CN213981438U - Double-acting hydraulic oil cylinder with novel structure - Google Patents
Double-acting hydraulic oil cylinder with novel structure Download PDFInfo
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- CN213981438U CN213981438U CN202022890578.2U CN202022890578U CN213981438U CN 213981438 U CN213981438 U CN 213981438U CN 202022890578 U CN202022890578 U CN 202022890578U CN 213981438 U CN213981438 U CN 213981438U
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Abstract
The utility model discloses a double-acting hydraulic oil cylinder with a novel structure, which belongs to the field of hydraulic oil cylinders and comprises a cylinder barrel, an outer piston rod and an inner piston rod which are arranged from outside to inside in sequence; the cylinder barrel is provided with an oil receiving port A and an oil receiving port B; the front end of the outer piston rod extends out of the cylinder barrel, the rear end of the outer piston rod is provided with an outer piston in sliding fit with the inner diameter surface of the cylinder barrel, an outer oil storage cavity is formed between the outer piston rod and the cylinder barrel, and the outer oil storage cavity is communicated with the oil receiving port B; the rear end of the outer piston rod is provided with an inner oil storage cavity for accommodating the inner piston rod; the rear end of the inner piston rod is fixed on the cylinder barrel, and the front end of the inner piston rod is provided with an inner piston which is in sliding fit with the inner diameter surface of the outer piston rod; the inner piston rod is provided with an oil hole, one end of the oil hole is communicated with the oil receiving port A, and the other end of the oil hole is communicated with the inner oil storage cavity; when the outer piston rod extends out, an atmospheric cavity communicated with the outside atmosphere is formed between the inner piston rod and the cylinder barrel. Not only can reduce system power consumption, but also can reduce the volume of an oil tank. In particular in closed-mains systems, the tank can even be dispensed with.
Description
Technical Field
The utility model belongs to the hydraulic cylinder field, concretely relates to two effect hydraulic cylinder of novel structure.
Background
The double-acting hydraulic oil cylinder is generally divided into a rod cavity and a rodless cavity, and when the double-acting hydraulic oil cylinder works, because the volume difference between the rod cavity and the rodless cavity is generally large, the oil in the oil tank is less when the oil cylinder extends out, and the oil is more when the oil cylinder retracts. To meet such a change in the volume of the oil, it is necessary to design a larger tank to compensate for the change in the volume, so that the volume of the tank is increased and the weight of the tank is increased. As in conventional systems, large tanks need to be designed to accommodate volume changes; in the charge tank circuit, the charge pressure of the charge tank also varies greatly; in a closed circuit, the compensation reservoir needs to be sufficiently large. In some occasions, such as an aircraft landing gear retraction hydraulic system, a radar antenna folding system, an individual system and the like, the oil source needs to be small enough in size and light enough, and the requirement is difficult to meet by using a common double-acting hydraulic oil cylinder.
And traditional hydraulic cylinder, for no pole chamber effect when stretching out, produce thrust, have the pole chamber to play when withdrawing, produce the pulling force. The area of a rodless cavity of the traditional hydraulic oil cylinder is larger than that of a rod cavity, and the thrust of the oil cylinder is larger than the tension under the same working pressure. In some cases, the pulling force is greater than or equal to the pushing force, such as in some tilting mechanisms and lifting mechanisms, and in order to ensure that a proper pulling force can be obtained by using a conventional hydraulic cylinder, a sufficient pushing force is generated. In a constant displacement pump system, the system power is increased, which results in wasted power and an increase in both the volume and weight of the hydraulic system. It is therefore desirable to design a new dual acting hydraulic cylinder to effectively reduce the tank volume and weight, as well as reduce the system power consumption.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a two effect hydraulic cylinder of novel structure to solve the big, the high problem of system consumption of oil tank that present two effect hydraulic cylinder exists.
For realizing the purpose of the utility model, the technical proposal adopted is that: a double-acting hydraulic oil cylinder with a novel structure comprises a cylinder barrel, an outer piston rod and an inner piston rod which are sequentially arranged from outside to inside; the cylinder barrel is provided with an oil receiving port A and an oil receiving port B; the front end of the outer piston rod extends out of the cylinder barrel, the rear end of the outer piston rod is provided with an outer piston in sliding fit with the inner diameter surface of the cylinder barrel, an outer oil storage cavity is formed between the outer piston rod and the cylinder barrel, and the outer oil storage cavity is communicated with the oil receiving port B; the rear end of the outer piston rod is provided with an inner oil storage cavity for accommodating the inner piston rod; the rear end of the inner piston rod is fixed on the cylinder barrel, and the front end of the inner piston rod is provided with an inner piston which is in sliding fit with the inner diameter surface of the outer piston rod; the inner piston rod is provided with an oil hole, one end of the oil hole is communicated with the oil receiving port A, and the other end of the oil hole is communicated with the inner oil storage cavity; when the outer piston rod extends out, an atmospheric cavity communicated with the outside atmosphere is formed between the inner piston rod and the cylinder barrel.
As a further alternative, the cylinder has a vent in communication with the atmospheric chamber.
As a further alternative, the outer piston rod has an inner diameter D1The outer diameter of the outer piston rod is D2The inner diameter of the cylinder barrel is D3，D1 2＝D3 2-D2 2。
As a further alternative, the outer piston rod has an inner diameter D1The outer diameter of the outer piston rod is D2The inner diameter of the cylinder barrel is D3，D1 2＜D3 2-D2 2。
As a further alternative, the outer piston rod has an inner diameter D1The outer diameter of the outer piston rod is D2The inner diameter of the cylinder barrel is D3，D1 2＞D3 2-D2 2。
As a further alternative, the cylinder barrel comprises a tail part, a barrel wall and a head part which are fixedly connected in sequence, and the front end of the outer piston rod extends out of the cylinder barrel through the head part.
As a further alternative, the tail part is welded with the cylinder wall, and the head part is in threaded connection with the cylinder wall.
As a further alternative, the inner piston rod and the cylinder barrel are of an integral structure.
The utility model has the advantages that:
1. the double-acting hydraulic oil cylinder breaks the mode that when the traditional simple structure with the rod cavity and the rodless cavity extends out, the oil contained in the oil cylinder is large, and when the structure is retracted, the oil contained in the oil cylinder is small. When this novel double-acting hydraulic cylinder can accomplish to stretch out and when withdrawing, the oil jar inside flourishing oil volume unanimous or the characteristics that are close. When the hydraulic oil cylinder works, the extending oil and the retracting oil are equal or close, and the compensation of the hydraulic system to the hydraulic oil cylinder is reduced, so that the volume of the hydraulic oil cylinder is reduced, and the purposes of reducing the volume and the weight of a hydraulic source are achieved.
2. The principle of the novel double-acting hydraulic cylinder is realized by changing D1、D2、D3And the size is that under the same working pressure, the pulling force of the hydraulic oil cylinder is designed to be larger than or equal to the pushing force (when the pulling force and the pushing force are equal, the extending and retracting state volumes of the hydraulic oil cylinder are consistent). In a constant displacement pump system, on the occasion that the pulling force is greater than the pushing force, only the power consumption required by the pulling force needs to be considered, so that the purpose of reducing the power consumption of the system is achieved, the power consumption of the system is reduced, and the volume and the weight of a corresponding hydraulic system are reduced.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required for the description of the embodiments will be briefly introduced below, it should be understood that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a sectional view of a double-acting hydraulic cylinder of a novel structure provided by an embodiment of the present invention, the cylinder being in a fully retracted state;
FIG. 2 is a top plan view of the novel arrangement of the double acting hydraulic ram shown in FIG. 1;
FIG. 3 is a cross-sectional view of the novel structure of FIG. 1 in a fully extended condition;
reference numerals: 1-a cylinder barrel; 2-an outer piston rod; 3-an inner piston rod; 4-oil receiving port A; 5-oil receiving port B; 6-outer piston; 7-an outer oil storage cavity; 8-an inner oil storage cavity; 9-an inner piston; 10-atmosphere cavity; 11-a vent; 12-tail; 13-a cylinder wall; 14-head.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention. It is to be understood that the drawings are designed solely for the purposes of illustration and description and not as a definition of the limits of the invention. The connection relationships shown in the drawings are for clarity of description only and do not limit the manner of connection.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
Fig. 1 to fig. 3 show a double-acting hydraulic cylinder with a novel structure provided by the present invention, which comprises a cylinder barrel 1, an outer piston rod 2 and an inner piston rod 3, which are arranged in sequence from outside to inside; the cylinder barrel 1 is provided with an oil receiving port A4 and an oil receiving port B5; the front end of the outer piston rod 2 extends out of the cylinder barrel 1, the rear end of the outer piston rod is provided with an outer piston 6 in sliding fit with the inner diameter surface of the cylinder barrel 1, an outer oil storage cavity 7 is formed between the outer piston rod 2 and the cylinder barrel 1, and the outer oil storage cavity 7 is communicated with the oil receiving port B5; the rear end of the outer piston rod 2 is provided with an inner oil storage cavity 8 for accommodating the inner piston rod 3; the rear end of the inner piston rod 3 is fixed on the cylinder barrel 1, and the front end is provided with an inner piston 9 which is in sliding fit with the inner diameter surface of the outer piston rod 2; the inner piston rod 3 is provided with an oil hole, one end of the oil hole is communicated with the oil receiving port A4, and the other end of the oil hole is communicated with the inner oil storage cavity 8; when the outer piston rod 2 extends out, an atmosphere cavity 10 communicated with the outside atmosphere is formed between the inner piston rod 3 and the cylinder barrel 1.
The cylinder 1 is provided with a vent 11 which communicates with the atmosphere chamber 10, and air is introduced between the cylinder 1 and the inner piston rod 3 when the outer piston rod 2 extends out of the cylinder 1. The inner piston rod 3 and the inner diameter surface of the outer piston rod 2 are communicated with the atmosphere, namely, the atmosphere cavity 10. The cylinder barrel 1 comprises a tail part 12, a barrel wall 13 and a head part 14 which are fixedly connected in sequence, and the front end of the outer piston rod 2 extends out of the cylinder barrel 1 through the head part 14, so that the processing and the assembly are convenient. The tail part 12 is welded with the cylinder wall 13, and the head part 14 is in threaded connection with the cylinder wall 13. The inner piston rod 3 and the cylinder barrel 1 are of an integral structure and are integrally machined and formed. Other configurations and tooling arrangements are also possible.
The inner diameter of the outer piston rod 2 is D1The outer diameter of the outer piston rod 2 is D2The inner diameter of the cylinder barrel 1 is D3，D1 2＝D3 2-D2 2The pushing force is equal to the pulling force. Can also be set to D1 2＜D3 2-D2 2The pushing force is now less than the pulling force. Can also be set to D1 2＞D3 2-D2 2The pushing force is greater than the pulling force. The sizes can be set according to the actual requirements.
The double-acting hydraulic oil cylinder adopts a double-piston, double-piston-rod or double-cylinder design, the outer piston rod 2 plays a cylinder role relative to the inner piston rod 3, and plays a piston rod role relative to the cylinder barrel 1. According to the structural principle of the oil cylinder, the difference between the extending volume and the retracting volume of the oil cylinder can be changed at will, the volume in the extending state can be smaller than the volume in the retracting state, the volume in the extending state can be larger than the volume in the retracting state, and the volume in the extending state can be equal to the volume in the retracting state. According to the principle of the oil cylinder, the relationship between the pulling force and the pushing force of the oil cylinder can be changed at will by changing the size of the oil cylinder part, so that the pulling force of the oil cylinder is equal to the pushing force, the pulling force is greater than the pushing force, or the pulling force is less than the pushing force. The schematic diagram of the structure is shown in fig. 1 and fig. 2.
When the oil receiving port A4 of the hydraulic oil cylinder receives oil and the oil receiving port B5 returns oil, the outer piston rod 2 extends out to generate thrust. When the oil receiving port B5 receives oil and the oil receiving port A4 returns oil, tension is generated. Assuming that the stroke of the oil cylinder is S, when the oil cylinder is in a fully-retracted state, the oil capacity Q in the oil cylinder1Comprises the following steps:
when the oil cylinder is in a fully extending state, the oil capacity Q in the oil cylinder2Comprises the following steps:
at this time, it can be seen that when Q is1＝Q2When the oil cylinder is in the extending state, the volume of the oil tank is consistent with that of the oil tank in the retracting state. When D is present1 2＝D3 2-D2 2When is, Q1＝Q2(ii) a When D is present3 2-D2 2＞D1 2When is, Q1＞Q2(ii) a When D is present3 2-D2 2＜D1 2When is, Q1＜Q2(ii) a Such as when D1＝30，D2＝40，D3When Q is 50, Q1＝706.5S，Q2When Q is 706.5S1＝Q2The tank volume is minimal.
The fully extended state of the cylinder is shown in fig. 3. Assuming that the working pressure of the cylinder is P, the thrust F of the cylinder1Comprises the following steps:
the tension F of the oil cylinder2Comprises the following steps:
when D is present1 2＝D3 2-D2 2When F is present1＝F2(ii) a When D is present1 2＜D3 2-D2 2When F is present1＜F2(ii) a When D is present1 2＞D3 2-D2 2When F is present1＞F2. Such as when D1＝30，D2＝40，D3When it is 50, F1＝706.5P，F2706.5P, when F1＝F2. Also as when D1＝20，D2＝28，D3When it is equal to 40, F1＝314P，F2640.6P, when F2＞F1Namely, when the working pressure of the oil cylinder is fixed, the pulling force of the oil cylinder is greater than the pushing force.
The hydraulic cylinder breaks through the fixed mode that the conventional hydraulic cylinder is always larger than the pulling force in pushing force, and breaks through the fixed mode that the extending volume of the common oil cylinder is always larger than the retracting volume. Not only can reduce the system power consumption (mainly used for the occasion that the pulling force is greater than the thrust), but also can reduce the oil tank volume. In particular in closed-mains systems, the tank can even be dispensed with. Can design into thrust > pulling force, pulling force > thrust, or thrust be the pulling force, according to this structure principle, nimble changeable. The volume of the extension part is larger than the volume of the retraction part, the volume of the retraction part is larger than the volume of the extension part, or the volume of the extension part is larger than the volume of the retraction part. The hydraulic oil cylinder has good manufacturability, is consistent with the processing method of the conventional hydraulic oil cylinder, and has high reliability.
The present invention is not limited to the above-mentioned optional embodiments, and any other products in various forms can be obtained by anyone under the teaching of the present invention, and any changes in the shape or structure thereof, all the technical solutions falling within the scope of the present invention, are within the protection scope of the present invention.
Claims (8)
1. A double-acting hydraulic oil cylinder with a novel structure is characterized by comprising a cylinder barrel, an outer piston rod and an inner piston rod which are sequentially arranged from outside to inside; the cylinder barrel is provided with an oil receiving port A and an oil receiving port B; the front end of the outer piston rod extends out of the cylinder barrel, the rear end of the outer piston rod is provided with an outer piston in sliding fit with the inner diameter surface of the cylinder barrel, an outer oil storage cavity is formed between the outer piston rod and the cylinder barrel, and the outer oil storage cavity is communicated with the oil receiving port B; the rear end of the outer piston rod is provided with an inner oil storage cavity for accommodating the inner piston rod; the rear end of the inner piston rod is fixed on the cylinder barrel, and the front end of the inner piston rod is provided with an inner piston which is in sliding fit with the inner diameter surface of the outer piston rod; the inner piston rod is provided with an oil hole, one end of the oil hole is communicated with the oil receiving port A, and the other end of the oil hole is communicated with the inner oil storage cavity; when the outer piston rod extends out, an atmospheric cavity communicated with the outside atmosphere is formed between the inner piston rod and the cylinder barrel.
2. A double-acting hydraulic cylinder of novel structure according to claim 1, characterized in that said cylinder has a vent opening communicating with the atmospheric chamber.
3. A double acting hydraulic ram of novel construction as claimed in claim 1 wherein the inner diameter of the outer piston rod is D1The outer diameter of the outer piston rod is D2The inner diameter of the cylinder barrel is D3，D 2 1=D 2 3-D 2 2。
4. A double acting hydraulic ram of novel construction as claimed in claim 1 wherein the inner diameter of the outer piston rod is D1The outer diameter of the outer piston rod is D2The inner diameter of the cylinder barrel is D3，D 2 1＜D 2 3-D 2 2。
5. A double acting hydraulic ram of novel construction as claimed in claim 1 wherein the inner diameter of the outer piston rod is D1The outer diameter of the outer piston rod is D2The inner diameter of the cylinder barrel is D3，D 2 1＞D 2 3-D 2 2。
6. A double-acting hydraulic oil cylinder with a novel structure according to claim 1, characterized in that the cylinder barrel comprises a tail part, a barrel wall and a head part which are fixedly connected in sequence, and the front end of the outer piston rod extends out of the cylinder barrel through the head part.
7. A double-acting hydraulic oil cylinder with a novel structure as claimed in claim 6, characterized in that the tail part is welded with the cylinder wall, and the head part is in threaded connection with the cylinder wall.
8. A double-acting hydraulic oil cylinder with a novel structure according to claim 1 or 6, characterized in that the inner piston rod and the cylinder barrel are of an integral structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022890578.2U CN213981438U (en) | 2020-12-03 | 2020-12-03 | Double-acting hydraulic oil cylinder with novel structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022890578.2U CN213981438U (en) | 2020-12-03 | 2020-12-03 | Double-acting hydraulic oil cylinder with novel structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116447179A (en) * | 2023-06-20 | 2023-07-18 | 烟台亮远液压技术有限公司 | Hydraulic supercharger capable of simultaneously outputting pushing force and pulling force |
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2020
- 2020-12-03 CN CN202022890578.2U patent/CN213981438U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116447179A (en) * | 2023-06-20 | 2023-07-18 | 烟台亮远液压技术有限公司 | Hydraulic supercharger capable of simultaneously outputting pushing force and pulling force |
| CN116447179B (en) * | 2023-06-20 | 2023-08-18 | 烟台亮远液压技术有限公司 | Hydraulic supercharger capable of simultaneously outputting pushing force and pulling force |
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