Hydraulic transmission device

Abstract

The utility model provides a hydraulic transmission device which comprises a cylinder body, a piston rod is arranged in the cylinder body, the piston rod is hollow, the front end of the piston rod extends out of the cylinder body, a piston piece is arranged on the side wall of the rear end of the piston rod, the lower end of the cylinder body is fixedly connected with a driving motor, and the output end of the driving motor is fixedly connected with a screw rod. The screw extends into the piston rod, an internal thread part is fixedly connected to the interior of the tail end of the piston rod, and the screw penetrates through the internal thread part and is in thread self-locking fit with the internal thread part. According to the invention, the driving motor, the screw rod and other parts are arranged, so that assistance is provided for the piston rod, and a holding function is also provided for the piston rod.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic transmission, in particular to a hydraulic transmission device. BACKGROUND

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy, and does linear reciprocating motion (or oscillating motion). It is simple in structure and reliable in operation. When it is used to realize reciprocating motion, the reduction device can be omitted, and there is no transmission gap, so the motion is stable. Therefore, it is widely used in various mechanical hydraulic systems.

[0003] The existing hydraulic cylinder is kept after work, mostly by closing the valve. But in the process of keeping for a long time, there is also leakage of hydraulic oil at the valve, which makes the hydraulic rod change the axial position and cannot effectively support for a long time. SUMMARY

[0004] To solve the above problems, the present application discloses a hydraulic transmission device, which comprises a cylinder body, the inside of the cylinder body is provided with a piston rod, the piston rod is hollow and the front end extends out of the cylinder body, and the rear end side wall of the piston rod is provided with a piston piece. The cylinder body, the piston rod and the piston piece constitute a hydraulic cylinder, and the hydraulic oil is inputted / discharged to realize the action of the piston rod.

[0005] The lower end of the cylinder body is fixedly connected with a driving motor, the output end of the driving motor is fixedly connected with a screw rod, the screw rod extends into the inside of the piston rod, the tail end inside of the piston rod is fixedly connected with an internal thread piece, the internal thread piece is penetrated by the screw rod and is threadedly self-locked with the screw rod. By setting the driving motor and the cooperation of the screw rod and the internal thread piece, power can be provided for the action of the piston rod, and the self-locking thread ensures the position keeping of the piston rod after driving.

[0006] Preferably, the lower end of the cylinder body is provided with a connecting plate, and the driving motor is fixedly connected on the connecting plate. The connecting plate blocks the lower end of the cylinder body, and a sealing gasket is arranged between the connecting plate and the cylinder body.

[0007] Preferably, the upper end of the connecting plate is provided with a convex sleeve in the middle, the screw rod penetrates the middle of the convex sleeve, the inside of the convex sleeve is provided with a first sealing ring, a buckling piece is arranged above the first sealing ring, and the buckling piece is threadedly connected with the inner wall of the convex sleeve. By tightening the buckling piece, the first sealing ring is deformed to tightly contact, so as to realize the sealing of the middle of the connecting plate and the screw rod.

[0008] Preferably, a fixing piece is threadedly connected with the tail end of the piston rod, the fixing piece abuts against the piston piece, and sealing rings are arranged on the inner and outer walls of the piston piece. The fixing piece limits the piston piece to ensure the fixation of the piston piece.

[0009] Preferably, an embracing sleeve is arranged inside one end of the cylinder body, a second sealing ring is arranged inside the embracing sleeve, and the piston rod extends from the embracing sleeve. The embracing sleeve and the second sealing ring realize the sealing between the cylinder body and the piston rod.

[0010] Preferably, a through hole is arranged on the inner threaded part. During the operation of the piston rod, the through hole realizes the entry and exit of hydraulic oil into the chamber inside the piston rod, and ensures the pressure balance.

[0011] Preferably, the sidewalls of the two ends of the cylinder body are respectively provided with a first oil port and a second oil port. The piston member is located between the first oil port and the second oil port, the first oil port and the second oil port inject or discharge oil, and realize the extension or retraction of the piston rod.

[0012] The beneficial effects of the present application are as follows:

[0013] 1. The screw rod and the inner threaded part are arranged in a self-locking manner, and the piston rod can maintain the position after the operation of the piston rod is stopped.

[0014] 2. The driving motor is arranged to drive the screw rod to rotate, and the driving motor is linked during the operation of the piston rod to provide power assistance for the piston rod. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a perspective view of the present application;

[0016] Figure 2 is a sectional view of the present application;

[0017] Figure 3 is Figure 2 is an enlarged view of A in FIG. 1;

[0018] Figure 4 is Figure 2 is an enlarged view of B in FIG. 1;

[0019] Figure 5 is a schematic view of the lower end structure of the piston rod of the present application.

[0020] LIST OF REFERENCE NUMBERS

[0021] 1. driving motor; 2. connecting plate; 3. cylinder body; 4. first oil port; 5. second oil port; 6. piston rod; 7. piston member; 8. screw rod; 9. first sealing ring; 10. convex sleeve; 11. buckling part; 12. second sealing ring; 13. embracing sleeve; 14. inner threaded part; 15. fixing part. DETAILED DESCRIPTION

[0022] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0023] like Figures 1 to 5 As shown, a hydraulic transmission device includes a cylinder body 3, which is cylindrical. A piston rod 6 is disposed inside the cylinder body 3. The piston rod 6 is hollow and extends out of the cylinder body 3 at its front end. A piston element 7 is disposed on the rear side wall of the piston rod 6. That is, the cylinder body 3, the piston rod 6, and the piston element 7 constitute a hydraulic cylinder, and the extension or retraction of the piston rod 6 is realized by hydraulic pressure.

[0024] A drive motor 1 is fixedly connected to the lower end of the cylinder body 3. A screw 8 is fixedly connected to the output end of the drive motor 1, and the screw 8 extends into the interior of the piston rod 6. An internal threaded component 14 is fixedly connected to the tail end of the piston rod 6. The internal threaded component 14 is penetrated by the screw 8 and is self-lockingly engaged with it. During the operation of the hydraulic cylinder, the drive motor 1 can be started, providing assistance for the extension or retraction of the piston rod 6 through the screw 8 and the internal threaded component 14. After the hydraulic cylinder stops working, the self-locking engagement between the screw 8 and the internal threaded component 14, i.e., the small thread pressure angle, generates greater friction, limiting the axial force on the internal threaded component 14, while the screw 8 rotates, thereby maintaining the position of the piston rod 6. Furthermore, during the movement of the piston rod 6, the drive motor 1 needs to be controlled in conjunction with the operation.

[0025] A connecting plate 2 is provided at the lower end of the cylinder body 3. The connecting plate 2 is a plate piece used to seal the lower end of the cylinder body 3. The drive motor 1 is fixedly connected to the connecting plate 2, that is, the drive motor 1 and the cylinder body 3 are fixed together through the connecting plate 2. Bolts and screws are inserted at the four corners of the connecting plate 2.

[0026] A convex sleeve 10 is provided at the upper middle part of the connecting plate 2. The convex sleeve 10 is a tubular structure. The screw 8 passes through the middle of the convex sleeve 10. A first sealing ring 9 is provided on the inner side of the convex sleeve 10, that is, the first sealing ring 9 is sleeved on the outer side of the screw 8. A clamping member 11 is provided above the first sealing ring 9, and the clamping member 11 is threadedly connected to the inner wall of the convex sleeve 10. By tightening the clamping member 11, the first sealing ring 9 is deformed, thereby improving the sealing performance between the screw 8 and the convex sleeve 10.

[0027] The piston rod 6 is threaded to a fixing member 15, which abuts against the piston 7. The end of the piston rod 6 has a stepped structure, and the fixing member 15 fixes the piston 7. Both the inner and outer walls of the piston 7 are provided with sealing rings, which achieves the sealing of the upper and lower chambers of the piston 7.

[0028] One end of the cylinder 3 is internally provided with a clamping sleeve 13, the inside of the clamping sleeve 13 is provided with a second sealing ring 12, and the piston rod 6 extends from the clamping sleeve 13, and the sealing between the cylinder 3 and the piston rod 6 is realized through the second sealing ring 12.

[0029] The internal threaded part 14 is provided with a through hole, through which the hydraulic oil in the cavity inside the piston rod 6 can smoothly enter and exit during the operation of the piston rod 6.

[0030] The two end sides of the cylinder 3 are respectively provided with a first oil port 4 and a second oil port 5, when the first oil port 4 supplies oil and the second oil port 5 discharges oil, that is, the piston rod 6 extends, the first oil port 4 discharges oil and the second oil port 5 supplies oil, that is, the piston rod 6 retracts.

[0031] The technical means disclosed in the scheme of the present application is not limited to the technical means disclosed in the above-mentioned embodiments, but also includes the technical solutions composed of any combination of the above technical features.

Claims

1. A hydraulic transmission apparatus characterized by comprising: Including cylinder (3), the inside of cylinder (3) is provided with piston rod (6), the hollow of piston rod (6) is provided, and the front end extends out of cylinder (3), and the rear end side wall of piston rod (6) is provided with piston piece (7); The lower end of cylinder (3) is fixedly connected with driving motor (1), the output end of driving motor (1) is fixedly connected with screw rod (8), and screw rod (8) extends to the inside of piston rod (6), the tail end inside of piston rod (6) is fixedly connected with internal thread piece (14), internal thread piece (14) is penetrated by screw rod (8) and is threadedly self-locked with it.

2. A hydraulic transmission device according to claim 1, characterised in that: The lower end of cylinder (3) is provided with connecting plate (2), and driving motor (1) is fixedly connected on connecting plate (2).

3. A hydraulic transmission device according to claim 2, characterised in that: The upper end of connecting plate (2) is provided with convex sleeve (10), screw rod (8) is penetrated from the middle part of convex sleeve (10), the inside of convex sleeve (10) is provided with first sealing ring (9), the upper side of first sealing ring (9) is provided with buckling piece (11), and buckling piece (11) and the inner wall of convex sleeve (10) are threadedly connected.

4. A hydraulic transmission device as claimed in claim 1, wherein: The tail end of piston rod (6) is threadedly connected with fixing piece (15), fixing piece (15) is arranged against piston piece (7), and the inner and outer walls of piston piece (7) are provided with sealing rings.

5. A hydraulic transmission device as claimed in claim 1, wherein: One end inside of cylinder (3) is provided with embracing sleeve (13), the inside of embracing sleeve (13) is provided with second sealing ring (12), and piston rod (6) extends from embracing sleeve (13).

6. A hydraulic transmission device as claimed in claim 1, wherein: The through hole is arranged on internal thread piece (14).

7. A hydraulic transmission device as claimed in claim 1, wherein: The side walls of both ends of cylinder (3) are respectively provided with first oil port (4) and second oil port (5).

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