Shock Absorption System and Vehicle

Abstract

The present disclosure relates to the technical field of shock absorbers, and particularly to a shock absorption system and a vehicle. The shock absorption system includes: a shock absorber, an oil pressure switching mechanism, and an energy recovery mechanism. The shock absorber includes a main cylinder body and a main piston mechanism. The main cylinder body has a main cylinder cavity; the main piston mechanism is disposed in the main cylinder cavity, and the main piston mechanism divides the main cylinder cavity into a first main cavity and a second main cavity; the main piston mechanism includes a main piston rod; the oil pressure switching mechanism includes a high-pressure cylinder and a low-pressure cylinder, and the high-pressure cylinder is connected to the low-pressure cylinder through a first pipeline; the first pipeline is connected to a first rod cavity; the shock absorber is connected to the oil pressure switching mechanism, and the oil pressure switching mechanism is connected to the energy recovery mechanism; the inlet end of the energy recovery mechanism is connected to the high-pressure cylinder, and the outlet end of the energy recovery mechanism is connected to the low-pressure cylinder. The present disclosure can reduce the occurrence of vehicle rollover and can also achieve energy recovery.

Description

Technical Field

[0001] The present disclosure relates to the technical field of shock absorbers, and in particular, to a shock absorption system and a vehicle. Background Art

[0002] The low energy consumption of the shock absorber of a vehicle is closely related to the softness and hardness of the shock absorption spring. The energy loss mainly has three parts. The first part is that a hard spring will cause large deformation of the tire on the ground and energy loss. The second part is that a hard spring cannot produce good deformation between the tire and the vehicle body, resulting in increased energy loss of the vehicle's wind resistance due to the up and down floating of the vehicle running along the road surface. The third part is that a hard spring stores a large amount of road surface impact energy when the vehicle is running at a high speed, and this part of energy is damped by the piston of the shock absorber, resulting in energy consumption. Summary of the Invention

[0003] The present disclosure provides a shock absorption system and a vehicle to solve the technical problem that the inventor recognizes that the vehicle is prone to rollover and energy loss are contradictory and one cannot have both.

[0004] The present disclosure provides a shock absorption system, which includes:

[0005] A shock absorber, the shock absorber includes a main cylinder body and a main piston mechanism. The main cylinder body has a main cylinder cavity. The main piston mechanism is disposed in the main cylinder cavity. The main piston mechanism divides the main cylinder cavity into a first main cavity and a second main cavity. The main piston mechanism is configured to be able to move axially along the main cylinder cavity. The main piston mechanism includes a main piston rod, and the main piston rod has a first rod cavity. A first cavity hole is formed on the main piston rod, and the first cavity hole is communicated with the first main cavity;

[0006] An oil pressure switching mechanism, the oil pressure switching mechanism includes a high-pressure cylinder and a low-pressure cylinder. The high-pressure cylinder and the low-pressure cylinder are connected by a first pipeline. The high-pressure cylinder is provided with a third one-way valve for flowing from the first pipeline to the high-pressure cylinder, and the low-pressure cylinder is provided with a fourth one-way valve for flowing from the low-pressure cylinder to the first pipeline. The first pipeline is communicated with the first rod cavity; and

[0007] An energy recovery mechanism, the shock absorber is communicated with the oil pressure switching mechanism, and the oil pressure switching mechanism is communicated with the energy recovery mechanism. The inlet end of the energy recovery mechanism is communicated with the high-pressure cylinder, and the outlet end of the energy recovery mechanism is communicated with the low-pressure cylinder.

[0008] Further, a pressurizing structure is formed between the main piston rod and the main cylinder cavity, and the pressurizing structure is configured to be able to make the fluid flow unidirectionally towards the first rod cavity.

[0009] Further, the main piston mechanism further includes a secondary piston rod, which is installed in the first rod cavity and is configured to be able to move relative to the main piston rod.

[0010] Further, a second cavity hole is also formed in the main piston rod. The first cavity hole is located above the second cavity hole, and the second cavity hole communicates with the second main cavity; the bottom end of the secondary piston rod has a secondary bottom piston, and the secondary bottom piston is configured to be able to move to the position of the second cavity hole so that the connection between the second main cavity and the first rod cavity can be disconnected at the second cavity hole.

[0011] Further, the pressurizing structure includes a main bottom piston provided at the bottom end of the main piston rod, a first one-way valve provided on the main bottom piston, and a second one-way valve provided at the bottom of the main cylinder block; when the main piston rod moves along the axial direction of the main cylinder cavity, the first one-way valve and the second one-way valve can be alternately opened.

[0012] Further, the top of the secondary piston rod has a secondary top piston, and the secondary top piston is limited on the main piston rod so that the secondary top piston can move within a set range.

[0013] Further, the energy recovery mechanism includes an inlet pipe, a constant pressure valve structure, an energy recovery device and an outlet pipe; one end of the inlet pipe communicates with the high-pressure cylinder, the other end of the inlet pipe communicates with the constant pressure valve structure, the constant pressure valve structure communicates with the energy recovery device, the energy recovery device is also connected to one end of the outlet pipe, and the other end of the outlet pipe communicates with the low-pressure cylinder.

[0014] Further, the constant pressure valve structure includes a constant pressure valve body, a first guide rod, a first nut, a compression spring, a third spring seat and a moving piston; one end of the first guide rod is fixedly connected to the moving piston, the first nut is threadedly connected to the first guide rod, one end of the compression spring abuts against the first nut, the other end of the compression spring abuts against the third spring seat, and the third spring seat is detachably fixed in the valve cavity of the constant pressure valve body; the first nut is located on one side of the third spring seat, and the moving piston is located on the opposite side of the third spring seat; a high-pressure jet hole is formed in the peripheral wall of the outlet of the valve cavity of the constant pressure valve body; a third flow hole is formed in the third spring seat; the moving piston can block the high-pressure jet hole.

[0015] Further, the third one-way valve includes a first valve housing, a first valve stem, a first valve disc and a first valve spring; a first side valve hole is formed in the side wall of the first valve housing, one end of the first valve stem is fixedly connected to the first valve disc, the first valve stem is inserted on the first valve housing, and the first valve stem can move relative to the first valve housing; one end of the first valve spring abuts against the first valve disc, and the other end of the first valve spring abuts against the bottom of the first valve housing; a first main valve hole is further formed in the first valve housing; the first valve disc is used to block the first main valve hole; when the pressure in the first pipeline is greater than the pressure in the high-pressure cylinder, the first valve disc moves downward, so that the first main valve hole and the first side valve hole are communicated with each other;

[0016] The fourth one-way valve includes a second valve housing, a second valve stem, a second valve disc and a second valve spring; a second top valve hole is formed in one surface of the second valve housing, and a second bottom valve hole is formed in the other surface opposite to the second valve housing; one end of the second valve stem is fixedly connected to the second valve disc, the second valve stem is inserted on the second valve housing, and the second valve stem can move relative to the second valve housing; one end of the second valve spring abuts against the second valve disc, and the other end of the second valve spring abuts against the outer top surface of the second valve housing; the second valve disc is used to block the second top valve hole; when the pressure in the low-pressure cylinder is greater than the pressure in the first pipeline, the second valve disc moves downward, so that the second top valve hole and the second bottom valve hole are communicated with each other, so that the second top valve hole and the first pipeline are communicated with each other.

[0017] The present disclosure further provides a vehicle, which includes: a vehicle body, steerable wheels connected to the vehicle body, and the shock absorption system; the main piston rod is connected to the vehicle body, and the main cylinder body is connected to the wheels, and is used to enable the main cylinder body to rotate relative to the main piston rod when the wheels turn.

[0018] The beneficial effects of the present disclosure mainly lie in:

[0019] The shock absorption system and vehicle provided by the present disclosure, the shock absorber thereof includes a shock absorber, an oil pressure switching mechanism and an energy recovery mechanism; the shock absorber includes a main cylinder block and a main piston mechanism, the main cylinder block has a main cylinder cavity; the main piston mechanism is arranged in the main cylinder cavity, the main piston mechanism divides the main cylinder cavity into a first main cavity and a second main cavity, and the main piston mechanism is configured to be able to move along the axial direction of the main cylinder cavity; the main piston mechanism includes a main piston rod, the main piston rod has a first rod cavity; a first cavity hole is formed in the main piston rod, and the first cavity hole is communicated with the first main cavity; the oil pressure switching mechanism includes a high-pressure cylinder and a low-pressure cylinder, the high-pressure cylinder and the low-pressure cylinder are communicated through a first pipeline, a third one-way valve for flowing from the first pipeline to the high-pressure cylinder is arranged on the high-pressure cylinder, and a fourth one-way valve for flowing from the low-pressure cylinder to the first pipeline is arranged on the low-pressure cylinder; the first pipeline is communicated with the first rod cavity; the shock absorber is communicated with the oil pressure switching mechanism, and the oil pressure switching mechanism is communicated with the energy recovery mechanism; the inlet end of the energy recovery mechanism is communicated with the high-pressure cylinder, and the outlet end of the energy recovery mechanism is communicated with the low-pressure cylinder. This shock absorption system and vehicle can reduce the occurrence of vehicle rollover and can realize energy recovery.

[0020] It should be understood that both the foregoing general description and the following detailed description are for the purpose of illustration and example only and are not necessarily limiting of the present disclosure. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the subject matter of the present disclosure. At the same time, the specification and the drawings are used to explain the principles of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 is a schematic structural diagram of a shock absorber in one or more embodiments of the present disclosure;

[0023] Figure 2 is Figure 1 a partial enlarged schematic diagram at position B in

[0024] Figure 3 is a schematic structural diagram of a piston valve sheet in one or more embodiments of the present disclosure;

[0025] Figure 4 is a schematic structural diagram of a first piston in one or more embodiments of the present disclosure;

[0026] Figure 5 is a schematic structural diagram of a piston valve plate in one or more embodiments of the present disclosure;

[0027] Figure 6 Schematic diagram of the structure of the fourth one-way valve in one or more embodiments of the present disclosure;

[0028] Figure 7 Schematic diagram of the structure of the third one-way valve in one or more embodiments of the present disclosure;

[0029] Figure 8 Schematic diagram of the structure of the shock absorption system in one or more embodiments of the present disclosure;

[0030] Figure 9 is Figure 8 Partial enlarged structure diagram at position A in

[0031] Figure 10 Another schematic diagram of the structure of the shock absorption system in one or more embodiments of the present disclosure.

[0032] Icon:

[0033] 101 - Main cylinder block; 102 - First main chamber; 103 - Second main chamber; 104 - Main piston rod; 105 - Auxiliary piston rod; 106 - First rod chamber; 107 - Main bottom piston; 108 - First flow hole; 109 - Flow - through ball; 110 - Cylinder block seat; 111 - Second flow hole; 112 - Check valve disc; 113 - First chamber hole; 114 - Second chamber hole; 115 - Auxiliary bottom piston; 120 - Auxiliary top piston; 121 - Top spring; 122 - Main piston cap; 123 - Side cap hole; 124 - Top cap hole; 125 - First spring seat; 126 - Auxiliary pressure cylinder; 127 - Auxiliary pressure chamber; 128 - Main bottom chamber; 129 - Pressure storage chamber port; 130 - Discharge port; 135 - High - pressure cylinder; 136 - Low - pressure cylinder; 137 - First pipeline; 138 - First valve housing; 139 - First valve rod; 140 - First valve disc; 141 - First valve spring; 142 - First side valve hole; 143 - First main valve hole; 144 - Second valve housing; 145 - Second valve rod; 146 - Second valve disc; 147 - Second valve spring; 148 - Second top valve hole; 149 - Second bottom valve hole; 150 - First communication pipeline; 151 - Second communication pipeline; 152 - Inlet pipe; 153 - Constant - pressure valve structure; 154 - Outlet pipe; 157 - Constant - pressure valve body; 158 - First conductor; 159 - First nut; 160 - Compression spring; 161 - Third spring seat; 162 - Moving piston; 163 - High - pressure jet hole; 164 - Third flow hole; 165 - Turbine; 166 - Pulley; 167 - Third communication pipeline; 168 - Oil cup; 171 - First flow channel; 172 - First guide rod; 180 - Piston valve disc; 181 - First piston; 182 - Piston valve plate; 183 - Valve plate oil - through hole; 184 - First sliding hole; 185 - Second sliding hole; 186 - Piston oil - through hole; 187 - Slide rod; 188 - First nut; 189 - Valve disc spring; 190 - Union joint; 191 - Third chamber hole; 192 - Second rod chamber; 194 - Fourth chamber hole; 195 - Circlip. Detailed implementation manners

[0034] The technical solutions of the present disclosure will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present disclosure.

[0035] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0036] In the description of the present disclosure, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present disclosure. In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0037] In the description of the present disclosure, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0038] See Figures 1 to 5 As shown, in one or more embodiments, the shock absorber provided by the present disclosure includes a main cylinder body 101 and a main piston mechanism. The main cylinder body 101 has a main cylinder cavity; the main piston mechanism is disposed in the main cylinder cavity. The main piston mechanism divides the main cylinder cavity into a first main cavity 102 and a second main cavity 103, and the main piston mechanism is configured to be able to move axially along the main cylinder cavity; wherein, the main piston mechanism includes a main piston rod 104 and a sub-piston rod 105. The main piston rod 104 has a first rod cavity 106, and the sub-piston rod 105 is installed in the first rod cavity 106, and the sub-piston rod 105 is configured to be able to move relative to the main piston rod 104; a pressurizing structure is formed between the main piston rod 104 and the main cylinder cavity, and the pressurizing structure is configured to be able to make the fluid flow unidirectionally into the first rod cavity 106. The pressurizing structure can adjust the pressure of the shock absorber and the shock absorption system.

[0039] In some embodiments, when the main piston mechanism moves in the main cylinder cavity, it can change the volume sizes of the first main cavity 102 and the second main cavity 103. The main piston mechanism can move axially along the main cylinder cavity, and the main piston mechanism can also rotate relative to the axis of the main cylinder body 101. The first rod cavity 106 extends axially along the main piston rod 104; when the main piston rod 104 moves axially along the main cylinder cavity, the pressurizing structure can make the fluid flow unidirectionally into the first rod cavity 106. The first main cavity 102 is located above the second main cavity 103.

[0040] The shock absorber provided in at least one embodiment moves axially along the main cylinder cavity within the main piston rod 104 through the main piston mechanism, and the pressurized structural fluid flows into the first rod cavity 106, so as to facilitate suppressing the downward movement of the main piston rod 104 of the shock absorber on the outer side of the vehicle during turning, thereby reducing the occurrence of vehicle rollover.

[0041] In some embodiments, the pressurized structure includes a main bottom piston 107 provided at the bottom end of the main piston rod 104, a first one-way valve provided on the main bottom piston 107, and a second one-way valve provided at the bottom of the main cylinder block 101; when the main piston rod 104 moves axially along the main cylinder cavity, the first one-way valve and the second one-way valve can be alternately opened.

[0042] In one embodiment, a first flow hole 108 is formed on the bottom surface of the main bottom piston 107, the first flow hole 108 is communicated with the first rod cavity 106, the main bottom piston 107 is detachably and fixedly connected to the main piston rod 104, an overcurrent ball 109 is arranged above the first flow hole 108, and the diameter of the overcurrent ball 109 is larger than that of the first flow hole 108. In this way, the overcurrent ball 109 and the first flow hole 108 cooperate to form a first one-way valve, enabling the fluid to enter the first rod cavity 106 unidirectionally through the first flow hole 108. A cylinder block seat 110 is fixed at the bottom of the main cylinder block 101, and the cylinder block seat 110 is detachably and fixedly connected to the main cylinder block 101. A second flow hole 111 is formed on the cylinder block seat 110, a one-way valve plate 112 is arranged above the second flow hole 111, and the diameter of the one-way valve plate 112 is larger than that of the second flow hole 111. In this way, the second flow hole 111 and the one-way valve plate 112 cooperate to form a second one-way valve, and the fluid can enter the main cylinder block 101 unidirectionally through the second flow hole 111. When the second one-way valve is opened, the first one-way valve can be in a closed state; when the first one-way valve is opened, the second one-way valve can be in a closed state. It should be noted that other one-way valves can also be used for the first one-way valve and the second one-way valve.

[0043] In some embodiments, a first cavity hole 113, a second cavity hole 114, and a third cavity hole 191 are formed in the main piston rod 104. The first cavity hole 113 is located above the second cavity hole 114, and the second cavity hole is located above the third cavity hole. The first cavity hole 113 communicates with the first main cavity 102, and the second cavity hole 114 and the third cavity hole communicate with the second main cavity 103 respectively. The auxiliary piston rod 105 has a second rod cavity 192, and the bottom of the second rod cavity communicates with the first rod cavity 106. The bottom end of the auxiliary piston rod 105 has an auxiliary bottom piston 115, and the auxiliary bottom piston 115 is configured to be able to move to the second cavity hole 114 so that the communication between the second main cavity 103 and the first rod cavity 106 can be disconnected at the second cavity hole 114. The auxiliary bottom piston 115 is further configured to be able to move to the third cavity hole 191 so that the communication between the second main cavity 103 and the first rod cavity 106 can be disconnected at the third cavity hole 191. A first flow channel 171 is formed in the auxiliary bottom piston 115. The auxiliary bottom piston 115 divides the first rod cavity 106 into an upper auxiliary cavity and a lower auxiliary cavity, and the first flow channel communicates the upper auxiliary cavity and the lower auxiliary cavity.

[0044] In some embodiments, the main piston rod 104 is mounted with a first piston 181, which cooperates with the main cylinder cavity. The first piston 181 can axially move relative to the main cylinder cavity and can rotate around the axis of the main cylinder cavity. The main piston rod 104 includes a first part and a second part, which are fixedly connected by a screwed joint 190; the first piston 181 is fixedly connected to the screwed joint; the outer rod diameter of the auxiliary piston rod 105 is smaller than the diameter of the axial hole in the screwed joint 190. The auxiliary piston rod is sleeved on the screwed joint; the auxiliary bottom piston 115 is located below the screwed joint. When the upper end surface of the auxiliary bottom piston 115 contacts the lower bottom surface of the screwed joint, the lower bottom surface of the screwed joint can close the upper port of the first flow passage 171; in one embodiment, the upper end surface of the auxiliary bottom piston 115 or the lower bottom surface of the screwed joint has a sealing ring, so that the upper port of the first flow passage 171 can be better closed. The first cavity hole 113 is located above the first piston, and the second cavity hole 114 is located below the first piston. The first piston is provided with piston oil through holes 186 and second sliding holes 185 that penetrate the upper and lower surfaces of the first piston; the number of piston oil through holes is multiple, and the multiple piston oil through holes are divided into multiple first hole rows, each first hole row includes several piston oil through holes, and the several piston oil through holes in each first hole row are spaced along the radial direction of the first piston. The central angle between each first hole row can be 90 degrees. The number of the second sliding holes is two, and the two second sliding holes are symmetrically arranged at the center; the length extension direction of the second sliding hole is arc-shaped. A piston valve plate 182 is further provided below the first piston, and the piston valve plate is sleeved on the main piston rod; the piston valve plate is further provided with multiple valve plate oil through holes 183, and the multiple valve plate oil through holes are divided into multiple second hole rows, each second hole row includes several valve plate oil through holes, and the several valve plate oil through holes in each second hole row are spaced along the radial direction of the first piston. The central angle between each second hole row can be 90 degrees. The piston valve plate is further provided with a first sliding hole 184. A piston valve piece 180 is further provided on the upper surface of the first piston, and the piston valve piece is also provided with a first sliding hole 184. Two sliding rods 187 are fixed in the main cylinder cavity, and the two sliding rods 187 are symmetrically arranged with the axis of the main cylinder cavity as the symmetry axis. The sliding rods pass through the first sliding hole 184 of the piston valve piece, the second sliding hole 185 of the first piston 181, and the first sliding hole 184 of the piston valve plate 182. The first piston 181 can axially move along the sliding rods. A first nut 188 is further fixed on the main piston rod 104, a valve piece spring 189 is arranged between the first nut and the piston valve piece 180, and both ends of the valve piece spring are abutted against the first nut and the piston valve piece respectively. The piston valve piece is sleeved on the screwed joint, the piston valve plate is sleeved on the screwed joint, and the piston valve piece can block the piston oil through holes. The piston valve plate is limited on the screwed joint by the second part, and the piston valve plate can move within a set range in the axial direction of the alignment joint.When the first piston moves downward, when the oil pressure in the second main chamber can overcome the elastic force of the valve plate spring, the oil can pass through the oil through holes of the valve plate and the piston oil through holes, and push open the piston valve plate to enter the first main chamber. When the main piston rod rotates around its own axis, the first piston can also rotate, and the slide rod can move along the length direction of the second slide hole relative to the first piston, so that the oil through hole of the valve plate and the piston oil through hole are staggered, so that the first main chamber and the second main chamber can be disconnected.

[0045] In some embodiments, the top of the secondary piston rod 105 has a secondary top piston 120, and the secondary top piston 120 is limited on the main piston rod 104 so that the secondary top piston 120 can move within a set range. The secondary top piston 120 facilitates the movement of the secondary piston rod 105 in the main piston rod 104.

[0046] In one embodiment, the secondary top piston 120 at the top of the secondary piston rod 105 is located above the secondary bottom piston 115. The top of the main piston rod 104 is detachably fixed with a main piston cap 122. A side cap hole 123 is provided on the side surface of the main piston cap 122, and a top cap hole 124 is provided on the top surface of the main piston cap 122. The top end of the secondary top piston rod 105 is slidably matched with the top cap hole 124, and the second rod chamber 192 is communicated with the top cap hole 124; the main piston cap 122 has a hollow structure. Above the side cap hole 123, there is a first spring seat 125. The upper part of the first spring seat 125 divides the hollow structure of the main piston cap 122, so that a cap chamber is formed above the first spring seat, so that the secondary top piston can move within a set range; above the secondary top piston 120, there is a top spring 121. One end of the top spring 121 abuts against the main piston cap 122, and the other end of the top spring 121 abuts against the secondary top piston 120. The secondary top piston 120 is slidably matched with the cap chamber of the main piston cap 122. A fourth chamber hole 194 is also provided on the secondary piston rod 105. The fourth chamber hole 194 is located below the secondary top piston 120. A snap ring 195 is also provided on the secondary piston rod. The snap ring is located below the fourth chamber hole 194 and in the cap chamber of the main piston cap between the secondary top piston and the first spring seat 125. Since the snap ring can abut against and limit the upper end surface of the first spring seat 125, the fourth chamber hole 194 can be located in the cap chamber of the main piston cap between the secondary top piston and the first spring seat. When the fluid pressure in the cap chamber of the main piston cap 122 below the secondary top piston 120 is greater than the pressure of the top spring 121, the secondary top piston 120 will move upward, so that the secondary piston rod 105 moves upward, so that the secondary bottom piston 115 moves relative to the main piston rod 104, so that the second chamber hole 114 can be blocked by the secondary bottom piston 115, and the upper port of the first flow channel 171 can be closed. The side cap hole 123 is communicated with the first rod chamber 106. It should be noted that the vertical position of the snap ring on the secondary piston rod can be adjusted as needed to meet the up and down movement of the secondary bottom piston 115.

[0047] In some embodiments, the shock absorber further includes a secondary pressure cylinder 126 disposed at the bottom of the main cylinder block 101. A secondary pressure chamber 127 is formed between the outer wall of the secondary pressure cylinder 126 and the inner wall of the main cylinder block 101. The secondary pressure chamber 127 communicates with the second main chamber 103. The main bottom piston 107 is configured to be inserted into the cylinder chamber of the secondary pressure cylinder 126 and move along the cylinder chamber of the secondary pressure cylinder 126. By providing the secondary pressure cylinder 126, it is beneficial to expand the second main chamber 103 and achieve buffering.

[0048] In one embodiment, the secondary pressure cylinder 126 is detachably fixed in the main cylinder chamber, and the main bottom piston 107 cooperates with the cylinder chamber of the secondary pressure cylinder 126. The space between the main bottom piston 107 and the cylinder block seat 110 forms a main bottom chamber 128. The secondary pressure cylinder 126 has an annular structure. A pressure storage chamber opening 129 is provided on the upper ring surface of the secondary pressure cylinder 126, and a discharge port 130 is provided on the lower ring surface of the secondary pressure cylinder 126. The discharge port 130 communicates with the main bottom chamber 128, and the pressure storage chamber opening 129 communicates with the second main chamber 103. The diameter of the pressure storage chamber opening 129 is larger than the diameter of the discharge port 130.

[0049] It should be noted that the secondary pressure cylinder 126 can also be detachably connected to the bottom end of the main cylinder block 101, that is, the secondary pressure cylinder 126 is located outside the main cylinder block 101.

[0050] It should be noted that in some other embodiments, the relative rotation angle between the main piston rod 104 and the main cylinder block 101 is fixed, and a limiting structure is provided between the main piston rod 104 and the main cylinder block 101 to limit the rotation angle between the main piston rod 104 and the main cylinder block 101.

[0051] In some embodiments, the shock absorber further includes a shock-absorbing spring (not shown) sleeved outside the main cylinder block 101. The shock-absorbing spring is used to shock-absorb the vehicle body (or frame). In addition, a second spring seat can be fixed on the main cylinder block 101 so that the lower end of the shock-absorbing spring abuts against the second spring seat; the upper end of the shock-absorbing spring abuts against the fourth spring seat fixed to the top of the main piston rod 104.

[0052] See Figures 6 to 10 As shown, in one or more embodiments, the present disclosure further provides a shock-absorbing system, which includes at least one shock absorber provided in the embodiments, an oil pressure switching mechanism, and an energy recovery mechanism. The shock absorber communicates with the oil pressure switching mechanism, and the oil pressure switching mechanism communicates with the energy recovery mechanism. The pressure of the shock-absorbing system is adjusted through the oil pressure switching mechanism, and energy can be recovered through the energy recovery mechanism.

[0053] In some embodiments, the oil pressure switching mechanism includes a high-pressure cylinder 135 and a low-pressure cylinder 136. The high-pressure cylinder 135 and the low-pressure cylinder 136 are connected and communicated with each other through a first pipeline 137. A third one-way valve for the fluid to flow from the first pipeline 137 into the high-pressure cylinder 135 is provided on the high-pressure cylinder 135, and a fourth one-way valve for the fluid to flow from the low-pressure cylinder 136 into the first pipeline 137 is provided on the low-pressure cylinder 136. The first pipeline 137 is connected and communicated with the first rod chamber 106. The pressure switching between the shock absorber and the energy recovery mechanism is realized through the high-pressure cylinder 135 and the low-pressure cylinder 136.

[0054] In one embodiment, the third one-way valve includes a first valve housing 138, a first valve stem 139, a first valve disc 140 and a first valve spring 141. A first side valve hole 142 is formed in the side wall of the first valve housing 138. One end of the first valve stem 139 is fixedly connected to the first valve disc 140. The first valve stem 139 is inserted into the first valve housing 138 and can move relative to the first valve housing 138. One end of the first valve spring 141 abuts against the first valve disc 140, and the other end of the first valve spring 141 abuts against the bottom of the first valve housing 138. A first main valve hole 143 is further formed in the first valve housing 138. The first valve disc 140 is used to block the first main valve hole 143. When the pressure in the first pipeline 137 is greater than the resultant force of the pressure in the high-pressure cylinder and the elastic force of the first valve spring 141, the first valve disc 140 moves downward, so that the first main valve hole 143 and the first side valve hole 142 are connected and communicated, and thus the fluid in the first pipeline 137 flows into the high-pressure cylinder 135. The fourth one-way valve includes a second valve housing 144, a second valve stem 145, a second valve disc 146 and a second valve spring 147. A second top valve hole 148 is formed in one surface of the second valve housing, and a second bottom valve hole 149 is formed in the other opposite surface of the second valve housing. One end of the second valve stem 145 is fixedly connected to the second valve disc 146. The second valve stem 145 is inserted into the second valve housing 144 and can move relative to the second valve housing 144. One end of the second valve spring 147 abuts against the second valve disc 146, and the other end of the second valve spring 147 abuts against the outer top surface of the second valve housing 144. The second valve disc 146 is used to block the second top valve hole 148. When the pressure in the low-pressure cylinder 136 is greater than the resultant force of the pressure in the first pipeline and the elastic force of the second valve spring 147, the second valve disc 146 moves downward, so that the second top valve hole 148 and the second bottom valve hole 149 are connected and communicated, and thus the fluid in the low-pressure cylinder 136 flows into the first pipeline 137.

[0055] In some embodiments, the first pipeline 137 is connected and communicated with the first rod chamber 106 of the shock absorber through a first communication pipeline 150. Specifically, the first pipeline 137 is connected and communicated with the side cap hole 123 through the first communication pipeline 150, and the side cap hole 123 is connected and communicated with the first rod chamber 106. The low-pressure cylinder 136 is connected and communicated with the top cap hole 124 through a second communication pipeline 151.

[0056] In some embodiments, the inlet end of the energy recovery mechanism is connected to the high-pressure cylinder 135, and the outlet end of the energy recovery mechanism is connected to the low-pressure cylinder 136. The energy recovery mechanism is used to recover energy.

[0057] In some embodiments, the energy recovery mechanism includes an inlet pipe 152, a constant-pressure valve structure 153, an energy recovery device, and an outlet pipe 154; one end of the inlet pipe 152 (i.e., the inlet end of the energy recovery mechanism) is connected to the high-pressure cylinder 135, the other end of the inlet pipe 152 is connected to the constant-pressure valve structure 153, the constant-pressure valve structure 153 is connected to the energy recovery device, the energy recovery device is also connected to one end of the outlet pipe 154, and the other end of the outlet pipe 154 (i.e., the outlet end of the energy recovery mechanism) is connected to the low-pressure cylinder 136.

[0058] In some embodiments, the constant-pressure valve structure 153 includes a constant-pressure valve body 157, a first guide rod 172, a first nut 159, a compression spring 160, a third spring seat 161, and a moving piston 162; one end of the first guide rod is fixedly connected to the moving piston 162, the first nut 159 is threadedly connected to the first guide rod, one end of the compression spring 160 abuts against the first nut 159, the other end of the compression spring 160 abuts against the third spring seat 161, and the third spring seat 161 is detachably fixed in the valve cavity of the constant-pressure valve body 157. The first nut 159 is located on one side of the third spring seat 161, and the moving piston 162 is located on the opposite side of the third spring seat 161; a high-pressure jet hole 163 is formed in the peripheral wall of the outlet of the valve cavity of the constant-pressure valve body 157; a third flow hole 164 is formed in the third spring seat 161; the moving piston 162 can block the high-pressure jet hole 163. When the fluid pressure in the inlet pipe 152 is greater than the elastic force of the third spring, the fluid pushes the moving piston 162 away through the third flow hole 164, so that the high-pressure jet hole 163 is opened, and thus the fluid sprays out from the high-pressure jet hole 163 and flows into the energy recovery device, so that the energy recovery device works to realize energy conversion and recovery, and then the fluid flows back into the low-pressure cylinder 136 through the outlet pipe 154.

[0059] In one embodiment, as shown in Figure 8 the energy recovery device includes a turbine 165, the turbine 165 is linked with a pulley 166, and the pulley 166 is linked with a generator to convert energy into electric energy. It should be noted that the energy recovery device may also adopt an energy recovery device with a piston (see Figure 10 ), or other types of energy recovery devices in the prior art to realize energy recovery.

[0060] In some embodiments, a second flow hole 111 on a cylinder block seat 110 of a shock absorber is connected to an oil cup 168 through a third communication pipeline 167. The upper part of the oil cup 168 is open and communicates with the atmosphere.

[0061] In some embodiments, the number of shock absorbers in the shock absorption system is 1 to 4, the number of oil pressure switching mechanisms is 1 or 2, and the number of energy recovery mechanisms is one. It should be noted that the number of oil pressure switching mechanisms and energy recovery mechanisms in the shock absorption system is not limited to 1 or 2, and can also be multiple, such as 2, 3, or 4, etc., which is determined according to the actual situation.

[0062] Since a vehicle may encounter different road conditions during driving, after the shock absorption system is installed on the vehicle, its working conditions are relatively complex. Therefore, the present disclosure only describes several working conditions and does not elaborate on other complex working conditions. The main piston rod 104 of the shock absorber of the shock absorption system disclosed in the present disclosure is connected to the vehicle body, and the connecting ear provided on the main cylinder block 101 of the shock absorber is connected to the wheel. A shock absorber is installed at each wheel.

[0063] See Figures 6 to 10As shown, the shock absorption system provided by at least one embodiment of the present disclosure can achieve energy recovery and reduce the shock absorption energy consumption of the vehicle, and can also solve the problem that the vehicle is prone to rollover when using a soft spring. Since the shock absorber of the present disclosure is provided with a pressurizing structure, the shock absorber of the present disclosure is equivalent to a self-charging shock absorber; initially, it is necessary to slowly move straight for stamping. When the main piston rod 104 of the shock absorber moves up and down, the volume of the main bottom cavity 128 will increase or decrease. When the volume of the main bottom cavity 128 decreases, the squeezed oil pushes the flow-through ball 109 through the first flow hole 108 and the oil enters the first rod cavity 106; when the main bottom piston 107 moves upward, the volume of the main bottom cavity 128 increases, and at the same time the flow-through ball drops, a vacuum negative pressure is generated in the main bottom cavity 128, and the one-way valve piece 112 moves upward to open the second flow hole 111, sucking the medium in the oil cup 168 (which can be air or oil, and the upper opening of the oil cup 168 communicates with the outside atmosphere). When the main bottom piston 107 moves up and down repeatedly, the compressed medium moves upward along the first rod cavity 106. When it reaches the secondary bottom piston 115, a part of it flows out from the third cavity hole 191 and returns to the main bottom cavity 128 to supplement the compressed medium, and moves up and down continuously in the secondary pressure cavity 127. Another part of the pressure will continuously be transmitted upward through the first flow channel 171 and pressurize the first main cavity 102 along the way, and then successively push open the first valve piece 140 through the side cap hole 123 and the first connecting pipeline 150 and enter the high-pressure cylinder 135. When the shock absorber moves for a certain period of time, the pressure in the high-pressure cylinder 135 continuously increases, and the oil pressure overcomes the compression spring 160 to push open the moving piston 162 and the high-pressure jet hole 163 flows out at high speed and enters the low-pressure cylinder 136 through the outlet pipe 154. At this time, the pressure enters the top cap hole 124 through the second connecting pipeline 151 and flows out from the fourth cavity hole 194, and acts on the secondary top piston 120; the secondary piston rod 105 can feedback the pressure. When the pressure reaches the set value, it overcomes the top spring 121 to push the secondary top piston 120 upward, driving the secondary piston rod 105 and the secondary bottom piston 115 to move upward together. The secondary bottom piston 115 blocks the upper openings of the second cavity hole 114 and the first flow channel 171, blocking the stamping oil medium from entering the main bottom cavity 128, so that the up and down movement of the main bottom piston 107 cannot form a vacuum negative pressure, and the one-way valve piece 112 is not easily opened. At this time, the stamping of the shock absorber ends. The low-pressure cylinder 136 supplements the pressure loss of the second main cavity 103 chamber due to the up and down movement of the first piston 181 through the second rod cavity 192 and the third cavity hole 191.

[0064] When a vehicle moving straight encounters a raised road surface, when the charging pressure of the shock absorber reaches the set value, the vehicle can move at high speed; on the raised road surface, the first piston 181 moves downward relative to the main cylinder block 101, that is, the distance between the tire and the vehicle body decreases, the volume of the second main chamber 103 decreases and the pressure rises. At this time, the flow area of the through hole formed by the first piston 181 and the piston valve plate 182 is the largest, and the pressure overcomes the spring force of the spring disc spring 189 to push the piston valve plate 180 upward. A certain amount of air or oil enters the first main chamber 102 along the periphery of the piston valve plate 180. At the same time, the volume of the first main chamber 102 increases, and the medium flowing into the second main chamber 103 is not enough to fill the volume cavity of the first main chamber 102, so the pressure decreases. At this time, the pressure in the low-pressure cylinder is higher than the pressure in the first main chamber 102, and the oil medium overcomes the spring force of the second valve spring 147 to push open the second valve plate 146 and enters the first main chamber 102 through the first pipeline 137, the main piston cap 122, and the first rod chamber 106 to fill the increased volume space. The downward movement of the first piston 181 ends (here, for the movement of the shock absorber, theoretically, the aim is to reduce the resistance of the downward movement of the first piston 181 and reduce the final impact on the ground by the tire. Therefore, the first piston 181 is provided with a valve plate oil through hole 183 so that when the pressure in the second main chamber 103 is too high, the pressure is discharged from the first piston 181 and the piston valve plate 180 to the first main chamber 102).

[0065] When the vehicle goes uphill to a raised road surface and then enters a downhill section, the tires of the vehicle move relatively away from the vehicle body. The first piston 181 moves upward relative to the master cylinder block 101. The elastic potential energy of the shock-absorbing spring compressed outside the shock absorber will be released. Since the translational speed of the vehicle is much greater than the movement speed of the master piston rod 104 in most cases, the tires of the vehicle basically do not move downward along the curved track of the downhill raised road surface. Instead, the tires move away from the downhill road surface and are suspended. At this time, the elastic potential energy stored in the shock-absorbing spring will be released between the vehicle body and the tires, prompting the tires to hit the ground at high speed predictably (in the existing shock absorbers, the piston has a throttle hole to control the piston to move at a certain speed to consume this part of the energy, and the shock-absorbing system of the present disclosure is to recover this part of the energy). The hydraulic fluid in the first main chamber 102 is pulled by the master piston rod 104 to drive the first piston 181 to move upward relative to the master cylinder block 101 under the action of the elastic force of the shock-absorbing spring. The hydraulic fluid is pressed into the interior of the first rod chamber 106 through the first chamber hole 113 and moves upward, flows into the first communication pipeline 150 through the side cap hole 123, pushes open the third one-way valve and enters the high-pressure cylinder 135. At this time, the elastic potential energy of the shock-absorbing spring is converted into static pressure energy and stored in the high-pressure cylinder 135. The hydraulic fluid in the high-pressure cylinder 135 enters the constant pressure valve structure through one end of the inlet pipe 152. By adjusting the first nut 159, the compression degree of the compression spring 160 can be adjusted, and the compression degree of the compression spring 160 determines the pressure level in the high-pressure cylinder 135. The pressure level in the high-pressure cylinder 135 can control the speed of the hydraulic fluid in the first main chamber 102 entering the high-pressure cylinder 135. Therefore, by adjusting the pressure level in the high-pressure cylinder 135, the opening pressure of the third one-way valve, the first communication pipeline 150, the side cap hole 123, the first rod chamber 106, and the outflow speed of the hydraulic fluid from the first chamber hole 113 to the first main chamber 102 can be indirectly adjusted. In this way, the movement speeds of the first piston 181 and the master piston rod 104 are controlled, and the purpose of controlling and adjusting the relative movement speed between the vehicle body and the tires is achieved.

[0066] The anti-roll principle and energy recovery principle of the shock-absorbing system in the present disclosure are as follows:

[0067] 1. Anti-roll principle:

[0068] The shock-absorbing system of the present disclosure can increase the anti-roll ability of the vehicle at a curve and the stability of the vehicle during turning. When the vehicle enters a curve, under the action of centrifugal force and the shock-absorbing spring, there will be a relative movement tendency for the inner wheels of the vehicle to move away from the vehicle body, and a relative movement tendency for the outer wheels of the vehicle to move closer to the vehicle body.

[0069] The shock absorber is installed between the wheel and the vehicle body. The piston rod of the shock absorber is fixed to the vehicle body, and the main cylinder block 101 is fixed to the steering wheel. When the vehicle turns into a curve, the wheel drives the main cylinder block 101 to rotate synchronously. The main cylinder block 101 will axially move relative to the main piston rod 104. Since relative rotation also occurs between the main cylinder block 101 and the main piston rod 104, the position between the piston oil through hole 186 on the first piston 181 and the valve plate oil through hole 183 on the piston valve plate 182 is gradually misaligned to reduce the pressure area of the pressure acting on the piston valve plate 180 in the second main chamber 103, realizing the pressure maintaining of the second main chamber 103, making it difficult for the first piston 181 to move downward. The obtained force is transmitted to the vehicle body as a supporting force through the main piston rod 104, thereby suppressing the rollover of the outer side of the vehicle. When the turning degree of the curve increases, the ability to suppress the rollover of the outer side of the vehicle also increases. The piston oil through hole 186 on the first piston 181 and the valve plate oil through hole 183 on the piston valve plate 182 are completely misaligned and not connected. The second main chamber 103 is a closed space. When the first piston 181 moves downward, it will obtain greater supporting force from compressed air to suppress the continued movement of the first piston downward, and provide greater supporting force to the vehicle body through the main piston rod 104 to achieve smooth turning of the vehicle. At the same time, due to the centrifugal force of the inner wheel, the center of gravity of the vehicle shifts outward. Under the action of the shock absorber spring, there is a relative movement trend of moving away between the inner wheel and the vehicle body. Since the first main chamber 102 is filled with oil, this movement trend is suppressed. The oil in the first main chamber 102 acted on by the first piston 181 enters the first rod chamber 106 through the first chamber hole 113, and is transmitted to the third check valve and the fourth check valve through the side cap hole 123 and the first communication pipeline 150. Since the fourth check valve can only discharge oil and cannot intake oil, and in addition, the pressure of the oil cannot overcome the pressure in the high-pressure cylinder 135 to push open the third check valve, the first main chamber 102 forms a closed space. The oil in the first main chamber 102 has nowhere to go, which also suppresses the upward movement of the first piston 181 relative to the main cylinder block 101, and the elastic force of the shock absorber spring acting between the vehicle body and the wheel is also suppressed. The shock absorber spring cannot rebound, thereby suppressing the relative movement trend of moving away between the inner wheel and the vehicle body to prevent the vehicle from rolling over.

[0070] 2. Energy recovery:

[0071] When the vehicle is moving at a high speed, the main piston rod 104 and the first piston 181 of the shock absorber reciprocate up and down in the main cylinder block 101. The oil of the shock absorber in the prior art will consume the elastic potential energy from the shock absorber spring to control the movement speed of the first piston 181 of the shock absorber. However, the shock absorber and the shock absorption system in the present disclosure can not only store and reuse this impact energy, but also accurately control the movement speeds of the main piston rod 104 and the first piston 181.

[0072] When the vehicle is moving at high speed, the vehicle vibration is transmitted to the shock-absorbing spring, and the elastic potential energy of the shock-absorbing spring is transmitted to the main piston rod 104 and the first piston 181. The mechanical kinetic energy of the first piston 181 squeezes the hydraulic fluid in the first main chamber 102 and is converted into hydrodynamic pressure. The hydrodynamic pressure enters the first rod chamber 106 through the first chamber hole 113 and flows upward, flows out through the side cap hole 123, enters the first pipeline 137 through the first communication pipeline 150, and pushes open the third one-way valve to enter the high-pressure cylinder 135. Then it flows out through the inlet pipe 152 arranged at the bottom of the high-pressure cylinder 135 and enters the constant pressure valve structure 153. When the oil pressure overcomes the elastic force of the compression spring 160, it pushes open the moving piston 162 and jets out from the high-pressure jet hole 163. The jetted hydraulic fluid causes the turbine 165 to rotate. The turbine 165 drives the pulley 166 to rotate, generates electricity through the generator, and stores the electric energy in the battery or applies it to other devices. The hydraulic fluid that does work on the turbine 165 enters the low-pressure cylinder 136 through the outlet pipe 154. When the first piston 181 moves downward, the pressure in the first main chamber 102 decreases, and a pressure difference is generated between the low-pressure cylinder 136 and the first main chamber 102 of the first piston 181. The hydraulic fluid in the low-pressure cylinder 136 pushes open the fourth one-way valve and supplies oil to the first main chamber 102 of the first piston 181 through the side cap hole 123, completing a complete oil circuit cycle for recovering the vibration energy of the shock absorber through the oil medium.

[0073] In one or more embodiments, the present disclosure further provides a vehicle, which includes: a vehicle body, steerable wheels connected to the vehicle body, and a shock absorption system in at least one embodiment; the main piston rod 104 is connected to the vehicle body, and the main cylinder block 101 is connected to the wheels, and is configured to enable the main cylinder block 101 to rotate relative to the main piston rod 104 when the wheels are steered. It should be noted that the wheels are connected to the vehicle body, and the vehicle can be a two-wheeled vehicle, a three-wheeled vehicle, a four-wheeled vehicle or other multi-wheeled vehicles.

[0074] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present disclosure, and are not intended to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A shock absorption system, characterized in that, it includes: a shock absorber, the shock absorber includes a main cylinder block and a main piston mechanism, the main cylinder block has a main cylinder cavity; the main piston mechanism is arranged in the main cylinder cavity, the main piston mechanism divides the main cylinder cavity into a first main cavity and a second main cavity, the main piston mechanism is configured to be able to move along the axial direction of the main cylinder cavity; the main piston mechanism includes a main piston rod, the main piston rod has a first rod cavity; a first cavity hole is opened on the main piston rod, the first cavity hole is communicated with the first main cavity, and a pressurizing structure is formed between the main piston rod and the main cylinder cavity, the pressurizing structure is configured to be able to make the fluid flow unidirectionally towards the first rod cavity; an oil pressure switching mechanism, the oil pressure switching mechanism includes a high-pressure cylinder and a low-pressure cylinder, the high-pressure cylinder and the low-pressure cylinder are communicated with each other through a first pipeline, the high-pressure cylinder is provided with a third one-way valve for flowing from the first pipeline to the high-pressure cylinder, and the low-pressure cylinder is provided with a fourth one-way valve for flowing from the low-pressure cylinder to the first pipeline; the first pipeline is communicated with the first rod cavity, the third one-way valve includes a first valve housing, a first valve rod, a first valve piece and a first valve spring; a first side valve hole is opened on the side wall of the first valve housing, one end of the first valve rod is fixedly connected with the first valve piece, the first valve rod is inserted on the first valve housing, and the first valve rod can move relative to the first valve housing; one end of the first valve spring abuts against the first valve piece, and the other end of the first valve spring abuts against the bottom of the first valve housing; a first main valve hole is also opened on the first valve housing; the first valve piece is used to block the first main valve hole; when the pressure in the first pipeline is greater than the pressure in the high-pressure cylinder, the first valve piece moves downward, so that the first main valve hole and the first side valve hole are communicated; the fourth one-way valve includes a second valve housing, a second valve rod, a second valve piece and a second valve spring; a second top valve hole is opened on one surface of the second valve housing, and a second bottom valve hole is opened on the other surface opposite to the second valve housing; one end of the second valve rod is fixedly connected with the second valve piece, the second valve rod is inserted on the second valve housing, and the second valve rod can move relative to the second valve housing; one end of the second valve spring abuts against the second valve piece, and the other end of the second valve spring abuts against the outer top surface of the second valve housing; the second valve piece is used to block the second top valve hole; when the pressure in the low-pressure cylinder is greater than the pressure in the first pipeline, the second valve piece moves downward to communicate the second top valve hole and the second bottom valve hole; and an energy recovery mechanism, the shock absorber is communicated with the oil pressure switching mechanism, and the oil pressure switching mechanism is communicated with the energy recovery mechanism; the inlet end of the energy recovery mechanism is communicated with the high-pressure cylinder, and the outlet end of the energy recovery mechanism is communicated with the low-pressure cylinder.

2. The shock absorption system according to claim 1, characterized in that, The main piston mechanism further includes a secondary piston rod, which is installed in the first rod cavity and is configured to be able to move relative to the main piston rod.

3. The shock absorption system according to claim 2, wherein, a second cavity hole is further formed in the main piston rod, the first cavity hole is located above the second cavity hole, and the second cavity hole is communicated with the second main cavity; a secondary bottom piston is provided at the bottom end of the secondary piston rod, and the secondary bottom piston is configured to be able to move to the position of the second cavity hole so that the second main cavity and the first rod cavity can be disconnected at the second cavity hole.

4. The shock absorption system according to claim 1, wherein, the pressurizing structure includes a main bottom piston provided at the bottom end of the main piston rod, a first one-way valve provided on the main bottom piston, and a second one-way valve provided at the bottom of the main cylinder block; when the main piston rod moves along the axial direction of the main cylinder cavity, the first one-way valve and the second one-way valve can be alternately opened.

5. The shock absorption system according to claim 2, wherein, a secondary top piston is provided at the top of the secondary piston rod, and the secondary top piston is limited on the main piston rod so that the secondary top piston can move within a set range.

6. The shock absorption system according to claim 1 or 2, wherein, the energy recovery mechanism includes an inlet pipe, a constant pressure valve structure, an energy recovery device and an outlet pipe; one end of the inlet pipe is communicated with the high-pressure cylinder, the other end of the inlet pipe is communicated with the constant pressure valve structure, the constant pressure valve structure is communicated with the energy recovery device, the energy recovery device is also communicated with one end of the outlet pipe, and the other end of the outlet pipe is communicated with the low-pressure cylinder.

7. The shock absorption system according to claim 6, wherein, the constant pressure valve structure includes a constant pressure valve body, a first guide rod, a first nut, a compression spring, a third spring seat and a moving piston; one end of the first guide rod is fixedly connected with the moving piston, the first nut is threadedly connected with the first guide rod, one end of the compression spring abuts against the first nut, the other end of the compression spring abuts against the third spring seat, and the third spring seat is detachably fixed in the valve cavity of the constant pressure valve body; the first nut is located on one side of the third spring seat, and the moving piston is located on the other side opposite to the third spring seat; a high-pressure jet hole is formed on the peripheral wall of the outlet of the valve cavity of the constant pressure valve body; a third flow hole is formed on the third spring seat; and the moving piston can block the high-pressure jet hole.

8. A vehicle, wherein, comprising: a vehicle body, steerable wheels connected to the vehicle body, and a shock absorption system according to any one of claims 1-7; the main piston rod is connected to the vehicle body, and the main cylinder block is connected to the wheels, so that the main cylinder block can rotate relative to the main piston rod when the wheels turn.

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