An oil-gas separation type three-chamber zero-mid-throw automobile shock absorber

Abstract

The present invention relates to an oil-gas separation type three-chamber zero-backlash automobile shock absorber, comprising a cylinder, a piston rod is installed in the inner cavity, a lower plug assembly is installed at the bottom of the inner cavity, an upper plug assembly is installed at the connection between the piston rod and the cylinder, the end of the piston rod extending into one end of the inner cavity is installed with a piston assembly linked with the piston rod, a float assembly movable along the inner cavity is installed in the inner cavity, an air cavity is formed between the float assembly and the lower plug assembly, an inflation valve is installed in the air cavity, a second oil cavity is formed between the piston assembly and the float assembly, a first oil cavity is formed between the upper plug assembly and the piston assembly, the first oil cavity and the second oil cavity are filled with shock-absorbing oil, a sealing ring type two-way valve structure is arranged in the piston assembly, the sealing ring type two-way valve comprises a first oil-passing valve structure for causing the shock-absorbing oil to flow from the second cavity into the first cavity when the piston rod moves downward, and a second oil-passing valve structure for causing the shock-absorbing oil to flow from the first cavity into the second cavity when the piston rod moves upward.

Description

Technical Field

[0001] The invention relates to the field of automobile shock absorbers, and in particular to an oil-gas separation type three-cavity zero-free travel automobile shock absorber. Background Art

[0002] In order to quickly attenuate the vibration of the frame and body and improve the smoothness and comfort of the car's driving, shock absorbers are generally installed on the car suspension system. Double-acting cylinder shock absorbers are widely used in cars. Currently, cylinder-type car shock absorbers generate high heat, make high noise, are heavy, have a short service life, and cannot meet the car's demand for shock absorbers. Summary of the invention

[0003] The technical problem to be solved by the present invention is to address the deficiencies of the above-mentioned prior art.

[0004] The invention provides an oil-gas separation type three-chamber zero-mid-travel automobile shock absorber which has the advantages of simple structure, low heat generation, low noise, good shock absorption effect and long service life.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an oil-gas separation type three-chamber zero-backlash automobile shock absorber, comprising a cylinder, one end of the cylinder is provided with an open inner cavity and the other end is provided with a mounting ring, a piston rod is installed in the inner cavity, a lower plug assembly is installed at the bottom of the inner cavity, an upper plug assembly is installed at the connection between the piston rod and the cylinder, the end of the piston rod extending into one end of the inner cavity is provided with a piston assembly linked to the piston rod, a float assembly movable along the inner cavity is installed in the inner cavity, an air cavity is formed between the float assembly and the lower plug assembly, an inflation valve is installed in the air cavity, a second oil cavity is formed between the piston assembly and the float assembly, a first oil cavity is formed between the upper plug assembly and the piston assembly, the first oil cavity and the second oil cavity are filled with shock-absorbing oil, characterized in that: the upper plug assembly comprises There is an upper plug body, a gasket is connected to one end of the upper plug body away from the cylinder, an oil-containing bearing is arranged at the other end, an oil seal is arranged at the other end of the oil-containing bearing, the gasket and the upper plug body are connected by a first closing structure, the upper plug body and the cylinder are connected by a second closing structure, the lower plug assembly includes a mounting seat and a lower plug body mounted on the mounting seat, the lower plug body and the cylinder are connected by a third closing structure, the lower plug body and the mounting seat are connected by a fourth closing structure, a sealing ring type two-way valve structure is arranged in the piston assembly, the sealing ring type two-way valve includes a first oil-transmitting valve structure that causes the shock-absorbing oil to flow from the second cavity into the first cavity when the piston rod moves downward, and a second oil-transmitting valve structure that causes the shock-absorbing oil to flow from the first cavity into the second cavity when the piston rod moves upward.

[0006] By adopting the above technical scheme, the shock absorber can perform upward shock absorption and downward shock absorption. When the shock absorber performs upward shock absorption, the shock-absorbing oil enters the second oil chamber from the first oil chamber of the sealing ring type two-way valve arranged on the piston assembly through the first oil valve structure. At this time, the second oil valve structure is automatically closed, and the air chamber is automatically expanded to compensate for the volume difference between the first oil chamber and the second oil chamber. When the shock absorber performs downward shock absorption, the oil enters the first oil chamber from the second oil chamber through the second oil valve structure. The first oil valve structure is automatically closed, and the air chamber is automatically reduced to compensate for the volume difference between the first oil chamber and the second oil chamber. The gasket and the upper plug body are connected by a closing method to ensure that the oil seal will not fall out.

[0007] The above-mentioned oil-gas separation three-chamber zero-backlash automobile shock absorber can be further configured as follows: the piston assembly includes a piston body, the first oil-passing valve structure includes a first oil drain straight hole arranged in the piston body, one end of the first oil drain straight hole is connected to the first oil chamber, and a first limit seat with an outer diameter smaller than the inner diameter of the piston body is arranged at one end of the piston body close to the first oil chamber, a first V-shaped limit ring groove is arranged between the piston body and the first limit seat, the first V-shaped limit ring groove is provided with at least one group of first oil drain side holes connected to the first oil drain straight hole, and a hole with an outer diameter smaller than the inner diameter of the piston body is installed in the first V-shaped limit ring groove. A first sealing ring with a diameter larger than that of the first oil drain side hole, the second oil valve structure includes a second oil drain straight hole arranged in parallel with the first oil drain straight hole in the piston body, one end of the second oil drain straight hole is connected to the second oil chamber, a second limit seat with an outer diameter smaller than the inner diameter of the piston body is arranged at one end of the piston body close to the second oil chamber, a second V-shaped limit ring groove is arranged between the piston body and the second limit seat, the second V-shaped limit ring groove is provided with at least one group of second oil drain side holes connected to the second oil drain straight hole, and a second sealing ring with an outer diameter smaller than the inner diameter of the piston body and a diameter larger than the second oil drain side hole is installed in the second V-shaped limit ring groove.

[0008] By adopting the above technical scheme, the first oil chamber and the second oil chamber are connected through the piston body. When the fluid flows from the first oil chamber to the second oil chamber, it enters the piston body through the first oil drain straight hole, passes through the first oil drain side hole and then pushes open the first sealing ring to flow into the second oil chamber from the first oil drain side hole. When the fluid flows from the second oil chamber to the first oil chamber, it enters the piston body through the second oil drain straight hole, passes through the second oil drain side hole and then pushes open the second sealing ring to flow into the second oil chamber from the second oil drain side hole. Since sealing rings are arranged at both ends of the piston body, when the fluid in the first oil chamber enters the first oil drain straight hole, the fluid pressure in the first oil chamber presses the second sealing ring into the second V-shaped limit ring groove, so that the fluid cannot pass through the second oil drain straight hole from the second oil chamber and go out from the second oil drain side hole. Conversely, when the fluid enters the second oil chamber and goes out from the second oil drain side hole through the second oil drain straight hole, the fluid in the first oil chamber cannot enter the second oil chamber from the first oil drain side hole, which shows that the fluid can flow in one direction at the same time.

[0009] The above-mentioned oil-gas separation three-chamber zero-backlash automobile shock absorber can be further configured as follows: a sealing structure is arranged between the middle part of the piston body and the cylinder barrel, the sealing structure includes a mounting groove arranged in the middle part of the piston body, and a third sealing ring is installed in the mounting groove.

[0010] By adopting the above technical solution, a sealing ring is provided between the cylinder barrel and the piston body to prevent the shock absorbing oil from passing through the gap between the two and thus affecting the shock absorbing performance.

[0011] The above-mentioned oil-gas separation three-chamber zero-free travel automobile shock absorber can be further configured as follows: an air injection cavity is provided at one end of the lower plug body, an L-shaped air injection channel is opened at one end of the air injection cavity, and a one-way valve structure is provided at the other end of the air injection channel relative to the connected air cavity.

[0012] By adopting the above technical scheme, gas is injected from the air injection cavity into the air cavity. The gas can select different pressures according to needs to generate different shock absorption coefficients and produce different shock absorption effects. After the gas is injected from the air injection cavity into the air cavity, the air injection cavity is sealed with glue to form the first seal for the air cavity. After the gas enters the air cavity through the one-way valve structure, it cannot flow out of the air injection cavity again through the one-way valve structure. The one-way valve structure forms a second seal for the air cavity.

[0013] The above-mentioned oil-gas separation three-chamber zero-clearance automobile shock absorber can be further configured as: the one-way valve structure includes a third limit seat with a diameter smaller than the lower plug body, which is arranged at one end of the lower plug body away from the bottom of the cylinder inner cavity, and a third V-shaped limit ring groove is arranged between the third limit seat and the lower plug body, and a fourth sealing ring with an outer diameter smaller than the inner diameter of the lower plug body and a diameter larger than the inner diameter of the gas injection channel is installed in the third V-shaped limit ring groove.

[0014] By adopting the above technical solution, the outer diameter of the third limit seat is smaller than the outer diameter of the lower plug body, so a gap is formed between the third limit seat and the cylinder, which can fully allow the gas to flow from the injection chamber to the air chamber. When the air chamber is inflated from the injection chamber, the gas breaks through the fourth sealing ring through the injection channel and flows into the air chamber. When the inflation stops, the air pressure of the air chamber squeezes the fourth sealing ring, so that the fourth sealing ring blocks the inflation channel to form a seal.

[0015] The above-mentioned oil-gas separation three-chamber zero-backlash automobile shock absorber can be further configured as follows: a second sealing structure is arranged between the lower plug body and the cylinder barrel, the second sealing structure includes at least two second installation grooves arranged at intervals in the middle part of the lower plug body, and a fifth sealing ring is installed in the second installation groove.

[0016] By adopting the above technical solution, a fifth sealing ring is arranged on the float body to prevent air leakage between the float body and the cylinder.

[0017] The above-mentioned oil-gas separation three-chamber zero-free travel automobile shock absorber can be further configured as follows: the first oil drain straight hole and the second oil drain straight hole have different cross-sectional areas, and the second oil drain side hole and the second oil drain side hole have different cross-sectional areas.

[0018] By adopting the above technical solution, the cross-sectional areas of the first oil drain hole and the second oil drain hole are different, so that the flow rates of the fluid passing through the two directions per unit time are different. Therefore, the magnitude of the force during upward shock absorption and downward shock absorption is different, and the shock absorption effect is different.

[0019] The above-mentioned oil-gas separation three-chamber zero-free travel automobile shock absorber can be further configured as follows: the float assembly includes a float body, a sealing screw is arranged on the float body, and a sixth sealing ring and a second gasket are arranged below the sealing screw.

[0020] The above-mentioned oil-gas separation type three-chamber zero-mid-motion automobile shock absorber can be further configured as follows: the sealing screw is located at the center of the float body or eccentrically located on the float body.

[0021] By adopting the above technical solution, after the first oil chamber and the second oil chamber are filled with oil, a sealing screw is assembled in the float body, and then the float body is closed after the screw head of the sealing screw is closed to prevent the sealing screw from falling out. The sealing bolt can be located at the center of the float body or eccentrically located at other positions on the float body.

[0022] The beneficial effects of the present invention are as follows: 1. The oil chamber and the compensating air chamber of the shock absorber are separated from each other, the oil and gas are no longer mixed, and there is no lost motion caused by the oil and gas mixing; 2. The oil chamber and the compensating air chamber of the shock absorber are separated, the oil and gas are no longer mixed, no bubbles are generated, and there is no heating phenomenon caused thereby; 3. The oil chamber and the compensating air chamber of the shock absorber are separated, the oil and gas are no longer mixed, no bubbles are generated, and there is no noise caused thereby; 4. The structure is simple, and the shock absorber is changed from two layers of cylinder barrels to one cylinder barrel, which reduces the number of parts and the weight of the product; 5. The spring sheet combination composed of multiple parts in the traditional shock absorber is cancelled, and there is no problem of spring sheet damage, which increases the service life of the shock absorber; 6. The damping coefficient is adjustable: the pressure of the air chamber is filled in after the assembly is completed, and gases of different pressures can be injected according to product needs to produce different damping coefficients, thereby achieving the adjustment of the shock absorption effect.

[0023] The present invention is further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present invention.

[0025] Figure 2 It is a schematic diagram of the enlarged structure of the piston assembly according to an embodiment of the present invention.

[0026] Figure 3A schematic diagram of the enlarged structure of the lower plug assembly implemented in the present invention. DETAILED DESCRIPTION

[0027] See also Figure 1-Figure 3As shown: an oil-gas separation type three-chamber zero-mid-throw automobile shock absorber, including a cylinder 6, one end of the cylinder 6 is provided with an open inner cavity and the other end is provided with a mounting ring 16, a piston rod 7 is installed in the inner cavity, a lower plug assembly is installed at the bottom of the inner cavity, an upper plug assembly is installed at the connection between the piston rod 7 and the cylinder 6, the end of the piston rod 7 extending into the inner cavity is provided with a piston assembly linked with the piston rod 7, a float assembly movable along the inner cavity is installed in the inner cavity, an air cavity C is formed between the float assembly and the lower plug assembly, an inflation valve is installed in the air cavity C, a second oil cavity B is formed between the piston assembly and the float assembly, a first oil cavity A is formed between the upper plug assembly and the piston assembly, the first oil cavity A and the second oil cavity B are filled with shock-absorbing oil, and the upper plug assembly includes an upper plug body 3, an upper plug The end of the body 3 away from the cylinder 6 is connected with a gasket 2, and the other end is provided with an oil-containing bearing 4, and the other end of the oil-containing bearing 4 is provided with an oil seal 5, the gasket 2 and the upper plug body 3 are connected by a first closing structure, and the upper plug body 3 and the cylinder 6 are connected by a second closing structure, the lower plug assembly includes a mounting seat 15 and a lower plug body 14 mounted on the mounting seat 15, the lower plug body 14 and the cylinder 6 are connected by a third closing structure, and the lower plug body 14 and the mounting seat 15 are connected by a fourth closing structure, and a sealing ring type two-way valve structure is provided in the piston assembly, and the sealing ring type two-way valve includes a first oil-passing valve structure that causes the shock-absorbing oil to flow from the second cavity B into the first cavity A when the piston rod 7 moves downward, and a second oil-passing valve structure that causes the shock-absorbing oil to flow from the second cavity B into the first cavity A when the piston rod 7 moves upward. The second oil-passing valve structure in which the first cavity A flows into the second cavity B, the piston assembly includes a piston body 9, the first oil-passing valve structure includes a first oil-draining straight hole 22 arranged in the piston body 9, one end of the first oil-draining straight hole 22 is connected to the first oil cavity A, the end of the piston body 9 close to the first oil cavity A is provided with a first limiting seat 91 with an outer diameter smaller than the inner diameter of the piston body 9, a first V-shaped limiting ring groove 92 is provided between the piston body 9 and the first limiting seat 91, the first V-shaped limiting ring groove 92 is provided with a group of first oil-draining side holes 21 connected to the first oil-draining straight hole 22, a first sealing ring 93 with an outer diameter smaller than the inner diameter of the piston body 9 and a diameter larger than the first oil-draining side hole 21 is installed in the first V-shaped limiting ring groove, the second oil-passing valve structure includes a first oil-draining straight hole 22 arranged in the piston body 9, and a first oil-draining straight hole 22 is connected to the first oil cavity A. A second oil drain hole 20 is arranged parallel to the oil drain hole 22, one end of the second oil drain hole 20 is connected to the second oil chamber B, a second limit seat 94 with an outer diameter smaller than the inner diameter of the piston body 9 is arranged at one end of the piston body 9 close to the second oil chamber B, a second V-shaped limit ring groove 95 is arranged between the piston body 9 and the second limit seat 94, the second V-shaped limit ring groove 95 is provided with a group of second oil drain side holes 8 connected to the second oil drain hole 20, a second sealing ring 96 with an outer diameter smaller than the inner diameter of the piston body 9 and a diameter larger than the second oil drain side hole 8 is installed in the second V-shaped limit ring groove 95, a sealing structure is arranged between the middle part of the piston body 9 and the cylinder 6, the sealing structure includes a mounting groove 97 arranged in the middle part of the piston body 9, and a third sealing ring 98 is installed in the mounting groove 97,An air injection cavity D is provided at one end of the lower plug body 14, an L-shaped air injection channel 18 is opened at one end of the air injection cavity D, and a one-way valve structure is provided at the other end of the air injection channel 18 relative to the air cavity C. The one-way valve structure includes a third limit seat 141 with a diameter smaller than that of the lower plug body 14, which is provided at one end of the lower plug body 14 away from the bottom of the inner cavity of the cylinder 6, and a third V-shaped limit ring groove 142 is provided between the third limit seat 141 and the lower plug body 14, and a fourth sealing ring 17 with an outer diameter smaller than the inner diameter of the lower plug body 14 and a diameter larger than the inner diameter of the air injection channel 18 is installed in the third V-shaped limit ring groove 142. A second sealing structure is provided between the head body 14 and the cylinder 6. The second sealing structure includes two second installation grooves 143 arranged at intervals in the middle of the lower plug body 14. A fifth sealing ring 144 is installed in the second installation groove 143. The first oil drain straight hole 22 and the second oil drain straight hole 20 have different cross-sectional areas. The second oil drain side hole 8 and the first oil drain side hole 21 have different cross-sectional areas. The float assembly includes a float body 12. A sealing screw 11 is provided on the float body 12. A sixth sealing ring 19 and a second gasket are provided below the sealing screw 11. The sealing screw 11 is located at the center of the float body 12.

Claims

1. An oil-gas separation three-chamber zero-backlash automobile shock absorber, comprising a cylinder, one end of the cylinder is provided with an open inner cavity and the other end is provided with a mounting ring, a piston rod is installed in the inner cavity, a lower plug assembly is installed at the bottom of the inner cavity, an upper plug assembly is installed at the connection between the piston rod and the cylinder, the end of the piston rod extending into one end of the inner cavity is provided with a piston assembly linked with the piston rod, a float assembly movable along the inner cavity is installed in the inner cavity, an air cavity is formed between the float assembly and the lower plug assembly, an inflation valve is installed in the air cavity, a second oil cavity is formed between the piston assembly and the float assembly, a first oil cavity is formed between the upper plug assembly and the piston assembly, the first oil cavity and the second oil cavity are filled with shock-absorbing oil, characterized in that: The upper plug assembly includes an upper plug body, one end of the upper plug body away from the cylinder is connected to a gasket, the other end is provided with an oil-containing bearing, the other end of the oil-containing bearing is provided with an oil seal, the gasket and the upper plug body are connected by a first closing structure, the upper plug body and the cylinder are connected by a second closing structure, the lower plug assembly includes a mounting seat and a lower plug body mounted on the mounting seat, one end of the lower plug body is provided with an injection cavity, one end of the injection cavity is provided with an L-shaped injection channel, the other end of the injection channel relative to the connected gas cavity is provided with a one-way valve structure, the one-way valve structure includes a lower plug body at one end away from the bottom of the cylinder inner cavity is provided A third limiting seat with a diameter smaller than that of the lower plug body is provided, a third V-shaped limiting ring groove is provided between the third limiting seat and the lower plug body, a fourth sealing ring with an outer diameter smaller than the inner diameter of the lower plug body and a diameter larger than the inner diameter of the gas injection channel is installed in the third V-shaped limiting ring groove, the lower plug body and the cylinder barrel are connected by a third closing structure, the lower plug body and the mounting seat are connected by a fourth closing structure, a sealing ring type two-way valve structure is provided in the piston assembly, and the sealing ring type two-way valve includes a first oil-passing valve structure that causes the shock-absorbing oil to flow from the second cavity into the first cavity when the piston rod descends, and a first oil-passing valve structure that causes the shock-absorbing oil to flow from the first cavity into the first cavity when the piston rod ascends. A second oil-passing valve structure entering the second cavity, the piston assembly includes a piston body, the first oil-passing valve structure includes a first oil-draining straight hole set in the piston body, one end of the first oil-draining straight hole is connected to the first oil cavity, a first limit seat with an outer diameter smaller than the inner diameter of the piston body is set at one end of the piston body close to the first oil cavity, a first V-shaped limit ring groove is set between the piston body and the first limit seat, the first V-shaped limit ring groove is provided with at least one group of first oil-draining side holes connected to the first oil-draining straight hole, a first sealing ring with an outer diameter smaller than the inner diameter of the piston body and a diameter larger than the first oil-draining side hole is installed in the first V-shaped limit ring groove, the second oil-passing valve structure includes the piston body A second oil drain hole is arranged in the body in parallel with the first oil drain hole, one end of the second oil drain hole is connected with the second oil chamber, a second limit seat with an outer diameter smaller than the inner diameter of the piston body is arranged at one end of the piston body close to the second oil chamber, a second V-shaped limit ring groove is arranged between the piston body and the second limit seat, the second V-shaped limit ring groove is provided with at least one group of second oil drain side holes connected with the second oil drain hole, a second sealing ring with an outer diameter smaller than the inner diameter of the piston body and a diameter larger than the second oil drain side hole is installed in the second V-shaped limit ring groove, the float assembly includes a float body, a sealing screw is arranged on the float body, and a sixth sealing ring and a second gasket are arranged below the sealing screw.

2. The oil-gas separation three-chamber zero-mid-throw automobile shock absorber according to claim 1 is characterized in that: A sealing structure is arranged between the middle part of the piston body and the cylinder barrel. The sealing structure comprises a mounting groove arranged in the middle part of the piston body. A third sealing ring is installed in the mounting groove.

3. The oil-gas separation three-chamber zero-mid-throw automobile shock absorber according to claim 2 is characterized in that: A second sealing structure is provided between the lower plug body and the cylinder barrel, and the second sealing structure comprises at least two second installation grooves arranged at intervals in the middle of the lower plug body, and a fifth sealing ring is installed in the second installation groove.

4. The oil-gas separation type three-chamber zero-mid-throw automobile shock absorber according to claim 3 is characterized in that: The first oil drain straight hole and the second oil drain straight hole have different cross-sectional areas, and the second oil drain side hole and the first oil drain side hole have different cross-sectional areas.

5. The oil-gas separation type three-chamber zero-mid-throw automobile shock absorber according to claim 4 is characterized in that: The sealing screw is located at the center of the float body or eccentrically on the float body.

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