Hydraulic buffering and damping suspension oil cylinder

Abstract

The utility model discloses a hydraulic buffering and damping suspension oil cylinder which comprises a cylinder bottom, a cylinder body, a piston rod, a piston, a rod head, a guide sleeve and a rod cavity oil port, an inner hole is formed in the piston rod, and a guide ring is arranged on the piston. An inner hole of the cylinder body is a reducing hole, the diameter of the inner hole of the rear section of the cylinder body is smaller than that of the inner hole of the front section of the cylinder body, and the outer diameter of the rear section of the piston rod is matched with the diameter of the inner hole of the rear section of the cylinder body. A plurality of radial oil ways which are communicated with the outer circle and the inner hole of the piston rod are arranged in the piston rod in front of all the radial oil passing holes, and one-way valves are arranged in the radial oil ways; the damping mechanism has the advantages that damping action response is timely, damping characteristics are linearly distributed, the damping effect is good, and stability and comfort of the mechanism can be improved.

Description

Technical Field

[0001] This utility model relates to a shock-absorbing suspension cylinder, and more particularly to a hydraulic buffer shock-absorbing suspension cylinder. Background Technology

[0002] As heavy-duty trucks and other mechanical vehicles place increasingly higher demands on the stability and comfort of suspension, hydraulic suspension systems are rapidly entering the market. As the hydraulic suspension actuator, the shock-absorbing suspension cylinder realizes the functions of damping and height change in the suspension system.

[0003] A commonly used shock absorber suspension cylinder includes a cylinder bottom, cylinder body, piston rod, piston, guide sleeve, and rod chamber port. A guide ring is installed on the piston, and the piston rod is hollow. A row of radially distributed oil passages is drilled in front of the piston on the rod face, connecting the rod chamber and the rodless chamber. During shock absorption, the piston rod is retracted and pulled out by external force, and the oil is forced out or drawn in from the rodless chamber through the oil passages in front of the piston. Because the oil passage area is small, it plays a certain damping role during shock absorption, but there are problems such as slow response and nonlinear damping, which greatly reduces the stability and comfort. During active lifting and lowering, the oil enters and exits through the rod chamber port and enters and exits the rodless chamber through the oil passages in front of the piston. Because the force-bearing area of ​​the rodless chamber is larger than that of the rod chamber, the piston rod moves to achieve extension and retraction. Summary of the Invention

[0004] The purpose of this utility model is to address the above-mentioned shortcomings of the existing technology by providing a hydraulic buffer and shock-absorbing suspension cylinder, which has the characteristics of timely shock absorption response and linear distribution of damping characteristics, resulting in good shock absorption effect and improved stability and comfort of the mechanism.

[0005] To achieve the above objectives, this utility model provides a hydraulic buffer and shock-absorbing suspension cylinder, comprising a cylinder bottom, a cylinder body, a piston rod, a piston, a rod head, a guide sleeve, and a rod-shaped oil port. The piston rod has an inner hole, and a guide ring is provided on the piston. The cylinder body's inner hole is a variable-diameter hole, with the diameter of the rear section of the cylinder body's inner hole being smaller than that of its front section. The outer diameter of the rear section of the piston rod matches the diameter of the rear section of the cylinder body's inner hole. Several rows of radial oil passages connecting the outer circle and the inner hole are provided in the rear section of the piston rod in front of the piston. Several radial oil passages connecting the outer circle and the inner hole are provided in the piston rod in front of all the radial oil passages, and each radial oil passage is equipped with a one-way valve.

[0006] The cylinder of this invention has a free stroke section at the front with a larger inner diameter and a buffer stroke section at the rear with a smaller inner diameter. Several rows of radial oil passages connect the rod chamber and rodless chamber on the front and rear sides of the piston. Throughout the retraction process under external force, the one-way valve is closed, and the number of radial oil passages exposed on the piston rod in the free stroke section gradually decreases. In the front section, the damping response is timely, the damping phenomenon gradually increases, and the damping characteristics are linearly distributed, resulting in good damping effect and improving the stability and comfort of the mechanism. During the extension action, the one-way valve opens, oil enters the rodless chamber, and as the piston rod extends, more radial oil passages enter the free stroke section, and oil can also enter the rodless chamber from the oil passages, enabling the piston rod to extend rapidly and respond promptly.

[0007] As a further improvement of this utility model, each radial oil passage hole is provided with an annular groove at its radial outer end; when the piston rod is vibrating, the oil forms an oil ring in the annular groove, which can increase the lubrication effect and support and guide function.

[0008] As a further improvement of this utility model, the plurality of radial oil passages are all axially located at the junction of the rear section inner hole and the front section inner hole of the cylinder when the piston rod is fully retracted; this can improve the timeliness and effective stroke of the piston rod extension.

[0009] As a further improvement of this utility model, a sealing ring is provided on the piston to prevent oil leakage between the rod chamber and the rodless chamber.

[0010] In summary, this utility model features timely vibration reduction response and linear damping characteristics, resulting in good vibration reduction effect and improved stability and comfort of the mechanism. Attached Figure Description

[0011] Figure 1 This is a front view of an embodiment of the present utility model.

[0012] Figure 2 This is a front view of the piston rod portion in retracted or extended according to an embodiment of the present invention. Detailed Implementation

[0013] The present invention will now be described in further detail with reference to the accompanying drawings.

[0014] like Figure 1 , Figure 2As shown, this embodiment of a hydraulic buffer shock absorber suspension cylinder includes a cylinder bottom 1, a cylinder body 2, a piston rod 3, a piston 4, a rod head 5, a guide sleeve 6, and a rod chamber port 7. The piston rod 3 has an inner hole 8, and the piston 4 is provided with a guide ring 9 and a sealing ring 10. The inner hole of the cylinder body 1 is a variable diameter hole, and the diameter of the rear section inner hole 11 of the cylinder body 1 is smaller than the diameter of its front section inner hole 12. The outer diameter of the rear section of the piston rod 3 matches the diameter of the rear section inner hole 11 of the cylinder body (the gap between the two is less than 1 mm). A connecting rod is provided in the rear section of the piston rod in front of the piston 4. A number of radial oil passages 13 are arranged at equal intervals in the axial direction, and an annular groove 14 is provided at the radial outer end of each radial oil passage 13. Several radial oil passages connecting the outer circle and the inner hole are provided in the piston rod 3 in front of all the radial oil passages 13. A one-way valve 16 is provided in each radial oil passage. The valve core of the one-way valve 16 is located on the radial outer side of its return spring. Several radial oil passages 15 are axially corresponding to the junction of the rear section inner hole 11 and the front section inner hole 12 of the cylinder when the piston rod 3 is fully retracted.

[0015] In this invention, the cylinder body 2 has a larger inner diameter front section as the free stroke section and a smaller inner diameter rear section as the buffer stroke section. Several rows of radial oil passage holes 13 connect the rod chamber and rodless chamber on the front and rear sides of the piston. During the shock absorption and retraction action, oil is forced from the rodless chamber into the rod chamber through the radial oil passage holes 13 in front of the piston 4. At this time, the one-way valve 16 inside the piston rod is closed, and oil cannot pass through.

[0016] like Figure 2 As shown, in the initial stage of the retraction action, there are many radial oil passage holes 13 on the piston rod 3 exposed in the free stroke section of the cylinder 2, which can allow a large amount of oil to pass through. At this time, the damping phenomenon is weak, which can achieve rapid retraction and timely response.

[0017] During the middle of the retraction action, a portion of the radial oil passage holes 13 enter the buffer stroke section at the rear of the cylinder 2. Since the gap between the piston rod 3 and the buffer stroke section of the cylinder 2 is small, the oil passage area is small. The number of radial oil passage holes exposed on the piston rod 3 in the free stroke section at the front of the cylinder 2 is reduced, and the amount of oil that can pass through is reduced. At this time, the damping phenomenon is enhanced, and medium-speed retraction can be achieved.

[0018] In the later stage of the retraction action, as the buffer stroke gradually increases, more radial oil holes 13 enter the cylinder buffer stroke section, and the number of radial oil holes exposed on the piston rod 3 in the cylinder free stroke section gradually returns to zero. As a result, the damping phenomenon gradually increases and the retraction becomes slower and slower.

[0019] During the entire process of retraction under external force, the number of radial oil passages exposed in the free stroke of the piston rod 3 gradually decreases, the damping phenomenon gradually increases, the damping characteristics are linearly distributed, the shock absorption effect is good, and the stability and comfort of the mechanism can be improved.

[0020] When the shock absorber extends, the one-way valve 16 opens, allowing oil to pass through. The oil enters the rodless chamber through the one-way valve 16. As the piston rod 3 extends, the number of radial oil passages 13 entering the free stroke section of the cylinder increases, and the oil can also enter the rodless chamber through the radial oil passages 13, enabling the piston rod to extend rapidly.

[0021] During the active extension action, the oil enters the rod chamber through the oil port 7 of the rod chamber, and then enters the rodless chamber through the radial oil passage 13 in front of the piston and the one-way valve 16. Since the force-bearing area of ​​the rodless chamber is larger than that of the rod chamber, the piston rod 3 extends.

[0022] When the piston rod 3 is vibrating, the oil forms an oil ring in the annular groove 14, which can increase the lubrication effect and provide support and guidance.

[0023] Several radial oil passages are located axially at the junction of the rear and front inner bores of the cylinder 2 when the piston rod 3 is fully retracted, which can improve the timeliness and effective stroke of the piston rod extension; the sealing ring 10 can prevent oil leakage between the rod chamber and the rodless chamber.

Claims

1. A hydraulic damping suspension cylinder, comprising a cylinder bottom, a cylinder body, a piston rod, a piston, a rod head, a guide sleeve, and a rod-side port; the piston rod has an inner hole, and a guide ring is provided on the piston; characterized in that... The cylinder body has a variable diameter bore, with the diameter of the rear section of the cylinder body being smaller than that of the front section. The outer diameter of the rear section of the piston rod matches the diameter of the rear section of the cylinder body. Several rows of radial oil passages are provided in the rear section of the piston rod in front of the piston, connecting its outer circle and inner hole. Several radial oil passages are provided in the piston rod in front of all the radial oil passages, connecting its outer circle and inner hole. Each radial oil passage is equipped with a check valve.

2. The hydraulic buffer and shock-absorbing suspension cylinder according to claim 1, characterized in that: Each radial oil passage hole has an annular groove at its radial outer end.

3. A hydraulic buffer and shock-absorbing suspension cylinder according to claim 1 or 2, characterized in that: The radial oil passages all correspond axially to the junction of the rear and front sections of the cylinder bore when the piston rod is fully retracted.

4. A hydraulic buffer and shock-absorbing suspension cylinder according to claim 3, characterized in that: A sealing ring is provided on the piston.

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