JP3969203B2 - Power transmission device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power transmission device that transmits torque of a driving device such as an engine or an electric motor to a driven device such as a pump or a compressor, and transmits power of the engine to a compressor of a vehicle air conditioner. It is effective when applied to a device.
[0002]
[Prior art and problems to be solved by the invention]
In a continuously variable capacity compressor for a vehicle air conditioner, the number of cylinders has been decreasing in recent years, and in response to this, the torque fluctuation of the compressor itself has become relatively large. For this reason, there is an increasing need to take measures against noise associated with vibrations of a compressor or the like caused by torque fluctuations.
[0003]
On the other hand, the inventors have studied a power transmission device that absorbs torque fluctuations by incorporating an elastically deformable damper such as rubber into the power transmission device. There was a need to absorb fluctuations.
[0004]
If the elastic coefficient of the damper is sufficiently small, it is possible to sufficiently absorb the torque fluctuation. However, if the elastic coefficient of the damper is sufficiently small, the damper is greatly deformed when the damper absorbs the torque fluctuation. Therefore, it is difficult to ensure the durability and reliability of the damper.
[0005]
In view of the above points, an object of the present invention is to sufficiently absorb torque fluctuations with a different conventional new configuration.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a power transmission device for transmitting torque of a driving device to a driven device according to the first aspect of the present invention, wherein the first rotating body is rotated by the driving device ( 2), a second rotating body (5) connected to the driven device side and arranged coaxially with the first rotating body (110) and rotating, and the first rotating body (2) and the second rotating body (5) Between the first rotating body (2) and the second rotating body (5) and an elastically deformable torque transmitting member (6) disposed between the first rotating body (2) and the second rotating body ( 5) having a substantially plate-like plate (7) fixed to one end in the axial direction and rotating integrally with the second rotating body (5), and radially inward of the first rotating body (2). is the inner circumferential surface (2c) is formed in contact with the torque transmission member (6), the weight portion on the outer peripheral side (7a) set of plates (7) It is and, weight portions (7a) is characterized by being located radially outwardly of the inner circumferential surface (2c).
[0007]
As a result, the moment of inertia of the entire plate (7) including the weight portion (7a) is increased, and the entire plate (7) including the weight portion (7a) functions as a flywheel that absorbs torque fluctuations. Therefore, torque fluctuations can be sufficiently absorbed by a different conventional new configuration.
[0008]
In addition, since the plate (7) is positioned on one end side in the axial direction of the first and second rotating bodies (2, 5), one end side in the axial direction of the first and second rotating bodies (2, 5) is the plate ( 7). Therefore, since the plate (7) functions as a cover for protecting the first and second rotating bodies (2, 5), the first and second rotating bodies (2, 5) can be protected from, for example, water.
[0009]
In assembling the power transmission device according to the present invention, after assembling the first and second rotating bodies (2, 5), the torque transmitting member (6) is mounted, and then the plate (7) is rotated in the first rotation. Since assembly is completed by assembling to the body (2) or the second rotating body, components such as the torque transmission member (6) can be assembled easily and quickly, and the number of assembly steps can be reduced.
[0010]
In the invention according to claim 2, the first rotating body (2) is provided with an annular groove (2 e) disposed radially outside the inner peripheral surface (2 c) and recessed in the axial direction. Furthermore, the weight portion (7a) is characterized by protruding in the axial direction so as to be fitted into the groove portion (2e).
[0011]
As a result, the moment of inertia can be increased while preventing the axial dimension from increasing.
[0012]
In the invention according to claim 3, the plate (7) is disposed radially inward of the inner peripheral surface (2 c ), contacts the torque transmission member (6), and the torque transmission member (6) is the shaft. A pressing portion (7b) that restricts displacement in the direction is provided.
[0013]
Thereby, for example, the trouble that the torque transmission member (6) falls off or is displaced can be easily and easily prevented.
[0014]
In addition, in invention of Claim 4, a plate (7) and a weight part (7a) are integrally formed with the metal, It is characterized by the above-mentioned.
[0015]
Incidentally, the reference numerals in parentheses of each means described above are an example showing the correspondence with the specific means described in the embodiments described later.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
In the present embodiment, the power transmission device according to the present invention is applied to a joint that transmits the power of an engine (drive source) to a compressor of a vehicle air conditioner. FIG. 1 illustrates power transmission according to the present embodiment. 2 is a cross-sectional view of the device 1, and FIG. 2 is a left side view (partial cross-sectional view) of FIG.
[0017]
In FIG. 1, a pulley 2 is a metal or hard resin (this embodiment) formed in a substantially cylindrical shape that rotates by receiving a driving force from a traveling engine (not shown) via a V-belt (not shown). Is a first rotating body made of phenol, and a cylindrical pulley hub 2a to which a radial rolling bearing 3 for rotatably supporting the pulley 2 is mounted is integrally formed on the inner peripheral side of the pulley 2. Incidentally, the inner ring of the radial rolling bearing 3 is press-fitted to the front housing 101 of the compressor 100.
[0018]
In the present embodiment, a pulley corresponding to a polydrive belt provided with a plurality of rows of V-grooves 2b is adopted as the pulley 2, and the pulley 2 is made of resin. On the inner peripheral side where the bearing 3 is mounted, a metal sleeve 4 is integrated with the pulley hub 2a by insert molding.
[0019]
The center hub 5 is a metal second rotating body that is positioned on the inner peripheral side of the pulley 2 and is arranged coaxially with the pulley 2 and rotates. As shown in FIG. It is formed in a star shape or a gear shape so as to have uneven portions.
[0020]
Here, the center hub 5 is an outer peripheral portion that meshes with the pulley 2 via a cylindrical cylindrical portion 5 a that is splined to the shaft 102 of the compressor 100 that is a driven device, and a damper 6 that is disposed on the outer peripheral side of the center hub 5. 5b, and the outer peripheral portion 5b and the cylindrical portion 5a are mechanically connected to transmit torque from the outer peripheral portion 5b to the cylindrical portion 5a, and the torque transmitted from the outer peripheral portion 5b to the cylindrical portion 5a is equal to or greater than a predetermined torque. It is composed of a plurality of (three in the present embodiment) bridge portions 5c set to such a strength that they will break.
[0021]
In the present embodiment, to form a center hub 5 are integrally molded cylindrical portion 5a, the outer circumferential portion 5b, and the bridge portion 5c of the metal powder by sintering to Turkey.
[0022]
By the way, the star-shaped outer peripheral surface 5d of the center hub 5 (hereinafter referred to as the hub outer peripheral surface 5d) and the inner peripheral surface 2c of the pulley 2 (hereinafter referred to as the pulley inner peripheral surface 2c) are radial. A plurality of pulley inner peripheral surfaces 2c that are lined up in a direction orthogonal to the axis and are opposed to each other, and that are curved so as to be recessed toward the opposite side of the hub outer peripheral surface 5d, that is, in the outer radial direction. The concave surface portion 2d is formed around the rotation axis and has a wavy shape. On the other hand, the hub outer peripheral surface 5d has a plurality of curved surfaces so as to sink toward the opposite side of the pulley inner peripheral surface 2c, that is, toward the center side. A single concave surface portion 5e is formed around the rotation axis and has a star shape.
[0023]
A space between the recesses 2d and 5e facing each other (hereinafter, this space is referred to as a damper housing portion 6a) is brought into contact with the pulley inner peripheral surface 2c and the hub outer peripheral surface 5d to move from the pulley 2 to the center hub 5. A damper 6 made of an elastically deformable elastic material that transmits torque (EPDM (ethylene / propylene / diene terpolymer rubber) in this embodiment) is disposed, and this damper 6 is within the scope of the claims. It corresponds to the described torque transmission member.
[0024]
Incidentally, the damper 6 has a columnar shape with an elliptical cross-sectional shape, and is disposed in the damper storage portion 6a so that the axial direction of the damper 6 and the rotational axis direction are parallel to each other.
[0025]
As shown in FIG. 1, a disc-shaped plate 7 is fixed to the outer peripheral portion 5 b of the center hub 5 with bolts 8, and a ring-shaped weight portion 7 a is provided on the outer peripheral side of the plate 7. Is provided. The plate 7 and the weight portion 7a are molded from a relatively high density material such as iron-based metal.
[0026]
At this time, the weight part 7a protrudes in the axial direction so as to be fitted into the groove part 2e formed in the pulley 2. The groove portion 2e is a concave portion that is recessed in the axial direction of the pulley 2 and formed in an annular shape.
[0027]
On the damper 6 side of the plate 7, there is provided a pressing portion 7 b that protrudes toward the damper 6 side and restricts the damper 6 from being displaced to one end side (left side of the paper surface) in the rotation axis direction by a predetermined dimension or more. The pressing portion 7b is formed in an annular shape over the entire circumference.
[0028]
Next, a schematic operation of the power transmission device 1 according to this embodiment will be described.
[0029]
When torque acts on the pulley 2, the pulley 2 and the center hub 5 are relatively displaced and the volume of the damper storage portion 6 a is reduced, so that the damper 6 stored in the damper storage portion 6 a is compressed. Shears while deforming.
[0030]
At this time, torque is transmitted from the pulley 2 to the center hub 5 by deformation of the damper 6, that is, the compression force and shear deformation resulting from deformation of the rotational direction component, and the damper 6 is deformed. Torque fluctuations are absorbed and it functions as a so-called Knighthard type joint.
[0031]
On the other hand, when the torque transmitted from the pulley 2 to the center hub 5 exceeds a predetermined value, the bridge portion 5c is broken, and the torque transmission from the pulley 2 to the center hub 5 is interrupted. That is, the bridge portion 5c functions as a torque limiter mechanism that prevents the transmission of torque greater than a predetermined value.
[0032]
Next, the effect of this embodiment is described.
[0033]
In the present embodiment, since the weight portion 7a is provided on the outer peripheral side of the plate 7, the inertia moment of the entire plate 7 including the weight portion 7a increases, and the entire plate 7 including the weight portion 7a exhibits torque fluctuation. Acts as a flywheel to absorb. Therefore, the torque fluctuation can be sufficiently absorbed.
[0034]
3A is a test result showing the torque fluctuation of the power transmission device 1 according to this embodiment, and FIG. 3B is a test result showing the torque fluctuation of the power transmission device without the weight portion 7a. As is apparent from the test results, it can be understood that the torque fluctuation can be sufficiently absorbed.
[0035]
Further, since the plate 7 is positioned on one end side in the axial direction of the pulley 2 and the center hub 5, one end side in the axial direction of the pulley 2 and the center hub 5 is covered with the plate 7. Therefore, since the plate 7 functions as a cover that protects the pulley 2 (particularly, the radial rolling bearing 3) and the center hub 5, the pulley 2 and the center hub 5 can be protected from, for example, water.
[0036]
Further, since the weight portion 7a protrudes in the axial direction so as to fit into the groove portion 2e formed in the pulley 2, the moment of inertia can be increased while preventing an increase in the axial dimension.
[0037]
In addition, since the damper 6 is pressed by the pressing portion 7b, it is possible to easily and simply prevent a problem that the damper 6 falls off, for example.
[0038]
In assembling the power transmission device 1 according to the present embodiment, the pulley 2 and the center hub 5 are assembled to the compressor 100, and then the damper 6 is inserted into the damper accommodating portion 6a. Assembling is completed by assembling, the parts such as the damper 6 can be assembled easily and quickly, and the number of assembling steps can be reduced.
[0039]
(Other embodiments)
In the above-described embodiment, the plate 7 is assembled to the center hub 5, but may be assembled to the pulley 2.
[0040]
In the above-described embodiment, the plate 7 is assembled to the outer peripheral portion 5 b of the center hub 5, but the plate 7 may be assembled to the cylindrical portion 5 a of the center hub 5. If the plate 7 is assembled to the cylindrical portion 5a of the center hub 5, it is possible to suppress unnecessary inertial force from acting on the torque limiter mechanism.
[0041]
The specific material of the damper 6 is not limited to the rubber (EPDM) described above, and may be made of other elastic resin materials such as an elastomer.
[0042]
In the above-described embodiment, the torque transmission device according to the present invention is applied to a vehicle air conditioner. However, the present invention is not limited to this, and can be widely applied to torque transmission devices in various technical fields. it can.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a power transmission device (joint) according to an embodiment of the present invention.
FIG. 2 is a left side view of FIG.
3A is a graph showing torque fluctuations of the power transmission device according to the embodiment of the present invention, and FIG. 3B is a graph showing torque fluctuations of the power transmission device having no weight portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Power transmission device, 2 ... Pulley, 5 ... Center hub, 6 ... Damper,
7: Plate, 7a: Weight part.

Claims (4)

A power transmission device that transmits torque of a driving device to a driven device,
A first rotating body (2) that is rotationally driven by the driving device;
A second rotating body (5) connected to the driven device side and arranged coaxially with the first rotating body (110) and rotating;
It is arranged so as to be sandwiched between the first rotating body (2) and the second rotating body (5), and transmits torque from the first rotating body (2) to the second rotating body (5). An elastically deformable torque transmitting member (6),
A substantially plate-like plate (7) fixed to one axial end of the second rotating body (5) and rotating integrally with the second rotating body (5);
An inner peripheral surface (2c) that contacts the torque transmission member (6) is formed on the radially inner side of the first rotating body (2),
A weight (7a) is provided on the outer peripheral side of the plate (7) ,
The power transmission device, wherein the weight portion (7a) is disposed radially outside the inner peripheral surface (2c) . The first rotating body (2) is provided with an annular groove (2e) which is disposed radially outside the inner peripheral surface (2c) and is depressed in the axial direction.
Furthermore, the said weight part (7a) protrudes in the axial direction so that it may fit in the said groove part (2e), The power transmission device of Claim 1 characterized by the above-mentioned. The plate (7) is disposed radially inward of the inner peripheral surface (2c ), and the torque transmission member (6) is displaced in the axial direction in contact with the torque transmission member (6). The power transmission device according to claim 1 or 2, further comprising a pressing portion (7b) for regulating the pressure.   The power transmission device according to any one of claims 1 to 3, wherein the plate (7) and the weight portion (7a) are integrally formed of metal.

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