JP2018066466A - Oscillation and rotation type vane actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a conventional oscillation vane type pump actuator can be used only at low temperature because of incomplete sealing for hydraulic oil, so that it is difficult to downsize the oscillation vane type pump actuator.SOLUTION: Proposed is an oscillation and rotation type vane actuator using a spherical cylinder, which is also used as a spherical case. A stationary vane fixed to a spherical surface of the cylinder, slides to a rotor having a trunk outer peripheral surface having the same arc shape as the spherical cylinder, through a single arc-shaped seal, and a rotor vane also slides to the spherical surface of a cylinder inner surface through a single arc-shaped seal, so that a new machine is proposed, whose improved pressure resistance is higher than conventional ones, sealability of hydraulic oil can be enhanced, and contour can be downsized. As one of applications, a steering gear for a ship is appropriate.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a large-torque oscillating hydraulic actuator that can be applied to a ship steering apparatus.

  Hydraulic cylinders are extremely reliable as linear motion actuators. For this reason, even in the field of oscillating and rotating actuators, there are many cases where cylinders and gears, cylinders and links, and the like are combined. The marine vessel steerer area is a representative example of dealing with a combination of a cylinder and a link. For this reason, the latest high-speed steering response cannot be handled while occupying a large wheelhouse. The key to the solution is to improve the vane actuator structure and sealing technology.

  Problems of the conventional vane actuator shown in FIG. 1 will be described. The problems encountered when using the actuator shown in FIG. 1 will be described. In the illustrated actuator, two fixed vanes 4 are fixed to the inner surface of a cylindrical case 1 having an inner diameter of 800 mm by bolts, and the rotor 5 having an outer diameter of 530 mm is provided with two swing vanes 6. The interior of the case is divided into four rooms. It is a basic operation of the swing vane actuator that the four chambers fluctuate due to the swing of the rotor 5.

  The problems of this conventional swing vane actuator will be described. The first problem is deformation of the cylindrical case 1 having an inner diameter of 800 mm when pressure is applied. When high pressure is applied to the working chamber located 180 degrees symmetrical from the center line of the swing shaft 7, the cylinder is deformed into an elliptical shape, and its direction and size are not fixed. The gap between the sliding parts is desired to be about 10 microns, but changes to about minus 10 to plus 150 microns, which is usually difficult to cope with a seal.

  A metal seal is attached to the vane tip and both side surfaces of the rotor vane 6 in FIG. Since the seal shape is discontinuous, it is a combination of multiple seals. The locations where the separate seal parts are adjacent to each other are as close as possible and “gap = 0” as much as possible. However, due to hydraulic oil leakage from the gap portion, the sealing action itself becomes unstable, resulting in a malfunction over the entire length of the seal, which tends to develop explosive oil leakage. Then the actuator function becomes zero.

  Conventional oscillating vane actuators are prone to oil leaks where multiple seal parts contact. The problem to be solved by the present invention is to realize an oscillating vane type hydraulic actuator having improved pressure resistance by using a simple seal as a main seal.

  In order to solve this problem, in the present invention, in order to make the actuator body and the seal part as smooth as possible and to be configured with a small number of parts, an arc shape is frequently used. Seal parts were completed with one part for one place.

  The seal uses hydraulic pressure acting on the seal itself to block the flow at the high and low pressure boundaries. There is a control function that minimizes the sum of the friction loss of seal sliding and the leakage loss of high-pressure oil. For this reason. Pressure disturbance around the seal that makes the seal operation unstable is prohibited. In particular, be careful not to let the pressure oil flow out to the low pressure side through the groove where the seal enters. The actuator shown in FIG. 2 takes this into consideration.

  The sealing operation of the sliding surface is realized by automatically correcting the seal so that the seal is deformed following the deformation of the sliding surface and no gap is generated on the sliding surface. A typical seal is a piston ring, but the clearance between the circular cylinder and the piston is corrected by automatic dimension correction of the piston ring. The seal used in the device of the present invention corresponds to a part of the piston ring, but in the present invention, the seal provided at the tip of the fixed / oscillating vane is the main seal, and includes a spherical inner cylinder and an arcuate spherical surface. It slides on the outer surface of the rotor body. For this seal, a circularly processed seal is cut into a predetermined size and used.

  In the present invention, spherical shaped parts have been widely used in recent years, and the processing technology for creating spherical shapes has also become widespread. did. If the container to which pressure is applied becomes a sphere, the volume and weight of the entire apparatus will be at the lowest level, and it will be easy to manufacture, assemble and handle.

  Internal view of a conventional rotary vane pump / actuator viewed from the axial direction   A perspective view of the oscillating vane type actuator of the present invention in which a quarter of the spherical cylinder is cut and the rotor portion is omitted to illustrate the inside of the cylinder.   Sectional view of the actuator of the present invention, in which a spherical cylinder is cut in the direction perpendicular to the axial center line   Cross section of spherical cylinder joint surface viewed from the axial direction

  As shown in FIG. 2, the inside of the case 51, which is the main component, is a spherical space. Compared to the conventional type with the same working chamber volume, the case surface area is minimal and the impression of miniaturization is stronger.

In this spherical space, a rotor 55 having two vanes 56 shown in FIG. 4 is supported in a rotatable state by shafts 57 supported by bearings at two locations of the case 51. The outer peripheral surface of the body of the rotor 55 has substantially the same arc shape as the spherical inner cylinder of the case 51. The two fixed vanes 54 fixed to the inner surface of the case 51 and the swing vane 56 on the rotor side form four sealed spaces, and when the shaft 57 rotates, the tip of the fixed vane 54 is connected to the rotor 55. Since the front end of the rotor vane 56 slides along the spherical surface of the case 51, the volume of the four sealed spaces smoothly increases and decreases. If the increase side and the decrease side are separated and connected to an external circuit, a relationship between the mechanical shaft rotation and the fluid flow associated therewith is created.

  The conventional oscillating vane pump / actuator shown in FIG. 1 has a problem in that the seal line where the sliding gap exists is discontinuous. For this reason, the seal is divided and a gap is formed in the divided portion, and it is not possible to prevent leakage. Rubber seal parts have been studied, but the pressure resistance is insufficient and the operating pressure has been lowered, and the seals have to be replaced frequently by field work.

  On the other hand, in the present invention, the seal sliding surfaces are the spherical surface of the cylinder and the cylindrical surface of the rotor 55 that rotates an arc on the axis. Since the seal to be inserted here has an arc shape with a constant curvature and no division, the production method first creates a circular link and cuts it into a predetermined dimension. Precision machining is easy. Therefore, it becomes possible to manufacture a hydraulic pump / actuator excellent in sealing performance and durability.

51 Case also serving as a spherical inner cylinder 54 Fixed vane 55 Rotor 56 Rotor vane 57 Rotating shaft for output

Claims (2)

  Spherical parts divided into two parts, which have been processed into an accurate spherical surface in advance, are joined together with a large number of bolts to form a spherical cylinder, and the vane rotor is connected to the central axis in the cylinder. The bearings are inserted so that they match, and bearings are supported to support the bearings at two central parts of the cylinder, while two fixed vanes that are tightly fixed to the inner surface of the cylinder and two vanes that are integral with the rotor are located inside the spherical cylinder. The vane tip fixed to the cylinder is slid with the outer peripheral surface of the rotor body having an arc outer surface smaller than the arc inner surface of the cylinder by the thickness of the seal. An oscillating rotary vane actuator having a spherical inner surface with high sealing performance and high manufacturing efficiency by attaching an arc-shaped seal to the tip of the moving vane.   Cylinder vanes and rotor vanes are each configured to be a part of a circular arc, and one seal corresponds to one vane, providing a highly reliable seal that reliably improves sealing and pressure resistance. Equipped with oscillating rotary vane actuator.

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