JP4193317B2 - Resin pulley - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin pulley having a resin-made pulley body, and is effective when applied to a resin pulley that transmits power to a compressor of a vehicle air conditioner.
[0002]
[Prior art]
As shown in FIG. 4, the inventors have used a metal insertion fitting (as a resin pulley for a power transmission device with a torque limiter function that is applied to a compressor of a vehicle air conditioner, at a site where a bearing 300 is press-fitted. The one provided with the sleeve 113 was insert-molded together with the resin pulley body 112.
[0003]
[Problems to be solved by the invention]
By the way, in the case where the pulley body is made of metal, the heat generated in the bearing is radiated to the atmosphere via the metal pulley body, whereas in the prototype product shown in FIG. Since the main body 112 is made of resin, it is difficult to dissipate the heat generated in the bearing 300 to the atmosphere via the pulley main body 112, which may reduce the durability of the bearing.
[0004]
In view of the above points, an object of the present invention is to quickly dissipate heat generated in a bearing in a resin pulley.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a resin pulley that is rotatably supported via a bearing (300) and on which a belt for power transmission is hung. A pulley body (112) made of resin on which a belt is hung, and a metal insertion fitting (113) disposed in a portion of the pulley body (112) where the bearing (300) is fitted and contacting the bearing (300) The insertion fitting (113) is integrated with the pulley main body (112) by insert molding. Further, the insertion fitting (113) is axially extended from the portion in contact with the bearing (300). A heat dissipating part (113d) is provided so that the inner peripheral surface is exposed to air, and the insertion fitting (113) has one end in the axial direction, which is the side where the heat dissipating part (113d) is provided, protruding radially outward. Iruko Te The features.
[0006]
As a result, heat generated in the bearing (300) can be quickly dissipated, so that the durability of the bearing (300) is improved by a simple means such as providing the heat dissipating part (113d) in the insertion fitting (113). Can be made.
[0007]
In the invention according to claim 2, the insertion metal fitting (113) is integrally formed with the substantially cylindrical metal fitting main body (113a) and the metal fitting main body (113a), and extends over the entire circumference of the metal fitting main body (113a). It is characterized by having a flange portion (113b, 113c) protruding in the radial direction.
[0008]
Thereby, a flange part (113b, 113c) functions as a reinforcement rib, the rigidity of an insertion metal fitting (113) can be improved, and durability of a resin pulley can be improved.
[0009]
In the third aspect of the present invention, flange portions (113b, 113c) are provided at both axial ends of the metal fitting main body portion (113a), and the metal fitting main body portion (113a) of the flange portions (113b, 113c) is provided. Only the flange portion (113b) on one end side in the axial direction is in contact with the pulley body (112).
[0010]
As a result, the other end in the axial direction of the metal fitting main body (113a) is opened, and it is possible to prevent thermal stress accompanying thermal expansion of the pulley main body (112) from being generated in the pulley main body (112). Due to the difference in coefficient of thermal expansion between the main body (112) and the insertion fitting (113), it is possible to prevent any one from being largely distorted.
[0011]
In the invention according to claim 4, the inner peripheral surface of the metal fitting main body portion (113a) and the bearing (300) are in contact with each other, while the outer peripheral surface of the metal fitting main body portion (113a) and the pulley main body (112) are in contact with each other. Further, flange portions (113b, 113c) are provided at both axial ends of the metal fitting main body portion (113a), and one end side of the metal fitting main body portion (113a) in the axial direction of the flange portions (113b, 113c) is in the radial direction. projecting outwardly, the other axial end protrudes radially inward, further fitting main body portion (113a) axial end portion side Contact Keru outer radius of curvature (r2) is fitting main body portion (113a) wherein the the axial position one end side smaller than the contact Keru outer radius of curvature (r1).
[0012]
This prevents the resin filled from the other axial end of the insertion fitting (113) from flowing into the inner peripheral surface of the insertion fitting (113) when filling the resin. It is possible to prevent the resin from adhering to the inner peripheral surface.
[0013]
The invention according to claim 5 is characterized in that a fitting portion (113e) for fitting with the pulley body (112) is provided on the cylindrical surface of the insertion fitting (113).
[0014]
Thereby, since the insertion fitting (113a) and the pulley body (112) can be firmly coupled, it is possible to prevent slippage between the insertion fitting (113a) and the pulley body (112). The durability of can be improved.
The invention according to claim 6 is characterized in that the fitting portion (113e) is a groove.
[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 this embodiment, a resin pulley (hereinafter abbreviated as a pulley) according to the present invention is applied to a power transmission device with a torque limiter function that transmits power to a compressor of a vehicle air conditioner. FIG. 1 is a sectional view of a power transmission device with a limiter function (hereinafter abbreviated as a transmission device) 100. FIG. Note that the power transmission device with a torque limiter function is a device that shuts off the transmission of power when the transmitted power (torque) exceeds a predetermined value. In FIG. 1, 200 is a front housing of the compressor. The transmission device 100 is rotatably supported by the front housing 200 via a rolling bearing (hereinafter abbreviated as a bearing) 300 attached to a cylindrical protrusion 210 formed on the front housing 200.
[0017]
The transmission device 100 includes a pulley 110 according to the present embodiment in which a bearing 300 is press-fitted and fixed, and a hub 120 that transmits torque transmitted to the pulley 110 to a rotation shaft (shaft) 220 of the compressor. ing.
[0018]
Further, as shown in FIG. 2, the pulley 110 includes a pulley body 112 made of a resin (phenol resin in this embodiment) in which a V-groove 111 on which a V-belt (not shown) is hung is formed on the outer peripheral surface. , The pulley body 112 is composed of a metal (insert metal fitting) 113 made of metal (in this embodiment, iron-based metal) disposed in a portion where the bearing 300 is fitted (press-fitted), The insert fitting 113 is integrated with the pulley body 112 by insert molding.
[0019]
As shown in FIG. 3, the insert metal fitting 113 is formed at a substantially cylindrical metal fitting main body portion 113a and one end portion in the axial direction of the metal fitting main body portion 113a so as to be radially outward over the entire circumference of the metal fitting main body portion 113a. The first flange portion 113b that protrudes and the second flange portion 113c that is formed at the other axial end of the metal fitting main body portion 113a and protrudes radially inward over the entire circumference of the metal fitting main body portion 113a, The pulley body 112 is crimped to the outer wall surface of the insert fitting 113.
[0020]
At this time, both the flange portions 113b and 113c are formed so that the outer curvature radius r2 of the second flange portion 113c is smaller than the outer curvature radius r1 of the first flange portion 113b, and the both flange portions 113b and 113c Of these, only the first flange portion 113b is in pressure contact with the pulley main body 112 from the axial outer side (front housing 200 side) at the axial end portion (front housing 200 side end portion) of the pulley main body 112.
[0021]
Further, a bearing 300 is press-fitted into the metal fitting main body 113a (insert metal fitting 113) so as to come into contact with the inner peripheral surface (inner cylinder surface) at a predetermined surface pressure, and as shown in FIG. A heat dissipating portion 113d is provided that extends from the portion in contact with 300 to the front housing 200 side and is exposed to air. On the other hand, on the outer peripheral surface (outer cylinder surface) of the metal fitting main body portion 113a, as shown in FIG. 3, a fitting groove (fitting portion) 113e for fitting with the pulley main body 112 is formed over the entire outer peripheral surface. Yes.
[0022]
As shown in FIG. 1, the hub 120 and the pulley 110 are configured such that a locking projection 121 formed on the hub 120 is inserted into a locking hole 114 formed on the pulley 110 via an elastic member 122 such as rubber. The hub 120 is connected to the shaft 220 by a spline connection with the shaft 220 and is prevented from falling off by a bolt 123.
[0023]
Next, the outline of the manufacturing method of the insert metal fitting 113 is described.
[0024]
First, press working is performed to form the metal fitting main body portion 113a, the first flange portion 113b, and the second flange portion 113c (first pressing step). Next, press working is performed so that the outer radius of curvature r2 of the second flange portion 113c is smaller than the outer radius of curvature r1 of the first flange portion 113b so that the second flange portion 113c side is narrowed (second pressing step). ).
[0025]
In the second pressing step, pressing is performed so that the second flange portion 113c side is narrowed, so the outer diameter d1 on the second flange portion 113c side is smaller than the outer diameter d2 on the first flange portion 113b side.
[0026]
And the site | part corresponded to the contact surface with the bearing 300 among the internal peripheral surfaces of the insert metal fitting 113 is cut, and it is finished to predetermined surface roughness and a dimension (machining process).
[0027]
Next, features of the present embodiment will be described.
[0028]
According to the present embodiment, the insert fitting 113 is provided with the heat dissipating part 113d that extends from the portion in contact with the bearing 300 to the front housing 200 side and is exposed to air, so that the heat generated in the bearing 300 is quickly dissipated. Can be made. Therefore, the durability of the bearing 300 can be improved by a simple means such as providing the heat dissipating part 113d in the insert fitting 113.
[0029]
In addition, since the first and second flange portions 113b and 113c projecting in the radial direction over the entire circumference of the metal fitting main body portion 113a are formed, the first and second flange portions 113b and 113c function as reinforcing ribs. The rigidity of the insert fitting 113 can be increased, and the durability of the pulley 110 can be improved.
[0030]
By the way, if both the first and second flange portions 113b and 113c protrude outward in the radial direction and the axial direction of the pulley body 112 is sandwiched between the first and second flange portions 113b and 113c, the resin and the metal One of them (in this case, the resin pulley main body 112) may be greatly distorted due to the difference in thermal expansion coefficient.
[0031]
On the other hand, in the present embodiment, only the first flange portion 113b is in contact with the pulley body 112, and the second flange portion 113b is not in contact with the pulley body 112. As a result, the pulley body 112 does not generate thermal stress accompanying thermal expansion of the pulley body 112. Therefore, it is possible to prevent any one from being largely distorted due to the difference in the coefficient of thermal expansion between the pulley body 112 and the insert fitting 113.
[0032]
Moreover, since the fitting groove | channel 113e fitted with the pulley main body 112 is formed in the outer peripheral surface (outer cylinder surface) of the insert metal fitting 113a, the insert metal fitting 113a and the pulley main body 112 can be couple | bonded firmly. Therefore, it is possible to prevent slippage between the insert fitting 113a and the pulley body 112, and to improve the durability of the pulley 110.
[0033]
In the present embodiment, the outer diameter d1 on the second flange portion 113c side becomes smaller than the outer diameter d2 on the first flange portion 113b side by the second pressing step, and the stepped portion 113f (see FIG. 3) is provided on the metal fitting body 113a. Therefore, the insert fitting 113a and the pulley body 112 can be firmly coupled also in the stepped portion 113f.
[0034]
By the way, the insert fitting 113 is integrated with the pulley body 112 by insert molding. However, since the second flange portion 113c protrudes inward, the resin is inserted into the inner peripheral surface of the insert fitting 113 (bearing 300) at the time of insert molding. May adhere to the contact surface.
[0035]
And if resin adheres to the inner peripheral surface (contact surface with the bearing 300) of the insert metal fitting 113, since non-uniform cutting resistance arises with respect to a cutting tool (blade) at the time of a machining process, the workability of machining deteriorates. Resulting in.
[0036]
On the other hand, in the present embodiment, since the outer radius of curvature r2 of the second flange portion 113c is smaller than the outer radius of curvature r1 of the first flange portion 113b, it is parallel to the axial direction on the outer peripheral surface of the insert fitting 113. The length L (see FIG. 3) of the straight line portion can be increased.
[0037]
Therefore, when filling the resin, it is possible to prevent the resin filled from the other axial end side (the second flange portion 113c side) of the insert fitting 113 from flowing into the inner peripheral surface side of the insert fitting 113. It is possible to prevent the resin from adhering to the inner peripheral surface (the contact surface with the bearing 300). Since it can prevent that the workability of machining will deteriorate, it can prevent that the manufacturing man-hour of the insert metal fitting 113 rises.
[0038]
In addition, since the 1st flange part 113b protrudes to the radial direction outer side at the axial direction one end side (1st flange part 113b side) of the insert metal fitting 113, the filled resin flows into the inner peripheral surface side of the insert metal fitting 113. There is almost no.
[0039]
(Other embodiments)
By the way, in the above-described embodiment, only the torque (shearing force) acting between the locking hole 114 and the locking projection 121 is provided between the hub 120 and the pulley 110. Assuming that a taper portion whose cross-sectional area decreases toward the opposite side of the hub 120 (in this embodiment, the front housing 200 side) is formed in the pulley 120, the hub 120 is fitted into the pulley 110. Accordingly, a force (hereinafter referred to as a thrust force) directed toward the opposite side of the hub 120 (in this embodiment, the front housing 200 side) acts on the pulley 110 on the pulley 110.
[0040]
At this time, as in the present invention, the first flange portion 113b is connected to the pulley main body 112 from the axial outer side (front housing 200 side) at the axial end portion (front housing 200 side end portion) of the pulley main body 112. If it is in contact, the first flange portion 113b can receive a thrust force, so that slippage can be prevented between the insert fitting 113a and the pulley body 112, and the durability of the pulley 110 can be improved. Can do.
[0041]
In the above-described embodiment, the resin pulley according to the present invention is applied to a power transmission device with a torque limiter function. However, the present invention is not limited to this and is also applied to other pulleys such as an alternator pulley. can do.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a transmission device employing a pulley according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a pulley according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view of an insert fitting for a pulley according to an embodiment of the present invention.
FIG. 4 is a cross-sectional view of a pulley according to trial manufacture.
[Explanation of symbols]
112 ... Pulley body, 113 ... Insert metal fitting (insert metal fitting),
113a ... metal fitting body, 113b ... first flange part,
113c ... 2nd flange part, 113d ... Heat radiation part.

Claims (6)

A resin pulley that is rotatably supported via a bearing (300) and on which a belt for power transmission is hung;
A resin pulley body (112) on which the belt is hung on an outer peripheral surface;
A metal insertion fitting (113) disposed in a portion of the pulley body (112) in which the bearing (300) is fitted and in contact with the bearing (300);
The insertion fitting (113) is integrated with the pulley body (112) by insert molding,
Furthermore, the insertion fitting (113) is provided with a heat dissipating part (113d) that extends in the axial direction from a portion in contact with the bearing (300) and whose inner peripheral surface is exposed to air ,
The insertion metal fitting (113) is a resin pulley characterized in that one end in the axial direction, which is the side on which the heat dissipating part (113d) is provided, protrudes radially outward . The insertion fitting (113)
A substantially cylindrical metal body (113a);
The metal fitting main body (113a) is integrally formed, and the metal fitting main body (113a) has flange portions (113b, 113c) projecting in the radial direction over the entire circumference. The resin pulley according to claim 1. The flange portions (113b, 113c) are provided at both axial ends of the metal fitting main body portion (113a),
3. The resin according to claim 2, wherein only one end side in the axial direction of the metal fitting main body part (113 a) of the flange parts (113 b, 113 c) is in contact with the pulley main body (112). Pulley. The inner peripheral surface of the metal fitting main body (113a) and the bearing (300) are in contact, while the outer peripheral surface of the metal fitting main body (113a) and the pulley main body (112) are in contact with each other.
The flange portions (113b, 113c) are provided at both axial end portions of the metal fitting main body portion (113a), and one end side in the axial direction of the metal fitting main body portion (113a) of the flange portions (113b, 113c). Protrudes radially outward, the other axial end protrudes radially inward,
Furthermore, the fitting main body portion other axial end portion side Contact Keru outer radius of curvature (r2) of (113a), said fitting body portion (113a) axially position one end to your Keru outer radius of curvature (r1) The resin pulley according to claim 2, wherein the resin pulley is smaller.   The fitting part (113e) fitted with the said pulley main body (112) is provided in the cylindrical surface of the said insertion metal fitting (113), The one of Claim 2 thru | or 4 characterized by the above-mentioned. Resin pulley. The resin pulley according to claim 5, wherein the fitting portion (113e) is a groove.

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