CN205064675U - Single piston rod double -cylinder section of thick bamboo oil/gas spring jar - Google Patents

Abstract

The utility model proposes an oil-pneumatic spring cylinder with a single piston rod and two cylinders, which is equivalent to two oil-pneumatic spring cylinders sharing one piston rod, each with an independent cylinder barrel at both ends, each assembled into an independent oil-pneumatic spring cylinder, one end of the oil-pneumatic spring cylinder The oil-pneumatic spring cylinder is filled with high-pressure nitrogen, and the other end of the oil-pneumatic spring cylinder is filled with low-pressure nitrogen, which is equivalent to the superimposition of two springs with unequal stiffness. After the load reaches a certain value, the two oil-pneumatic spring cylinders work together in series to meet the requirements of a wide range of effective stiffness changes and have a suitable buffer stroke for both no-load and full-load conditions.

Description

Single piston rod double cylinder oil-pneumatic spring cylinder

technical field

The utility model belongs to an oil-pneumatic spring cylinder, in particular to a single-piston-rod double-cylinder oil-pneumatic spring cylinder.

Background technique

The current oil-pneumatic spring cylinder generally adjusts the stiffness through the inflation pressure, and also changes the damping or stiffness through the structure of the piston or cylinder, but the range of effective stiffness is small, or the buffer is too short when the stiffness is high, and the oil-pneumatic spring is extended. The stroke of the cylinder is limited by the space. For example, the oil-pneumatic spring cylinder for vehicles needs to have a good cushioning stroke when it is empty and full. If there is a cushioning effect when it is empty, the cushioning effect is poor when it is full. The initial stiffness is changed by the inflation pressure to ensure the cushioning effect when it is full. Good, but unladen it is too stiff and the cushioning is poor. The increased travel is limited by the height of the vehicle.

Contents of the invention

In order to solve the shortcoming of the existing oil-pneumatic spring cylinder with a small effective stiffness variation range, the utility model proposes a single-piston-rod double-cylinder oil-pneumatic spring cylinder.

For this reason, the technical scheme of the utility model is as follows: a single piston rod double-cylinder oil-gas spring cylinder, which is characterized in that: an independent cylinder is respectively arranged at both ends, and the cylinder becomes an independent cylinder by assembling with the bottom of the cylinder, the cylinder head and the piston. The two ends of a piston rod are respectively connected with the pistons of the two ends of the oil and gas spring cylinder; one oil and gas spring cylinder is filled with high pressure nitrogen, and the other is filled with low pressure nitrogen, and the two ends of the piston rod have single To the valve, the piston has a damping hole;

Two independent oil-pneumatic spring cylinders are equivalent to the superposition of two springs with unequal stiffness. When the load is low, the oil-pneumatic spring cylinder filled with low-pressure nitrogen works; when the load reaches a certain value, the oil-pneumatic spring cylinder filled with high-pressure nitrogen, The oil-gas spring cylinders with low-pressure nitrogen work together in series to meet the wide-range variation requirements of effective stiffness and have suitable buffer strokes at no-load and full-load conditions.

Beneficial effects: with the utility model, when the load is empty or low, the oil-pneumatic spring cylinder filled with low-pressure nitrogen is compressed, because the filling pressure of the oil-pneumatic spring cylinder filled with high-pressure nitrogen is high, which is equivalent to a rigid body, and only the oil-pneumatic cylinder filled with low-pressure nitrogen The one-way valve and damping hole at one end of the spring cylinder complete the functions of the elastic body and the shock absorber. When the load reaches a certain value, the remaining buffer stroke of the oil-pneumatic spring cylinder filled with low-pressure nitrogen becomes shorter, and the cushioning effect becomes worse. The oil-pneumatic spring cylinder of high-pressure nitrogen starts to compress, and works together with the oil-pneumatic spring cylinder filled with low-pressure nitrogen, so that it has a larger buffer stroke and has a good buffer effect and vibration reduction effect.

Description of drawings

Fig. 1 is a structural schematic diagram (compressed state) of the utility model.

Fig. 2 is a schematic diagram of the fully extended state of the utility model.

As shown in the figure: 1. Cylinder bottom; 2. Piston; 3. Cylinder barrel; 4. Cylinder head; 5. Piston rod; 6. Damping hole; 7. Check valve;

detailed description

As shown in Figure 1, the single-piston-rod double-cylinder oil-pneumatic spring cylinder includes an independent cylinder 3 at each end, and the cylinder 3 passes through the cylinder bottom 1, cylinder head 4, piston 2, (sealing and guiding device) Assembled into an independent oil-pneumatic spring cylinder; the sealing and guiding device are conventional technologies, and will not be described in detail here; the two ends of a piston rod 5 are respectively connected with the piston 2 of the oil-pneumatic spring cylinder at both ends; one oil-pneumatic spring cylinder is filled with High-pressure nitrogen gas B, an oil-gas spring cylinder filled with low-pressure nitrogen gas A, a check valve 7 at both ends of the piston rod, and a damping hole 6 on the piston;

Two independent oil-pneumatic spring cylinders are equivalent to the superposition of two springs with unequal stiffness. When the load is low, the oil-pneumatic spring cylinder filled with low-pressure nitrogen B works; when the load reaches a certain value, the oil-pneumatic spring cylinder filled with high-pressure nitrogen A , The oil-pneumatic spring cylinders filled with low-pressure nitrogen B work together in series to meet the wide-range change requirements of effective stiffness and have suitable buffer strokes at no-load and full-load.

As shown in Figure 2, when there is no load, both ends of the piston rod are in a fully extended state, and the upper and lower cylinders are refueled and inflated according to the calculated oil-air ratio, for example, the upper end is inflated with 0.8MPa, and the lower end is inflated with 4MPa. When the system pressure reaches 4MPa, the lower end also begins to compress, and when the lower end is compressed to the remaining 20%, the system pressure can be 20MPa, so within the range of 25 times the load change, the oil and gas spring cylinder can It has good cushioning and vibration reduction effect. And commonly used single-cylinder single-piston-rod oil-pneumatic spring cylinder pressure reaches 25 times change, stroke only has 4% left, and cushioning effect is very poor. The working principle of the single oil-pneumatic spring cylinder at the upper and lower ends is the same as that of the general single-chamber oil-pneumatic spring cylinder: when the external load has an impact peak, the piston rod 5 is compressed into the cavity, and the hydraulic oil passes through the non-rod cavity through the one-way valve and damping The hole enters the rod cavity, because the internal nitrogen volume becomes smaller, the pressure increases, and quickly reaches a balance with the peak value of the load, which acts as a buffer; when the peak value becomes smaller, the load is less than the thrust generated by the nitrogen gas, and the piston rod is extended. At this time, the single The directional valve is in the closed pressure state, and the hydraulic oil in the rod chamber flows into the rodless chamber through the damping hole, so that the recovery of the elastic body formed by nitrogen compression is blocked, and the vibration is reduced.

Claims (1)

1. single-piston rod twin-tub cylinder hydro-pneumatic spring cylinder, is characterized in that: respectively there is an independently cylinder barrel at two ends, and cylinder barrel is by becoming an independently hydro-pneumatic spring cylinder with cylinder bottom, cylinder cap, Piston assembling; The two ends of a piston rod are connected with the piston of two ends hydro-pneumatic spring cylinder respectively; Be filled with high pressure nitrogen in a hydro-pneumatic spring cylinder, be filled with low-pressure nitrogen in a hydro-pneumatic spring cylinder, there is one-way valve at the two ends of piston rod, and piston has damping hole;

Two independently hydro-pneumatic spring cylinder be equivalent to the unequal springs superposition of two rigidity, when low load, be filled with the hydro-pneumatic spring cylinder working of low-pressure nitrogen; After load reaches certain value, the hydro-pneumatic spring cylinder being filled with high pressure nitrogen, the hydro-pneumatic spring cylinder series connection being filled with low-pressure nitrogen work together, and the wide variation reaching effective rigidity requires all there is suitable cushion stroke with unloaded with full load.