WO2012122845A1 - 一种全可变气门升程机构的偏心轴控制系统 - Google Patents
一种全可变气门升程机构的偏心轴控制系统 Download PDFInfo
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- WO2012122845A1 WO2012122845A1 PCT/CN2011/084611 CN2011084611W WO2012122845A1 WO 2012122845 A1 WO2012122845 A1 WO 2012122845A1 CN 2011084611 W CN2011084611 W CN 2011084611W WO 2012122845 A1 WO2012122845 A1 WO 2012122845A1
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- WIPO (PCT)
- Prior art keywords
- eccentric shaft
- valve lift
- control system
- variable valve
- lift mechanism
- Prior art date
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Classifications
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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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- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio
- F01L13/0026—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio by means of an eccentric
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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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
- F01L2013/0068—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot with an oscillating cam acting on the valve of the "BMW-Valvetronic" type
Definitions
- the present invention relates to the field of automobile manufacturing, and more particularly to an eccentric shaft control system for a fully variable valve lift mechanism in an internal combustion engine of an automobile. Background technique
- variable valve trains puts higher demands on the control of the system.
- the variable gas distribution system needs to be able to meet the variable demand of valve lift, duration and timing; on the other hand, it is guaranteed to regulate Accurate, avoid system failure, thus enhance the reliability of the engine work; In addition, we must minimize the weight and complexity of the system.
- the invention designs an eccentric shaft control system of a fully variable valve lift mechanism, which solves the technical problem that the existing eccentric shaft control mechanism has a complicated structure, low reliability and cannot make the eccentric shaft rotate at a minimum.
- the adjustment between the adjustment of the valve lift from zero to the maximum is achieved within the range.
- the present invention adopts the following scheme:
- the eccentric shaft control system of the fully variable valve lift mechanism, the engine cylinder head (7) is provided with a bearing seat (5), the bearing seat (5) is provided with an eccentric shaft (4), and the eccentric shaft (4) is provided
- the eccentric wheel (43); the worm (12) is mounted on the rotor of the motor (1), and the worm wheel (14) is fixedly coupled to the eccentric shaft journal (44), characterized in that: the motor (1) drives the worm (12) and During the mutual engagement of the worm wheel (14), the eccentric shaft (4) can adjust the valve lift from zero to the maximum value with only 0 degree to 180 degree rotation change under the action of an angle limit device.
- the angle limiting device includes an upper limit hole (41), a lower limit hole (42), and a limit pin (32), and the upper limit hole (41) and the lower limit hole (42) are disposed on the eccentric shaft (4), and The plane in which the upper limit hole (41) and the lower limit hole (42) are located divides the eccentric shaft (4) into two equal parts.
- the area where the gear is continuously placed on the worm wheel (14) is half the circumference of the worm gear (14).
- a bearing cap assembly (3) is included, and the bearing cap assembly (3) is used to limit the eccentric shaft (4) to the bearing housing (5).
- one end of the limit pin (32) is fixed to the bearing cap assembly (3) through a pin hole (31).
- One end of the worm (12) has a head engaging with a needle bearing (13), and the other end of the needle bearing (13) is mounted on the bearing cap assembly (3).
- a positioning pin (45) for preventing mutual rotation is disposed between the worm wheel (14) and the eccentric shaft (4), and the positioning pin (45) is fixed to the eccentric shaft (4).
- the two thrust faces (46) on the eccentric shaft (4) and the bearing seat thrust faces (51) are engaged with each other to ensure axial positioning of the eccentric shaft (4) on the bearing housing (5).
- a motor mounting bracket (2) is disposed between the motor (1) and the bearing cap assembly (3), and a motor flange (11) is mounted in the motor mounting bracket (2).
- bearing cap assembly (3) is further provided with a lightening hole (33) and a retaining hole (34).
- the present invention can adjust the adjustment of the valve lift from zero to the maximum value by controlling the rotation of the eccentric shaft from 0 to 180 degrees by the angle limiting device, ensuring precise control, avoiding system failure and thereby enhancing Reliability of engine operation.
- the present invention not only satisfies the design requirements, but also saves materials and reduces the moment of inertia because the worm wheel adopts a half-gear design.
- the invention belongs to the rolling friction between the worm and the needle bearing, and is used for reducing the frictional force of the rotation of the motor rotor, and the radial limit of the two can ensure the long-term movement and stable operation of the rotor and the worm of the motor.
- the present invention can minimize the weight and complexity of the system by providing a weight reducing hole and a retaining hole in the bearing cap assembly.
- FIG. 1 is a schematic structural view of an eccentric shaft control system of a fully variable valve lift mechanism of the present invention
- Figure 2 is a cross-sectional view showing the structure of a worm gear in the present invention
- Figure 3 is a cross-sectional view taken along line A-A of Figure 2;
- Figure 4 is a schematic view showing the structure arrangement of a worm gear in the present invention
- Figure 5 is an enlarged schematic view showing the connection structure of the worm gear in the present invention
- Figure 6 is a schematic view showing the installation of the eccentric shaft and the bearing housing in the present invention.
- Figure 7 is a schematic view showing the installation of the bearing cap assembly and the motor mounting bracket of the present invention.
- Figure 8 is a schematic view showing the structure of the bearing cap assembly of the present invention.
- an eccentric shaft control system of a fully variable valve lift mechanism is provided with a bearing housing 5 on the engine cylinder head 7, an eccentric shaft 4 is mounted on the bearing housing 5, and an eccentric shaft 4 is provided with an eccentricity.
- the wheel 43 further comprising a bearing cap assembly 3 for limiting the eccentric shaft 4 to the bearing housing 5, the bolt 6 for fastening; the worm 12 mounted on the rotor of the motor 1, the worm gear 14 fixed
- the eccentric shaft 4 is connected to the eccentric shaft journal 44.
- the angle limiting device includes an upper limit hole 41, a lower limit hole 42 and a limit pin 32.
- the upper limit hole 41 and the lower limit hole 42 are disposed on the eccentric shaft 4, and the upper limit hole 41 and the lower limit hole 42
- the plane in which it is placed divides the eccentric shaft 4 into two equal parts, and one end of the limit pin 32 can be fixed to the bearing cap assembly 3 through the pin hole 31.
- the working principle of the angle limiting device is as follows:
- the motor 1 drives the worm 12 to rotate, and the worm 12 drives the worm wheel 14 and the eccentric shaft 4 to rotate together by means of gear meshing.
- the eccentric shaft 4 is provided with an upper limit hole 41 and a lower limit hole 42
- the limit pin 32 is located on the trajectory of the rotational movement of the upper limit hole 41 and the lower limit hole 42.
- the eccentric shaft 4 Since the upper limit hole 41 and the lower limit hole 42 divide the circumference of the eccentric shaft 4 into two equal parts, the eccentric shaft 4 will only reciprocate in the interval of 0 to 180 degrees, thereby generating a mechanical stop position, thereby It is ensured that the rotation of the motor is only between the upper limit hole 41 and the lower limit hole 42.
- the relevant motor parameters can be set. In this state, the maximum valve lift mode is enabled in this state, and the load of the engine is adjusted by a conventional throttle. In addition, adjustments can be made to adjust the valve lift from zero to maximum, ensuring precise control, avoiding system failures and thereby enhancing engine reliability.
- the area where the gear is continuously provided on the worm wheel 14 is half the circumference of the worm wheel 14. Therefore, not only the design requirements are met, but also materials can be saved and the motion inertia can be reduced.
- the one end of the worm 12 is engaged with the needle bearing 13, and the other end of the needle bearing 13 is mounted on the bearing cap assembly 3. Because the rolling friction between the worm and the needle bearing is used to reduce the frictional friction of the rotor of the motor, the radial limit of the two can ensure the long-term movement and stable operation of the rotor and the worm.
- a locating pin 45 for preventing mutual rotation is disposed between the worm wheel 14 and the eccentric shaft 4, and the positioning pin 45 is fixed to the eccentric shaft 4.
- a motor mounting bracket 2 is disposed between the motor 1 and the bearing cap assembly 3, and a motor flange 11 is mounted in the motor mounting bracket 2.
- the bearing cap assembly 3 also has a lightening hole 33 and a retaining hole 34 to minimize the weight and complexity of the system.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Description
说 明 书
一种全可变气门升程机构的偏心轴控制系统 技术领域
本发明涉及汽车制造领域, 特别涉及一种汽车内燃机中全可变气门升程机构的偏心轴 控制系统。 背景技术
可变配气机构的发展对系统的控制提出了更高的要求, 一方面, 可变配气系统需要能 够满足气门升程、 持续期、 正时的可变需求; 另一方面, 得保证调控精确、 避免系统故障, 从而增强发动机工作的可靠性; 另外, 得尽量减轻系统重量、 复杂性。
中国专利 CN200910116666. 2, "一种可实现无级调节的气门升程控制机构"中的偏心 轴控制机构结构比较复杂和可靠性不高。 发明内容
本发明设计了一种全可变气门升程机构的偏心轴控制系统, 其解决的技术问题是现有 的偏心轴控制机构结构比较复杂、 可靠性不高并且不能在使偏心轴在最小的旋转范围内实 现调节气门升程从零到最大值之间的调节。
为了解决上述存在的技术问题, 本发明采用了以下方案:
一种全可变气门升程机构的偏心轴控制系统, 发动机缸盖 (7 )上装有轴承座 (5), 轴 承座(5)上装有偏心轴(4), 偏心轴(4)上设有偏心轮(43 ); 蜗杆(12 )安装在电机(1 ) 的转子上, 蜗轮 (14) 固定连接在偏心轴轴颈 (44) 上, 其特征在于: 电机 (1 )驱动蜗杆 ( 12 ) 与蜗轮 (14) 相互啮合过程中, 在一角度限位装置作用下, 偏心轴 (4) 只需 0度至 180度旋转变化就能实现调节气门升程从零到最大值之间的调节。
所角度限位装置包括上限位孔(41 )、下限位孔(42 )以及限位销(32), 上限位孔(41 ) 和下限位孔 (42)设置在偏心轴 (4) 上, 并且上限位孔 (41 )和下限位孔 (42 )所处的平 面将偏心轴 (4) 分成两等份。
进一歩, 在蜗轮 (14) 上连续设置齿轮的区域为蜗轮 (14) 周长的一半。
进一步, 还包括一轴承盖总成 (3), 轴承盖总成 (3 ) 用于将偏心轴 (4) 限制在轴承 座 ( 5 ) 上。
进一步, 限位销 (32) 的一端通过销孔 (31 ) 固定在轴承盖总成 (3 ) 上。
所述蜗杆 (12) 的一端头部与滚针轴承 (13)相互配合, 所述滚针轴承 (13) 的另一 端安装在所述轴承盖总成 (3) 上。
进一步, 蜗轮 (14) 与偏心轴 (4) 之间设置一防止相互转动的定位销 (45), 定位销 (45) 固定在偏心轴 (4) 上。
进一步, 偏心轴 (4)上的两个止推面 (46)和轴承座止推面 (51)相互咬合保证偏心 轴 (4)在轴承座 (5) 上的轴向定位。
进一步, 电机 (1) 与轴承盖总成 (3) 之间设有一电机安装支座 (2), 电机安装支座 (2) 中安装有电机法兰 (11)。
进一步, 轴承盖总成 (3) 上还设有减重孔 (33)和让位孔 (34)。
该全可变气门升程机构的偏心轴控制系统与传统的偏心轴相比, 具有以下有益效果:
(1)本发明由于通过角度限位装置控制偏心轴在 0度至 180度旋转变化, 就可实现调 节气门升程从零到最大值之间的调节, 保证调控精确、 避免系统故障以及从而增强发动机 工作的可靠性。
(2)本发明由于将蜗轮采用一半齿轮的设计方式, 不仅满足设计需求, 同时可以节约 材料, 减轻运动惯量。
(3)本发明由于蜗杆与滚针轴承之间属于滚动摩擦,用于减小电机转子旋转的摩擦力, 同时两者径向的限位可以保证电机转子以及蜗杆的长时间运动与稳定工作。
(4)本发明由于偏心轴上的两个止推面和轴承座止推面相互咬合, 可以保证偏心轴在 轴承座上的轴向定位。
(5)本发明由于在轴承盖总成上还设有减重孔和让位孔, 可以尽量减轻系统的重量和 复杂性。 附图说明
为了更清楚地说明本发明实施例中的技术方案, 下面将对实施例描述中所需要使用的 附图作简单地介绍, 显而易见地, 下面描述中的附图仅仅是本发明的一些实施例, 对于本 领域普通技术人员来讲, 在不付出创造性劳动的前提下, 还可以根据这些附图获得其他的 附图。
图 1是本发明全可变气门升程机构的偏心轴控制系统的结构示意图;
图 2是本发明中的蜗轮蜗杆结构布置剖视图;
图 3是图 2中 A-A向剖面示意图;
图 4是本发明中蜗轮蜗杆结构布置示意图;
图 5是本发明中蜗轮蜗杆连接结构放大示意图;
图 6是本发明中偏心轴与轴承座安装示意图;
图 7是本发明中轴承盖总成与电机安装支座的安装示意图;
图 8是本发明中轴承盖总成的结构示意图。
附图标记说明:
1 电机; 2—电机安装支座; 3 轴承盖总成; 4一偏心轴; 5—轴承座; 6 螺栓; 7— 发动机缸盖; 11一电机法兰; 12 蜗杆; 13—滚针轴承; 14 蜗轮; 15—安装孔; 21—螺 栓; 31 销孔; 32—限位销; 33—减重孔; 34—让位孔; 35—安装法兰; 41一上限位孔; 42—下限位孔: 43—偏心轮; 44 偏心轮轴颈; 45—定位销; 46—止推面; 51—轴承座止 推面。 具体实施方式
为使本发明的目的、 技术方案和优点更加清楚, 下面将结合附图对本发明实施方式作 进一步地详细描述。
如图 1和图 6所示, 一种全可变气门升程机构的偏心轴控制系统, 发动机缸盖 7上装 有轴承座 5,轴承座 5上装有偏心轴 4,偏心轴 4上设有偏心轮 43,还包括一轴承盖总成 3, 轴承盖总成 3用于将偏心轴 4限制在轴承座 5上, 螺栓 6用于紧固; 蜗杆 12安装在电机 1 的转子上, 蜗轮 14固定连接在偏心轴轴颈 44上, 电机 1驱动蜗杆 12与蜗轮 14相互啮合 过程中, 通过一角度限位装置作用下, 偏心轴 4只需 0度至 180度旋转变化就能实现调节 气门升程从零到最大值之间的调节。
具体来说: 角度限位装置包括上限位孔 41、 下限位孔 42以及限位销 32, 上限位孔 41 和下限位孔 42设置在偏心轴 4上, 并且上限位孔 41和下限位孔 42所处的平面将偏心轴 4 分成两等份, 限位销 32的一端可以通过销孔 31固定在轴承盖总成 3上。
该角度限位装置的工作原理如下: 电机 1驱动蜗杆 12旋转, 蜗杆 12通过齿轮啮合的 方式驱动蜗轮 14和偏心轴 4共同旋转,由于偏心轴 4上设置了上限位孔 41和下限位孔 42, 并且限位销 32位于上限位孔 41和下限位孔 42旋转运动的轨迹上。 当上限位孔 41旋转至 限位销 32处时, 限位销 32将阻挡上限位孔 41和偏心轴 4继续向上运动, 偏心轴 4将反向 运动, 当下限位孔 42旋转至限位销 32处时, 限位销 32将阻挡下限位孔 42和偏心轴 4继 续向下运动。 由于上限位孔 41和下限位孔 42将偏心轴 4的周长平分为两个等份, 因而偏 心轴 4将只会在 0度至 180度区间内往返运动, 从而产生了机械停止位, 从而保证电机的 旋转只是在上限位孔 41和下限位孔 42之间。 应急模式下, 通过相关电机参数的设定, 可
以设计该状态下启用最大气门升程模式, 通过传统的节气门来调节发动机的负荷。 此外, 还可以实现调节气门升程从零到最大值之间的调节, 保证调控精确、 避免系统故障以及从 而增强发动机工作的可靠性。
如图 2和图 3所示, 在蜗轮 14上连续设置齿轮的区域为蜗轮 14周长的一半。 因而不 仅满足设计需求, 同时可以节约材料, 减轻运动惯量。
如图 4和图 5所示, 蜗杆 12的一端头部与滚针轴承 13相互配合, 滚针轴承 13的另一 端安装在轴承盖总成 3上。 由于蜗杆与滚针轴承之间属于滚动摩擦, 用于减小电机转子的 旋转的摩擦力, 同时两者径向的限位可以保证电机转子以及蜗杆长时间的运动与稳定工作。
如图 6所示, 蜗轮 14与偏心轴 4之间设置一防止相互转动的定位销 45, 定位销 45固 定在偏心轴 4上。
偏心轴 4上的两个止推面 46和轴承座止推面 51相互咬合, 可以保证偏心轴在轴承座 上的轴向定位。
如图 7和图 8所示, 电机 1与轴承盖总成 3之间设有一电机安装支座 2, 电机安装支座 2中安装有电机法兰 11。
轴承盖总成 3上还设有减重孔 33和让位孔 34, 可以尽量减轻系统的重量和复杂性。 以上所述仅为本发明的较佳实施例, 并不用以限制本发明, 凡在本发明的精神和原则 之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。
Claims
1、 一种全可变气门升程机构的偏心轴控制系统, 发动机缸盖 (7) 上装有轴承座 (5), 轴承座(5)上装有偏心轴(4), 偏心轴(4)上设有偏心轮(43); 蜗杆(12)安装在电机(1 ) 的转子上,蜗轮(14)固定连接在偏心轴轴颈(44)上,其特征在于: 电机(1 )驱动蜗杆(12) 与蜗轮(14)相互啮合过程中, 在一角度限位装置作用下, 偏心轴(4)只需 0度至 180度旋 转变化就能实现调节气门升程从零到最大值之间的调节。
2、根据权利要求 1所述全可变气门升程机构的偏心轴控制系统, 其特征在于: 所角度限 位装置包括上限位孔 (41 )、 下限位孔 ( 42 ) 以及限位销 (32), 上限位孔 ( 41 ) 和下限位孔
(42)设置在偏心轴(4)上, 并且上限位孔(41 )和下限位孔(42)所处的平面将偏心轴(4) 分成两等份。
3、根据权利要求 2所述全可变气门升程机构的偏心轴控制系统,其特征在于:在蜗轮( 14) 上连续设置齿轮的区域为蜗轮 (14) 周长的一半。
4、 根据权利要求 1、 2或 3所述全可变气门升程机构的偏心轴控制系统, 其特征在于- 还包括一轴承盖总成 (3), 轴承盖总成 (3) 用于将偏心轴 (4) 限制在轴承座 (5 ) 上。
5、根据权利要求 4所述全可变气门升程机构的偏心轴控制系统,其特征在于:限位销(32) 的一端通过销孔 (31 ) 固定在轴承盖总成 (3 ) 上。
6、根据权利要求 5所述全可变气门升程机构的偏心轴控制系统, 其特征在于: 所述蜗杆 ( 12) 的一端头部与滚针轴承 (13 )相互配合, 所述滚针轴承 (13 ) 的另一端安装在所述轴 承盖总成 (3 ) 上。
7、根据权利要求 6所述全可变气门升程机构的偏心轴控制系统,其特征在于:蜗轮(14) 与偏心轴(4)之间设置一防止相互转动的定位销(45), 定位销(45 )固定在偏心轴(4)上。
8、根据权利要求 1至 7中任何一项所述全可变气门升程机构的偏心轴控制系统,其特征 在于: 偏心轴 (4) 上的两个止推面 (46)和轴承座止推面 (51)相互咬合保证偏心轴 (4) 在轴承座 (5) 上的轴向定位。
9、根据权利要求 1至 8中任何一项所述全可变气门升程机构的偏心轴控制系统,其特征 在于: 电机(1)与轴承盖总成 (3)之间设有一电机安装支座(2), 电机安装支座 (2) 中安 装有电机法兰 (11)。
10、 根据权利要求 9所述全可变气门升程机构的偏心轴控制系统, 其特征在于: 轴承盖 总成 (3) 上还设有减重孔 (33)和让位孔 (34)。
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