CN114370475A - Built-in air chamber balance hydro-pneumatic suspension - Google Patents

Abstract

The invention discloses a built-in air chamber balance hydro-pneumatic suspension, which comprises: two hydro-pneumatic springs and a balance pipeline; the two hydro-pneumatic springs are respectively a front hydro-pneumatic spring and a rear hydro-pneumatic spring; the hydro-pneumatic spring is of a hollow structure, the inner cavity of the hydro-pneumatic spring is a main oil cavity, piston rods are arranged in the inner cavity of the hydro-pneumatic spring, the piston rods are of a hollow structure, and floating pistons are arranged in the piston rods, so that an inner air chamber is formed in the inner cavity of each piston rod; the main oil cavity of the front hydro-pneumatic spring is connected with one end of the balance pipeline, and the main oil cavity of the rear hydro-pneumatic spring is connected with the other end of the balance pipeline; the main oil cavity of the front hydro-pneumatic spring is communicated with the main oil cavity of the rear hydro-pneumatic spring through a balance pipeline; according to the invention, the high-pressure air chamber is highly integrated in the inner cavity of the piston rod of the hydro-pneumatic spring, the original piston type energy accumulator structure is cancelled, the workload of assembly and adjustment is greatly simplified, the product is more integrated and modularized, the disassembly and the maintenance are convenient, and the condition that the arrangement space of a vehicle body is limited can be effectively avoided.

Description

Built-in air chamber balance hydro-pneumatic suspension

Technical Field

The invention belongs to the technical field of hydraulic machinery, and particularly relates to a balance hydro-pneumatic suspension with a built-in air chamber.

Background

In the field of mining machinery, particularly 6X4 vehicle chassis, a middle axle and a rear axle are usually close to each other and need to bear the effect of loading load together, in order to prevent structural parts from being damaged due to overlarge impact on a single axle in the running process of a vehicle, the middle and rear axles are usually designed into a balanced suspension structure, a traditional steel plate spring suspension can realize the balanced suspension function by connecting a middle hinged point with a vehicle frame, after an oil-gas suspension scheme is adopted, the oil cavities of the middle and rear axles on the same side can be conveniently communicated through a pipeline, the pressure of oil cylinders of the middle and rear axles after communication is similar through real vehicle testing, and the oil cylinders of the middle and rear axles only fluctuate slightly near the balanced pressure in the working process, so that the situation of overlarge transient impact pressure cannot occur, and the reliability of the chassis is effectively improved.

The patent 202020210112.0 energy storage ware is erected and is put balanced hydro-pneumatic suspension, has adopted external high low pressure piston energy storage ware between well rear axle hydro-pneumatic spring in the 202020210113.5 energy storage ware horizontal balanced hydro-pneumatic suspension to realize balanced suspension function through the scheme that the pipeline is connected in proper order, the scheme that adopts external high low pressure piston energy storage ware needs more automobile body arrangement space, has also increased manufacturing cost simultaneously.

Disclosure of Invention

In view of the above, the invention provides a balanced hydro-pneumatic suspension with a built-in air chamber, which highly integrates a high-pressure air chamber into an inner cavity of a piston rod of a hydro-pneumatic spring, cancels the original piston type energy accumulator structure, greatly simplifies the workload of assembly and adjustment, enables products to be more integrated and modularized, is convenient to disassemble, assemble and maintain, and can effectively avoid the condition that the layout space of a vehicle body is limited.

The invention is realized by the following technical scheme:

a built-in plenum balanced hydro-pneumatic suspension, comprising: two hydro-pneumatic springs and a balance pipeline;

the two hydro-pneumatic springs are respectively a front hydro-pneumatic spring and a rear hydro-pneumatic spring; the hydro-pneumatic spring is of a hollow structure, the inner cavity of the hydro-pneumatic spring is a main oil cavity, piston rods are arranged in the inner cavity of the hydro-pneumatic spring, the piston rods are of a hollow structure, and floating pistons are arranged in the piston rods, so that an inner air chamber is formed in the inner cavity of each piston rod;

the main oil cavity of the front hydro-pneumatic spring is connected with one end of the balance pipeline, and the main oil cavity of the rear hydro-pneumatic spring is connected with the other end of the balance pipeline; so that the main oil cavity of the front hydro-pneumatic spring is communicated with the main oil cavity of the rear hydro-pneumatic spring through a balance pipeline.

Further, air chambers in the front hydro-pneumatic spring and the rear hydro-pneumatic spring are respectively filled with air volumes with different pressures to form a high-pressure air chamber and a low-pressure air chamber, wherein parameters of the high-pressure air chamber correspond to hydro-pneumatic suspension working pressure when the vehicle is fully loaded, and parameters of the low-pressure air chamber correspond to hydro-pneumatic suspension working pressure when the vehicle is unloaded.

Further, the hydro-pneumatic spring comprises: the device comprises a cylinder barrel, a piston rod, a guide sleeve, a floating piston, a main piston, an upper hinge and a lower hinge;

the cylinder barrel and the piston rod are both cylindrical structures with openings at two ends;

the floating piston and the main piston are both of cylindrical structures with one open end and one closed end; the closed end of the main piston is provided with a central through hole; a circle of axial through holes A which are uniformly distributed along the circumferential direction of the main piston is processed on the side wall of the main piston, and the axial through holes A are throttling holes;

the connection relation of the hydro-pneumatic spring is as follows: the upper hinge is fixed at the upper end of the cylinder barrel and seals an opening at the upper end; the piston rod is coaxially arranged in the cylinder barrel, and an annular gap is reserved between the piston rod and the cylinder barrel; the upper end of the piston rod is positioned in the cylinder barrel, and the lower end of the piston rod extends out of the lower end of the cylinder barrel; the lower hinge is fixed at the lower end of the piston rod and seals the opening at the lower end;

the guide sleeve is arranged in the annular gap and seals one end of the annular gap;

the position of the central through hole of the main piston is fixed at the upper end of the piston rod, and the opening at the upper end is sealed; the open end of the main piston is positioned at the other end of the annular gap; the main oil cavity is formed among the end of the main piston where the central through hole is located, the inner circumferential surface of the cylinder barrel and the upper hinge; annular gaps among the outer circumferential surface of the piston rod, the inner circumferential surface of the cylinder barrel, the end surface of the guide sleeve and the opening end of the main piston form an annular cavity; the main oil cavity is communicated with the annular cavity through a throttling hole in the main piston;

the floating piston is coaxially arranged in the upper end of the piston rod, and the outer circumferential surface of the floating piston is tightly attached to the inner circumferential surface of the piston rod; the lower hinge, the inner circumferential surface of the piston rod and the closed end of the floating piston form the air chamber.

Further, the hydro-pneumatic spring comprises: the device comprises a cylinder barrel, a piston rod, a guide sleeve, a floating piston, a piston with a seal, an upper hinge and a lower hinge;

the cylinder barrel and the piston rod are both cylindrical structures with openings at two ends;

the floating piston and the piston with the seal are both cylindrical structures with one end open and one end closed; more than two axial through holes B are processed on the closed end with the sealing piston, and the axial through holes B are throttling holes;

the connection relation of the hydro-pneumatic spring is as follows: the upper hinge is fixed at the upper end of the cylinder barrel and seals an opening at the upper end; the piston rod is coaxially arranged in the cylinder barrel, and an annular gap is reserved between the piston rod and the cylinder barrel; the upper end of the piston rod is positioned in the cylinder barrel, and the lower end of the piston rod extends out of the lower end of the cylinder barrel; the lower hinge is fixed at the lower end of the piston rod and seals the opening at the lower end;

the guide sleeve is arranged in the annular gap and seals one end of the annular gap;

the closed end with the sealing piston is fixed at the upper end of the piston rod, and the opening at the upper end is closed; the open end of the sealing piston is positioned at the other end of the annular gap; the main oil cavity is formed among the closed end with the sealing piston, the inner circumferential surface of the cylinder barrel and the upper hinge; annular gaps among the outer circumferential surface of the piston rod, the inner circumferential surface of the cylinder barrel, the end surface of the guide sleeve and the opening end with the sealing piston form an annular cavity; the main oil cavity is not communicated with the annular cavity; the main oil cavity is communicated with the inner cavity of the piston rod through a throttling hole on the sealed piston;

the floating piston is coaxially arranged in the upper end of the piston rod, and the outer circumferential surface of the floating piston is tightly attached to the inner circumferential surface of the piston rod; the lower hinge, the inner circumferential surface of the piston rod and the closed end of the floating piston form the air chamber.

Furthermore, an annular limiting boss coaxial with the upper hinge is processed on the end face of the upper hinge facing the main oil cavity, the outer diameter of the annular limiting boss is smaller than the inner diameter of the cylinder barrel, and more than two radial oil passing grooves distributed along the circumferential direction of the annular limiting boss are processed on the side wall of the annular limiting boss; a connecting oil port communicated with the main oil cavity is formed in the side wall of the cylinder barrel;

the connecting oil port is welded with a joint seat; the joint seat of the front hydro-pneumatic spring and the joint seat of the rear hydro-pneumatic spring are connected and fastened with the balance pipeline through the front spring joint and the rear spring joint respectively, and the main oil cavity of the front hydro-pneumatic spring is communicated with the main oil cavity of the rear hydro-pneumatic spring after sequentially passing through the connecting oil port of the front hydro-pneumatic spring, the balance pipeline and the connecting oil port of the rear hydro-pneumatic spring.

Further, the oil communicating port is opposite to any one of the oil passing grooves.

Furthermore, a high-pressure oil seal, a high-pressure gas seal and two annular floating piston guide belts are arranged on the outer circumferential surface of the floating piston, the high-pressure oil seal is positioned on one side close to the main oil cavity, the high-pressure gas seal is positioned on one side close to the air chamber, and the two floating piston guide belts are respectively arranged on the outer circumferential surfaces of the high-pressure oil seal and the high-pressure gas seal.

Further, an inflation inlet is processed on the lower hinge, one end of the inflation inlet is communicated with the air chamber, the other end of the inflation inlet is communicated with an external air source through a pipeline, and an inflation valve is mounted on the pipeline and used for inflating and deflating the air chamber;

go up the processing of hinge and have the oiling mouth, the one end and the main oil cavity intercommunication of oiling mouth, the other end and outside oil tank intercommunication, outside oil tank passes through the oiling mouth gives main oil cavity fills, the oil drain, makes main oil intracavity is filled with fluid.

Furthermore, the outer circumferential surface of the guide sleeve is tightly attached to the inner circumferential surface of the cylinder barrel, and a static sealing ring and a protection ring are arranged between the guide sleeve and the cylinder barrel for static sealing; the inner circumferential surface of the guide sleeve is tightly attached to the outer circumferential surface of the piston rod, and a first guide belt, a first oil seal, a second guide belt and a dust ring are sequentially arranged between the inner circumferential surface of the guide sleeve and the outer circumferential surface of the piston rod from the upper end to the lower end of the cylinder barrel, so that the guide sleeve and the piston rod are movably sealed.

Furthermore, two third guide belts, a third oil seal and a fourth oil seal are arranged on the outer circumferential surface of the piston with the seal; and the third oil seal and the fourth oil seal are positioned between two third guide belts.

Has the advantages that:

(1) the main oil cavities of the front hydro-pneumatic spring and the rear hydro-pneumatic spring are fixedly connected with a balance pipeline through a front spring joint and a rear spring joint respectively, so that the main oil cavities of the front hydro-pneumatic spring and the rear hydro-pneumatic spring are communicated to form balance suspension; floating pistons are arranged in piston rods of the front hydro-pneumatic spring and the rear hydro-pneumatic spring to form a built-in closed air chamber, and the floating pistons are used for isolating the air chamber from a main oil cavity of the hydro-pneumatic spring; the air chambers in the front hydro-pneumatic spring and the rear hydro-pneumatic spring are respectively filled with air quantities with different pressures to form a high-pressure air chamber and a low-pressure air chamber, wherein the parameters of the high-pressure air chamber correspond to the working pressure of the hydro-pneumatic suspension when the vehicle is fully loaded, and the parameters of the low-pressure air chamber correspond to the working pressure of the hydro-pneumatic suspension when the vehicle is unloaded, so that the use requirements of the empty and full loading of the vehicle can be simultaneously considered, high-pressure and low-pressure piston type energy accumulators in the patent '202020210112.0 energy accumulator vertical balance hydro-pneumatic suspension' and '202020210113.5 energy accumulator horizontal balance hydro-pneumatic suspension' are cancelled, and the purpose of simplifying the structural scheme is achieved.

(2) In addition, because the oil cylinder and the air chamber are highly integrated together, oil can not enter the energy accumulator through a long pipeline any more, so that the problem of overlarge loss along the process of flowing oil is thoroughly solved, the suspension damping characteristic is distorted due to overlarge loss along the process, the elimination of the external piston energy accumulator can also effectively reduce the manufacturing cost, and the assembly and adjustment and replacement efficiency of a product are improved.

(3) The main oil cavity of the hydro-pneumatic spring in the embodiment 1 of the invention is communicated with the annular cavity, the working area of the hydro-pneumatic spring is the area of the piston rod, the oil is in full contact with the inner surface of the cylinder barrel, and the heat generated in the vibration reduction process can be radiated to the external environment to the maximum extent, so that the purpose of inhibiting temperature rise is achieved, the problem of sealing failure caused by abnormal temperature rise is effectively avoided, and the hydro-pneumatic spring is suitable for high-mobility off-road vehicles.

(4) According to the hydro-pneumatic spring in the embodiment 2, the main oil cavity of the hydro-pneumatic spring is not communicated with the annular cavity, the annular cavity is a cavity, the oil seal is arranged on the piston, the inner part of the cylinder barrel can be well protected, so that the phenomenon of oil leakage caused by damage to the surface of the piston rod when the oil seal is arranged on the guide sleeve is avoided, meanwhile, the working area of the hydro-pneumatic spring is the area of the piston, the bearing capacity of the hydro-pneumatic spring can be improved to the maximum extent under the condition that the arrangement space of a vehicle body is limited, and the hydro-pneumatic spring is suitable for heavy carrier vehicles.

Drawings

FIG. 1 is a structural composition diagram of example 1;

FIG. 2 is a structural composition diagram of the front/rear hydro-pneumatic springs of example 1;

FIG. 3 is a cross-sectional view of the upper hinge;

FIG. 4 is a cross-sectional view of the guide sleeve;

FIG. 5 is a cross-sectional view of the floating piston;

FIG. 6 is a cross-sectional view of the master piston;

FIG. 7 is a structural composition diagram of example 2;

FIG. 8 is a structural composition diagram of the front/rear hydro-pneumatic springs of example 2;

fig. 9 is a cross-sectional view of the piston with seal.

Wherein, 1, a cylinder barrel, 2, a piston rod, 3, a guide sleeve, 4, a floating piston, 5, a main piston, 6, a lower hinge, 7, a guide sleeve bolt, 8, an air chamber, 9, a piston bolt, 10, an upper hinge, 11, a front spring joint, 12, a balance pipeline, 13, a rear spring joint, 14, a main oil chamber, 15, an annular chamber, 16, a joint seat, 17, a communication oil port, 18, an oil filling port, 19, an air filling port, 20, an oil through groove, 21, an annular limiting boss, 31, a mounting through hole, 32, a first guide belt, 33, a static seal ring, 34, a protective ring, 35, a dust-proof ring, 36, a first oil seal, 37, a second oil seal, 38, a second guide belt, 41, a high-pressure oil seal, 42, a high-pressure air seal, 43, a floating piston guide belt, 51, an orifice, 52, a piston through hole, 53, a third guide belt, 54, 55, a fourth oil seal, 61, a sealed piston oil seal, 81. front hydro-pneumatic spring, 82 rear hydro-pneumatic spring.

Detailed Description

The invention is described in detail below by way of example with reference to the accompanying drawings.

Example 1:

the embodiment provides a built-in air chamber balanced hydro-pneumatic suspension, referring to the attached figure 1, comprising: the oil-gas spring balance system comprises two oil-gas springs, a front spring joint 11, a rear spring joint 13 and a balance pipeline 12;

the two hydro-pneumatic springs are a front hydro-pneumatic spring 81 and a rear hydro-pneumatic spring 82 respectively; the hydro-pneumatic spring is of a hollow structure, the inner cavity of the hydro-pneumatic spring is a main oil cavity 14, piston rods 2 are mounted in the inner cavities of the hydro-pneumatic spring, the piston rods 2 are of a hollow structure, and floating pistons 4 are arranged in the piston rods 2, so that the inner cavities of the piston rods 2 form built-in air chambers 8;

the front hydro-pneumatic spring 81 is connected with one end of the balance pipeline 12 through the front spring joint 11, and the rear hydro-pneumatic spring 82 is connected with the other end of the balance pipeline 12 through the rear spring joint 13; so that the main oil chamber 14 of the front oil-gas spring 81 is communicated with the main oil chamber 14 of the rear oil-gas spring 82 through the balance pipeline 12;

wherein, with reference to fig. 2-6, the hydro-pneumatic spring comprises: the device comprises a cylinder barrel 1, a piston rod 2, a guide sleeve 3, a floating piston 4, a main piston 5, an upper hinge 10, a lower hinge 6 and a joint seat 16;

the cylinder barrel 1 and the piston rod 2 are both of cylindrical structures with openings at two ends; the two ends of the cylinder barrel 1 are respectively an upper end and a lower end, and the two ends of the piston rod 2 are respectively an upper end and a lower end; the inner circumferential surface of the piston rod 2 is processed by adopting a honing process to improve the surface smoothness and form lubricating cross grains so as to improve the working environment of the sealing element;

the floating piston 4 and the main piston 5 are both of cylindrical structures with one open end and one closed end; the closed end of the main piston 5 is provided with a central through hole; a circle of axial through holes A which are uniformly distributed along the circumferential direction of the main piston 5 are machined in the side wall of the main piston, and the axial through holes AA are throttling holes 51; a third guide belt 53 is arranged on the outer circumferential surface of the main piston 5;

the connection relation of the hydro-pneumatic spring is as follows: the upper hinge 10 is fixedly arranged at the upper end of the cylinder barrel 1 in a welding or threaded connection mode, and an opening at the upper end is closed; the piston rod 2 is coaxially arranged in the cylinder barrel 1, and an annular gap is reserved between the piston rod and the cylinder barrel; the upper end of the piston rod 2 is positioned in the cylinder barrel 1, and the lower end of the piston rod 2 extends out of the lower end of the cylinder barrel 1; the lower hinge 6 is fixedly arranged at the lower end of the piston rod 2 in a welding or threaded connection mode, and an opening at the lower end is closed;

the guide sleeve 3 is arranged in the annular gap and seals one end of the annular gap; the end part of the guide sleeve 3 is provided with a flange, a mounting through hole 31 which is circumferentially arranged on the flange is fixed at the lower end of the cylinder barrel 1 through a guide sleeve bolt 7, the outer circumferential surface of the guide sleeve 3 is tightly attached to the inner circumferential surface of the cylinder barrel 1, and a static sealing ring 33 and a protection ring 34 are arranged between the outer circumferential surface and the inner circumferential surface for static sealing; the inner circumferential surface of the guide sleeve 3 is closely attached to the outer circumferential surface of the piston rod 2, and a first guide belt 32, a first oil seal 36, a second oil seal 37, a second guide belt 38 and a dust ring 35 are sequentially arranged between the inner circumferential surface and the outer circumferential surface from top to bottom (from the upper end to the lower end of the cylinder barrel 1), so that the guide sleeve 3 and the piston rod 2 are dynamically sealed;

a piston through hole 52 which is circumferentially arranged is arranged at the end of the central through hole of the main piston 5, the main piston 5 is fixed at the upper end of the piston rod 2 through the piston through hole 52 and the piston bolt 9, and the upper end opening is closed (wherein, the main piston 5 and the piston rod 2 can also be processed by an integrated forging method); the open end of the main piston 5 is positioned at the other end of the annular gap, a third guide belt 53 on the main piston 5 is in contact with the inner circumferential surface of the cylinder 1, and the third guide belt 53 is used for guiding the movement of the main piston 5 when the main piston 5 reciprocates in the cylinder 1; a main oil chamber 14 is formed among the end of the main piston 5 where the central through hole is located, the inner circumferential surface of the cylinder barrel 1 and the upper hinge 10, an oil filling port 18 is machined on the upper hinge 10, one end of the oil filling port 18 is communicated with the main oil chamber 14, the other end of the oil filling port 18 is communicated with an external oil tank, and the external oil tank fills and discharges oil to the main oil chamber 14 through the oil filling port 18, so that oil is filled in the main oil chamber 14; annular gaps among the outer circumferential surface of the piston rod 2, the inner circumferential surface of the cylinder barrel 1, the end surface of the guide sleeve 3 and the opening end of the main piston 5 form an annular cavity 15; the main oil chamber 14 and the annular chamber 15 are communicated through a throttle hole 51 on the main piston 5; oil in the main oil chamber 14 can enter the annular cavity 15 through the throttle hole 51, and when the main piston 5 reciprocates in the cylinder barrel 1, the oil generates damping force through the throttle hole 51 at high speed, so that the aim of damping vibration from the outside is fulfilled;

the floating piston 4 is coaxially arranged inside the upper end of the piston rod 2; the outer circumferential surface of the floating piston 4 is tightly attached to the inner circumferential surface of the piston rod 2, and more than two sealing rings are arranged between the outer circumferential surface and the inner circumferential surface for dynamic sealing; when the floating piston 4 is located at the farthest position away from the lower hinge 6, the end surface of the main piston 5 can limit the floating piston 4, so that the floating piston 4 is prevented from being separated from the inner cavity of the piston rod 2; the lower hinge 6, the inner circumferential surface of the piston rod 2 and the closed end of the floating piston 4 form the air chamber 8; an inflation inlet 19 is formed in the lower hinge 6, one end of the inflation inlet 19 is communicated with the air chamber 8, the other end of the inflation inlet 19 is communicated with an external air source through a pipeline, an inflation valve is mounted on the pipeline and used for inflating and deflating the air chamber 8, when the air chamber 8 is inflated with air, the air chamber 8 can replace an elastic element in the traditional sense to play a role in elastic buffering, and the typical nonlinear elastic characteristic is achieved; respectively filling air chambers 8 in the front hydro-pneumatic spring 81 and the rear hydro-pneumatic spring 82 with different pressures to form high-pressure and low-pressure air chambers, wherein parameters of the high-pressure air chambers correspond to hydro-pneumatic suspension working pressure when the vehicle is fully loaded, and parameters of the low-pressure air chambers correspond to hydro-pneumatic suspension working pressure when the vehicle is unloaded;

wherein, the outer circumference of the floating piston 4 is provided with a high-pressure oil seal 41, a high-pressure gas seal 42 and two annular floating piston guide belts 43, the high-pressure oil seal 41 is positioned at one side close to the main oil chamber 14, the high-pressure gas seal 42 is positioned at one side close to the air chamber 8, and the two floating piston guide belts 43 are respectively arranged at the outer circumferences of the high-pressure oil seal 41 and the high-pressure gas seal 42;

an annular limiting boss 21 coaxial with the upper hinge 10 is machined on the end face of the upper hinge 10 facing the main oil cavity 14, the outer diameter of the annular limiting boss 21 is smaller than the inner diameter of the cylinder barrel 1, and four radial oil passing grooves 20 evenly distributed along the circumferential direction of the annular limiting boss 21 are machined on the side wall of the annular limiting boss 21; a connecting oil port 17 communicated with the main oil cavity 14 is formed in the side wall of the cylinder barrel 1, and the connecting oil port 17 is opposite to any one oil passing groove 20; the connector base 16 is welded on the connecting oil port 17;

the front hydro-pneumatic spring 81 and the rear hydro-pneumatic spring 82 have the same structure except that the opening direction of the connecting oil port 17 is different; the joint seat 16 of the front hydro-pneumatic spring 81 and the joint seat 16 of the rear hydro-pneumatic spring 82 are respectively connected and fastened with the balance pipeline 12 through a front spring joint 11 and a rear spring joint 13, and the main oil cavity 14 of the front hydro-pneumatic spring 81 is communicated with the main oil cavity 14 of the rear hydro-pneumatic spring 82 after sequentially passing through the connecting oil port 17 of the front hydro-pneumatic spring 81, the balance pipeline 12 and the connecting oil port 17 of the rear hydro-pneumatic spring 82;

the annular limiting boss 21 is used for avoiding the situation that the communicating oil port 17 is interfered or even blocked by the communicating oil port 17 when the main piston 5 is compressed to the limit position, and avoiding the damage of the third guide belt 53 on the outer circumferential surface of the main piston 5, and specifically comprises the following steps: because the outer diameter of the annular limiting boss 21 is smaller than the inner diameter of the cylinder barrel 1, an annular gap a for oil passing is formed between the outer circumferential surface of the annular limiting boss 21 and the inner circumferential surface of the cylinder barrel 1, when the main piston 5 is compressed to a limit position, namely, the closed end of the main piston 5 abuts against the end surface of the annular limiting boss 21, oil in the main oil cavity 14 can enter the balance pipeline 12 through the oil passing groove 20, the annular gap a and the communication oil port 17 in sequence, and meanwhile, the oil in the balance pipeline 12 can be communicated with the oil-gas spring main oil cavity 14 through the communication oil port 17, the annular gap a and the oil passing groove 20 in sequence, so that the problem that the balanced suspension oil circuit is cut off and fails due to interference of the main piston 5 and the communication oil port 17 when the main piston is compressed to the limit position is avoided.

The working principle is as follows: when the front hydro-pneumatic spring 81 and the rear hydro-pneumatic spring 82 work, the upper hinge 10 of the front hydro-pneumatic spring 81 and the upper hinge 10 of the rear hydro-pneumatic spring 82 are connected with the vehicle body; the lower hinge 6 of the front hydro-pneumatic spring 81 and the lower hinge 6 of the rear hydro-pneumatic spring 82 are connected with the axle; the upper hinge 10 and the lower hinge 6 are both provided with center holes, joint bearings are mounted in the center holes, and pin shafts for connection penetrate through the joint bearings and then are connected with the vehicle body or the vehicle axle to realize fixed connection with the vehicle body and the vehicle axle, so that the swing device has large swing allowance and avoids the problems of holding force and clamping stagnation of an oil-gas spring;

when the front hydro-pneumatic spring 81 and the rear hydro-pneumatic spring 82 perform compression stroke actions simultaneously, oil in the main oil cavity 14 firstly enters the annular cavity 15 through the throttling hole 51, damping force is generated to attenuate impact vibration from the outside, and redundant oil pushes the floating piston 4 to move and compresses gas in the air chamber 8 to play a role of elastic buffering; when the front hydro-pneumatic spring 81 and the rear hydro-pneumatic spring 82 perform the return stroke action at the same time, oil in the annular cavity 15 enters the main oil cavity 14 through the throttling hole 51, damping force is generated to attenuate impact vibration from the outside, and meanwhile, gas in the air chamber 8 releases energy to push the floating piston 4 to move so as to extrude the oil in the inner cavity of the piston rod 2 into the main oil cavity 14, so that the main oil cavity 14 is ensured to be filled with the oil all the time, and the idle stroke distortion is avoided; present hydro-pneumatic spring 81 compression, back hydro-pneumatic spring 82 is tensile, perhaps preceding hydro-pneumatic spring 81 is tensile, when back hydro-pneumatic spring 82 compresses, fluid in preceding hydro-pneumatic spring 81 and the back hydro-pneumatic spring 82 will carry out mutual compensation through balance pipeline 12, and the relative balance of different hydro-pneumatic spring inner chamber pressures has been ensured, the condition that the too big part of causing of impact load damaged has been avoided appearing in the single round, the purpose of "peak clipping" has been reached, limit impact load through actual measurement single round suspension can reduce more than 50%, the reliability on vehicle chassis has been showing to be promoted, the stress environment has been improved.

Example 2:

in the present embodiment, on the basis of embodiment 1, the main piston 5 is replaced with a belt sealing piston 61; referring to fig. 7-9, the sealing piston 61 is a cylindrical structure with one end open and one end closed; more than two axial through holes B are processed on the closed end of the sealing piston 61, and the axial through holes B are throttling holes 51; two third guide belts 53, a third oil seal 54 and a fourth oil seal 55 are arranged on the outer circumferential surface of the piston 61 with the seal; the third oil seal 54 and the fourth oil seal 55 are positioned between two third guide belts 53;

the closed end of the sealing piston 61 is fixed at the upper end of the piston rod 2 through a piston bolt 9 arranged in the circumferential direction, and the upper end opening is closed; the open end of the belt sealing piston 61 is positioned at the other end of the annular gap, the third guide belt 53 on the belt sealing piston 61 is in contact with the inner circumferential surface of the cylinder 1, and the third guide belt 53 is used for guiding the movement of the belt sealing piston 61 when the belt sealing piston 61 reciprocates in the cylinder 1; the main oil cavity 14 is formed among the closed end of the sealing piston 61, the inner circumferential surface of the cylinder barrel 1 and the upper hinge 10, an oil filling port 18 is processed on the upper hinge 10, one end of the oil filling port 18 is communicated with the main oil cavity 14, the other end of the oil filling port 18 is communicated with an external oil tank, and the external oil tank fills and discharges oil to the main oil cavity 14 through the oil filling port 18, so that oil is filled in the main oil cavity 14; the annular clearance between the outer circumferential surface of the piston rod 2, the inner circumferential surface of the cylinder barrel 1, the end surface of the guide sleeve 3 and the opening end with the sealing piston 61 forms an annular cavity 15;

the main oil chamber 14 is not communicated with the annular cavity 15, and the third oil seal 54 and the fourth oil seal 55 on the belt sealing piston 61 are used for sealing oil in the main oil chamber 14, so that the reliable isolation of the main oil chamber 14 and the annular cavity 15 is realized;

the main oil chamber 14 is communicated with the inner cavity of the piston rod 2 through a throttling hole 51 on a sealed piston 61; oil in the main oil chamber 14 can enter the inner cavity of the piston rod 2 through the throttling hole 51, and when the piston 61 with the seal reciprocates in the cylinder barrel 1, the oil generates damping force through the throttling hole 51 at high speed, so that the aim of damping vibration from the outside is fulfilled; compared with embodiment 1, the present embodiment arranges the high-pressure oil seal on the piston 61 with the seal, and has the following advantages: 1. the scheme can be adopted under the condition that the arrangement space of the vehicle body is limited, and the annular cavity 15 is changed into a cavity, so that the effective working area of the hydro-pneumatic spring is changed from the original area of the piston rod 2 to the area with the sealing piston 61, and the bearing capacity can be greatly improved; 2. the problems of high-pressure oil seal damage and oil leakage caused by gouging of the outer surface of the piston rod can be effectively solved.

The working principle is as follows: when the front hydro-pneumatic spring 81 and the rear hydro-pneumatic spring 82 perform compression stroke actions simultaneously, oil in the main oil cavity 14 firstly enters the inner cavity of the piston rod 2 through the throttling hole 51, damping force is generated to attenuate impact vibration from the outside, the floating piston 4 is pushed to move at the same time, gas in the air chamber 8 is compressed, and the elastic buffering effect is achieved; when the front hydro-pneumatic spring 81 and the rear hydro-pneumatic spring 82 perform the return stroke action at the same time, the gas in the gas chamber 8 releases energy to push the floating piston 4 to move, so that oil in the inner cavity of the piston rod 2 is squeezed into the main oil cavity 14 through the throttle hole 51, the main oil cavity 14 is ensured to be filled with the oil all the time, the idle stroke distortion is avoided, and the vibration reduction effect is achieved; when current hydro-pneumatic spring 81 compression, back hydro-pneumatic spring 82 stretch, perhaps preceding hydro-pneumatic spring 81 is tensile, back hydro-pneumatic spring 82 compresses, fluid in preceding hydro-pneumatic spring 81 and the back hydro-pneumatic spring 82 will carry out mutual compensation through balance pipeline 12, and ensured the relative balance of different hydro-pneumatic spring inner chamber pressures, avoided the condition that impact load too big caused the part to damage to appear in the single round, reached the purpose of "peak clipping".

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a built-in air chamber balanced hydro-pneumatic suspension which characterized in that includes: two hydro-pneumatic springs and a balance line (12);

the two oil gas springs are respectively a front oil gas spring (81) and a rear oil gas spring (82); the hydro-pneumatic spring is of a hollow structure, the inner cavity of the hydro-pneumatic spring is a main oil cavity (14), piston rods (2) are installed in the inner cavity of the hydro-pneumatic spring, the piston rods (2) are of the hollow structure, and floating pistons (4) are arranged in the piston rods (2), so that the inner cavity of the piston rods (2) forms a built-in air chamber (8);

the main oil cavity (14) of the front oil-gas spring (81) is connected with one end of the balance pipeline (12), and the main oil cavity (14) of the rear oil-gas spring (82) is connected with the other end of the balance pipeline (12); so that the main oil chamber (14) of the front oil-gas spring (81) is communicated with the main oil chamber (14) of the rear oil-gas spring (82) through a balance pipeline (12).

2. The built-in gas chamber balanced hydro-pneumatic suspension as defined in claim 1 wherein the gas chambers (8) in the front hydro-pneumatic spring (81) and the rear hydro-pneumatic spring (82) are filled with different pressures of gas respectively to form high and low pressure chambers, wherein the high pressure chamber parameter corresponds to the hydro-pneumatic suspension operating pressure when the vehicle is fully loaded and the low pressure chamber parameter corresponds to the hydro-pneumatic suspension operating pressure when the vehicle is unloaded.

3. The built-in plenum balanced hydro-pneumatic suspension of claim 2, wherein the hydro-pneumatic spring comprises: the device comprises a cylinder barrel (1), a piston rod (2), a guide sleeve (3), a floating piston (4), a main piston (5), an upper hinge (10) and a lower hinge (6);

the cylinder barrel (1) and the piston rod (2) are both of cylindrical structures with openings at two ends;

the floating piston (4) and the main piston (5) are both of cylindrical structures with one open end and one closed end; the closed end of the main piston (5) is provided with a central through hole; a circle of axial through holes A which are uniformly distributed along the circumferential direction of the main piston (5) are machined in the side wall of the main piston, and the axial through holes A are throttle holes (51);

the connection relation of the hydro-pneumatic spring is as follows: the upper hinge (10) is fixed at the upper end of the cylinder barrel (1) and closes an opening at the upper end; the piston rod (2) is coaxially arranged in the cylinder barrel (1), and an annular gap is reserved between the piston rod and the cylinder barrel; the upper end of the piston rod (2) is positioned in the cylinder barrel (1), and the lower end of the piston rod (2) extends out of the lower end of the cylinder barrel (1); the lower hinge (6) is fixed at the lower end of the piston rod (2) and seals the opening at the lower end;

the guide sleeve (3) is arranged in the annular gap and seals one end of the annular gap;

the end of the main piston (5) where the central through hole is located is fixed at the upper end of the piston rod (2), and the opening of the upper end is closed; the open end of the main piston (5) is positioned at the other end of the annular gap; the main oil cavity (14) is formed among the end of the central through hole of the main piston (5), the inner circumferential surface of the cylinder barrel (1) and the upper hinge (10); annular gaps among the outer circumferential surface of the piston rod (2), the inner circumferential surface of the cylinder barrel (1), the end surface of the guide sleeve (3) and the opening end of the main piston (5) form an annular cavity (15); the main oil cavity (14) is communicated with the annular cavity (15) through a throttling hole (51) on the main piston (5);

the floating piston (4) is coaxially arranged inside the upper end of the piston rod (2), and the outer circumferential surface of the floating piston (4) is tightly attached to the inner circumferential surface of the piston rod (2); the lower hinge (6), the inner circumferential surface of the piston rod (2) and the closed end of the floating piston (4) form the air chamber (8).

4. The built-in plenum balanced hydro-pneumatic suspension of claim 2, wherein the hydro-pneumatic spring comprises: the device comprises a cylinder barrel (1), a piston rod (2), a guide sleeve (3), a floating piston (4), a piston with a seal (61), an upper hinge (10) and a lower hinge (6);

the cylinder barrel (1) and the piston rod (2) are both of cylindrical structures with openings at two ends;

the floating piston (4) and the piston with a seal (61) are both of cylindrical structures with one open end and one closed end; more than two axial through holes B are processed on the closed end of the piston (61) with the seal, and the axial through holes B are throttle holes (51);

the connection relation of the hydro-pneumatic spring is as follows: the upper hinge (10) is fixed at the upper end of the cylinder barrel (1) and closes an opening at the upper end; the piston rod (2) is coaxially arranged in the cylinder barrel (1), and an annular gap is reserved between the piston rod and the cylinder barrel; the upper end of the piston rod (2) is positioned in the cylinder barrel (1), and the lower end of the piston rod (2) extends out of the lower end of the cylinder barrel (1); the lower hinge (6) is fixed at the lower end of the piston rod (2) and seals the opening at the lower end;

the guide sleeve (3) is arranged in the annular gap and seals one end of the annular gap;

the closed end of the sealing piston (61) is fixed at the upper end of the piston rod (2) and closes the opening at the upper end; the open end of the belt sealing piston (61) is positioned at the other end of the annular gap; the main oil cavity (14) is formed among the closed end of the sealing piston (61), the inner circumferential surface of the cylinder barrel (1) and the upper hinge (10); annular gaps among the outer circumferential surface of the piston rod (2), the inner circumferential surface of the cylinder barrel (1), the end surface of the guide sleeve (3) and the opening end of the piston (61) with the seal form an annular cavity (15); the main oil cavity (14) is not communicated with the annular cavity (15); the main oil cavity (14) is communicated with the inner cavity of the piston rod (2) through a throttling hole (51) on a sealed piston (61);

the floating piston (4) is coaxially arranged inside the upper end of the piston rod (2), and the outer circumferential surface of the floating piston (4) is tightly attached to the inner circumferential surface of the piston rod (2); the lower hinge (6), the inner circumferential surface of the piston rod (2) and the closed end of the floating piston (4) form the air chamber (8).

5. The built-in air chamber balance hydro-pneumatic suspension as claimed in claim 3 or 4, wherein an annular limiting boss (21) coaxial with the upper hinge (10) is machined on the end face of the upper hinge (10) facing the main oil chamber (14), the outer diameter of the annular limiting boss (21) is smaller than the inner diameter of the cylinder barrel (1), and more than two radial oil passing grooves (20) distributed along the circumferential direction of the annular limiting boss (21) are machined on the side wall of the annular limiting boss (21); a connecting oil port (17) communicated with the main oil cavity (14) is machined in the side wall of the cylinder barrel (1);

the connecting oil port (17) is welded with a joint seat (16); the joint seat (16) of the front hydro-pneumatic spring (81) and the joint seat (16) of the rear hydro-pneumatic spring (82) are connected and fastened with the balance pipeline (12) through the front spring joint (11) and the rear spring joint (13) respectively, and the main oil cavity (14) of the front hydro-pneumatic spring (81) is communicated with the main oil cavity (14) of the rear hydro-pneumatic spring (82) after sequentially passing through the connecting oil port (17) of the front hydro-pneumatic spring (81), the connecting oil port (17) of the balance pipeline (12) and the connecting oil port (17) of the rear hydro-pneumatic spring (82).

6. The built-in air chamber balanced hydro-pneumatic suspension as claimed in claim 5, wherein the communication oil port (17) is opposite to any one of the oil passing grooves (20).

7. The built-in air chamber balance hydro-pneumatic suspension as claimed in claim 3 or 4, wherein the outer circumferential surface of the floating piston (4) is provided with a high pressure oil seal (41), a high pressure gas seal (42) and two annular floating piston guide belts (43), the high pressure oil seal (41) is positioned at one side close to the main oil chamber (14), the high pressure gas seal (42) is positioned at one side close to the air chamber (8), and the two floating piston guide belts (43) are respectively arranged at the outer circumferential surfaces of the high pressure oil seal (41) and the high pressure gas seal (42).

8. The built-in air chamber balance hydro-pneumatic suspension as claimed in claim 3 or 4, wherein the lower hinge (6) is provided with an inflation inlet (19), one end of the inflation inlet (19) is communicated with the air chamber (8), the other end of the inflation inlet (19) is communicated with an external air source through a pipeline, and an inflation valve is arranged on the pipeline and used for inflating and deflating the air chamber (8);

an oil filling port (18) is processed on the upper hinge (10), one end of the oil filling port (18) is communicated with the main oil cavity (14), the other end of the oil filling port is communicated with an external oil tank, and the external oil tank fills and discharges oil for the main oil cavity (14) through the oil filling port (18), so that oil is filled in the main oil cavity (14).

9. The built-in air chamber balance hydro-pneumatic suspension as claimed in claim 3 or 4, wherein the outer circumferential surface of the guide sleeve (3) is closely attached to the inner circumferential surface of the cylinder barrel (1), and a static sealing ring (33) and a protection ring (34) are arranged between the guide sleeve and the cylinder barrel for static sealing; the inner circumferential surface of the guide sleeve (3) is tightly attached to the outer circumferential surface of the piston rod (2), a first guide belt (32), a first oil seal (36), a second oil seal (37), a second guide belt (38) and a dust ring (35) are sequentially arranged between the inner circumferential surface of the guide sleeve and the outer circumferential surface of the piston rod from the upper end to the lower end of the cylinder barrel (1), and the guide sleeve (3) and the piston rod (2) are dynamically sealed.

10. The built-in air chamber balanced hydro-pneumatic suspension as claimed in claim 4, wherein two third guide belts (53), third oil seals (54) and fourth oil seals (55) are provided on the outer circumferential surface of the piston with seal (61); and the third oil seal (54) and the fourth oil seal (55) are positioned between two third guide belts (53).

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