KR20130005364A

KR20130005364A - A rotary cylinder

Info

Publication number: KR20130005364A
Application number: KR1020110066703A
Authority: KR
Inventors: 김동선
Original assignee: 김동선
Priority date: 2011-07-06
Filing date: 2011-07-06
Publication date: 2013-01-16

Abstract

The present invention relates to a rotary cylinder, and an object thereof is to provide a rotary cylinder that can implement an easy intermediate stop function and a swing angle of 360 degrees or more.

The present invention provides a body (1) having a stroke distance equal to or greater than that of a screw thread, a rod cover (2) coupled to the body by bolts, and a cover disc (71) coupled to the rod cover by bolts; And a spline shaft (73) inserted into the cover disc and coupled to the spline hole (34), the drive shaft (7) having the projection (72), and fixedly coupled to the body by a coupling disc (41) integrated with the male screw shaft. Integral with the threaded portion consisting of a male screw shaft 4 and a female screw portion 33 of the piston rod coupled to the male screw shaft, and a piston rod 31 and 32 coupled to the body and the rod cover and having a female screw portion and a spline hole. And a piston 3 with a packing groove 35.

The rotary cylinder according to the present invention can create a swing angle of 360 degrees or more by giving a stroke length larger than the lead of the screw portion, and can maintain an intermediate stop for a long time even under a load state by applying a back pressure using an external control device. .

Rotary cylinder, u. Pneumatic, cylinder, screw, lead angle

Description

Rotary Cylinder {A Rotary Cylinder}

The present invention relates to a rotary cylinder, and more particularly to a rotary cylinder that can implement the intermediate stop function and the swing angle by using a screw formed inside the piston rod.

In general, rotary cylinders are classified into vane type and jack-pinion type according to the driving method.

This vane type rotary cylinder has a swing angle of 280 degrees or less, and may cause an internal leakage problem. As a result, it is not only difficult to maintain the intermediate position stop for a long time under load,

There must be a special packing to wrap the entire corner of the square vanes with rounded corners, and there must be a precise cylinder tube that conforms to the curved shape of the packing.

The following jack-pinion type rotary cylinder has the advantage of low leakage and intermediate stop for a long time. However, the swing angle is limited by the length of the jack. If the swing angle exceeds 360 degrees, problems with the strength and processing accuracy of the jack may occur. In addition, it is difficult to implement the intermediate stop function in the rotary cylinder of the complex structure that converts the linear motion into the rotational motion, and there is a disadvantage that the volume of the rotary cylinder must be large.

The present invention has been made to solve the above problems, an object of the present invention is to provide a rotary cylinder that can implement an easy intermediate stop function and a swing angle of 360 degrees or more by using a screw formed in the piston rod. have.

Rotary cylinder according to the present invention to achieve the above object is

A body 1 having rod stroke 51, bushing 54 and port 62 having a stroke length equal to or greater than the lead of the male and female threads of the thread, and having an end cover and a cylinder tube integrated therein; ; A rod cover (2) having a rod packing (52), a bushing (53) and a port (61) coupled to the body by bolts to determine the position of the piston stroke together with the body;

A cover disc 71 coupled to the rod cover by bolts to support the drive shaft inserted therein;

A drive shaft (7) inserted into the cover disc and having a spline shaft (73) coupled to the spline hole (34) and a ring-shaped protrusion (72) to transmit the rotational force of the piston to the propeller;

A female screw portion 33 formed in the piston rod and a male screw shaft 4 coupled to the female screw portion in a state of being fixedly coupled to the body by an integrated coupling disc 41 to move the piston forward under pressure. A screw unit for converting the rotary motion;

It is coupled to the body and the rod cover, characterized in that it consists of a piston (3) having a packing groove (35) and integral with the piston rods (31, 32) having a female screw portion (33) and a spline hole (34). do.

As described above, the rotary cylinder according to the present invention can create a swing angle of 360 degrees or more by giving a stroke length larger than the lead of the threaded portion, and when the back pressure is applied by using an external control device, the intermediate cylinder is stopped for a long time even under load. Can be maintained.

In addition, the cross-sectional area of the cylinder can be made relatively larger than that of the rotary cylinder of the vane or rack-pinion type, and thus, a high rotational force can be obtained.

The present invention will now be described in detail with reference to the accompanying drawings.

1 is a partial cutaway perspective view showing the structure of a rotary cylinder according to the present invention;

Figure 2 is a half cross-sectional view showing the structure of the piston of the rotary cylinder according to the present invention of FIG.

As shown in Figures 1 and 2, the rotary cylinder according to the present invention to implement an easy intermediate stop function, and to implement a swing angle of 360 degrees or more,

Body 1; A rod cover 2 coupled to the body; A cover disc 71 coupled to the rod cover;

A piston (3) integrated with the piston rods (31, 32) having a female thread portion (33) and a spline hole (34) and having a packing groove (35); A screw portion consisting of a female screw portion and a male screw shaft;

It consists of a spline shaft 73 coupled to the spline hole and a drive shaft 7 with a projection 72.

The body 1 is a cylinder tube for guiding the movement of the piston and the end cover installed at one end of the cylinder tube is combined and integrated,

A piston rod supporting the piston rod, and having a port 62 for inputting and outputting air or hydraulic oil into the cylinder, the bushing 54 and the rod packing 51 are mounted in a hole drilled in the center of the end cover.

In addition, the body is characterized in that it has a stroke length of the piston equal to or greater than the lead (lead) which is the distance advancing in the axial direction when the female screw portion coupled to the fixed male screw one rotation.

The rod cover 2 is coupled to one end of the body using a bolt 82 to support the piston rod to determine the stroke distance of the piston and form a sealed space.

The rod cover has a port 61 for inputting or outputting air or hydraulic oil into the cylinder; O-ring 55 is inserted into the O-ring groove to prevent air or oil from leaking from the joint between the body and the rod cover, and the piston rod bushing 53 and the rod packing 52 are mounted in a hole drilled in the center. It is done.

The cover disc 71 serves to prevent the drive shaft from being pushed to the right while supporting the spline shaft of the drive shaft inserted and coupled to the rod cover using the bolt in a rotatable state.

The piston (3) is assembled inside the body and is integrated with the left and right piston rods (31, 32) to slide under pressure in the cylinder tube of the body,

A piston packing 5 inserted into a packing groove 35 formed on an outer circumferential surface of the piston to prevent airtightness and leakage of air or hydraulic oil; A female screw portion 33 formed on an inner surface of one side of a hole drilled in the center of the piston rod; It is characterized in that it comprises a spline hole 34 formed on the inner surface of the other side.

The drive shaft 7 is supported by the male shaft and the cover disc in a state capable of rotation without being pushed left and right, and a spline shaft 73 for converting forward movement as the piston rotates into pure rotational force and providing it to the propeller. And a projection 72.

The spline shaft 73 is a shape in which a plurality of key-shaped protrusions are axially coupled to the circumferential surface of the shaft and coupled to the spline hole to receive pressure, and thus the spline hole of the piston rotates forward. Function to take.

The ring-shaped protrusion 72 doubles with the cover disc 71 and serves to prevent the spline shaft from being pushed to the right while rotating.

The screw portion forming the main portion of the present invention,

A female screw portion 33 formed in the piston rod, and a male screw shaft 4 coupled to the female screw portion in a state in which the bolt 81 is fixed to the body by an integrated coupling disc 41,

The female thread unit integrated with the piston to move forward under pressure performs a forward movement while rotating by a fixed male shaft.

The rotational force thus generated is easily generated only when the female thread coupled to the male shaft is released as a self-standing condition of the screw, that is, when the lead angle of the combined male thread and the female thread is larger than the friction angle of the screw.

Therefore, if the stroke length of the piston is equal to or larger than the lead of the thread corresponding to the lead angle larger than the friction angle, the swing angle of 360 degrees or more can be realized.

In addition, in order to facilitate the manufacture of the female threaded portion, the length of the female threaded portion should be as short as possible, and the rigidity of the female threaded portion shortened should be increased. For this purpose, if the number of threads of the screw is more than two lines, it is possible to improve the ease of manufacture and rigidity.

The rotary cylinder according to the present invention uses the external control device to apply the same pressure to the discharge port as the port into which the air or hydraulic oil is input, that is, when the back pressure is applied, the piston can be stopped at an arbitrary position. Using this function, it is possible to stop for a long time under load under the desired swing angle through the control device.

As shown in Figure 2, the packing groove 35 of the piston is characterized in that formed in the shape of a large cycle period on the circumferential surface of the piston.

This corrugated packing groove maintains a constant angle of inclination with respect to the packing to which the tangential rotational forces perpendicular to the forward and forward forces of the piston are simultaneously applied, thereby increasing the distribution and offset of the force to minimize packing phenomena. The function of preventing deformation and wear of the packing can be realized.

As another embodiment, when the spline shaft is fixed, and the male shaft is coupled to the female threaded portion of the piston rod in a state capable of rotating,

The piston, which is pressurized by the spline hole coupled to the fixed spline shaft, can perform a rotary cylinder in which the male shaft rotates by the female screw portion of the piston rod which moves forward only and moves forward.

1 is a partial cutaway perspective view showing the structure of a rotary cylinder according to the present invention.

Figure 2 is a half sectional view showing the structure of a piston of the rotary cylinder according to the present invention of Figure 1;

1: body 2: rod cover

3: piston 31,32: piston rod

33: female thread portion 34: spline hole

35: packing groove

4: male shaft 41: coupling disc

5: piston packing 51, 52: rod packing

53,54 bushing 55: O-ring

61,62: port 7: drive shaft

71: cover disc 72: projection

73: spline shaft 81,82: bolt

Claims

A body 1 having a stroke distance equal to or greater than that of the threaded lead;

A rod cover 2 coupled to the body by a bolt;

A cover disc 71 coupled to the rod cover by bolts;

A drive shaft 7 having a spline shaft 73 and a projection 72 inserted into the cover disc and coupled to the spline hole 34;

A screw portion comprising a male screw shaft 4 fixedly coupled to the body by a coupling disk 41 integrated with the male screw shaft, and a female screw portion 33 of the piston rod coupled to the male screw shaft;

A rotary cylinder coupled to the body and the rod cover, comprising a piston (3) having a packing groove (35) integrated with a piston rod (31,32) having a female thread portion and a spline hole.

The method of claim 1,

The piston is a rotary cylinder, characterized in that the female screw portion (33) is formed inside one end of the hole drilled in the center of the integrated piston rod, the spline hole (34) is formed inside the other end.