JP2023105376A - Vibration suppression member for gear and gear - Google Patents

Abstract

To provide a new vibration suppression member for a gear which enables further reduction of abnormal noise, and to provide a gear including the vibration suppression member.SOLUTION: A vibration suppression member 1 for a gear includes: a fixed body 10; and an annular vibration suppression body 12. The fixed body 10 has a support part 11 and a connection part 13. The annular vibration suppression body 12 is a rubber elastic body which contacts with a surface 2a of an axial end of a gear 2. The support part 11 supports the annular vibration suppression body 12. The connection part 13 is fixed to the gear 2. The gear 2 includes at least one vibration suppression member 1 for a gear.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a gear damping member and a gear.

2. Description of the Related Art Gears made of metal such as iron are used in driving parts of machines such as vehicles. In metal gears, the generation of abnormal noises such as rattling noises and meshing noises at portions where the gears mesh with each other may pose a problem. Methods for reducing abnormal noise include a method of improving the accuracy of the gear itself, a method of dividing the gear into two parts, an inner ring and an outer ring, and press-fitting an annular shock absorber between them, as disclosed in Patent Document 1. It has been known.

JP-A-4-362346

While the method of improving the precision of the gear itself tends to lead to an increase in cost, the noise reduction effect is limited. In addition, even when using a type of gear that can generate torsional input, such as a helical gear, it is desired to further reduce abnormal noise.

An object of the present invention is to provide a novel gear damping member capable of further reducing noise, and a gear including the same.

A vibration damping member for a gear according to the present invention includes a fixed body and an annular vibration damping body, the fixed body having a support portion and a connection portion, and the annular vibration damping body being a shaft of a gear. It is a rubber elastic body contacting the surface of the direction end, the supporting part supports the annular vibration damping body, and the connecting part is fixed to the gear.

The support portion is an annular plate-shaped member, and the annular vibration damper is fixed to the support portion so as to be coaxial with the support portion and overlap the support portion in the axial direction. may

The support portion may be inclined toward the annular vibration damper in the axial direction from the radially inner side to the outer side.
The connecting portion may be a tubular portion extending from a radially inner end portion of the supporting portion toward the annular vibration damper in the axial direction.

The gear of the present invention comprises at least one gear damping member.
The gear of the present invention may have an annular slit in at least one of the axial end surfaces, and the connecting portion of the gear damping member may be fixed to the slit.

ADVANTAGE OF THE INVENTION According to this invention, the new damping member for gears which can reduce the further abnormal noise, and a gear provided with the same can be provided.

1 is a perspective view showing a meshing state in which a gear according to an embodiment of the present invention meshes with another gear; FIG. 1 is a cross-sectional perspective view showing a meshing state in which a gear according to an embodiment of the present invention meshes with another gear; FIG. 1 is a cross-sectional view showing an enlarged meshing portion where a gear meshes with another gear according to an embodiment of the present invention; FIG. 1 is a perspective view showing a gear damping member according to an embodiment of the present invention; FIG.

A gear damping member 1 according to an embodiment of the present invention and a gear 2 including the gear damping member 1 will be described below with reference to FIGS. 1 to 4. FIG. In the following description, the direction along the axis X in the drawing is called the "axial direction", the direction perpendicular to the axis X is called the "radial direction", and the direction circularly around the axis X is called the "circumferential direction". .

FIG. 1 is a perspective view showing a meshing state in which a gear 2 meshes with another gear 3. FIG. FIG. 2 is a cross-sectional view of FIG. 1 taken along a plane including the rotation axes of the gear 2 and the other gear 3. As shown in FIG. FIG. 3 is an enlarged view of a meshing portion where the gear 2 and the other gear 3 mesh with each other in a cross section cut along a plane including the respective rotation axes of the gear 2 and the other gear 3 . FIG. 4 is a perspective view of the gear damping member 1, showing the annular damping body 12 side.

[gear]
As shown in FIGS. 1 and 2, the gear 2 is a helical gear in which a plurality of teeth 21 are obliquely formed on the circumferential side of a truncated cone. The other gears 3 are also helical gears. The teeth 21 of the gear 2 and the teeth 31 of the other gear 3 are meshed with each other in a state in which the gear 2 and the other gear 3 are arranged in opposite directions. However, gear 2 and other gears 3 may be other gears such as spur gears, (non-helical) bevel gears, and the like. Furthermore, the gear 2 may be a pinion gear, in which case it may be meshed with a rack instead of the other gear 3 to form a so-called rack and pinion.

The gear 2 has a gear damping member 1 on a surface 2a (hereinafter also simply referred to as "surface 2a") at one end in the axial direction (the end on the small diameter side of the gear 2). A gear damping member 100 is provided on the surface 2b (hereinafter also simply referred to as "surface 2b") of the other end (the end on the large diameter side of the gear 2). Here, the gear damping member 100 has the same configuration as the gear damping member 1 but has a larger diameter than the gear damping member 1 .

As shown in FIG. 3, in the gear 2, an annular slit 22a centered on the axis X is formed in a surface 2a, which is an end surface extending in a direction orthogonal to the axis X. As shown in FIG. The slit 22 a is formed in an annular shape near the tooth 21 of the gear 2 so as to be coaxial with the gear 2 . The axial depth of the slit 22a is determined by the difference between the axial length (thickness) of the later-described connecting portion 13 of the gear damping member 1 and the later-described axial length (thickness) of the annular damping body 12. is also slightly deeper. The width of the slit 22a in the radial direction is the same as or slightly larger than the thickness of the later-described connecting portion 13 of the damping member 1 for gear.

Further, as shown in FIG. 3, in the gear 2, a slit is formed around the axis X with respect to the surface 2b, which is an end surface extending in a direction perpendicular to the axis X (an end surface on the opposite side to the surface 2a). An annular slit 22b having a larger diameter than 22a is formed. The slit 22 b is formed in an annular shape near the tooth 21 of the gear 2 so as to be coaxial with the gear 2 . The axial depth of the slit 22b is determined by the difference between the axial length (thickness) of the later-described connecting portion 113 of the gear damping member 100 and the later-described annular damping body 112. is also slightly deeper. The width of the slit 22b in the radial direction is the same as or slightly larger than the thickness of the later-described connecting portion 113 of the gear damping member 100 .

[Damping member for gears]
As shown in FIGS. 1 to 4, the gear damping member 1 includes a fixed body 10 and an annular damping body 12. As shown in FIGS.

The fixed body 10 has a support portion 11 and a connection portion 13 . The support portion 11 is a portion that supports an annular damping body 12 to be described later, and the connecting portion 13 is a portion that fixes the gear damping member 1 to the gear 2 via the connecting portion 13 . The support portion 11 and the connection portion 13 are integrated so that the cross section of the fixed body 10 cut along the axis X is substantially L-shaped.

The fixed body 10 is made of a metal material such as iron. However, the material of the fixed body 10 is not limited to this, and may be made of, for example, other metal such as aluminum, alloy such as stainless steel or brass, or resin. The fixed body 10 may be made of any material as long as it has higher rigidity than the ring-shaped vibration damping body 12, which will be described later. Further, the fixed body 10 may not be formed integrally from the beginning, and may be formed by connecting the support portion 11 and the connection portion 13 which are separate members.

In this embodiment, the support portion 11 is an annular plate-like member. That is, the support portion 11 has a circular shape (concentric circle) in which the radially inner end portion 11a and the radially outer end portion 11b are coaxial. It has a ring shape in which the distance to the outer end portion 11b does not change (the width in the radial direction is uniform).

As shown in FIG. 3 , the support portion 11 has an annular vibration damping body in the axial direction from the radially inner side (the radially inner end portion 11a side) toward the radially outer side (the radially outer end portion 11b side). 12 side, that is, the direction toward the gear 2 is inclined. The support portion 11 supports the annular damping body 12 on the surface on the side of the connection portion 13 , that is, on the inner surface facing the gear 2 .

In this embodiment, the connection portion 13 extends from the radially inner end portion 11 a of the support portion 11 toward the annular vibration damping body 12 in the axial direction, that is, in a direction approaching the gear 2 so as to stand up from the support portion 11 . It is a cylindrical tubular portion that exists. The axial length of the connecting portion 13 is longer than the axial length (thickness) of the annular vibration damper 12 .

The annular damping body 12 is a member that contacts the surface 2a of the axial end of the gear. The annular vibration damping body 12 has a circular shape (concentric circle) in which a radially inner end face 12a and a radially outer end face 12b are coaxial, and the radially outer end face 12a extends from the radially inner end face 12a at any part in the circumferential direction. It has a ring shape in which the distance to 12b does not change (the width in the radial direction is uniform).

The annular damping body 12 has a predetermined thickness that is longer in the axial direction than the supporting portion 11 of the fixed body 10 . However, depending on the purpose, the thickness of the annular damping body 12 in the axial direction may be the same as that of the support portion 11 or may be thinner than that of the support portion 11 .

The annular vibration damping body 12 is fixed to the inner surface of the support portion 11 near the gear 2 so as to be coaxial with the support portion 11, which is also annular, and overlap the support portion 11 in the axial direction. . That is, the inner and outer diameters of the annular damping body 12 and the inner and outer diameters of the support portion 11 are set so that the annular damping body 12 and the support portion 11 can overlap in the axial direction.

In this embodiment, the outer diameter of the annular vibration damping body 12 is approximately equal to the outer diameter of the support portion 11 . Further, in this embodiment, the inner diameter of the annular damping body 12 is larger than the inner diameter of the support portion 11 . As a result, the radially inner end surface 12 a of the annular damping body 12 is separated from the connecting portion 13 . However, the radially inner end surface 12 a of the annular damping body 12 may be in contact with the connecting portion 13 .

The annular damping body 12 is made of a rubber elastic body. Examples of materials for the rubber elastic body that can form the annular damping body 12 include thermosetting elastomers such as natural rubber and synthetic rubber, styrene, olefin, vinyl chloride, acrylic, polyamide, and polyester. and thermoplastic elastomers such as polyurethane-based elastomers. The annular damping body 12 may be made of a porous material such as urethane foam. The annular vibration damping body 12 and the support portion 11 may be fixed by vulcanization adhesion, or may be fixed using an adhesive or the like separately. Alternatively, the fixed body 10 and the annular damping body 12 may be integrally formed by insert molding or the like.

As shown in FIG. 3, the gear damping member 1 is fixed integrally with the gear 2 by press-fitting the connection portion 13 into the slit 22a. However, the connecting portion 13 and the slit 22a may be fixed with an adhesive or the like. The annular damping body 12 of the gear damping member 1 is in contact with the surface 2a of the gear 2 and the end surfaces 21a of the teeth 21 in the axial direction. Since the annular damping body 12 is sandwiched between the teeth 21 of the gear 2 and the support portion 11, it is preloaded in the axial direction and is slightly deformed.

As shown in FIGS. 2 and 3 , the gear damping member 100 includes a fixed body 110 and an annular damping body 112 . Fixed body 110 has support portion 111 and connection portion 113 . Except for the points described below, the configurations of the gear damping member 100, the fixed body 110, the annular damping body 112, the support portion 111, and the connection portion 113 and their mutual relationships are the same as those of the gear damping member 1, respectively. , the fixed body 10, the annular damping body 12, the supporting portion 11, and the connecting portion 13, and their mutual relationship, so that a partial description thereof will be omitted.

The support portion 111 is an annular plate-like member similar to the support portion 11, but the inner diameter and outer diameter of the support portion 111 are larger than the inner diameter and outer diameter of the support portion 11, respectively. The radial width of the support portion 111 is the same as the radial width of the support portion 11 . The connecting portion 113 is a cylindrical tubular portion similar to the connecting portion 13, but the inner diameter and the outer diameter of the connecting portion 113 are larger than the inner diameter and the outer diameter of the connecting portion 13, respectively.

The annular damping body 112 is a ring-shaped member similar to the annular damping body 12, but the inner diameter and the outer diameter of the annular damping body 112 are larger than the inner diameter and the outer diameter of the annular damping body 12, respectively. The radial width of the annular damping body 112 is the same as the radial width of the annular damping body 12 .

As shown in FIG. 3, the gear damping member 100 is fixed integrally with the gear 2 by press-fitting the connection portion 113 into the slit 22b. However, the connecting portion 113 and the slit 22b may be fixed with an adhesive or the like. The annular damping body 112 of the gear damping member 100 is in contact with the surface 2b of the gear 2 and the end surfaces 21b of the plurality of teeth 21 in the axial direction. Since the annular damping body 112 is sandwiched between the teeth 21 of the gear 2 and the supporting portion 111, it is preloaded in the axial direction and is slightly deformed.

In the gear 2 provided with the gear damping members 1 and 100, the annular damping bodies 12 and 112 are in contact with the teeth 21 of the gear 2, and the support portion 11 of the fixed body 10 and the support portion 111 of the fixed body 110 are in contact with each other. Since preload is applied to the annular vibration damping bodies 12 and 112 by , a vibration damping effect on the gear 2 is obtained, and abnormal noise is suppressed. In the gear 2, since the gear 2 and the teeth 21 are sandwiched between the annular vibration dampers 12 and 112, the vibration damping effect against the omnidirectional vibration of the teeth 21 caused by the force in the torsional direction is more effective. can be obtained objectively.

Further, in the gear damping members 1 and 100, the supporting portions 11 and 111 are axially inclined toward the annular damping bodies 12 and 112 from the radially inner side to the radially outer side. Therefore, even if the annular damping bodies 12 and 112 having rubber elasticity are permanently deformed due to compression set due to long-term use, the preload applied to the annular damping bodies 12 and 112 is maintained. , and the noise reduction effect of damping lasts for a long period of time.

[Other embodiments]
Although the embodiments of the present invention have been described above, the present invention is not limited to these and can be modified as appropriate without departing from the technical idea thereof.

In the above embodiment, the gear 2 has the gear damping member 1 on the surface 2a and the gear damping member 100 on the surface 2b, but the gear of the present invention is not limited to this, Only one gear damping member may be provided.

In the above-described embodiment, the supporting portion 11 of the fixed body 10 of the gear damping member 1 is an annular plate-like member, and has a ring shape with a uniform width in the radial direction. The vibration member is not limited to this, and the support portion may have an uneven pattern by providing one or more notches or projections on its inner circumference and/or outer circumference. Further, the supporting portion does not necessarily have to be an annular plate-like member. For example, a supporting portion composed of a plurality of plate-like members or wires extends radially from the inner side to the outer side in the radial direction to support the annular vibration damper. may

In the above-described embodiment, the support portion 11 of the fixed body 10 of the gear damping member 1 moves toward the radially outer end portion 11b from the radially inner end portion 11a side. 12 side, but the vibration damping member for a gear of the present invention is not limited to this, and the supporting portion may extend radially (perpendicularly to the axial direction) without being inclined. .

In the above embodiment, the connecting portion 13 of the fixed body 10 of the gear damping member 1 extends from the radially inner end portion 11a of the support portion 11 so as to rise axially toward the annular damping body 12 side. The connecting portion 13 is press-fitted into an annular slit 22a formed in the surface 2a of the gear 2, thereby fixing the gear damping member 1 to the gear 2 in an integrated state. It is However, the mode of connection between the gear damping member and the gear of the present invention is not limited to this, and any mode may be used as long as the fixed body of the gear damping member is fixed to the gear through the connecting portion. may

For example, the connecting part has a plane of any shape perpendicular to the axial direction (spreading in the radial direction), and the plane and the axial end face of the gear are fixed via an adhesive or the like. may In this case, it is not necessary to form an annular slit in the axial end face of the gear.

Further, for example, the connection portion is a plurality of pins or protrusions intermittently provided in the circumferential direction so as to rise from the radially inner end portion of the support portion toward the annular vibration damper in the axial direction, and the plurality of Pins or projections are press-fitted into a plurality of corresponding holes or recesses formed in the surface of the axial end of the gear, or fixed with an adhesive or the like, thereby forming a gear damping member. may be fixed to.

In the above-described embodiment, the annular damping body 12 of the gear damping member 1 is in contact with the surface 2 a of the gear 2 and the end surfaces 21 a of the plurality of teeth 21 in the axial direction. The vibration damping body 112 is in contact with the surface 2b of the gear 2 and the end surfaces 21b of the plurality of teeth 21 in the axial direction. However, the annular damping body of the gear damping member of the present invention may contact only the end surfaces of the gear (corresponding to the surfaces 2a and 2b in the above embodiment) without contacting the end surfaces of the teeth of the gear. . Conversely, the annular damping body of the gear damping member of the present invention may be in contact only with the end faces of the teeth of the gear.

In addition, those skilled in the art can appropriately modify the damping member for gear and the gear according to conventionally known knowledge. As long as the configuration of the present invention is still provided even with such modification, it is, of course, included in the scope of the present invention.

1,100 Gear damping member 2 Gear 2a, 2b Surface 3 Other gear 10 110 Fixed body 11 111 Support 11a Diameter direction inner end 11b... radial outer end 12, 112... annular damping body 12a... radial inner end face 12b... radial outer end face 13, 113... connection Portion 13a end portion 21 tooth 21a, 21b end face 22a, 22b slit 31 tooth X axis axis

Claims (6)

a fixed body;
and an annular damping body,
The fixed body has a support portion and a connection portion,
The annular damping body is a rubber elastic body that contacts the surface of the axial end of the gear,
The support portion supports the annular damping body,
A vibration damping member for a gear, wherein the connecting portion is fixed with respect to the gear. The support portion is an annular plate-shaped member,
The annular damping body is fixed to the support portion so as to be coaxial with the support portion and overlap the support portion in the axial direction,
A vibration damping member for a gear according to claim 1. The support portion is axially inclined toward the annular vibration damping body from the radially inner side toward the outer side.
A vibration damping member for a gear according to claim 1 or 2. The connection portion is a cylindrical portion extending from the radially inner end of the support portion toward the annular vibration damper in the axial direction.
A gear damping member according to any one of claims 1 to 3. A gear comprising at least one gear damping member according to any one of claims 1 to 4. said gear has an annular slit in at least one of its axial end faces;
The connecting portion of the gear damping member is fixed to the slit,
A gear according to claim 5.

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