CN113983111A

CN113983111A - Automobile electric control suspension with built-in hydraulic oil way

Info

Publication number: CN113983111A
Application number: CN202111350650.5A
Authority: CN
Inventors: 徐景楼; 孙鹏; 郭静怡; 党文喆
Original assignee: Xi'an Tianyun Electromechanical Equipment Manufacturing Co ltd
Current assignee: Xi'an Tianyun Electromechanical Equipment Manufacturing Co ltd
Priority date: 2021-11-15
Filing date: 2021-11-15
Publication date: 2022-01-28

Abstract

An automobile electric control suspension with a built-in hydraulic oil path is characterized in that an axial through hole is formed in the wall of a hydraulic oil cylinder barrel and serves as the hydraulic oil path, one end of the hydraulic oil path is in butt joint with an oil path inlet hole in a blocking cover of the hydraulic oil cylinder barrel, hydraulic oil in a medium pressure pump is fed into an oil inlet on one side of the bottom end of a piston, the hydraulic oil flows into an upper cavity of the hydraulic cylinder through an upper through hole and a lower through hole in the axial direction of the hydraulic cylinder barrel, and otherwise, the hydraulic oil in the upper cavity of the hydraulic cylinder flows back to an oil tank; through the cooperation between the sleeve blanking cover, the cylinder barrel of the oil cylinder and the sealing ring seat, the oil inlet and the oil outlet are centralized on the oil cylinder blanking cover, and meanwhile, high-pressure oil and low-pressure oil are respectively arranged on two sides of the piston in the hydraulic cylinder, so that stable and reliable pressure difference is formed between two sides of the piston. The invention ensures that the spring cylinder seat is more smoothly matched with the outer diameter of the hydraulic oil cylinder when the pressure hardness of the spring is adjusted, thereby ensuring the consistency with the design size of the original factory shock absorber, improving the interchangeability of the shock absorber on various vehicles and improving the applicability of the vehicles.

Description

Automobile electric control suspension with built-in hydraulic oil way

Technical Field

The invention relates to the field of automobiles, in particular to an automobile electric control suspension with a built-in hydraulic oil way and a method for determining the aperture of the oil way.

Background

The shock absorber mainly adopted by the shock absorption system of the traditional car at present mainly comprises an elastic element, a shock absorber and a guide mechanism, and due to the comprehensive characteristics of the elastic element and the shock absorber, the running performance and the operation performance of the car are influenced, so that the riding comfort and the operation stability cannot be simultaneously met in the traditional suspension of a fixed-stiffness spring and a fixed-damping shock absorber, the optimal compromise of the performance of the car under a certain specific road and speed condition can only be ensured, the acting force of the ground on the car body can only be passively borne, and the acting force cannot be actively controlled. Therefore, in order to overcome the limitations of the conventional shock absorber on its performance, the electronic shock absorber compensates for the above disadvantages of the conventional shock absorber. At present, all cars in developed countries abroad adopt an electronic control suspension (EDC) system to meet the requirements of the shock absorbers of the cars.

An electronically controlled suspension (EDC) system includes an electronic control device, an actuator, and a detection circuit that electronically controls the suspension. An electronic control device: the main functions of the device are that a power supply used in the electric control device and various sensor power supplies are provided by a voltage-stabilized power supply to amplify sensor signals, calculate input signals, drive an actuating mechanism and detect faults. An executing mechanism: the damper comprises an actuator for changing the damping force of the damper, an air spring control valve and an oil-gas spring pressure control valve. The executor that the bumper shock absorber damping force changed changes the damping force of bumper shock absorber through rotating the bumper shock absorber control lever: the air spring control valve is used for controlling the height of a vehicle body, and when the electromagnetic coil is electrified, the core rod pushes the plunger to move under the action of electromagnetic force, so that an air passage is closed, and ON/OFF action is formed; the hydro-pneumatic spring proportional valve is a hydro-pneumatic spring pressure control valve, when the hydro-pneumatic spring proportional valve is electrified, an electromagnetic coil generates electromagnetic force proportional to current to push a valve rod to move, and when the thrust output voltage of the valve rod is equal, the valve rod stops moving to generate oil pressure proportional to the current. Such an electronically controlled suspension (EDC) system is complex in structure and high in production cost.

Based on the background, ZL200410025890.7 discloses an automatically controlled suspension of car, including bumper shock absorber, electronic control device, sensor and actuating mechanism, its technical characterstic is: 1. the hydraulic cylinder is additionally arranged on the mechanical shock absorber of the original vehicle, and the shaking and the swaying of the vehicle body in all directions are controlled through the hydraulic cylinder; 2. the electronic control device mainly comprises a microprocessor: the electronic control device receives the signal sent by the sensor, and sends the signal to the digital electromagnetic valve after being modulated and amplified by the pulse width. The flow of the hydraulic oil is controlled by controlling the opening time of the electromagnetic valve, so that the movement of the hydraulic cylinder is controlled, and the aim of controlling the movement state of the automobile is fulfilled.

The hydraulic cylinder is additionally arranged on the shock absorber of the original vehicle, and the shock absorber is used as a piston rod of the hydraulic cylinder.

The power transmission device in the actuating mechanism consists of a low-pressure pump, a medium-pressure pump, a sleeve and an electromagnetic clutch which are sleeved on the same shaft. When the power supply is switched on, the magnetic field generated by the electromagnetic clutch enables the sucker to be tightly adsorbed with the belt pulley, and the belt pulley drives the sucker and the rotating shaft connected with the sucker to move so as to drive the medium pressure pump to move; on the contrary, when the power supply is cut off and the magnetic field disappears, the rotating shaft is static, and the medium pressure pump sleeved on the rotating shaft also stops moving.

The sensor transmits the detected road condition, speed, starting, accelerating, steering and braking conditions of the running vehicle to the control device, the signals are processed by the microprocessor and transmitted to the digital electromagnetic valve, and the horizontal performance of the suspension is accurately and timely adjusted through the executing mechanism.

Because the electric control suspension of the automobile provided by ZL200410025890.7 adopts the technical measures, the change of the stroke height of the hydraulic cylinder can adapt to more complex road conditions, the adjusting capability of the height of the automobile body is greatly improved, a certain driving level can be kept no matter how the loading of the automobile changes, and the geometric relation of the automobile suspension is ensured to be unchanged. When the automobile turns, starts and accelerates suddenly, the automobile has better driving performance, improves the safety, the comfort and the off-road property of the automobile, and has the characteristics of simple structure and low cost.

However, the electronic control suspension of the automobile is difficult to combine with the existing mechanical damping device of the modern automobile due to the problem that the related structure is huge due to the design of the electronic control suspension of the automobile according to the conventional hydraulic oil way, so that the electronic control suspension of the automobile is difficult to adapt to the refitting of the existing automobile, and the market prospect is poor.

Disclosure of Invention

The invention provides an automobile electric control suspension with a built-in hydraulic oil circuit, which aims to overcome the defects that the periphery of a hydraulic oil cylinder occupies too large space and is difficult to combine with the existing mechanical damping system of a modern automobile because the outer cylinder wall of the hydraulic oil cylinder in the prior art is provided with an oil inlet and an oil outlet.

The invention comprises a spring cylinder seat, an oil cylinder, a spring middle support, a spring, a piston rod, an upper spring seat and an oil cylinder blanking cover; wherein, the upper end of the piston rod is connected with a spring cylinder seat through threads. An upper cylinder cover is sleeved at the lower end of the piston rod, and the inner circumferential surface of the upper cylinder cover is in clearance fit with the circumferential surface of the piston rod. The inner end of the cylinder barrel of the oil cylinder is arranged in the spring barrel seat, and the inner end of the cylinder barrel of the oil cylinder is sleeved on the outer circumferential surface of the upper cover of the oil cylinder; the inner cylinder plug is positioned in the cylinder barrel of the oil cylinder, and an oil cavity chamber at one end of the inner cylinder plug is arranged in an inner hole at the inner end of the piston rod; the outer circumference of the inner cylinder plug is sleeved with a piston. The O-shaped sealing ring seat is positioned in the cylinder barrel of the oil cylinder and is positioned at the end head of the cylinder barrel of the oil cylinder; the center of the O-shaped sealing ring seat is provided with an oil inlet hole which is axially communicated. The oil cylinder block cover is installed at the end of the oil cylinder barrel through threads, and the inner end face of the oil cylinder block cover is attached to the outer end face of the O-shaped sealing ring seat and sealed. The outer surface of the oil cylinder blocking cover is provided with a lower cavity oil hole, and an inner end orifice of the lower cavity oil hole is communicated with an oil inlet hole in the center of the O-shaped sealing ring seat; an upper cavity oil hole is processed on the outer surface of the oil cylinder blocking cover, and the upper cavity oil hole is communicated with an upper cavity oil cylinder wall oil guide hole in the oil cylinder shell.

And a fit clearance of 0.07mm is formed between the inner circumferential surface of the cylinder barrel and the outer circumferential surface of the piston rod, the outer circumferential surface of the cylinder barrel is in clearance fit with the inner circumferential surface of the spring barrel seat, and the fit clearance is 1.0 mm.

The upper end face of the piston rod is fixedly connected with the lower end of the damper. The upper end of the damper is sleeved with an upper spring seat, the outer end face of the upper spring seat is sleeved with an upper spring gland, and the upper spring seat is fixed through the upper spring gland.

The spring is divided into two sections, wherein one section is sleeved on the damper, and the other section is sleeved on the spring cylinder seat; and a spring middle support is arranged between the two series-connected springs, and the two springs are interacted through the spring middle support.

The inner surface of the piston is a stepped surface, the aperture of a minimum inner hole positioned in the middle of the piston is slightly larger than the diameter of the three-level stepped surface of the inner cylinder plug, and the inner cylinder plug is in clearance fit with the piston after being installed in the piston; the inner diameter of the upper end of the piston is the same as the diameter of the secondary stepped surface of the inner cylinder plug, and the inner diameter and the secondary stepped surface are in clearance fit; the lower end of the piston is provided with an installation space for fastening a nut.

The inner diameter of the spring cylinder seat is 1.0mm larger than the outer diameter of the oil cylinder barrel, so that clearance fit is formed between the spring cylinder seat and the oil cylinder barrel; the outer diameter of the spring cylinder seat is smaller than the inner diameter of the spring. An adjusting nut is fixed on the inner end surface of the upper end of the spring cylinder seat, and the adjusting nut is engaged with the thread of the piston rod. A radially protruding flange is provided on the outer circumferential surface of the lower end of the spring cylinder base for positioning the lower end of the spring.

The cylinder barrel of the oil cylinder is in a sleeve shape, the inner diameter of the cylinder barrel is 0.07mm larger than the outer diameter of the piston rod, and clearance fit is formed between the cylinder barrel and the piston rod; the outer surface of the cylinder barrel of the oil cylinder is matched with the inner surface of the spring barrel seat by a clearance of 1.0 mm. The inner surface of the upper end of the cylinder barrel of the oil cylinder is a step surface matched with the outer surface of the upper cover of the oil cylinder. The outer surface of the end head of the lower end of the cylinder barrel of the oil cylinder is provided with a groove which is matched with the inner surface of the O-shaped sealing ring seat to form a mounting surface of the sealing ring; the concave surface of the inner surface of the end head of the lower end of the cylinder barrel of the oil cylinder is matched with the outer surface of the O-shaped sealing ring seat. An axially through upper cavity oil cylinder wall oil guide hole is processed on the oil cylinder shell; the aperture of the upper cavity oil way is 2.5 mm.

The support in the spring is a ring-shaped piece. The longitudinal section of the support in the spring is I-shaped, and the inner diameter of the support in the spring is adapted to the outer diameter of the spring. The center of the support in the spring is provided with a through hole, and the aperture of the through hole is larger than the outer diameter of the spring cylinder seat.

The upper spring seat is a hollow revolving body. The inner diameter of the upper spring seat is larger than the outer diameter of the damper. A stopper projecting in a radial direction is provided on an outer circumferential surface of the upper spring seat for positioning the spring.

The oil cylinder blocking cover is T-shaped. The upper end of the oil cylinder block cover is provided with an internal thread connecting sleeve matched with the oil cylinder barrel, and the lower end of the oil cylinder block cover is provided with an installation section of the hanging ring. An upper cavity oil hole and a lower cavity oil hole are processed on the outer circumferential surface of the middle section of the oil cylinder blocking cover. The inner surface of the connecting sleeve in the oil cylinder plug cover is provided with a sealing groove.

The outer circumferential surface of the inner cylinder plug is a four-stage stepped surface, an annular sleeve with a radially protruding shaft is arranged at the outer edge of the end face at the upper end of the inner cylinder plug, the outer circumferential surface of the sleeve is formed into a one-stage stepped surface, the outer diameter of the one-stage stepped surface is the same as the inner diameter of the piston rod, and the sleeve and the piston rod are in clearance fit after being installed in the piston rod. The middle section of the inner cylinder plug is a secondary stepped surface, the diameter of the secondary stepped surface is the same as the inner diameter of the upper end of the piston, and the secondary stepped surface and the piston are in clearance fit. The lower end of the secondary stepped surface is a tertiary stepped surface which is in clearance fit with the minimum inner hole section of the piston.

In order to solve the problem that the existing automobile electric control suspension is difficult to combine with the existing mechanical damping system of the modern automobile and overcome the defects of complex structure and high cost of a car electric control suspension (EDC) system, the invention improves the oil way of a pressing device in the prior art.

The invention is technically characterized in that:

1. an axial up-and-down through hole is arranged at the center of the inner and outer cylinder walls of the hydraulic cylinder barrel of the hydraulic device with the patent number of 200410025890.7 and is used as a guide inlet and an outlet of a hydraulic oil path.

2. The outer wall of the oil cylinder is perforated to the inner side of the other end of the hydraulic cylinder barrel in the direction perpendicular to the cross section of the oil cylinder, the hole is in butt joint with an oil way inlet hole in a blocking cover of the hydraulic cylinder barrel, hydraulic oil in the medium pressure pump is sent to an oil inlet on one side of the bottom end of the piston, the hydraulic oil flows into an upper cavity of the hydraulic cylinder through an upper through hole and a lower through hole in the axial direction of the hydraulic cylinder barrel, and otherwise, the hydraulic oil in the upper cavity of the hydraulic cylinder flows back to the oil tank.

3. Go up hydraulic pressure cylinder cap lower extreme and open and to have 4 hydraulic circuit export groove to couple together hydraulic oil and the axial upper and lower through-hole in the inside and outside cylinder wall center of hydro-cylinder, the outer wall punches and has guaranteed hydraulic cylinder outer wall and spring cylinder base hole matched with smoothness when guaranteeing piston upper and lower pressure differential, the upper and lower mobility of spring cylinder base as the spring damper guide rail has been guaranteed, make the spring cylinder base more smooth and easy with the cooperation of hydraulic cylinder external diameter when adjusting spring pressure soft or hard degree, thereby guaranteed and original factory's bumper shock absorber design size's uniformity, the interchangeability of bumper shock absorber on various vehicles has been improved.

4. And a hole is formed in the center of the sealing ring seat, is butted with an oil way inlet hole in the blocking cover of the outer cylinder barrel and is a passage for hydraulic oil to flow into the lower cavity of the hydraulic cylinder, and otherwise, the hydraulic oil in the lower cavity of the hydraulic cylinder flows back to the oil tank through the central hole of the sealing ring seat. Two O-shaped sealing ring sealing grooves are formed in the lower portion of the end face of the sealing ring seat, and are mainly used for isolating and sealing hydraulic oil in an upper cavity and a lower cavity of the outer cylinder barrel blocking cover to be in butt joint with two hydraulic oil inlet and outlet holes in the outer cylinder barrel blocking cover, so that two hydraulic oil paths cannot be communicated. The above 4 points are the innovation points of the present invention.

In the hydraulic cylinder disclosed in the invention patent 200410025890.7, the oil inlet and the oil outlet are located on the outer wall of the cylinder barrel and are respectively connected with the medium-pressure pump and the low-pressure pump, and although the design ensures that the pressures on the two sides of the piston are different, the outer wall of the cylinder barrel of the cylinder is not in a complete cylindrical shape due to the additional arrangement of the pump interface. So the pump interface that hydraulic cylinder installed additional has hindered current automobile damping system spring device's motion stroke, leads to the difficult vehicle that can apply to of this patent, and the practicality is relatively poor. The present invention improves upon this problem. And the hydraulic oil circuit and related parts are redesigned.

The strength of the key component hydraulic cylinder is checked through CAE structure simulation. The material of the oil cylinder barrel is No. 45 steel, the yield strength is 355MPa, the simulation result shows that the maximum stress is positioned at the oil cylinder wall oil guide hole 10 and the oil cylinder barrel oil guide hole, and the maximum pressure value is 199MPa and is less than 355 MPa. And from the result of experimental verification, the design requirements are completely met. The crude oil inlet and the crude oil outlet are moved upwards, so that a movement space is provided for a spring of the automobile mechanical shock absorber, and the electric control hydraulic shock absorber is installed under the condition that the original automobile mechanical shock absorption system component is not changed.

During verification experiments, the aperture of the oil guide hole on the wall of the oil cylinder is 1.6mm, 1.8mm, 2.0mm, 2.3mm, 2.4mm and 2.5mm respectively, and the maximum stress of the oil cylinder corresponding to each aperture is 256.53MPa, 259.95MPa, 253.85MPa, 260.13MPa, 255.59MPa and 239.31MPa respectively through finite element simulation. Experiments prove that when the aperture is 2.5mm, the maximum stress of the cylinder barrel of the oil cylinder is the minimum.

Due to the adoption of the technical scheme, the hydraulic device is more compact as a whole, the structure is simple, the part processing difficulty is reduced, and the automobile electric control suspension can be more widely applied to various types of automobiles.

The invention is suitable for the vehicles of the police force, armed police force and field army force, in order to meet the requirement of modern battlefield, the vehicle is required to have extremely high flexible maneuverability and concealment, the invention overcomes the technical deficiency in the existing vehicle, when needing concealment, the height of the vehicle body can be reduced, the chassis of the vehicle body is tightly attached to the ground, so as to effectively protect the vehicle. The vehicle body can be improved when the army needs to be struck, so that the mechanical maneuverability and the fighting capacity of the army are greatly improved. The common vehicle can generate up-down, front-back, left-right jolting in the battlefield movement process, so that a fighter can not aim at the enemy to shoot in the vehicle driving process, and the vehicle of the invention can overcome the swinging and shaking in the vehicle driving process, so that the fighter can accurately aim at and eliminate the enemy in the vehicle movement. The missile vehicle used in the rocket troops travels in the field, such as on a flat ground, so that the safety of the vehicle, the trafficability characteristic and the time for shortening the trafficability characteristic of the road are improved. The battlefield ambulance can run stably, and the pain of the sick and wounded in the transfer process is reduced. The automobile has wider market prospect in the civil aspect, the automobiles with the discharge capacity of more than 1.6 liters can be installed, and a driver can control and adjust the height of the automobile body at any time according to road conditions, so that the off-road performance of the automobile is improved. The safety protection device is arranged on an energy-saving and emission-reducing electric automobile and an automatic control driving vehicle, can improve the safety of drivers and passengers and the safety of batteries, and can avoid unnecessary loss caused by water inlet short circuit of the batteries.

Compared with the prior art, the invention has the following beneficial effects:

1. the safety is improved:

when the automobile turns, the spring of the damper and the damper are compressed under the action of centrifugal force along with the increase of centrifugal force, the invention ensures that the automobile body has small side inclination and the change of camber angle of the wheel is small, the tire can be well kept in vertical contact with the ground, and the driving and braking capabilities of the tire are fully exerted. The front of the vehicle body is slightly bent during braking, the backward bending during starting and rapid acceleration is also reduced, even in poor road conditions, the bounce of the vehicle is also small, when the vehicle using the traditional shock absorber is fully seated by a member or fully loaded with goods, the phenomena of light left, heavy right, light left or head up of the vehicle can occur, and the optical axis of the headlamp is upward, so that a driver of the vehicle driving from head to head can feel dazzling. The automobile adopting the invention can always keep a certain driving level and a parking level no matter how the loading of the automobile changes, so that the door is not damaged by the fact that the door is opened by inclining to the side on the road surface and the barrier is touched, and the geometric relation of the automobile suspension is ensured to be unchanged.

2. The comfort is improved:

the invention makes the automobile advance to the humanization direction. The device can reduce the jolt of the automobile up, down, left and right on a complex road according to the will of people, reduce the carsickness of drivers and passengers, ensure that the automobile can always run in a horizontal state like a train, and ensure the safety and comfort of the drivers and passengers. The driver can drive the automobile to go out, the tire on the road is damaged inevitably, the driver does not need to climb to the bottom of the automobile to drive the jack when replacing the tire, the four wheels of the automobile can be independently lifted through the invention, and the problem of replacing the tire by the jack is solved.

3. The off-road property is improved:

the chassis of the common car is about 180mm away from the ground, but the invention can lead the height of the car body of the chassis of the car to be randomly adjusted within the range of 180mm-380mm, thus greatly improving the safety performance and the cross-country performance of the car, and the hydraulic cylinder can be increased according to the design of the car type. The invention is characterized in that the hydraulic pump is provided with an electromagnetic clutch, so that the hydraulic pump can be started to work when needed, the electromagnetic clutch is separated to stop working when not used, and at the moment, the automobile electric control suspension with the built-in hydraulic oil circuit does not consume kinetic energy and is divided into automatic control and manual control in control. The hydraulic pump is always in working state during automatic control, and the height of the vehicle body can be controlled only in a moment during manual control, so that the vehicle provided with the hydraulic pump can save half energy per hundred kilometers compared with an off-road vehicle, and the trafficability is improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the structure of the portion A in FIG. 1;

FIG. 3 is a schematic structural view of the upper spring seat gland; wherein fig. 3a is a front view and fig. 3b is a side view;

FIG. 4 is a schematic structural view of an upper spring seat;

FIG. 5 is a schematic view of the structure of the seat in the spring;

FIG. 6 is a schematic view of the construction of the spring cartridge holder;

FIG. 7 is a schematic structural diagram of an upper cover of the oil cylinder;

FIG. 8 is a schematic structural view of a cylinder barrel;

FIG. 9 is a schematic view of the inner cylinder plug;

FIG. 10 is a schematic structural view of an O-ring seat;

FIG. 11 is a schematic structural diagram of a cylinder block cover;

FIG. 12 is a schematic view of the piston construction;

fig. 13 is a schematic diagram of maximum stress of a bore cylinder when oil is guided by the cylinder wall with different bore diameters, wherein: fig. 13a shows the maximum stress of the cylinder for a bore diameter of 1.6mm, fig. 13b shows the maximum stress of the cylinder for a bore diameter of 186mm, fig. 13c shows the maximum stress of the cylinder for a bore diameter of 2.0mm, fig. 13d shows the maximum stress of the cylinder for a bore diameter of 2.3mm, fig. 13e shows the maximum stress of the cylinder for a bore diameter of 2.4mm, and fig. 13f shows the maximum stress of the cylinder for a bore diameter of 2.5 mm.

In the figure: 1. a clamp spring; 2. a spring gland is arranged; 3. an upper spring seat; 4. a damper; 5. a spring; 6. a piston rod; 7. a spring middle support; 8. a spring barrel seat; 9. an oil cylinder upper cover; 10. oil guide hole on cylinder wall; 11. an oil cylinder barrel; 12. tightening the nut; an O-shaped seal ring seat; 14. blocking the oil cylinder; 15. a lower cavity oil hole; 16. a hoisting ring; 17. an inner cylinder plug; 18. a piston; 19. a combination pad sealing ring; 20. an upper cavity oil hole; 21. and adjusting the nut.

Detailed Description

The embodiment is an automobile electric control suspension with a built-in hydraulic oil circuit, which comprises a spring cylinder 8 seat, an oil cylinder 11, a spring middle support 7, a spring 5, a piston rod 6, an upper spring seat 3 and an oil cylinder blanking cover 14; the piston rod is positioned in the spring cylinder seat, and the upper end of the piston rod is connected with the spring cylinder seat 8 through threads; an adjusting nut 21 is provided on the inner end face of the spring cylinder 8, by means of which the length of the spring is adjusted. An upper cylinder cover 9 is fitted over the lower end of the piston rod, and the inner circumferential surface of the upper cylinder cover is in clearance fit with the circumferential surface of the piston rod. The inner end of the cylinder barrel 11 of the oil cylinder is arranged in the spring barrel seat 8, and the inner end of the cylinder barrel of the oil cylinder is sleeved on the outer circumferential surface of the upper cover of the oil cylinder; and a fit clearance of 0.07mm is formed between the inner circumferential surface of the cylinder barrel 11 and the outer circumferential surface of the piston rod 6, the outer circumferential surface of the cylinder barrel 11 is in clearance fit with the inner circumferential surface of the spring barrel seat 8, and the fit clearance is 1.0 mm. The inner cylinder plug 17 is positioned in the cylinder barrel of the oil cylinder, and an oil cavity chamber at one end of the inner cylinder plug is arranged in an inner hole at the inner end of the piston rod; a piston 18 is sleeved on the outer circumference of the inner cylinder plug and is in sealing fit with the middle section of the inner cylinder plug; a fastening nut 12 is mounted on the piston fixing section of the inner cylinder plug, and the piston is fixed by the fastening nut 12. A packing ring 19 is installed in a seal groove of an outer circumferential surface of the piston 18. The O-shaped sealing ring seat 13 is positioned in the oil cylinder barrel 11 and at the end of the oil cylinder barrel; the inner end face of the O-shaped sealing ring seat is attached to the outer end face of the piston, a sealing groove for placing an O-shaped sealing ring is formed in the outer circumferential surface of the O-shaped sealing ring seat, and the O-shaped sealing ring seat is in sealing fit with the inner circumferential surface of the cylinder barrel of the oil cylinder. The center of the O-shaped sealing ring seat is provided with an oil inlet hole which is axially communicated. Two annular sealing grooves are arranged on the outer end face of the O-shaped sealing ring seat. The oil cylinder block cover 14 is installed at the end of the oil cylinder barrel 11 through threads, and the inner end face of the oil cylinder block cover 14 is attached to and sealed with the outer end face of the O-shaped sealing ring seat 13. An O-shaped sealing ring is arranged between the inner surface of the oil cylinder blocking cover 14 and the outer surface of the oil cylinder barrel 11. A lower cavity oil hole 15 is processed on the outer surface of the oil cylinder blocking cover, and an inner end orifice of the lower cavity oil hole is communicated with an oil inlet hole in the center of the O-shaped sealing ring seat 13; an upper cavity oil hole 20 is formed on the outer surface of the cylinder block cover 14, and the upper cavity oil hole is communicated with an upper cavity cylinder wall oil guide hole 10 in the housing of the cylinder barrel 11. A lifting ring 16 is arranged at the end of the oil cylinder plug cover 14 through a universal bearing.

The upper end face of the piston rod 6 is fixedly connected with the lower end of the damper 4, and the damper 4 adopts the prior art. An upper spring seat 3 is fitted over the upper end of the damper 4, an upper spring cover 2 is fitted over the outer end surface of the upper spring seat, and the upper spring seat 3 is fixed by the upper spring cover 2. And a lifting ring is arranged at the end head of the upper end of the damper through a universal bearing.

The spring 5 is divided into two sections, wherein one section is sleeved on the damper 4, and the other section is sleeved on the spring cylinder seat 8; and a spring middle support 7 is arranged between the two series springs, and the two springs are interacted through the spring middle support.

The spring cylinder seat 8 is in a sleeve shape, the inner diameter of the spring cylinder seat is 1.0mm larger than the outer diameter of the oil cylinder barrel 11, and clearance fit is formed between the spring cylinder seat and the oil cylinder barrel; the outer diameter of the spring cylinder 8 is smaller than the inner diameter of the spring 5. An adjusting nut 21 is fixed to an inner end surface of an upper end of the spring cylinder holder 8, and is engaged with the thread of the piston rod. A radially protruding flange is provided on the outer circumferential surface of the lower end of the spring cylinder 8 for positioning the lower end of the spring 5.

The cylinder barrel 11 of the oil cylinder is in a sleeve shape, the inner diameter of the cylinder barrel is 0.07mm larger than the outer diameter of the piston rod, and clearance fit is formed between the cylinder barrel and the piston rod; the outer surface of the cylinder barrel 11 is in clearance fit with the inner surface of the spring barrel seat 8 by 1.0 mm. The inner surface of the upper end of the oil cylinder 11 is a step surface matched with the outer surface of the oil cylinder upper cover 9. A groove is formed in the outer surface of the end head of the lower end of the oil cylinder barrel 11 and is matched with the inner surface of the O-shaped sealing ring seat to form a sealing ring mounting surface; the concave surface of the inner surface of the end head of the lower end of the oil cylinder barrel 11 is matched with the outer surface of the O-shaped sealing ring seat. An axially through upper cavity oil cylinder wall oil guide hole 10 is processed on the shell of the oil cylinder barrel 11; the aperture of the upper cavity oil way is 2.5 mm.

TABLE 1 materials and Properties of cylinders

Material	Density/(kg/m)³)	Poisson ratio	Modulus of elasticity/GPa	Yield strength/MPa
					45 steel	7850	0.3	210	355

The support 7 in the spring is a ring-shaped element. The longitudinal section of the support in the spring is I-shaped, and the inner diameter of the support in the spring is adapted to the outer diameter of the spring 5. The center of the support 7 in the spring is provided with a through hole, and the aperture of the through hole is larger than the outer diameter of the spring cylinder seat 8.

The upper spring seat 3 is a hollow rotary body. The inner diameter of the upper spring seat is larger than the outer diameter of the damper 4. A radially projecting stop is provided on the outer circumferential surface of the upper spring plate 3 for positioning the spring 5.

The oil cylinder blocking cover 14 is T-shaped. The upper end of the oil cylinder block cover is an internal thread connecting sleeve matched with the oil cylinder barrel 11, and the lower end of the oil cylinder block cover 14 is an installation section of the hanging ring 16. An upper cavity oil hole 20 and a lower cavity oil hole 15 are processed on the outer circumferential surface of the middle section of the cylinder block cover 14. The cylinder cap 14 has a seal groove formed on the inner surface of the connecting sleeve.

The piston rod 6 is a thin-wall cylinder, the inner diameter of the piston rod is slightly larger than the outer diameter of the damper 4, and the damper and the piston rod are in clearance fit after being installed in the piston rod. A piston 18 is screwed to the lower end of the piston rod 6.

The outer circumferential surface of the inner cylinder plug 17 is a four-step stepped surface, an annular sleeve with a radially protruding shaft is arranged at the outer edge of the end face at the upper end of the inner cylinder plug, the outer circumferential surface of the sleeve is formed into a one-step stepped surface, the outer diameter of the one-step stepped surface is the same as the inner diameter of the piston rod, and the sleeve and the piston rod are in clearance fit after being installed in the piston rod. The middle section of the inner cylinder plug is a secondary stepped surface, the diameter of the secondary stepped surface is the same as the inner diameter of the upper end of the piston, and the secondary stepped surface and the piston are in clearance fit. The lower end of the secondary stepped surface is a tertiary stepped surface which is in clearance fit with the minimum inner hole section of the piston. The lower end of the inner cylinder plug is provided with a screw rod with the smallest diameter, and a fastening nut 12 is arranged on the screw rod.

The piston 18 is a hollow rotary body. The inner surface of the piston is a stepped surface, the aperture of the minimum inner hole in the middle of the piston is slightly larger than the diameter of the three-level stepped surface of the inner cylinder plug 17, and after the inner cylinder plug 17 is arranged in the piston 18, the inner cylinder plug and the piston are in clearance fit. The inner diameter of the upper end of the piston is the same as the diameter of the secondary stepped surface of the inner cylinder plug, and the inner diameter and the secondary stepped surface are in clearance fit. The lower end of the piston is provided with an installation space for fastening a nut.

When in use, the utility model is used for cleaning the inner wall of the tank,

a hydraulic pump is connected to the lower cavity oil hole 15 of the cylinder block cover 14 in fig. 1, and hydraulic oil is pressurized by the power hydraulic pump to move the piston in the hydraulic cylinder upward through the lower cavity oil hole 15. The cavity oil hole 20 on the cylinder barrel blocking cover 14 is connected with a hydraulic pump. On one hand, hydraulic pump oil leads hydraulic oil into the oil cylinder wall oil guide hole 10 of the oil cylinder barrel through the upper cavity oil hole 20, the hydraulic oil passing through the oil cylinder wall oil guide hole 10 enters the oil cylinder upper cavity of the piston 18, the oil cylinder upper cavity of the piston 18 bears the hydraulic oil from the hydraulic pump, so that the piston 18 moves downwards, the electromagnetic valve of the lower cavity oil hole 15 is opened, and an oil path is connected to enable the hydraulic oil of the lower cavity oil hole 15 to smoothly return to the oil tank; and vice versa for upper chamber oil port 20. On the other hand, hydraulic oil of the hydraulic pump is led into the cylinder barrel through the cylinder plug 14 and the lower cavity oil hole 15, due to the limitation of the O-shaped sealing ring seat 13, the oil can only be led into the cylinder barrel 11 from the lower cavity oil hole 15 through the center hole of the O-shaped sealing ring seat 13, a gap of the sealing ring seat in the center of the cross section of the bottom surface of the cylinder barrel 11 enters the hydraulic cylinder, and the lower cavity of the cylinder of the piston 18 is subjected to oil pressure from the hydraulic pump. The lower pressure born by the upper cylinder cavity of the piston and the high pressure born by the lower cylinder cavity of the piston enable a higher pressure difference to exist between the upper end and the lower end of the piston, and the up-and-down movement of the piston is controlled by adjusting the opening or closing of the electromagnetic valve of the hydraulic pump, so that the purpose of controlling the lifting of the piston is finally achieved.

The key point of the invention is the cooperation of the sleeve blanking cover, the cylinder barrel of the oil cylinder and the sealing ring seat, the oil inlet and the oil outlet are concentrated on the oil cylinder blanking cover, and simultaneously, the high-pressure oil and the low-pressure oil are respectively arranged on two sides of the piston in the hydraulic cylinder, so that the two sides of the piston have stable and reliable pressure difference. The inner cylinder plug 17 is positioned in the cylinder barrel of the oil cylinder, and an oil cavity chamber at one end of the inner cylinder plug is arranged in an inner hole at the inner end of the piston rod; a piston 18 is sleeved on the outer circumference of the inner cylinder plug and is in sealing fit with the middle section of the inner cylinder plug; a fastening nut 12 is mounted on the piston fixing section of the inner cylinder plug, and the piston is fixed by the fastening nut 12. A packing ring 19 is installed in a seal groove of an outer circumferential surface of the piston 18.

Claims

1. An automobile electric control suspension with a built-in hydraulic oil way is characterized by comprising a spring cylinder seat (8), an oil cylinder barrel (11), a spring middle support (7), a spring (5), a piston rod (6), an O-shaped sealing ring seat (13) and an oil cylinder plug cover (14); wherein the upper end of the piston rod is connected with a spring cylinder seat (8) through threads; an adjusting nut (21) is arranged on the inner end surface of the spring cylinder seat; an oil cylinder upper cover (9) is sleeved at the lower end of the piston rod, and the inner circumferential surface of the oil cylinder upper cover is in clearance fit with the circumferential surface of the piston rod; one end of the cylinder barrel of the oil cylinder is arranged in the spring barrel seat, and the inner end of the cylinder barrel of the oil cylinder is sleeved on the outer circumferential surface of the upper cover of the oil cylinder; the inner cylinder plug (17) is positioned in the cylinder barrel of the oil cylinder, and an oil cavity chamber at one end of the inner cylinder plug is arranged in an inner hole at the inner end of the piston rod; a piston (18) is sleeved on the outer circumference of the inner cylinder plug; the O-shaped sealing ring seat (13) is positioned in the oil cylinder barrel (11) and at the end of the oil cylinder barrel; an oil inlet hole which is axially communicated is formed in the center of the O-shaped sealing ring seat; the oil cylinder blocking cover (14) is installed at the end of the oil cylinder barrel (11) through threads, and the inner end face of the oil cylinder blocking cover is attached to and sealed with the outer end face of the O-shaped sealing ring seat; a lower cavity oil hole (15) is processed on the outer surface of the oil cylinder blocking cover, and an inner end orifice of the lower cavity oil hole is communicated with an oil inlet hole in the center of the O-shaped sealing ring seat (13); an upper cavity oil hole (20) is processed on the outer surface of the oil cylinder blocking cover (14), and the upper cavity oil hole is communicated with an upper cavity oil cylinder wall oil guide hole (10) in a shell of the oil cylinder barrel (11); the spring (5) is divided into two sections, wherein one section is sleeved on the damper (4), and the other section is sleeved on the spring cylinder seat (8); and a spring middle support (7) is arranged between the two series springs, and the two springs are interacted through the spring middle support.

2. The electrically controlled suspension for an automobile incorporating a hydraulic circuit as set forth in claim 1, wherein a fitting clearance of 0.07mm is provided between the inner circumferential surface of said cylinder tube (11) and the outer circumferential surface of said piston rod 6, and a fitting clearance of 1.0mm is provided between the outer circumferential surface of said cylinder tube and the inner circumferential surface of said spring cylinder holder (8).

3. The automotive electric control suspension with the built-in hydraulic oil circuit as claimed in claim 1, wherein the upper end surface of the piston rod (6) is fixedly connected with the lower end of the damper (4); an upper spring seat (3) is sleeved at the upper end of the damper, an upper spring gland (2) is sleeved at the outer end face of the upper spring seat, and the upper spring seat is fixed through the upper spring gland.

4. The automotive electrically-controlled suspension with the built-in hydraulic oil circuit as claimed in claim 1, wherein the inner surface of the piston (18) is a stepped surface, the diameter of the smallest inner hole in the middle of the piston is slightly larger than the diameter of the three-step surface of the inner cylinder plug, and the inner cylinder plug is in clearance fit with the piston after being installed in the piston; the inner diameter of the upper end of the piston is the same as the diameter of the secondary stepped surface of the inner cylinder plug, and the inner diameter and the secondary stepped surface are in clearance fit; the lower end of the piston is provided with an installation space for fastening a nut.

5. The automotive electric control suspension with the built-in hydraulic oil circuit as claimed in claim 1, wherein the inner diameter of the spring cylinder seat (8) is 1.0mm larger than the outer diameter of the oil cylinder barrel (11) so as to form clearance fit between the spring cylinder seat and the oil cylinder barrel; the outer diameter of the spring cylinder seat is smaller than the inner diameter of the spring (5); an adjusting nut (21) is fixed on the inner end surface of the upper end of the spring cylinder seat, and the adjusting nut is meshed with the thread of the piston rod; a radially protruding flange is provided on an outer circumferential surface of a lower end of the spring cylinder base for positioning the lower end of the spring.

6. The automotive electric control suspension with the built-in hydraulic oil circuit as claimed in claim 1, wherein the inner diameter of the cylinder barrel (11) is 0.07mm larger than the outer diameter of the piston rod, so that clearance fit is formed between the two; the outer surface of the cylinder barrel of the oil cylinder is matched with the inner surface of the spring barrel seat (8) by a clearance of 1.0 mm; the inner surface of the upper end of the cylinder barrel of the oil cylinder is a step surface matched with the outer surface of the upper cover (9) of the oil cylinder; the outer surface of the end head of the lower end of the cylinder barrel of the oil cylinder is provided with a groove which is matched with the inner surface of the O-shaped sealing ring seat to form a mounting surface of the sealing ring; the concave surface of the inner surface of the end head at the lower end of the oil cylinder barrel (11) is matched with the outer surface of the O-shaped sealing ring seat; an upper cavity oil cylinder wall oil guide hole (10) which is axially communicated is processed on the oil cylinder shell; the aperture of the upper cavity oil way is 2.5 mm.

7. The automotive electrically controlled suspension with built-in hydraulic circuit according to claim 1, characterized in that the spring center support (7) is an annular member; the longitudinal section of the spring middle support is I-shaped, and the inner diameter of the spring middle support is adapted to the outer diameter of the spring (5); the center of the support in the spring is provided with a through hole, and the aperture of the through hole is larger than the outer diameter of the spring cylinder seat (8).

8. The electrically controlled suspension for an automobile incorporating a hydraulic circuit as set forth in claim 1, wherein said upper spring seat has an inner diameter larger than an outer diameter of said damper (4); a radially protruding stop is arranged on the outer circumferential surface of the upper spring seat (3) for positioning the spring (5).

9. The automotive electrically controlled suspension with built-in hydraulic circuit according to claim 1, characterized in that the cylinder block cover (14) is T-shaped in shape; the upper end of the oil cylinder block cover is provided with an internal thread connecting sleeve matched with the oil cylinder barrel (11), and the lower end of the oil cylinder block cover is provided with an installation section of the hanging ring (16); an upper cavity oil hole (20) and a lower cavity oil hole (15) are processed on the outer circumferential surface of the middle section of the oil cylinder blocking cover; the inner surface of the connecting sleeve in the oil cylinder plug cover is provided with a sealing groove.

10. The electrically controlled suspension of an automobile with a built-in hydraulic circuit as claimed in claim 1, wherein the outer circumferential surface of the inner cylinder stopper (17) is a four-step stepped surface, and an annular sleeve with a radially protruding shaft is formed at the outer edge of the end surface of the upper end of the inner cylinder stopper, so that the outer circumferential surface of the sleeve is formed into a one-step stepped surface, the outer diameter of the one-step stepped surface is the same as the inner diameter of the piston rod, and the sleeve is in clearance fit with the piston rod when the sleeve is installed in the piston rod; the middle section of the inner cylinder plug is a secondary stepped surface, the diameter of the secondary stepped surface is the same as the inner diameter of the upper end of the piston, and the secondary stepped surface and the inner diameter of the upper end of the piston are in clearance fit; the lower end of the secondary stepped surface is a tertiary stepped surface which is in clearance fit with the minimum inner hole section of the piston; the lower end of the inner cylinder plug is provided with a screw rod with the smallest diameter, and a fastening nut (12) is arranged on the screw rod.