JP2015151930A - Vibration control hub for crossflow fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration control hub for a crossflow fan having a new structure in which a fixing screw is eliminated at an engaging structure in a circumferential direction against a driving shaft so as to simplify it, a degree of freedom in design such as a spring characteristic is assured to be high while a large-sized formation of an outer diameter size is being restricted and a vibration control performance can also be attained.SOLUTION: A vibration control hub 10 for a crossflow fan of this invention is constituted in such a way that an opposing surface of a shaft side connecting plate 14 and an opposing surface of a fan side connecting plate 16 that are oppositely arranged in an axial direction are connected by a resilient body 18 and at the same time, an inner circumferential surface of the shaft side connecting plate 14 is provided with an engaging part 28 for a driving shaft 24 and in turn they are installed in such a way that an inner circumferential surface of the resilient body 18 is installed in an insertion hole 26 of the driving shaft 24 while being directly faced against an outer circumferential surface of the driving shaft 24.

Description

  The present invention relates to an anti-vibration boss for a cross flow fan in an air conditioner or the like, and more particularly to an anti-vibration boss for a cross flow fan that is attached to a transmission portion of a rotational driving force from a drive shaft to the cross flow fan.

  Conventionally, a cross flow fan is known as a kind of blower, and is used as a blower for an air conditioner, a circulator, an air curtain, a fan coil unit, or the like. Such a cross flow fan is generally composed of a plurality of sheets extending in parallel with the rotation center axis as disclosed in Japanese Patent Application Laid-Open No. 2004-124940 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2010-229886 (Patent Document 2). The blades are arranged at a predetermined interval on the circumference around the rotation center axis, and both ends of each blade are supported by a pair of side plates.

  Then, one side plate side of the cross flow fan is supported by a bearing so as to be rotatable around the rotation center axis, and the other side plate side is connected to and attached to a drive shaft such as a rotation output shaft of an electric motor. Under such a mounted state, the cross flow fan is rotated around the rotation center axis to generate an airflow in a direction perpendicular to the rotation center axis.

  By the way, in such a cross flow fan, in order to meet demands such as noise reduction, vibration reduction, and improvement in durability during rotation operation, a transmission part of the rotational driving force from the drive shaft to the cross flow fan has been conventionally used. Is equipped with anti-vibration bosses. Such an anti-vibration boss is generally separated from the outer peripheral side of a bearing sleeve, which is externally attached to the drive shaft and fixed by a fixing screw, as shown in Patent Documents 1 and 2, and the side plate of the cross flow fan. A large-diameter ring-shaped connecting member that is fixed to the outer periphery is arranged, and the bearing sleeve and the connecting member are connected in the radial direction by a rubber elastic body.

  However, with such a conventional anti-vibration boss for crossflow fans, the bearing sleeve must be fastened and fixed to the drive shaft with a fixing screw. There was a problem that it was necessary to secure a work space for detachment. In particular, when a fixing screw is provided on the inner peripheral side of the blades of the cross flow fan, the blades cannot be provided partially on the periphery to secure a work space for attaching and detaching the fixing screws. There was also an unfavorable situation regarding.

  In addition, the conventional cross-flow fan has a structure in which a rubber elastic body is disposed between the bearing sleeve and the connecting member in the radial direction. Compression deformation is dominant in the direction perpendicular to the axis, while shearing is performed in the axial direction. Since the deformation is dominant, there are cases where it is difficult to achieve the required vibration isolation performance.

  Furthermore, since the rubber elastic body and the connecting member are sequentially arranged in the radial direction on the outer peripheral surface of the bearing sleeve, if the radial free length of the rubber elastic body is increased, the outer diameter dimension of the entire vibration isolating boss is increased. turn into. Therefore, there is also a problem that it is difficult to obtain a sufficient degree of freedom in designing the spring characteristics of the rubber elastic body due to the restriction of the outer diameter size of the vibration-proof boss.

JP 2004-124940 A JP 2010-229886 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is to completely eliminate the problem that the blades cannot be partially provided for attaching and detaching the fixing screw. For a cross-flow fan with a new structure that can improve vibration isolation performance and can also ensure a large degree of freedom in design of spring characteristics while avoiding an increase in outer diameter size. It is to provide an anti-vibration boss.

  A first aspect of the present invention made to solve such a problem is a cross flow that is arranged between a drive shaft and a cross flow fan and transmits a rotational driving force of the drive shaft to the cross flow fan. In the anti-vibration boss for a fan, the shaft-side connecting plate and the fan-side connecting plate are arranged to face each other at a predetermined distance in the axial direction, and the shaft-side connecting plate and the fan-side connecting plate are arranged between the opposing surfaces. While being connected by an elastic body, an engagement portion that engages with the outer peripheral surface of the drive shaft and prevents relative rotation is provided on the inner peripheral surface of the shaft-side connecting plate. And an insertion hole of the drive shaft is provided through the elastic body and the fan-side connecting plate, and the inner peripheral surface of the elastic body is mounted directly facing the outer peripheral surface of the drive shaft. The cross that has become An anti-vibration boss for low fan, and features.

  In the anti-vibration boss for a crossflow fan configured according to this aspect, the rotational driving force is generated by engaging the inner peripheral surface of the shaft coupling plate and the outer peripheral surface of the drive shaft in the circumferential direction at the engaging portion. There is no need to tighten with a fixing screw. Therefore, the problem that the blades cannot be partially provided for the attaching / detaching operation of the fixing screw in the vibration isolating boss for the cross flow fan having the conventional structure can be solved.

  Moreover, in the elastic body which mutually connects a shaft side connection plate and a fan side connection plate between axial direction opposing surfaces, with respect to the input vibration between a shaft side connection plate and a fan side connection plate, in an axial direction While compression deformation is dominant, shear deformation is dominant in the torsional direction and the direction perpendicular to the axis. Therefore, excellent anti-vibration performance is exhibited against torsional direction input vibration and input vibration in the direction perpendicular to the axis due to drive torque fluctuations and the like that are likely to be problematic. On the other hand, since a relatively large spring rigidity is exhibited in the twisting direction of the crossflow fan, an unstable displacement like a neck swing is effectively suppressed, and a stable rotational operation can be achieved.

  Furthermore, not only the shaft side connecting plate but also the elastic body is provided with an insertion hole for the drive shaft so that the inner peripheral surface of the elastic body faces the outer peripheral surface of the drive shaft directly. Therefore, it is not necessary to secure a space for arranging the bearing sleeve on the inner periphery of the elastic body unlike the vibration-proof boss for the cross-flow fan having the conventional structure. Therefore, it is possible to secure the volume of the elastic body while keeping the outer diameter dimension of the elastic body compact, while ensuring the required characteristics such as size restrictions on the installation space and spring characteristics and durability, It is also possible to obtain design freedom.

  In addition, since the fixing area of the shaft-side connecting plate and the fan-side connecting plate can be secured on both sides in the axial direction of the elastic body, rubber is provided on the outer periphery of the bearing sleeve like a conventional vibration-proof boss for crossflow fans. Compared to the structure in which the elastic body and connecting members are arranged sequentially in the radial direction, the overall outer diameter is kept compact, and the fixing strength and durability of the shaft-side connecting plate and fan-side connecting plate to the elastic body are sufficient. It is also possible to secure it.

  A second aspect of the present invention is the anti-vibration boss for a crossflow fan according to the first aspect, wherein the shaft side connecting plate and the fan side connecting plate are both substantially ring-shaped. A flat annular axial outer surface located on the opposite side to the opposing surface of the shaft side connecting plate and the fan side connecting plate is the outermost surface on both sides in the axial direction.

  In the anti-vibration boss for a crossflow fan configured according to this aspect, the shaft-side connecting plate and the fan-side connecting plate are positioned directly on the outermost surfaces on both sides in the axial direction with a molding die or the like. An elastic body can be formed between the fan-side connecting plate and the fan-side connecting plate. Therefore, the parallelism between the shaft side connecting plate and the fan side connecting plate can be easily realized with high accuracy, and the product accuracy can be improved.

  A third aspect of the present invention is the anti-vibration boss for a cross flow fan according to the first or second aspect, wherein the shaft side connecting plate has a smaller diameter than the fan side connecting plate, The outer peripheral surface of the elastic body has a tapered shape in which the diameter increases from the shaft side connecting plate toward the fan side connecting plate.

  In the anti-vibration boss for a crossflow fan configured according to this embodiment, the shaft side connecting plate connected to the drive shaft on the inner peripheral side is made compact without unnecessarily increasing the diameter, while the fan side connecting plate is The connecting portion to the cross flow fan can be secured on the outer peripheral side with a large diameter. In addition, since the outer peripheral surface of the elastic body has a tapered shape, it is possible to attach the axial draft taper of the molding die from the large-diameter fan-side coupling plate to the small-diameter shaft-side coupling plate. For example, by setting the outer diameter dimension of the shaft side connecting plate to be equal to or smaller than the outer diameter dimension of the elastic body, the molding die for the elastic body can be punched in the axial direction from the shaft side connecting plate side.

  A fourth aspect of the present invention is the anti-vibration boss for a crossflow fan according to any one of the first to third aspects, wherein the insertion hole of the shaft side connecting plate has a D-cut cross section. The engaging portion is configured, and the drive shaft having a corresponding cross-sectional shape is inserted to prevent relative rotation.

  In the anti-vibration boss for a cross flow fan according to any one of the first to third aspects, the inner peripheral surface of the shaft-side connecting plate and the outer peripheral surface of the drive shaft are formed in any non-circular irregular shape corresponding to each other. It is possible to engage in the circumferential direction, and it is also possible to provide a key groove and a key between the inner and outer peripheral surfaces to engage in the circumferential direction. Here, according to this aspect, by adopting the engaging portion having the D-cut cross section, it is possible to realize a strong circumferential engaging force with a simple structure, which is more practical.

  As is clear from the above description, in the anti-vibration boss for a crossflow fan structured according to the present invention, the fixing screw is not required by directly engaging the shaft side connecting plate with the drive shaft. The problem that the blades cannot be partially provided due to the screw mounting / removal work is solved, and the anti-vibration performance can be improved by lowering the direction perpendicular to the axis and the torsional direction by shear deformation of the elastic body. The elastic body volume and spring characteristics can be freely designed while reducing the diameter of the elastic body by making the inner circumferential surface of the elastic body directly opposed to the outer circumferential surface of the drive shaft in the radial direction. It is also possible to ensure a large degree.

The longitudinal cross-sectional view which shows the anti-vibration boss for crossflow fans as one Embodiment of this invention. The right view in FIG. The left view in FIG. The principal part expansion explanatory drawing in FIG. FIG. 2 is a longitudinal sectional explanatory view schematically showing a usage state of a vibration isolating boss for a crossflow fan shown in FIG. 1.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, an anti-vibration boss 10 for a crossflow fan according to an embodiment of the present invention is shown in FIG. 1 in a longitudinal section along a rotation center axis 12, and the right side surface and the left side surface thereof are as shown in FIG. 3 and further details of the central portion in FIG. 1 are shown enlarged in FIG.

  In the vibration isolating boss 10 of this embodiment, a shaft-side connecting plate 14 and a fan-side connecting plate 16 which are opposed to each other with a predetermined distance on the rotation center shaft 12 are elastically connected by a rubber elastic body 18 as an elastic body. It has a structure. The anti-vibration boss 10 is used as, for example, a component of an air conditioner, and is coaxially disposed on the rotation center shaft 21 of the cross flow fan 20 as shown in FIG. It is mounted on the transmission path of the rotational driving force from the drive shaft 24 that is the output shaft of the motor to the cross flow fan 20.

  More specifically, the shaft-side coupling plate 14 constituting the vibration-proof boss 10 is substantially omitted as a whole by forming an insertion hole 26 penetrating on the central axis in the central portion of a flat plate having a circular outer periphery. It has a substantially annular plate shape with a certain thickness. The insertion hole 26 has an irregular shape in which the inner diameter dimension is partially different in the circumferential direction. In the present embodiment, the insertion hole 26 has a D-shaped cross-sectional shape in which one place on the circumference is linear in the chord direction. Yes. An engaging portion 28 for the drive shaft 24 is constituted by a linear portion extending in the chord direction of the D-shaped cross section.

  The shaft side connecting plate 14 is preferably formed of a material having high rigidity such as a metal material such as an aluminum alloy or a hard synthetic resin material subjected to fiber reinforcement or the like as necessary. In addition, the thickness dimension is preferably 2 mm or more, so that the engagement strength of the engagement portion 28 with respect to the drive shaft 24, such as the strength and accuracy of assembly of the insertion hole 26 with the drive shaft 24, is ensured. Reliability can be improved.

  On the other hand, the fan-side connecting plate 16 is also substantially constant as a whole by forming an insertion hole 30 penetrating on the central axis in the central portion of the flat plate having a circular outer periphery, like the shaft-side connecting plate 14. It has a substantially annular plate shape with a thickness. The insertion hole 30 has the same or slightly larger inner diameter as the insertion hole 26 of the shaft-side connecting plate 14, but unlike the insertion hole 26 of the shaft-side connecting plate 14, it has the same central axis as the outer peripheral surface. It is formed with a cylindrical inner peripheral surface shape. As the material of the fan side connecting plate 16, similarly to the shaft side connecting plate 14, a highly rigid metal material or a hard synthetic resin material is preferably employed.

  Further, the fan side connecting plate 16 has a larger outer diameter than the shaft side connecting plate 14, and a connecting portion 32 to the cross flow fan 20 is formed in the outer peripheral portion thereof. On the other hand, the inner peripheral portion of the fan side connecting plate 16 is a fixing portion 34 to the rubber elastic body 18. In addition, an outer peripheral side through hole 36 and an inner peripheral side through hole 38 penetrating in the thickness direction are respectively formed on the outer peripheral portion and the inner peripheral portion of the fan side connecting plate 16 constituting the connecting portion 32 and the fixing portion 34. A plurality are formed at a predetermined distance in the circumferential direction.

  The shaft-side connecting plate 14 and the fan-side connecting plate 16 are arranged coaxially on the extension line of each central axis and at a predetermined distance from each other on the central axis. Thereby, the axial inner surfaces 40 and 42 facing each other are opposed to each other in parallel, and are connected to each other by the rubber elastic body 18 disposed between the facing surfaces.

  The rubber elastic body 18 has a cylindrical or disk-like block shape extending between opposed surfaces of the shaft-side connecting plate 14 and the fan-side connecting plate 16, and an insertion hole 44 is provided through the central axis. ing. The insertion hole 44 has substantially the same circular cross-sectional shape as the insertion hole 30 of the fan-side connection plate 16 and has the same center as the insertion hole 30 of the fan-side connection plate 16 and the insertion hole 26 of the shaft-side connection plate 14. The inner peripheral surface shape is mutually continuous on the shaft.

  The outer peripheral surface 46 of the rubber elastic body 18 has a tapered shape that gradually increases in diameter in the axial direction from the shaft side connecting plate 14 toward the fan side connecting plate 16. The outer diameter of the axial end on the small diameter side is the same as or slightly larger than the outer diameter of the shaft-side connecting plate 14. The outer diameter dimension of the end portion in the axial direction on the large-diameter side is set to a size located in the middle in the radial direction of the fan-side connecting plate 16.

  Thereby, the small-diameter side end surface 48 of the rubber elastic body 18 is fixed by vulcanization bonding or the like over substantially the entire axial inner surface 40 of the shaft-side connecting plate 14. Further, the large-diameter side end surface 50 of the rubber elastic body 18 is fixed to the fixing portion 34 provided on the inner peripheral portion of the axially inner surface 42 of the fan-side connecting plate 16 by vulcanization bonding or the like over substantially the entire surface. ing. Furthermore, in the fixing portion 34 of the fan side connecting plate 16, the rubber elastic body 18 is also filled in the inner peripheral side through hole 38 so as to increase the fixing area and the fixing force.

  In particular, in the present embodiment, the rubber elastic body 18 is vulcanized between the opposed surfaces 40 and 42 of the shaft side connecting plate 14 and the fan side connecting plate 16, so that the shaft side connecting plate 14 and the fan side connecting plate 16 are made. A rubber elastic body 18 is formed as an integral vulcanized molded product. Further, the axial outer surfaces 52 and 54 of the shaft side connecting plate 14 and the fan side connecting plate 16 are the outermost surfaces on both sides in the axial direction of the vibration isolating boss 10. Can be positioned by superimposing the axially outer surfaces 52 and 54 of the shaft-side connecting plate 14 and the fan-side connecting plate 16, which are each flat with respect to the inner surface of the molding cavity of the molding die. From this, it becomes possible to ensure the parallelism etc. of the shaft side connecting plate 14 and the fan side connecting plate 16 with high accuracy and stability, and further improvement in product accuracy and reliability can be achieved.

  Further, since the outer peripheral surface 46 of the rubber elastic body 18 is tapered, for example, a cylindrical mold that is continuous in the circumferential direction without dividing the vulcanization mold of the rubber elastic body 18 on the circumference is used. It is also possible to remove the die in the axial direction toward the shaft side connecting plate 14 side. The taper angle of the outer peripheral surface 46 of the rubber elastic body 18 can be arbitrarily set. However, the fixing area to the axial inner surface 42 of the fan-side connecting plate 16 and the die-cutting property in the axial direction can be secured satisfactorily. For this reason, the taper angle is preferably 2 degrees or more, and more preferably 5 degrees or more.

  Furthermore, the axial dimension of the rubber elastic body 18 is designed in consideration of required characteristics, but is preferably 5 mm or more, more preferably 10 mm or more in consideration of vibration-proof performance and durability. Formed with axial dimensions. The material of the elastic body can be set as appropriate in consideration of the required anti-vibration performance, driving force transmission performance and durability. Specifically, for example, a diene rubber, a synthetic rubber having a methylene group, or the like can be suitably employed. However, for example, a resin-based elastomer material having elasticity or the like can also be employed.

  Thus, the vibration isolating boss 10 having the above-described structure is used by being mounted on the cross flow fan 20 as shown in FIG. Such a cross flow fan 20 is conventionally well-known, and a pair of substantially disc-shaped side plates 60 and 62 are disposed opposite to each other on the same rotation center shaft 21 with a predetermined distance in the axial direction. It has a schematic structure in which a plurality of blades 66 are provided between the opposing surfaces of the side plates 60 and 62. The plurality of blades 66 have, for example, a cross-sectional shape curved in an arc shape and extend in parallel with the rotation center shaft 21. The plurality of blades 66 are arranged at a predetermined interval on the circumference around the rotation center shaft 21. The outer peripheral portions of the pair of side plates 60 and 62 are supported.

  Further, a support shaft 68 protruding outward on the rotation center shaft 21 is fixed to one side plate 60 on the right side in FIG. 5, and this support shaft 68 is illustrated via a bearing 70. It is supported rotatably by the frame of the air conditioner that does not. Furthermore, a circular through hole 72 is formed in the central portion of the other side plate 62 on the left side in FIG.

  Further, an electric motor 22 is disposed on the left side of the cross flow fan 20 and supported by the frame of the air conditioner. The drive shaft 24 of the electric motor 22 protrudes toward the through hole 72 of the side plate 62 of the cross flow fan 20 on the same central axis as the rotation center axis 21 of the cross flow fan 20.

  The drive shaft 24 of the electric motor 22 is elastically connected to the side plate 62 of the cross flow fan 20 via the vibration isolating boss 10. Thereby, the cross flow fan 20 is rotatably supported at both end portions on the rotation center shaft 21 and is rotated by the rotational driving force of the electric motor 22.

  Here, in the vibration isolating boss 10, the outer peripheral portion of the fan side connecting plate 16 is fixed to the inner peripheral portion of the through hole 72 of the side plate 62. In particular, in the present embodiment, when the side plate 62 made of a synthetic resin material is molded, the fan-side coupling plate 16 is insert-molded with a predetermined radial width at the outer peripheral portion, etc. Is fixed in a welded state. In addition, in the connection part 32 of the fan side connection plate 16, the resin material of the side plate 62 is also filled in the outer peripheral side through-hole 36 to increase the fixing area and the fixing force.

  In addition, a drive shaft 24 of the electric motor 22 is arranged in a penetrating manner on the rotation center shaft 12 of the vibration isolating boss 10, and is inserted from the insertion hole 30 of the fan side connecting plate 16 constituting the vibration isolating boss 10. The rubber elastic body 18 is inserted into the insertion hole 26 of the shaft side connecting plate 14 through the insertion hole 44 of the rubber elastic body 18.

  The outer diameter of the drive shaft 24 is substantially the same as or slightly larger than the inner diameter of the insertion holes 30, 44, and 26 of the vibration isolating boss 10. Further, the outer peripheral surface of the drive shaft 24 has an outer shape with a modified cross section corresponding to the engaging portion 28 of the shaft side connecting plate 14 at least at the tip portion extending from the tip to the insertion hole 26 of the shaft side connecting plate 14. . Specifically, it extends in the axial direction with a D-shaped cross section corresponding to the engaging portion 28, and is engaged with the engaging portion 28 in a state of being inserted into the insertion hole 26 of the shaft side connecting plate 14. The drive shaft 24 is engaged with the shaft-side connecting plate 14 so as not to be relatively rotatable in the circumferential direction.

  Note that the drive shaft 24 is not engaged in the circumferential direction at the portion where the vibration isolating boss 10 is inserted into the insertion holes 30 and 44, and relative to the fan-side connecting plate 16 and the rubber elastic body 18 in the circumferential direction. Displacement is allowed.

  As a result, the rotational drive shaft 12 of the anti-vibration boss 10 is coaxially arranged on the rotational central shaft 21 of the cross flow fan 20, and rotational drive force is applied to the cross flow fan 20 from the drive shaft 24 of the electric motor 22. introduce. That is, the rotational driving force of the drive shaft 24 is transmitted to the shaft side coupling plate 14 through the engaging portion 28, and transmission of the direct rotational driving force to the fan side coupling plate 16 and the rubber elastic body 18 is avoided. The The rotational driving force exerted on the shaft side connecting plate 14 is transmitted to the fan side connecting plate 16 via the rubber elastic body 18 so that the cross flow fan 20 rotates together with the fan side connecting plate 16. Will be.

  When transmitting the driving force, the rubber elastic body 18 is shear-deformed around the rotation center shaft 12 serving as the driving force transmission direction. Anti-vibration performance can be demonstrated. Further, since the elastic deformation of the rubber elastic body 18 dominates the displacement vibration in the direction perpendicular to the axis of the cross flow fan 20, a high damping effect by the rubber material is exhibited. An excellent vibration insulation effect due to a low dynamic spring action and a resonance and vibration suppression effect due to a high damping action are exhibited against vibration vibration in the direction perpendicular to the axis of the fan 20.

  On the other hand, the compression deformation is dominant over the rubber elastic body 18 with respect to the vibration in the bending direction in which the rotation center shaft 21 of the cross flow fan 20 is inclined with respect to the rotation center shaft 12 of the drive shaft 24 serving as a support shaft. Therefore, large spring rigidity is exhibited. As a result, the neck-like tilting of the cross flow fan 20 is suppressed, and the cross flow fan 20 can be stably rotated around the rotation center axis 21.

  In particular, in the present embodiment, since the inner peripheral surfaces of the rubber elastic body 18 and the fan side connecting plate 16 are arranged close to or in contact with the outer peripheral surface of the drive shaft 24, the neck in the cross flow fan 20 is arranged. In the pretension-like tilting, the rubber elastic body 18 and the fan-side connecting plate 16 can also exert a stopper-like function by contacting the drive shaft 24 in the radial direction, and the large tilting of the crossflow fan 20 is more effective. Can be prevented.

  Further, in the vibration isolating boss 10 of the present embodiment, the shaft side connecting plate 14 is engaged with the drive shaft 24 in a circumferentially concave and convex engagement structure so as not to be relatively rotatable. By simply inserting in the axial direction, it can be engaged and mounted. Therefore, it is not necessary to attach a fixing screw as in the cross flow fan of the conventional structure, and it is not necessary to secure a work space required for attaching and detaching the fixing screw.

  Furthermore, the inner peripheral surface of the insertion hole 44 of the rubber elastic body 18 directly faces the outer peripheral surface of the drive shaft 24 inserted therethrough, and is close to the outer peripheral surface of the drive shaft 24 with rubber. An elastic body 18 is disposed. Therefore, since the inner diameter dimension of the rubber elastic body 18 can be set sufficiently small, the volume of the rubber elastic body 18 can be secured while suppressing the increase in the outer diameter of the rubber elastic body 18. In addition, the degree of freedom in design can be improved in consideration of the spring characteristics and durability.

  Furthermore, in the vibration isolating boss 10 of this embodiment, the shaft-side coupling plate 14 and the fan-side coupling plate in which the rubber elastic body 18 is fixed to the shaft-side coupling plate 14 and the fan-side coupling plate 16 in a substantially disc shape. Since it is composed of 16 axial planes, the rubber elastic body 18 can be efficiently secured to the shaft side connecting plate 14 and the fan side connecting plate 16 while keeping the axial dimension of the vibration isolating boss 10 small. Is possible.

  As mentioned above, although embodiment of this invention has been explained in full detail, this invention is not limitedly interpreted by the specific description in this embodiment. For example, the shape of the engaging portion 28 to the drive shaft 24 in the shaft-side connecting plate 14 includes various uneven engagement structures including an oval cross section, a polygonal cross section, a star cross section, etc. in addition to the illustrated D-shaped cross section, Further, a fitting structure of a key and a key groove can be appropriately employed and is not limited.

  Further, in the shaft side coupling plate 14, an engagement cylinder portion that protrudes axially outward from the inner peripheral edge portion is provided, and an engagement that is engaged with the drive shaft 24 on the inner peripheral surface of the engagement cylinder portion. It is also possible to form a joint. If such an engagement cylinder part is employ | adopted, it will also become possible to make the thickness dimension of shaft side connection board 14 itself small, ensuring the engagement intensity | strength etc. to the drive shaft 24. FIG.

  Furthermore, a rubber layer having a predetermined thickness may be fixedly formed by wrapping the rubber elastic body 18 to the inner peripheral surface or the axially outer surface of the fan side connecting plate 16. By forming such a rubber layer, it is possible to increase the fixing area of the rubber elastic body 18 with respect to the fan-side connecting plate 16 and to make a hitting sound when the fan-side connecting plate 16 strikes the drive shaft 24. And the impact can be reduced.

  Furthermore, the anti-vibration boss to which the present invention is applied is not limited to the cross flow fan that is supported on both sides in the axial direction as shown in the above-described embodiment, but one of the rotation center shafts such as a multiblade fan. The present invention can also be applied to a fan structure that is supported in a cantilever state only on the side. For example, in the cross flow fan 22 of the above-described embodiment, it is possible to realize an aspect in which a shaft support structure by the bearing 70 of the right support shaft 68 in FIG. 5 is not provided.

  In addition, although not enumerated one by one, the present invention can be carried out in an embodiment to which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art, and such an embodiment is the gist of the present invention. It goes without saying that all are included in the scope of the present invention without departing from the scope of the present invention.

10: (For cross flow fan) Anti-vibration boss, 14: Shaft side connection plate, 16: Fan side connection plate, 18: Rubber elastic body, 20: Cross flow fan, 24: Drive shaft, 26, 30, 44: Insertion Hole, 28: engaging portion, 40, 42: axial inner surface, 46: outer peripheral surface, 52, 54: axial outer surface

Claims (4)

In the anti-vibration boss for the cross flow fan that is arranged between the drive shaft and the cross flow fan and transmits the rotational driving force of the drive shaft to the cross flow fan.
The shaft-side connecting plate and the fan-side connecting plate are arranged to face each other with a predetermined distance in the axial direction, and the shaft-side connecting plate and the fan-side connecting plate are connected by an elastic body disposed between the opposing surfaces. And an engaging portion that engages with the outer peripheral surface of the drive shaft on the inner peripheral surface of the shaft-side connecting plate to prevent relative rotation,
An insertion hole for the drive shaft is provided through the shaft side coupling plate, the elastic body, and the fan side coupling plate, and the inner peripheral surface of the elastic body directly faces the outer peripheral surface of the drive shaft. Anti-vibration boss for crossflow fans, characterized in that   The shaft-side connecting plate and the fan-side connecting plate are both substantially ring-shaped, and a flat annular shaft is located on the opposite side of the opposed surface of the shaft-side connecting plate and the fan-side connecting plate. The anti-vibration boss for a crossflow fan according to claim 1, wherein the outer surface in the direction is the outermost surface on both sides in the axial direction.   The shaft-side connecting plate has a smaller diameter than the fan-side connecting plate, and the outer peripheral surface of the elastic body has a tapered shape in which the diameter increases from the shaft-side connecting plate toward the fan-side connecting plate. The anti-vibration boss for a crossflow fan according to claim 1 or 2.   The insertion hole of the shaft side connecting plate has a D-cut cross section to constitute the engaging portion, and the drive shaft having a corresponding cross sectional shape is inserted to prevent relative rotation. The anti-vibration boss for a crossflow fan according to any one of claims 1 to 3.

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