JP6120706B2 - Rotary vane steering actuator ground seal device - Google Patents

Description

  The present invention relates to a rotary vane type steering machine, and more particularly to a gland seal device for an actuator.

  An actuator 10 of a conventional rotary vane type steering machine is, for example, as shown in FIGS. 4 to 6, and includes a housing 11 and a rotor 12 that is housed in the housing 11 and rotates.

  In the radial direction, the rotor 12 is arranged such that the lower shaft portion 12a is supported by a boss portion 11a provided at the bottom portion of the housing 11 via a radial bearing 14a, and the upper shaft portion 12b closes the upper opening of the housing 11. An annular top cover 13 is supported via a radial bearing 14b. In the axial direction, the lower end surface of the rotor 12 is supported on the inner bottom surface of the housing 11 via a thrust bearing 14c.

  The rotor 12 has an internal through-hole 12c into which the shaft head 17a of the rudder shaft 17 is inserted and tightened, and n pieces (n is 1 or more) at equal intervals along the circumferential direction of the outer peripheral surface. A number of vanes 12d, where n = 2), are provided.

The housing 11 is provided with the same number of segments 11b as the vanes 12d protruding at equal intervals along the circumferential direction of the inner peripheral surface.
As shown in FIGS. 5 and 6, each vane 12 d of the rotor 12 holds an upper horizontal seal 12 f slidably contacting the back surface of the top cover 13 in an upper horizontal slit 12 e formed on the upper end surface, and is formed on the lower end surface. The lower horizontal seal 12h that is in sliding contact with the inner bottom surface of the housing 11 is held in the lower horizontal slit 12g, and the vertical seal 12j that is in sliding contact with the inner peripheral surface of the housing 11 is placed in the vertical slit 12i formed in the distal end surface in the radial direction. keeping.

  As shown in FIGS. 5 and 6, the segment 11 b of the housing 11 holds a vertical seal 11 d slidably contacting the outer peripheral surface of the rotor 12 in a vertical slit 11 c formed on the distal end surface in the radial direction. Each of the seals 12f, 12h, 12j, and 11d is formed of an elastic material such as a polymer.

  Note that the cross-sectional shapes of the upper horizontal seal 12f, the lower horizontal seal 12h, the vertical seal 12j, and the vertical seal 11d of the segment 11b, which are linear seals, are as shown in FIG.

  In the housing 11, the upper and lower horizontal seals 12 f and 12 h of the vane 12 d are in sliding contact with the back surface of the top cover 13 and the inner bottom surface of the housing 11, and the vertical seal 12 j is in sliding contact with the inner peripheral surface of the housing 11. The rotor 12 rotates in a state where the outer peripheral surface of the rotor 12 is in sliding contact with the vertical seal 11 d of the segment 11 b of the housing 11.

Thereby, the oil chamber space 15 formed around the outer side of the rotor 12 is partitioned into hydraulic oil chambers 15a, 15b, 15c, and 15d by the vanes 12d and the segments 11b.
As shown in FIGS. 5, 6, and 8, the top cover 13 has an annular upper ring seal in an upper ring slit 13 a formed over the entire circumference in a portion of the upper end surface of the rotor 12 that faces the outer circumferential surface. 13b is held. As shown in FIGS. 5, 6, and 9, the housing 11 includes an annular lower ring seal 11 f in a lower ring slit 11 e formed over the entire circumference in a portion facing the outer circumferential surface of the lower end surface of the rotor 12. keeping. The upper and lower ring seals 13b and 11f are each formed of an elastic material such as a polymer. The cross-sectional shapes of the upper and lower ring seals 13b and 11f are as shown in FIG.

  As shown in FIG. 8, the ring seal surface 13c of the upper ring seal 13b is in contact with the radial end edge of the upper end surface of the rotor 12 over the entire circumference, and the outer peripheral edge portion 13d of the ring seal surface 13c is the vane 12d. The inner peripheral upper end edge 12k of the upper horizontal seal 12f and the inner peripheral upper end edge 11h of the vertical seal 11d of the segment 11b are in contact with each other.

  As shown in FIG. 9, the lower ring seal 11f is similar to the upper ring seal 13b in that the ring seal surface 11g is in contact with the radial edge of the lower end surface of the rotor 12 over the entire circumference, and the ring seal surface 11g The outer peripheral edge 11i is in contact with the inner peripheral lower end edge 12m of the lower horizontal seal 12h of the vane 12d and the inner peripheral lower end edge 11j of the vertical seal 11d of the segment 11b.

  As a result, the hydraulic oil in each of the hydraulic oil chambers 15a, 15b, 15c, 15d is prevented from leaking. That is, through a minute gap between the upper end surface of the rotor 12 and the back surface of the top cover 13, through the outer peripheral side surfaces of the upper ring slit 13a and the lower ring slit 11e, or the upper portion of the vane 12d and From the upper and lower inner peripheral edge portions 12k, 12m of the lower horizontal seals 12f, 12h and the upper and lower inner peripheral edge portions 11h, 11j of the vertical seal 11d of the segment 11b, from the hydraulic oil chamber on the high pressure side The pressure oil is prevented from leaking into the adjacent hydraulic oil chamber on the low pressure side.

  The hydraulic oil chambers 15a and 15c and the hydraulic oil chambers 15b and 15d, which are at positions opposite to the rotation axis of the rotor 12, are in communication with each other. For this reason, for example, when the hydraulic oil is supplied to the hydraulic oil chamber 15a from the hydraulic pump, the hydraulic oil is simultaneously supplied to the hydraulic oil chamber 15c at the counter electrode position, while the remaining hydraulic oil chambers 15b and 15d At the same time, the oil is discharged and returned to the hydraulic pump side. Thereby, rotation of the rotor 12 by pressure oil is materialized.

  The upper horizontal seal 12f, the lower horizontal seal 12h, the vertical seal 12j of the vane 12d of the rotor 12, the vertical seal 11d of the segment 11b of the housing 11, the lower ring seal 11f of the housing 11, and the upper ring seal 13b of the top cover 13 are: In order to enhance the sealing effect between the contact surfaces with which they contact and slide, the hydraulic oil chambers (15a, 15c or 15c) on the high pressure side are provided on the back surfaces of the respective seals 12f, 12h, 12j, 11d, 11f, 13b. 15b, 15d) pressure oil is guided, and the respective oil pressure is pressed against the mating surface by the oil pressure.

  There are various methods for guiding the pressure oil from the hydraulic oil chamber (15a, 15c or 15b, 15d) on the high pressure side to the back surface of each seal 12f, 12h, 12j, 11d, 11f, 13b. A method which is a background art of the present invention will be described below.

  As shown in FIG. 15, hydraulic lines 16a communicating with the hydraulic fluid chambers 15a and 15c and 15b and 15d communicating with each other are provided outside the actuator 10, and a pressure valve 16 is provided on each hydraulic line 16a. By providing, the hydraulic oil in the hydraulic oil chambers 15 a and 15 c (or 15 b and 15 d) on either high pressure side is extracted through the pressure valve 16.

  The extracted working pressure oil communicates with the ring-shaped rotor upper surface oil groove 12n provided on the upper end surface of the rotor 12 through the oil passage 13e penetrating the top cover 13, as shown in FIGS. Through the oil passage 13f branched from the oil passage 13e penetrating the top cover 13, it communicates with the back surface of the vertical seal 11d of the housing segment 11b.

  The rotor upper surface oil groove 12 n provided on the upper end surface of the rotor 12 communicates with the back surface of the upper ring seal 13 b via an oil groove 13 g provided on the inner peripheral side surface of the upper ring slit 13 a of the top cover 13.

  A ring-shaped rotor lower surface oil groove 12o is provided on the lower end surface of the rotor 12, and this is communicated with the rotor upper surface oil groove 12n through a balance hole 12p that vertically penetrates the rotor 12 from the upper end surface to the lower end surface. The lower surface oil groove 12o of the rotor 12 communicates with the back surface of the lower ring seal 11f via an oil groove 11k provided on the inner peripheral side surface of the lower ring slit 11e. Further, as shown in FIG. 10, an oil passage 12q that communicates from the rotor upper surface oil groove 12n to the back surface of the vertical seal 12j of the rotor vane 12d is provided.

  In the above configuration, the working pressure oil led to the oil groove 13g provided on the inner peripheral side surface of the upper ring slit 13a and the working oil chambers 15a, 15c (or 15b, 15d) on the high pressure side are the upper parts. As a means for preventing the operating pressure oil leaking beyond the seal surface 13c of the ring seal 13b from leaking outside through the through hole 13h of the top cover 13 that is loosely fitted to the upper shaft portion 12b of the rotor 12, FIG. As shown in FIG. 1, an upper ground seal device 13 is provided.

  Similarly, in the lower part, the working pressure oil introduced into the oil groove 11k on the inner circumferential side surface of the lower ring slit 11e and the working pressure on the high pressure side leaked beyond the seal surface 11g of the lower ring seal 11f. As a means for preventing oil from leaking outside through the through hole 11m of the boss portion 11a at the bottom of the housing 11 that is loosely fitted to the lower shaft portion 12a of the rotor 12, as shown in FIG. 11n is provided.

  Various types of upper ground seal device 13i and lower ground seal device 11n are used. For example, as a “0” ring, there is a ring in which a main ring and a secondary ring provided in case of leakage from the main ring are overlapped. However, as the hydraulic oil design pressure increases, sealing becomes difficult with a double ridge configuration of "0" rings.

  For this reason, in the conventional ground seal device, as shown in FIGS. 13 and 14, lip-shaped ground packings are provided in doubles of a main and a sub, and the main ground packing mainly performs a sealing action. Yes. Both are used in series so that the secondary ground packing performs a secondary sealing action when there is leakage from the main ground packing or when the main ground packing is damaged.

  This will be described below with reference to FIGS. As shown in FIG. 13, the upper ground seal device 13 i includes an upper main ground packing 13 j and an upper sub-ground packing 13 k made of an elastic material on the outer peripheral surface of the upper shaft portion 12 b of the rotor 12. In FIG. The upper main ground packing 13j is held in an upper main ground packing groove 13m provided on the inner peripheral surface of the through hole 13h of the top cover 13, and the upper sub-ground packing 13k is an upper ground packing press 13n with respect to the upper main ground packing 13j. Is held in the upper sub-ground packing groove 13o provided on the inner peripheral surface of the upper sub-ground.

  The upper main ground packing 13j includes a ring-shaped base portion 13ja, a ring-shaped outer lip 13jb that protrudes downward from the outer peripheral end portion of the base portion 13ja, and a ring-shaped protrusion that protrudes downward from the inner peripheral end portion of the base portion 13ja. It consists of an inner lip 13jc. In the free state, the distal end portion of the outer lip 13jb projects a predetermined amount outside the outer peripheral surface of the base portion 13ja, and the distal end portion of the inner lip 13jc projects a predetermined amount inside the inner peripheral surface of the base portion 13ja.

  In a state where the upper main ground packing groove 13j is mounted in the upper main ground packing groove 13o, the tip end portion of the outer lip 13jb is displaced in the inner peripheral direction, and a predetermined gap is formed between the outer main wall packing groove 13m and the outer peripheral side wall surface. A contact surface pressure is generated, and the tip portion of the inner lip 13jc is displaced in the outer peripheral direction, and a predetermined contact surface pressure is generated between the outer surface of the upper shaft portion 12b of the rotor 12.

  The upper sub-ground packing 13k has a cross-sectional shape similar to that of the upper main ground packing 13j. When the upper sub-ground packing 13k is mounted, the outer lip 13ka has an outer periphery of the upper sub-ground packing groove 13o. A predetermined contact surface pressure is generated between the inner side lip 13 kb and the outer peripheral surface of the upper shaft portion 12 b of the rotor 12 at the front end portion of the inner lip 13 kb.

  As shown in FIG. 14, the lower ground seal device 11 n has a lower main ground packing 11 o and a lower sub-ground packing 11 p made of an elastic material, respectively, on the outer peripheral surface of the lower shaft portion 12 a of the rotor 12. The configuration is arranged in series in the direction.

  The lower main ground packing 11o is held in a lower main ground packing groove 11q provided on the inner peripheral surface of the boss portion 11a at the bottom of the housing 11, and the lower sub-ground packing 11p is a lower ground with respect to the lower main ground packing 11o. It is held in the lower secondary ground packing groove 11s provided on the inner peripheral surface of the packing presser 11r.

  The lower main ground packing 11o has the same cross-sectional shape as the upper main ground packing 13j, and the lower sub-ground packing 11p has the same cross-sectional shape as the upper sub-ground packing 13k. The lower main ground packing 11o is disposed symmetrically with the upper main ground packing 13j in the vertical direction, and the lower secondary ground packing 11p is disposed symmetrical with the upper sub ground packing 13k in the vertical direction.

  In a state where the lower main ground packing 11o is mounted, a predetermined contact surface pressure is generated between the front end portion of the outer lip 11oa and the outer peripheral side wall surface of the lower main ground packing groove 11q, and the front end portion of the inner lip 11ob and the rotor 12 A predetermined contact surface pressure is generated between the lower shaft portion 12a and the outer peripheral surface.

  In a state where the lower secondary ground packing 11p is mounted, a predetermined contact surface pressure is generated between the distal end portion of the outer lip 11pa and the outer peripheral side wall surface of the lower secondary ground packing groove 11s, and the distal end portion of the inner lip 11pb and the rotor 12 A predetermined contact surface pressure is generated between the lower shaft portion 12a and the outer peripheral surface.

  The circuit of the hydraulic device 20 that operates the actuator 10 of the above rotary vane type steering machine is, for example, as shown in FIG. The main elements constituting the hydraulic circuit are a hydraulic pump 21, a steering direction switching valve 22 and an electromagnetic valve 23 that drives the hydraulic pump 21, a steering side and surface steering side pilot check valves 24p, 24s, a steering side and surface steering side flow rate adjustment valve 25p, 25 s, a steering side main hydraulic line 27 p and a surface rudder side main hydraulic line 27 s that connect the actuator 10 to the outlet of the oil tank 26 and the direction switching valve 22. In addition, the system which produces the control hydraulic pressure for operating the steering direction switching valve 22 from the independent control oil pump 29 is employ | adopted.

  The hydraulic pump 21 is a one-way constant discharge amount type, and the steering direction switching valve 22 switches the flow path between when the actuator 10 is rotated to the rudder side and when it is rotated to the rudder side by the discharge oil from the hydraulic pump 21. Do. The hydraulic oil after actuating the actuator 10 passes through the steering direction switching valve 22 and returns from the return line 30 to the oil tank 26 through the return filter 31. The steering direction switching valve 22 also functions to return the oil discharged from the hydraulic pump 21 to the oil tank 26 through the steering direction switching valve 22 when the actuator 10 is not operated.

  The steering side pilot check valve 24p and the surface steering side pilot check valve 24s open the main hydraulic lines 27p and 27s when the actuator 10 is operated, that is, when hydraulic pressure is generated in the oil discharged from the hydraulic pump 21, When the actuator 10 is not operated, a non-return action is performed to confine the hydraulic oil in the hydraulic oil chambers 15a, 15b, 15c, and 15d of the actuator 10, and the shaft head 17a of the rotor 12, that is, the rudder shaft 17 is fixed.

  Thus, the steering-side flow rate adjustment valve 25p and the front-side flow rate adjustment valve 25s provide resistance to the main hydraulic line 27p or 27s on the return side of the hydraulic oil from the actuator 10, that is, the return side to the oil tank 26. Thus, the movement of the actuator 10 is smoothed.

  The adjacent hydraulic oil chambers 15a, 15d and 15b, 15c of the actuator 10 are connected by the anti-shock valves 28p, 28s, respectively, and the hydraulic oil chambers 15a, 15b, 15c, 15d are connected by the pilot check valves 24p, 24s. When the lock is locked, if an abnormally large force acts on the rudder, the anti-impact valve 28p or 28s acts to operate the hydraulic oil in the hydraulic oil chambers 15a, 15c or 15b, 15d on the high pressure side on the low pressure side. The oil chambers 15b and 15d or 15a and 15c are allowed to escape.

  In order to guide the hydraulic oil in the hydraulic oil chambers 15a, 15c (or 15b, 15d) on the high pressure side to the back of each seal of the actuator 10 through the through oil passage 13e of the top cover 13, The hydraulic line 16a to the pressure valve 16 outside the machine of the actuator 10 is provided so as to communicate with the respective inlets of the anti-shock valves 28p and 28s.

Japanese Patent No. 4514617

  The upper ground seal device 13i and the lower ground seal device 11n of the actuator 10 of the rotary vane steering gear having the above-described configuration are composed of main ground packings 13j and 11o and sub ground packings 13k and 11p, respectively.

  As explained in the section of the background art, the working pressure oil led from the working oil chambers 15a, 15c (or 15b, 15d) on the high pressure side to the oil groove 13g on the inner peripheral side surface of the upper ring slit 13a, and The hydraulic oil leaked beyond the seal surface 13c of the upper ring seal 13b passes through the gap between the upper shaft portion 12b of the rotor 12 and the through hole 13h of the top cover 13 loosely fitted thereto, and the upper main ground packing. 13j enters between the outer lip 13jb and the inner lip 13jc.

  Then, by the hydraulic pressure, the outer lip 13jb is pressed against the outer peripheral side wall surface of the upper main gland packing groove 13m to prevent leakage of hydraulic oil from this portion, and the inner lip 13jc is moved to the upper shaft portion 12b of the rotating rotor 12. It is pressed against the outer peripheral surface of the plate to perform the sealing action.

  As a result, the inner lip 13jc, which is the sliding portion of the upper main gland packing 13j, is always in contact with the hydraulic oil, so there is no problem of lubrication for the sliding portion. However, as the sealing action by the upper main ground packing 13j is complete, the working pressure oil is blocked by the upper main ground packing 13j.

  For this reason, the phenomenon that hydraulic fluid does not reach the sliding portion between the inner lip 13kb of the upper sub-ground packing 13k and the outer peripheral surface of the rotor upper shaft portion 12b occurs. Accordingly, the sliding portion is slid without lubrication, and there is a problem that the upper sub-ground packing 13k is burned out or damaged. The same applies to the lower sub-ground packing 11p.

  Or, conversely, the working pressure oil leaked from the upper main ground packing 13j (or lower main ground packing 11o) is the inner lip 13kb (or 11pb) and outer lip 13ka of the upper sub ground packing 13k (or lower sub ground packing 11p). If it repeatedly enters into the space between (or 11 pa), the pressure accumulation phenomenon occurs in the space.

  As a result, the sliding contact surface pressure between the inner lip 13kb (or 11pb) of the upper sub ground packing 13k (or lower sub ground packing 11p) and the upper shaft portion 12b (or lower shaft portion 12a) of the rotor 12 is excessive. Therefore, there was a problem that the inner lip 13 kb (or 11 pb) was burned out or damaged.

  In order to solve this problem, the space between the outer lip 13ka and the inner lip 13kb of the upper sub-ground packing 13k is filled with grease, and the space between the outer lip 11pa and the inner lip 11pb of the lower sub-ground packing 11p. The grease is filled and lubricated.

  However, in this method, there is a problem that the grease that is initially filled decreases during many years of use and the lubrication action deteriorates, and the internal device is often damaged due to excessive filling of grease. There was a problem. Furthermore, there is a problem that it is difficult to detect and monitor each of the above-described phenomena externally.

  The present invention solves the above-mentioned problems, and ensures lubrication for the upper and lower sub-ground packings 13k and 11p regardless of the action of the upper and lower main ground packings 13j and 11o, and is excessive due to pressure accumulation. By preventing the occurrence of sliding surface pressure, the upper and lower sub-ground packings 13k, 11p are prevented from being burned out or damaged. If the main or sub-ground packings 13j, 11o, 13k, 11p are damaged, It is an object of the present invention to provide a gland seal device for an actuator of a rotary vane type steering machine capable of detecting a phenomenon from the outside.

  In order to solve the above problems, a ground seal device for an actuator of a rotary vane type steering machine according to the present invention includes a rotor fitted to and mounted on a rudder shaft, and a space for an oil chamber formed around the rotor by housing the rotor. A housing and an annular top cover disposed in the upper opening of the housing, wherein the rotor has a plurality of vanes at equal intervals along the circumferential direction of the outer peripheral surface, and the housing extends along the circumferential direction of the inner peripheral surface The oil chamber space is divided into a plurality of hydraulic oil chambers by vanes and segments, and the hydraulic oil chambers at the counter electrode with respect to the rotational axis of the rotor communicate with each other. In the rotary vane type steering machine actuator, the top cover has a through hole into which the upper shaft portion of the rotor is loosely fitted, and an upper ground seal is formed on the inner peripheral surface of the through hole. The upper ground seal device is composed of an upper main ground packing and an upper sub ground packing made of an elastic material that is in sliding contact with the outer peripheral surface of the upper shaft portion of the rotor, and the housing is arranged at the bottom boss portion at the lower portion of the rotor. The shaft portion has a through hole in which the shaft portion is loosely fitted, and a lower ground seal device is provided on the inner peripheral surface of the through hole. It is composed of a ground packing and a lower secondary ground packing, and is a space between the upper main ground packing and the upper secondary ground packing of the upper ground seal device, and between the lower main ground packing and the lower secondary ground packing of the lower ground seal device. Connect a gland sealing oil line to each of the spaces. Characterized in that a galvanometer to.

  In the gland seal device for the actuator of the rotary vane type steering machine of the present invention, the hydraulic oil is guided to the gland sealing oil line from the hydraulic oil return line in the hydraulic circuit for operating the rotary vane type steering machine. And

  In the ground seal device of the actuator of the rotary vane type steering machine of the present invention, the top cover has a ring-shaped upper ring slit on the back surface thereof at a portion facing the outer peripheral edge of the upper end surface of the rotor. An upper ring seal made of an elastic material is held in the housing, and the housing has a ring-shaped lower ring slit at a portion facing the outer peripheral edge of the lower end surface of the rotor on the inner bottom surface, and the elastic material is placed in the lower ring slit. Each of the vanes of the rotor has a slit extending in the radial direction of the rotor on the upper end surface facing the back surface of the top cover, and holds an upper horizontal seal made of an elastic material in the slit. And having a slit extending in the radial direction of the rotor on the lower end surface facing the inner bottom surface of the housing. In addition, a lower horizontal seal made of an elastic material is held in the slit, and a slit extending in the axial direction of the rotor is formed on the radial front end surface facing the inner peripheral surface of the housing, and the slit is made of an elastic material. Holds the vertical seal, and the upper and lower end surfaces of the vertical seal are in contact with the back surfaces of the upper and lower horizontal seals, respectively, and each segment of the housing has a slit in the radial front end surface facing the outer peripheral surface of the rotor. The segment vertical seal made of an elastic material is held in the slit, the upper end surface of the segment vertical seal is in contact with the back surface of the top cover, and the lower end surface of the segment vertical seal is in contact with the inner bottom surface of the housing. Lead the hydraulic oil from the hydraulic oil chamber on the high pressure side to the back, and press each seal surface against the mating surface with this hydraulic pressure. The features.

  As described above, according to the present invention, the space between the upper main ground packing and the upper sub-ground packing on the peripheral surface of the upper shaft portion of the rotor, and the lower main surface on the peripheral surface of the lower shaft portion of the rotor. Upper and lower ground sealing oil lines are provided in the space between the ground packing and the lower secondary ground packing, respectively, so that the hydraulic oil is guided from the hydraulic oil return line of the hydraulic circuit that operates the steering gear, and the upper By providing a galvanometer in each of the lower and upper ground sealing oil lines, the upper and lower secondary ground packings can be lubricated by the hydraulic oil regardless of the action of the upper and lower main ground packings.

As a result, the following conventional problems are eliminated.
・ Long-term degradation of lubrication in the case of conventional grease-filled lubrication methods ・ Possibility of damage to internal equipment due to overfilling of grease ・ High-pressure working oil from upper (or lower) main ground packing Leaking into the space between the upper (or lower) main ground packing and the upper (or lower) sub-ground packing, creating a pressure build-up phenomenon in this space, so that the upper (or lower) sub-ground packing is excessive. The problem of damage to the packing due to sliding contact surface pressure Furthermore, in the past, malfunction of the upper (or lower) main ground packing could not be detected and monitored externally. For example, the upper (or lower) gland seal indicates that an oil flow has occurred in the upper (or lower) gland sealing oil line. By detecting with a ring oil galvanometer, malfunction of the upper (or lower) main ground packing can be detected and monitored externally.

The supply system of the hydraulic fluid to the gland seal device of the rotary vane type steering machine actuator in the embodiment of the present invention is shown, (a) is a longitudinal sectional view, (b) is a plan view. FIG. 1 is an enlarged detailed view of “A” portion in FIG. FIG. 1 is an enlarged detailed view of “B” portion in FIG. The hydraulic system diagram for operating the rotary vane type steering machine with the function of supplying hydraulic oil to the gland seal device Partial cross-sectional perspective view showing actuator of rotary vane type steering machine in background art The same shows the actuator of the rotary vane type steering machine, and is a cross section taken along the line aa in FIG. Cross-sectional view showing actuator of rotary vane type steering machine FIG. 6 is an enlarged detailed view of “C” portion in FIG. FIG. 6 is an enlarged detailed view of “D” portion in FIG. Same as above, enlarged detail view of “E” portion in FIG. Same as above, enlarged sectional view showing the configuration of the upper and lower horizontal seals and vertical seals of the rotor vane of the rotary vane type steering gear actuator and the vertical seal of the housing segment Same as above, enlarged sectional view showing the upper and lower ring seals of the rotary vane steering actuator The same shows the upper ground seal device of the rotary vane type steering machine actuator, and is an enlarged detail view of the “F” part in FIG. The same shows the lower ground seal device of the rotary vane type steering machine actuator, and is an enlarged detail view of the “G” portion in FIG. Hydraulic system diagram for rotary vane steering gear operation

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The members that perform basically the same operations as those of the background art described above with reference to FIGS.

  As shown in FIGS. 1 and 2, in the upper gland seal device 13i, a communication hole 51 is formed in the annular portion 13na of the upper gland packing presser 13n. The communication hole 51 is formed between the outer peripheral surface of the annular portion 13na and the inner peripheral surface of the annular portion 13na, and the upper main ground packing 13j and the upper portion on the outer peripheral surface of the upper shaft portion 12b of the rotor 12. It is electrically connected to the space 13p between the sub-ground packing 13k.

  An upper ground sealing oil hole 52 is drilled through the inside of the top cover 13 and inside the peripheral wall of the housing 11. One end of the upper ground sealing oil hole 52 communicates with the opening on the outer peripheral side of the communication hole 51, and the other end opens as an outlet 52 a at the substantially central portion in the vertical direction on the outer peripheral surface of the housing 11.

  As shown in FIGS. 1 and 2, an upper ground sealing oil line 53 is provided outside the actuator 10, and one end thereof is connected to an outlet 52a of the upper ground sealing oil hole 52, and the other end is a return. Connect to line 30. The return line 30 is a line that returns hydraulic oil to the oil tank 26 in the hydraulic device 2 that operates the actuator 10.

  As an arrangement for filling the space 13p with hydraulic oil from the return line 30 in the initial state, an upper ground air vent hole 61 that communicates the space 13p with the outside air is provided through the upper ground packing presser 13n. An upper ground vent valve 61a is provided at the outlet of the upper ground air vent hole 61 to the outside air.

The upper gland sealing oil line 53 is provided with an upper gland sealing oil galvanometer 55 via an upper gland stop valve 54 provided on the peripheral wall side of the housing 11.
As shown in FIGS. 1 and 3, in the lower ground seal device 11n, a communication hole 56 is formed in the annular portion 11ra of the lower ground packing presser 11r. The communication hole 56 is formed between the outer peripheral surface of the annular portion 11ra and the inner peripheral surface of the annular portion 11ra, and the lower main ground packing 11o and the lower portion on the outer peripheral surface of the lower shaft portion 12a of the rotor 12 are formed. It is electrically connected to the space 11t between the sub-ground packing 11p.

  A lower ground sealing oil hole 57 is perforated through the inside and bottom of the peripheral wall of the housing 11. One end of the lower ground sealing oil hole 57 communicates with the opening on the outer peripheral side of the communication hole 56. The end opens as an outlet 57 a on the outer peripheral surface of the housing 11, and the outlet 57 a of the lower ground sealing oil hole 57 and the outlet 52 a of the upper ground sealing oil hole 52 open side by side.

  As shown in FIGS. 1 and 4, a lower ground sealing oil line 58 is provided outside the actuator 10, and one end of the lower ground sealing oil line 58 is connected to an outlet 57 a of the lower ground sealing oil hole 57. The other end is connected to the return line 30.

  As a configuration for filling the space 11t with hydraulic oil from the return line 30 in the initial state, a lower ground air vent hole 62 that communicates the space 11t with the outside air is provided through the lower ground packing retainer 11r. A lower ground vent valve 62a is provided at the outlet of the lower ground air vent hole 62 to the outside air.

The lower ground sealing oil line 58 is provided with a lower ground sealing oil galvanometer 60 via a lower ground stop valve 59 provided on the peripheral wall side of the housing 11.
Hereinafter, the operation of the above-described configuration will be described. In the present embodiment, the upper ground seal device 13i and the lower ground seal device 11n perform the same operation, and therefore only the upper ground seal device 13i will be described below.

  1 and 2, first, in a normal operation state of the actuator 10, the hydraulic fluid of the actuator 10 having the hydraulic pressure p1 acts between the outer lip 13jb and the inner lip 13jc of the upper main ground packing 13j. The operating hydraulic pressure p2 of the return line 30 in the hydraulic circuit 2 that operates the actuator 10 acts between the outer lip 13ka and the inner lip 13kb of the upper auxiliary ground packing 13k.

The hydraulic pressure p2 in the return line 30 is determined by the resistance of the return filter 31. The hydraulic pressure p2 varies depending on the degree of clogging of the mesh of the return filter 31, but is a value of about 1 kg / cm ^{2 at} the minimum.

  In this state, the inner lip 13jc of the upper main ground packing 13j is pressed against the upper shaft portion 12b of the rotor 12 by the hydraulic pressure (P1-p2), so that the upper shaft portion 12b of the rotor 12 and the top cover 13 are pressed. The sealing action between the through hole 13h is performed. At this time, since the inner lip 13jc is in contact with the hydraulic oil, the sliding portion is also lubricated.

  In the upper sub-ground packing 13k, the inner lip 13kb is pressed against the upper shaft portion 12b of the rotor 12 by the hydraulic oil having the hydraulic pressure p2 guided between the outer lip 13ka and the inner lip 13kb. This prevents the hydraulic oil from leaking out of the machine through the space between the upper shaft portion 12b of the rotor 12 and the through hole 13h of the top cover 13.

Meanwhile, the tip of the inner lip 13 kb, which is a sliding portion, is in contact with the hydraulic oil, so that the sliding portion is also lubricated.
In the above normal operating state, in the upper gland seal device 13i, there is no flow of hydraulic oil in the upper gland sealing oil line 53 connected to the return line 30 of the hydraulic device 2, so this is the upper gland sealing oil. It can be detected by the galvanometer 55.

  Next, if the sealing function of the upper main ground packing 13j is inadequate, the high-pressure hydraulic oil sealed in the upper main ground packing 13j is removed from the outer lip 13ka and the inner lip of the upper auxiliary ground packing 13k. It penetrates into the space between 13 kb continuously or intermittently. However, the inner lip 13 kb of the upper sub-ground packing 13 k is pressed against the upper shaft portion 12 b of the rotor 12, so that the hydraulic oil that has entered the upper sub-ground packing 13 k is brought into contact with the upper shaft portion 12 b of the rotor 12 and the top. It is possible to prevent leakage through the space between the cover 13 and the through hole 13h.

  Thus, the hydraulic oil leaked from the upper main gland packing 13j toward the upper sub-gland packing 13k passes through the upper gland sealing oil hole 52 through the upper gland sealing oil line 53, and passes through the upper gland stop valve 54 and the upper gland sealing. It escapes to the return line 30 of the hydraulic device 2 through the oil galvanometer 55.

  Accordingly, the hydraulic oil leaked from the upper main ground packing 13j is not accumulated in the space between the upper main ground packing 13j and the upper auxiliary ground packing 13k, and the inner lip 13kb of the upper auxiliary ground packing 13k and the rotor are accumulated by the accumulated pressure. Therefore, it is possible to prevent the sliding contact surface pressure between the upper shaft portion 12b and the upper shaft portion 12b from becoming excessive, and to prevent the upper sub-ground packing 13k from being burned out or damaged due to the excessive sliding contact surface pressure.

  At that time, the sliding portions of the inner lips 13jc and 13kb of the upper main ground packing 13j and the upper sub-ground packing 13k remain in contact with the hydraulic oil, so that lubrication is ensured.

  When hydraulic fluid leaks from the upper main gland packing 13j, it is connected to the return line 30 of the hydraulic system 2 through the upper gland sealing oil hole 52, the upper gland stop valve 54, and the upper gland sealing oil galvanometer 55. Since the flow of hydraulic oil is generated in the upper ground sealing oil line 53, the phenomenon can be confirmed by viewing the upper ground sealing oil galvanometer 55.

  And when the damage of the upper main gland packing 13j mentioned above appears as the flow of the hydraulic oil in the upper gland sealing oil galvanometer 55, and the event is detected, by closing the upper gland stop valve 54, The sealing action that the upper main ground packing 13j has been in charge of then shifts to the upper auxiliary ground packing 13k, and the upper secondary ground packing 13k continues the sealing action. Therefore, the operation of the steering machine can be maintained.

  Even when the upper gland stop valve 54 is closed due to the loss of the function of the upper main gland packing 13j described above, the hydraulic oil contacts the inner lip 13kb which is a sliding portion in the upper sub gland packing 13k. Therefore, lubrication with respect to the inner lip 13 kb is ensured.

10 Rotary vane type steering gear actuator 11 Housing 11n Lower ground seal device 11o Lower main ground packing 11oa Outer lip 11ob Inner lip 11p Lower secondary ground packing 11pa Outer lip 11pb Inner lip 11q Lower main ground packing groove 11r Lower ground packing presser 11ra Circle Ring portion 11s Lower secondary ground packing groove 11t Space formed between the outer peripheral surface of the lower rotor shaft portion 12a and the lower main ground packing 11o and the lower auxiliary ground packing 11p 12 Rotor 12a Lower shaft portion 12b Upper shaft portion 13i Upper ground Sealing device 13j Upper main gland packing 13ja Upper main gland packing base 13jb Upper main gland packing outer lip 13jc Upper main gland Packing inner lip 13k Upper sub-ground packing 13ka Upper sub-ground packing outer lip 13kb Upper sub-ground packing inner lip 13m Upper main ground packing groove 13n Upper ground packing presser 13na Annular portion 13o Upper sub-ground packing groove 13p Rotor upper shaft Space 15 formed between the outer peripheral surface of the portion 12b, the upper main ground packing 13j, and the upper sub-ground packing 13k. Oil chamber spaces 15a, 15b, 15c, 15d Hydraulic oil chamber 16 Pressure valve 16a Hydraulic line (pressure valve 16 For)
17 Rudder shaft 20 Hydraulic device 30 Return line 51 Communication hole 52 Upper ground sealing oil hole 52a Outlet 53 Upper ground sealing oil line 54 Upper ground stop valve 55 Upper ground sealing oil galvanometer 56 Communication hole 57 Lower ground sealing oil hole 57a Outlet 58 Lower gland sealing oil line 59 Lower gland stop valve 60 Lower gland sealing oil galvanometer 61 Upper gland air vent hole 61a Upper gland vent valve 62 Lower gland air vent hole 62a Lower gland vent valve

Claims (3)

A rotor fitted and mounted on the rudder shaft, a housing that houses the rotor and forms an oil chamber space around the rotor, and an annular top cover that is disposed in the upper opening of the housing;
The rotor has a plurality of vanes at equally spaced positions along the circumferential direction of the outer peripheral surface, and the housing has a plurality of segments at evenly spaced positions along the circumferential direction of the inner circumferential surface. In an actuator for a rotary vane type steering machine in which an oil chamber space is divided into a plurality of hydraulic oil chambers, and hydraulic oil chambers that are opposite to the rotation axis of the rotor communicate with each other.
The top cover has a through hole in which the upper shaft portion of the rotor is loosely fitted, and has an upper ground seal device on the inner peripheral surface of the through hole, and the upper ground seal device slides on the outer peripheral surface of the upper shaft portion of the rotor. Consists of an upper main ground packing and an upper sub-ground packing made of elastic material in contact with each other
The housing has a through hole in which the lower shaft portion of the rotor is loosely fitted in the boss portion at the bottom, and has a lower ground seal device on the inner peripheral surface of the through hole. It consists of a lower main ground packing and a lower sub-ground packing made of an elastic material that is in sliding contact with the outer peripheral surface.
A ground sealing oil line is connected to the space between the upper main ground packing and the upper sub ground packing of the upper ground seal device, and the space between the lower main ground packing and the lower sub ground packing of the lower ground seal device, respectively; A gland seal device for an actuator of a rotary vane type steering machine, wherein a galvanometer is provided in the gland sealing oil line.   2. The rotary vane type steering machine actuator according to claim 1, wherein the hydraulic oil is led to a ground sealing oil line from a hydraulic oil return line in a hydraulic circuit for operating the rotary vane type steering machine. Gland seal device. The top cover has a ring-shaped upper ring slit at a portion facing the outer peripheral edge of the upper end surface of the rotor on the back surface, and an upper ring seal made of an elastic material is held in the upper ring slit. On the inner bottom surface, there is a ring-shaped lower ring slit in a portion facing the outer peripheral edge of the lower end surface of the rotor, and a lower ring seal made of an elastic material is held in the lower ring slit,
Each vane of the rotor has a slit extending in the radial direction of the rotor on the upper end surface facing the back surface of the top cover, and an upper horizontal seal made of an elastic material is held in the slit and is opposed to the inner bottom surface of the housing. A slit extending in the radial direction of the rotor is held on the end surface, and a lower horizontal seal made of an elastic material is held in the slit, and a slit extending in the axial direction of the rotor is formed on the radial front end surface facing the inner peripheral surface of the housing. And holding a vertical seal made of an elastic material in the slit, the upper end surface and the lower end surface of the vertical seal abut the back of the upper horizontal seal and the lower horizontal seal,
Each segment of the housing has a slit in the radial front end surface facing the outer peripheral surface of the rotor, and a segment vertical seal made of an elastic material is held in the slit, and the upper end surface of the segment vertical seal is on the back surface of the top cover. Abutting, the lower end surface of the segment vertical seal abuts the inner bottom surface of the housing,
The rotary vane type according to claim 1 or 2, wherein pressure oil is guided from a hydraulic oil chamber on the high pressure side to each back surface of each seal, and each seal surface is pressed against the mating surface by this hydraulic pressure. Ground seal device for steering machine actuator.

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