CN111422019A - Hydro-pneumatic suspension system and engineering machinery - Google Patents
Hydro-pneumatic suspension system and engineering machinery Download PDFInfo
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- CN111422019A CN111422019A CN202010309491.3A CN202010309491A CN111422019A CN 111422019 A CN111422019 A CN 111422019A CN 202010309491 A CN202010309491 A CN 202010309491A CN 111422019 A CN111422019 A CN 111422019A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/06—Characteristics of dampers, e.g. mechanical dampers
- B60G17/08—Characteristics of fluid dampers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2300/00—Indexing codes relating to the type of vehicle
- B60G2300/09—Construction vehicles, e.g. graders, excavators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
- B60G2800/16—Running
- B60G2800/162—Reducing road induced vibrations
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Abstract
The invention discloses an oil-gas suspension system and engineering machinery, and relates to the technical field of engineering machinery. The oil-gas suspension system comprises a first suspension oil way and a second suspension oil way, wherein a first suspension oil cylinder, a first control valve and a first energy accumulator are arranged on the first suspension oil way, a second suspension oil cylinder, a second control valve and a second energy accumulator are arranged on the second suspension oil way, the first energy accumulator is connected with a rod cavity of the second suspension oil cylinder and is connected with a rodless cavity of the first suspension oil cylinder through the first control valve, and the second energy accumulator is connected with a rod cavity of the first suspension oil cylinder and is connected with a rodless cavity of the second suspension oil cylinder through the second control valve. The hydro-pneumatic suspension system provided by the invention has a better pressure maintaining effect, and can greatly improve the performance of engineering machinery.
Description
Technical Field
The invention relates to the technical field of engineering machinery, in particular to an oil-gas suspension system and engineering machinery.
Background
The hydro-pneumatic suspension system plays an important role in the driving shock absorption and the balance of a vehicle body of the engineering machinery.
At present, the pressure maintaining effect of a suspension oil cylinder in an oil-gas suspension system configured in engineering machinery on the market is poor, so that the driving damping effect is extremely limited, and the balance state of a vehicle body is difficult to maintain for a long time in a working state.
Disclosure of Invention
The invention aims to provide an oil-gas suspension system which can improve the pressure maintaining effect of a suspension oil cylinder.
Another object of the present invention is to provide an engineering machine, which can improve the pressure maintaining effect of a suspension cylinder.
The invention provides a technical scheme that:
the oil-gas suspension system comprises a first suspension oil way and a second suspension oil way, wherein a first suspension oil cylinder, a first control valve and a first energy accumulator are arranged on the first suspension oil way, a second suspension oil cylinder, a second control valve and a second energy accumulator are arranged on the second suspension oil way, the first energy accumulator is connected with a rod cavity of the second suspension oil cylinder and is connected with a rodless cavity of the first suspension oil cylinder through the first control valve, and the second energy accumulator is connected with a rod cavity of the first suspension oil cylinder and is connected with a rodless cavity of the second suspension oil cylinder through the second control valve.
Further, the first control valve is an electromagnetic ball valve, and when the first control valve is electrified, the first energy accumulator is communicated with the rodless cavity of the first suspension oil cylinder;
when the first control valve is powered off, the first energy accumulator is not communicated with the rodless cavity of the first suspension oil cylinder.
Further, the second control valve is an electromagnetic ball valve, and when the second control valve is electrified, the second energy accumulator is communicated with the rodless cavity of the second suspension oil cylinder;
when the second control valve is powered off, the second energy accumulator is not communicated with the rodless cavity of the second suspension oil cylinder.
Furthermore, the oil-gas suspension system further comprises an oil inlet pipeline and an oil return pipeline, the oil inlet pipeline is connected with the first suspension oil way and the second suspension oil way respectively, and the oil return pipeline is connected with the first suspension oil way and the second suspension oil way respectively.
Furthermore, a first reversing valve, a first hydraulic control one-way valve and a second hydraulic control one-way valve are further arranged on the first suspension oil path, the first reversing valve is respectively connected with the oil inlet pipeline, the oil return pipeline, the input end of the first hydraulic control one-way valve and the input end of the second hydraulic control one-way valve, the output end of the first hydraulic control one-way valve is connected with a pipeline of the second energy accumulator, which is connected with the rod cavity of the first suspension oil cylinder, and the output end of the second hydraulic control one-way valve is connected with a pipeline of the first control valve, which is connected with the rodless cavity of the first suspension oil cylinder.
Further, when the first reversing valve is located at a first working position, the oil return pipeline is communicated with the first hydraulic control one-way valve and the second hydraulic control one-way valve, and the oil inlet pipeline is not communicated with the first hydraulic control one-way valve and the second hydraulic control one-way valve; when the first reversing valve is located at a second working position, the oil inlet pipeline is only communicated with the second hydraulic control one-way valve, and the oil return pipeline is only communicated with the first hydraulic control one-way valve; when the first reversing valve is located at a third working position, the oil inlet pipeline is only communicated with the first hydraulic control one-way valve, and the oil return pipeline is only communicated with the second hydraulic control one-way valve.
Further, a second reversing valve, a third hydraulic control one-way valve and a fourth hydraulic control one-way valve are further arranged on the second suspension oil path, the second reversing valve is respectively connected with the oil inlet pipeline, the oil return pipeline, the input end of the third hydraulic control one-way valve and the input end of the fourth hydraulic control one-way valve, the output end of the third hydraulic control one-way valve is connected with a pipeline of the first energy accumulator connected with the rod cavity of the second suspension oil cylinder, and the output end of the fourth hydraulic control one-way valve is connected with a pipeline of the second control valve connected with the rodless cavity of the second suspension oil cylinder.
Further, when the second reversing valve is located at the first working position, the oil return pipeline is communicated with the third hydraulic control one-way valve and the fourth hydraulic control one-way valve, and the oil inlet pipeline is not communicated with the third hydraulic control one-way valve and the fourth hydraulic control one-way valve; when the second reversing valve is located at a second working position, the oil inlet pipeline is only communicated with the third hydraulic control one-way valve, and the oil return pipeline is only communicated with the fourth hydraulic control one-way valve; when the second reversing valve is located at a third working position, the oil inlet pipeline is only communicated with the fourth hydraulic control one-way valve, and the oil return pipeline is only communicated with the third hydraulic control one-way valve.
Further, the oil-gas suspension system further comprises an oil tank, and the oil return pipeline is connected with the oil tank.
The invention also provides engineering machinery comprising the oil-gas suspension system, wherein the oil-gas suspension system comprises a first suspension oil way and a second suspension oil way, a first suspension oil cylinder, a first control valve and a first energy accumulator are arranged on the first suspension oil way, a second suspension oil cylinder, a second control valve and a second energy accumulator are arranged on the second suspension oil way, the first energy accumulator is connected with the rod cavity of the second suspension oil cylinder and is connected with the rodless cavity of the first suspension oil cylinder through the first control valve, and the second energy accumulator is connected with the rod cavity of the first suspension oil cylinder and is connected with the rodless cavity of the second suspension oil cylinder through the second control valve.
Compared with the prior art, the oil-gas suspension system provided by the invention has the advantages that the first energy accumulator is connected with the rod cavity of the second suspension oil cylinder and is connected with the rodless cavity of the first suspension oil cylinder through the first control valve, the second energy accumulator is connected with the rod cavity of the first suspension oil cylinder and is connected with the rodless cavity of the second suspension oil cylinder through the second control valve, the first energy accumulator plays an auxiliary pressure maintaining role on the second suspension oil cylinder, and the second energy accumulator plays an auxiliary pressure maintaining role on the first suspension oil cylinder. In practical application, the pressure maintaining effect of the first suspension oil cylinder and the second suspension oil cylinder is better, the driving damping effect of the engineering machinery is greatly improved, and the engineering machinery can be kept in a balanced state for a longer time in a working state without heeling. Therefore, the beneficial effects of the hydro-pneumatic suspension system provided by the invention comprise that: the pressure maintaining effect is better, and the performance of the engineering machinery can be greatly improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. For a person skilled in the art, it is possible to derive other relevant figures from these figures without inventive effort.
Fig. 1 is a schematic structural diagram of a hydro-pneumatic suspension system according to a first embodiment of the present invention.
Icon: 100-hydro-pneumatic suspension system; 110-a first suspension oil path; 111-a first suspension cylinder; 112-a first control valve; 113-a first energy storage; 114-a first direction valve; 115-a first pilot operated check valve; 116-a second hydraulically controlled check valve; 130-a second suspension oil path; 131-a second suspension cylinder; 132-a second control valve; 133-a second accumulator; 134-a second reversing valve; 135-a third pilot operated check valve; 136-fourth pilot operated check valve; 150-oil inlet pipeline; 170-return line; 190-oil tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is also to be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following detailed description of embodiments of the invention refers to the accompanying drawings.
First embodiment
Referring to fig. 1, the hydro-pneumatic suspension system 100 provided in this embodiment is applied to an engineering machine, and plays a role in damping a driving process of the engineering machine, and maintains a balance of a vehicle body in a working state of the engineering machine, thereby ensuring smooth operation of the engineering machine. This hydro-pneumatic suspension system 100 has better pressurize effect, can promote engineering machine's performance by a wide margin.
The hydro-pneumatic suspension system 100 of the present embodiment includes a first suspension oil path 110, a second suspension oil path 130, an oil inlet line 150, an oil return line 170, and an oil tank 190. The first suspension oil path 110 and the second suspension oil path 130 are connected in parallel between the oil inlet pipeline 150 and the oil return pipeline 170, the oil tank 190 is connected to the oil return pipeline 170, the oil inlet pipeline 150 is used for providing hydraulic oil for the first suspension oil path 110 and the second suspension oil path 130, and the oil return pipeline 170 is used for guiding the hydraulic oil in the first suspension oil path 110 and the second suspension oil path 130 to the oil return tank 190.
The first suspension oil path 110 is provided with a first suspension cylinder 111, a first control valve 112, a first accumulator 113, a first direction switching valve 114, a first pilot operated check valve 115, and a second pilot operated check valve 116. The second suspension oil passage 130 is provided with a second suspension cylinder 131, a second control valve 132, a second accumulator 133, a second direction switching valve 134, a third pilot operated check valve 135, and a fourth pilot operated check valve 136. It should be noted that the number of the first suspension cylinders 111 disposed on the first suspension oil path 110 and the number of the second suspension cylinders 131 disposed on the second suspension oil path 130 are adaptively adjusted according to the actual application requirements.
The first energy accumulator 113 is connected with a rod cavity of the second suspension cylinder 131 and is connected with a rodless cavity of the first suspension cylinder 111 through the first control valve 112, that is, the first energy accumulator 113 realizes continuous auxiliary pressure maintaining on the second suspension cylinder 131, and realizes selective pressure maintaining on the first suspension cylinder 111 by controlling the working position switching of the first control valve 112. The second energy accumulator 133 is connected to the rod chamber of the first suspension cylinder 111 and connected to the rodless chamber of the second suspension cylinder 131 through the second control valve 132, that is, the second energy accumulator 133 realizes continuous auxiliary pressure maintaining for the first suspension cylinder 111, and realizes selective pressure maintaining for the second suspension cylinder 131 by controlling the working position switching of the second control valve 132.
In this embodiment, the first control valve 112 and the second control valve 132 are both electromagnetic ball valves. When the first control valve 112 is powered on, the first energy accumulator 113 is communicated with the rodless cavity of the first suspension cylinder 111 through the internal channel of the first control valve 112 to play a pressure maintaining role for the first suspension cylinder 111, when the first control valve 112 is powered off, the internal channel of the first control valve 112 is disconnected, and the first energy accumulator 113 is not communicated with the rodless cavity of the first control valve 112. Similarly, when the second control valve 132 is powered on, the second accumulator 133 is communicated with the rodless cavity of the second suspension cylinder 131 through the internal passage of the second control valve 132 to perform a pressure maintaining function on the second suspension cylinder 131, when the second control valve 132 is powered off, the internal passage of the second control valve 132 is disconnected, and the second accumulator 133 is not communicated with the rodless cavity of the second control valve 132.
In this embodiment, the first direction valve 114 and the second direction valve 134 are three-position four-way valves, the valve body is provided with a plurality of ports, the first direction valve 114 is connected to the oil inlet pipeline 150, the oil return pipeline 170, the input end of the first pilot-controlled one-way valve 115 and the input end of the second pilot-controlled one-way valve 116 through the plurality of ports on the valve body, and the second direction valve 134 is connected to the oil inlet pipeline 150, the oil return pipeline 170, the input end of the third pilot-controlled one-way valve 135 and the input end of the fourth pilot-controlled one-way valve 136 through the plurality of ports on the valve body.
It should be noted that, in this embodiment, the first pilot check valve 115 and the second pilot check valve 116 are integrated into one pilot check valve set, and the third pilot check valve 135 and the fourth pilot check valve 136 are integrated into another pilot check valve set.
The output end of the first pilot check valve 115 is connected with the pipeline of the second accumulator 133 connected with the rod cavity of the first suspension cylinder 111, and the output end of the second pilot check valve 116 is connected with the pipeline of the first control valve 112 connected with the rodless cavity of the first suspension cylinder 111.
When the first reversing valve 114 is at the first working position, the oil return pipeline 170 is communicated with the first hydraulic control one-way valve 115 and the second hydraulic control one-way valve 116, and the oil inlet pipeline 150 is not communicated with the first hydraulic control one-way valve 115 and the second hydraulic control one-way valve 116; when the first reversing valve 114 is at the second working position, the oil inlet pipeline 150 is only communicated with the second hydraulic control one-way valve 116, and the oil return pipeline 170 is only communicated with the first hydraulic control one-way valve 115; when the first direction valve 114 is at the third working position, the oil inlet line 150 is connected to the first pilot operated check valve 115 only, and the oil return line 170 is connected to the second pilot operated check valve 116 only.
The output end of the third pilot-controlled check valve 135 is connected with the pipeline of the first accumulator 113 connected with the rod cavity of the second suspension cylinder 131, and the output end of the fourth pilot-controlled check valve 136 is connected with the pipeline of the second control valve 132 connected with the rodless cavity of the second suspension cylinder 131.
When the second reversing valve 134 is at the first working position, the oil return pipeline 170 is communicated with the third pilot-controlled one-way valve 135 and the fourth pilot-controlled one-way valve 136, and the oil inlet pipeline 150 is not communicated with the third pilot-controlled one-way valve 135 and the fourth pilot-controlled one-way valve 136; when the first reversing valve 114 is at the second working position, the oil inlet pipeline 150 is only communicated with the third pilot-controlled one-way valve 135, and the oil return pipeline 170 is only communicated with the fourth pilot-controlled one-way valve 136; when the second direction valve 134 is at the third working position, the oil inlet line 150 is connected to the fourth pilot-controlled check valve 136 only, and the oil return line 170 is connected to the third pilot-controlled check valve 135 only.
In practical application, when the first direction valve 114 is switched from the first operating position to the second operating position, the hydraulic oil input from the oil inlet pipeline 150 flows into the rodless cavity of the first suspension cylinder 111 through the second hydraulic control one-way valve 116, the oil pressure in the rod cavity of the first suspension cylinder 111 increases, the first hydraulic control one-way valve 115 is opened under the action of the control oil path to guide the hydraulic oil in the rod cavity of the first suspension cylinder 111 to flow into the oil return pipeline 170, oil return is realized, and the first suspension cylinder 111 rises in the process. When the first direction valve 114 is switched from the first working position to the third working position, the hydraulic oil input from the oil inlet pipeline 150 flows into the rod cavity of the first suspension cylinder 111 through the first hydraulic control one-way valve 115, the oil pressure in the rodless cavity of the first suspension cylinder 111 is increased, the second hydraulic control one-way valve 116 is opened under the action of the control oil way, the hydraulic oil in the rodless cavity of the first suspension cylinder 111 is guided to flow into the oil return pipeline 170, oil return is realized, and the first suspension cylinder 111 descends in the process.
When the second directional valve 134 is switched from the first operating position to the second operating position, the hydraulic oil input from the oil inlet pipeline 150 flows into the rod cavity of the second suspension cylinder 131 through the third hydraulic control one-way valve 135, the oil pressure in the rodless cavity of the second suspension cylinder 131 is increased, the fourth hydraulic control one-way valve 136 is opened under the action of the control oil way, the hydraulic oil in the rodless cavity of the second suspension cylinder 131 is guided to flow into the oil return pipeline 170, oil return is achieved, and the second suspension cylinder 131 descends in the process. When the second directional valve 134 is switched from the first operating position to the third operating position, the hydraulic oil input from the oil inlet pipeline 150 flows into the rodless cavity of the second suspension cylinder 131 through the fourth hydraulic control one-way valve 136, the oil pressure in the rod cavity of the second suspension cylinder 131 increases, the third hydraulic control one-way valve 135 is opened under the action of the control oil path, the hydraulic oil in the rod cavity of the second suspension cylinder 131 is guided to flow into the oil return pipeline 170, oil return is realized, and the second suspension cylinder 131 rises in the process.
In the existing hydro-pneumatic suspension system 100, the suspension cylinder can only descend depending on the self weight of the vehicle body, and active control cannot be performed, but the hydro-pneumatic suspension system 100 provided by the embodiment realizes active control on the descending process of the first suspension cylinder 111 and the second suspension cylinder 131, and greatly improves the reaction speed.
When the first direction valve 114 and the second direction valve 134 are respectively positioned at the first working position, and the first control valve 112 and the second control valve 132 are respectively electrified, the first accumulator 113 is communicated with the rodless cavity of the first suspension cylinder 111 and the rod cavity of the second suspension cylinder 131, and the second accumulator 133 is communicated with the rodless cavity of the second suspension cylinder 131 and the rod cavity of the first suspension cylinder 111. At this time, the first hydraulic control check valve 115 and the second hydraulic control check valve 116 cooperate to maintain pressure of the first suspension cylinder 111, so that hydraulic oil in the first suspension cylinder 111 is prevented from leaking; the third hydraulic control check valve 135 and the fourth hydraulic control check valve 136 cooperate to maintain pressure of the second suspension cylinder 131, so that hydraulic oil in the second suspension cylinder 131 is prevented from leaking, and the first energy accumulator 113 and the second energy accumulator 133 play a role in assisting in maintaining pressure of the first suspension cylinder 111 and the second cylinder. This process corresponds to engineering machine's driving process for engineering machine tool driving process's automobile body shock attenuation effect obtains promoting greatly.
When the first direction valve 114 and the second direction valve 134 are in the first working position respectively, and the first control valve 112 and the second control valve 132 are de-energized respectively, the first accumulator 113 is only communicated with the rod chamber of the second suspension cylinder 131, and the second accumulator 133 is only communicated with the rod chamber of the first suspension cylinder 111. Similarly, at this time, the first hydraulic control check valve 115 cooperates with the second hydraulic control check valve 116 to maintain pressure of the first suspension cylinder 111, so as to prevent hydraulic oil in the first suspension cylinder 111 from leaking; the third pilot operated check valve 135 and the fourth pilot operated check valve 136 cooperate to maintain pressure of the second suspension cylinder 131, thereby preventing leakage of hydraulic oil in the second suspension cylinder 131. The first energy accumulator 113 is used for independently maintaining the pressure of the second suspension oil cylinder 131, the second energy accumulator 133 is used for independently maintaining the pressure of the first suspension oil cylinder 111, and the pressure maintaining effect is stronger. The process corresponds to the operation process of the engineering machinery, so that the engineering machinery can keep the balance of the vehicle body for a long time in the operation process, does not incline, and ensures the smooth construction.
In summary, in the hydro-pneumatic suspension system 100 provided in this embodiment, through the switching of the working positions of the first direction valve 114 and the second direction valve 134 and the power-off control of the first control valve 112 and the second control valve 132, the respective descending active control of the first suspension cylinder 111 and the second suspension cylinder 131 is realized, the reaction speed is greatly increased, and the multi-form auxiliary pressure maintaining of the first suspension cylinder 111 and the second suspension cylinder 131 is performed through the first energy accumulator 113 and the second energy accumulator 133, so that the pressure maintaining requirements of the engineering machine in different application environments are met, and the performance of the engineering machine is greatly improved. In addition, the hydro-pneumatic suspension system 100 has fewer control elements, lower failure rate and higher stability.
Second embodiment
The embodiment provides an engineering machine, including the hydro-pneumatic suspension system 100 that the first embodiment provided, this hydro-pneumatic suspension system 100 has realized the initiative control to the respective decline of first suspension hydro-cylinder 111 and second suspension hydro-cylinder 131 through the work position switching of first switching valve 114, second switching valve 134, and gain or loss control of first control valve 112 and second control valve 132, has promoted reaction rate greatly, and through the supplementary pressurize of the multiform of first accumulator 113 and second accumulator 133 to first suspension hydro-cylinder 111 and second suspension hydro-cylinder 131, satisfied the pressurize requirement of engineering machine under different application environment, promoted the performance of engineering machine by a wide margin. Therefore, the engineering machinery that this embodiment provided has better pressurize effect, and the driving shock attenuation effect is better, and can keep the balanced not bank of automobile body of longer time under the operating condition.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The oil-gas suspension system is characterized by comprising a first suspension oil way and a second suspension oil way, wherein the first suspension oil way is provided with a first suspension oil cylinder, a first control valve and a first energy accumulator, the second suspension oil way is provided with a second suspension oil cylinder, a second control valve and a second energy accumulator, the first energy accumulator is connected with a rod cavity of the second suspension oil cylinder and is connected with a rodless cavity of the first suspension oil cylinder through the first control valve, and the second energy accumulator is connected with a rod cavity of the first suspension oil cylinder and is connected with a rodless cavity of the second suspension oil cylinder through the second control valve.
2. The hydro-pneumatic suspension system of claim 1, wherein the first control valve is a solenoid ball valve, the first accumulator being in communication with the rodless chamber of the first suspension cylinder when the first control valve is energized;
when the first control valve is powered off, the first energy accumulator is not communicated with the rodless cavity of the first suspension oil cylinder.
3. The hydro-pneumatic suspension system of claim 1, wherein the second control valve is a solenoid ball valve, the second accumulator being in communication with the rodless chamber of the second suspension cylinder when the second control valve is energized;
when the second control valve is powered off, the second energy accumulator is not communicated with the rodless cavity of the second suspension oil cylinder.
4. The hydro-pneumatic suspension system of any one of claims 1-3, further comprising an oil inlet line and an oil return line, the oil inlet line being connected to the first suspension oil passage and the second suspension oil passage, respectively, and the oil return line being connected to the first suspension oil passage and the second suspension oil passage, respectively.
5. The hydro-pneumatic suspension system as defined in claim 4, wherein the first suspension oil path is further provided with a first directional valve, a first hydraulic control one-way valve and a second hydraulic control one-way valve, the first directional valve is respectively connected with the oil inlet pipeline, the oil return pipeline, an input end of the first hydraulic control one-way valve and an input end of the second hydraulic control one-way valve, an output end of the first hydraulic control one-way valve is connected with the second accumulator through a pipeline connecting the rod cavity of the first suspension oil cylinder, and an output end of the second hydraulic control one-way valve is connected with a pipeline connecting the first control valve with the rod cavity of the first suspension oil cylinder.
6. The hydro-pneumatic suspension system of claim 5, wherein when the first directional valve is in a first operating position, the oil return line is in communication with the first hydraulic control one-way valve and the second hydraulic control one-way valve, and the oil inlet line is not in communication with both the first hydraulic control one-way valve and the second hydraulic control one-way valve; when the first reversing valve is located at a second working position, the oil inlet pipeline is only communicated with the second hydraulic control one-way valve, and the oil return pipeline is only communicated with the first hydraulic control one-way valve; when the first reversing valve is located at a third working position, the oil inlet pipeline is only communicated with the first hydraulic control one-way valve, and the oil return pipeline is only communicated with the second hydraulic control one-way valve.
7. The hydro-pneumatic suspension system as defined in claim 4, wherein a second directional valve, a third pilot operated check valve and a fourth pilot operated check valve are further disposed on the second suspension oil path, the second directional valve is connected to the oil inlet line, the oil return line, an input end of the third pilot operated check valve and an input end of the fourth pilot operated check valve respectively, an output end of the third pilot operated check valve is connected to a line connecting the first accumulator to the rod chamber of the second suspension oil cylinder, and an output end of the fourth pilot operated check valve is connected to a line connecting the second control valve to the rodless chamber of the second suspension oil cylinder.
8. The hydro-pneumatic suspension system of claim 7, wherein when the second directional valve is in the first operating position, the oil return line is in communication with the third pilot operated check valve and the fourth pilot operated check valve, and the oil inlet line is not in communication with the third pilot operated check valve and the fourth pilot operated check valve; when the second reversing valve is located at a second working position, the oil inlet pipeline is only communicated with the third hydraulic control one-way valve, and the oil return pipeline is only communicated with the fourth hydraulic control one-way valve; when the second reversing valve is located at a third working position, the oil inlet pipeline is only communicated with the fourth hydraulic control one-way valve, and the oil return pipeline is only communicated with the third hydraulic control one-way valve.
9. The hydro-pneumatic suspension system of claim 4, further comprising a tank, wherein the return line is connected to the tank.
10. A work machine comprising an hydro-pneumatic suspension system as defined in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010309491.3A CN111422019A (en) | 2020-04-17 | 2020-04-17 | Hydro-pneumatic suspension system and engineering machinery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010309491.3A CN111422019A (en) | 2020-04-17 | 2020-04-17 | Hydro-pneumatic suspension system and engineering machinery |
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| CN111422019A true CN111422019A (en) | 2020-07-17 |
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| CN109808435A (en) * | 2019-03-19 | 2019-05-28 | 徐工集团工程机械股份有限公司科技分公司 | Suspension system and vehicle |
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Application publication date: 20200717 |
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