CN210564691U

CN210564691U - Piezoelectric crystal control type fully-variable electro-hydraulic valve device

Info

Publication number: CN210564691U
Application number: CN201921072235.6U
Authority: CN
Inventors: 张嘉诚; 张光德
Original assignee: Wuhan University of Science and Engineering WUSE
Current assignee: Wuhan University of Science and Engineering WUSE
Priority date: 2019-07-10
Filing date: 2019-07-10
Publication date: 2020-05-19
Anticipated expiration: 2029-07-10

Abstract

The utility model discloses a piezoelectric crystal control formula full variable electricity liquid valve gear, including first pneumatic cylinder, a drive uni, the hyperbaric chamber, the pressure accumulation room, the piezoelectric crystal valve, second pneumatic cylinder and (air) intake valve, first pneumatic cylinder include the piston rod and with the fixed piston of piston rod, drive uni drive piston rod removes, first hydraulic chamber and hyperbaric chamber are through first oil duct intercommunication, the hyperbaric chamber passes through the second oil duct intercommunication with the pressure accumulation room, the second oil duct passes through piezoelectric crystal valve control switching, the hyperbaric chamber passes through the third oil duct intercommunication with the second pneumatic cylinder, the second pneumatic cylinder includes the valve stem and with the fixed air intake valve piston of valve stem, the valve stem stretches out from the second pneumatic cylinder and is connected with the (air) intake valve. The utility model aims at providing a piezoelectric crystal control formula full variable electricity liquid valve gear through piezoelectric crystal valve control full variable valve mechanism, makes good dynamic response and the stable work operation situation that it had.

Description

Piezoelectric crystal control type fully-variable electro-hydraulic valve device

Technical Field

The utility model relates to an engine valve mechanism field, concretely relates to piezoelectric crystal control formula full variable electricity liquid valve gear.

Background

The Fully Variable Valve System (FVVS) can realize continuous variation of the maximum lift of the Valve, the opening continuous angle of the Valve and the Valve timing, and has important significance for energy conservation and emission reduction of the engine. The FVVS can adopt the mode of early closing of the inlet valve (EIVC) to control the working medium quantity entering the cylinder, thereby canceling the throttle valve, the gasoline engine without the throttle valve can greatly reduce the pumping loss, and the fuel consumption in medium and small loads is reduced.

At present, a more advanced foreign fully-variable valve mechanism is a MultiAir (also known as a UniAir) system developed by combining Schfler and Feiyat, the system adopts a camshaft-driven electro-hydraulic valve mechanism, and the valve motion law is controlled by combining a camshaft and an electromagnetic valve. The working principle of the system is as follows: the hydraulic piston is pushed by the cam and is connected with the driving piston through a hydraulic cavity, and the hydraulic cavity is controlled by a switch type electromagnetic valve. When the electromagnetic valve is in a completely closed state, the hydraulic piston pushes the driving piston through the hydraulic pressure to transmit the hydraulic pressure generated by the rotation of the cam to the air valve; the intake valve is now fully cam controlled and in an open state. When the electromagnetic valve is in a fully open state, the liquid pressure can not transmit the driving force, the hydraulic piston can not push the driving piston, and the intake valve is no longer controlled by the cam and is in a fall-back or closed state. By controlling the opening and closing time of the electromagnetic valve, various different valve motion laws can be realized, and the function of the fully variable valve mechanism is realized. However, the electromagnetic valve has a complex structure and is expensive, and the electromagnetic valve inevitably has electromagnetic time delay, so that the popularization and the application of the technology are limited.

In recent years, piezoelectric crystals are increasingly applied to high-frequency controllers, and have good dynamic response and stable working operation conditions, which are superior to those of traditional solenoid valves in specific working conditions.

SUMMERY OF THE UTILITY MODEL

According to prior art's not enough, the utility model aims at providing a piezoelectric crystal control formula is variable electric liquid valve gear entirely, replaces traditional solenoid valve with the piezoelectric crystal valve and uses in the valve train of entirely variable, promotes the stability of valve train dynamic response and the working operation situation of entirely variable.

In order to solve the technical problem, the utility model discloses a technical scheme be:

a piezoelectric crystal control type fully-variable electro-hydraulic valve device comprises a first hydraulic cylinder, a driving device, a high-pressure chamber, a pressure accumulation chamber, a piezoelectric crystal valve, a second hydraulic cylinder and an inlet valve, wherein the first hydraulic cylinder comprises a piston rod and a piston fixed with the piston rod, the driving device comprises a cam, a steering wheel and a fixed base, the steering wheel is rotatably connected onto the fixed base, the cam is in contact with one end of the steering wheel, the other end of the steering wheel is fixed with the piston rod so as to drive the piston rod to move, the high-pressure chamber comprises a first oil port, a second oil port and a third oil port, the first oil port of the first hydraulic chamber is communicated with the first oil port of the high-pressure chamber through a first oil duct, the second oil port of the high-pressure chamber is communicated with the pressure accumulation chamber through a second oil duct, and the second oil duct controls the opening and closing, and a third oil port of the high-pressure chamber is communicated with a second hydraulic cylinder through a third oil duct, the second hydraulic cylinder comprises a valve stem and an intake valve piston fixed with the valve stem, and the valve stem extends out of the second hydraulic cylinder and is connected with the intake valve.

Furthermore, a return spring is sleeved on the piston rod, one end of the return spring is fixed with the cylinder body of the first hydraulic cylinder, and the other end of the return spring is fixed with the piston rod.

Further, the steering wheel is triangle-shaped platelike structure, the three angle department of steering wheel is fixed with primary shaft, secondary shaft and third axle respectively, the cover is equipped with first bearing on the primary shaft, the outer lane of first bearing with the cam contact, the cover is equipped with the secondary shaft on the secondary shaft, the outer lane of secondary shaft with the hydraulic stem of first pneumatic cylinder is fixed, the cover is equipped with the third bearing on the third axle, the outer lane of third bearing with unable adjustment base clearance fit.

Further, the first shaft is in interference connection with the steering wheel.

Further, the second shaft is in interference connection with the steering wheel.

Further, the third shaft is in interference connection with the steering wheel.

Furthermore, the middle part of the valve stem is kept away from the second hydraulic cylinder is sequentially provided with a spring baffle, a valve spring and a spring base, the spring baffle is fixed on the valve stem, the spring base is sleeved on the valve stem and is in clearance fit with the valve stem, one end of the valve spring is connected with the spring baffle, and the other end of the valve spring is connected with the spring base

Furthermore, a flange is fixed on the outer portion of the second hydraulic cylinder, and a sealing ring sleeved on the outer portion of the second hydraulic cylinder is arranged below the flange.

Furthermore, a first sliding sleeve is arranged on the inner wall of the first hydraulic cylinder.

Furthermore, a second sliding sleeve is arranged on the inner wall of the second hydraulic cylinder.

Compared with the prior art, the utility model has the advantages of it is following and beneficial effect:

1. a piezoelectric crystal control formula full variable electricity liquid valve gear, replace traditional solenoid valve with the piezoelectric crystal valve and use to full variable valve mechanism in, promote the stability of full variable valve mechanism dynamic response and working operation situation.

2. A piezoelectric crystal control formula full variable electricity liquid valve gear, through setting up reset spring, when can making drive arrangement not transmit power, the piston rod return of first pneumatic cylinder.

3. A piezoelectric crystal control formula full variable electricity liquid valve gear, can control closing of piezoelectric crystal valve and open the mode of opening that can realize multiple (air) intake valve very conveniently according to the time to reach the full variable purpose of realization (air) intake valve.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a cross-sectional view of the hydraulic control assembly of the present invention;

figure 3 is a cross-sectional view of the intake valve assembly of the present invention.

Wherein: 1. a first hydraulic cylinder; 101. a piston rod; 102. a piston; 2. a drive device; 201. a cam; 202. a steering wheel; 203. a fixed base; 204. a first shaft; 205. a second shaft; 206. a third axis; 207. a first bearing; 208. a second bearing; 209. a third bearing; 3. a high pressure chamber; 301. a first oil port; 302. a second oil port; 303. a third oil port; 4. a pressure accumulation chamber; 5. a piezoelectric crystal valve; 6. a second hydraulic cylinder; 601. an intake valve piston; 602. a valve stem; 7. an intake valve; 8. a return spring; 9. a first oil passage; 10. a second oil passage; 11. a third oil passage; 12. a spring baffle; 13. a valve spring; 14. a spring mount; 15. a flange; 16. a seal ring; 17. a first sliding sleeve; 18. and the second sliding sleeve.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

Referring to fig. 1 to 3, a piezoelectric crystal control type fully variable electro-hydraulic valve device includes a first hydraulic cylinder 1, a driving device 2, a high pressure chamber 3, an accumulator chamber 4, a piezoelectric crystal valve 5, a second hydraulic cylinder 6, and an intake valve 7. The first hydraulic cylinder 1 includes a piston rod 101 and a piston 102, and the left end of the piston rod 101 is fixed to the piston 102. The driving device 2 comprises a cam 201, a steering wheel 202 and a fixed base 203, wherein the steering wheel 202 is rotatably connected to the fixed base 203, the cam 201 is in contact with one end of the steering wheel 202, and the other end of the steering wheel 202 is fixed with the right end of the piston rod 101 so as to drive the piston rod 101 to move. The high-pressure chamber 3 comprises a first oil port 301, a second oil port 302 and a third oil port 303, the first hydraulic cylinder 1 is communicated with the first oil port 301 of the high-pressure chamber 3 through a first oil duct 9, the second oil port 302 of the high-pressure chamber 3 is communicated with the pressure accumulation chamber 4 through a second oil duct 10, the second oil duct 10 is controlled to be opened or closed through a piezoelectric crystal valve 5, the third oil port 303 of the high-pressure chamber 3 is communicated with the second hydraulic cylinder 6 through a third oil duct 11, the second hydraulic cylinder 6 comprises an intake valve piston 601 and a valve stem 602, the upper end of the valve stem 602 is fixed with the upper end of the intake valve piston 601, and the lower end of the valve stem 602 extends out of the second hydraulic cylinder 6 and is fixedly connected with the intake valve.

In the using process, the cam 201 is driven to rotate by the motor, the force generated by the movement of the cam 201 is transmitted to the piston rod 101 of the first hydraulic cylinder 1 through the steering wheel 202, the hydraulic oil in the first hydraulic cylinder 1 enters the high-pressure chamber 3 through the first oil duct 9, when the piezoelectric crystal valve 5 is opened, the piston 102 of the first hydraulic cylinder 1 moves, the hydraulic oil in the high-pressure chamber 3 enters the pressure accumulation chamber 4 through the second oil duct 10, the connection between the high-pressure chamber 3 and the intake valve 7 is disconnected, the force generated by the cam 201 is not transmitted to the intake valve 7, the intake valve 7 is closed, and the pressure accumulation chamber 4 at the low-pressure part of the hydraulic oil loop helps the high-pressure chamber 3 to be filled with the hydraulic oil again to prepare for the. When the piezoelectric crystal valve 5 is closed, the piston 102 of the first hydraulic cylinder 1 moves, the liquid oil in the high-pressure chamber 3 enters the second hydraulic cylinder 6 through the third oil duct 11, and when the liquid oil enters the second hydraulic cylinder 6, the liquid oil pushes the intake valve piston 601 to move, so that the valve stem 602 is driven to move, and the intake valve 7 is driven to move. The opening and closing of the piezoelectric crystal valve are controlled according to time, so that various opening modes of the air inlet valve 7 can be conveniently realized, and the purpose of realizing full-variable air inlet valve 7 is achieved.

The utility model discloses in, can be by the opening or closing of the valve control module production signal control piezoelectric crystal valve 5 in the controller.

Referring to fig. 1, in order to make the cam 201 not transmit force, the piston rod 101 returns, the piston rod 101 is sleeved with a return spring 8, the left end of the return spring 8 is fixed with the cylinder body of the first hydraulic cylinder 1, and the other end is fixed with the right end of the piston rod 101. When the cam 201 does not push the piston rod 101, the piston rod 101 moves rightward, returning to the initial position, due to the return action of the return spring 8.

Referring to fig. 1, the steering wheel 202 is a triangular plate-shaped structure, and a first shaft 204 (not shown), a second shaft 205 (not shown) and a third shaft 206 (not shown) are fixed at three corners of the steering wheel 202. The first bearing 207 is sleeved on the first shaft 204, the inner ring of the first bearing 207 is in interference fit with the first shaft 204, the outer ring of the first bearing 207 is in contact with the cam 201, and the first shaft 204 is in interference connection with the steering wheel 204. The second shaft 205 is sleeved with a second bearing 208, an inner ring of the second bearing 208 is in interference fit with the second shaft 205, an outer ring of the second bearing 208 is fixed with the right end of the piston rod 101, and the second shaft 205 is in interference connection with the steering wheel 202. The third shaft 206 is sleeved with a third bearing 209, an inner ring of the third bearing 209 is in interference fit with the third shaft 206, and an outer ring of the third bearing 209 is in clearance fit with the fixed base 203, so that the third bearing 209 can rotate on the fixed base 203, and the third shaft 206 is in interference connection with the steering wheel 202. When the cam 201 rotates, the cam 201 moves to push the first bearing 207 to rotate, and first drives the first shaft 204 and the steering wheel 202 to move, and further drives the second shaft 205 and the second bearing 208 to move, so as to push the piston rod 101 to move to the left.

Referring to fig. 3, a spring baffle 12, a valve spring 13 and a spring base 14 are sequentially arranged in the middle of a valve stem 602 away from a second hydraulic cylinder 6, the spring baffle 12 is fixed on the valve stem 602, the spring base 14 is sleeved on the valve stem 602 and fixed on a cylinder cover, the valve stem 602 can move up and down in the spring base 14 due to clearance fit of the spring base 14 and the valve stem 602, the upper end of the valve spring 13 is connected with the spring baffle 12, the lower end of the valve spring is connected with the spring base 14, when the piezoelectric crystal valve 5 is opened, force generated by a cam 201 is not transferred to an intake valve 7, and the valve spring 13 can reset the intake valve 7.

Referring to fig. 1 and 3, a flange 15 is fixed outside the second hydraulic cylinder 6, and a sealing ring 16 is provided below the flange 15 and sleeved outside the second hydraulic cylinder 6 to ensure sealing performance.

Referring to fig. 2, in order to ensure the sealing performance in the first hydraulic cylinder 1, a first sliding sleeve 17 is arranged on the inner wall of the first hydraulic cylinder 1, and the first sliding sleeve 17 and a piston 102 in the first hydraulic cylinder 1 form a closed hydraulic chamber.

Referring to fig. 3, in order to ensure the sealing property in the first hydraulic cylinder 1, a second sliding sleeve 18 is provided on the inner wall of the second hydraulic cylinder 6, and the second sliding sleeve 18 and an intake valve piston 601 in the second hydraulic cylinder 6 form a closed hydraulic cavity.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. The utility model provides a piezoelectric crystal control formula full variable electricity liquid valve gear which characterized in that: the hydraulic cylinder comprises a first hydraulic cylinder, a driving device, a high-pressure chamber, a pressure accumulation chamber, a piezoelectric crystal valve, a second hydraulic cylinder and an inlet valve, wherein the first hydraulic cylinder comprises a piston rod and a piston fixed with the piston rod, the driving device comprises a cam, a steering wheel and a fixed base, the steering wheel is rotatably connected to the fixed base, the cam is in contact with one end of the steering wheel, the other end of the steering wheel is fixed with the piston rod to drive the piston rod to move, the high-pressure chamber comprises a first oil port, a second oil port and a third oil port, the first hydraulic chamber is communicated with the first oil port of the high-pressure chamber through a first oil duct, the second oil port of the high-pressure chamber is communicated with the pressure accumulation chamber through a second oil duct, the second oil duct is controlled to be opened and closed through the piezoelectric crystal valve, and the third oil port of the high-pressure chamber is communicated with the second, the second hydraulic cylinder comprises a valve rod and an air inlet valve piston fixed with the valve rod, and the valve rod extends out of the second hydraulic cylinder and is connected with the air inlet valve.

2. The piezoelectric crystal control type fully variable electro-hydraulic valve device according to claim 1, characterized in that: the piston rod is sleeved with a return spring, one end of the return spring is fixed with the cylinder body of the first hydraulic cylinder, and the other end of the return spring is fixed with the piston rod.

3. The piezoelectric crystal control type fully variable electro-hydraulic valve device according to claim 1, characterized in that: the steering wheel is triangle-shaped platelike structure, the three angle department of steering wheel is fixed with primary shaft, secondary shaft and third axle respectively, the cover is equipped with first bearing on the primary shaft, the outer lane of first bearing with the cam contact, the cover is equipped with the secondary bearing on the secondary shaft, the outer lane of secondary bearing with the hydraulic stem of first pneumatic cylinder is fixed, the cover is equipped with the third bearing on the third axle, the outer lane of third bearing with unable adjustment base clearance fit.

4. The piezoelectric crystal controlled fully variable electro-hydraulic valve device according to claim 3, characterized in that: the first shaft is in interference connection with the steering wheel.

5. The piezoelectric crystal controlled fully variable electro-hydraulic valve device according to claim 3, characterized in that: the second shaft is in interference connection with the steering wheel.

6. The piezoelectric crystal controlled fully variable electro-hydraulic valve device according to claim 3, characterized in that: the third shaft is in interference connection with the steering wheel.

7. The piezoelectric crystal control type fully variable electro-hydraulic valve device according to claim 1, characterized in that: the middle part of valve stem is kept away from the second pneumatic cylinder is equipped with spring baffle, valve spring and spring holder in proper order, spring baffle fixes on the valve stem, the spring holder cover is established on the valve stem and with valve stem clearance fit, valve spring's one end with spring baffle connects, the other end with spring holder connects.

8. The piezoelectric crystal controlled fully variable electro-hydraulic valve device according to any one of claims 1 to 7, characterized in that: and a flange is fixed outside the second hydraulic cylinder, and a sealing ring sleeved outside the second hydraulic cylinder is arranged below the flange.

9. The piezoelectric crystal controlled fully variable electro-hydraulic valve device according to any one of claims 1 to 7, characterized in that: and a first sliding sleeve is arranged on the inner wall of the first hydraulic cylinder.

10. The piezoelectric crystal controlled fully variable electro-hydraulic valve device according to any one of claims 1 to 7, characterized in that: and a second sliding sleeve is arranged on the inner wall of the second hydraulic cylinder.