Lift-controllable hydraulic tappet system
阅读说明:本技术 升程可控式液力挺柱系统 (Lift-controllable hydraulic tappet system ) 是由 陈涛 吴娟娟 苏波 眭超 刘子亮 罗辉 于 2020-06-29 设计创作,主要内容包括:本发明涉及内燃机技术领域,尤其涉及升程可控式液力挺柱系统,包括:挺柱和油压控制阀;所述挺柱,用于通过凸轮轴和油压控制阀,控制气阀组件的推杆的升程;所述油压控制阀,用于对挺柱输送压力可控的润滑油,从而对挺柱进行压力控制;所述挺柱位于机体的挺柱安装孔内,上端与推杆抵顶,下端与凸轮轴抵顶;所述油压控制阀与挺柱连通。本发明能够采用油压控制气阀组件中推杆的升程,控制原理简单,可靠性能好。(The invention relates to the technical field of internal combustion engines, in particular to a lift controllable hydraulic tappet system, which comprises: tappets and oil pressure control valves; the tappet is used for controlling the lift of a push rod of the air valve assembly through a cam shaft and an oil pressure control valve; the oil pressure control valve is used for conveying lubricating oil with controllable pressure to the tappet so as to control the pressure of the tappet; the tappet is positioned in a tappet mounting hole of the machine body, the upper end of the tappet abuts against the push rod, and the lower end of the tappet abuts against the cam shaft; the oil pressure control valve is communicated with the tappet. The invention can adopt oil pressure to control the lift of the push rod in the air valve assembly, and has simple control principle and good reliability.)
1. A lift controllable hydraulic tappet system, comprising: a tappet (1) and an oil pressure control valve (2);
the tappet (1) is used for controlling the lift of a push rod (5) of the air valve assembly through a cam shaft (4) and an oil pressure control valve (2);
the oil pressure control valve (2) is used for conveying lubricating oil with controllable pressure to the tappet (1) so as to control the pressure of the tappet (1);
the tappet (1) is positioned in a tappet mounting hole of the machine body (3), the upper end of the tappet is abutted against the push rod (5), and the lower end of the tappet is abutted against the cam shaft (4);
the oil pressure control valve (2) is communicated with the tappet (1).
2. Lift-controllable hydraulic tappet system according to claim 1, wherein said tappet (1) comprises: a plunger (13), a tappet body (19) and a ball seat (111);
the tappet body (19) is a shell device of the tappet (1), is hollow inside and has an opening structure at the upper end, the tappet mounting hole is matched in shape, and the lower end of the tappet body is propped against the camshaft (4);
the plunger (13) is arranged in the supporting body (19) and can slide up and down along the inner wall of the supporting body (19);
the ball seat (111) is arranged at the upper end of the plunger (13) and is propped against the push rod (5);
a high-pressure oil cavity (124) is formed between the lower end of the plunger (13) and the lower end of the inner wall of the supporting body (19);
when the pressure within the high-pressure oil chamber (124) is below a predetermined threshold:
the camshaft (4) pushes the support body (19) to rise to contact the bottom of the plunger (13), and then the plunger (13) can be driven to rise to push the push rod (5);
when the pressure within the high-pressure oil chamber (124) is above a predetermined threshold:
the camshaft (4) pushes the support body (19) and simultaneously drives the plunger (13) to ascend to push the push rod (5).
3. Lift-controllable hydraulic tappet system according to claim 2, wherein the oil control valve (2) connects the tappet (1) with the engine main oil gallery;
the oil pressure control valve (2) sends lubricating oil in the main oil duct of the engine into the tappet (1), and controls the pressure in the high-pressure oil cavity (124) by controlling the oil pressure of the sent lubricating oil;
when the oil pressure of the lubricating oil fed into the oil pressure control valve (2) is less than the oil pressure of the lubricating oil in the main oil gallery:
the main oil gallery is always communicated with a high-pressure oil cavity (124), and the pressure in the high-pressure oil cavity (124) is lower than a preset threshold value;
when the oil pressure of the lubricating oil fed into the oil pressure control valve (2) is equal to the oil pressure of the lubricating oil in the main oil gallery:
the main oil gallery is communicated with the high-pressure oil cavity (124) and is sealed to the high-pressure oil cavity (124), and the pressure in the sealed high-pressure oil cavity (124) is higher than a preset threshold value.
4. Lift-controllable hydraulic tappet system according to claim 3, wherein said tappet (1) further comprises: an actuator piston (14) and a check valve (17);
the plunger (13) is of an internal hollow structure;
the execution piston (14) is arranged in the upper part of the plunger (13);
the one-way valve (17) is arranged in the lower part of the plunger (13);
the lower part of the plunger (13) where the one-way valve (17) is positioned is communicated with a high-pressure oil chamber (124);
the execution piston (14) can slide up and down along the inner wall of the upper part of the plunger (13), and the lower end of the execution piston and the lower end of the upper part of the plunger (13) form an execution cavity (123);
the execution by chamber (123) is communicated with the oil pressure control valve (2);
when the oil pressure of the lubricating oil fed into the oil pressure control valve (2) is less than the oil pressure of the lubricating oil in the main oil gallery:
the bottom of the execution piston (14) is abutted against the top of the one-way valve (17) so that the execution by cavity (123) is communicated with the high-pressure oil cavity (124);
when the oil pressure of the lubricating oil fed into the oil pressure control valve (2) is equal to the oil pressure of the lubricating oil in the main oil gallery:
the bottom of the actuator piston (14) is separated from the top of a check valve (17), the check valve (17) sealing a high-pressure oil chamber (124).
5. Lift-controllable hydraulic tappet system according to claim 4, wherein the outer wall of the tappet body (19) is provided with a first annular oil groove (117);
a second annular oil groove (113) is formed in the outer wall of the upper part of the plunger (13);
a first oil hole (116) is formed in the first annular oil groove (117), so that the first annular oil groove (117) is communicated with the second annular oil groove (113);
a second oil hole (114) is formed in the second annular oil groove (113), so that the second annular oil groove (113) is communicated with the execution by cavity (123);
the first annular oil groove (117) is communicated with the oil pressure control valve (2) through a first oil passage (31) on the machine body (3).
6. Lift-controllable hydraulic tappet system according to claim 4, wherein said one-way valve (17) comprises: a steel ball (119), a steel ball return spring (120) and a plug cover (122);
the blocking cover (122) is fixedly arranged at the bottom end of the lower part of the plunger (13);
the steel ball (119) is connected with the blocking cover (122) through a steel ball return spring (120);
a third oil hole (18) is formed in the side wall of the lower part of the plunger (13), so that the lower part of the plunger (13) is communicated with the high-pressure oil cavity (124);
a guide hole (15) is arranged between the upper part and the lower part of the plunger (13);
the bottom of the actuating piston (14) can penetrate through the guide hole (15) to be propped against the top of the steel ball (119);
a plurality of oil grooves (118) are vertically arranged on the inner wall of the guide hole (15) along the circumferential direction and are used for communicating the execution oil-passing cavity (123) with the high-pressure oil cavity (124);
when the bottom of the actuating piston (14) is abutted against the top of the steel ball (119), each oil groove (118) is conducted;
after the bottom of the actuating piston (14) is separated from the top of the steel ball (119), each oil groove (118) is blocked by the steel ball (119).
7. Lift-controllable hydraulic tappet system according to claim 6, characterised in that the top of the actuator piston is connected to the bottom of the ball seat (111) via a piston pressure limiting spring (12);
a limiting snap spring (11) is arranged above the ball seat (111) and at the top end of the supporting body (19) and used for limiting the position of the plunger (13) in the supporting body (19);
when the oil pressure of the lubricating oil fed into the oil pressure control valve (2) is less than the oil pressure of the lubricating oil in the main oil gallery:
the oil pressure in the execution slave cavity (123) is lower than the opening pressure of the execution piston (14), and the piston pressure limiting spring (12) extends to enable the bottom of the execution piston (14) to be propped against the top of the steel ball (119);
when the oil pressure of the lubricating oil fed into the oil pressure control valve (2) is equal to the oil pressure of the lubricating oil in the main oil gallery:
the oil pressure in the actuating chamber (123) is higher than the opening pressure of the actuating piston (14), and the piston pressure limiting spring (12) contracts to separate the bottom of the actuating piston (14) from the top of the steel ball (119).
8. Lift-controllable hydraulic tappet system according to claim 3, wherein said oil control valve (2) comprises: a housing (21), a first channel, a second channel and a control device;
the first channel, the second channel and the control device are all arranged in a shell (21);
the first channel and the second channel are provided with the same inlet and are communicated with the main oil gallery of the engine;
the outlet of the first channel is communicated with the tappet (1);
the outlet of the second passage communicates with the outside of the housing (21);
the control device is respectively connected with the first channel and the second channel and is used for controlling the opening or closing of the second channel so as to control the oil pressure of the lubricating oil in the first channel;
when the second channel is opened, the oil pressure of the lubricating oil in the first channel is smaller than that of the lubricating oil in the main oil duct;
when the second passage is closed, the oil pressure of the lubricating oil in the first passage is equal to the oil pressure of the lubricating oil in the main oil gallery.
9. The lift-controllable hydraulic lifter system of claim 8, wherein the control device includes: a control piston (22) and a control piston rebound spring (28);
a through hole structure is arranged in the shell (21) in the horizontal direction;
the control piston (22) is arranged in a through hole structure, and the through hole structure is divided into a part communicated with the tappet (1) and a part communicated with the outside of the shell (21);
the control piston rebound spring (28) is arranged in a part outside the communication shell (21) and is used for pushing and pulling the control piston (22) to move along the horizontal direction;
when the second passage is open, the control piston rebound spring (28) compresses, narrowing the first passage;
when the second passage is closed, the control piston rebound spring (28) expands to maximize the first passage;
an oil inlet channel (26) is formed in the shell (21) in the vertical direction;
one end of the oil inlet channel (26) is provided with an engine main oil channel, and the other end of the oil inlet channel is communicated with a part communicated with the tappet (1);
a branch passage is branched at the middle part of the oil inlet passage (26);
one end of the branch passage is communicated with one end of the oil inlet passage (26), and the other end of the branch passage is communicated with the part communicated with the outside of the shell (21);
whereby, the first channel comprises: an oil inlet channel (26) and a part communicated with the tappet (1);
the second channel, comprising: one end of the oil inlet channel (26) and the branch channel.
10. The lift-controllable hydraulic lifter system of claim 9, wherein the control device further comprises: controlling a needle valve (210) and a solenoid valve (212);
the control needle valve (210) and the electromagnetic valve (212) are arranged in a part communicated with the outside of the shell (21);
when the solenoid valve (212) is not energized:
the second channel is always opened, and the sum of the oil pressure of the lubricating oil in the first channel and the oil pressure of the lubricating oil in the second channel is equal to the oil pressure of the lubricating oil in the main oil duct;
when the solenoid valve (212) is energized:
the control needle valve (210) seals the second channel, and the oil pressure of lubricating oil in the first channel is equal to that of lubricating oil in the main oil gallery.
Technical Field
The invention relates to the technical field of internal combustion engines, in particular to a lift-controllable hydraulic tappet system.
Background
In order to convert the rotational motion of a camshaft into linear motion for pushing an air valve in an engine valve actuating mechanism, a tappet is generally arranged in the valve actuating mechanism. The existing tappet is mainly divided into a mechanical tappet and a hydraulic tappet, wherein the hydraulic tappet can effectively eliminate an air valve gap reserved in a valve actuating mechanism, so that the movement noise of the valve actuating mechanism is reduced, and the mechanism efficiency is improved.
With the rapid development of science and technology, the main technology for improving the inflating efficiency of an engine and realizing the auxiliary braking function of a heavy-duty engine is to change the lift of a gas valve and the opening and closing time of the gas valve in the movement process of a gas distribution mechanism, and the core of the technology lies in how to realize the controllability of the lift of the gas valve in the gas distribution mechanism. Although the traditional hydraulic tappet can effectively eliminate the air valve clearance reserved in the air distribution mechanism, the lift of an air valve cannot be controlled.
Disclosure of Invention
The lift-controllable hydraulic tappet system provided by the invention can adopt oil pressure to control the lift of the push rod in the air valve assembly, and has the advantages of simple control principle and good reliability.
The invention provides a lift-controllable hydraulic tappet system, which is characterized by comprising the following components: tappets and oil pressure control valves;
the tappet is used for controlling the lift of a push rod of the air valve assembly through a cam shaft and an oil pressure control valve;
the oil pressure control valve is used for conveying lubricating oil with controllable pressure to the tappet so as to control the pressure of the tappet;
the tappet is positioned in a tappet mounting hole of the machine body, the upper end of the tappet abuts against the push rod, and the lower end of the tappet abuts against the cam shaft;
the oil pressure control valve is communicated with the tappet.
Further, the tappet includes: a plunger, a tappet body and a ball seat;
the tappet body is a tappet shell device and has a hollow inner structure with an opening at the upper end, the tappet mounting hole is matched in shape, and the lower end of the tappet body is abutted against the camshaft;
the plunger is arranged in the supporting body and can slide up and down along the inner wall of the supporting body;
the ball seat is arranged at the upper end of the plunger and is propped against the push rod;
a high-pressure oil cavity is formed between the lower end of the plunger and the lower end of the inner wall of the supporting body;
when the pressure in the high pressure oil chamber is below a predetermined threshold:
the camshaft pushes the supporting body to rise to contact the bottom of the plunger, and then the camshaft can drive the plunger to rise to push the push rod;
when the pressure in the high pressure oil chamber is higher than a predetermined threshold:
the camshaft drives the plunger to ascend to push the push rod while pushing the support body.
Further, the oil pressure control valve communicates the tappet with the engine main oil gallery;
the oil pressure control valve sends lubricating oil in the main oil duct of the engine into the tappet and controls the pressure in the high-pressure oil cavity by controlling the oil pressure sent into the lubricating oil;
when the oil pressure of the lubricating oil fed into the oil pressure control valve is less than the oil pressure of the lubricating oil in the main oil gallery:
the main oil duct is always communicated with a high-pressure oil cavity, and the pressure in the high-pressure oil cavity is lower than a preset threshold value;
when the oil pressure of the lubricating oil fed into the oil pressure control valve is equal to the oil pressure of the lubricating oil in the main oil gallery:
the main oil duct and the high-pressure oil cavity are communicated to the high-pressure oil cavity to be sealed, and the pressure in the high-pressure oil cavity is higher than a preset threshold value after sealing.
Still further, the tappet still includes: an actuator piston and a check valve;
the plunger is of an internal hollow structure;
the execution piston is arranged in the upper part of the plunger;
the one-way valve is arranged in the lower part of the plunger;
the lower part of the plunger at which the one-way valve is positioned is communicated with the high-pressure oil cavity;
the execution piston can slide up and down along the inner wall of the upper part of the plunger, and an execution cavity is formed by the lower end of the execution piston and the lower end of the upper part of the plunger;
the execution by cavity is communicated with the oil pressure control valve;
when the oil pressure of the lubricating oil fed into the oil pressure control valve is less than the oil pressure of the lubricating oil in the main oil gallery:
the bottom of the execution piston is abutted against the top of the one-way valve, so that the execution slave cavity is communicated with the high-pressure oil cavity;
when the oil pressure of the lubricating oil fed into the oil pressure control valve is equal to the oil pressure of the lubricating oil in the main oil gallery:
the bottom of the actuator piston is separated from the top of a check valve that seals the high pressure oil chamber.
Still further, a first annular oil groove is formed in the outer wall of the supporting body;
a second annular oil groove is formed in the outer wall of the upper part of the plunger;
the first annular oil groove is provided with a first oil hole, so that the first annular oil groove is communicated with the second annular oil groove;
the second annular oil groove is provided with a second oil hole, so that the second annular oil groove is communicated with the execution by cavity;
the first annular oil groove is communicated with the oil pressure control valve through a first oil duct on the machine body.
In the above technical solution, the check valve includes: the steel ball, the steel ball return spring and the plug cover;
the plug cover is fixedly arranged at the bottom end of the lower part of the plunger;
the steel ball is connected with the blocking cover through a steel ball return spring;
a third oil hole is formed in the side wall of the lower portion of the plunger, so that the lower portion of the plunger is communicated with the high-pressure oil cavity;
a guide hole is formed between the upper part and the lower part of the plunger;
the bottom of the execution piston can penetrate through the guide hole to abut against the top of the steel ball;
a plurality of oil grooves are vertically formed in the inner wall of the guide hole along the circumferential direction and are used for communicating the execution by cavity with the high-pressure oil cavity;
when the bottom of the execution piston is abutted against the top of the steel ball, all the oil grooves are communicated;
when the bottom of the actuating piston is separated from the top of the steel ball, each oil groove is blocked by the steel ball.
Further, the top of the actuating piston is connected with the bottom of the ball seat through a piston pressure limiting spring;
a limiting snap spring is arranged above the ball seat and at the top end of the supporting body and used for limiting the position of the plunger in the supporting body;
when the oil pressure of the lubricating oil fed into the oil pressure control valve is less than the oil pressure of the lubricating oil in the main oil gallery:
the oil pressure in the execution cavity is lower than the opening pressure of the execution piston, and the piston pressure limiting spring extends to enable the bottom of the execution piston to be abutted against the top of the steel ball;
when the oil pressure of the lubricating oil fed into the oil pressure control valve is equal to the oil pressure of the lubricating oil in the main oil gallery:
the oil pressure in the execution cavity is higher than the opening pressure of the execution piston, and the piston pressure limiting spring contracts to separate the bottom of the execution piston from the top of the steel ball.
In the above technical solution, the oil pressure control valve includes: the device comprises a shell, a first channel, a second channel and a control device;
the first channel, the second channel and the control device are all arranged in the shell;
the first channel and the second channel are provided with the same inlet and are communicated with the main oil gallery of the engine;
the outlet of the first channel is communicated with the tappet;
the outlet of the second channel is communicated with the outside of the shell;
the control device is respectively connected with the first channel and the second channel and is used for controlling the opening or closing of the second channel so as to control the oil pressure of the lubricating oil in the first channel;
when the second channel is opened, the oil pressure of the lubricating oil in the first channel is smaller than that of the lubricating oil in the main oil duct;
when the second passage is closed, the oil pressure of the lubricating oil in the first passage is equal to the oil pressure of the lubricating oil in the main oil gallery.
Further, the control device includes: a control piston and a control piston rebound spring;
a through hole structure is arranged in the shell in the horizontal direction;
the control piston is arranged in the through hole structure, and the through hole structure is divided into a part communicated with the tappet and a part communicated with the outside of the shell;
the control piston rebound spring is arranged in a part communicated with the outside of the shell and used for pushing and pulling the control piston to move along the horizontal direction;
when the second passage is open, the control piston rebound spring compresses, narrowing the first passage;
when the second passage is closed, the control piston rebound spring is expanded to maximize the first passage;
an oil inlet channel is formed in the shell in the vertical direction;
one end of the oil inlet channel is provided with an engine main oil channel, and the other end of the oil inlet channel is communicated with a part communicated with the tappet;
a branch passage is arranged in the middle branch of the oil inlet passage;
one end of the branch passage is communicated with one end of the oil inlet passage, and the other end of the branch passage is communicated with the part communicated with the outside of the shell;
whereby, the first channel comprises: an oil inlet channel and a part communicated with the tappet;
the second channel, comprising: one end of the oil inlet channel and the branch channel.
Still further, the control device further includes: controlling a needle valve and an electromagnetic valve;
the control needle valve and the electromagnetic valve are arranged in a part communicated with the outside of the shell;
when the solenoid valve is not energized:
the second channel is always opened, and the sum of the oil pressure of the lubricating oil in the first channel and the oil pressure of the lubricating oil in the second channel is equal to the oil pressure of the lubricating oil in the main oil duct;
when the electromagnetic valve is electrified:
the control needle valve plugs the second channel, and the oil pressure of the lubricating oil in the first channel is equal to that of the lubricating oil in the main oil duct.
According to the invention, the lift of the tappet is controlled by oil pressure through an oil pressure control valve, and the control of the lift of the air valve can be realized by matching with a cam shaft with a specially-made cam profile, and the engine braking function of a heavy-duty engine can also be realized. The invention has simple control principle and good reliability, and the lift can be controlled on line in real time.
Drawings
FIG. 1 is a schematic illustration of a structure for a brace in an embodiment of the invention;
FIG. 2 is a schematic diagram of an oil pressure control valve according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of the solenoid valve of the present invention when it is not energized;
fig. 4 is a schematic structural diagram of the electromagnetic valve in the embodiment of the invention when the electromagnetic valve is electrified.
In the figure: the tappet 1 (wherein: a limit clamp spring 11, a piston pressure limiting spring 12, a plunger 13, an execution piston 14, a guide hole 15, a sealing belt 16, a one-way valve 17, a third oil hole 18, a support body 19, a pressure balancing hole 110, a ball seat 111, a limit boss 112, a second annular oil groove 113, a second oil hole 114, a thimble 115, a first oil hole 116, a first annular oil groove 117, an oil groove 118, a steel ball 119, a steel ball return spring 120, a plunger return spring 121, a blocking cover 122, an execution oil chamber 123, a high-pressure oil chamber 124), an oil control valve 2 (wherein: a housing 21, a control piston 22, an oil outlet 23, a fourth oil hole 24, a third annular oil groove 25, an oil inlet passage 26, a second oil passage 27, a control piston return spring 28, a spring base 29, a control needle valve 210, an oil benefiting hole 211, the solenoid valve 212, the drain hole 213, the third oil passage 214, the plug 215, the restriction hole 216), the body 3 (wherein: first oil passage 31), cam 4, and pushrod 5.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
as shown in fig. 1 and 2, the present embodiment provides a lift-controllable hydraulic tappet system including: a
the
the oil pressure control valve 2 is used for conveying lubricating oil with controllable pressure to the
the
the oil pressure control valve 2 is communicated with the
In the present embodiment, as shown in fig. 3 and 4, the present embodiment is mainly composed of two parts, i.e., a
In the embodiment, the lift of the
The
the supporting
the
the
a high-
when the pressure within the high-
the
when the pressure within the high-
the
The oil pressure control valve 2 is used for communicating the
the oil pressure control valve 2 sends the lubricating oil in the main oil gallery of the engine into the
when the oil pressure of the lubricating oil fed into the oil pressure control valve 2 is less than the oil pressure of the lubricating oil in the main oil gallery:
the main oil gallery is always communicated with a high-
when the oil pressure of the lubricating oil fed into the oil pressure control valve 2 is equal to the oil pressure of the lubricating oil in the main oil gallery:
the main oil passage and the high-
The
the
the
the one-
the lower part of the
the
the execution by
when the oil pressure of the lubricating oil fed into the oil pressure control valve 2 is less than the oil pressure of the lubricating oil in the main oil gallery:
the bottom of the
when the oil pressure of the lubricating oil fed into the oil pressure control valve 2 is equal to the oil pressure of the lubricating oil in the main oil gallery:
the bottom of the
In the present embodiment, the main principle is to control the pressure of the lubricating oil entering the
A first
a second
the first
a
the first
The
the
the
a
a
the bottom of the
a plurality of
when the bottom of the
when the bottom of the
The top of the actuating piston is connected with the bottom of the
a limiting
when the oil pressure of the lubricating oil fed into the oil pressure control valve 2 is less than the oil pressure of the lubricating oil in the main oil gallery:
the oil pressure in the
when the oil pressure of the lubricating oil fed into the oil pressure control valve 2 is equal to the oil pressure of the lubricating oil in the main oil gallery:
the oil pressure in the
As shown in fig. 1, the
The small cylinder at the lower part of the
The big and small cylinder junction of
The
The
An actuator piston assembly comprising: the actuating
The piston
The assembling relation among the components of the
the
As shown in fig. 2, the oil pressure control valve 2 includes: a
the first channel, the second channel and the control device are all arranged in the
the first channel and the second channel are provided with the same inlet and are communicated with the main oil gallery of the engine;
the outlet of the first channel is communicated with the
the outlet of the second passage communicates with the outside of the
the control device is respectively connected with the first channel and the second channel and is used for controlling the opening or closing of the second channel so as to control the oil pressure of the lubricating oil in the first channel;
when the second channel is opened, the oil pressure of the lubricating oil in the first channel is smaller than that of the lubricating oil in the main oil duct;
when the second passage is closed, the oil pressure of the lubricating oil in the first passage is equal to the oil pressure of the lubricating oil in the main oil gallery.
The control device includes: a control piston 22 and a control
a through hole structure is arranged in the
the control piston 22 is installed in a through hole structure, and the through hole structure is divided into a part communicated with the
the control
when the second passage is open, the control
when the second passage is closed, the control
an oil inlet channel 26 is formed in the
one end of the oil inlet channel 26 is an engine main oil channel, and the other end of the oil inlet channel is communicated with the part communicated with the
a branch passage is branched at the middle part of the oil inlet passage 26;
one end of the branch passage is communicated with one end of the oil inlet passage 26, and the other end is communicated with the part communicated with the outside of the
whereby, the first channel comprises: an oil inlet passage 26 and a portion communicating with the
the second channel, comprising: one end of the oil inlet passage 26 and the branch passage.
The control device further includes: control needle valve 210 and
the control needle valve 210 and the
when the
the second channel is always opened, and the sum of the oil pressure of the lubricating oil in the first channel and the oil pressure of the lubricating oil in the second channel is equal to the oil pressure of the lubricating oil in the main oil duct;
when the
the control needle valve 210 closes the second passage, and the oil pressure of the lubricating oil in the first passage is equal to the oil pressure of the lubricating oil in the main oil gallery.
As shown in fig. 2, in the present embodiment, the oil pressure control valve 2 mainly includes:
The
A third annular oil groove 25 is provided at the joint of the piston mounting hole and the oil inlet passage 26. A second oil passage 27 is branched on the oil inlet passage 26. One end of the second oil passage 27 is communicated with the oil inlet passage 26, the middle part of the second oil passage is provided with a flow limiting hole 216, and the other end of the second oil passage is sealed by a plug 215.
A third oil passage 214 is provided between the metering orifice 216 of the second oil passage 27 and the plug 215, and one end of the third oil passage 214 communicates with the second oil passage 27 and the other end communicates with the control piston mounting hole.
The control piston 22 is an internal hollow cylindrical structure with an opening at one end, and a plurality of fourth oil holes 24 are circumferentially distributed in the middle of the control piston 22. The control piston 22 has an open end facing the
The control
The
When the oil drain hole 213 is opened, the second passage is opened; when the oil release hole 213 is closed, the second passage is closed.
In the present embodiment, the working principle is as follows:
taking the viewing angles shown in fig. 3 and 4 as an example: lubricating oil with certain pressure from the main oil gallery of the engine enters from the yoke oil inlet passage 26 of the oil pressure control valve 2 and is divided into two branches in the oil inlet passage 26, and one branch enters the control piston 22 from the third annular oil gallery 25 at the mounting hole of the control piston and the fourth oil hole 24 on the control piston and flows out from the oil outlet hole 23 and enters the
When the
When the
Lubricating oil supplied from the oil control valve enters the
As shown in fig. 3, when the system is not operating, the
When the
As shown in fig. 4, when the system is in operation, the
The beneficial effect of this embodiment lies in:
1. the system function is relatively independent, but the appearance characteristic is basically consistent with that of the traditional tappet, and the matrix structure of the traditional machine type is not required to be changed when the functions are changed and upgraded on the traditional machine type;
2. the lift of the tappet is controlled by adopting oil pressure, the control principle is simple, the reliability is good, and the lift can be controlled on line in real time;
3. the control system adopts an electronic oiling pressure control mode, is simple in structure and does not need a special mechanical device, a special driving oil duct and the like;
4. the embodiment is like a hydraulic shock absorber in the closing state of the control valve, and can effectively reduce the noise generated by the air valve clearance in the air distribution mechanism;
5. the embodiment can realize the control of the lift of the air valve by matching with a cam shaft with a specially-made cam profile and can also realize the engine braking function of a heavy-duty engine.
It should be understood that the specific order or hierarchy of steps in the processes disclosed is an example of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not intended to be limited to the specific order or hierarchy presented.
In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, invention lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. To those skilled in the art; various modifications to these embodiments will be readily apparent, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "includes" is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when employed as a transitional word in a claim. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or".
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
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