阅读说明：本技术 等速差速可变油缸 (Constant speed differential variable oil cylinder ) 是由 胡安·卡洛斯 李燕闽 李生林 于 2019-08-23 设计创作，主要内容包括：本发明涉及液压油缸技术领域,特别是一种等速差速可变油缸,该油缸的主活塞和活塞杆构成的组合体内具有内活塞腔,内活塞腔内具有内活塞,内活塞腔的后端通过第一流道与缸筒的无杆腔连通,内活塞腔的前端通过第二流道与缸筒的有杆腔连通,内活塞的贯通道与第一流道错开设置,内活塞腔内还具有弹簧,弹簧作用在内活塞上推动内活塞移动至内活塞腔的后端封闭第一流道,缸筒的内径a为<Image he="72" wi="144" file="DDA0002177668590000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>活塞杆的外径b为D。组合体内还具有控制活塞杆、控制活塞腔和控制油道,控制活塞杆可伸入内活塞腔推动内活塞向后移动,通过控制油道通入的油压控制控制活塞杆的伸缩。有益效果是：本油缸可通过控制油道通入的油压变成等速、差速两用油缸,满足特定工况要求。(The invention relates to the technical field of hydraulic oil cylinders, in particular to a constant-speed differential variable oil cylinder, wherein an inner piston cavity is arranged in a combined body formed by a main piston and a piston rod of the oil cylinder, an inner piston is arranged in the inner piston cavity, the rear end of the inner piston cavity is communicated with a rodless cavity of a cylinder barrel through a first flow passage, the front end of the inner piston cavity is communicated with a rod cavity of the cylinder barrel through a second flow passage, a through passage of the inner piston is arranged in a staggered manner with the first flow passage, a spring is also arranged in the inner piston cavity, the spring acts on the inner piston to push the inner piston to move to the rear end of the inner piston cavity to seal the first flow passage, and the The outer diameter b of the piston rod is D. The combined body is also internally provided with a control piston rod, a control piston cavity and a control oil duct, and the control piston rod can extend into the inner cavityThe plug cavity pushes the inner piston to move backwards, and the oil pressure introduced through the control oil duct controls the extension and retraction of the control piston rod. The beneficial effects are that: the oil cylinder can be changed into a constant-speed and differential dual-purpose oil cylinder by controlling the oil pressure introduced by the oil duct, and the requirements of specific working conditions are met.)

1. The utility model provides a variable hydro-cylinder of constant speed differential, includes cylinder (8), main piston (3) and piston rod (1), and main piston (3) set up in cylinder (8), and the rear end and the main piston (3) of piston rod (1) are connected, and cylinder (8), characterized by are stretched out to the front end of piston rod (1): an inner piston cavity is arranged in a combined body formed by the main piston (3) and the piston rod (1), an inner piston (5) is arranged in the inner piston cavity, the rear end of the inner piston cavity is communicated with a rodless cavity of the cylinder barrel (8) through a first flow passage (9), the front end of the inner piston cavity is communicated with a rod cavity of the cylinder barrel (8) through a second flow passage (10),

the inner piston (5) is provided with a through passage, the through passage of the inner piston (5) is staggered with the first flow passage (9), a spring (4) is also arranged in the inner piston cavity, the spring (4) acts on the inner piston (5) to push the inner piston (5) to move to the rear end of the inner piston cavity to seal the first flow passage (9),

The inner diameter a of the cylinder (8) isThe outer diameter b of the piston rod (1) is D,

The combined body is also internally provided with a control piston rod (2), a control piston cavity and a control oil duct (11), the control piston rod (2) is arranged in the control piston cavity, the rear end of the control piston cavity is communicated with the inner piston cavity, so that the control piston rod (2) can extend into the inner piston cavity to push the inner piston (5) to move backwards, the front end of the control piston cavity is communicated with the control oil duct (11), an oil port of the control oil duct (11) is positioned at the front end part of the piston rod (1),

The second flow passage (10) is composed of flow passages which are communicated with each other and are respectively positioned in the control piston rod (2) and the combined body, and the communication part of the flow passages in the control piston rod (2) and the combined body is positioned on the side surface of the control piston rod (2).

2. The constant velocity differential variable cylinder according to claim 1, characterized in that: the control piston cavity is located at the rear end of the piston rod (1), the inner piston cavity is located in the main piston (3), an end cover (6) for plugging the inner piston cavity is arranged on the rear end face of the main piston (3), and the first flow channel (9) is arranged on the end cover (6).

3. The constant velocity differential variable cylinder according to claim 1, characterized in that: an adjusting screw (7) is installed on an oil port of the control oil duct (11), and the oil pressure of hydraulic oil of the control oil duct (11) is adjusted by screwing in or screwing out the adjusting screw (7).

4. the constant velocity differential variable cylinder according to claim 2, characterized in that: the flow passage in the control piston rod (2) is composed of an axial oil hole extending along the axial direction in the center of the control piston rod (2) and a radial oil hole which is communicated with the axial oil hole and extends along the radial direction of the control piston rod (2), the flow passage in the combination is composed of a ring groove surrounding a control piston cavity and a radial oil hole which is communicated with the ring groove and extends along the radial direction of the combination, and the axial oil hole of the control piston rod (2) is coaxial with the through passage of the inner piston (5).

5. The constant velocity differential variable cylinder according to claim 1, 2, 3 or 4, characterized in that: the constant-speed differential variable oil cylinder is a double-acting single-piston-rod hydraulic oil cylinder.

Technical Field

the invention relates to the technical field of hydraulic oil cylinders, in particular to a constant-speed differential variable oil cylinder.

Background

The constant-speed oil cylinder means that the extending and retracting time of the piston rod is the same. The differential oil cylinder is characterized in that the extending and retracting time of a piston rod is different, and the constant-speed oil cylinder in the prior art is generally in a double-out-rod form or an inner-inserting-rod form. The oil cylinder in the double-rod form has relatively large volume, and the installation form can only adopt the form of a middle trunnion; the structure of the inner inserted rod type is complex, the processing requirement is high, the stretching speed is slightly different, and a constant speed differential variable oil cylinder is not seen in the prior art.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: provided is a constant velocity differential variable cylinder having a compact structure.

The technical scheme adopted by the invention for solving the technical problems is as follows: the constant-speed differential variable oil cylinder comprises a cylinder barrel, a main piston and a piston rod, wherein the main piston is arranged in the cylinder barrel, the rear end of the piston rod is connected with the main piston, the front end of the piston rod extends out of the cylinder barrel, an inner piston cavity is formed in a combined body formed by the main piston and the piston rod, an inner piston is arranged in the inner piston cavity, the rear end of the inner piston cavity is communicated with a rodless cavity of the cylinder barrel through a first flow passage, the front end of the inner piston cavity is communicated with a rod cavity of the cylinder barrel through a second flow passage, the inner piston is provided with a through passage, the through passage of the inner piston is arranged in a staggered mode with the first flow passage, a spring is further arranged in the inner piston cavity, the spring acts on the inner piston to push the inner piston to move to the rear endThe outer diameter b of the piston rod is D, a control piston rod, a control piston cavity and a control oil duct are further arranged in the combined body, the control piston rod is arranged in the control piston cavity, the rear end of the control piston cavity is communicated with the inner piston cavity, the control piston rod can stretch into the inner piston cavity to push the inner piston to move backwards, the front end of the control piston cavity is communicated with the control oil duct, an oil port of the control oil duct is located at the front end of the piston rod, a second flow duct is formed by mutually communicated flow passages which are respectively located in the control piston rod and the combined body, and the communication part of the flow passages in the control piston rod and the combined bodyThe side of the piston rod is made. The oil pressure introduced by the control oil duct controls the extension of the control piston rod, so that the constant-speed differential variable oil cylinder can be changed between the constant-speed oil cylinder and the differential oil cylinder.

Specifically, the control piston cavity is located at the rear end of the piston rod, the inner piston cavity is located in the main piston, an end cover for plugging the inner piston cavity is arranged on the rear end face of the main piston, and the first flow channel is arranged on the end cover.

In order to realize the manual switching of the oil cylinder between the constant speed working state and the differential working state, the oil port of the control oil channel is further limited, and the oil pressure of the hydraulic oil of the control oil channel is adjusted by screwing in or screwing out the adjusting screw.

Specifically, the flow passage in the control piston rod is composed of an axial oil hole extending in the axial direction in the center of the control piston rod and a radial oil hole extending in the radial direction of the control piston rod and communicated with the axial oil hole, the flow passage in the combined body is composed of a ring groove surrounding the control piston cavity and a radial oil hole extending in the radial direction of the combined body and communicated with the ring groove, and the axial oil hole of the control piston rod is coaxial with the through passage of the inner piston.

Specifically, the constant-speed differential variable oil cylinder is a double-acting single-piston-rod hydraulic oil cylinder.

The invention has the beneficial effects that: the oil cylinder can be changed into a constant-speed and differential dual-purpose oil cylinder by controlling the oil pressure introduced by the oil duct, and the requirements of specific working conditions are met.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.

In the figure, 1 is a piston rod, 2 is a control piston rod, 3 is a main piston, 4 is a spring, 5 is an inner piston, 6 is an end cover, 7 is an adjusting screw, 8 is a cylinder barrel, 9 is a first flow passage, 10 is a second flow passage, and 11 is a control oil passage.

Detailed Description