JP2016121720A - Spherical bearing, rotation drive device and variable nozzle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spherical bearing having a wide movable range and capable of being applied to various use environments, a rotation drive device, and a variable nozzle device.SOLUTION: A spherical surface upper bearing includes: a shaft body having a portion of which the outer peripheral surface is formed of a spherical surface; a plurality of split bearing bodies individually and independently receiving the spherical surface of the shaft body; energization means energizing the plurality of split bearing bodies arranged along the spherical surface of the shaft body to the shaft body side; and a holding member holding the plurality of split bearing bodies energized to the shaft body side by the energization means. Preferably, the spherical surface upper bearing can be used in a variable nozzle device.SELECTED DRAWING: Figure 1

Description

  The present invention relates to, for example, a spherical bearing used as a bearing for an office machine, an industrial machine, etc., a rotary drive device including the spherical bearing, and a variable nozzle device.

  Conventionally, bearings have been designed with a fitting gap that fits the environment in which they are used, but in order to adjust the fit of the bearing components, for example, a sleeve is provided in the gap between the inner ring and outer ring of the bearing. A bearing having a different structure is known (see Patent Document 1).

JP-A-9-126234

  In the conventional spherical plain bearing as described in Patent Document 1, even if the fit of each component can be adjusted with high accuracy during assembly, the subsequent use environment is, for example, in an environment with severe temperature changes. It was sometimes difficult to use.

  The present invention provides a spherical bearing, a rotary drive device, and a variable nozzle device that have a wide movable range and can be applied to various usage environments.

A spherical bearing according to the present invention includes a shaft body having a portion having an outer peripheral surface formed of a spherical surface, a plurality of split bearing bodies that individually receive the spherical surface of the shaft body, and a spherical surface of the shaft body. An urging means for urging the plurality of divided bearing bodies arranged to the shaft body side, and a holding member for holding the plurality of divided bearing bodies urged to the shaft body side by the urging means. It is characterized by having.
According to such an aspect of the present invention, each of the plurality of split bearing bodies is biased toward the shaft body by the biasing means, so that a wide movable range can be realized and it can be applied to various usage environments. It becomes.

The spherical bearing of the present invention is configured to receive the spherical surface of the shaft body by three or more of the divided bearing bodies, and the three or more of the divided bearing bodies have an outer periphery with respect to the spherical surface of the shaft body. It is characterized by being evenly arranged in the direction.
According to this aspect of the present invention, since the shaft body is received by three or more equally divided bearing bodies, a wider movable range can be realized.

Furthermore, in the above-mentioned present invention, the holding means has an insertion opening that defines a space in which the shaft is inserted and arranged, and the opening periphery of the insertion opening is between the shaft and the shaft. A plurality of insertion portions into which the split bearing body can be inserted are provided in the outer peripheral direction, and the split bearing body inserted from the insertion portion is inserted between the plurality of insertion portions in the outer peripheral direction of the spherical surface of the shaft body. A holding portion for holding the divided bearing body by sliding is provided.
According to this aspect of the present invention, it is possible to efficiently arrange a plurality of split bearing bodies along the outer peripheral surface of the shaft body.

Or in the said invention, the said holding means is toward the said insertion opening part from the insertion opening part which defines the space where the said shaft body is inserted and arrange | positioned, and the outer peripheral part on the opposite side to the said insertion opening part side. It has a plurality of through holes which are provided through and into which each of the divided bearing bodies is inserted.
According to this aspect of the present invention, it is possible to efficiently place a plurality of divided bearing bodies in contact with the outer peripheral surface of the shaft body through the plurality of through holes provided in the holding means.

In the present invention, the holding member has an annular holding surface that surrounds the shaft body and holds the plurality of split bearing bodies with the urging means interposed therebetween.
According to this aspect of the present invention, it becomes possible to stably hold a plurality of split bearing bodies.

Moreover, in the said invention, the said urging | biasing means has the some elastic deformation part provided independently corresponding to every said some division | segmentation bearing body, It is characterized by the above-mentioned.
According to this aspect of the present invention, by providing the elastically deforming portion in each of the divided bearing bodies, the operation of each of the independent divided bearing bodies can be realized.

Further, in the present invention, the urging means has an elastic deformation portion provided integrally with each of the plurality of divided bearing bodies.
According to this aspect of the present invention, the biasing structure of each divided bearing body is simplified by providing a common elastic deformation portion for each divided bearing body.

In the present invention, each of the plurality of split bearing bodies is provided in the same shape, and the biasing means biases each of the plurality of split bearing bodies toward the shaft body with an equal biasing force. It is characterized by doing so.
According to this aspect of the present invention, since the shaft body can be held with an equal urging force, a stable bearing structure can be realized.

Note that the present invention can be widely applied to a rotary drive device including the spherical bearing described above.
According to this aspect of the present invention, it is possible to realize a rotary drive device having a bearing structure that has a wide movable range and can be applied to various usage environments.

  Further, the present invention is not limited to the above-described configuration. For example, a nozzle member having a spherical portion in which a part of the outer peripheral surface is a spherical surface, and a pressure space communicating with the nozzle hole of the nozzle member are defined. A spherical bearing that receives the spherical portion of the nozzle member so as to protrude into the pressure space and is joined to a nozzle mounting portion to which the nozzle member is mounted among the pressure vessels. A base end portion of the member extending from the spherical portion into the pressure space is in sliding contact with an outer peripheral portion of the spherical bearing via a seal member, and the base end portion of the nozzle member and the seal The term “member” is also widely used for variable nozzle devices that are slidably contacted with the center of rotation of the nozzle member.

  According to this aspect of the present invention, the pressure fluctuation in the pressure vessel can be effectively suppressed even if the nozzle member is moved by interposing the seal member at the sliding contact portion between the nozzle member and the spherical bearing. .

In such a variable nozzle device of the present invention, the spherical bearing is disposed along a plurality of divided bearing bodies that individually receive the spherical surfaces of the spherical portions and the spherical surface of the shaft body. Biasing means for biasing the plurality of split bearing bodies toward the shaft body side, and a holding member for holding the plurality of split bearing bodies biased toward the shaft body side by the biasing means, The holding member is coupled to the pressure vessel.
According to such an aspect of the present invention, the movable range of the nozzle member can be set wide while effectively suppressing the pressure fluctuation in the pressure vessel, and can be applied to various usage environments.

  The present invention can realize a spherical bearing, a rotary drive device, and a variable nozzle device that have a wide movable range and can be applied to various usage environments.

The perspective view and front view which show schematic structure of the spherical bearing which concerns on 1st Embodiment. FIG. 3 is an exploded view showing a schematic configuration of the spherical bearing according to the first embodiment. The principal part enlarged view of the spherical bearing which concerns on 1st Embodiment. The top view and sectional drawing of the spherical bearing which concern on 1st Embodiment. The perspective view in case the spherical bearing body which concerns on 1st Embodiment is provided with the axis | shaft. The assembly procedure figure of the spherical bearing which concerns on 1st Embodiment. The perspective view and three-dimensional exploded view which show schematic structure of the spherical bearing which concerns on 2nd Embodiment. The assembly procedure figure of the spherical bearing which concerns on 2nd Embodiment. The perspective view which shows schematic structure of the spherical bearing which concerns on 3rd Embodiment, and a three-dimensional exploded view. The assembly procedure figure of the spherical bearing which concerns on 3rd Embodiment. The perspective view and three-dimensional exploded view which show the schematic block diagram of the spherical bearing which concerns on 4th Embodiment. The perspective view which shows the schematic block diagram of the spherical bearing which concerns on 5th Embodiment. The schematic sectional drawing of the variable nozzle apparatus which concerns on other embodiment of this invention.

  Hereinafter, the present invention will be specifically described.

  The spherical bearing of the present invention includes a shaft body, a plurality of divided bearing bodies that individually receive the shaft bodies, biasing means for biasing the plurality of divided bearing bodies toward the shaft body, and biasing the shaft body The present invention relates to a pressurizing spherical bearing having a wide movable range and a holding member for holding a plurality of divided bearing bodies, which can be applied to various usage environments.

  That is, the present invention has a configuration of a pressure spherical bearing of an independent rack in which a plurality of divided bearing bodies are biased (pressurized) to the shaft body side while surrounding the shaft body by a plurality of divided bearing bodies held by the holding means, In addition to the spherical sliding motion of the shaft body between the plurality of split bearing bodies, the shaft body is substantially allowed to swing, and the high trackability of each split bearing body with respect to the shaft body is realized.

  As described above, the above-described characteristic configuration of the present invention substantially increases the movable range of the shaft body that can perform the spherical sliding operation, and further, the shaft body is highly followable depending on the biased (pressurized) state of the shaft body. This is a pressurized spherical bearing with the characteristics, and it can be applied to thermal expansion in various usage environments, for example, environments with severe temperature changes, and it is also applied to physical shock absorption applied to the shaft body or holding means It is extremely effective for physical shock absorption.

  In addition, the present invention is preferably a shaft body (inner ring) and a plurality of split bearing bodies (outer ring) formed of different metal materials, that is, a metal spherical bearing body. High shape stability and high durability as a bearing can be realized.

  Furthermore, in the present invention, it is preferable that the plurality of split bearing bodies constituting the outer ring have the same shape and are divided into three or four at equal intervals on the outer periphery of the shaft body constituting the inner ring. If the bearing body is divided finely, the swing range of the shaft body can be set wide and stable driving can be realized.

  In addition, by placing an urging means between each divided bearing body surrounding the shaft body and the holding means for holding each divided bearing body, each divided bearing body is pressurized to the shaft body side, that is, It becomes the configuration which stands independently. Thus, although specifically described in detail, the movable range of the bearing portion can be set wide while the shaft body is received by each divided bearing body.

  Such urging means may be mounted on the holding means in advance, or may be provided corresponding to each of the divided bearing bodies. For example, when the urging means is attached to the holding means, the urging means may be a common urging means for each of the divided bearing bodies, or a separate urging means is provided. Also good. In any case, if the urging force from the urging means to each divided bearing body is set to be equal, a stable independent frame pressure spherical bearing that is equally pressurized against the shaft body is constructed. Is possible.

  Furthermore, the holding means for holding each of the divided bearing bodies described above may be constituted by, for example, an annular frame (housing) that is integrally provided so as to surround each divided bearing body that pressurizes and holds the shaft body. . As a result, each split bearing body can be held stably and reliably, which is effective in improving reliability. In the present invention, even if a physical impact is applied to such a holding means, each split bearing body is in a state of being biased toward the shaft body side, so that a configuration for absorbing the shock to the shaft body is realized. In addition, it can be applied to dimensional changes due to thermal expansion.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<First Embodiment>
FIG. 1 shows an overall schematic configuration diagram of a spherical bearing according to a first embodiment of the present invention, FIG. 1 (a) is a perspective view, and FIG. 1 (b) is a front view. FIG. 2 is an exploded perspective view of the spherical bearing of FIG. FIG. 3 shows an enlarged view of the main part of FIG. FIG. 4 shows a plan view and a cross-sectional view of the spherical bearing of FIG.

  As shown in FIGS. 1 to 4, the spherical bearing 100 of the present embodiment includes a shaft body 110 having an outer peripheral surface formed of a spherical surface 110 a, a bearing unit 120 that receives the shaft body 110, and the bearing unit 120. The holding member 130 to hold | maintain is connected, for example to the base board 140 used as an attachment target object.

  Here, the shaft body 110 is made of a metal cylindrical member provided with a through hole 111 penetrating in the axial direction, and an outer peripheral surface thereof is formed by a spherical surface 110a. Although the details will be described later in the through hole 111 provided in the shaft body 110, the shaft member 110 is provided with the shaft body 110 that performs spherical sliding operation by fitting a rod-shaped member. In addition, although it does not specifically limit as a material which forms this shaft body 110, For example, in this embodiment, it formed with aluminum.

  The bearing unit 120 that receives the shaft body 110 includes four divided bearing bodies 121 that are arranged so as to surround the shaft body 110 along the outer circumferential direction of the shaft body 110. Further, each of the divided bearing bodies 121 is formed of, for example, a metal arcuate member in this embodiment, and the surface on the side receiving the outer peripheral surface (spherical surface 110a) of the shaft body 110 is the spherical surface 110a of the shaft body 110. Is provided with a spherical bearing surface 121a. Furthermore, the elastic deformation part 122 is integrally joined to the outer peripheral surface on the opposite side to the bearing surface 121a among these divided bearing bodies 121. That is, the bearing unit 120 of the present embodiment is configured by four divided bearing bodies 121 each provided with an elastic deformation portion 122. In addition, it is good to use what differs from the metal material which forms the said shaft body 110, and the metal material which forms the division | segmentation bearing body 121, for example, in this embodiment, each division | segmentation bearing body 121 was formed with the brass. In the present embodiment, the shape of the split bearing body 121 provided with the elastic deformation portions 122 is the same, and the urging force of each elastic deformation portion 122 is also equal.

  Furthermore, the holding member 130 that holds the bearing unit 120 is provided with a holding hole 131 through which the bearing unit 120 is inserted and held in the axial direction. For example, the holding member 130 according to the present embodiment includes a cylindrical portion 132 provided with a holding hole 131 and a flange-like flange portion 133 that protrudes radially outward from an outer peripheral portion on one end side of the cylindrical portion 132. And have. The flange portion 133 is connected to the base substrate 140 with screws A as shown in FIGS.

  Further, in the holding hole 131 of the holding member 130, four holding portions 134 that hold the respective bearing units 120 are provided at equal intervals along the inner peripheral surface. Are provided with four notches 135 into which the respective bearing units 120 can be inserted. Further, each holding portion 134 has a pair of flange portions 136 that protrude from the opening of the holding hole 134 and limit the movement of each bearing unit 120 in the axial direction.

  The opening on one side of the holding hole 131 of the holding member 130 forms an insertion opening 137 into which the shaft body 110 is inserted coaxially. In a state where the shaft body 110 is disposed in the insertion opening 137, the insertion portions 138 into which the divided bearing bodies 121 can be inserted are formed at the four notches 135 at the opening periphery of the insertion opening 137. And the shaft body 110, respectively. Each insertion portion 138 is a portion into which the split bearing body 121 is inserted during assembly, but after assembly, it becomes a ventilation portion for releasing heat. Thereby, the adaptability with respect to various use environments can be improved.

  Further, in the opening on the other side of the holding hole of the holding member 130, four attachment pieces 139 for closing the opening of the notch 135 in a state where the shaft body 110 is arranged are shown in FIGS. As shown in b), they are connected by screws B. Protrusions 139a for restricting the movement of the respective divided bearing bodies 121 are provided at the ends of the mounting pieces 139. That is, when each notch 138 is closed with each mounting piece 139, the protrusion 139 a comes into contact with the corner of each divided bearing body 121 held by the holding part 134, and thereby each division located at the holding part 134. The movement of the bearing body 121 is substantially limited. Here, the width (pitch width) between the divided bearing bodies 121 is set to be smaller than the axial width of the shaft body 110, which facilitates the insertion and arrangement of the divided bearing bodies 121 described above. Become.

  The spherical bearing 100 is connected to a base substrate 140 that is an attachment target. The base substrate 140 is provided with an opening hole 141 penetrating in the axial direction, a groove 142 into which the flange portion 133 of the holding member 130 is fitted, and a screw holding hole 143 through which the screw B for connecting the four notch pieces 139 of the holding member 130 passes. It has been. As shown in FIG. 2, the base substrate 140 is connected to the flange portion 133 of the holding member 130 with four screws A.

  Here, with reference to FIG. 5, operation | movement of a spherical bearing body is demonstrated. FIG. 5 is a schematic view in which the shaft body of the spherical bearing of FIG. 1 includes a shaft.

As shown in FIG. 5, in the spherical bearing 100 of the present embodiment, a rod-shaped member 150 is engaged with the shaft body 110, and the shaft body 110 that performs a spherical sliding motion in the spherical bearing 110 serves as the shaft member. The spherical bearing 100 according to the present embodiment can rotate with respect to the central axis of the shaft body 110 while being fixed to the base substrate 140. Further, the spherical sliding motion as shown in FIGS. 5A and 5B can be performed smoothly. Further, since the bearing unit 120 that receives the shaft body 110 urges each of the divided bearing bodies 121 by the urging means with respect to the shaft body 110, the shaft body 110 (that is, the shaft of each divided bearing body 121). Body). Thereby, even if an impact different from the operation required for the spherical slip is applied to the shaft body 110, each split bearing body 121 follows the shaft body 110, so that the bearing state of the shaft body 110 is maintained. Therefore, in addition to the movable range as the shaft of the shaft body 110, the swing range of the shaft body 110 according to the biased state can be added.

  In addition, with reference to FIG. 6, the assembly procedure of the spherical bearing 100 in this embodiment is demonstrated in detail. FIG. 6 is a perspective view showing an assembling procedure of the spherical bearing according to the present embodiment.

  First, as shown in FIG. 6A, the shaft body 110 is inserted coaxially with respect to the insertion opening 137 of the holding member 130. Next, as shown in FIG. 6B, one of the split bearing body 121 and the elastic deformation portion 122 constituting the bearing unit 120 is inserted into the insertion portion 138 of the holding member 130. At this time, the bearing surface 121 a of the split bearing body 121 is inserted by sliding along the outer peripheral surface of the shaft body 110 in the holding member 130. Subsequently, as shown in FIG. 6C, the shaft body 110 is slid to the holding portion 134 that holds one bearing unit 120 while keeping the outer peripheral surface of the shaft body 110 and the inner peripheral surface of the split bearing body 121 along. A sectional view showing the state of the bearing unit 120 at this time is shown in FIG. Next, the remaining three divided bearing bodies 121 and the elastically deformable portions 122 are similarly slid and inserted into the holding portions 134. 3 (b) and 4 (b), the mounting piece 139 is fixed with screws B correspondingly between the bearing units 120, and the spherical bearing 100 is assembled. Fix with A. Thereby, the assembly of all the parts is completed, and at this time, the central axis of the spherical bearing 100 is determined.

As described above, in the spherical bearing 100 of the present embodiment, the four divided bearing bodies 121 arranged annularly at equal intervals while the shaft body 110 is taken in by the four divided bearing bodies 121 held by the holding means 130. Since the shaft body 110 is biased (pressurized), it is possible to realize a structure of a stable independently suspended pressure spherical bearing.

  More specifically, in this embodiment, since the shaft body 110 receives an equal urging force by each of the divided bearing bodies 121 that are equally arranged independently and independently, the shaft body 110 is a spherical surface in each of the divided bearing bodies 121. For example, even if an impact is applied to the shaft body 110 from the outside while the sliding motion is possible, the impact can be absorbed within the urging range, so that the impact is propagated to the holding means 130 or the base substrate 140. It can be effectively reduced. Note that the impact on the holding means 130 and the base substrate 140 can also be prevented from directly propagating to the shaft body 110 within the above-described urging range. That is, since the spherical bearing 100 of the present embodiment has a swingable structure in addition to the spherical sliding motion, it can realize a wide movable range and can be applied to various usage environments, and also realizes a stable spherical sliding motion. it can.

  Further, in the present embodiment, the four split bearing bodies 121 have a structure in which the shaft body 110 is held in a spherically slidable and swingable manner from four directions at equal intervals along the outer periphery of the shaft body 110. A very simple and relatively low cost bearing structure can be realized.

  Furthermore, in this embodiment, since the elastic deformation portion 122 is integrally joined to the outer peripheral surfaces of the four divided bearing bodies 121, the shaft body 110 is substantially swung in addition to the spherical sliding motion of the shaft body 110. Can be realized, and high followability of each split bearing body 121 with respect to the shaft body 110 can be realized. For example, dimensional changes such as thermal expansion caused by the use environment, or external impacts are frequently applied. It can also handle the usage environment.

  In particular, in the present embodiment, the movable range of the shaft body 110 capable of the spherical sliding operation is increased, and further, the pressurized spherical surface having high followability with respect to the shaft body 110 depending on the biased (pressurized) state of the shaft body 110. Since it becomes a bearing, high durability can be realized with respect to physical shock absorption applied to the shaft body 110 or physical shock applied to the holding means 130.

In this embodiment, the shaft body 110 is configured as a single component. However, the shaft body 110 is integrated with the shaft, and can be easily assembled even in a harsh environment. Further, the shaft can be stably tracked. Is also realized.

Second Embodiment
7 is an overall schematic view of a spherical bearing according to a second embodiment of the present invention, FIG. 7 (a) is a perspective view, and FIG. 7 (b) is a three-dimensional exploded view. In addition, in this embodiment, about a part of bearing structure, since it is the same as that of 1st Embodiment mentioned above, the overlapping description and illustration are abbreviate | omitted.

Specifically, in the spherical bearing 200 of the present embodiment, four insertion through holes 132a through which the bearing unit 120 is inserted through the cylindrical portion 132 in the holding member 130 of the first embodiment, and each of these insertion through holes. The first embodiment is the same as the first embodiment except that a holding piece 132b for closing 132 is provided and a holding cover 231 that covers the outside of the cylindrical portion 132 is attached and fixed with screws C.

  The bearing unit 120 is inserted into each insertion through-hole 132a after the shaft body 110 is inserted and arranged in the holding hole 137 in the holding member 130, and thereafter each of the holding piece 132b, the holding cover 231 and the holding piece 139 is inserted. Therefore, the movement with respect to the shaft body 110 is substantially limited.

  In the present embodiment, the insertion opening of the insertion through hole 132a provided corresponding to the bearing unit is provided instead of the insertion portion 138 of the holding member 130 in the first embodiment described above, and more specifically. As shown in FIG. 7B, the insertion through-hole 132 is provided as a through-hole extending in the thickness direction through the outer periphery of the cylindrical portion 132 and perpendicular to the axis of the cylindrical portion 132. The insertion through holes 132a are all formed corresponding to the flanges 136, and the holding member 230 has a holding piece 132b having substantially the same shape as the insertion through hole 132a in order to close the insertion through hole 132a.

Further, the holding cover 231 for fixing the holding piece 132b of the holding member 230 is connected to the flange portion 133 of the holding member 230 with a screw C as shown in FIG. For example, the holding cover 231 of the present embodiment has a cylindrical cover portion 231a that covers the entire outer peripheral surface of the holding piece 132b in order to fix the movement of the holding piece 132b.

  Here, with reference to FIG. 8, the assembly procedure of the spherical bearing 200 in this embodiment is demonstrated. FIG. 8 shows an assembly procedure diagram of FIG. As shown in FIG. 8A, the shaft body 110 is inserted coaxially from the insertion opening 137 of the holding member 230. Next, as shown in FIG. 8B, the bearing unit 120 and the holding piece 132 b are inserted in this order into the insertion through-hole 132 a provided in the cylindrical portion 132 of the holding member 230. Finally, as shown in FIG. 8C, the holding cover 231 is inserted in the axial direction of the cylindrical portion 132 of the holding member 230.

  As described above, this embodiment also has the same effect as that described in the first embodiment, and the bearing unit 120 can be inserted and held from the outer periphery of the cylindrical portion 132 of the holding member 230. Thereby, it becomes possible to install the bearing unit 120 to be the shaft body 110 relatively easily.

<Third Embodiment>
FIG. 9 shows an overall schematic view of a spherical bearing according to a third embodiment of the present invention, FIG. 9 (a) is a perspective view, and FIG. 9 (b) is an exploded perspective view. In addition, about a part of bearing structure in this embodiment, since it is the same as that of 1st Embodiment and 2nd Embodiment mentioned above, the overlapping description and illustration are abbreviate | omitted.

  Specifically, in the bearing unit 120 of the first embodiment and the second embodiment described above, the elastic deformation portion 122 is integrally joined to the outer peripheral surface of each split bearing body 121, whereas in the present embodiment, As shown in FIG. 9B, the spherical bearing 300 includes a split bearing body 121 and an elastic deformation portion 122 as separate bodies.

  Furthermore, in the second embodiment described above, the holding piece 132b is inserted after the bearing unit 120 is attached to the holding member 230, whereas in the present embodiment, as shown in FIG. The holding piece 132b does not exist, and the elastic deformation portion 331 which is a separate body also plays the role of the holding piece.

  For example, when the elastic deformation portion 331 of the present embodiment is inserted into the insertion through-hole 132a that exists perpendicular to the axial direction of the holding member 330, the split bearing body 121 is all urged against the shaft body 110. The holding member 330 has an outer peripheral surface having a diameter equal to the outer periphery of the cylindrical portion 132.

  Here, an assembly procedure of the spherical bearing 300 of the present embodiment will be described with reference to FIG. FIG. 10 is an assembly procedure diagram of FIG. In FIG. 10A, as in the first embodiment, the shaft body 110 is inserted coaxially into the insertion opening 137 of the holding member 330, and the split bearing body 121 is inserted from the insertion through hole 132a of the holding member 330. , Slide to the holding part and insert. At this time, as shown in FIG. 10 (d), the inner peripheral surface of the split bearing body 121 may not necessarily touch the outer peripheral surface of the shaft body 110. Next, in FIG. 10B, the elastic deformation portion 331 is inserted from the insertion through hole 132a provided in the direction perpendicular to the axis of the holding member 330, as in the second embodiment. Finally, as shown in FIG. 10C, the holding cover 231 is attached as in the second embodiment. At this time, as shown in FIG. 10 (e), the elastic deformation portion 331 biases the split bearing body 121 toward the shaft body 110, so that the inner peripheral surface of the split bearing body 121 and the outer peripheral surface of the shaft body 110 are separated. Substantially abutting and independent independent frame structures are formed.

  As described above, according to the holding member 330 of the present embodiment, there are the same effects as the effects described in the first embodiment and the second embodiment. Moreover, even when it is difficult to insert the elastic deformation portion 331 and the split bearing body 121 from the same insertion port, each can be attached to the holding member. Accordingly, the elastic deformation portion 331 can be installed regardless of the size and shape of the elastic deformation portion 331.

<Fourth embodiment>
FIG. 11 shows an overall schematic view of a spherical bearing according to a fourth embodiment of the present invention, FIG. 11 (a) is a perspective view, and FIG. 11 (b) is an exploded perspective view. In addition, in this embodiment, about a part of bearing structure, since it is the same as that of 3rd Embodiment mentioned above, the overlapping description and illustration are abbreviate | omitted.

  Specifically, the elastic deformation portions of the first to third embodiments described above exist independently, whereas the spherical bearing 400 of the present embodiment is shown in FIG. As described above, the elastic deformation portion 422 common to the divided bearing bodies 121 is joined to the inner peripheral surface of the cylindrical portion of the holding member 430. In addition, the attachment procedure of each division | segmentation bearing body 121 is the same as that of 1st Embodiment mentioned above.

  As described above, the spherical bearing 400 of the present embodiment can simplify the biasing structure of each divided bearing body 121 by providing a common elastic deformation portion 422 for each divided bearing body 121. .

<Fifth Embodiment>
FIG. 12 shows an overall schematic diagram of a spherical bearing according to a fifth embodiment of the present invention. In addition, in this embodiment, about a part of bearing structure, since it is the same as that of 1st Embodiment mentioned above-4th Embodiment, the overlapping description and illustration are abbreviate | omitted.

  Specifically, the shaft bodies of the first to fourth embodiments exist independently, but the spherical bearing 500 of this embodiment is different from the shaft body 510 except that the shaft body 510 is integrated with the shaft. The mounting procedure and the degree of freedom of the shaft are the same as those in the first to fourth embodiments.

  As described above, the present embodiment has the same effects as those of the first to fourth embodiments. Further, since the shaft and the shaft body are integrated, the number of parts is reduced and the backlash is reduced. , Mechanical accuracy is improved.

<Other embodiments>
As mentioned above, although this invention was demonstrated in detail based on 1st-6th embodiment, this invention is not limited to 1st-5th embodiment mentioned above.

In the above-described first to fifth embodiments, the pressure spherical bearing has high followability to the shaft body in all cases, and is used for physical shock absorption applied to the shaft body or physical shock absorption applied to the holding means. Is also effective.

In 1st-5th embodiment mentioned above, although the holding member was demonstrated as a cylindrical member, this invention is not specifically limited to this, For example, it is good also as a member like prismatic shape.

  In addition, the shape of the elastic deformation portion in the first to fifth embodiments described above is a member such as a rubber sheet. However, the elastic deformation portion is not limited to a sheet-like member, and one or more components that can be elastically deformed are used. May be used in combination.

In the first to fifth embodiments described above, the split bearing body and the elastic deformation portion are inserted by, for example, four split bearing bodies and an elastic deformation portion. A combination of the insertion methods may be used, such as the method of inserting in the first embodiment and the remaining two inserted by the method of insertion in the second embodiment.

In the present invention, the material of the split bearing body may be alternately arranged, for example, when there are four split bearing bodies, two parts are iron, and two parts are carbon. Thereby, carbon plays a role as a lubricant, and the shaft body can move more smoothly.

  Moreover, in this invention, you may make it reduce the frictional force with respect to a shaft body by providing a groove part in the bearing surface of each division | segmentation bearing body mentioned above. In addition, such a groove part may be provided in the shape of a line with respect to the bearing surface of the shaft body, or may be provided so as to intersect with a cross shape. As a result, in addition to reducing the frictional force, it can also be used as a reservoir for avoiding dust and storing lubricant (such as grease). Moreover, such a groove part may be provided in the back surface of each division | segmentation bearing body, ie, the surface at the side of a biasing means. Thereby, free deformation can be promoted during thermal expansion.

  Note that the spherical bearing of the present invention contributes to driving stability because it is a stable bearing even in various usage environments by being applied to a bearing structure such as an office machine or an industrial machine. Further, since the spherical bearing of the present invention can realize a wide movable range, it can be applied to bearings in various fields such as movable nozzles (including deflection type nozzles) for ejecting fluid or the like, or various motor bearings. .

  As mentioned above, although this invention was demonstrated in detail, this invention also makes object also the following embodiment. For example, the present invention can also be applied to a variable nozzle device 700 in which a nozzle member 720 inserted into a pressure vessel 710 as shown in FIG. 13 is received by a spherical plain bearing. FIG. 13 is a schematic cross-sectional view of a variable nozzle device according to an embodiment of the present invention.

  Specifically, as shown in FIG. 13, the nozzle member 720 includes a skirt portion 721 having an inner diameter that gradually increases toward the tip, a small diameter portion 722 that communicates with the skirt portion 721, and an extension from the small diameter portion 722. And an annular ring portion 723 serving as a base end portion curved so as to be wound.

  In addition, the small-diameter portion 722 of the nozzle member 720 is provided with a spherical portion 724 having a part of the outer peripheral surface formed by a spherical surface 724a in the outer peripheral direction. Further, the base end side of the nozzle hole (through hole) 725 of the nozzle member 720 communicates with the pressure space 711 in the pressure vessel 710. That is, the nozzle member 720 is inserted and arranged in the pressure vessel 710 such that the spherical portion 724 of the nozzle member 720 on the base end portion (annular ring portion 723) side is substantially disposed in the pressure space 711. Yes.

  Furthermore, a spherical bearing 730 that receives the spherical portion 724 of the nozzle member 720 is provided in the nozzle mounting portion 712 in which the spherical portion 724 of the nozzle member 720 is mounted in the pressure vessel 710. Specifically, the spherical bearing 730 includes, for example, a bearing body 731 that receives the spherical portion 724 of the nozzle member 720 and a holding member 732 that holds the bearing body 731. Such a spherical bearing 730 is provided so as to protrude into the pressure vessel 710 (pressure space 711).

  A spherical bearing 730 is inserted and disposed in the inner peripheral portion of the annular ring portion 723 of the nozzle member 720. In this state, the inner peripheral portion of the annular ring portion 723 of the nozzle member 720 is in sliding contact with the outer peripheral portion of the spherical bearing 730. Further, here, a groove portion 732a is continuously provided in the outer peripheral direction of the spherical bearing 730, and an annular seal member (for example, an O-ring) 740 is disposed in the groove portion 732a.

  That is, the inner peripheral portion of the annular ring portion 723 in the nozzle member 720 described above is engaged with the outer peripheral portion of the spherical bearing 730 with the seal member 740 interposed therebetween. The annular ring portion 723 and the seal member 740 of the nozzle member 720 are in sliding contact with the rotation center of the nozzle member 720 on a concentric circle. For this reason, even if the nozzle member 720 is movable (displaced), the seal member 740 is always interposed between the nozzle member 720 and the spherical bearing 730, so that the pressure fluctuation in the pressure vessel 710 can be effectively suppressed. It becomes possible.

The spherical bearing 740 in the variable nozzle device 700 described above may adopt the structure of a spherical bearing as in the first to sixth embodiments described above. Accordingly, the movable range of the nozzle member 720 can be set wide while effectively suppressing the pressure fluctuation in the pressure vessel 710, and can be applied to various usage environments.

Claims (11)

A shaft body having a portion having an outer peripheral surface formed of a spherical surface;
A plurality of split bearing bodies that individually receive the spherical surfaces of the shaft bodies;
Biasing means for biasing the plurality of split bearing bodies arranged along the spherical surface of the shaft body toward the shaft body;
A spherical bearing, comprising: a holding member that holds the plurality of split bearing bodies biased toward the shaft body by the biasing means. The spherical surface of the shaft body is configured to be received by three or more of the divided bearing bodies,
The spherical bearing according to claim 1, wherein the three or more split bearing bodies are arranged uniformly in the outer circumferential direction with respect to the spherical surface of the shaft body. The holding means has an insertion opening that defines a space in which the shaft body is inserted and arranged,
A plurality of insertion portions into which the split bearing body can be inserted between the shaft bodies are provided in the outer peripheral direction at the opening periphery of the insertion opening portion,
Each of the plurality of insertion portions is provided with a holding portion that holds the divided bearing body by sliding the divided bearing body inserted from the insertion portion in the outer peripheral direction of the spherical surface of the shaft body. The spherical bearing according to claim 1, wherein the spherical bearing is provided.   The holding means is provided penetrating from the outer periphery on the opposite side of the insertion opening to the insertion opening, defining the space in which the shaft body is inserted and arranged, The spherical bearing according to claim 1, further comprising: a plurality of through holes into which the divided bearing bodies are inserted.   The said holding member has the cyclic | annular holding surface which surrounds the said shaft body and hold | maintains the said some division | segmentation bearing body through the said biasing means, The any one of Claim 1 thru | or 4 characterized by the above-mentioned. Spherical bearing as described.   6. The spherical surface according to claim 1, wherein the urging means includes a plurality of elastically deforming portions provided independently for each of the plurality of divided bearing bodies. bearing.   The spherical bearing according to any one of claims 1 to 6, wherein the urging means includes an elastic deformation portion provided integrally with each of the plurality of divided bearing bodies. Each of the plurality of split bearing bodies is provided in the same shape,
8. The biasing means according to claim 1, wherein each of the plurality of divided bearing bodies is biased toward the shaft body with a uniform biasing force. 9. Spherical bearing.   A rotary drive device comprising the spherical bearing according to any one of claims 1 to 8. A nozzle member having a spherical portion in which a part of the outer peripheral surface is formed of a spherical surface;
A pressure vessel defining a pressure space communicating with the nozzle hole of the nozzle member,
A spherical bearing that receives the spherical portion of the nozzle member is protruded into the pressure space and joined to a nozzle mounting portion to which the nozzle member is mounted in the pressure vessel.
A base end portion extending from the spherical portion into the pressure space of the nozzle member is in sliding contact with an outer peripheral portion of the spherical bearing with a seal member interposed therebetween,
The variable nozzle device, wherein the base end portion of the nozzle member and the seal member are in sliding contact with a rotation center of the nozzle member on a concentric circle. The spherical bearing is configured to bias a plurality of divided bearing bodies that individually receive the spherical surfaces of the spherical portion, and the plurality of divided bearing bodies arranged along the spherical surface of the shaft body toward the shaft body side. And a holding member that holds the plurality of divided bearing bodies that are urged toward the shaft body by the urging means, and the holding member is coupled to the pressure vessel. The variable nozzle device according to claim 10.

Images