CN108757806A - The double gas chamber piston accumulators of hydro pneumatic suspension - Google Patents

Abstract

The invention provides a double-air-chamber piston accumulator for oil-gas suspension, which belongs to the technical field of oil-gas suspension. The dual-chamber piston accumulator for oil-pneumatic suspension includes an upper cylinder and a lower cylinder. The inner cross-sectional area of the upper cylinder is not equal to the inner cross-sectional area of the lower cylinder. The upper end of the body is sealed and connected so that the upper cylinder and the lower cylinder are connected. The upper floating piston is set in the upper cylinder, and the lower floating piston is set in the lower cylinder. Between the upper floating piston and the lower floating piston, the upper cylinder or the lower cylinder The body is provided with a limit block, and the middle position of the limit block is provided with an oil hole that penetrates up and down. Between the upper floating piston and the lower floating piston, the oil nozzle is connected to the upper cylinder or the lower cylinder, and the upper cylinder is connected to the upper gas injection through the air channel. Mouth, the lower cylinder body is connected with the injection nozzle through the air passage. The beneficial effect of the present invention is that the effective working areas of the two air chambers are different, and their damping thrusts are different, which can ensure the cushioning and vibration reduction provided by the oil-pneumatic suspension while meeting the requirements of the vehicle under no-load and full-load conditions.

Description

Double-chamber piston accumulator for oil-pneumatic suspension

technical field

The invention relates to the technical field of oil-pneumatic suspension, in particular to a double-chamber piston accumulator for oil-pneumatic suspension.

Background technique

The oil-pneumatic suspension can change the stiffness, which can better cushion and damp the vehicle, and has been widely used in heavy trucks and engineering vehicles. The current oil-pneumatic suspension generally consists of an oil cylinder and a single-chamber accumulator, and its principle is to adjust the stiffness through the air pressure of the air chamber of the single-chamber accumulator. The current single-chamber accumulator cannot ensure that the buffering and vibration reduction provided by the oil cylinder can meet the requirements of the vehicle at no-load and full-load at the same time. Specifically, when adjusting the air pressure of the air chamber of the single-chamber accumulator to meet the vehicle running without load, the piston rod of the oil cylinder is located at the upper end of the oil cylinder under the condition of the vehicle is fully loaded, and the buffer stroke of the piston rod is very small, so that the oil cylinder The buffering and damping effect is poor; when the air pressure of the air chamber of the single-chamber accumulator is adjusted to meet the full load of the vehicle, the piston rod of the oil cylinder is located at the lower end of the oil cylinder when the vehicle is unloaded, and the buffer stroke of the piston rod is also very large. If the air pressure in the air chamber of the accumulator is adjusted to an intermediate value, the buffer stroke of the piston rod in the oil cylinder will be too large, but the height of the chassis of the vehicle will change greatly. Comply with vehicle design requirements.

Contents of the invention

The purpose of the present invention is to provide a dual-chamber piston accumulator for oil-pneumatic suspension, which solves the technical problem that the current accumulator cannot guarantee the cushioning and vibration reduction provided by the oil-pneumatic suspension while meeting the requirements of the vehicle at no-load and full-load .

The invention provides a dual-chamber piston accumulator for oil-gas suspension. The dual-chamber piston accumulator for oil-gas suspension includes an upper cylinder and a lower cylinder. The inner cross-sectional area of the upper cylinder is the same as that of the lower cylinder. The inner cross-sectional area of the body is not equal, the lower end of the upper cylinder body is sealed and connected with the upper end of the lower cylinder body so that the upper cylinder body and the lower cylinder body are connected. The upper floating piston, the lower cylinder is provided with a lower floating piston that can reciprocate linearly along the axis of the lower cylinder, and a limit block is set on the upper cylinder or the lower cylinder between the upper floating piston and the lower floating piston. There is an oil hole through the upper and lower parts in the middle of the block, and an oil nozzle is connected to the upper or lower cylinder between the upper floating piston and the lower floating piston. The upper cylinder is connected to the upper gas injection nozzle through the air passage, and the lower cylinder The body is connected with the air injection nozzle through the airway.

Further, the inner cross-sectional area of the upper cylinder is smaller than the inner cross-sectional area of the lower cylinder, the outer wall of the lower end of the upper cylinder is provided with external threads, the inner wall of the upper end of the lower cylinder is provided with internal threads, and the lower end of the upper cylinder is threaded. upper end of the lower cylinder.

Further, the outer wall of the limiting block is provided with external threads, the inner wall of the lower end of the upper cylinder is provided with internal threads, and the limiting block is threadedly connected to the lower end of the upper cylinder.

Further, the lower end of the limit block is aligned with the lower end of the upper cylinder.

Further, the lower cylinder body is connected with an oil nozzle.

Further, the upper end of the upper cylinder is provided with an upper gas injection nozzle, and the lower end of the lower cylinder is provided with a lower gas injection nozzle.

Further, an upper air channel is arranged inside the upper end of the upper cylinder body, one end of the upper air channel is connected to the upper cylinder body, and the other end of the upper air channel is connected to the upper gas injection nozzle; the lower cylinder body includes a lower cylinder liner, and the lower end of the lower cylinder liner is sealed A lower end cover is connected, and a lower air duct is arranged inside the lower end cover, one end of the lower air duct is connected with the lower cylinder body, and the other end of the lower air duct is connected with the injection nozzle.

Further, the inner wall of the lower end of the lower cylinder sleeve is provided with internal threads, the outer wall of the lower end cover is provided with external threads, and the lower end cover is threadedly connected to the lower end of the lower cylinder sleeve.

Further, a sealing ring is provided between the inner wall of the lower end of the lower cylinder sleeve and the outer wall of the lower end cover.

Further, the oil nozzle is connected with an oil delivery pipeline.

Compared with the prior art, the dual-chamber piston accumulator for oil-pneumatic suspension of the present invention has the following characteristics and advantages:

The dual-chamber piston accumulator for oil-gas suspension of the present invention has a compact structure, takes up less space, and is easy to assemble on a vehicle; it is designed with double chambers, and the two chambers have different effective working areas and different damping thrusts. When the oil-pneumatic suspension is in the state of no-load or full-load of the vehicle, the position of the piston rod in the oil cylinder does not change much. , full-load requirements; the oil-air suspension of existing vehicles can be modified, only the double-chamber piston accumulator of the present invention needs to be replaced with the single-chamber accumulator on the existing vehicle, the transformation cost is low, and it is convenient for large-scale Promotional use.

The features and advantages of the present invention will become clearer after reading the detailed description of the present invention in conjunction with the accompanying drawings.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are For some embodiments of the present invention, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural view of a double-chamber piston accumulator and an oil cylinder in an initial state for an oil-pneumatic suspension;

Fig. 2 is a structural schematic diagram of a double-chamber piston accumulator and an oil cylinder for an oil-pneumatic suspension in an unloaded state of the vehicle;

Fig. 3 is a schematic diagram of the structure of the double-chamber piston accumulator and the oil cylinder for the oil-pneumatic suspension when the vehicle is fully loaded;

Among them, 1. upper cylinder body, 11. upper floating piston, 12. upper gas injection nozzle, 2. lower cylinder body, 21. lower floating piston, 22. lower injection gas nozzle, 23. lower cylinder liner, 24. lower end cover , 3, limit block, 31, oil hole, 4, oil pipeline, 5, oil cylinder, 51, oil chamber, 52, piston rod, 6, oil nozzle, 71, upper air passage, 72, lower air passage, 8, sealing Circle, 91, upper air chamber, 92, lower air chamber.

Detailed ways

As shown in Figures 1 to 3, this embodiment provides a dual-chamber piston accumulator for oil-pneumatic suspension. It is the main part of oil and gas suspension.

The dual-chamber piston accumulator for oil-pneumatic suspension includes an upper cylinder 1 and a lower cylinder 2 . The inner cross-sectional area of the upper cylinder body 1 is not equal to the inner cross-sectional area of the lower cylinder body 2 . In this embodiment, the inner cross-sectional area of the upper cylinder body 1 is smaller than the inner cross-sectional area of the lower cylinder body 2 . The inner cross-sectional area of the upper cylinder body 1 is not equal to the inner cross-sectional area of the lower cylinder body 2, so that the effective working area of the air chamber of the upper cylinder body 1 and the air chamber of the lower cylinder body 2 can be different, so that the upper floating piston 11, The damping thrust of the lower floating piston 21 is different.

The outer wall of the lower end of the upper cylinder body 1 is provided with external threads, and the inner wall of the upper end of the lower cylinder body 2 is provided with internal threads. The upper end of the cylinder is sealed and connected so that the upper cylinder body 1 and the lower cylinder body 2 are connected as a whole.

The upper cylinder 1 is provided with an upper floating piston 11, which can reciprocate in a straight line along the axis of the upper cylinder 1 in the upper cylinder 1, and the upper cylinder 1 forms an upper gas cylinder above the upper floating piston 11. Room 91. The lower cylinder 2 is provided with a lower floating piston 21, which can reciprocate in a straight line along the axis of the lower cylinder 2 in the lower cylinder 2. The lower cylinder 2 forms a lower air chamber below the lower floating piston 21. 92. Between the upper floating piston 11 and the lower floating piston 21, a cylindrical limit block 3 is arranged on the upper cylinder body. The outer wall of the limiting block 3 is provided with external threads, the inner wall of the lower end of the upper cylinder body 1 is provided with internal threads, and the limiting block 3 is threadedly connected to the lower end of the upper cylinder body 1 . The lower end of the limit block 3 is aligned with the lower end of the upper cylinder body 1, so that the upper floating piston 11 can run to the upper surface of the limit block 3, and the lower floating piston 21 can run to the lower surface of the limit block 3, so that the Increase the stroke of the upper floating piston 11 and the lower floating piston 21 in the structural space. The middle position of the limit block 3 is provided with an oil hole 31 that penetrates up and down. In this embodiment, the hydraulic oil enters the space above the lower floating piston 21 in the lower cylinder body 2 through the oil nozzle 6, and can enter the upper cylinder body through the oil hole 31. 1 the space below the upper floating piston 11.

An oil nozzle 6 is connected to the lower cylinder body 2 between the upper floating piston 11 and the lower floating piston 21 . The oil nozzle 6 is connected to the oil chamber 51 of the oil cylinder 5 through the oil delivery pipeline 4 .

The upper end of the upper cylinder 1 is provided with an upper gas injection nozzle 12, and the upper end of the upper cylinder 1 is provided with an upper air channel 71, one end of the upper air channel 71 is connected to the upper cylinder 1, and the other end of the upper air channel 71 is connected to the upper gas injection nozzle 12.

The lower end of the lower cylinder body 2 is provided with a lower injection nozzle 22, and the lower injection nozzle 22 is connected to the lower cylinder body 2 through the lower air passage 72. Specifically, the lower cylinder body 2 includes a lower cylinder sleeve 23 and a lower end cover 24, the inner wall of the lower end of the lower cylinder sleeve 23 is provided with internal threads, the outer wall of the lower end cover 24 is provided with external threads, and the lower end cover 24 is threadedly connected to the lower end of the lower cylinder sleeve 23. A sealing ring 8 is arranged between the inner wall of the lower end of the lower cylinder sleeve 23 and the outer wall of the lower end cover 24 , so that the lower end of the lower cylinder sleeve 23 is sealed and connected to the lower end cover 24 . A lower air duct 72 is arranged inside the lower end cover 24 , one end of the lower air duct 72 is connected to the lower cylinder body 2 , and the other end of the lower air duct 72 is connected to the lower injection nozzle 22 .

As shown in Figure 1, the oil-pneumatic suspension is in the initial state (oil-filled, air-filled state), the oil chamber 51 of the oil cylinder 5 is filled with hydraulic oil, and the oil nozzle 6 of the double-chamber piston accumulator is connected to the oil cylinder 5 through the oil pipeline 4 Oil chamber 51. Inject nitrogen into the upper cylinder 1 through the upper gas injection nozzle 12 and close the upper gas injection nozzle 12 , inject nitrogen into the lower cylinder 2 through the lower injection nozzle 22 and close the lower injection nozzle 22 . In this embodiment, the nitrogen pressures injected into the upper cylinder body 1 and the lower cylinder body 2 are equal, the effective working areas of the upper air chamber 91 and the lower air chamber 92 are different, and the damping thrust of the upper air chamber 91 on the upper floating piston 11 is smaller than that of the lower air chamber 91. The damping thrust of the air chamber 92 to the lower floating piston 21.

As shown in Figure 2, the oil-pneumatic suspension is in the vehicle’s unloaded state. At this time, the force on the piston rod 52 is small during the reciprocating motion, and the hydraulic oil in the oil chamber 51 enters between the upper floating piston 11 and the lower floating piston 21 through the oil nozzle 6. Space. The damping thrust of the upper air chamber 91 on the upper floating piston 11 is relatively small, and the hydraulic oil pushes the upper floating piston 11 to move. At this time, the piston rod 52 is located slightly below the middle of the oil cylinder 5, and the buffer stroke of the piston rod 52 in the oil cylinder 5 Larger, meeting the buffering and vibration reduction requirements of the vehicle under no load.

As shown in Figure 3, the oil-pneumatic suspension is in the fully loaded state of the vehicle. At this time, the piston rod 52 is subjected to a large force during the reciprocating motion, and the hydraulic oil in the oil chamber 51 enters the space between the upper floating piston 11 and the lower floating piston 21 through the oil nozzle 6. space. The damping thrust of the upper air chamber 91 on the upper floating piston 11 is relatively small, and the damping thrust of the lower air chamber 91 on the lower floating piston 21 is relatively large. The hydraulic oil first pushes the upper floating piston 11 to move and then pushes the lower floating piston 21 to move. At this time, The piston rod 52 is located slightly above the middle of the oil cylinder 5, and the buffer stroke of the piston rod 52 in the oil cylinder 5 is relatively large, which meets the buffering and vibration reduction requirements of the vehicle under full load.

The dual-chamber piston type accumulator for the oil-pneumatic suspension of this embodiment has a compact structure, takes up less space, and is easy to assemble on a vehicle. It is designed with double air chambers (upper air chamber 91 and lower air chamber 92). The effective working areas of the two air chambers are different, and their damping thrusts are different. When the oil-pneumatic suspension is in the state of no-load or full-load of the vehicle, the piston rod 52 in the oil cylinder 5 The position changes little, and the cushioning stroke of the piston rod 52 in the oil cylinder 5 is relatively large, which can ensure the cushioning and vibration reduction provided by the oil-pneumatic suspension and meet the requirements of the vehicle at no-load and full-load. The oil-pneumatic suspension of existing vehicles can be modified, only needing to replace the single-chamber accumulator on the existing vehicle with the double-chamber piston accumulator of the embodiment, the modification cost is low, and it is convenient for wide-scale popularization and use.

Of course, the above descriptions are not intended to limit the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or replacements made by those skilled in the art within the scope of the present invention shall also belong to the present invention. protection scope of the invention.

Claims (10)

1. A double-chamber piston accumulator for oil-gas suspension, characterized in that: the double-chamber piston accumulator for oil-gas suspension includes an upper cylinder and a lower cylinder, and the inner cross-sectional area of the upper cylinder is The inner cross-sectional area of the lower cylinder is not equal. The lower end of the upper cylinder is sealed with the upper end of the lower cylinder so that the upper cylinder and the lower cylinder are connected. The upper cylinder is provided with a straight line along the axis of the upper cylinder. The reciprocating upper floating piston, the lower cylinder is provided with a lower floating piston that can reciprocate linearly along the axis of the lower cylinder, and a limit stop is set between the upper floating piston and the lower floating piston on the upper cylinder or the lower cylinder. Block, the middle position of the limit block is provided with an oil hole through up and down, between the upper floating piston and the lower floating piston, there is an oil nozzle connected to the upper cylinder or the lower cylinder, and the upper cylinder is connected to the upper gas injection nozzle through the air passage. , the lower cylinder body is connected with a lower injection gas nozzle through the air passage. 2. The double-chamber piston type accumulator for oil-pneumatic suspension according to claim 1, characterized in that: the inner cross-sectional area of the upper cylinder body is smaller than the inner cross-sectional area of the lower cylinder body, and the lower end outer wall of the upper cylinder body An external thread is provided, an internal thread is provided on the inner wall of the upper end of the lower cylinder body, and the lower end of the upper cylinder body is threadedly connected to the upper end of the lower cylinder body. 3. The double-chamber piston accumulator for oil-pneumatic suspension according to claim 2, characterized in that: the outer wall of the limit block is provided with external threads, and the inner wall of the lower end of the upper cylinder is provided with internal threads, limiting The bit block is threadedly connected to the lower end of the upper cylinder body. 4. The double-chamber piston accumulator for oil-pneumatic suspension according to claim 3, characterized in that: the lower end of the limit block is aligned with the lower end of the upper cylinder. 5. The double-chamber piston accumulator for oil-pneumatic suspension according to claim 1, characterized in that: the lower cylinder body is connected with an oil nozzle. 6. The double-chamber piston accumulator for oil-pneumatic suspension according to claim 1, characterized in that: the upper end of the upper cylinder is provided with an upper air injection nozzle, and the lower end of the lower cylinder is provided with a lower air injection nozzle. 7. The double-chamber piston accumulator for oil-pneumatic suspension according to claim 6, characterized in that: an upper air passage is arranged inside the upper end of the upper cylinder, one end of the upper air passage is connected to the upper cylinder, and the upper air passage The other end of the lower cylinder body is connected to the upper gas injection nozzle; the lower cylinder body includes the lower cylinder liner, the lower end of the lower cylinder liner is sealed and connected with the lower end cover, and the lower air passage is arranged inside the lower end cover, and one end of the lower air passage is connected to the lower cylinder body, and the lower end cover of the lower air passage is connected to the lower cylinder body. The other end is connected to the injection nozzle. 8. The double-chamber piston accumulator for oil-pneumatic suspension according to claim 7, characterized in that: the inner wall of the lower end of the lower cylinder sleeve is provided with internal threads, the outer wall of the lower end cover is provided with external threads, and the lower end cover is threadedly connected The lower end of the lower cylinder liner. 9. The double-chamber piston accumulator for oil-pneumatic suspension according to claim 8, characterized in that a sealing ring is arranged between the inner wall of the lower end of the lower cylinder liner and the outer wall of the lower end cover. 10. The double-chamber piston accumulator for oil-pneumatic suspension according to claim 1, wherein the oil nozzle is connected with an oil pipeline.