Oil cylinder oil return structure

Abstract

The utility model relates to an oil return structure of an oil cylinder, which belongs to the field of oil cylinders and comprises a main cylinder body and a return cavity, an auxiliary working cavity is arranged outside the return cavity, an oil inlet cavity is arranged outside the main cylinder body, and a first oil inlet is simultaneously communicated with the main cylinder body and the auxiliary working cavity through the oil inlet cavity; a first channel communicated with the auxiliary working cavity is arranged in the return stroke cavity; an annular cavity is formed among the inner wall of the return stroke cavity, the outer wall of the connecting rod and the shaft sleeve, a check ring is fixedly connected into the cavity, a fourth channel connected with the first channel is formed in the check ring, and when oil enters the cavity from the oil inlet cavity through the auxiliary working cavity, the shaft sleeve is driven to drive the connecting rod to move upwards. Oil is fed through the oil inlet cavity, so that oil enters the cavity through the auxiliary working cavity to drive the shaft sleeve to drive the connecting rod to move upwards, the oil in the cavity flows back to the auxiliary working cavity and flows back to the first oil inlet from the oil inlet cavity, redundant oil is discharged in time, and the phenomenon that the oil is prone to accumulation in the cavity is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinders, in particular to an oil return structure of an oil cylinder. Background Art

[0002] With the continuous development of industrial technology, hydraulic devices play a vital role in various fields. Whether in mechanical manufacturing, engineering construction, or automated production, efficient and reliable hydraulic systems are indispensable. Hydraulic devices achieve the conversion of force and motion through the transmission of pressure through a medium, offering advantages such as high output force and fast response speed.

[0003] However, many problems are common in traditional oil cylinder structures. In terms of power transmission, the oil can often only act on the piston within a relatively single path, making it difficult to achieve multi-path coordinated power transmission. This not only limits the output power of the oil cylinder, but also easily causes large energy losses locally, reducing the overall energy utilization efficiency. In addition, traditional oil cylinders also lack flexibility in oil circulation and chamber pressure regulation. The oil is prone to accumulation in the chamber, and the excess oil cannot be discharged in time, affecting the working stability and service life of the oil cylinder. Moreover, it is difficult to effectively control and utilize the pressure changes in the chamber.

[0004] In summary, the oil cylinder structure in the prior art has deficiencies in power transmission, oil circulation, and pressure regulation. The present invention proposes an innovative oil cylinder oil return structure to address these problems. Utility Model Content

[0005] In order to solve the problems in the related art, the utility model provides an oil cylinder oil return structure, which solves the problems in the prior art of the oil cylinder structure in terms of power transmission, oil circulation and pressure regulation.

[0006] To solve the above problems, the following technical solutions are provided:

[0007] and a tube connecting the dischar e side of the pump with a plug in the forward end of the crank case, said tube having a check valve in it at the pump end, and said former tube which connects the pump to the oil drain plug, said tube having a check valve in it at the pump end, and said former tube which connects the pump to the oil drain plug, said tube having a check valve in it at the pump end.

[0008] When the cam is in the air, the oil in the oil pocket is turned back to the pump, and then the cam, which is in the air, is turned back to the pump, and then the oil in the oil pocket is turned to the pump pocket.

[0009] A secondary chamber piston is provided in the secondary working chamber, and the secondary chamber piston divides the secondary working chamber into an upper chamber and a lower chamber. The upper chamber is communicated with the oil inlet chamber, and the lower chamber is communicated with the cavity.

[0010] By adopting the above scheme, the auxiliary working chamber is divided into upper and lower chambers by using the auxiliary chamber piston. The upper chamber and the lower chamber are not connected and different media are respectively introduced into them. Then, the auxiliary chamber piston is set to transmit power between the upper chamber and the lower chamber, which ensures the stability of power transmission and can more thoroughly remove the oil from the oil inlet chamber.

[0011] The auxiliary working chamber is connected to the return chamber as a whole. The main cylinder body is provided with an auxiliary chamber inlet, which is used to connect the end of the oil inlet chamber with the upper chamber.

[0012] By adopting the above scheme, the auxiliary working chamber and the return chamber are designed as an integrated structure, and an auxiliary chamber inlet is provided to connect the oil inlet chamber and the upper chamber of the auxiliary working chamber, ensuring that the medium can accurately enter the corresponding chamber and guarantee the normal operation of the cylinder.

[0013] A fifth channel is also provided on the main cylinder body at the second oil inlet, an oil drain chamber is provided on the outside of the main cylinder body, a second channel is provided on the return chamber, the fifth channel is connected with the second channel through the oil drain chamber, an annular plug is provided at the bottom of the return chamber, a third channel connected with one end of the second channel is provided on the plug, one end of the connecting rod is arranged in a sliding seal through the annular plug, and an oil drain port is provided on this end of the connecting rod, and an oil drain hole connected with the oil drain port is provided on the side wall of the connecting rod.

[0014] By adopting the above scheme, a fifth channel and an oil drain chamber are set on the main cylinder body, a second channel is set on the return chamber, a third channel on the plug, and an oil drain port and an oil drain hole on the connecting rod, forming a complete oil return passage, so that the oil in the main cylinder body can be discharged smoothly.

[0015] The inner wall of the sleeve is threadedly connected to one end of the connecting rod facing the main cylinder body.

[0016] The above solution enhances the connection strength and stability between the sleeve and the connecting rod, prevents loosening or relative displacement between the two during operation, ensures the reliability of power transmission, and reduces the risk of abnormal cylinder return or failure due to failure of the connecting components.

[0017] The end of the fifth channel is set to be open, one end of the oil drain chamber is connected to the open and a nut sleeve is provided in the open, an adjusting bolt is provided on the nut sleeve, and an adjusting hole connected to the oil drain chamber is opened on the side of the nut sleeve. The adjusting bolt is used to screw in and out of the nut sleeve to change the size of the adjusting hole.

[0018] By adopting the above scheme, an opening is set at the end of the fifth channel and the size of the adjustment hole is adjusted by the nut sleeve and the adjusting bolt, which can conveniently fine-tune the pressure and flow of the oil discharge chamber to adapt to the requirements of the cylinder oil return under different working conditions, thereby improving the adaptability and flexibility of the cylinder oil return structure.

[0019] The above solution has at least the following advantages:

[0020] and a tube connecting the dischar e side of the pump with a plug in the forward end of the crank case, said tube having a check valve in it at the pump end, and said former tube which connects the pump to the oil drain plug, said tube having a check valve in it at the pump end, and said former tube which connects the pump to the oil drain plug, and said former tube which connects the pump to the oil drain plug, and said former tube which connects the pump to the oil drain plug, and said former tube which connects the pump to the oil drain plug.

[0021] 2. A secondary chamber piston is provided in the secondary working chamber, which divides the secondary working chamber into an upper chamber and a lower chamber. The upper chamber is connected to the oil inlet chamber, and the lower chamber is connected to the cavity. The secondary working chamber is divided into an upper and lower chamber by the secondary chamber piston. The upper and lower chambers are not connected and different media are introduced into them respectively. The power transmission between the upper and lower chambers is then carried out by setting the secondary chamber piston, which ensures the stability of the power transmission and can more thoroughly remove the oil from the oil inlet chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0023] Figure 1 2 is a cross-sectional schematic diagram of the oil return structure of the oil cylinder in the first embodiment;

[0024] Figure 2 yes Figure 1 A magnified view of part A;

[0025] Figure 3 yes Figure 1 A magnified view of part B;

[0026] Figure 4 yes Figure 1 Magnified view of part C;

[0027] Figure 5 It is a cross-sectional schematic diagram of the oil return structure of the oil cylinder of the second embodiment.

[0028] Figure markings: 1. main cylinder body; 2. return chamber; 201. first channel; 202. second channel; 3. oil inlet chamber; 4. auxiliary working chamber; 401. auxiliary chamber inlet; 5. auxiliary chamber piston; 6. piston rod; 7. main cylinder piston; 8. connecting rod; 801. oil drain hole; 802. oil drain port; 9. oil drain chamber; 10. plug; 1001. third channel; 11. first oil inlet; 12. second oil inlet; 13. cavity; 14. sleeve; 15. retaining ring; 1501. fourth channel; 16. adjusting bolt; 17. fifth channel; 18. nut sleeve; 1801. adjusting hole. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] like Figure 1 As shown, a cylinder oil return structure of the first embodiment includes a main cylinder body 1 and a return cavity 2, the main cylinder body 1 is provided with a first oil inlet 11 and a second oil inlet 12, the second oil inlet 12 is communicated with the interior of the main cylinder body 1, a main cylinder piston 7 and a piston rod 6 connected to the main cylinder piston 7 are provided in the main cylinder body 1; one end of the piston rod 6 extends from the main cylinder body 1 and then extends into the return cavity 2, a connecting rod 8 is provided inside the return cavity 2 to abut against one end of the piston rod 6, and the end of the connecting rod 8 is also connected to the inner wall of the return cavity 2 in a sliding and sealing manner through a shaft sleeve 14; an auxiliary working Working chamber 4, an oil inlet chamber 3 is provided outside the main cylinder body 1, and the first oil inlet port 11 is connected with the main cylinder body 1 and the auxiliary working chamber 4 at the same time through the oil inlet chamber 3; a first channel 201 connected with the auxiliary working chamber 4 is provided in the return chamber 2; an annular cavity 13 is formed between the inner wall of the return chamber 2, the outer wall of the connecting rod 8 and the shaft sleeve 14, and a retaining ring 15 is fixedly connected in the cavity 13, and a fourth channel 1501 connected with the first channel 201 is opened on the retaining ring 15. When the oil enters the cavity 13 from the oil inlet chamber 3 through the auxiliary working chamber 4, the driving shaft sleeve 14 drives the connecting rod 8 upward.

[0031] It can be seen that the oil return structure of the oil cylinder is provided with the main cylinder body 1, the return cavity 2 and the oil inlet cavity 3, so that the oil inlet cavity 3 is connected with the main cylinder body 1 and the auxiliary working cavity 4 at the same time. After the oil enters from the oil inlet cavity 3, it is divided into two paths. One path enters the main cylinder body 1 to drive the piston upward, and the other path enters the cavity 13 through the auxiliary working cavity 4 and then pushes the sleeve 14 upward, so that the sleeve 14 drives the connecting rod 8 upward and the oil in the main cylinder body 1 together pushes the piston rod 6 upward, realizing the reasonable distribution of oil in the main cylinder body 1 and the cavity 13. The power conversion is coordinated to increase the output power of the oil cylinder; when the piston moves downward, the oil enters the main cylinder body 1 directly from the second oil inlet 12 to push the main cylinder piston 7 downward. At this time, the oil in the main cylinder body 1 flows back to the oil inlet chamber 3 under the squeezing and pushing of the main cylinder piston 7; since the piston rod 6 moves downward, the shaft sleeve 14 and the connecting rod 8 are pushed downward, so that the oil in the cavity 13 flows back to the auxiliary working chamber 4 and flows back from the oil inlet chamber 3 to the first oil inlet 11, thereby discharging excess oil in time to avoid the backlog of oil in the chamber.

[0032] like Figure 2 As shown, since the retaining ring 15 is arranged in the cavity 13, the retaining ring 15 is located below the sleeve 14 so as to be against the bottom of the sleeve 14, and a channel is provided to communicate with the interior of the return cavity 2 and the lower chamber of the auxiliary working chamber 4. The sleeve 14 is supported by the retaining ring 15 to ensure its stable position, while ensuring the smooth flow of gas between the relevant chambers, providing a guarantee for the stable up and down movement of the connecting rod 8, and helping to maintain the stable operation of the cylinder.

[0033] like Figure 3 and 4 As shown, a fifth channel 17 is further provided on the main cylinder body 1 at the second oil inlet 12, an oil drain chamber 9 is provided on the outside of the main cylinder body 1, a second channel 202 is provided on the return chamber 2, the fifth channel 17 is connected with the second channel 202 through the oil drain chamber 9, an annular plug 10 is provided at the bottom of the return chamber 2, a third channel 1001 connected with one end of the second channel 202 is provided on the plug 10, one end of the connecting rod 8 is arranged in a sliding seal through the annular plug 10, and an oil drain port 802 is provided on this end of the connecting rod 8, and an oil drain hole 801 connected with the oil drain port 802 is provided on the side wall of the connecting rod 8. The fifth channel 17, the oil drain chamber 9, the second channel 202 are provided on the return chamber 2, the third channel 1001 on the plug 10, and the oil drain port and the oil drain hole 801 on the connecting rod 8 form a complete oil return passage, so that the oil in the main cylinder body 1 can be discharged smoothly.

[0034] Furthermore, the auxiliary working chamber 4 of the first embodiment is connected to the return chamber 2 as a whole, and a auxiliary chamber inlet 401 is opened on the main cylinder body 1. The auxiliary chamber inlet 401 is used to connect the end of the oil inlet chamber 3 with the upper chamber. The auxiliary working chamber 4 and the return chamber 2 are designed as an integrated structure, and the auxiliary chamber inlet 401 is provided to connect the oil inlet chamber 3 and the upper chamber of the auxiliary working chamber 4, which simplifies the overall structure, reduces the number of parts, and reduces the manufacturing and assembly costs. At the same time, it ensures that the medium can accurately enter the corresponding chamber to ensure the normal operation of the cylinder.

[0035] Furthermore, this embodiment can control the pressure change in the chamber to ensure effective control and utilization of the oil cylinder. Specifically, the end of the fifth channel 17 is set to be open, one end of the oil discharge chamber 9 is connected to the opening and a nut sleeve 18 is provided in the opening, an adjusting bolt 16 is provided on the nut sleeve 18, and an adjusting hole 1801 connected to the oil discharge chamber 9 is opened on the side of the nut sleeve 18. The nut sleeve 18 is screwed in and out by the adjusting bolt 16 to change the size of the adjusting hole 1801. A nut sleeve 18 with an adjusting bolt 16 is provided at the end of the fifth channel 17, and the size of the adjusting hole 1801 is changed by rotating the adjusting bolt 16. It can be seen that the size of the adjusting hole 1801 can be adaptively changed by using the adjusting bolt 16, so that the oil discharge flow of the oil discharge chamber 9 can be flexibly controlled, and the precise adjustment of the oil discharge process of the cylinder can be achieved, which helps to optimize the working performance of the cylinder. In addition, the inner wall of the sleeve 14 is threadedly connected to the end of the connecting rod 8 facing the main cylinder body 1, which enhances the connection strength and stability between the sleeve 14 and the connecting rod 8, prevents the two from loosening or relative displacement during operation, ensures the reliability of power transmission, and reduces the risk of abnormal cylinder return or failure due to failure of the connecting components.

[0036] like Figure 5 As shown, as a second embodiment of an oil cylinder oil return structure, the difference from the first embodiment is that in the second embodiment, a secondary chamber piston 5 is provided in the secondary working chamber 4, and the secondary chamber piston 5 divides the secondary working chamber 4 into an upper chamber and a lower chamber. The upper chamber is connected to the oil inlet chamber 3, and the lower chamber is connected to the cavity 13. The secondary chamber piston 5 is used to divide the secondary working chamber 4 into an upper and lower chamber. The upper chamber and the lower chamber are not connected and different media are respectively introduced. The power transmission between the upper chamber and the lower chamber is then carried out by providing the secondary chamber piston 5, which ensures the stability of the power transmission and can more thoroughly remove the oil from the oil inlet chamber 3.

[0037] In the second embodiment, the upward movement of the master cylinder piston 7 occurs as follows: oil enters the oil inlet chamber 3 from the first oil inlet 11. At the end of the oil inlet chamber 3, the oil is divided into two paths. Most of the oil enters the master cylinder body 1, driving the master cylinder piston 7 upward, while the other part enters the auxiliary working chamber 4 through the auxiliary chamber inlet 401, driving the auxiliary chamber piston 5 to move. It should be noted that at this time, the auxiliary working chamber 4 is divided into two upper and lower chambers by the auxiliary chamber piston 5. The upper chamber is connected to the oil from the oil inlet chamber 3, while the lower chamber can be filled with gas. The gas in the lower chamber enters the fourth channel 1501 from the first channel 201, thereby driving the sleeve 14 and the connecting rod 8 fixed to the sleeve 14 upward. In other words, the pressure generated by the oil connected to the upper chamber is converted into the power of the gas to push the connecting rod 8 upward.

[0038] During the downward process of the master cylinder piston 7: the first oil inlet 11 stops the oil from entering, and the oil instead enters the master cylinder body 1 from the second oil inlet 12, driving the master cylinder piston 7 downward, and then the piston rod 6 rigidly connected to the master cylinder piston 7 moves downward and enters the cavity 13 and pushes the connecting rod 8 downward. Since the side wall of the sleeve 14 connected to the connecting rod 8 is in sliding sealing contact with the inner wall of the return cavity 2, the sleeve 14 will push and compress the gas. At this time, the gas will return to the lower chamber of the auxiliary working chamber 4 through the fourth channel 1501 and the first channel 201, driving the auxiliary chamber piston 5 upward. At this time, the residual oil in the oil inlet chamber 3 will be pushed to the first oil inlet 11 after the auxiliary chamber piston 5 moves upward, and the excess oil is discharged in time to ensure the working stability and service life of the cylinder.

[0039] It is understood that the present invention is described by way of certain embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A cylinder oil return structure, comprising a main cylinder body (1) and a return cavity (2), wherein the main cylinder body (1) is provided with a first oil inlet (11) and a second oil inlet (12), the second oil inlet (12) being communicated with the interior of the main cylinder body (1), the main cylinder body (1) being provided with a main cylinder piston (7) and a piston rod (6) connected to the main cylinder piston (7); one end of the piston rod (6) extending from the main cylinder body (1) and then extending into the return cavity (2), characterized in that: The return chamber (2) is provided with a connecting rod (8) that abuts against one end of the piston rod (6), and the end of the connecting rod (8) is also connected to the inner wall of the return chamber (2) in a sliding and sealing manner through a shaft sleeve (14); the return chamber (2) is provided with an auxiliary working chamber (4) outside, and the main cylinder (1) is provided with an oil inlet chamber (3) outside, and the first oil inlet (11) is connected to the main cylinder (1) and the auxiliary working chamber (4) at the same time through the oil inlet chamber (3); the return chamber (2) is provided with a connecting rod (8) that abuts against one end of the piston rod (6), and the connecting rod (8) is also connected to the inner wall of the return chamber (2) in a sliding and sealing manner through a shaft sleeve (14); the return chamber (2) is provided with an auxiliary working chamber (4) outside, and the main cylinder (1) is provided with an oil inlet chamber (3) outside, and the first oil inlet (11) is connected to the main cylinder (1) and the auxiliary working chamber (4) at the same time through the oil inlet chamber (3); (4) a first channel (201) connected to the return chamber (2); an annular cavity (13) is formed between the inner wall of the return chamber (2), the outer wall of the connecting rod (8) and the shaft sleeve (14); a retaining ring (15) is fixedly connected to the cavity (13); a fourth channel (1501) connected to the first channel (201) is opened on the retaining ring (15); when oil enters the cavity (13) from the oil inlet chamber (3) through the auxiliary working chamber (4), the driving shaft sleeve (14) drives the connecting rod (8) upward.

2. The oil return structure of the oil cylinder according to claim 1, characterized in that: A secondary chamber piston (5) is provided in the secondary working chamber (4), and the secondary chamber piston (5) divides the secondary working chamber (4) into an upper chamber and a lower chamber, wherein the upper chamber is communicated with the oil inlet chamber (3), and the lower chamber is communicated with the cavity (13).

3. The oil cylinder oil return structure according to claim 2, characterized in that: The auxiliary working chamber (4) is connected to the return chamber (2) as a whole. The main cylinder body (1) is provided with an auxiliary chamber inlet (401), and the auxiliary chamber inlet (401) is used to connect the end of the oil inlet chamber (3) with the upper chamber.

4. The oil return structure of an oil cylinder according to any one of claims 1 to 3, characterized in that: The main cylinder body (1) is further provided with a fifth channel (17) at the second oil inlet (12), an oil drain chamber (9) is provided outside the main cylinder body (1), a second channel (202) is provided on the return chamber (2), the fifth channel (17) is communicated with the second channel (202) through the oil drain chamber (9), an annular plug (10) is provided at the bottom of the return chamber (2), a third channel (1001) is provided on the plug (10) and is communicated with one end of the second channel (202), one end of the connecting rod (8) is provided in a sliding sealing shape through the annular plug (10), and an oil drain port (804) is provided on this end of the connecting rod (8), and an oil drain hole (803) is provided on the side wall of the connecting rod (8) and is communicated with the oil drain port (804).

5. The oil return structure of the oil cylinder according to claim 1, characterized in that: The inner wall of the shaft sleeve (14) is threadedly connected to one end of the connecting rod (8) facing the main cylinder body (1).

6. The oil return structure of the oil cylinder according to claim 4, characterized in that: The end of the fifth passage (17) is set to be open, one end of the oil discharge chamber (9) is connected to the open, and a nut sleeve (18) is provided in the open, an adjusting bolt (19) is provided on the nut sleeve (18), and an adjusting hole (1801) connected to the oil discharge chamber (9) is opened on the side of the nut sleeve (18), and the size of the adjusting hole (1801) is changed by screwing the nut sleeve (18) in and out using the adjusting bolt (19).

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