CN219472622U - Single-cylinder nitrogen shock absorber and hydraulic buffering mechanism thereof - Google Patents

Abstract

A single-cylinder nitrogen damper and a hydraulic buffer mechanism thereof belong to the technical field of dampers. The utility model comprises a high-pressure cylinder body arranged at the inner bottom of the oil cylinder and a high-pressure head part arranged at one end of the piston rod in the oil cylinder, wherein the high-pressure cylinder body is opened towards one end of the high-pressure head part, and the high-pressure head part is matched with the high-pressure cylinder body. The utility model can effectively consider the safety of vehicle running and the comfort of driving.

Description

Single-cylinder nitrogen shock absorber and hydraulic buffering mechanism thereof

Technical Field

The utility model relates to the technical field of vibration dampers, in particular to a single-cylinder nitrogen vibration damper and a hydraulic buffering mechanism thereof.

Background

In single cylinder nitrogen shock absorber applications, road conditions are severe because most of the use scenarios are non-paved roads. For example: crushed stone pavements, washboard pavements and other large-fluctuation pavements, cannonball pits and the like. When the vehicle runs at a high speed on a severe road surface, the motion stroke of the suspension is larger, the condition that the shock absorber with certain frequency compresses the buffer block can occur, the comfort requirement of people on driving is greatly improved, the suspension spring is required to be softer, the comfort is improved to a certain extent, but the probability that the shock absorber compresses the buffer block is further improved due to the fact that the suspension spring is softer, and the vehicle runs on a large hollow road surface at a high speed for a long time.

In a damper of conventional design, the suspension springs soften, mainly with the following consequences:

1. the shock absorber frequently compresses and collides with the buffer block, and the service life of the buffer block is greatly reduced;

2. the impact buffer block has the advantages that at the moment of impact, the suspension is almost in rigid connection with the tire and the vehicle body, and the increased impact is transmitted to the driver, so that poor experience is caused;

3. the springs are soft, and under the condition that the shock absorber is unchanged, the vehicle runs on a large hollow road surface at a high speed, so that the vehicle is easy to fall down due to the operability of the vehicle caused by the too soft suspension, the vehicle is easy to overturn, and life hazards are caused to drivers and passengers.

In the prior art, as disclosed in chinese patent No. ZL201810832458.1, a hydraulic buffer structure of a shock absorber is disclosed, which comprises a working cylinder and a buffer cylinder sleeve coaxially and fixedly arranged in the working cylinder, wherein a piston rod at the lower part of the buffer cylinder sleeve is provided with a buffer piston adapted to the inner wall of the buffer cylinder sleeve, a buffer cavity is formed in an area surrounding the buffer piston and the buffer cylinder sleeve above the buffer piston, a flow limiting hole for communicating the buffer cavity with a lower cavity is formed in the buffer piston, a one-way valve is further arranged on the buffer piston, and the conduction direction of the one-way valve is from the lower cavity to the buffer cavity. When the piston rod moves upwards, a high-pressure area is formed in the buffer cavity, oil can only flow out of the limiting hole on the buffer piston, and oil discharge resistance is increased, so that the movement speed of the piston rod is slowed down; when the piston rod moves downwards, the one-way valve is forced to be opened, and at the moment, oil can flow out of the flow limiting hole on the buffer piston and also can flow out of the valve hole of the one-way valve, so that the damping force is not influenced.

However, in the prior art, the damping force of the whole stroke of the piston rod is often increased, and as in the above patent, the damping force in the whole upward movement process of the piston rod is increased, and although the buffering effect can be improved, the driving safety is ensured, but the driving comfort is greatly affected.

Disclosure of Invention

The utility model aims to solve the problems in the prior art and provide a single-cylinder nitrogen shock absorber and a hydraulic buffer mechanism thereof, which can effectively consider the running safety of a vehicle and the driving comfort.

The utility model aims at realizing the following technical scheme:

the utility model provides a single cylinder nitrogen damper's hydraulic pressure buffer gear, includes the high-pressure cylinder body of locating the interior bottom of hydro-cylinder, locates the piston rod and is in the high-pressure head of hydro-cylinder interior one end, the one end opening of high-pressure head is faced to the high-pressure cylinder body, high-pressure head and high-pressure cylinder body looks adaptation.

The working principle of the utility model is as follows: when the vehicle runs on a relatively stable or rough road surface, the expansion range of the high-pressure head part cannot enter the high-pressure cylinder body, namely the working state of the shock absorber is not different from that of a conventional shock absorber, and the driving comfort is ensured. When the vehicle runs on a bumpy road with larger fluctuation, the compression range of the vehicle suspension is enlarged, the expansion range of the piston rod is also enlarged, and when the high-pressure head part at the end part of the piston rod is about to enter the high-pressure cylinder, high pressure is generated in the high-pressure cylinder to prevent or slow down the compression of the piston rod, so that the vehicle suspension is hardened, a certain supporting effect is achieved on the running posture of the vehicle, and safety problems such as vehicle overturning and the like are avoided.

Preferably, the high-pressure cylinder body comprises a connecting seat and a main cylinder body, and a matched connecting hole is formed between the connecting seat and the inner bottom surface of the oil cylinder.

Preferably, the high-pressure head part comprises a guide post, a compression head, a limit gasket and a lock nut; the guide post is sleeved on the piston rod, the first end of the guide post is abutted against the piston, and the second end of the guide post is provided with a limiting step in the circumferential direction; the compression sleeve is sleeved at the second end of the guide post; the limiting gasket is sleeved on the piston rod and props against the second end of the guide post; the locking nut is in threaded connection with the piston rod and compresses the limiting gasket; the compression head is limited between the limiting step and the limiting gasket.

Preferably, the compression head is in clearance fit with the guide post.

Preferably, the opening of the high-pressure cylinder body is provided with an inner chamfer.

Preferably, in the present utility model, an outer chamfer is provided at an end of the high-pressure head portion facing the high-pressure cylinder.

Preferably, the bottom of the high-pressure cylinder body is provided with an overflow valve.

Preferably, the overflow valve comprises an overflow hole and a one-way valve plate, and the one-way valve plate is arranged on the outer bottom surface of the high-pressure cylinder body.

The utility model also provides a single-cylinder nitrogen damper, which comprises an oil cylinder, a piston rod and a hydraulic buffer mechanism of the single-cylinder nitrogen damper.

The utility model has the advantages that:

1. the comfort of the vehicle when running on a relatively stable or rough road surface is ensured, and the safety of the vehicle when running on a rough road surface with large fluctuation is simultaneously considered;

2. the high-pressure head and the high-pressure cylinder are simple in structure, convenient to install and easy to popularize and use;

3. the chamfer structures of the high-pressure head and the high-pressure cylinder body and the clearance fit structure of the compression head and the guide post ensure that the high-pressure head can smoothly enter the high-pressure cylinder body, and the stability of the action of the shock absorber is ensured;

4. the overflow valve at the bottom of the high-pressure cylinder body avoids the damage of the cylinder body caused by the overhigh pressure.

Drawings

FIG. 1 is a cross-sectional view of a hydraulic damping mechanism of a mono-tube nitrogen damper according to the present embodiment;

fig. 2 is a schematic structural diagram of the high-pressure cylinder in fig. 1:

FIG. 3 is a schematic view of the high voltage header of FIG. 1;

fig. 4 is a schematic structural view of a single-cylinder nitrogen damper according to the present embodiment.

Detailed Description

The utility model will be described in further detail with reference to the drawings and the detailed description.

As shown in fig. 1, this embodiment provides a hydraulic buffer mechanism of a single-cylinder nitrogen shock absorber, including a high-pressure cylinder 1 and a high-pressure head 2, the high-pressure cylinder 1 is disposed at the bottom in the cylinder 3, that is, the most distal end of the compression stroke of the piston rod 4, the high-pressure head 2 is disposed at one end of the piston rod 4 in the cylinder 3, the high-pressure cylinder 1 is opened towards one end of the high-pressure head 2, and the high-pressure head 2 is adapted to the high-pressure cylinder 1, that is, the high-pressure head 2 can be seamlessly stretched in the high-pressure cylinder 1.

Specifically, as shown in fig. 2, the high-pressure cylinder 1 includes a connecting seat 11 and a main cylinder 12 that are rigidly connected, and a connecting hole that is matched is provided between the connecting seat 11 and the inner bottom surface of the cylinder 3, so that the whole high-pressure cylinder is mounted on the inner bottom surface of the cylinder by bolts. In order to avoid that the compression amplitude of the piston rod 4 is too large, so that the pressure in the high-pressure cylinder 1 is too high and the cylinder is damaged, an overflow valve is arranged on the connecting seat 11, and the overflow valve specifically comprises an overflow hole 111 and a one-way valve plate 112 arranged on the outer bottom surface of the connecting seat 11, namely, when the pressure in the high-pressure cylinder is too large and the one-way valve plate 112 is jacked up, the oil in the high-pressure cylinder can be released to a certain extent, and the released oil can enter the oil storage chamber 5 shown in fig. 4. It should be noted that, the overflow holes 111 may be generally provided in a plurality of annular distribution to ensure timely release of the high-pressure oil. In addition, in order to ensure that the high-pressure head 2 can quickly and smoothly enter the high-pressure cylinder 1, an inner chamfer 121 is provided at the opening of the high-pressure cylinder 1 to form an introduction effect on the high-pressure head.

As shown in fig. 3, the high-pressure head 2 specifically includes a guide post 21, a compression head 22, a limit spacer 23, and a lock nut 24; the guide post 21 is sleeved on the piston rod 4, the first end of the guide post abuts against the piston 6, and the second end of the guide post is circumferentially provided with a limiting step 211; the compression head 22 is sleeved at the second end of the guide post 21; the limiting gasket 23 is sleeved on the piston rod 4 and props against the second end of the guide post 21; the lock nut 24 is in threaded connection with the piston rod 4 and compresses the limit gasket 23; the compression head 22 is restrained between the restraining step 211 and the restraining pad 23. The whole high-pressure head mainly utilizes the guide post to provide reliable mounting position for the compression head, is convenient for dismouting maintenance simultaneously. In order to ensure that the compression head can quickly and smoothly enter the high-pressure cylinder, on one hand, the compression head 22 is provided with an outer chamfer 221 to match with an inner chamfer 121 of the high-pressure cylinder 1, so as to further improve the guiding effect; on the other hand, the compression head 22 and the guide post 21 are in clearance fit, namely a certain radial movable clearance is formed between the compression head 22 and the guide post 21, so that the compression head can adapt to the guiding action of the inner chamfer of the high-pressure cylinder body and the outer chamfer of the compression head more quickly and adaptively, and the compression head can enter the high-pressure cylinder body quickly and smoothly.

In summary, the working principle of the hydraulic buffer mechanism is as follows: when the vehicle runs on a relatively stable or rough road surface, the expansion range of the high-pressure head 2 cannot enter the high-pressure cylinder body 1, namely the working state of the shock absorber is not different from that of a conventional shock absorber, and the driving comfort is ensured. When the vehicle runs on a bumpy road with large fluctuation, the expansion range of the piston rod 4 is also enlarged due to the fact that the compressed amplitude of the vehicle suspension is enlarged, when the high-pressure head 2 at the end of the piston rod is about to enter the high-pressure cylinder 1, high pressure is generated in the high-pressure cylinder 1, compression of the piston rod 4 is prevented or slowed down, the vehicle suspension is hardened, a certain supporting effect is achieved on the running posture of the vehicle, and at the moment, the buffer block 7 does not touch the cylinder cover. If the maximum supporting force generated in the high-pressure cylinder is insufficient to support the running state of the vehicle, the piston rod 4 and the high-pressure head 2 further extend into the high-pressure cylinder 1, meanwhile, as the pressure in the high-pressure cylinder 1 reaches the maximum value, the overflow valve at the bottom is opened, and the oil is gradually released until the buffer block 7 touches the cylinder cover, so that the suspension is supported.

As shown in fig. 4, this embodiment further provides a single-cylinder nitrogen damper, which includes the cylinder 3, the piston rod 4, the oil storage chamber 7, and a hydraulic buffer mechanism of the single-cylinder nitrogen damper as described above, and the specific structure and working principle thereof are as described above, and are not described herein.

The foregoing is merely a preferred embodiment of the present utility model, which is based on one implementation of the overall concept of the present utility model, and the scope of the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present utility model should be covered by the scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims (9)

1. The hydraulic buffer mechanism of the single-cylinder nitrogen shock absorber is characterized by comprising a high-pressure cylinder body arranged at the inner bottom of the oil cylinder and a high-pressure head part arranged at one end of a piston rod in the oil cylinder, wherein the high-pressure cylinder body is opened towards one end of the high-pressure head part, and the high-pressure head part is matched with the high-pressure cylinder body.

2. The hydraulic buffer mechanism of a mono-cylinder nitrogen shock absorber according to claim 1, wherein the high pressure cylinder body comprises a connecting seat and a main cylinder body, and a matched connecting hole is arranged between the connecting seat and the inner bottom surface of the oil cylinder.

3. The hydraulic buffer mechanism of a mono-tube nitrogen shock absorber according to claim 1, wherein the high pressure head comprises a guide post, a compression head, a limit gasket and a lock nut; the guide post is sleeved on the piston rod, the first end of the guide post is abutted against the piston, and the second end of the guide post is provided with a limiting step in the circumferential direction; the compression sleeve is sleeved at the second end of the guide post; the limiting gasket is sleeved on the piston rod and props against the second end of the guide post; the locking nut is in threaded connection with the piston rod and compresses the limiting gasket; the compression head is limited between the limiting step and the limiting gasket.

4. A hydraulic cushioning mechanism for a mono-tube nitrogen shock absorber as set forth in claim 3 wherein said compression head is in clearance fit with said guide post.

5. The hydraulic buffer mechanism of a mono-tube nitrogen shock absorber according to claim 1, wherein an inner chamfer is provided at the opening of the high pressure cylinder.

6. The hydraulic buffer mechanism of a mono-tube nitrogen shock absorber according to claim 1, wherein an outer chamfer is provided at an end of the high pressure head portion facing the high pressure cylinder.

7. The hydraulic buffer mechanism of a mono-tube nitrogen shock absorber according to claim 1, wherein the bottom of the high pressure cylinder is provided with an overflow valve.

8. The hydraulic buffer mechanism of a mono-tube nitrogen shock absorber according to claim 7, wherein the overflow valve comprises an overflow hole and a one-way valve plate, and the one-way valve plate is arranged on the outer bottom surface of the high pressure cylinder body.

9. A single-cylinder nitrogen damper, comprising an oil cylinder and a piston rod, and further comprising a hydraulic buffer mechanism of the single-cylinder nitrogen damper according to claim 1.