A hydraulic shock absorber with good damping effect and its hydraulic damping system

Abstract

The present invention relates to a hydraulic shock absorber with good damping effect and a hydraulic damping system thereof, wherein the hydraulic damping system comprises: an oil-passing portion sleeved on a piston rod, and the oil-passing portion is fixed in the inner wall of the lower end of a handle tube; wherein when the handle tube is pressed downward, the hydraulic oil can be squeezed into a spring buffer chamber through the oil-passing portion; when the handle tube is lifted upward, the hydraulic oil can flow back to the hydraulic storage chamber. In this hydraulic damping system, when the handle tube is pressed downward, the hydraulic oil can be squeezed into the spring buffer chamber through the oil-passing portion; when the handle tube is lifted upward, the hydraulic oil can flow back to the hydraulic storage chamber. This not only lubricates the spring located in the spring buffer chamber, but also further provides a damping effect, thereby strengthening the damping effect of the shock-absorbing spring.

Description

Technical Field

[0001] The invention relates to vehicle parts, in particular to a hydraulic shock absorber with good damping effect and a hydraulic damping system thereof. Background Art

[0002] Patent No. CN2015203581976 discloses a straight cylinder hydraulic rear shock absorber, which is suitable for electric vehicles and includes a bottom cylinder, a fork tube, a positioning rod, a one-way throttle valve and a shock absorbing spring, wherein the bottom cylinder is filled with hydraulic oil, a one-way throttle valve is arranged at one end of the fork tube and inserted into the bottom cylinder, the positioning rod is a hollow structure with an oil hole opened thereon, and one end of the positioning rod is fixed to the bottom cylinder, and a piston is arranged at the other end and inserted into the fork tube, the shock absorbing spring includes a main spring and an extrusion spring, the main spring is arranged in the fork tube on one side of the piston, the extrusion spring is arranged in the fork tube on the other side of the piston, and a sealing assembly is arranged at the junction of the fork tube and the bottom cylinder. Compared with the existing rear shock absorber with an external spring structure, the straight cylinder hydraulic rear shock absorber has the advantages of stable structure, good strength and good shock absorbing effect.

[0003] Among them, this straight-tube hydraulic rear shock absorber has the following disadvantages:

[0004] 1. The oil circuit is circulated in the positioning tube. During the extrusion process, the hydraulic oil is instantly squeezed into the positioning tube. The hydraulic oil cannot achieve a good lubrication effect on the main spring extrusion spring;

[0005] 2. During the shock absorption process of the fork tube, the bottom end of the fork tube is prone to touch the bottom and cause damage. Summary of the invention

[0006] The technical problem to be solved by the present invention is to solve one of the problems in the background technology.

[0007] The technical solution adopted by the present invention to solve its technical problem is:

[0008] A hydraulic damping system comprises: an oil passage portion sleeved on a piston rod, and

[0009] The oil passage is fixed in the inner wall of the lower end of the handle tube;

[0010] When the handle tube is pressed downward, the hydraulic oil can be squeezed into the spring buffer chamber through the oil passage;

[0011] When the handle tube is lifted, the hydraulic oil can flow back to the hydraulic storage chamber.

[0012] Preferably, the oil passage portion comprises a shielding portion and a switching piece which are sequentially sleeved on the piston rod from top to bottom;

[0013] The on-off piece is provided with a plurality of oil passages along the sliding direction of the handle tube;

[0014] The shielding part is covered on the on-off piece to block the oil passage; wherein

[0015] When the handle tube is pressed downward, the hydraulic oil can pass through the oil passage and squeeze through the shielding portion.

[0016] Preferably, a first flow channel is provided on the switch member along the sliding direction of the handle tube;

[0017] The shielding portion is provided with a second flow channel connected to the first flow channel along the sliding direction of the handle tube;

[0018] When the handle tube is lifted, the hydraulic oil can flow back to the hydraulic storage chamber through the second flow channel and the first flow channel in sequence.

[0019] Preferably, a second flow channel communicating with the oil passage is provided on the shielding portion along the sliding direction of the handle tube;

[0020] The piston rod is provided with an oil return hole, an oil injection hole and a return flow passage connecting the oil return hole and the oil injection hole; and

[0021] The oil passage is located on the piston rod between the oil return hole and the oil injection hole; wherein

[0022] When the handle tube is lifted, the hydraulic oil can flow back from the oil return hole of the spring buffer chamber to the hydraulic storage chamber at the oil filling hole.

[0023] Preferably, the shielding portion comprises a first gasket, a spring sheet and a second gasket which are sleeved on the piston rod from top to bottom;

[0024] The second flow channel includes a first channel opened on the first gasket and a second channel opened on the second gasket; wherein

[0025] When the handle tube is pressed downward, the hydraulic oil can sequentially pass through the oil passage, the second passage, and the first passage and reach the spring buffer chamber.

[0026] Preferably, the end of the piston rod has a piston head;

[0027] When the handle tube is pressed down, the hydraulic oil can pass through the piston head from the spring buffer chamber to the spring placement chamber;

[0028] When the handle tube is lifted, the hydraulic oil can pass through the piston head from the spring placement chamber to the spring buffer chamber.

[0029] Preferably, the piston rod is provided with an oil filling hole, an open top end, a connecting passage connecting the oil filling hole and the open top end, and the open top end is located in the spring placement cavity;

[0030] The piston head comprises a positioning ring which is interference-fitted with the inner wall of the handle tube and a sleeve ring which is sleeved on the end of the piston rod; and

[0031] An annular notch is formed on the outer ring of the sleeve, and a third channel is formed on the bottom end surface of the annular notch along the sliding direction of the handle tube;

[0032] The positioning ring is clamped in the annular notch, the bottom end surface of the positioning ring is offset from the inlet end surface of the third channel, and the height of the positioning ring is smaller than the height of the annular notch.

[0033] Preferably, the piston head comprises a positioning ring which is interference-fitted with the inner wall of the handle tube and a sleeve ring which is sleeved on the end of the piston rod; and

[0034] An annular notch is formed on the outer ring of the sleeve, a third channel is formed on the bottom end surface of the annular notch along the sliding direction of the handle tube, a fourth channel is formed on the top end surface of the annular notch along the sliding direction of the handle tube, and the fourth channel is connected to the third channel;

[0035] The positioning ring is clamped in the annular gap, the bottom end face of the positioning ring is offset with the inlet end face of the third channel, the top end face of the positioning ring is offset with the inlet end face of the fourth channel, and the height of the positioning ring is smaller than the height of the annular gap.

[0036] The beneficial effects of the present invention are:

[0037] This hydraulic damping system, through the oil passage, when the handle tube is pressed down, the hydraulic oil can be squeezed into the spring buffer chamber through the oil passage; when the handle tube is lifted up, the hydraulic oil can flow back to the hydraulic storage chamber. It not only lubricates the springs in the spring buffer chamber and the spring placement chamber, but also further provides a damping effect, thereby strengthening the damping effect of the shock absorbing spring.

[0038] The invention also provides a hydraulic shock absorber with good damping effect.

[0039] A hydraulic shock absorber with good damping effect comprises a handle tube and an outer sleeve which can be relatively slidably arranged, a piston rod fixed to the bottom of the inner cavity of the outer sleeve, and the piston rod has the hydraulic damping system as described above.

[0040] A buffer is fixed on the piston rod at the bottom of the outer sleeve, wherein

[0041] When the handle tube is pressed downward, the oil passage is blocked by the buffer component so that the hydraulic oil is blocked.

[0042] The beneficial effects of the present invention are:

[0043] This hydraulic shock absorber with good damping effect, through the adoption of a hydraulic damping system, lubricates the damping spring located in the spring buffer chamber and the extrusion spring in the spring placement chamber, and further provides a damping effect, thereby strengthening the damping action of the shock absorber; through the adoption of a buffer component, when the handle tube hits the bottom when sliding down, the buffer component will block the oil passage to block the flow of hydraulic oil, thereby achieving good protection of the handle tube from hitting the bottom. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0045] Figure 1 1 is a schematic structural diagram of a hydraulic shock absorber with good damping effect according to the first embodiment of the present invention;

[0046] Figure 2 1 is a schematic diagram of the piston rod structure of the first embodiment of the present invention;

[0047] Figure 3 2 is a schematic structural diagram of a hydraulic shock absorber with good damping effect according to a third embodiment of the present invention;

[0048] Figure 4 1 is a schematic structural diagram of an oil passage portion according to a first embodiment of the present invention;

[0049] Figure 5 is a schematic structural diagram of a piston head according to a second embodiment of the present invention;

[0050] Figure 6 Schematic diagram of the structure of the oil passage portion of the third embodiment of the present invention;

[0051] Figure 7 is a schematic structural diagram of a piston head according to a fourth embodiment of the present invention;

[0052] Figure 8 It is a schematic diagram of the flow path of hydraulic oil at the oil passage portion when the handle tube is pressed down in the first embodiment of the present invention;

[0053] Fig. 9 Schematic diagram of the flow path of hydraulic oil at the piston head when the handle tube is pressed down in the second embodiment of the present invention;

[0054] Fig.10 It is a schematic diagram of the flow path of the hydraulic oil at the piston rod when the handle tube is pressed down in the first embodiment of the present invention;

[0055] Fig.11Schematic diagram of the flow path of hydraulic oil at the piston rod when the handle tube is reset in the first embodiment of the present invention;

[0056] Fig.12 Schematic diagram of the flow path of hydraulic oil at the oil passage portion when the handle pipe of the third embodiment of the present invention is pressed down;

[0057] Fig.13 Schematic diagram of the flow path of hydraulic oil at the piston head when the handle of the fourth embodiment of the present invention is pressed down;

[0058] Fig.14 Schematic diagram of the flow path of hydraulic oil at the oil passage portion when the handle pipe of the third embodiment of the present invention is reset;

[0059] Fig.15 Schematic diagram of the flow path of hydraulic oil at the piston head when the handle tube is reset in the fourth embodiment of the present invention;

[0060] In the figure:

[0061] Outer sleeve 1, handle tube 2;

[0062] Piston rod 3, oil return hole 301, oil injection hole 302, return channel 303, top opening 304, connecting channel 305;

[0063] Hydraulic storage chamber 4, spring buffer chamber 5, spring placement chamber 6, damping spring 7, extrusion spring 8;

[0064] Oil passage 9, on-off member 901, first gasket 902, spring sheet 903, second gasket 904, oil passage 905, second passage 906, first passage 907, first flow passage 908, annular groove 909, annular opening 910;

[0065] Buffer 10;

[0066] Piston head 11 , positioning ring 1101 , sleeve ring 1102 , annular notch 1103 , third channel 1104 , fourth channel 1105 . DETAILED DESCRIPTION

[0067] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0068] Set-in: Set-in means to fix in place, which is a specific form of fixed connection.

[0069] Several: In this article, several means greater than or equal to 1.

[0070] Embodiment 1

[0071] like Figure 1 , 2As shown in Figure 4, a hydraulic damping system includes: an oil-passing portion 9 sleeved on the piston rod 3, and the oil-passing portion 9 is fixed in the inner wall of the lower end of the handle tube 2; when the handle tube 2 is pressed downward, the hydraulic oil can be squeezed into the spring buffer chamber 5 through the oil-passing portion 9; when the handle tube 2 is lifted, the hydraulic oil can flow back to the hydraulic storage chamber 4.

[0072] An annular cavity is provided at the lower end of the inner wall of the handle tube 2, and the annular cavity is mainly used to accommodate the oil passage portion 9. During installation, the lower flange has not been folded. After the oil passage portion 9 is placed in the handle tube 2, the locking and positioning effect is achieved by folding the lower flange.

[0073] This hydraulic damping system, through the oil passage 9, when the handle tube 2 is pressed down, the hydraulic oil can be squeezed into the spring buffer chamber 5 through the oil passage 9; when the handle tube 2 is lifted up, the hydraulic oil can flow back to the hydraulic storage chamber 4. This not only lubricates the spring in the spring buffer chamber 5, but also further provides a damping effect, thereby strengthening the damping effect of the shock absorbing spring.

[0074] In this embodiment, the oil passage 9 includes a shielding portion and a switch 901 which are sequentially sleeved on the piston rod 3 from top to bottom; a plurality of oil passages 905 are provided on the switch 901 along the sliding direction of the handle tube 2; the shielding portion is covered on the switch 901 to block the oil passages 905. Here, from top to bottom means that the downward pressing direction of the handle tube 2 is downward, and the upward lifting direction is upward. It should be pointed out that the switch 901 can be a powder metallurgy part or a plastic part. The oil passage 905 is provided on the switch 901 from its upper surface to its lower surface, wherein the number of the oil passages 905 is at least one, and there is no specific restriction on the distribution form thereof.

[0075] When the handle tube 2 is pressed downward, the hydraulic oil can pass through the oil passage 905 and squeeze through the shielding portion.

[0076] Preferably, the shielding portion includes a first gasket 902, a spring sheet 903 and a second gasket 904 which are sleeved on the piston rod 3 from top to bottom; the second flow channel includes a first channel 907 opened on the first gasket 902 and a second channel 906 opened on the second gasket 904; wherein

[0077] When the handle tube 2 is pressed downward, the hydraulic oil can sequentially pass through the oil passage 905 , the second passage 906 , and the first passage 907 to reach the spring buffer chamber 5 .

[0078] In this embodiment, the first gasket 902 is an iron gasket; the second gasket 904 is a thin spring flat gasket, in which a spring sheet 903 is sandwiched, which plays a buffering and sealing effect. When the handle tube 2 is pressed down, the hydraulic oil will cause an impact on the second gasket 904. During the impact, the spring sheet 903 will be compressed, causing the impact force suffered by the second gasket 904 to change from the front side to the inclined side, thereby causing the second gasket 904 to tilt, thereby realizing the circulation of hydraulic oil.

[0079] In order to achieve a generally good limiting effect, a specific structure of a switch 901 is provided in this embodiment: the switch 901 is annular, and an annular opening 910 is provided at the upper end of its inner ring wall, and the above-mentioned second gasket 904 and spring sheet 903 are placed in the annular opening 910, and the first gasket 902 completely rests against the top end surface of the switch 901, and the switch 901 and the first gasket 902 are clamped together in the annular cavity of the handle tube 2.

[0080] Working process:

[0081] like Figure 4 , 8 As shown in 10, when the handle tube 2 is pressed down, because the handle tube 2 and the oil passage 9 are relatively stationary and fixed to each other, the handle tube 2 will cooperate to drive the oil passage 9 to be pressed down. During the pressing process, the hydraulic oil will be divided into two branches, one of which is that the hydraulic oil will be injected into the spring buffer chamber 5 along the oil injection hole 302, the return channel 303 and the return oil hole 301 on the piston rod 3, and the other branch is that the hydraulic oil enters along the oil passage 905 in sequence. At the same time, the hydraulic oil will impact the second gasket 904. During the impact, the spring sheet 903 will be pressed, so that the impact force suffered by the second gasket 904 will change from the front to the inclined surface, thereby causing the second gasket 904 to tilt, thereby realizing the circulation of the hydraulic oil, that is, from the oil passage 905 to the second channel 906 of the second gasket 904, and finally to the first channel 907 of the first gasket 902, so that the hydraulic oil is in contact with the damping spring 7 in the spring buffer chamber 5, achieving the effect of lubrication and enhanced damping;

[0082] like Fig.11As shown, when the handle tube 2 is reset, part of the hydraulic oil is located in the spring buffer chamber 5 and needs to be reset. During the reset process, because the impact force of the hydraulic oil on the second gasket 904 has disappeared, the spring sheet 903 will be reset, thereby resetting the second gasket 904. The second gasket 904 will cover the oil passage 905, thereby preventing the circulation of hydraulic oil. Under the action of the oil return hole 301 on the piston rod 3, this part of the hydraulic oil passes through the return passage 303 and the oil filling hole 302 in sequence and flows back to the hydraulic storage chamber 4 (a small amount flows into the spring placement chamber 6). This reciprocating motion not only plays a role in shock absorption and damping, but also has a good lubrication effect on the damping spring 7.

[0083] Embodiment 2: Embodiment 2 is carried out on the basis of Embodiment 1, but Embodiment 2 can also be implemented independently or in combination with Embodiment 1.

[0084] like Figure 1 , 2 As shown in Figure 5, in this embodiment, the end of the piston rod 3 has a piston head 11; when the handle tube 2 is pressed down, the hydraulic oil can pass through the piston head 11 from the spring buffer chamber 5 to the spring placement chamber 6; when the handle tube 2 is lifted up, the hydraulic oil can pass through the piston head 11 and the oil return hole 301 from the spring placement chamber 6, and when the handle tube 2 is pressed down for the second time, the hydraulic oil will return again. The piston head 11 is provided here, and the existence of the piston head 11 divides the original spring buffer chamber 5 into two parts, the lower part is the spring buffer chamber 5 for storing the damping spring 7, and the upper part forms the spring buffer chamber 5 for placing the extrusion spring 8. In the first embodiment, the lubrication of the damping spring 7 has been realized, and the second embodiment is used to realize the lubrication of the extrusion spring 8.

[0085] The piston rod 3 is provided with an oil filling hole 302, a top opening 304, and a connecting passage 305 connecting the oil filling hole 302 and the top opening 304. The top opening 304 referred to here means that the piston rod 3 is a tubular piston rod 3 with a through top, and the top opening 304 is connected with the oil filling hole 302 and the oil return hole 301. The top opening 304 is located in the spring placement chamber 6, and the top opening 304 and the spring placement chamber 6 are connected with each other.

[0086] The piston head 11 includes a positioning ring 1101 which is interference-fitted with the inner wall of the handle tube 2 and a sleeve ring 1102 which is sleeved on the end of the piston rod 3; and

[0087] The outer ring of the sleeve 1102 is provided with an annular notch 1103, and the bottom end surface of the annular notch 1103 is provided with a third channel 1104 arranged along the sliding direction of the handle tube 2;

[0088] The positioning ring 1101 is clamped in the annular notch 1103, and the bottom end face of the positioning ring 1101 is offset from the inlet end face of the third channel 1104. The offset setting of the bottom end face of the positioning ring 1101 and the inlet end face of the third channel 1104 here means that when the handle tube 2 is pressed down, because the positioning ring 1101 and the inner wall of the handle tube 2 are interference fit, the two are relatively fixed, that is, the handle tube 2 will drive the positioning ring 1101 to be pressed down, so that the bottom end face of the positioning ring 1101 is fitted with the bottom end face of the annular notch 1103 (which is also the inlet end face of the third channel 1104). At this time, the inlet of the third channel 1104 is not covered by the bottom end face of the positioning ring 1101, and can be partially covered, but not completely covered. The preferred solution is to not cover it at all.

[0089] The height of the positioning ring 1101 is smaller than the height of the annular notch 1103 . The technical effect of the technical feature here is to facilitate the relative displacement of the positioning ring 1101 relative to the annular notch 1103 along the sliding direction of the handle tube 2 .

[0090] Working process:

[0091] like Figure 5 , 9 As shown in Figure 10, after the hydraulic oil flows into the spring buffer chamber 5 with the damping spring 7, as the handle tube 2 continues to be pressed downward, part of the hydraulic oil will flow into the third channel 1104 on the piston head 11, and then flow into the annular gap 1103; at this time, because the positioning ring 1101 and the inner wall of the handle tube 2 are interference fit, the two are relatively fixed, that is, the handle tube 2 will drive the positioning ring 1101 to be pressed downward, so that the bottom end face of the positioning ring 1101 and the bottom end face of the annular gap 1103 (which is also the inlet end face of the third channel 1104) fit together, and at the same time, there is a gap between the top end face of the positioning ring 1101 and the top end face of the annular gap 1103, and there is also a gap between the outer wall of the piston head 11 and the inner wall of the handle tube 2, so that the hydraulic oil in the annular gap 1103 will enter the spring placement chamber 6 through the two gaps, thereby achieving a lubrication effect on the extrusion spring 8.

[0092] Simultaneously, a stream of hydraulic oil will be injected into the spring buffer chamber 5 along the oil filling hole 302, the return channel 303 and the return oil hole 301 on the piston rod 3, and part of it will be directly pushed to the top opening 304 and enter the spring placement chamber 6, thereby achieving the lubrication effect of the extrusion spring 8.

[0093] like Fig.11As shown, when the handle tube 2 is reset, the positioning ring 1101 and the inner wall of the handle tube 2 are interference fit, so the two are relatively fixed, that is, the handle tube 2 will drive the positioning ring 1101 to lift up, so that the top surface of the positioning ring 1101 fits with the top surface of the annular notch 1103, thereby blocking the gap between the top surface of the positioning ring 1101 and the top surface of the annular notch 1103. At this time, in order to achieve the reset of the hydraulic oil, it can only be discharged from the oil filling hole 302 through the top opening and the connecting channel 305. (It should be pointed out that in order to simplify the overall structure, the connecting channel 305 and the return channel 303 are interconnected and are the same)

[0094] Embodiment 3

[0095] The difference between the third embodiment and the first embodiment is that the piston rod 3 is a solid rod without a return channel 303 or a connecting channel 305 inside.

[0096] like Figure 3 and 6 As shown,

[0097] The on-off member 901 is provided with a first flow channel 908 along the sliding direction of the handle tube 2; the shielding portion is provided with a second flow channel connected to the first flow channel 908 along the sliding direction of the handle tube 2;

[0098] Among them, the first flow channel 908 is opened in the inner ring of the oil passage 905. According to different needs, the first flow channel 908 can also be opened in the outer ring of the oil passage 905. During the downward pressing of the handle tube 2, the oil passage 905 and the first flow channel 908 can synchronously achieve the effect of oil intake. During the resetting of the handle tube 2, the oil passage 905 is completely covered and shielded and cannot be circulated. Therefore, the circulation is achieved by means of the connection between the second flow channel and the first flow channel 908.

[0099] When the handle tube 2 is lifted, the hydraulic oil can flow back to the hydraulic storage chamber 4 through the second flow channel and the first flow channel 908 in sequence.

[0100] The shielding portion includes a first gasket 902, a spring sheet 903 and a second gasket 904 which are sleeved on the piston rod 3 from top to bottom; the second flow channel includes a first channel 907 opened on the first gasket 902 and a second channel 906 opened on the second gasket 904; wherein

[0101] When the handle tube 2 is pressed downward, the hydraulic oil can sequentially pass through the oil passage 905 , the second passage 906 , and the first passage 907 to reach the spring buffer chamber 5 .

[0102] It has been pointed out in the embodiment that when the handle tube 2 is reset, the hydraulic oil needs to be reset. At this time, part of the hydraulic oil is in the spring buffer chamber 5 and needs to be reset. During the reset process, because the hydraulic oil impact force on the second gasket 904 has disappeared, the spring sheet 903 will be reset, thereby resetting the second gasket 904. The second gasket 904 will cover the oil passage 905, thereby preventing the hydraulic oil from flowing.

[0103] In order to solve this technical problem, the embodiment adopts a hollow piston rod 3 to achieve circulation, while the third embodiment is to open a first flow channel 908 on the on-off piece 901 along the sliding direction of the handle tube 2.

[0104] The switch 901 is also annular, and an annular groove 909 is provided at the upper end of the inner ring thereof. A first flow channel 908 is provided on the bottom end surface of the annular groove 909 , and a second flow channel is communicated with the annular groove 909 .

[0105] An oil passage 905 is provided on the original top surface of the on-off piece 901 . Therefore, even if the oil passage 905 is covered, the hydraulic oil can be discharged through the second flow passage because the second flow passage is in communication with the annular groove 909 .

[0106] Working process:

[0107] like Figure 3 , 6 As shown in 11, when the handle tube 2 is pressed down, because the handle tube 2 and the oil passage 9 are relatively stationary and fixed to each other, the handle tube 2 will cooperate to drive the oil passage 9 to be pressed down. During the pressing process, the hydraulic oil will be divided into two branches, one of which: the hydraulic oil will be injected into the spring buffer chamber 5 along the first flow channel 908 and the second flow channel, and the other branch: the hydraulic oil will enter along the oil passage 905 in sequence, and the hydraulic oil will impact the second gasket 904 at the same time. During the impact process, the spring sheet 903 will be pressed, so that the impact force suffered by the second gasket 904 will be changed from the front to the inclined surface, thereby causing the second gasket 904 to tilt, thereby realizing the circulation of the hydraulic oil, that is, from the oil passage 905 to the second channel 906 of the second gasket 904, and finally to the first channel 907 of the first gasket 902, so that the hydraulic oil can contact with the damping spring 7 in the spring buffer chamber 5, and achieve the effect of lubrication and enhanced damping;

[0108] like Fig.14As shown, when the handle tube 2 is reset, the hydraulic oil needs to be reset. At this time, part of the hydraulic oil is in the spring buffer chamber 5 and needs to be reset. During the reset process, because the hydraulic oil impact force on the second gasket 904 has disappeared, the spring sheet 903 will be reset, so that the second gasket 904 is reset, and the second gasket 904 will cover the oil passage 905, so that the hydraulic oil cannot flow; and this part of the hydraulic oil will flow back to the hydraulic storage chamber 4 through the first channel 907, the second channel 906 and the first flow channel 908. In this reciprocating manner, while playing a role in shock absorption and damping, the damping spring 7 has a good lubrication effect.

[0109] Embodiment 4

[0110] Embodiment 4 is carried out on the basis of embodiment 3.

[0111] like Figure 3 and 7 As shown,

[0112] The piston head 11 includes a positioning ring 1101 which is interference-fitted with the inner wall of the handle tube 2 and a sleeve ring 1102 which is sleeved on the end of the piston rod 3; and

[0113] An annular notch 1103 is formed on the outer ring of the sleeve 1102, a third channel 1104 is formed on the bottom end surface of the annular notch 1103 and is arranged along the sliding direction of the handle tube 2, a fourth channel 1105 is formed on the top end surface of the annular notch 1103 and is arranged along the sliding direction of the handle tube 2, and the fourth channel 1105 and the third channel 1104 are connected to each other;

[0114] The positioning ring 1101 is clamped in the sleeve ring 1102, the bottom end face of the positioning ring 1101 is offset with the inlet end face of the third channel 1104, the top end face of the positioning ring 1101 is offset with the inlet end face of the fourth channel 1105, and the height of the positioning ring 1101 is smaller than the height of the sleeve ring 1102.

[0115] Working process:

[0116] like Figure 3 , 7As shown in Figure 13, after the hydraulic oil flows into the spring buffer chamber 5 with the damping spring 7, as the handle tube 2 continues to be pressed downward, part of the hydraulic oil will flow into the third channel 1104 on the piston head 11, and then flow into the annular gap 1103; at this time, because the positioning ring 1101 and the inner wall of the handle tube 2 are interference fit, the two are relatively fixed, that is, the handle tube 2 will drive the positioning ring 1101 to be pressed downward, so that the bottom end face of the positioning ring 1101 and the bottom end face of the annular gap 1103 (which is also the inlet end face of the third channel 1104) are in contact, and at the same time, there is a gap between the top end face of the positioning ring 1101 and the top end face of the annular gap 1103, and there is also a gap between the outer wall of the piston head 11 and the inner wall of the handle tube 2, so that the hydraulic oil in the annular gap 1103 will enter the spring placement chamber 6 through the two gaps, thereby achieving a lubrication effect on the extrusion spring 8.

[0117] Simultaneously, a stream of hydraulic oil will be directly injected into the spring placement chamber 6 along the third channel 1104 and the fourth channel 1105 to achieve the lubrication effect of the extrusion spring 8.

[0118] like Fig.15 As shown, when the handle tube 2 is reset, the positioning ring 1101 and the inner wall of the handle tube 2 are interference fit, so the two are relatively fixed, that is, the handle tube 2 will drive the positioning ring 1101 to lift up, so that the top end surface of the positioning ring 1101 fits with the top end surface of the annular notch 1103, thereby sealing the gap between the top end surface of the positioning ring 1101 and the top end surface of the annular notch 1103. At this time, in order to achieve the reset of the hydraulic oil, the hydraulic oil will flow back to the spring buffer chamber 5 along the fourth channel 1105 and the third channel 1104. When the handle tube 2 is pressed down for the second time, most of the hydraulic oil will flow back to the spring buffer chamber 5.

[0119] Embodiment 5,

[0120] Embodiment 5 is carried out based on the above embodiments.

[0121] like Figure 1 , 2 and 3

[0122] A hydraulic shock absorber with good damping effect comprises a handle tube 2 and an outer sleeve 1 which can be relatively slidably arranged, a piston rod 3 fixed to the bottom of the inner cavity of the outer sleeve 1, and the piston rod 3 has any one of the hydraulic damping systems in the first to fourth embodiments.

[0123] A buffer member 10 is sleeved on the piston rod 3 at the bottom of the outer sleeve 1.

[0124] When the handle tube 2 is pressed down, the oil passage 9 is blocked by the buffer 10 so that the hydraulic oil is blocked. The oil passage 9 has a plurality of oil passages 9. When the handle tube 2 is pressed down to contact the top surface of the buffer 10, the inlet end surface of the oil passage 9 fits with the top surface of the buffer 10. At this time, the hydraulic oil cannot be injected into the oil passage 9, thereby ensuring that the handle tube 2 will not continue to be pressed down, and the possibility of the handle tube 2 hitting the bottom is well avoided. The buffer 10 is a rubber part. By using the rubber part, when the handle tube 2 is pressed down, if it is pressed down too hard, it will cause an impact on the outer sleeve 1. In order to better protect the handle tube 2, the buffer 10 is set at the root of the piston rod 3 to protect the handle tube 2 and prevent it from hitting the bottom. The hydraulic damping system is combined with the buffer 10 made of rubber, so that the shock absorber achieves a good lightweight effect.

[0125] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A hydraulic damping system, characterized in that: include: an oil passage sleeved on the piston rod, and The oil passage is fixed in the inner wall of the lower end of the handle tube; in When the handle tube is pressed downward, the hydraulic oil can be squeezed into the spring buffer chamber through the oil passage; When the handle tube is lifted, the hydraulic oil can flow back to the hydraulic storage chamber; The end of the piston rod has a piston head; When the handle tube is pressed down, the hydraulic oil can pass through the piston head from the spring buffer chamber to the spring placement chamber; When the handle tube is lifted, the hydraulic oil can pass through the piston head from the spring placement chamber to the spring buffer chamber; The piston rod is provided with an oil filling hole, an open top end, and a connecting passage connecting the oil filling hole and the open top end, wherein the open top end is located in the spring placement cavity; The piston head comprises a positioning ring which is interference-fitted with the inner wall of the handle tube and a sleeve ring which is sleeved on the end of the piston rod; and An annular notch is formed on the outer ring of the sleeve, and a third channel is formed on the bottom end surface of the annular notch along the sliding direction of the handle tube; The positioning ring is clamped in the annular notch, the bottom end face of the positioning ring is staggered with the inlet end face of the third channel, and the height of the positioning ring is smaller than the height of the annular notch; As the handle tube continues to be pressed downward, part of the hydraulic oil will flow into the third channel on the piston head and then into the annular notch. At this time, the locating ring and the inner wall of the handle tube are interference fit, and the two are relatively fixed. The handle tube will drive the locating ring to be pressed downward so that the bottom end face of the locating ring fits with the bottom end face of the annular notch. There is a gap between the top surface of the positioning ring and the top surface of the annular notch, and there is also a gap between the outer wall of the piston head and the inner wall of the handle tube; The oil passage portion comprises a shielding portion and a switching piece which are sequentially sleeved on the piston rod from top to bottom; The on-off piece is provided with a plurality of oil passages along the sliding direction of the handle tube; The shielding part is covered on the on-off piece to block the oil passage; wherein When the handle tube is pressed downward, the hydraulic oil can pass through the oil passage and squeeze through the shielding portion.

2. The hydraulic damping system according to claim 1, characterized in that: The on-off piece is provided with a first flow channel along the sliding direction of the handle tube; The shielding portion is provided with a second flow channel connected to the first flow channel along the sliding direction of the handle tube; When the handle tube is lifted, the hydraulic oil can flow back to the hydraulic storage chamber through the second flow channel and the first flow channel in sequence.

3. The hydraulic damping system according to claim 1, characterized in that: A second flow channel communicating with the oil passage is provided on the shielding portion along the sliding direction of the handle tube; The piston rod is provided with an oil return hole, an oil injection hole and a return flow passage connecting the oil return hole and the oil injection hole; and The oil passage portion is located on the piston rod between the oil return hole and the oil injection hole; in When the handle tube is lifted, the hydraulic oil can flow back from the oil return hole of the spring buffer chamber to the hydraulic storage chamber at the oil filling hole.

4. The hydraulic damping system according to claim 2 or 3, characterized in that: The shielding portion comprises a first gasket, a spring sheet and a second gasket which are sleeved on the piston rod from top to bottom; The second flow channel includes a first channel opened on the first gasket and a second channel opened on the second gasket; in When the handle tube is pressed downward, the hydraulic oil can sequentially pass through the oil passage, the second passage, and the first passage and reach the spring buffer chamber.

5. The hydraulic damping system according to claim 1, characterized in that: A fourth channel is provided on the top surface of the annular notch along the sliding direction of the handle tube, and the fourth channel is connected to the third channel. The top end surface of the positioning ring is staggered with the inlet end surface of the fourth channel.

6. A hydraulic shock absorber with good damping effect, comprising a handle tube and an outer sleeve which can be relatively slidably arranged, and a piston rod fixed to the bottom of the inner cavity of the outer sleeve, characterized in that: The piston rod has a hydraulic damping system as claimed in any one of claims 1 to 5, A buffer is fixed on the piston rod at the bottom of the outer sleeve, wherein When the handle tube is pressed downward, the oil passage is blocked by the buffer component so that the hydraulic oil is blocked.

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