CN107642575B - A kind of automobile double-cylinder shock absorber - Google Patents

Abstract

The invention discloses a highly reliable automobile double-cylinder shock absorber, which includes a working cylinder, a piston rod, a first piston, a guide seat, a buffer pad, an airbag spring group and a second piston. The first piston and The second piston is installed in parallel on the piston rod, and the buffer pad and the air bag spring group are installed between the guide base and the second piston. The present invention provides an airbag spring group and a simple piston in a traditional double-cylinder shock absorber. Through the compression deformation of each airbag spring in the airbag spring group, the airbag spring generates a reverse elastic force on the second piston; because the airbag spring and the third piston A small hole is formed between the axial through holes of the two pistons, and the oil is throttled through the small hole, thereby generating an additional damping force value; under the action of the elastic force generated by the air bag spring, the damping effect of the shock absorber is smoother and more effective. When the additional damping force value is generated, the shock absorber works more reliably, thereby improving the damping efficiency of the shock absorber and the smoothness of the car.

Description

A kind of automobile double-cylinder shock absorber

Technical field

The present invention relates to a shock absorber, in particular to a highly reliable automobile double-cylinder shock absorber.

Background technique

The main function of the shock absorber is to suppress the shock when the spring element rebounds after absorbing shock and the impact from the road surface. When the frame and axle vibrate and move relative to each other, the piston inside the shock absorber reciprocates in the oil. The oil flows back and forth through various valves, through holes and normal pores under the action of oil pressure. The valve generates a damping force on the oil, and the friction between the hole wall and the oil forms a damping force on the vibration, thereby consuming the vibration energy, attenuating the vibration, and improving the ride comfort of the car.

However, when the car is driving under harsh driving conditions, the oil pressure of traditional car shock absorbers will increase sharply during operation, making the internal parts of the piston more susceptible to damage. At the same time, the damping force required by the shock absorber is difficult to control. Excessive damping force will affect the comfort of the car when driving on a flat road; insufficient damping force will cause the internal parts of the shock absorber to collide with each other, causing the car to violently Vibration, unable to achieve vibration reduction effect.

Chinese patent CN105889393A discloses "a shock absorber and a vehicle with the same". The shock absorber provides a shock absorber with a coil spring installed between a guide seat and a piston. Since the coil spring has a small stiffness, It is easy to be often compressed to the extreme state, resulting in the weakening or loss of spring elasticity, and even permanent deformation. The invention uses three rubber sealed air bag springs with different internal compressed gas pressures. The three air bag springs are installed in parallel on the piston rod. Since the stiffness of the air bag spring increases with the increase of the compressed gas pressure, the air bag is not easily compressed to the extreme state. , can make the shock absorber achieve better cushioning effect, work reliably and have a long service life.

Contents of the invention

In view of the above-mentioned problems in the prior art, the purpose of the present invention is to propose a highly reliable automotive double-cylinder shock absorber. This shock absorber can effectively slow down the tendency of a sharp increase in oil pressure, and the damping force can change with the automobile. It changes with the change of driving conditions to achieve a more ideal shock absorption effect, thereby improving the smoothness and comfort of the car.

In order to achieve the above objects, the technical solutions adopted by the present invention are:

A high-reliability automotive dual-cylinder shock absorber includes a working cylinder barrel, a piston rod, a first piston, a guide seat, a buffer pad, an air bag spring group and a second piston. The first piston and the second piston are The piston is installed in parallel on the piston rod, and the buffer pad and the air bag spring group are installed between the guide seat and the second piston.

Further, the second piston has axial through holes evenly distributed around the circumference, the second piston is sleeved on the piston rod and placed above the first piston, and the first piston is connected to the first piston. The operation of the second piston does not affect each other.

Further, the airbag spring group is sleeved on the piston rod and placed above the second piston. The airbag spring group is composed of a first airbag spring, a second airbag spring and a third airbag spring. The airbag spring, the second airbag spring and the third airbag spring are installed in parallel. A buffer pad is installed on the first airbag spring, and is installed between the first airbag spring and the second airbag spring and between the second airbag spring and the third airbag spring. There is a buffer pad; the compressed gas pressure in the first airbag spring, the second airbag spring and the third airbag spring increases from top to bottom, and the size of the airbags increases in sequence, making the shock absorber more effective during operation. Smooth and effective.

Further, when the deformation of the first airbag spring and the second airbag spring reaches the maximum, their edges will not contact the working cylinder tube. When the deformation of the third airbag spring reaches the maximum, its edge will not contact the working cylinder tube. The through hole on the second piston is completely closed; the inner layer of each air bag spring is made of air-tight rubber, and the outer layer is made of oil-resistant rubber.

Compared with the prior art, the beneficial effects of the present invention are:

By setting three airbag springs with different air pressures and sizes between the piston and the guide seat, when the car is driving under harsh driving conditions, due to the compression deformation of the airbag spring, the airbag spring generates reverse elastic force on the piston, which can It slows down the tendency of the sharp increase in oil pressure and makes the vibration damping effect of the shock absorber more gentle and effective during the working process, thereby improving the smoothness of the car's driving.

By installing the second piston between the third airbag spring and the first piston, during the expansion stroke of the shock absorber, when the third airbag spring is compressed and deformed, as the deformation increases, the shaft on the second piston is The area of the through hole covered by the third airbag spring is getting larger and larger, and the oil in the upper chamber is throttled through the small hole formed by the third airbag spring and the axial through hole of the second piston under the action of pressure, thereby producing a Additional damping force value.

At the same time, by arranging a buffer pad between the upper end of the first airbag spring and each airbag spring, the force of each airbag spring during the compression process is more uniform, and it can play a guiding role and reduce the stress of the airbag spring. The friction between the shock absorber and the working cylinder wall during the working process makes the shock absorber work more reliably and extends the life of the shock absorber.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

Figure 2 is a top view of the second piston of the present invention.

Figure 3 is a cross-sectional view of the airbag spring of the present invention.

Reference signs: guide seat 1, piston rod 2, working cylinder 3, buffer pad 4, first air bag spring 5, second air bag spring 6, third air bag spring 7, second piston 8, axial through hole 9, The first piston 10 and the air bag spring group 11.

Detailed ways

The technical solutions in the embodiments of the present invention will be further described below with reference to the accompanying drawings in the embodiments of the present invention. The drawings are only used to illustrate the present invention and do not represent the actual structure and true proportions of the present invention.

Please refer to Figures 1 to 3. Figure 1 is a schematic structural diagram of the present invention, a highly reliable automotive dual-cylinder shock absorber, including a working cylinder 3, a piston rod 2, a first piston 10, a guide base 1, Cushion pad 4, airbag spring group 11 and second piston 8. The first piston 10 and the second piston 8 are installed in parallel on the piston rod 2. The cushion pad 4 and the airbag spring group 11 are both Installed between the guide seat 1 and the second piston 8 .

Figure 2 is a top view of the second piston of the present invention. The second piston 8 has axial through holes 9 evenly distributed around the circumference. The second piston 8 is sleeved on the piston rod 2 and placed on the Above the first piston 10, the operations of the first piston 10 and the second piston 8 do not affect each other.

Figure 3 is a cross-sectional view of the airbag spring of the present invention. The airbag spring group 11 is sleeved on the piston rod 2 and placed above the second piston 8. The airbag spring group 11 is composed of a first airbag spring 5 and a third airbag spring. The second airbag spring 6 and the third airbag spring 7 are constituted. The first airbag spring 5, the second airbag spring 6 and the third airbag spring 7 are installed in parallel. A buffer pad 4 is installed on the first airbag spring 5. The first airbag spring 5 and Cushion pads 4 are installed between the second airbag springs 6 and between the second airbag spring 6 and the third airbag spring 7; the compressed gas pressure in the first airbag spring 5, the second airbag spring 6 and the third airbag spring 7 Increasingly from top to bottom, the size of the airbag increases successively, making the vibration damping effect of the shock absorber more gentle and effective during the working process.

When the deformation of the first airbag spring 5 and the second airbag spring 6 reaches the maximum, their edges will not contact the working cylinder tube. When the deformation of the third airbag spring 7 reaches the maximum, its edges will not contact the working cylinder tube. The through hole on the second piston 8 will be completely closed.

Working principle of this embodiment:

When the shock absorber is stretched, the first piston 10, the second piston 8 and the airbag spring group 11 move upward along with the piston rod 2. When the buffer pad 4 contacts the guide seat 1, the first airbag spring 5 is compressed, and then As the compression amount increases, the first airbag spring 5, the second airbag spring 6 and the third airbag spring 7 are compressed simultaneously. As the deformation amount of the third airbag spring 7 increases, the axial passage on the second piston 8 is The area of the hole 9 covered by the third air bag spring 7 is getting larger and larger. Under the action of pressure, the oil in the upper chamber is throttled through the small hole formed by the third air bag spring 7 and the axial through hole 9 of the second piston 8, thereby An additional damping force value is generated; the 11 groups of air bag springs and the formed small holes jointly provide additional damping force for the shock absorber. When the shock absorber is compressed, the compressed air bag spring group 11 exerts a reaction force on the second piston 8, pushing the piston to move downward rapidly so that the damping force generated by the shock absorber is smaller, so as to fully utilize the sleeve. The elasticity of the elastic elements on the shock absorber cushions the impact.

Claims (1)

1. An automobile double-cylinder type shock absorber comprises a working cylinder barrel (3), a piston rod (2), a first piston (10), a guide seat (1), a cushion pad (4), an air bag spring group (11) and a second piston (8); the device is characterized in that the first piston (10) and the second piston (8) are arranged on the piston rod (2) in series, and the cushion pad (4) and the air bag spring group (11) are arranged between the guide seat (1) and the second piston (8);

the second piston (8) is provided with axial through holes (9) uniformly distributed along the circumference, the second piston (8) is sleeved on the piston rod (2) and is arranged above the first piston (10), and the working of the first piston (10) and the working of the second piston (8) are not affected;

the air bag spring set (11) is sleeved on the piston rod (2) and is arranged above the second piston (8), the air bag spring set (11) is composed of a first air bag spring (5), a second air bag spring (6) and a third air bag spring (7), the first air bag spring (5), the second air bag spring (6) and the third air bag spring (7) are arranged in series, the first air bag spring (5) is provided with a buffer pad (4), and the buffer pad (4) is arranged between the first air bag spring (5) and the second air bag spring (6) and between the second air bag spring (6) and the third air bag spring (7); the air pressure of compressed air in the first air bag spring (5), the second air bag spring (6) and the third air bag spring (7) is sequentially increased from top to bottom, and the size of the air bags is sequentially increased;

when the deformation of the first air bag spring (5) and the second air bag spring (6) reaches the maximum, the edges of the first air bag spring and the second air bag spring are not contacted with the working cylinder barrel (3), and when the deformation of the third air bag spring (7) reaches the maximum, the edges of the third air bag spring can not completely seal the axial through holes (9) on the second piston (8).