JP2004052828A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission device capable of suppressing generation of fatigue destruction. <P>SOLUTION: A stellate reinforcing rib 217 curved in such a way as protruding in the axial direction of a coupling cylinder 211 is provided in the neighborhood of each rivet 214 where stresses are likely to concentrate. This enables enhancing the stiffness of the part surrounding the rivet 214 without causing a coupling 210 to be constructed large and heavy, and the coupling 210 can be prevented from a fatigue destruction in the part surrounding the rivet 214. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a power transmission device for transmitting torque of a driving device such as an engine or an electric motor to driven devices such as a pump or a compressor, and a power transmission for transmitting power of an engine to a compressor of a vehicle air conditioner. It is effective when applied to equipment.
[0002]
Problems to be solved by the prior art and the invention
As a power transmission device, the inventors studied a prototype shown in FIG.
[0003]
However, since the drive shaft is connected to the connection flange portion 213 and the own weight of the drive shaft is received by the coupling 210, the coupling 210 is likely to be slightly distorted.
[0004]
When the coupling flange 213 and the coupling 210 rotate at high speed while the coupling 210 is distorted, stress due to eccentric load tends to concentrate around the rivet 214 connecting the coupling flange 213 and the coupling 210. There is a high possibility that the coupling 210 will be fatigued and broken around the rivet 214.
[0005]
In view of the above points, the present invention firstly provides a novel power transmission device different from the conventional one, and secondly, aims to suppress occurrence of fatigue failure in the power transmission device.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, the cylindrical portion (211) and the cylindrical portion (211) are configured to close one axial end of the cylindrical portion (211). ) And a first rotating body (210) having a flange (212) connected to the flange (212) via a plurality of fastening means (214) formed in a rod shape. (210) and a second rotating body (213) that rotates integrally, and protrudes in the axial direction of the cylindrical portion (211) in the vicinity of the fastening means (214) in the flange portion (212). A curved reinforcing rib (217) is provided.
[0007]
Thus, the rigidity around the fastening means (214) can be increased without increasing the size and weight of the power transmission device. As a result, it is possible to prevent the power transmission device from being fatigue-ruptured around the fastening means (214).
[0008]
According to the second aspect of the present invention, the fastening means (214) is circumferentially arranged around the rotation center axis, and the reinforcing rib (217) surrounds the plurality of fastening means (214). It is characterized in that it is formed in a star shape with the center of rotation being the centroid.
[0009]
Thus, as in the third aspect, the reinforcing rib (217) has a portion (217a) extending in a direction inclined with respect to a reference line (Lo) extending radially from the rotation center and the reference line (Lo). ) Extending in the direction substantially perpendicular to the reference line (Lo) and the direction substantially perpendicular to the reference line (Lo). Thus, the power transmission device can be reliably prevented from being fatigued and broken around the fastening means (214).
[0010]
According to the third aspect of the present invention, the reinforcing rib (217) has a portion (217a) extending in a direction inclined with respect to a reference line (Lo) extending radially from the center of rotation, and a portion substantially extending with respect to the reference line (Lo). And a portion (217b) extending in a direction perpendicular to the direction.
[0011]
Thereby, the rigidity can be increased in both the direction of the reference line (Lo) and the direction substantially perpendicular to the reference line (Lo), so that the power transmission device is broken down around the fastening means (214). Can be reliably prevented.
[0012]
According to the invention described in claim 4, the reinforcing ribs (217) are provided in a plurality of rows around the rotation center so as to surround the plurality of fastening means (214). The reference numerals in parentheses of the means are examples showing the correspondence with specific means described in the embodiments described later.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
In this embodiment, a power transmission device 200 according to the present invention is applied to a stationary air conditioner, and FIG. 1 is a schematic diagram of the air conditioner.
[0014]
In FIG. 1, a compressor 100 is a driven device that receives power from an internal combustion engine 300 that is a driving device via a power transmission device 200 to suck and compress refrigerant, and a radiator 110 is discharged from the compressor 100. This is a high-pressure side heat exchanger that cools the refrigerant. The decompressor 120 is a decompression means for decompressing the high-pressure refrigerant flowing out of the radiator 110, and the evaporator 130 is a low-pressure heat exchanger that exhibits a refrigerating ability by evaporating the refrigerant decompressed by the decompressor 120. is there.
[0015]
In the present embodiment, a fixed throttle having a fixed opening such as an orifice or a capillary tube is employed as the decompressor 120. Further, the control of the refrigerating capacity (circulating refrigerant flow rate) is performed by controlling the rotation speed of the internal combustion engine 300.
[0016]
Next, the power transmission device 200 will be described.
[0017]
FIG. 2 is a view showing a power transmission device 200 according to the present embodiment, FIG. 3 is a view taken in the direction of arrow A in FIG. 2, FIG. 4 is a cross-sectional view of a coupling 210 described later, and FIG. FIG. 210 is a front view of FIG.
[0018]
The coupling 210 is a first rotating body that rotates by receiving a driving force from the internal combustion engine 300 via a driving shaft 301 (see FIG. 1). As shown in FIG. 2, the coupling 210 has a substantially cylindrical coupling tube portion 211 and a coupling tube portion so as to close one axial end (left side in FIG. 2) of the coupling tube portion 211. It has a coupling cup portion 212 integrally formed with and connected to a portion 211 and is formed in a substantially cup shape.
[0019]
Further, in the present embodiment, the coupling cylinder 211 and the coupling flange 212 are integrally formed from a single plate by press working, and the drive shaft 301 is connected to the coupling flange 212. Then, a connection flange 213 forming a second rotating body for transmitting the power of the drive shaft 301 to the coupling 210 is fixed by a rivet 214 forming a rod-shaped fastening means.
[0020]
These rivets 214 are arranged circumferentially around the rotation center axis as shown in FIGS. 3 and 5, and near the rivet 214, as shown in FIG. The reinforcing rib 217 curved so as to protrude in the axial direction is formed integrally with the coupling flange 212 by press molding.
[0021]
Further, as shown in FIGS. 3 and 5, a plurality of examples of the reinforcing ribs 217 are formed in a star shape (gear shape) having a center of rotation as a centroid so as to surround the plurality of rivets 214. Note that the centroid is, as is well known, a point where the area moments are balanced in a plane figure.
[0022]
On the outer edge side of the connection flange 213, a cylindrical connection flange tube portion 218 protruding in the rotation axis direction of the connection flange 213 is integrally formed when the connection flange 213 is formed. The connecting flange 213 is manufactured by cutting a predetermined portion after die casting.
[0023]
The first rotor 220 is arranged coaxially with the coupling 210 on the inner peripheral side of the coupling 210 and rotates. The first rotor 220 has a cylindrical shape arranged coaxially with the coupling cylinder 211. An outer plate comprising a rotor cylinder portion 221 and a rotor flange portion 222 connected to the rotor cylinder portion 221 so as to close an end on the same side as the coupling flange portion 212 among axial end portions of the rotor cylinder portion 221. 223 and a center hub 225 fixed to the rotor flange 222 with pins 224.
[0024]
The center hub 225 is inserted into the shaft in a state where the center hub 225 is prevented from rotating by a spline formed on the outer peripheral surface of the shaft 101 of the compressor 100, and is prevented from dropping off the shaft by a bolt. I have.
[0025]
The second rotor 230 is connected to the coupling cylinder 211 with a bolt 231 so as to close the other axial end (right side in the drawing) of the coupling cylinder 211. Can rotate coaxially with the first rotor 220 and the coupling 210 via a rolling radial bearing 232 mounted (press-fitted) on the outer peripheral side of the cylindrical portion of the compressor 100 provided in the front housing 102 of the compressor 100. It is supported by.
[0026]
An inner plate 240 that rotates integrally with the second rotor 230 is fixed to the second rotor 230 by pins or by welding. The inner plate 240 projects from the second rotor 230 toward the rotor flange 222. And is located on the inner peripheral side of the rotor cylinder portion 221.
[0027]
The outer peripheral surface (rotor cylinder portion 221) of the outer plate 223 is formed into a wavy irregular shape having a plurality of irregularities, and the outer peripheral surface of the inner plate 240 is It is formed into a wavy irregular shape having irregularities.
[0028]
Between the two plates 223 and 240, the inner peripheral surface of the outer plate 223 and the outer peripheral surface of the inner plate 240 come into contact with each other and are elastically deformable, such as rubber, which mechanically engages with the two plates 223 and 240 at the uneven portions. A damper 250 made of an elastic material (in the present embodiment, chlorinated butyl rubber) is provided, and the torque transmitted to the third rotor 230 is transmitted to the first rotor 220 via the damper 250.
[0029]
Further, a cutout (not shown) for reducing the rigidity of the outer plate 223 is provided in a portion of the outer plate 223 where the damper 250 is mounted, so that the rigidity is reduced as compared with other portions. A low rigidity portion is provided.
[0030]
When the torque acting on the first rotor 220 becomes equal to or more than a predetermined value, the low-rigidity portion is deformed so that the diameter of the rotor cylinder portion 221 (outer plate 223) increases, and the engagement state of the damper 250 is increased. Is released.
[0031]
That is, in the present embodiment, the torque fluctuation transmitted from the inner plate 240 to the outer plate 223 by the damper 250 is absorbed, and the torque of a predetermined value or more is transmitted by using the deformation of the outer plate 223 and the damper 250. And a torque limiter mechanism for preventing the above.
[0032]
On the other end of the coupling cylinder 211 in the axial direction (on the second rotor 230 side), a connection flange 215 for coupling the second rotor 230 extends radially outward from the coupling cylinder 211. When the rotor cylinder 221 (outer plate 223) is deformed so as to increase in diameter, the tip of the rotor cylinder 221 is attached to the coupling cylinder 211 when the rotor cylinder 221 (outer plate 223) is deformed so as to be extended. A relief space 260 for preventing interference is provided.
[0033]
When the coupling 210 is formed by press working at the joint (the connection flange 215) between the coupling cylinder 211 and the second rotor 230, the relief space 260 is formed between the connection flange 215 and the coupling cylinder. This is based on the fact that a connecting portion (bent R portion) 216 connecting the second portion 211 is formed in an arc shape.
[0034]
Specifically, by forming the connecting portion 216 into an arc shape, a gap formed between the connecting portion 216 and the second rotor 230 is shifted toward the coupling flange portion 212 to form a relief space 260. Things.
[0035]
Next, a schematic operation of the power transmission device 200 according to the present embodiment will be described.
[0036]
The torque transmitted to the coupling 210 is transmitted to the first rotor 220 via the second rotor 230, the inner plate 240, and the damper 250, and transmitted from the center hub 225 to the shaft 101 of the compressor 100.
[0037]
At this time, the torque fluctuation is absorbed by the damper 250, and when the transmission torque becomes equal to or more than the predetermined value, the diameter of the rotor cylinder portion 221 is deformed so as to be enlarged and the engagement state of the damper 250 is released. Torque transmission is interrupted.
[0038]
Next, the operation and effect of the present embodiment will be described.
[0039]
In the present embodiment, the reinforcing ribs 217 that are curved so as to protrude in the axial direction of the coupling cylinder 211 are provided in the vicinity of the rivet 214, so that the rivet can be obtained without increasing the size and weight of the coupling 210. The rigidity around 214 can be increased. Consequently, it is possible to prevent the coupling 210 from being fatigued and broken around the rivet 214.
[0040]
Further, since the reinforcing ribs 217 are formed in a plurality of examples in a star shape with the center of rotation being the center of gravity so as to surround the plurality of rivets 214, the reinforcing ribs 217 are provided with the center of rotation as shown in FIGS. And a portion 217b extending in a direction inclined with respect to a reference line Lo extending radially from the portion 217b, and a portion 217b extending in a direction substantially perpendicular to the reference line Lo.
[0041]
Therefore, the rigidity can be increased both in the direction of the reference line Lo and in the direction substantially perpendicular to the reference line Lo, so that it is possible to reliably prevent the coupling 210 from being fatigue-ruptured around the rivet 214.
[0042]
Further, on the outer edge side of the connection flange 213, a cylindrical connection flange tube portion 218 protruding in the rotation axis direction of the connection flange 213 is integrally formed with the connection flange 213, so that the vicinity of the rivet 214 on the connection flange 213 side is formed. The rigidity of the portion can be increased, and the connection flange 213 can be prevented from being fatigue-ruptured around the rivet 214.
[0043]
(Other embodiments)
In the above embodiment, the power transmission device according to the present invention is applied to a stationary air conditioner, but the present invention is not limited to this, and may be applied to other air conditioners for vehicles and the like. Can be.
[0044]
In the above-described embodiment, the damper 250 is made of rubber (chlorinated butyl rubber). However, the present invention is not limited to this, and may be made of other materials such as resin and metal.
[0045]
Further, in the above-described embodiment, the coupling is a type in which torque is transmitted from the coupling 210 to the first rotor 220 via the second rotor 230, but the present invention is not limited to this. Conversely, the present invention may be applied to a type of joint in which torque is transmitted from the first rotor 220 to the coupling 210 via the second rotor 230.
[0046]
Further, in the above-described embodiment, the reinforcing rib 217 is curved so as to protrude to the left side in FIG. 2. On the contrary, the reinforcing rib 217 is configured to curve so as to protrude to the right side in the drawing. May be.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of an air conditioner according to an embodiment of the present invention.
FIG. 2 is a diagram showing a power transmission device according to an embodiment of the present invention.
FIG. 3 is a view taken in the direction of arrow A in FIG. 2;
FIG. 4 is a cross-sectional view of the coupling according to the embodiment of the present invention.
FIG. 5 is a front view of the coupling according to the embodiment of the present invention.
FIG. 6 is a diagram showing a power transmission device according to a prototype product.
[Explanation of symbols]
210: coupling, 211: coupling cylinder,
212: coupling flange portion, 214: rivet,
213: connecting flange portion, 220: first rotor,
221, a rotor cylinder portion; 222, a rotor flange portion;
223: outer plate, 230: second rotor,
240: inner plate, 250: damper.

Claims (4)

A first rotating body (210) having a tubular portion (211) and a flange portion (212) connected to the tubular portion (211) so as to close one axial end of the tubular portion (211); When,
A second rotating body (213), which is fixed to the flange portion (212) via a plurality of rod-shaped fastening means (214) and rotates integrally with the first rotating body (210). ,
A reinforcing rib (217) curved so as to protrude in the axial direction of the tubular portion (211) is provided near the fastening means (214) in the flange portion (212). Power transmission device. The fastening means (214) is arranged circumferentially around a rotation center axis,
The power transmission according to claim 1, wherein the reinforcing ribs (217) are formed in a star shape around a center of rotation so as to surround the plurality of fastening means (214). apparatus. The reinforcing rib (217) has a portion (217a) extending in a direction inclined with respect to a reference line (Lo) extending radially from the center of rotation, and a portion (217) extending in a direction substantially perpendicular to the reference line (Lo). 217b). The power transmission device according to claim 1, wherein the power transmission device includes: The power according to any one of claims 1 to 3, wherein the reinforcing ribs (217) are provided in a plurality of rows around a rotation center so as to surround the plurality of fastening means (214). Transmission device.

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