JP4196682B2 - Torque transmission device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a torque transmission device that transmits torque generated by a drive source to a driven machine, and is effective when applied to a torque transmission device that transmits power from a traveling engine to a compressor of a vehicle air conditioner. .
[0002]
[Prior art]
Conventionally, in a torque transmission device that transmits power from a traveling engine to a compressor of a vehicle air conditioner, a rubber damper is disposed in the middle of a torque transmission path from a driving rotating body to a driven rotating body, and the damper itself Torque transmission is interrupted when the transmission torque becomes a predetermined value or more while absorbing torque fluctuations using the elastic deformation (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
JP-A-10-299855 [0004]
[Problems to be solved by the invention]
Incidentally, in the invention described in Patent Document 1, the contact surface of the driven-side rotating member and the damper and is in direct contact to have holder bumpers side, cracking or wear or deformation by a force acting on the contact surface during the transmission of torque May occur.
[0005]
Therefore, the inventors prototyped a torque transmission device in which the contact surface of the damper is coated with a protective film excellent in mechanical strength such as tensile strength and wear resistance and the driven-side rotating body and the damper are contacted indirectly. The new problem described below occurred.
[0006]
That is, since the protective film has anisotropy in terms of mechanical strength and wear resistance, the protective film may crack or wear depending on the direction of the force acting on the contact surface during torque transmission. As a result, the contact surface of the damper comes into direct contact with the driven-side rotating body, and the damper is cracked or worn and deformed.
[0007]
Note that if the damper is cracked or worn and deformed, a malfunction of the torque limiter may occur such that transmission of torque is interrupted with a transmission torque less than a predetermined value.
[0008]
For the above problem, measures such as increasing the film thickness of the protective film can be considered, but changing the film thickness newly generates mold costs (capital investment) associated with the change of the manufacturing mold, and protection. The material cost of the film increases.
[0009]
In view of the above points, the present invention firstly provides a novel power transmission device different from the conventional one, and secondly, the damper is cracked or worn and deformed by the force acting on the contact surface of the damper during torque transmission. It aims at suppressing that it will do.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a torque transmission device for transmitting torque generated by a drive source to a driven machine, wherein the drive rotates by receiving torque from the drive source. The side rotating body (2, 4), the driven side rotating body (6, 8) that rotates integrally with the rotating shaft on the driven machine side, and the contact surface (9b) that contacts the driven side rotating body (6, 8). And a damper (9) made of an elastic material that transmits torque from the driving side rotating body (2, 4) to the driven side rotating body (6, 8). The damper (9) is formed in an annular shape. On the outer peripheral side, there are provided four engaging portions that bulge radially outward to form a contact surface (9b), and the four engaging portions are even in the circumferential direction of the damper (9). The contact surface (9b) is arranged at intervals, and the contact surface (9b) has one anisotropy whose mechanical strength differs depending on the direction. The protective film (10) is covered, and the protective film (10) has any one of the center lines connecting the centers of the engaging portions facing each other in the direction in which the mechanical strength is maximum. By covering the damper with the damper (9), the direction in which the mechanical strength is maximized in the portion of the contact surface (9b) where the stress is concentrated at the time of torque transmission is protected as the torque is transmitted. It is characterized by being covered so as to be 45 ° ± 20 ° with respect to the direction of the force acting on the membrane (10).
[0011]
Thereby, it can prevent that the direction where the mechanical strength of a protective film (10) is low, and the direction of the force which acts on a protective film (10) with transmission of a torque correspond.
[0012]
Accordingly, the contact surface (9b) of the damper (9) is directly out of the drive side rotator (2, 4) and the driven side rotator (6, 8) due to a crack occurring in the protective film (10). Since it can be prevented from coming into contact with at least one of them, the damper (9) can be prevented from cracking and the damper (9) being worn and deformed, and the torque limiter function can be prevented from malfunctioning. it can.
[0013]
According to a second aspect of the present invention, there is provided a torque transmission device for transmitting torque generated by a drive source to a driven machine, the drive side rotating body (2, 4) rotating by receiving torque from the drive source, and the driven machine. A driven-side rotator (6, 8) that rotates integrally with the rotating shaft on the side, and a contact surface (9b) that contacts the driven-side rotator (6, 8). And a damper (9) made of an elastic material that transmits torque to the driven-side rotating body (6, 8). The damper (9) is formed in an annular shape, and radially outward on the outer peripheral side thereof. Four engaging portions that bulge to form a contact surface (9b) are provided, and the four engaging portions are arranged at equal intervals in the circumferential direction of the damper (9), and the contact surface (9b) Is coated with a single protective film (10) having anisotropy with different wear strength depending on the direction, The protective film (10) is covered with the damper (9) so that the direction in which the wear strength is maximum is along one of the center lines connecting the centers of the opposing engaging portions. Therefore, the direction in which the wear strength at the portion of the contact surface (9b) where the stress is concentrated at the time of torque transmission is 45 ° with respect to the direction of the force acting on the protective film (10) as the torque is transmitted. It is covered so that it may become +/- 20 degree.
[0014]
Thereby, it can prevent that the direction where the abrasion strength of a protective film (10) is low, and the direction of the force which acts on a protective film (10) with torque transmission correspond.
[0015]
Therefore, the protective film (10) is worn and the contact surface (9b) of the damper (9) directly contacts at least one of the driving side rotating body (2, 4) and the driven side rotating body (6, 8). Therefore, it is possible to prevent the damper (9) from being worn and deformed, and to prevent the torque limiter function from malfunctioning.
[0016]
In the invention described in claim 3, the protective film (10) is made of PTFE, and the damper (9) is made of rubber.
In the invention according to claim 4, of the engaging portions, a concave portion that is recessed in the radially inward direction of the damper (9) is provided in the circumferential central portion of the damper (9), and the center line is It is a line that connects the most radially inward sides of the recesses facing each other .
[0017]
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.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
This embodiment is applied to a torque transmission device that transmits power from a traveling engine to a compressor of a vehicle air conditioner. FIG. 1 is a torque transmission device (hereinafter referred to as a pulley) according to this embodiment. ) 1 is a half sectional view showing a state where 1 is mounted on a compressor 100 as a driven machine, and FIG. 2 is a left side view of FIG.
[0019]
The pulley portion 2 receives torque transmitted from an engine that forms a drive source via a V-belt. The pulley portion 2 is fixed to the front housing 101 of the compressor 100 via a bearing 3 so as to be rotatable. . In the present embodiment, the pulley portion 2 is formed by plastic processing such as spinning processing.
[0020]
The inner plate 4 is fixed to the pulley portion 2 by a fastening means such as a rivet 5a and rotates integrally with the pulley portion 2. In the present embodiment, the inner plate 4 and the pulley portion 2 are used to make claims. The described drive-side rotator is configured.
[0021]
The inner hub 6 is fixed to the rotary shaft 102 of the compressor 100 and rotates integrally with the rotary shaft 102. In this embodiment, the inner hub 6 is spline (see JIS B 1601 etc.) or serration (JIS B 1602 etc.). The inner hub 6 is prevented from dropping off from the rotating shaft 102 with the bolt 7 in a state where the inner hub 6 is prevented from rotating around the rotating shaft 102 by a coupling method such as the above.
[0022]
The outer plate 8 is fixed to the inner hub 6 by fastening means such as a rivet 5b and rotates integrally with the inner hub 6. In the present embodiment, the outer plate 8 and the inner hub 6 are used to claim the outer plate. The driven-side rotating body described in (1) is configured.
[0023]
The damper 9 is an elastic member that contacts the inner plate 4 that forms part of the driving side rotating body and the outer plate 8 that forms part of the driven side rotating body, and transmits torque from the inner plate 4 to the outer plate 8. In this embodiment, the elastic material does not vary greatly in a relatively wide temperature range, for example, a synthetic rubber such as chlorinated butyl rubber, acrylonitrile butadiene rubber, or ethylene propylene rubber.
[0024]
Then, as shown in FIG. 3, the inner peripheral side of the damper 9 is fitted to a serrated cylindrical portion 4a formed on the inner plate 4 and is prevented from rotating, and the contact surface 9a is adhesive or The contact surface 9b on the outer peripheral surface side of the damper 9 is covered with a protective film 10 having anisotropy whose mechanical strength differs depending on the direction. In addition, as shown in FIG. 1, it is indirectly in contact with the outer plate 8 through the protective film 10.
[0025]
In this embodiment, the protective film 10 is made of PTFE (tetrafluoroethylene resin) having a thickness of about 400 μm, and the single protective film 10 is attached to the damper 9 from the front side of the sheet of FIG. In a state where it is covered, the damper 9 and the inner plate 4 are sandwiched between the upper mold and the lower mold on the front side of FIG. The protective film 10 is bonded to the damper 9 while the protective film 10 is formed into a shape along the shape of the damper 9.
[0026]
At this time, the direction in which the mechanical strength of the protective film 10 is maximized (the direction parallel to the hatched line in FIG. 3) is 45 ° with respect to the direction of the force acting on the protective film 10 as the torque is transmitted. A protective film 10 is coated and adhered to the damper 9.
[0027]
In the present embodiment, as described above, since one protective film 10 is placed on the damper 9 from the front side of the sheet of FIG. 3A, as shown in FIG. It is difficult for the direction in which the mechanical strength is maximized to be 45 ° with respect to the direction of the force acting on the protective film 10 as the torque is transmitted.
[0028]
Therefore, ideally, the direction in which the mechanical strength of the protective film 10 is maximized should be 45 ° with respect to the direction of the force acting on the protective film 10 as the torque is transmitted. The angle formed by both directions may be 45 ° ± 20 °.
[0029]
Next, the function and effect of this embodiment will be described.
[0030]
Torque transmitted to the pulley portion 2 and the inner plate 4 is transmitted to the damper 9. And since the outer peripheral surface side of the damper 9, that is, the contact surface 9b side, is fitted to the serrated cylindrical portion 8a provided on the outer plate 8 and is prevented from rotating similarly to the inner peripheral side. 8 and damper 9 and the engagement rotation axis 102 torque transmitted to the damper 9 is transmitted to the outer plate 8 by of you rotation.
[0031]
At this time, the damper 9 is elastically deformed to absorb the torque fluctuation, and when the torque transmitted to the damper 9 exceeds a predetermined value, the damper 9 is greatly deformed and the damper 9 and the outer plate 8 are fitted to each other. Since the (engaged) state is relatively shifted, torque transmission is interrupted and the torque limiter function is exhibited.
[0032]
Further, since the direction in which the mechanical strength of the protective film 10 is maximized is approximately 45 ° with respect to the direction of the force acting on the protective film 10 as torque is transmitted, the mechanical strength of the protective film 10 is increased. It can be prevented that the low direction and the direction of the force acting on the protective film 10 coincide with the transmission of torque.
[0033]
Therefore, it is possible to prevent the contact surface 9b of the damper 9 from coming into direct contact with the outer plate 8 due to a crack occurring in the protective film 10, etc. It is possible to prevent the torque limiter function from malfunctioning.
[0034]
When torque is transmitted, stress tends to concentrate on the corner portion 9c surrounded by the ellipse in FIG. 3. Therefore, the direction in which the mechanical strength of the protective film 10 is maximized at least at the corner portion 9c is accompanied by torque transmission. Therefore, it is desirable that the angle is approximately 45 ° with respect to the direction of the force acting on the protective film 10.
[0035]
(Second Embodiment)
In the first embodiment, the direction in which the mechanical strength is maximized is approximately 45 ° with respect to the direction of the force acting on the protective film 10 as the torque is transmitted. However, in the present embodiment, the protective film 10 The direction in which the wear strength is maximum is 45 ° ± 20 ° with respect to the direction of the force acting on the protective film 10 as the torque is transmitted.
[0036]
When the direction in which the mechanical strength is maximum and the direction in which the wear strength is maximum match, the first embodiment and the second embodiment match, but when both directions are different, both directions Is preferably within a range of 45 ° ± 20 ° with respect to the direction of the force acting on the protective film 10.
[0037]
(Third embodiment)
In the above-described embodiment, the driving side rotating body is driven via the V-belt . However, in this embodiment, the rotor 11 corresponding to the pulley portion 2 is coupled to the coupling 12 as shown in FIG. It is connected to the drive shaft 13 via
[0038]
(Other embodiments)
In the above-described embodiment, the contact surface 9a on the inner peripheral side of the damper 9 is bonded to the inner plate 4, and thus the protective film 10 is not covered. However, the inner peripheral side of the damper 9 is also the same as the outer peripheral side. In the case where only the inner plate 4 is fitted (engaged), it is desirable to coat the protective film 10 also on the contact surface 9a side.
[0039]
Moreover, the material of the protective film 10 and the damper 9 is not limited to what was shown by the above-mentioned embodiment, Other materials may be sufficient.
[Brief description of the drawings]
FIG. 1 is a half sectional view showing a state in which a torque transmission device according to a first embodiment of the present invention is mounted on a compressor as a driven machine.
FIG. 2 is a left side view of FIG.
FIG. 3 is an explanatory diagram for explaining the features of the present invention.
FIG. 4 is an explanatory diagram for explaining the features of the present invention.
FIG. 5 is a half sectional view showing a state in which a torque transmission device according to a third embodiment of the present invention is mounted on a compressor serving as a driven machine.
[Explanation of symbols]
4 ... Inner plate, 9 ... Damper.

Claims (4)

A torque transmission device that transmits torque generated by a drive source to a driven machine,
A drive-side rotating body (2, 4) that rotates by receiving torque from the drive source;
A driven-side rotating body (6, 8) that rotates integrally with the rotating shaft on the driven machine side;
Elasticity that has a contact surface (9b) that contacts the driven-side rotator (6, 8) and transmits torque from the drive-side rotator (2, 4) to the driven-side rotator (6, 8). A damper (9) made of material,
The damper (9) is formed in an annular shape, and on its outer peripheral side, there are provided four engaging portions that bulge radially outward to form the contact surface (9b),
The four engaging portions are arranged at equal intervals in the circumferential direction of the damper (9),
The contact surface (9b) is covered with a single protective film (10) having anisotropy with different mechanical strength depending on the direction,
Further, the protective film (10) is arranged so that the direction in which the mechanical strength is maximum is along any one of the center lines connecting the centers of the opposing engaging portions. 9), the direction in which the mechanical strength is maximized in the portion of the contact surface (9b) where stress is concentrated during torque transmission is the protection film (10). A torque transmission device that is coated so as to be 45 ° ± 20 ° with respect to the direction of the force acting on the motor. A torque transmission device that transmits torque generated by a drive source to a driven machine,
A drive-side rotating body (2, 4) that rotates by receiving torque from the drive source;
A driven-side rotating body (6, 8) that rotates integrally with the rotating shaft on the driven machine side;
Elasticity that has a contact surface (9b) that contacts the driven-side rotator (6, 8) and transmits torque from the drive-side rotator (2, 4) to the driven-side rotator (6, 8). A damper (9) made of material,
The damper (9) is formed in an annular shape, and on its outer peripheral side, there are provided four engaging portions that bulge radially outward to form the contact surface (9b),
The four engaging portions are arranged at equal intervals in the circumferential direction of the damper (9),
The contact surface (9b) is covered with a single protective film (10) having anisotropy with different wear strength depending on the direction,
Furthermore, the said protective film (10) is the said damper (9) so that the direction where the said abrasion strength becomes the maximum may follow any one among the centerlines which connected the centers of the said engaging parts which oppose. ) In the contact surface (9b) where the stress is concentrated at the portion where the stress is concentrated during the transmission of torque acts on the protective film (10) as the torque is transmitted. The torque transmission device is characterized by being coated so as to be 45 ° ± 20 ° with respect to the direction of the force to be applied.   The torque transmission device according to claim 1 or 2, wherein the protective film (10) is made of PTFE, and the damper (9) is made of rubber. Of the engaging portions, a central recess in the circumferential direction of the damper (9) is provided with a recessed portion that is recessed in the radially inward direction of the damper (9).
The torque transmission device according to any one of claims 1 to 3, wherein the center line is a line that connects the most radially inward sides of the concave portions facing each other.

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