Double-barrel and double-piston barrel type hydraulic shock absorber

Abstract

The utility model belongs to the technical field of shock absorbers, and particularly relates to a double-barrel double-piston barrel type hydraulic shock absorber which comprises an outer piston cylinder, an inner piston cylinder, piston rods and an adjusting assembly, the inner piston cylinder extends into the outer piston cylinder and is provided with a first piston head in sliding connection, and the piston rod extends into the inner piston cylinder and is provided with a second piston head in sliding connection. A first through hole and a second through hole are formed in the first piston head, a third through hole is formed in the second piston head, the adjusting assembly is installed on the piston rod and used for changing the liquid passing amount of the third through hole, the outer piston cylinder and the inner piston cylinder are both filled with damping liquid, and when the piston rod is compressed faster, the liquid passing amount of the third through hole is smaller, and the damping liquid passes through the third through hole. The adjusting assembly is arranged on the piston rod to adjust the liquid passing amount of the third through hole, namely, the size of the third through hole is changed, so that when the piston rod is compressed faster, the liquid passing amount of the third through hole is smaller, the road surface where a vehicle runs is more uneven, the damping force of the shock absorber is larger, and the shock absorption effect is effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of shock absorbers, and particularly relates to a double-tube and double-piston cylinder type hydraulic shock absorber. Background Art

[0002] A shock absorber is a device used to suppress vibration and impact. It is usually installed on vehicles such as cars, motorcycles and electric vehicles to improve the smoothness of the vehicle's driving. When the vehicle encounters an uneven road surface during driving, although the shock-absorbing spring can filter out most of the vibration, the spring itself will still have reciprocating motion. The shock absorber is used to suppress the jumping of the spring to ensure the smoothness and comfort of the vehicle's driving. The most common is the cylinder-type hydraulic shock absorber.

[0003] The working principle of the shock absorber is mainly based on the generation of damping force. When encountering vibration, the piston in the shock absorber will move up and down, and the shock absorber cavity is filled with oil. Under the push of the piston, the oil flows from one cavity to another through different pores; in this process, the friction between the pore wall and the oil and the internal friction between the oil molecules form a damping force on the vibration, converting the vibration energy of the vehicle into heat energy of the oil, which is absorbed by the shock absorber and dissipated into the atmosphere.

[0004] For example, Chinese patent application number (CN201910387048.5) discloses a double-tube double-piston vehicle shock absorber, including an inner working cylinder and an outer working cylinder, the inner working cylinder including a piston rod, an inner piston and an inner cylinder body, the piston rod is connected to the inner piston; the outer working cylinder includes an outer piston and an outer cylinder body; the inner cylinder body serves as the piston rod of the outer working cylinder and its bottom is connected to the outer piston; hydraulic valves are provided on the inner and outer pistons for connecting the cavities; the double-tube structure is adopted to improve space utilization and effectively expand the range of shock absorption, but it cannot adjust the damping force, based on the viscosity of the oil and the liquid hole on the piston head remain unchanged, so that the shock absorber cannot perform at its best when the vehicle is driving on different roads, and the best shock absorption effect cannot be achieved. Utility Model Content

[0005] The purpose of the utility model is to provide a double-tube double-piston cylinder type hydraulic shock absorber to solve the above-mentioned technical problems, so as to achieve the ability to change the damping force and improve the shock absorption effect.

[0006] In view of this, the utility model provides a double-tube double-piston cylinder type hydraulic shock absorber, comprising:

[0007] External piston cylinder;

[0008] The inner piston cylinder has one end extending into the outer piston cylinder and is provided with a first piston head, and the first piston head is slidably connected to the inner wall of the outer piston cylinder, and a first through hole and a second through hole for connecting the inner piston cylinder and the outer piston cylinder are opened on the first piston head;

[0009] A piston rod, one end of which extends into the inner piston cylinder and is provided with a second piston head, and the second piston head is slidably connected to the inner wall of the inner piston cylinder, and a third through hole is opened on the second piston head;

[0010] An adjusting assembly is installed at one end of the piston rod located at the inner piston cylinder and is used to change the amount of liquid flowing through the third through hole;

[0011] The outer piston cylinder and the inner piston cylinder are both filled with damping fluid, and the faster the piston rod is compressed, the less fluid flows through the third through hole.

[0012] In the above technical solution, further, the adjustment component includes:

[0013] A baffle plate is sleeved on one end of the piston rod located in the inner piston cylinder and is slidably connected to the piston rod;

[0014] The baffle is located at a side of the second piston head away from the piston rod, and a minimum liquid passage is formed between a surface of the baffle away from the axis and an inner wall of the third through hole.

[0015] In the above technical solution, further, the adjustment component also includes:

[0016] The first spring is sleeved on the surface of the piston rod and is located between the first piston head and the baffle.

[0017] In the above technical solution, further:

[0018] A first thread segment and a second thread segment are sequentially arranged at one end of the piston rod close to the second piston head, and the first thread segment axially penetrates the second piston head;

[0019] The diameter of the second thread segment is greater than the diameter of the first thread segment, and the first thread segment is provided with a first nut, and the second thread segment is provided with a second nut.

[0020] In the above technical solution, further:

[0021] A first spiral groove is formed on a side of the first piston head away from the axial direction;

[0022] There are multiple first spiral grooves, which are arranged at equal intervals around the circumference.

[0023] In the above technical solution, further:

[0024] A second spiral groove is formed on a side of the second piston head away from the axial direction;

[0025] There are multiple second spiral grooves, which are arranged at equal intervals around the circumference.

[0026] In the above technical solution, further, it also includes:

[0027] A first connecting end is provided at an end of the piston rod away from the inner piston cylinder;

[0028] The second connecting end is arranged at an end of the outer piston cylinder away from the inner piston cylinder;

[0029] The second spring is sleeved on the surface of the inner piston cylinder, and two ends of the second spring are respectively in contact with the first connecting end and the outer piston cylinder.

[0030] In the above technical solution, further:

[0031] A first annular groove is provided at the sliding connection between the inner piston cylinder and the piston rod, and a first sealing ring is provided in the first annular groove;

[0032] A second annular groove is provided at the sliding connection between the outer piston cylinder and the inner piston cylinder, and a second sealing ring is arranged in the second annular groove.

[0033] The beneficial effects of the utility model are:

[0034] 1. The amount of liquid flowing through the third through hole is adjusted by setting an adjustment component on the piston rod, that is, changing the size of the third through hole. Then, the faster the piston rod is compressed, the less liquid flows through the third through hole. In other words, the more uneven the road surface on which the vehicle travels, the greater the damping force of the shock absorber, which effectively improves the shock absorption effect.

[0035] 2. The amount of fluid flowing through is changed by adopting a baffle. Specifically, when the piston rod is compressed faster, the force exerted by the damping fluid on the baffle is greater, and it will be pushed to partially block the third through hole, thereby reducing the amount of fluid flowing through and increasing the damping force. When the piston rod is compressed slower, the force exerted by the damping fluid on the baffle is smaller, the amount of fluid flowing through is greater or remains unchanged, and the damping force is smaller.

[0036] 3. By opening the first spiral groove on the surface of the second piston head, the damping fluid can enter not only through the third through hole but also from the first spiral groove. When the piston rod is compressed faster, the damping fluid flows faster because the first spiral groove has a curvature, and the damping fluid receives a greater resistance from the curved first spiral groove, which further adjusts and increases the damping force. Conversely, when the piston rod is compressed slower, the damping fluid flows slower, and the damping fluid receives a smaller resistance from the curved first spiral groove, which reduces the damping force. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of the utility model;

[0038] Figure 2 It is a front view of the utility model;

[0039] Figure 3 This utility model Figure 2 Sectional view at AA in the middle;

[0040] Figure 4 This utility model Figure 3 The enlarged view of point B in the middle;

[0041] Figure 5 It is an exploded view of the utility model;

[0042] Figure 6 This utility model Figure 5 Enlarged view of point C in the middle;

[0043] Figure 7 This utility model Figure 5 The enlarged view of point D in the middle;

[0044] The markings in the figure are as follows: 1. outer piston cylinder; 2. inner piston cylinder; 3. first piston head; 4. first through hole; 5. second through hole; 6. piston rod; 7. second piston head; 8. third through hole; 9. adjustment assembly; 90. baffle; 91. minimum liquid passage; 92. first spring; 10. first threaded section; 11. second threaded section; 12. first nut; 13. second nut; 14. first spiral groove; 15. second spiral groove; 16. first connecting end; 17. second connecting end; 18. second spring; 19. first annular groove; 20. first sealing ring; 21. second annular groove; 22. second sealing ring. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0046] Embodiment 1:

[0047] This embodiment provides a double-tube double-piston cylinder type hydraulic shock absorber, comprising:

[0048] Outer piston cylinder 1;

[0049] The inner piston cylinder 2 has one end extending into the outer piston cylinder 1 and is provided with a first piston head 3, and the first piston head 3 is slidably connected to the inner wall of the outer piston cylinder 1, and a first through hole 4 and a second through hole 5 for connecting the inner piston cylinder 2 and the outer piston cylinder 1 are opened on the first piston head 3;

[0050] A piston rod 6, one end of which extends into the inner piston cylinder 2 and is provided with a second piston head 7, and the second piston head 7 is slidably connected to the inner wall of the inner piston cylinder 2, and a third through hole 8 is opened on the second piston head 7;

[0051] An adjusting assembly 9 is installed at one end of the piston rod 6 located at the inner piston cylinder 2 and is used to change the amount of liquid flowing through the third through hole 8;

[0052] The outer piston cylinder 1 and the inner piston cylinder 2 are both filled with damping fluid, and the faster the piston rod 6 is compressed, the less the amount of fluid flowing through the third through hole 8 is;

[0053] Meanwhile, the specific composition of the damping fluid is an existing mature technology, which is not limited in this application and will not be described in detail here;

[0054] Furthermore, both the outer piston cylinder 1 and the inner piston cylinder 2 include a cylinder body and a cylinder head, and a sealing gasket is provided between the cylinder body and the cylinder head, and a threaded connection is adopted. At the same time, the inner piston cylinder 2 is slidably connected to the cylinder head of the outer piston cylinder 1, and the piston rod 6 is slidably connected to the cylinder head of the inner piston cylinder 2.

[0055] It can be seen from the present embodiment that the amount of liquid flowing through the third through hole 8 is adjusted by setting an adjustment component 9 on the piston rod 6, that is, changing the size of the third through hole 8. Then, the faster the piston rod 6 is compressed, the less liquid flows through the third through hole 8. In other words, the more uneven the road surface on which the vehicle travels, the greater the damping force of the shock absorber, thereby effectively improving the shock absorption effect.

[0056] Embodiment 2:

[0057] This embodiment provides a double-tube double-piston cylinder type hydraulic shock absorber, which, in addition to the technical solutions of the above embodiments, also has the following technical features. The adjustment component 9 includes:

[0058] The baffle 90 is sleeved on one end of the piston rod 6 located in the inner piston cylinder 2 and is slidably connected to the piston rod 6;

[0059] The baffle plate 90 is located on a side of the second piston head 7 away from the piston rod 6, and a minimum liquid passage 91 is formed between a surface of the baffle plate 90 away from the axis and an inner wall of the third through hole 8;

[0060] At the same time, a gap is left between the baffle plate 90 and the surface of the piston rod 6 .

[0061] It can be seen from the present embodiment that by adopting the baffle 90, it is convenient to change the size of the third through hole 8 by the damping liquid, thereby changing the amount of liquid flowing. Specifically, when the shock absorber is not subjected to force, the baffle 90 is affected by gravity and moves away from the third through hole 8, and there is also damping liquid between the baffle 90 and the second piston head 7. When the shock absorber is subjected to force, the piston rod 6 will push the second piston head 7 downward. In this process, the damping liquid will push the baffle 90 to move toward the second piston head 7, squeeze out the damping liquid between the baffle 90 and the second piston head 7, and change the size of the third through hole 8 when abutting against the second piston head 7, thereby changing the amount of liquid inflow and the damping force.

[0062] By forming a minimum liquid passage 91 between the surface of the baffle 90 away from the axis and the inner wall of the third through hole 8, the baffle 90 will not block the third through hole 8 when changing the size of the third through hole 8, thereby ensuring the shock absorption effect.

[0063] Embodiment 3:

[0064] This embodiment provides a double-tube double-piston cylinder type hydraulic shock absorber, which, in addition to the technical solutions of the above embodiments, also has the following technical features, and the adjustment component 9 also includes:

[0065] The first spring 92 is sleeved on the surface of the piston rod 6 and is located between the second piston head 7 and the baffle 90;

[0066] The second piston head 7 is provided with an annular groove for embedding one end of the first spring 92 , thereby improving the installation stability of the first spring 92 .

[0067] It can be seen from the present embodiment that, through the setting of the first spring 92, when the baffle 90 changes the excess liquid volume of the third through hole 8, it is necessary to first overcome the force of the first spring 92, so that the shock absorber will not change the excess liquid volume of the third through hole 8 when subjected to a smaller force, thereby improving the shock absorption effect and ensuring the driving comfort of the vehicle.

[0068] Embodiment 4:

[0069] This embodiment provides a double-tube double-piston cylinder type hydraulic shock absorber, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0070] The end of the piston rod 6 close to the second piston head 7 is provided with a first thread segment 10 and a second thread segment 11 in sequence, and the first thread segment 10 axially penetrates the second piston head 7;

[0071] The diameter of the second thread segment 11 is greater than the diameter of the first thread segment 10 , and the first thread segment 10 is provided with a first nut 12 , and the second thread segment 11 is provided with a second nut 13 ;

[0072] At the same time, the piston rod 6 and the first threaded section 10 and the second threaded section 11 are of an integrated structure.

[0073] It can be seen from the present embodiment that, through the first threaded segment 10 and the first nut 12, and the diameter of the second threaded segment 11 being larger than the diameter of the first threaded segment 10, it is convenient to connect the piston rod 6 and the second piston head 7, thereby improving the connection stability, and by adjusting the second nut 13, the elastic potential energy of the first spring 92 can be changed, thereby facilitating the adjustment of the conditions for triggering the damping force adjustment, so that the shock absorber will not change the excess liquid volume of the third through hole 8 when subjected to a small force.

[0074] Embodiment 5:

[0075] This embodiment provides a double-tube double-piston cylinder type hydraulic shock absorber, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0076] A first spiral groove 14 is formed on a side of the first piston head 3 away from the axial direction;

[0077] There are multiple first spiral grooves 14 , which are arranged at equal intervals around the circumference.

[0078] It can be seen from the present embodiment that by providing the first spiral groove 14 on the surface of the first piston head 3, it is convenient to increase the flow rate of the damping fluid passing through the first piston head 3 and increase the damping force when the first piston head 3 is subjected to a large force and produces a large compression. Conversely, the flow rate of the damping fluid passing through the first piston head 3 is reduced and the damping force is reduced. Thus, the damping force can be changed according to the compression speed of the first piston head 3, thereby improving the adaptive effect and ensuring the shock absorption effect.

[0079] Embodiment 6:

[0080] This embodiment provides a double-tube double-piston cylinder type hydraulic shock absorber, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0081] A second spiral groove 15 is formed on a side of the second piston head 7 away from the axial direction;

[0082] There are multiple second spiral grooves 15 , which are arranged at equal intervals around the circumference.

[0083] It can be seen from the present embodiment that by providing the second spiral groove 15 on the surface of the second piston head 7, it is convenient to increase the flow rate of the damping fluid passing through the second piston head 7 and increase the damping force when the second piston head 7 is subjected to a large force and produces a large compression. Conversely, the flow rate of the damping fluid passing through the second piston head 7 is reduced and the damping force is reduced. Thus, the damping force can be changed according to the compression speed of the second piston head 7, thereby improving the adaptive effect and ensuring the shock absorption effect.

[0084] Embodiment 7:

[0085] This embodiment provides a double-tube double-piston cylinder type hydraulic shock absorber, which, in addition to the technical solutions of the above embodiments, also has the following technical features, including:

[0086] A first connecting end 16 is provided at an end of the piston rod 6 away from the inner piston cylinder 2;

[0087] The second connecting end 17 is arranged at an end of the outer piston cylinder 1 away from the inner piston cylinder 2;

[0088] The second spring 18 is sleeved on the surface of the inner piston cylinder 2, and its two ends are respectively in contact with the first connecting end 16 and the outer piston cylinder 1;

[0089] The first connection end 16 is connected to the piston rod 6 by threads, while the second connection end 17 is connected to the outer piston cylinder 1 by welding.

[0090] It can be seen from this embodiment that the first connecting end 16 and the second connecting end 17 facilitate the force of the second spring 18, and the second spring 18 facilitates the shock absorber to reduce the shock of the vehicle, thereby improving the driving comfort of the vehicle.

[0091] Embodiment 8:

[0092] This embodiment provides a double-tube double-piston cylinder type hydraulic shock absorber, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0093] A first annular groove 19 is provided at the sliding connection between the inner piston cylinder 2 and the piston rod 6, and a first sealing ring 20 is provided in the first annular groove 19;

[0094] A second annular groove 21 is provided at the sliding connection between the outer piston cylinder 1 and the inner piston cylinder 2, and a second sealing ring 22 is provided in the second annular groove 21;

[0095] The first sealing ring 20 and the second sealing ring 22 are both made of rubber, and two sets of the first annular groove 19 and the second annular groove 21 can be provided.

[0096] It can be seen from this embodiment that the sealing performance between the piston rod 6 and the inner piston cylinder 2 and between the inner piston cylinder 2 and the outer piston cylinder 1 is improved by forming the first annular groove 19 and the second annular groove 21 and arranging the first sealing ring 20 and the second sealing ring 22 inside.

[0097] The damping force self-adaptation of the shock absorber of the utility model is specifically that when the shock absorber is subjected to a small force, the piston column is compressed with a small and slow stroke. Under the action of the first spring 92, the baffle 90 will not change the amount of liquid flowing through the third through hole 8, and the damping liquid passes through the second through hole 5 and the third through hole 8, and the piston column is displaced, but the damping liquid in the outer piston cylinder 1 increases a small amount, and the inner piston cylinder 2 is displaced a small amount, and the damping force is small this time; when the shock absorber is subjected to an increased force, it increases to push the baffle 90 to overcome the potential energy of the first spring 92 and reduce the flow of liquid through the third through hole 8. The amount of liquid, the amount of compression of the piston column and the compression speed increase, the damping force in the inner piston cylinder 2 increases, and at the same time, the damping liquid flows into the outer piston cylinder 1, and the flow rate increases, the amount of liquid per unit time increases, and the damping force in the outer piston cylinder 1 increases. At this time, the overall damping force of the shock absorber increases, and under the action of the first spiral groove 14 and the second spiral groove 15 on the surface of the first piston head 3 and the second piston head 7, the damping force is further adjusted and increased, so that the shock absorber can perform in the best state when the vehicle is traveling on different roads, and achieve the best shock absorption effect.

[0098] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A double-tube double-piston cylinder type hydraulic shock absorber, characterized in that: include: Outer piston cylinder (1); An inner piston cylinder (2) has one end extending into the outer piston cylinder (1) and is provided with a first piston head (3), and the first piston head (3) is slidably connected to the inner wall of the outer piston cylinder (1), and a first through hole (4) and a second through hole (5) for connecting the inner piston cylinder (2) and the outer piston cylinder (1) are provided on the first piston head (3); A piston rod (6) has one end extending into the inner piston cylinder (2) and is provided with a second piston head (7), and the second piston head (7) is slidably connected to the inner wall of the inner piston cylinder (2), and a third through hole (8) is opened on the second piston head (7); An adjusting assembly (9) is mounted on one end of the piston rod (6) located in the inner piston cylinder (2) and is used to change the amount of liquid flowing through the third through hole (8); The outer piston cylinder (1) and the inner piston cylinder (2) are both filled with damping fluid, and the faster the piston rod (6) is compressed, the less fluid flows through the third through hole (8).

2. The double-tube double-piston cylinder type hydraulic shock absorber according to claim 1, characterized in that: The regulating component (9) comprises: A baffle (90) is sleeved on one end of the piston rod (6) located in the inner piston cylinder (2) and is slidably connected to the piston rod (6); The baffle (90) is located on a side of the second piston head (7) away from the piston rod (6), and a minimum liquid passage (91) is formed between a surface of the baffle (90) away from the axis and an inner wall of the third through hole (8).

3. The double-tube double-piston cylinder type hydraulic shock absorber according to claim 2, characterized in that: The adjustment component (9) further comprises: The first spring (92) is sleeved on the surface of the piston rod (6) and is located between the first piston head (3) and the baffle (90).

4. The double-tube double-piston cylinder type hydraulic shock absorber according to claim 3 is characterized in that: The end of the piston rod (6) close to the second piston head (7) is provided with a first threaded section (10) and a second threaded section (11) in sequence, and the first threaded section (10) axially penetrates the second piston head (7); The diameter of the second thread segment (11) is greater than the diameter of the first thread segment (10), and the first thread segment (10) is provided with a first nut (12), and the second thread segment (11) is provided with a second nut (13).

5. The double-tube double-piston cylinder type hydraulic shock absorber according to claim 1 is characterized in that: A first spiral groove (14) is formed on a side of the first piston head (3) away from the axial direction; Wherein, the first spiral grooves (14) are multiple and are arranged at equal intervals around the circumference.

6. The double-tube double-piston cylinder type hydraulic shock absorber according to claim 1, characterized in that: A second spiral groove (15) is formed on a side of the second piston head (7) away from the axial direction; Wherein, the second spiral grooves (15) are multiple and are arranged at equal intervals around the circumference.

7. The double-tube double-piston cylinder type hydraulic shock absorber according to claim 1, characterized in that: Also includes: A first connecting end (16) is arranged at an end of the piston rod (6) away from the inner piston cylinder (2); A second connecting end (17) is arranged at an end of the outer piston cylinder (1) away from the inner piston cylinder (2); The second spring (18) is sleeved on the surface of the inner piston cylinder (2), and its two ends are respectively in contact with the first connecting end (16) and the outer piston cylinder (1).

8. The double-tube double-piston cylinder type hydraulic shock absorber according to claim 1, characterized in that: A first annular groove (19) is provided at the sliding connection between the inner piston cylinder (2) and the piston rod (6), and a first sealing ring (20) is provided in the first annular groove (19); A second annular groove (21) is provided at the sliding connection between the outer piston cylinder (1) and the inner piston cylinder (2), and a second sealing ring (22) is arranged in the second annular groove (21).

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