A control mechanism for realizing independent adjustment of hydraulic variable valve system

Abstract

The application discloses a control mechanism for realizing independent adjustment of a hydraulic variable valve system. Two or more control tooth fans in the control mechanism only occupy the space of a single transmission shaft, and can independently adjust the on-off time of two or more rotating valves in an oil control device under the drive of respective driving devices. The control mechanism comprises a first driving device, a second driving device, a first driving gear, a second driving gear, a first control transmission system and a second control transmission system. The control mechanism is matched with the oil control device of the hydraulic variable valve system, wherein the transmission shaft serves as the transmission torque of the first control transmission system and also serves as the rotation center of other control transmission systems to support the shaft. Through independent rotation adjustment of two or more control tooth fans installed on the same rotation center shaft, independent control of the variable opening processes of two or more groups of valves can be realized.

Description

Technical Field

[0001] This invention relates to the field of valve mechanisms for internal combustion engines, and in particular to a control mechanism for realizing independent adjustment of a hydraulic variable valve system. Background Technology

[0002] Variable valve timing technology plays a crucial role in improving the power and economy of internal combustion engines while reducing pollutant emissions, and has therefore experienced rapid development and widespread application in recent years. To further unlock the functional and performance potential of internal combustion engines, researchers have developed hydraulic variable valve timing systems with multiple valve opening functions. These systems not only allow for flexible changes in single or multiple parameters such as valve opening timing, opening duration, and opening lift, but also gradually evolve from single-valve variable valve timing to multiple valves that can be independently variable.

[0003] The variable valve timing function of a hydraulic variable valve system is achieved by controlling the connection or disconnection between the high-pressure oil circuit and the low-pressure system that drives the valve opening. High-frequency solenoid valves and mechanical control valves are the most commonly used oil circuit on / off switches. Compared to high-frequency solenoid valves, mechanical control valves have advantages such as fast frequency response, reliable operation, and low operating costs. However, due to the limitations of their mechanical structure, their control mechanism places high demands on their installation and application in actual internal combustion engines. They must not only meet the requirements of high control accuracy, fast response, and stable operation, but also be compact and space-saving.

[0004] Chinese invention patent ZL201310296611.0 discloses an oil control device for a fully variable hydraulic valve system of an internal combustion engine, wherein the rotary valve assembly is a mechanical oil control valve with adjustable opening time. This oil control device is used when the high and low pressure on / off states of two or more valve drive oil circuits are independently adjusted, requiring the control mechanism to independently control the switching of two or more independent rotary valves. If this process uses a traditional single-shaft, single-tooth sector control mechanism, multiple independent drive shaft systems are required, resulting in significant space occupation and increasing the overall height of the internal combustion engine, which is detrimental to actual installation layout. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides a control mechanism that is compact, highly expandable, and occupies only the space of a single drive shaft to achieve independent adjustment of a hydraulic variable valve system. Its main feature is that by driving two or more coaxially arranged but independent control gear sectors to rotate by a certain adjustment angle, the on / off timing of two or more rotary valves in the oil control device is changed, thereby realizing the independent adjustment of the variable opening of two or more sets of valves in the hydraulic variable valve system. The various valve opening modes formed by the control play an important role in improving the overall performance of the engine.

[0006] The present invention adopts the following technical solution:

[0007] A control mechanism for independently adjusting a hydraulic variable valve system includes: a first drive device, a second drive device, a first drive gear, a second drive gear, a first control transmission system, and a second control transmission system;

[0008] The first drive gear is fixedly connected to the output end of the first drive device, and the second drive gear is fixedly connected to the output end of the second drive device;

[0009] The first control transmission system includes a drive shaft, a drive shaft control gear sector, and a first control gear sector. The drive shaft is mounted on a support body near the controlled object via bearings. The drive shaft control gear sector is fixedly mounted on the drive shaft, and the first drive gear drives the drive shaft control gear sector to rotate. The first control gear sector is fixedly mounted on the drive shaft, and the torque of the first drive device is transmitted to the first control gear sector through the first drive gear, the drive shaft control gear sector, and the drive shaft.

[0010] The second control transmission system includes a bearing and a second control gear sector. The bearing is installed in the center hole of the second control gear sector. The combination of the second control gear sector and the bearing is installed on the transmission shaft and can rotate around the shaft. The torque of the second drive device is transmitted to the second control gear sector through the second drive gear.

[0011] The control mechanism of this invention is matched and connected to the oil control device of the hydraulic variable valve system. The drive shaft in the mechanism serves both as a component of the first control transmission system to transmit torque and as a support shaft as the rotation center of the second control transmission system. By having two control gear sectors that occupy only the space of a single drive shaft rotate independently, independent control of the two rotary valve switches in the oil control device can be achieved. By adding additional second control transmission system components in groups on the drive shaft, and correspondingly adding a drive device and drive gear, independent control of more than two rotary valve switches in the oil control device can be achieved.

[0012] Furthermore, the first driving device and the second driving device are stepper motors, DC motors, rotary electromagnets or hydraulic swing cylinders that output rotational angles, or proportional electromagnets that output linear displacement.

[0013] Furthermore, the first and second drive gears can be sector gears or racks.

[0014] Furthermore, the gears of the drive shaft control sector, the first control sector, and the second control sector are gears.

[0015] Furthermore, the bearing is a rolling bearing or a sliding bearing.

[0016] Furthermore, the drive shaft extends along the axial direction and is fixedly mounted with two or more first control gear sectors. The torque of the first drive device is transmitted to the two or more first control gear sectors through the drive shaft to achieve synchronous control of the rotary valve switching of the same function in a multi-cylinder internal combustion engine.

[0017] Furthermore, the second control transmission system also includes a second control gear sector connecting rod, which transmits the torque of the second drive device to two or more second control gear sectors to achieve synchronous control of the rotary valve switching of the same function in a multi-cylinder internal combustion engine.

[0018] Furthermore, the first drive device and / or the second drive device are provided with an adjustable mechanical zero point.

[0019] Furthermore, the first control transmission system and / or the second control transmission system are provided with an adjustable mechanical zero point.

[0020] Furthermore, the first control transmission system and / or the second control transmission system are provided with a reset device, and the output torque of the first drive device and the second drive device can overcome the reset torque to drive.

[0021] In application, this invention is matched and connected with the oil control device of the hydraulic variable valve system of an internal combustion engine, which can realize the independent adjustment of two or more rotary valve switches. The first control tooth sector drives the rotary valve sleeve of the first rotary valve switch to rotate, and the second control tooth sector drives the rotary valve sleeve of the second rotary valve switch to rotate. For controlling two or more rotary valve switches, the driving method of controlling the rotary valve sleeve is also adopted.

[0022] The working process of this invention will be explained below using the independent control of two rotary valve switches as an example:

[0023] In the first control transmission system, the drive shaft is supported by bearings and installed in the mounting hole of the support body near the oil control device. The drive shaft can rotate around the central axis with relatively small rotational resistance. A drive shaft control gear sector and a first control gear sector are fixedly installed along the axis of the drive shaft. The drive shaft control gear sector meshes with and is driven by the first drive gear, and the first rotary valve sleeve meshes with and is driven by the first control gear sector. The axial position of the first control gear sector is determined by the position of the first rotary valve sleeve. The circumferential mounting angle of the first control gear sector can be adjusted and fixed after adjustment to achieve initial control angle adjustment.

[0024] In the second control transmission system, a needle roller bearing or a sliding bearing is installed in the center hole of the second control gear sector, and the combination of the two is installed on the transmission shaft. At this time, due to the presence of the bearing, the rotation processes of the second control gear sector and the transmission shaft are independent and do not interfere with each other.

[0025] When the first rotary valve switch is controlled, the first drive device rotates at a certain angle or generates a certain displacement at its output end according to the received signal, and drives the first drive gear fixedly connected to it to rotate or move synchronously. The control torque is transmitted to the first rotary valve sleeve in sequence through the first drive gear, the drive shaft control gear sector, the drive shaft, and the first control gear sector, so that the first rotary valve sleeve rotates by the required angle, thereby adjusting the oil discharge on / off time of the first rotary valve switch. When the second rotary valve switch is controlled, the second drive device rotates at a certain angle or generates a certain displacement at its output end according to the received signal, and drives the second drive gear fixedly connected to it to rotate or move synchronously. The control torque is transmitted to the second rotary valve sleeve in sequence through the second drive gear and the second control gear sector, so that the second rotary valve sleeve rotates by the required angle, thereby adjusting the oil discharge on / off time of the second rotary valve switch.

[0026] The beneficial effects of this invention are:

[0027] (1) The present invention has a simple overall structure and strong scalability. It can be used with hydraulic variable valve systems of single-cylinder and multi-cylinder internal combustion engines to realize independent control of the on and off times of multiple valve drive oil circuits of mechanical oil control valve, thereby realizing different variable opening functions of different valves.

[0028] (2) The transmission shaft in this invention serves as both a component of the control transmission system to transmit torque and a support shaft as the rotation center of the rotating component. It achieves independent rotation of the coaxial multi-tooth sector by occupying only the installation space of a single transmission shaft. Compared with the traditional multi-axis multi-tooth sector control method, it has a compact structure and occupies less space.

[0029] (3) When the present invention is applied to the hydraulic valve system of a multi-cylinder internal combustion engine for synchronous variable control of multiple valves, the rotary valve switches of each cylinder with the same variable function can be synchronously controlled by the same control mechanism, thereby reducing the number of drive devices used and improving the accuracy of synchronous control. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0031] Figure 1 This is a schematic diagram of the control mechanism for achieving independent adjustment of the hydraulic variable valve system in Example 1.

[0032] Figure 2 for Figure 1 AA section view.

[0033] Figure 3 for Figure 1 BB section view in the middle.

[0034] Figure 4 This is a schematic diagram of the synchronous control mechanism applied to two identical oil control devices in Example 2.

[0035] Figure label:

[0036] 1. Second drive unit; 2. Second drive gear; 3. First drive unit; 4. First drive gear; 5. Drive shaft control gear sector; 6. Drive shaft; 7. Second control gear sector; 7-1. Active second control gear sector; 7-2. Second control gear sector connecting rod; 7-3. Driven second control gear sector; 8. Needle roller bearing; 9. First control gear sector; 10. Fixing screw; 11. Adjusting block;

[0037] K-1, First rotary valve core; K-2, First rotary valve sleeve; K-3, Second rotary valve core; K-4, Second rotary valve sleeve;

[0038] L-1, Gear limiting groove; L-2, Adjusting screw mounting plate; L-3, Adjusting screw; L-4, Set nut. Detailed Implementation

[0039] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] Example 1:

[0042] like Figure 1 As shown, this embodiment provides a control mechanism for independently adjusting the switches of two rotary valves in a hydraulic variable valve system, including a second drive device 1, a second drive gear 2, a first drive device 3, a first drive gear 4, a first control transmission system, and a second control transmission system.

[0043] The first drive gear 4 is fixedly connected to the output end of the first drive device 3, and the second drive gear 2 is fixedly connected to the output end of the second drive device 1.

[0044] The first control transmission system includes a drive shaft 6, a drive shaft control gear sector 5, and a first control gear sector 9. The drive shaft 6 is mounted on a support near the rotary valve switch via bearings. The drive shaft control gear sector 5 is fixedly mounted on the drive shaft 6, and the first drive gear 4 drives the drive shaft control gear sector 5 to rotate. The first control gear sector 9 is fixedly mounted on the drive shaft 6, and the torque of the first drive device 3 is transmitted to the first control gear sector 9 in sequence through the first drive gear 4, the drive shaft control gear sector 5, and the drive shaft 6.

[0045] The second control transmission system includes a needle roller bearing 8 and a second control gear sector 7. The needle roller bearing 8 is installed in the center hole of the second control gear sector 7. The combination of the second control gear sector 7 and the needle roller bearing 8 is installed on the transmission shaft 6 and can rotate around the shaft. The torque of the second drive device 1 is transmitted to the second control gear sector 7 through the second drive gear 2.

[0046] Considering that the actual position of the rotary valve switch at the end of the last control cannot be determined after the drive device is powered on and reset, the control mechanism is equipped with an adjustable mechanical zero point, which allows for confirmation of the control start point at the initial stage of each control. When the adjustable mechanical zero point is located in the first drive device 3 or the second drive device 1, adjusting the mechanical zero point will affect the initial position of all control transmission systems after the drive device; when the adjustable mechanical zero point is located in the first control transmission system or the second control transmission system, adjusting the mechanical zero point will only affect the initial position of the rotary valve switch meshed with it. Specifically, such as... Figure 2 As shown, this embodiment presents an adjustable mechanical zero-point scheme. The first control gear sector 9 is fixedly mounted on the transmission shaft 6 by fixing screws 10 and adjusting blocks 11. By replacing different adjusting blocks 11, the initial installation angle of the first control gear sector 9 can be adjusted. Gear limiting grooves L-1 are provided at both ends of the first control gear sector 9. During the meshing process between the first control gear sector 9 and the control gear teeth of the second rotary valve sleeve K-2, when the control gear teeth of the second rotary valve sleeve K-2 move into the gear limiting groove L-1, rotation is hindered. The gear limiting groove L-1 acts as a mechanical stop point, restricting further rotation. Figure 3 As shown, this is another adjustable mechanical zero-point scheme in this embodiment. The end face of the second control gear sector 7 contacts the adjusting screw L-3. The initial installation angle of the second control gear sector 7 is adjusted by changing the screw-out length of the adjusting screw L-3 mounted on the adjusting screw mounting plate L-2. After the screw-out length of the adjusting screw L-3 is adjusted, its position is fixed by the set nut L-4. This adjustment structure also serves to limit the rotation of the second control gear sector 7.

[0047] Furthermore, to ensure that the internal combustion engine can still operate normally in the event of a control mechanism failure, a reset device for the control transmission system is also provided in addition to the mechanical zero point already set. In the event of failure of the first drive device 3 or the second drive device 1, this reset device can drive the rotary valve sleeve to return to its initial state, enabling the hydraulic valve mechanism to meet the "limp-out" operating requirements of the internal combustion engine.

[0048] In application, this invention is matched and connected with the oil control device of the hydraulic variable valve system of an internal combustion engine, enabling independent adjustment of the first rotary valve switch and the second rotary valve switch. The first rotary valve switch consists of a first rotary valve core K-1 and a first rotary valve sleeve K-2, while the second rotary valve switch consists of a second rotary valve core K-3 and a second rotary valve sleeve K-4. The first control gear sector 9 of the control mechanism meshes with the control gear teeth of the first rotary valve sleeve K-2, and the second control gear sector 7 meshes with the control gear teeth of the second rotary valve sleeve K-4.

[0049] When the first rotary valve switch is controlled, the first drive device 3 rotates at a certain angle at its output end according to the received signal, and drives the first drive gear 4 fixedly connected to it to rotate synchronously. The control torque is transmitted to the control gear teeth of the first rotary valve sleeve K-2 through the first drive gear 4, the drive shaft control gear sector 5, the drive shaft 6, and the first control gear sector 9 in sequence, so that the first rotary valve sleeve K-2 rotates by the required angle, thus adjusting the oil discharge on / off time of the first rotary valve switch. When the second rotary valve switch is controlled, the second drive device 1 rotates at a certain angle at its output end according to the received signal, and drives the second drive gear 2 fixedly connected to it to rotate synchronously. The control torque is transmitted to the control gear teeth of the second rotary valve sleeve K-4 through the second drive gear 2 and the second control gear sector 7 in sequence, so that the second rotary valve sleeve K-4 rotates by the required angle, thus adjusting the oil discharge on / off time of the second rotary valve switch. When the control ends and is reset, the output ends of the first drive device 3 and the second drive device 1 rotate in the opposite direction of the control process, and the first rotary valve sleeve K-2 and the second rotary valve sleeve K-4 return to their initial installation positions through the same drive transmission chain.

[0050] In this embodiment, the drive shaft 6 serves both as a component of the first control transmission system to transmit torque and as the rotation center of the second control gear sector 7 in the second control transmission system to support the shaft. The independent rotation of the two coaxial gear sectors is achieved by occupying only the installation space of a single drive shaft 6 and the first control gear sector 9. Compared with the traditional multi-axis multi-gear sector control method, the structure is more compact and occupies less space.

[0051] Example 2:

[0052] When the system in Example 1 is applied to the hydraulic valve system of a multi-cylinder internal combustion engine for synchronous variable control of multiple valves, the rotary valve switches of each cylinder with the same variable function can be synchronously controlled through the same control mechanism, reducing the number of drive devices used and improving the accuracy of synchronous control. For two or more first rotary valve sleeves K-2, synchronous control is achieved by extending the drive shaft 6 and fixing two or more identical first control gear sectors 9; for two or more second rotary valve sleeves K-4, synchronous control is achieved by installing two or more second control gear sectors 7 and needle roller bearings 8 assemblies on the drive shaft 6, and simultaneously connecting the assemblies with second control gear sector connecting rods 7-2, as specifically... Figure 4 As shown, this embodiment provides a synchronous control mechanism for two identical fuel control devices in two cylinders of a multi-cylinder internal combustion engine. This control mechanism is an extension of Embodiment 1, with the main difference being:

[0053] (1) Extend the transmission shaft 6 in the first control transmission system and install two first control gear sectors 9 at the corresponding positions of the two sets of first rotary valve sleeves K-2 by fixing screws 10 and adjusting blocks 11;

[0054] (2) Modify the structure of the second control sector 7 in the second control transmission system. The second control sector 7 that directly meshes with the second drive gear 2 is used as the active second control sector 7-1. Add a mounting hole for the second control sector connecting rod 7-2. The active second control sector 7-1 is connected to the driven second control sector 7-3 through the second control sector connecting rod 7-2. The needle roller bearings 8 are installed in the center holes of the two second control sector 7. The assembly is installed together on the transmission shaft 6.

[0055] When controlling two sets of identical first rotary valve switches, the first drive device 3 rotates at a certain angle at its output end according to the received signal, and drives the first drive gear 4 fixedly connected to it to rotate synchronously; the control torque is transmitted to the control gear teeth of the two first rotary valve sleeves K-2 in sequence through the first drive gear 4, the transmission shaft control gear sector 5, the transmission shaft 6 and the two first control gear sectors 9, so that the two first rotary valve sleeves K-2 rotate at the required angle, and complete the synchronous adjustment of the oil discharge on and off time of the two sets of first rotary valve switches.

[0056] When controlling two identical sets of second rotary valve switches, the second drive device 1 rotates at a certain angle at its output end according to the received signal, and drives the second drive gear 2 fixedly connected to it to rotate synchronously; the control torque is transmitted to the control gear teeth of the two second rotary valve sleeves K-4 in sequence through the second drive gear 2, the active second control gear sector 7-1, the second control gear sector connecting rod 7-2 and the driven second control gear sector 7-3, so that the two second rotary valve sleeves K-4 rotate at the required angle, and complete the synchronous adjustment of the oil discharge on and off time of the two sets of second rotary valve switches.

[0057] In this embodiment, the two identical oil control devices share a single first drive device 3 and second drive shaft device 1, which not only reduces the number of drive devices used but also improves the accuracy of synchronous control. Although theoretically, extending the drive shaft 6, the first control gear sector 9, the second control gear sector connecting rod 7-2, and the driven second control gear sector 7-3 in a complete control mechanism as a group can achieve synchronous variable control of multiple identical rotary valve switches in a multi-cylinder internal combustion engine, the actual stress conditions during operation and the machining accuracy of components, as well as objective factors such as the load capacity of the drive device, the tolerance of the control mechanism components, and the difficulty of the assembly process, necessitates a reasonable arrangement of the number of extended control mechanism groups.

[0058] It should be further explained that the first driving device 3 and the second driving device 1 in the above embodiments 1 and 2 are divided into two types according to their output type. One type is a stepper motor, DC motor, rotary electromagnet or hydraulic swing cylinder that can output rotation angle. Their output end realizes the output of rotation angle through gears or gear sector. The other type is a proportional electromagnet that can output linear displacement. Its output end meshes with the next stage gear through a rack, which can also realize the output of rotation angle.

[0059] It should be further noted that the gear of the first drive gear 4 or the second drive gear 2 in the above embodiments 1 and 2 can be a sector gear or a rack; the sector gear of the drive shaft control sector gear 5 or the first control sector gear 9 or the second control sector gear 7 can be a gear.

[0060] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical spirit of the present invention. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A control mechanism for implementing independent adjustment of a hydraulic variable valve system, characterized by, include: A first drive unit, a second drive unit, a first drive gear, a second drive gear, a first control transmission system, and a second control transmission system; The first drive gear is fixedly connected to the output end of the first drive device, and the second drive gear is fixedly connected to the output end of the second drive device; The first control transmission system includes a drive shaft, a drive shaft control gear sector, and a first control gear sector. The drive shaft is mounted on a support body near the controlled object via bearings. The drive shaft control gear sector is fixedly mounted on the drive shaft, and the first drive gear drives the drive shaft control gear sector to rotate. The first control gear sector is fixedly mounted on the drive shaft, and the torque of the first drive device is transmitted to the first control gear sector through the first drive gear, the drive shaft control gear sector, and the drive shaft. The second control transmission system includes a bearing and a second control gear sector. The bearing is installed in the center hole of the second control gear sector. The combination of the second control gear sector and the bearing is installed on the transmission shaft and can rotate around the shaft. The torque of the second drive device is transmitted to the second control gear sector through the second drive gear.

2. The control mechanism for realizing independent adjustment of a hydraulic variable valve system according to claim 1, characterized in that, The first driving device and the second driving device are stepper motors, DC motors, rotary electromagnets or hydraulic swing cylinders that output rotation angles, or proportional electromagnets that output linear displacement.

3. The control mechanism for realizing independent adjustment of a hydraulic variable valve system according to claim 1 or 2, characterized in that, The first drive gear and the second drive gear are either a sector gear or a rack gear.

4. The control mechanism for realizing independent adjustment of a hydraulic variable valve system according to claim 1 or 2, characterized in that, The drive shaft control gear sector, the first control gear sector, and the second control gear sector are gears.

5. The control mechanism for implementing independent adjustment of a hydraulic variable valve system according to claim 1, wherein The bearing is a rolling bearing or a sliding bearing.

6. The control mechanism for implementing independent adjustment of a hydraulic variable valve system according to claim 1, wherein The drive shaft extends along the axial direction and is fixedly mounted with two or more first control gear sectors. The torque of the first drive device is transmitted to the two or more first control gear sectors through the drive shaft to realize synchronous control of the rotary valve switching of the same function in a multi-cylinder internal combustion engine.

7. The control mechanism for realizing independent adjustment of a hydraulic variable valve system according to claim 1, characterized in that, The second control transmission system also includes a second control gear sector connecting rod, which transmits the torque of the second drive device to two or more second control gear sectors to achieve synchronous control of the rotary valve switching of the same function in a multi-cylinder internal combustion engine.

8. The control mechanism for realizing independent adjustment of a hydraulic variable valve system according to claim 1, characterized in that, The first drive device and / or the second drive device are provided with an adjustable mechanical zero point.

9. The control mechanism for implementing independent adjustment of a hydraulic variable valve system according to claim 1, wherein The first control transmission system and / or the second control transmission system are equipped with an adjustable mechanical zero point.

10. The control mechanism for implementing independent adjustment of a hydraulic variable valve system according to claim 1, wherein The first control transmission system and / or the second control transmission system are provided with a reset device, and the output torque of the first drive device and the second drive device can overcome the reset torque to drive.

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