a variable valve timing electric phasing transmission device is provided with:
a camshaft;
a center bolt connected with a first end of the camshaft;
the output inner gear ring is fixedly sleeved on one side of the cam shaft and is provided with an inner gear ring;
the support sleeve is fixedly arranged on the output inner gear ring;
the eccentric shaft is rotatably sleeved on the support sleeve through a small needle bearing;
the planet gear is rotatably sleeved on the eccentric shaft, a large tooth part and a small tooth part are arranged on the planet gear, and the small tooth part is meshed with the inner gear ring of the output inner gear ring;
the input inner gear ring is sleeved on the planet gear, and an inner tooth part of the input inner gear ring is meshed with a large tooth part of the planet gear;
the chain wheel is fixedly connected with the input inner gear ring and radially sleeved outside the output inner gear ring;
and the driving mechanism can drive the eccentric shaft to rotate.
The driving mechanism comprises a motor, a motor shifting block and a spacer bush, the spacer bush is fixedly connected with the eccentric shaft, the motor shifting block is connected with a rotating shaft of the motor, and the motor shifting block can be matched with the spacer bush.
The planet wheel is rotatably arranged on the eccentric shaft through a large needle bearing.
The spacer bush is a plastic spacer bush.
The chain wheel is provided with a cavity, and the output inner gear ring is installed in the cavity of the chain wheel.
The input inner gear ring is matched with the chain wheel through a step surface, and the input inner gear ring is fixedly connected with the chain wheel through a bolt.
The bottom surface and the outer peripheral surface of the output inner gear ring are matched with the bottom surface and the inner peripheral surface of the chain wheel; and two sides of the large tooth part of the planet gear are in clearance fit with the end surfaces between the output inner gear ring and the input inner gear ring.
The central bolt is in threaded connection with the camshaft.
One of the above technical solutions has the following advantages or beneficial effects that the two needle roller bearings are radially arranged, so that not only can the axial size and weight be reduced, but also the efficiency of the phase adjusting device can be improved, meanwhile, the working noise of the phase adjusting device can be reduced, and the service life is prolonged.
Drawings
FIG. 1 is a schematic diagram of a variable valve timing electro-dynamic phasing transmission provided in an embodiment of the invention;
FIG. 2 is a drive schematic of the variable valve timing electro-phasing transmission of FIG. 1;
FIG. 3 is a schematic diagram of the reception of the variable valve timing electro-phasing transmission of FIG. 1;
FIG. 4 is a schematic diagram of the plastic spacer of the variable valve timing electro-dynamic phasing transmission of FIG. 1;
FIG. 5 is a schematic view of a combination positioning arrangement of the variable valve timing electro-phasing transmission of FIG. 1;
FIG. 6 is a schematic diagram of the variable valve timing electro-phasing transmission of FIG. 1;
FIG. 7 is a cross-sectional view C-C, D-D of FIG. 6;
FIG. 8 is an exploded schematic view of the variable valve timing electro-phasing transmission of FIG. 1;
FIG. 9 is a structural use of a support sleeve and an output ring gear of the variable valve timing electro-dynamic phasing transmission of FIG. 1;
the labels in the above figures are: 1. the device comprises an output inner gear ring, 2, a chain wheel, 3, an input inner gear ring, 4, a support sleeve, 5, a plastic spacer bush, 6, a small needle bearing, 7, an eccentric shaft, 8, a planet wheel, 9, a large needle bearing, 01, a camshaft, 02, a motor shifting block, 03, a motor, 04 and a bolt.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1-9, a variable valve timing electro-phasing transmission has:
a camshaft 01; installing an electric phaser body;
a coupling bolt 04 for fixing the electric phaser body and the camshaft 01;
the support sleeve 4 is sleeved in a central hole of the output inner gear ring 1 in the radial direction;
the eccentric shaft 7 is radially sleeved on the support sleeve 4 through a small needle bearing 6;
the output inner gear ring 1 is fixedly sleeved on the end face of the camshaft 01, and the inner gear ring is arranged in the output inner gear ring 1;
the planet wheel 8 is rotatably sleeved on the eccentric shaft 7, a large tooth part 801 and a small tooth part 802 are arranged on the planet wheel 8, and the small tooth part 802 is meshed with the inner teeth of the output inner gear ring 1;
the input inner gear ring 3 is sleeved on the chain wheel 2, and the input inner gear ring 3 is meshed with a large tooth part 801 of the planet wheel 8;
the chain wheel 2 is sleeved on the output inner gear ring 1, can freely rotate and is fixedly connected with the input inner gear ring 3 in the axial direction;
and a driving mechanism capable of driving the eccentric shaft 7 to rotate.
The driving mechanism comprises a motor 03, a motor shifting block 02 and a spacer 5, the spacer 5 is fixedly connected with an eccentric shaft 7, the motor shifting block 02 is connected with a rotating shaft of the motor 03, and the motor shifting block 02 can be matched with the spacer 5.
The eccentric shaft 7 is rotatably mounted on the support sleeve 4 through a small needle bearing 6. The planet wheel 8 is rotatably mounted on the eccentric shaft by a large needle bearing 9. Because two bearings are axially overlapped, the axial length is shortened compared with the conventional design, and the bearing is supported in a shape like a Chinese character 'shan', so that the vertical stress is more reasonable, as shown in figures 2 and 3. The supporting form is similar to a Chinese character 'shan', the output inner gear ring 1 and the supporting sleeve 4 support other parts together, and the stress is more reasonable.
The spacer bush is a plastic spacer bush 5. A plastic spacer 5 is arranged between the motor shifting block 02 and the eccentric shaft 7, so that direct contact between metal and metal is avoided, and friction noise is reduced, as shown in fig. 4.
The supporting sleeve 4 and the output inner gear ring 1 are separately designed, so that the output inner gear ring 1 can be manufactured in a powder metallurgy mode, and the part processing difficulty and cost are reduced. And meanwhile, the matching surface 1a and the matching surface 4a are required to be assembled and butted so as to ensure that the supporting sleeve 4 and the output ring gear 1 are concentric, as shown in figure 9.
A cavity is arranged on the chain wheel 2, and the output inner gear ring 1 is radially arranged in the cavity of the chain wheel 2.
The input inner gear ring 3 is matched with the chain wheel 2 through a step surface, and the input inner gear ring 3 is tightly connected with the chain wheel 2 through a bolt.
The center bolt 04 is screwed to the camshaft 01. The center bolt 04 serves as a tightening link between the reducer and the camshaft, and also serves as a support shaft for the bearing gear, reducing parts (as shown in fig. 1).
And (3) description in combination with positioning: as shown in fig. 5, the output ring gear 1 is clamped on the camshaft 01 through the support sleeve 4; the input inner gear ring 3 and the chain wheel 2 are ensured to be concentric through a d matching surface and are connected in a bolt fastening mode. The output inner gear ring 1 supports the chain wheel 2 through two matching surfaces of b and c, and simultaneously supports the input inner gear ring 3. The planet wheel 8 realizes axial small clearance fit through two fitting surfaces of e and f, and ensures that the planet wheel rotates freely and cannot incline too much.
The planet wheel 8 comprises a large tooth part 801 and a small tooth part 802, and the large tooth part 801 is meshed with the input inner gear ring 3 so as to transmit the power of the chain wheel 2 to the planet wheel 8; the other side small tooth part 802 of the planet wheel 8 is meshed with the output inner gear ring 1, so that power is transmitted to the camshaft 01.
The large needle bearing 9 is matched with an inner hole of the planet wheel 8 to play a role in supporting the planet wheel 8; the eccentric axis 104 and the central axis 105 do not coincide parallel to one another, wherein the large needle bearing 9 and the planet wheel 8 rotate about the eccentric axis and the small needle bearing 6 and the eccentric shaft 7 rotate about the central axis 105.
The specific transmission paths are as follows:
FIG. 1: the motor shifting block 02 shifts the plastic spacer 5 to drive the eccentric shaft 7;
FIGS. 6 and 7: the output inner gear ring 1 and the support sleeve 4 are fixedly connected to the camshaft 01 through a central bolt 04; the eccentric shaft 7 is shifted by the motor shifting block 02, and the motor power is transmitted into the speed reducer.
The chain wheel 2 and the engine crankshaft rotate in the same direction according to a fixed reduction ratio; the planet gear 8 is arranged in the output inner gear ring 1, and one end of the tooth part 801 is meshed with the input inner gear ring 3; the output inner gear ring 1 radially supports the chain wheel 2 and is rigidly connected with the camshaft 01 of the engine, the output inner gear ring 1 can rotate in a differential speed relative to the axis of the chain wheel 2 and is meshed with the tooth part 802 at the other end of the planet wheel 8; the support sleeve 4 is tightly matched with the output inner gear ring 1 and radially supports the planet wheel 8 and the eccentric shaft 7; the eccentric shaft 7 can eccentrically and differentially rotate around the axis of the chain wheel 2, and the eccentric shaft 7 radially supports the planet wheel 8; the motor shifting block 02 drives the eccentric shaft 7 to rotate; the planet wheels 8 perform complex planar motion around the eccentric shaft 7, and the power of the planet wheels is transmitted to the output inner gear ring 1 through the driving tooth part 802 of the planet wheels 8.
The motor shifting block 02 shifts the eccentric shaft 7, the eccentric shaft rotates under the support of the support sleeve 4, the outer diameter and the inner diameter of the eccentric shaft 7 are eccentrically arranged, when the eccentric shaft rotates for one circle, the large needle bearing 9 and the planet wheel 8 which are arranged on the outer side of the eccentric shaft deflect once, the large tooth 801 of the planet wheel meshes for one circle along the inner teeth of the output inner gear ring 3, and the small tooth 802 of the planet wheel meshes for one circle along the inner teeth of the output inner gear ring 1. Because the number of teeth of the large gear 801 and the small gear 802 of the planet gear is different, the number of teeth which are simultaneously meshed with the output inner gear ring 1 and the output inner gear ring 3 of the planet gear 8 rotate is different, and finally phase change is realized.
The phase angle of a camshaft of the internal combustion engine relative to a crankshaft is dynamically adjusted to adjust the opening and closing time of an engine valve, and the fuel efficiency of the internal combustion engine is improved. The device has the greatest advantages that the radial arrangement of the two needle roller bearings can not only reduce the axial size and weight, but also improve the efficiency of the phase adjusting device, simultaneously reduce the working noise of the phase adjusting device and prolong the service life.
After the structure is adopted, the axial size and the weight can be reduced, and the two-stage speed reduction large speed ratio 100-200 can be realized, so that the power of the motor is reduced.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (8)
1. A variable valve timing electric phasing transmission device is characterized by comprising:
a camshaft;
a center bolt connected with a first end of the camshaft;
the output inner gear ring is fixedly sleeved on one side of the cam shaft and is provided with an inner gear ring;
the support sleeve is fixedly arranged on the output inner gear ring;
the eccentric shaft is rotatably sleeved on the support sleeve through a small needle bearing;
the planet gear is rotatably sleeved on the eccentric shaft, a large tooth part and a small tooth part are arranged on the planet gear, and the small tooth part is meshed with the inner gear ring of the output inner gear ring;
the input inner gear ring is sleeved on the planet gear, and an inner tooth part of the input inner gear ring is meshed with a large tooth part of the planet gear;
the chain wheel is fixedly connected with the input inner gear ring and radially sleeved outside the output inner gear ring;
and the driving mechanism can drive the eccentric shaft to rotate.
2. The variable valve timing electro-dynamic phasing transmission of claim 1, wherein the driving mechanism comprises a motor, a motor dial and a spacer, the spacer is fixedly connected with the eccentric shaft, the motor dial is connected with a rotating shaft of the motor, and the motor dial can be adapted with the spacer.
3. The variable valve timing electro-phasing transmission of claim 2, wherein the planet wheels are rotatably mounted on the eccentric shaft by large needle bearings.
4. The variable valve timing electro-dynamic phasing transmission of claim 3, wherein the spacer is a plastic spacer.
5. The variable valve timing electro-dynamic phasing transmission device according to claim 4, wherein a cavity is provided in the sprocket, and the output ring gear is mounted in the cavity of the sprocket.
6. The variable valve timing electric phasing transmission device according to claim 5, wherein the input ring gear and the sprocket are engaged by a stepped surface, and the input ring gear and the sprocket are fastened by a bolt.
7. The variable valve timing electric phasing transmission device according to claim 6, wherein a bottom surface and an outer peripheral surface of the output ring gear are fitted with a bottom surface and an inner peripheral surface of the sprocket; and two sides of the large tooth part of the planet gear are in clearance fit with the end surfaces between the output inner gear ring and the input inner gear ring.
8. The variable valve timing electro-phasing transmission of claim 7, wherein the center bolt is threadedly coupled to a camshaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110349572.0A CN112943402A (en) | 2021-03-31 | 2021-03-31 | Variable valve timing electric phase modulation transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110349572.0A CN112943402A (en) | 2021-03-31 | 2021-03-31 | Variable valve timing electric phase modulation transmission device |
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| Publication Number | Publication Date |
|---|---|
| CN112943402A true CN112943402A (en) | 2021-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110349572.0A Pending CN112943402A (en) | 2021-03-31 | 2021-03-31 | Variable valve timing electric phase modulation transmission device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104791457A (en) * | 2013-10-28 | 2015-07-22 | 蒂森克虏伯普利斯坦技术中心股份公司 | Method for producing lightweight designed camshaft |
| CN108952873A (en) * | 2018-08-31 | 2018-12-07 | 绵阳富临精工机械股份有限公司 | A kind of rear-mounted VVT phaser |
| CN108979775A (en) * | 2018-08-31 | 2018-12-11 | 绵阳富临精工机械股份有限公司 | A kind of forward type VVT phaser |
| CN109653828A (en) * | 2017-10-10 | 2019-04-19 | 博格华纳公司 | The eccentric gear that bearing span reduces |
| CN110295964A (en) * | 2019-05-09 | 2019-10-01 | 湖南大兹动力科技有限公司 | A kind of engine valve control device that motor is adjusted |
-
2021
- 2021-03-31 CN CN202110349572.0A patent/CN112943402A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104791457A (en) * | 2013-10-28 | 2015-07-22 | 蒂森克虏伯普利斯坦技术中心股份公司 | Method for producing lightweight designed camshaft |
| CN109653828A (en) * | 2017-10-10 | 2019-04-19 | 博格华纳公司 | The eccentric gear that bearing span reduces |
| CN108952873A (en) * | 2018-08-31 | 2018-12-07 | 绵阳富临精工机械股份有限公司 | A kind of rear-mounted VVT phaser |
| CN108979775A (en) * | 2018-08-31 | 2018-12-11 | 绵阳富临精工机械股份有限公司 | A kind of forward type VVT phaser |
| CN110295964A (en) * | 2019-05-09 | 2019-10-01 | 湖南大兹动力科技有限公司 | A kind of engine valve control device that motor is adjusted |
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