JP2021089012A - Power transmission component, manufacturing method of the same, and power transmission mechanism - Google Patents

Abstract

To provide a power transmission component which is formed by combining members formed by different metals and enables improvement of vibration and sound damping effect.SOLUTION: A power transmission component has: an annular bearing; an annular power transmission part in which teeth are arranged in a circumferential direction on an outer peripheral surface and which is formed of a metal; and an annular connection part which is disposed between the bearing and the power transmission part, connects the bearing with the power transmission part, and is formed of a metal. The connection part is formed of a metal different from that of the power transmission part. Cavities are partially formed on an interface between the bearing and the connection part and an interface between the connection part and the power transmission part.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a power transmission component, a method for manufacturing the power transmission component, and a power transmission mechanism.

A power transmission mechanism that transmits power by combining a plurality of gears is known. For example, a vehicle uses a power transmission mechanism in which a metal gear is combined with a transmission or the like for transmitting the power generated by the prime mover to the vehicle body.

Gears generate vibrations and noise when they engage adjacent gears. Especially in gears having metal teeth, the above-mentioned vibration and sound are remarkably generated. In order to attenuate the generation of vibration and sound, gears that combine different materials in part are being studied.

For example, in Patent Document 1, a metal support portion having a shaft hole and a metal external tooth portion having external teeth that mesh with other gears are provided by a resin connecting portion filled between them. The connected gears are listed. Patent Document 1 describes that the resin-made connecting portion has an action of attenuating the vibration applied to the external tooth portion.

Further, in Patent Document 2, an annular groove portion is provided on the surface of the main body portion made of a high hardness material such as carbon steel, chrome steel, and chrome molybdenum steel, and the natural vibration transition of ductile cast iron, hot rolled steel sheet, etc. is observed. A gear is described in which a vibration-proof plate made of a lower material is press-fitted into the annular groove. According to Patent Document 2, since the press-fitted anti-vibration plate is not adhered to the main body portion, it is described that the press-fitted anti-vibration plate vibrates at a frequency different from that of the main body portion to attenuate the vibration of the main body portion.

Japanese Unexamined Patent Publication No. 2014-214833 Japanese Unexamined Patent Publication No. 2016-056815

As described in Patent Document 1 and Patent Document 2, gears that combine members formed of different materials in order to dampen vibration are known.

However, as described in Patent Document 1, in a gear that combines members formed of resin, the resin shrinks when the resin is cured during manufacturing, and the connection strength between the external tooth portion and the connecting portion decreases. It ends up.

Further, a gear in which members made of different metals are combined tends to have a inferior damping effect as compared with a gear in which members made of resin members are combined. Further, as described in Patent Document 2, the gear that fits the anti-vibration plate made of different metals into the main body generates vibration and sound due to the collision between the anti-vibration plate and the main body during rotation. The expected vibration suppression effect was not exhibited.

An object of the present disclosure is a power transmission component formed by combining members made of different metals and capable of enhancing the damping effect of vibration and sound, a method for manufacturing the power transmission component, and a power having the power transmission component. The purpose is to provide a transmission mechanism.

The power transmission component according to one aspect is arranged between the annular bearing, a metal and annular power transmission portion in which a plurality of teeth are arranged in the circumferential direction on the outer peripheral surface, and the bearing and the power transmission portion. It has a metal and annular connecting portion that connects the bearing and the power transmitting portion. The connection portion is made of a metal different from the power transmission portion, and a gap is partially formed at the interface between the bearing and the connection portion or the interface between the connection portion and the power transmission portion.

Further, the method for manufacturing a power transmission component according to one aspect is to form a metal and annular power transmission portion in which a plurality of teeth are arranged in the circumferential direction on the outer peripheral surface and a ring coaxial with the power transmission portion. A step of preparing an arranged annular bearing, a step of inserting and arranging a metal member made of a metal different from the power transmission portion between the power transmission portion and the bearing, and the metal member. The step of pressurizing from both sides in the insertion direction, and the pressurization partially forms a gap at the interface between the bearing and the connecting portion or the interface between the connecting portion and the power transmission portion. To do.

Further, the power transmission mechanism according to one aspect includes the power transmission component described above or a power transmission component manufactured by the above method.

According to the present disclosure, a power transmission component formed by combining members made of different metals and capable of enhancing the damping effect of vibration and sound, a method for manufacturing the power transmission component, and a power having the power transmission component. A transmission mechanism is provided.

FIG. 1 is a plan view showing a schematic configuration of a gear according to an embodiment. FIG. 2 is a cross-sectional view cut along a plane parallel to the radial direction of the gear along the region AA of the alternate long and short dash line shown in FIG. FIG. 3 is a cross-sectional view cut along a plane parallel to the axial direction of the gear 100 along the region BB of the alternate long and short dash line shown in FIG. FIG. 4A is a schematic cross-sectional view showing how the bearing and the power transmission unit are set in the mold in the gear manufacturing method according to the embodiment, and FIG. 4B shows a metal member arranged between the bearing and the power transmission unit. FIG. 4C is a schematic cross-sectional view showing how the metal member is pressed from both sides in the axial direction (both sides in the insertion direction) using a mold. FIG. 5A is a schematic cross-sectional view showing how a composite in which the space between the bearing and the power transmission portion is filled with a metal member is obtained in the gear manufacturing method according to the embodiment, and FIG. 5B is a schematic cross-sectional view showing the outside. It is a schematic cross-sectional view which shows the mode that the metal member which partially covers a side surface is removed, and the gear is obtained. FIG. 6 is a schematic plan view showing a gear provided with a notch portion that discontinues the second interface in the circumferential direction on the inner peripheral surface side of the power transmission portion.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The embodiments described below are examples, and the present invention is not limited to the following embodiments.

FIG. 1 is a plan view showing a schematic configuration of a gear according to an embodiment.

The gear 100 is arranged between the annular bearing 110, the annular and metal power transmission unit 120 in which a plurality of teeth are arranged in the circumferential direction on the outer peripheral surface, and the bearing 110 and the power transmission unit 120. It has an annular and metal connection 130.

The bearing 110, the power transmission unit 120, and the connection unit all have an annular shape centered on the same rotation shaft O, and rotate coaxially around the rotation shaft O. In the present specification, the direction along the rotation axis O of the gear is referred to as "axial direction", the radial direction centered on the rotation axis O of the gear is referred to as "diametrical direction", and the direction along the rotation axis O of the gear. Is called "circumferential direction".

The bearing 110 is an annular member, and a hole 112 through which a rotating shaft (not shown) is inserted is provided in the center thereof. Although the material of the bearing 110 is not limited, it is preferably formed of a metal such as low carbon steel, medium carbon steel, chrome steel, stainless steel, brass, and bronze in order to suppress wear due to friction with the rotating shaft. Further, the material of the bearing 110 may be subjected to surface treatment such as heat treatment or chemical conversion treatment.

The power transmission unit 120 has a main body portion 122 which is an annular member having a diameter larger than that of the bearing 110, and a plurality of teeth 124 which are arranged so as to project from the outer periphery of the main body portion 122. The inner diameter of the power transmission unit 120 (inner diameter of the main body 122) is larger than the outer diameter of the bearing 110, and the bearing 110 can be arranged inside the inner circumference of the power transmission unit 120 (inside the inner circumference of the main body 122). Has been done. The power transmission unit 120 is made of a metal such as low carbon steel, medium carbon steel, chrome steel, stainless steel, brass, and bronze in order to suppress wear due to contact with the teeth of other gears.

The connecting portion 130 is an annular member arranged between the bearing 110 and the power transmitting portion 120 and connecting them, and fills the space between the bearing 110 and the power transmitting portion 120. The inner circumference of the connecting portion 130 substantially coincides with the outer circumference of the bearing 110, the outer circumference substantially coincides with the inner circumference of the power transmission unit 120, and these are connected, and the bearing 110 and the power transmission unit 120 are rotated in synchronization with each other. ..

The connection portion 130 is made of a metal different from both the bearing 110 and the power transmission portion 120. Examples of materials for the connection 130 include aluminum, magnesium, copper and iron. The material of the connection portion 130 is softer than the material of the power transmission portion 120 from the viewpoint of facilitating the production by the plastic flow described later and also exerting the vibration and sound damping effect of the material of the connection portion 130. It is preferable that the material is softer than the material of the bearing 110. In particular, when a low-density material such as aluminum is used, the weight of the gear 100 can be reduced, the tapping sound of teeth when meshing with adjacent gears can be reduced, and the frictional force can be reduced.

The bearing 110, the power transmission unit 120, and the connection unit 130 have an annular shape centered on the same rotation shaft O, and rotate coaxially around the rotation shaft O.

FIG. 2 is a cross-sectional view cut along a plane parallel to the radial direction of the gear 100 along the region AA of the alternate long and short dash line shown in FIG. FIG. 3 is a cross-sectional view cut along a plane parallel to the axial direction of the gear 100 along the region BB of the alternate long and short dash line shown in FIG.

In the gear 100, the (hole 112), the bearing 110, the connection portion 130, and the power transmission portion 120 are continuously arranged in this order along the radial direction from the rotation shaft O. The bearing 110 and the connecting portion 130 are in contact with each other, and the connecting portion 130 and the power transmitting portion 120 are in contact with each other.

The first interface 140, which is the interface between the bearing 110 and the connecting portion 130, is a surface formed continuously in the circumferential direction between the bearing 110 and the connecting portion 130. The first interface 140 is provided with a retaining portion 142 (circumferential groove) in which one of the bearing 110 or the connecting portion 130 enters the other continuously in the circumferential direction (see FIG. 3).

Further, the first interface 140 is provided with a plurality of dented portions 144 (vertical grooves) in which one of the bearing 110 or the connecting portion 130 has entered the other on the inner side of the retaining portion 142 (vertical groove). (See FIGS. 2 and 3). Then, in the recessed portion 144 of the first interface 140, a void 146 that is not filled with either the material constituting the bearing 110 or the metal constituting the connecting portion 130 is partially formed.

The retaining portions 142 are provided in the vicinity of both end portions in the axial direction of the first interface 140, and the bearing 110 and the connecting portion 130 are made to bite into each other in the vicinity of the both end portions, and the bearing from the gear 100 is provided. The axial disconnection (disengagement) of the 110 or the connection portion 130 is suppressed.

A plurality of voids 146 are discontinuously provided in a part of the inside of the dent portion 144, and the inside is filled with air. In the gap 146, vibration and sound are difficult to be transmitted from the connection portion 130 to the bearing 110 or from the bearing 110 to the connection portion 130. Therefore, the gap 146 narrows the transmission path of vibration and sound inside the gear 100, and suppresses these transmissions from the gear 100 to other members.

The gap 146 may be filled with a liquid or the like as long as it can suppress vibration and sound transmission between the connection portion 130 and the bearing 110.

The second interface 150, which is the interface between the connecting portion 130 and the power transmitting portion 120, is a surface formed continuously in the circumferential direction between the connecting portion 130 and the power transmitting portion 120. The second interface 150 is provided with a retaining portion 152 (circumferential groove) in which one of the connecting portion 130 or the power transmitting portion 120 enters the other, which is continuous in the circumferential direction (see FIG. 3).

Further, the second interface 150 is provided with a plurality of dented portions 154 (vertical grooves) in which one of the connecting portion 130 or the power transmission portion 120 has entered the other on the inner side of the retaining portion 152 in the axial direction. (See FIGS. 2 and 3). Then, in the recessed portion 154 of the second interface 150, a void 156 that is not filled with either the metal constituting the connecting portion 130 or the metal constituting the power transmission portion 120 is partially formed.

The retaining portions 152 are provided in the vicinity of both ends in the axial direction of the second interface 150, and the metal forming the connecting portion 130 and the metal forming the power transmission portion 120 are mutually provided in the vicinity of both ends. It is made to bite into the gear 100 to prevent the connection portion 130 or the power transmission portion 120 from coming off (disconnecting) in the axial direction.

A plurality of voids 156 are discontinuously provided in a part of the inside of the dent portion 154, and the inside is filled with air. In the gap 156, vibration and sound are difficult to be transmitted from the power transmission unit 120 to the connection unit 130, or from the connection unit 130 to the power transmission unit 120. Therefore, the gap 156 narrows the transmission path of vibration and sound inside the gear 100, and suppresses these transmission from the gear 100 to other members.

The gap 156 may be filled with a liquid or the like as long as it can suppress vibration and sound transmission between the connection portion 130 and the bearing 110.

4 and 5 are schematic views showing a method of manufacturing the gear 100. 4A to 4C and 5A to 5B are cross-sectional views cut along a plane parallel to the axial direction of the gear 100 along the region AA of the alternate long and short dash line shown in FIG.

First, as shown in FIG. 4A, a bearing 110 and a power transmission unit 120 are prepared, and these are set in a mold so that the bearing 110 is arranged inside the power transmission unit 120. The bearing 110 and the power transmission unit 120 are arranged so as to form a coaxial ring centered on the rotating shaft O.

Further, on the outer peripheral surface of the bearing 110, an annular groove 242 is formed at a position serving as a retaining portion 142 of the gear 100, and a groove 244 in the vertical direction is formed at a position serving as a dent portion 144 of the gear 100. It is formed. Similarly, on the inner peripheral surface of the power transmission unit 120, an annular groove 252 is formed at a position serving as a retaining portion 152 of the gear 100, and in the vertical direction at a position serving as a dent portion 154 of the gear 100. Groove 254 is formed.

Next, as shown in FIG. 4B, a metal member 330 made of the same material as the connecting portion 130 is arranged between the bearing 110 and the power transmitting portion 120.

The metal member 330 is an annular member having a shape 20 that can be fitted between the bearing 110 and the power transmission unit 120. Specifically, the inner diameter of the metal member 330 is larger than the outer diameter of the bearing 110 (the outer diameter of the portion that becomes the retaining portion 142), and the outer diameter is the inner diameter of the power transmission portion 120 (the retaining portion 152). It has a shape smaller than the inner diameter of the part). Further, the thickness of the metal member 330 in the axial direction is larger than both the thickness of the bearing 110 and the thickness of the power transmission unit 120. As a result, the metal member 330 is arranged so as to be inserted into the space between the bearing 110 and the power transmission unit 120, and both ends in the axial direction are axially outside the bearing 110 and the power transmission unit 120. Will be done.

Next, as shown in FIG. 4C, the metal member 330 is pressurized from both sides in the axial direction (both sides in the insertion direction) using the mold 360.

The mold 360 has a shape in which a portion of the pressurizing surface that pressurizes the interface between the connection portion 130 and the power transmission portion 120 and a portion that pressurizes the interface between the connection portion 130 and the bearing 110 project in the pressurizing direction. Have. By using such a mold 360, it is possible to pressurize the vicinity of each of the above interfaces with a stronger stress.

The pressurized metal member 330 plastically flows to fill the space between the bearing 110 and the power transmission unit 120. As a result, the metal member 330 enters the groove 242 formed on the outer peripheral surface of the bearing 110 to form the retaining portion 142, and the metal member 330 enters the groove 252 formed on the inner peripheral surface of the power transmission portion 120 to prevent the metal member 330 from coming off. It becomes part 152.

In order to pressurize the metal member 330 from both sides in the axial direction (both sides in the insertion direction), the plastically fluidized metal member 330 fills the space between the bearing 110 and the power transmission unit 120 from both sides in the axial direction. At this time, by adjusting the magnitude of stress by the mold 360, the amount of the metal member 330 that enters the groove 244 formed on the outer peripheral surface of the bearing 110 is adjusted, and the entire groove 244 is filled with the metal member 330. By preventing this, air 346 can be left inside the groove 244. Similarly, by adjusting the magnitude of stress by the mold 360, the amount of the metal member 330 that enters the groove 254 formed on the outer peripheral surface of the power transmission unit 120 is adjusted, and the entire groove 254 is formed by the metal member 330. By preventing it from being filled, air 356 can remain inside the groove 254.

At this time, the vicinity of the interface between the connection portion 130 and the power transmission portion 120 and the vicinity of the interface between the connection portion 130 and the bearing 110 are pressurized with a stronger stress than the other portions. Therefore, the metal member 330 in these portions can be made easier to flow, and the metal member 330 can be sufficiently flowed into the groove 252. On the other hand, by appropriately adjusting the stress to be pressed at this time, the metal member 330 can be made to flow to the extent that the inside of the groove 254 is not completely filled.

In this way, as shown in FIG. 5A, the space between the bearing 110 and the power transmission unit 120 is filled with the metal member 330, and air 346 remains in the groove 244 between the bearing 110 and the metal member 330. In addition, the composite 400 is obtained in which air 356 remains in the groove 254 between the power transmission unit 120 and the metal member 330.

In the complex 400, the composition-flowing metal member 330 partially covers the outer surfaces of the bearing 110 and the power transmission unit 120. As shown in FIG. 5B, the gear 100 can be obtained by removing the metal member 330 that partially covers these outer surfaces. At this time, the remaining air 346 and air 356 become voids 146 and voids 156, respectively.

The gears described above can be suitably used for various power transmission mechanisms.

Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and can be appropriately modified and implemented without departing from the spirit of the present disclosure.

For example, in the above-described embodiment, the first interface 140, which is the interface between the bearing 110 and the connection portion 130, and the second interface 150, which is the interface between the connection portion 130 and the power transmission portion 120, are both continuous in the circumferential direction. However, the surface is not limited to this. For example, a notch or a protruding portion may be provided on the outer peripheral surface side of the bearing 110 or the inner peripheral surface side of the power transmission portion 120 so that the first interface 140 or the second interface is discontinuous in the circumferential direction.

For example, as shown in FIG. 6, a notch 126 may be provided on the inner peripheral surface side of the power transmission unit 120 so that the second interface 150 is discontinuous in the circumferential direction. In this way, the relative rotation of the power transmission unit 120 and the connection unit 130 in the circumferential direction is restricted. Therefore, the rotational force can be reliably transmitted between the power transmission unit 120 and the connection unit 130.

Further, the bearing may have a sliding bearing member (not shown) or a rolling bearing. Alternatively, the bearing 110 may be integrally configured with the rotating shaft.

Further, in the above-described embodiment, the bearing 110 and the power transmission unit 120 are separate members, but these may be integrated.

Further, in the above-described embodiment, it is assumed that the voids 146 and 156 are formed only in a part of the dents 144 and 154, but the entire dents 144 and 154 may be the voids 146 and 156.

Further, in the above-described embodiment, it is assumed that the dented portion 144 and the dented portion 154, which are grooves, are formed at both the first interface 140 and the second interface 150, respectively, but these dented portions are formed at one interface. It may be formed only on. Alternatively, these dents are not formed, the stress of pressurization by the mold 300 at the time of manufacturing is reduced, and the metal member 330 is made difficult to flow on the inner side between the bearing 110 and the power transmission portion 120. This may form a partial void.

Further, in the above-described embodiment, the gear has been described as an example of the power transmission component, but the present invention is not limited to this, and a pulley, a sprocket, or the like may be used.

According to the present disclosure, it is possible to enhance the damping effect of vibration and sound even in a power transmission component formed by combining members made of different metals. Therefore, it is expected to increase the selectability of materials that can be used for power transmission parts and contribute to the expansion of applications and efficiency improvement of power transmission parts.

100 Gear 110 Bearing 112 Hole 120 Power transmission part 122 Main body part 124 Tooth 126 Notch part 130 Connection part 140 First interface 142 Retaining part 144 Dent part 146 Void 150 Second interface 152 Retaining part 154 Dent part 156 Void 242, 244 Grooves 252, 254 Grooves 330 Metal Parts 346 Air 356 Air 360 Mold

Claims (7)

With an annular bearing,
A metal and annular power transmission unit with multiple teeth arranged in the circumferential direction on the outer peripheral surface.
It has a metal and annular connecting portion that is disposed between the bearing and the power transmitting portion and connects the bearing and the power transmitting portion.
The connection part is made of a metal different from the power transmission part, and is made of a different metal.
A gap is partially formed at the interface between the bearing and the connection portion, or at the interface between the connection portion and the power transmission portion.
Power transmission parts. The power transmission component according to claim 1, wherein the connection portion is made of a metal softer than the material of the power transmission portion. The connection portion is a dented portion in which one of the bearing and the connection portion enters the other at the interface with the bearing, or one of the power transmission portion and the connection portion at the interface with the power transmission portion. Has a dent, which has penetrated into the other,
The void is formed in a part or the whole of the dented portion.
The power transmission component according to claim 1 or 2. The connection portion is a retaining portion in which the bearing and the connection portion bite into each other at the interface with the bearing, or the power transmission portion and the connection portion bite into each other at the interface with the power transmission portion. Has a retaining part,
The power transmission component according to any one of claims 1 to 3. A step of preparing a metal and annular power transmission unit in which a plurality of teeth are arranged in the circumferential direction on the outer peripheral surface, and an annular bearing arranged so as to form a ring coaxial with the power transmission unit.
A step of inserting and arranging a metal member made of a metal different from the power transmission unit between the power transmission unit and the bearing.
The step of pressurizing the metal member from both sides in the insertion direction and
Have,
By the pressurization, a gap is partially formed at the interface between the bearing and the connection portion or the interface between the connection portion and the power transmission portion.
Manufacturing method of power transmission parts. A groove is formed on the surface of the power transmission unit or the bearing in contact with the metal member in the direction in which the metal member is inserted.
The method for manufacturing a power transmission component according to claim 5. A power transmission mechanism comprising the power transmission component according to any one of claims 1 to 4, or a power transmission component manufactured by the method for manufacturing a power transmission component according to claim 5 or 6.

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