CN112901301A - Cam phase adjuster and machining method thereof - Google Patents
Cam phase adjuster and machining method thereof Download PDFInfo
- Publication number
- CN112901301A CN112901301A CN201911132250.XA CN201911132250A CN112901301A CN 112901301 A CN112901301 A CN 112901301A CN 201911132250 A CN201911132250 A CN 201911132250A CN 112901301 A CN112901301 A CN 112901301A
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- Prior art keywords
- stator
- rotor
- cover plate
- axial
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- 238000000034 method Methods 0.000 title claims description 14
- 238000003754 machining Methods 0.000 title claims description 11
- 230000004323 axial length Effects 0.000 claims abstract description 9
- 238000002360 preparation method Methods 0.000 claims 1
- 238000003672 processing method Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 210000001503 joint Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Classifications
-
- 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
- F01L1/3442—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 using hydraulic chambers with variable volume to transmit the rotating force
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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
- F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention relates to a cam phase adjuster and a processing method thereof. The cam phase adjuster comprises a stator, a rotor, a first cover plate and a second cover plate, wherein the rotor is coaxially arranged on the radial inner side of the stator, the first cover plate and the second cover plate are respectively fixed at the two axial ends of the stator, the stator and the rotor have the same axial length, the first cover plate is provided with a flat first axial end surface, the stator and the rotor are flatly abutted against the first axial end surface, the second cover plate is provided with a second axial end surface, the second axial end surface comprises a first area and a second area, the first area radially falls into the area of the stator when viewed in the axial direction, the rotor radially falls into the second area at any rotating position, the first area is flatly abutted against the stator, and an axial gap exists between the second area and the rotor. The cam phase adjuster and the processing method thereof can reduce the processing tolerance with lower processing cost.
Description
Technical Field
The invention relates to the technical field of internal combustion engines. In particular, the present invention relates to a cam phase adjuster and a method of manufacturing the same.
Background
In order to obtain the optimum combustion efficiency of an internal combustion engine, it is generally necessary to change the amount of intake air in the combustion chamber in accordance with the operating state of the engine, and Variable Valve Timing (VVT) technology has emerged. The main component that realizes variable valve timing is a hydraulic variable cam phase adjuster. The variable cam phase adjuster drives the rotor to rotate relative to the stator by hydraulic fluid, thereby adjusting the phase of the camshaft. Due to the presence of hydraulic fluid, oil leakage rate is an important performance parameter for variable cam phase adjusters, which has a significant impact on both stability of valve timing control and NVH (noise, vibration and harshness) performance.
In order to enable the rotor to rotate relative to the stator, there is a certain axial clearance between the rotor and the cover plate that encloses it within the stator. Such axial clearance causes a liquid leakage between the circumferential sides of the rotor blade and thus constitutes a major factor affecting the oil leakage rate. In the prior art, both axial ends of the rotor and the stator are individually surface-treated, and in order to obtain higher fitting accuracy, machining tolerances of the respective parts must be strictly controlled. This greatly increases the product rejection rate and processing costs.
US 2008/0254900a1 discloses a cam phase adjuster that designs the rotor in two parts that are able to slide relative to each other in the axial direction so that such a gap can be reduced by sliding the two parts of the rotor relative to each other after the rotor is assembled into the stator. However, this design changes the original structure of the rotor, which complicates the structure of the product and further increases the production cost.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to provide a cam phase adjuster with small tolerance and simple process and a method for manufacturing the same.
The above technical problem is solved by a cam phase adjuster according to the present invention. The cam phase adjuster comprises a stator, a rotor, a first cover plate and a second cover plate, wherein the rotor is coaxially installed on the radial inner side of the stator, the first cover plate and the second cover plate are fixed at the two axial ends of the stator respectively, the stator and the rotor have the same axial length, the first cover plate is provided with a flat first axial end face, the stator and the rotor are in butt joint with the first axial end face in a flush mode, the second cover plate is provided with a second axial end face, the second axial end face comprises a first area and a second area, the first area falls into the area of the stator in the radial direction when viewed in the axial direction, the rotor falls into the second area in the radial direction at any rotating position, the first area is in butt joint with the stator in a flat mode, and an axial gap exists between the second area and the. In this configuration, the stator and rotor have the same axial length for ease of machining, and clearance for allowing rotation of the rotor relative to the stator and cover plates is provided by only one recessed area in the cover plate, which can greatly reduce the axial tolerance of the entire cam phase adjuster after assembly, thereby reducing manufacturing costs.
According to a preferred embodiment of the invention, the first region surrounds the second region in a complete circumferential direction. This results in the second region being formed as a recessed surface region completely surrounded by the first region, while the first region can follow the stator evenly, so that the sealing contact surface between the cover plate and the stator also extends completely in the circumferential direction, thereby ensuring that no hydraulic fluid can leak out from between the cover plate and the stator.
According to another preferred embodiment of the invention, the second region is a circular region with a radius larger than the maximum radius of the rotor. The structure is simple in structure and easy to process, and is beneficial to further reducing the production cost.
According to another preferred embodiment of the invention, the second area is a flat surface area. The gap formed between the flat second region and the stator is also of a constant value.
The above technical problem is also solved by a machining method for the above cam phase adjuster according to the present invention. The processing method comprises the following steps: firstly, mounting a rotor on the radial inner side of a stator; then, mounting a first cover plate at the first axial ends of the stator and the rotor to enable the stator and the rotor to be in flush abutment with the first cover plate; finally, a second cover plate is mounted to the axial second ends of the stator and rotor such that the first region of the second cover plate abuts the stator.
According to a preferred embodiment of the present invention, after the rotor is mounted on the radially inner side of the stator and before the first cover plate is mounted on the first axial ends of the stator and the rotor, both axial ends of the stator and the rotor are simultaneously ground so as to be flush with the both axial ends of the stator and the rotor. This can ensure that a set of stator and rotor that pair uses has the same axial length of exact match to once only accomplish the both ends grinding of stator and rotor, saved process flow and manufacturing cost. The stator and rotor set thus processed can also be stored in sets during transport.
According to another preferred embodiment of the invention, the first cover plate, the second cover plate and the stator are fastened together by means of bolts after the second cover plate is mounted at the second axial ends of the stator and the rotor.
Drawings
The invention is further described below with reference to the accompanying drawings. Identical reference numbers in the figures denote functionally identical elements. Wherein:
FIG. 1 is a partial cross-sectional view of a cam phase adjuster according to an embodiment of the invention.
Detailed Description
Specific embodiments of a cam phase adjuster and a method of manufacturing the same according to the present invention will be described below with reference to the accompanying drawings. The following detailed description and drawings are included to illustrate the principles of the invention, which is not to be limited to the preferred embodiments described, but is to be defined by the appended claims.
According to an embodiment of the present invention, a cam phase adjuster is provided. As shown in fig. 1, the cam phase adjuster includes a stator 1, a rotor 2, and two cover plates 3, 4. The stator 1 is annular as a whole, the rotor 2 is disc-shaped as a whole, and the rotor 2 is coaxially mounted radially inside the stator 1 and is rotatable relative to the stator 1. As can be seen in the axial section shown in fig. 1, the axial lengths of the stator 1 and the rotor 2 are equal, and both axial end faces of each of the stator 1 and the rotor 2 are flat surfaces. When the rotor 2 is assembled in the stator 1, both axial ends of the stator 1 and the rotor 2 are axially aligned, respectively. A first cover plate 3 is mounted on one axial end (e.g., the right end in fig. 1) of the stator 1, and a second cover plate 4 is mounted on the other axial end (e.g., the left end in fig. 1) of the stator 1 opposite to the first cover plate 3. The axial end face of the first cover plate 3 facing the stator 1 is a flat surface so that it can simultaneously flush contact the axial end faces of the stator 1 and the rotor 2. The axial end face of the second cover plate 4 facing the stator 1 has two regions of different height, wherein the first region 41 is a region that surrounds the second region 42 in the complete circumferential direction. Both the first region 41 and the second region 42 are flat surfaces, and the surface of the second region 42 is recessed with respect to the surface of the first region 41 such that a stepped structure is formed therebetween. Viewed in the axial direction, the first region 41 falls completely radially into the region of the stator 1, while the rotor 2 falls completely radially into the second region 42 at any rotational position. Preferably, the second region 42 may be a circular region having a radius larger than the maximum radius of the rotor 2. This configuration is such that when the second cover plate 4 is mounted on the stator 1, the first region 41 abuts flat against the end face of the stator 1, while the second region 42 is present with an axial gap C from the rotor without contact. The presence of the clearance C allows the rotor 2 to rotate freely in the stator 1 without being obstructed by the cover plate.
According to another embodiment of the present invention, there is provided a machining method for machining the above-described cam phase adjuster. In this method, first, the rotor 2 is assembled to the radially inner side of the stator 1, and both axial ends thereof are aligned, respectively. Then, both axial end faces of the stator 1 and the rotor 2 may be ground simultaneously. The grinding process allows the end faces of the stator 1 and rotor 2 to meet surface accuracy requirements and ensures that the axial lengths of a set of stator 1 and rotor 2 pairs are perfectly matched. After grinding, the first cover plate 3 is mounted on one axial end of the stator 1 and the rotor 2. The axial end face of the first cover plate 3, in particular the axial end face for abutting the stator 1 and the rotor 2, has been machined beforehand so that the axial end face of the first cover plate 3 facing the stator 1 is a flat surface with sufficient surface precision. When the first cover plate 3 is attached to one axial end of the stator 1 and the rotor 2, the stator 1 and the rotor 2 abut flush against the flat surface of the first cover plate 3. Next, the second cover plate 4 is mounted on the other axial end of the stator 1 and the rotor 2 such that the second cover plate 4 abuts the end face of the stator 1 only through the first region 41, the first region 41 falling entirely in the radial direction in the region of the stator 1 as viewed in the axial direction, and the rotor 2 falling entirely in the radial direction in the second region 42 at any rotational position. Finally, the stator 1 and the two cover plates are fastened together by bolts (not shown) passing axially through mutually aligned through holes in the stator 1, the first cover plate 3 and the second cover plate 4.
In the cam phase adjuster according to the present invention, the stator 1 and the rotor 2 have the same axial length, which facilitates machining, and the clearance C for allowing the rotor 1 to rotate relative to the stator 2 and the cover plates 3, 4 is provided only by the height difference between the second region 42 and the first region 41 on the second cover plate 4, which can greatly reduce the axial tolerance of the entire cam phase adjuster after assembly, thereby reducing the production cost. According to the present invention, the dispersion of the leakage amount of the cam phase adjuster is reduced, thereby reducing the occurrence probability of NVH due to an excessive leakage amount of individual parts. In the corresponding processing method of the cam phase adjuster, two ends of the stator 1 and the rotor 2 can be ground simultaneously, so that the matched stator and rotor have the same axial length which is matched accurately, the two ends of the stator and the rotor are ground at one time, and the process flow and the production cost are saved.
Although possible embodiments have been described by way of example in the above description, it should be understood that numerous embodiment variations exist, still by way of combination of all technical features and embodiments that are known and that are obvious to a person skilled in the art. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. From the foregoing description, one of ordinary skill in the art will more particularly provide a technical guide to convert at least one exemplary embodiment, wherein various changes may be made, particularly in matters of function and structure of the components described, without departing from the scope of the following claims.
List of reference numerals
1 stator
2 rotor
3 first cover plate
4 second cover plate
41 first region
42 second region
C axial clearance
Claims (7)
1. A cam phase adjuster comprises a stator (1), a rotor (2), a first cover plate (3) and a second cover plate (4), wherein the rotor (2) is coaxially arranged on the radial inner side of the stator (1), the first cover plate (3) and the second cover plate (4) are respectively fixed at two axial ends of the stator (1),
it is characterized in that the preparation method is characterized in that,
the stator (1) and the rotor (2) have the same axial length, the first cover plate (3) has a flat first axial end face, the stator (1) and the rotor (2) abut flush against the first axial end face, the second cover plate (4) has a second axial end face, the second axial end face comprises a first area (41) and a second area (42), the first area (41) falls into the area of the stator (1) in the radial direction, the rotor (2) falls into the second area (42) in the radial direction at any rotation position, the first area (41) abuts flat against the stator (1), and an axial gap (C) exists between the second area (42) and the rotor (2).
2. The cam phase adjuster according to claim 1, wherein the first region (41) surrounds the second region (42) in a complete circumferential direction.
3. Cam phase adjuster according to claim 2, characterized in that the second region (42) is a circular region with a radius larger than the maximum radius of the rotor (2).
4. A cam phase adjuster according to any of claims 1 to 3, characterized in that the second region (42) is a flat surface region.
5. A machining method for a cam phase adjuster according to any one of claims 1 to 4, characterized by comprising the steps of:
(1) -mounting the rotor (2) radially inside the stator (1);
(2) mounting the first cover plate (3) at the axial first ends of the stator (1) and the rotor (2) so that the stator (1) and the rotor (2) are flush against the first cover plate (3);
(3) -mounting the second cover plate (4) at an axial second end of the stator (1) and the rotor (2) with the first region (41) of the second cover plate (4) abutting the stator (1).
6. The machining method according to claim 5, further comprising, after the step (1) and before the step (2), simultaneously grinding both axial ends of the stator (1) and the rotor (2) so that both axial ends of the stator (1) and the rotor (2) are flush.
7. The machining method according to any one of claims 5 to 6, characterized in that it further comprises, after said step (3), fastening together said first cover plate (3), said second cover plate (4) and said stator (1) by means of bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911132250.XA CN112901301A (en) | 2019-11-19 | 2019-11-19 | Cam phase adjuster and machining method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911132250.XA CN112901301A (en) | 2019-11-19 | 2019-11-19 | Cam phase adjuster and machining method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112901301A true CN112901301A (en) | 2021-06-04 |
Family
ID=76103430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911132250.XA Pending CN112901301A (en) | 2019-11-19 | 2019-11-19 | Cam phase adjuster and machining method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112901301A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220056818A1 (en) * | 2020-08-24 | 2022-02-24 | Miba Sinter Austria Gmbh | Method for producing a camshaft adjuster |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080254900A1 (en) * | 2006-12-13 | 2008-10-16 | Urckfitz Jason M | Axial lash control for a vane-type cam phaser |
| CN204002965U (en) * | 2014-05-30 | 2014-12-10 | 舍弗勒技术有限两合公司 | camshaft phase regulator |
| CN105221202A (en) * | 2014-05-30 | 2016-01-06 | 舍弗勒技术股份两合公司 | Camshaft phase adjuster |
| CN106795780A (en) * | 2014-08-27 | 2017-05-31 | 蒂森克虏伯普利斯坦技术中心股份公司 | Camshaft adjuster for adjusting the position of at least one cam portion |
| CN110366633A (en) * | 2017-03-02 | 2019-10-22 | 舍弗勒技术股份两合公司 | Hydraulic camshaft adjuster |
-
2019
- 2019-11-19 CN CN201911132250.XA patent/CN112901301A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080254900A1 (en) * | 2006-12-13 | 2008-10-16 | Urckfitz Jason M | Axial lash control for a vane-type cam phaser |
| CN204002965U (en) * | 2014-05-30 | 2014-12-10 | 舍弗勒技术有限两合公司 | camshaft phase regulator |
| CN105221202A (en) * | 2014-05-30 | 2016-01-06 | 舍弗勒技术股份两合公司 | Camshaft phase adjuster |
| CN106795780A (en) * | 2014-08-27 | 2017-05-31 | 蒂森克虏伯普利斯坦技术中心股份公司 | Camshaft adjuster for adjusting the position of at least one cam portion |
| CN110366633A (en) * | 2017-03-02 | 2019-10-22 | 舍弗勒技术股份两合公司 | Hydraulic camshaft adjuster |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220056818A1 (en) * | 2020-08-24 | 2022-02-24 | Miba Sinter Austria Gmbh | Method for producing a camshaft adjuster |
| US11629619B2 (en) * | 2020-08-24 | 2023-04-18 | Miba Sinter Austria Gmbh | Method for producing a camshaft adjuster |
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Effective date of registration: 20240320 Address after: 1st Floor, Building 2, No. 1 Antuo Road, Anting Town, Jiading District, Shanghai Applicant after: SCHAEFFLER HOLDING(CHINA) Co.,Ltd. Country or region after: China Address before: German Herzogenaurach Applicant before: SCHAEFFLER TECHNOLOGIES AG & CO.KG Country or region before: Germany |