JP2005221052A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission device capable of preventing adhesion of a seal part to a peripheral surface of a driven side rotor and a peripheral surface of a pushing member, and capable of surely showing a power shut-off function. <P>SOLUTION: Non-adhesive surface treatment is performed to an inner peripheral surface 13b of the seal part 13a by roughly machining the surface, and contact area of a pressure-contact part of the seal part 13a with a peripheral surface of a hub 14 and a peripheral surface of a push ring 16 is formed small. With this structure, adhesion of the pressure-contact part is prevented even in the case of using for a long time, and power is always shut off by the set torque, and the power shut-off function is surely exerted. Since satin finish processing to the inner peripheral surface 13b of the seal part 13 is performed by forming a surface of a vulcanizing mold of a buffer rubber 13 into satin finish, satin finish can be easily formed at low cost, and it is profitable when practically making. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a power transmission device used in, for example, a compressor of a vehicle air conditioner.

  Generally, as a compressor used in an air conditioner for a vehicle, a compressor body formed in a hollow shape, a compression unit that compresses fluid sucked into the compressor body, and a drive shaft connected to the compression unit And the drive shaft is rotated by the power of the engine to drive the compression section to suck and discharge the refrigerant.

  Further, the power transmission device provided in the compressor includes a pulley to which power from the outside is transmitted, an outer ring fixed to the pulley, a driving side rotating body arranged on the inner diameter side of the outer ring, and an outer ring. And a rubber cushion for connecting the drive side rotator by vulcanization bonding, a plurality of balls for transmitting the rotational force of the drive side rotator to the driven side rotator, and pressing each ball in the axial direction toward the driven side rotator Each of the balls pressed by the ball presser is engaged with the inner peripheral surface side of the driving side rotating body to transmit the rotational force of the driving side rotating body to each ball, When a torque of a predetermined magnitude or more is generated between the driven-side rotating body and the balls engaged with the driving-side rotating body, the balls are moved inward in the radial direction of the driving-side rotating body against the pressing force of the pressing member. The drive-side rotator and Those from the drive side rotating body to release the engagement of the ball so as to cut off the power transmitted to the driven-side rotating body is known (e.g., see Patent Document 1.).

In the power transmission device, the ball and the member that contacts the ball are formed of a metal material such as iron. Therefore, when rust is generated on the ball or the like, the power shut-off function is impaired. In order to prevent this, a seal portion is formed by a part of the buffer rubber at a position facing the outer peripheral surface of the driven-side rotary member and the outer peripheral surface of the pressing member on the inner peripheral surface side of the driving-side rotary member, and the driven-side rotary member is rotated. The outer peripheral surface of the body and the outer peripheral surface of the pressing member are brought into pressure contact with the seal portion, thereby preventing water from entering from the outside to each ball side.
JP 2001-153152 A

  However, in the power transmission device, since the outer peripheral surface of the driven-side rotating body and the outer peripheral surface of the pressing member are in pressure contact with each other, the buffer rubber and the outer peripheral surface of the driven-side rotating body and the pressing member are in long-term use. The outer peripheral surface of the adhesive member sticks, and the movement resistance of the driven side rotating body and the pressing member at the time of power interruption increases. For this reason, there is a problem that the power is not cut off with the set torque and the power cut-off function is impaired.

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to prevent adhesion between the seal portion and the outer peripheral surface of the passive-side rotating body and the outer peripheral surface of the pressing member, and to reliably shut off the power. It is providing the power transmission device which can exhibit.

  In order to achieve the above-mentioned object, the present invention provides an annular drive-side rotator that is rotated by external power, a driven-side rotator that is disposed on the inner peripheral surface side of the drive-side rotator, and a drive-side rotator. Provided with a plurality of balls for transmitting rotational force to the driven side rotating body and a pressing member for pressing each ball in the axial direction, and locking each ball pressed by the pressing member to the inner peripheral surface side of the driving side rotating body As a result, the rotational force of the drive-side rotator is transmitted to each ball, and when a torque of a predetermined magnitude or more is generated between the drive-side rotator and the driven-side rotator, By moving the ball against the pressing force of the pressing member inward in the radial direction of the driven-side rotator, the drive-side rotator and the balls are unlocked to change from the drive-side rotator to the driven-side rotator. It is configured to cut off the transmitted power and follows the inner peripheral surface side of the drive side rotor. In the power transmission device provided with the seal portions that respectively contact the outer peripheral surface of the side rotating body and the outer peripheral surface of the pressing member, the contact surface between the seal portion and the driven side rotating body and the contact surface between the seal portion and the pressing member are provided. Each is formed by applying a non-adhesive surface treatment.

  As a result, the contact surface between the seal portion and the driven-side rotating body and the contact surface between the seal portion and the pressing member are formed by performing non-adhesive surface treatment, so that the seal can be used even in long-term use. And the outer peripheral surface of the driven side rotating body and the outer peripheral surface of the pressing member do not stick.

  According to the power transmission device of the present invention, it is possible to prevent adhesion between the seal portion and the outer peripheral surface of the driven-side rotator and the outer peripheral surface of the pressing member even in long-term use. It can be shut off and the power shut-off function can be exhibited reliably.

  1 to 4 show a first embodiment of the present invention. FIG. 1 is a side sectional view of a power transmission device, FIG. 2 is a sectional view in the direction of arrows AA in FIG. 1, and FIG. Side surface sectional drawing which shows the operation | movement at the time of interruption | blocking, FIG. 4 is principal part side surface sectional drawing of a power transmission device.

  This power transmission device is used in a compressor of a vehicle air conditioner, and transmits power to a drive shaft 2 protruding from one end of a compressor body 1.

  The power transmission device according to the present embodiment includes a pulley 10 to which power from the outside is transmitted, an outer ring 11 fixed to the pulley 10, and an inner ring 12 as a drive side rotating body arranged coaxially with the outer ring 11. A shock absorbing rubber 13 for connecting the outer ring 11 and the inner ring 12, a hub 14 as a driven side rotating body connected to the drive shaft 2, and a plurality of balls for transmitting the rotational force of the inner ring 12 to the hub 14. 15 and a pressing ring 16 that presses each ball 14 in the axial direction.

  The pulley 10 is configured such that a V belt (not shown) is wound around the outer peripheral surface, and is rotatably supported by the compressor main body 1 via a bearing 10 a disposed between the inner peripheral surface and the compressor main body 1. Has been.

  The outer ring 11 is made of metal and has an L-shaped cross section, and is fixed to the pulley 10 with a bolt 11a.

  On the inner peripheral surface of the inner ring 12, a locking portion 12a that locks each ball 15 from the outside in the radial direction is provided. A plurality of tapered surfaces 12b having a predetermined angle with each other are formed on the inner peripheral surface of the locking portion 12a, and each ball 15 is positioned on the radially outer side by contacting the adjacent tapered surfaces 12b. ing.

  A seal portion 13 a is integrally formed on the inner peripheral surface of the buffer rubber 13, and the inner peripheral surface 13 b of the seal portion 13 a is in pressure contact with the outer peripheral surface of the hub 14 and the outer peripheral surface of the pressing ring 16. Further, the inner peripheral surface 13b of the seal portion 13a is subjected to a non-adhesive surface treatment by roughing the surface into a pear skin shape. In addition, this non-adhesive surface treatment can be applied by forming the surface of the vulcanization mold of the buffer rubber 13 roughly like a pear skin.

  The hub 14 is formed in a disk shape and is disposed on the inner peripheral surface side of the inner ring. One end surface of the hub 14 is provided with a connecting portion 14 a for connecting the drive shaft 2, and the drive shaft 2 is fixed to the hub 14 by a nut 14 b that is screwed from the other end surface side of the hub 14. The other end surface of the hub 14 is provided with a plurality of ball grooves 14c that are engaged with the respective balls 15 so as to be movable in the radial direction at intervals in the circumferential direction, and each ball 15 is formed on the inner peripheral surface of the ball groove 14c. The hub 14 is locked in the circumferential direction. Further, a convex portion 14d protruding in the axial direction is provided on the outer side in the radial direction of each ball groove 14c, and the convex portion 14d comes into contact with the ball 15 positioned on the outer side in the radial direction of the ball groove 14c in the axial direction. Yes. Furthermore, an extending portion 14e extending in a cylindrical shape in the axial direction is provided at the radial center of the other end surface of the hub 14 so as to cover the nut 14b.

  The balls 15 are spaced from each other in the circumferential direction of the hub 14, and are disposed in the ball grooves 14 c of the hub 14.

  The pressing ring 16 is engaged with the extending portion 14 e of the hub 14 so as to be movable in the axial direction, and one end surface thereof is in contact with each ball 15. One end surface of the pressing ring 16 is provided with an inclined surface 16a that gradually protrudes in the axial direction from the radially outer side to the inner side, and is positioned on the radially outer side of each of the ball grooves 14c on the radially outer side of the inclined surface 16a. The balls 15 are in contact with each other. A disc spring 16b that engages with the extending portion 14e of the hub 14 is provided on the other end surface side of the pressing ring 16, and the pressing ring 16 is urged toward the ball 15 by the disc spring 16b. The disc spring 16b is disposed in a compressed state between an annular nut 16c that is screwed into the extending portion 14e and the pressing ring 16, and the pressing force of the pressing ring 16 by the disc spring 16b is adjusted by adjusting the tightening force of the nut 16c. The pressure can be set arbitrarily.

  In the above configuration, when the engine power is input to the pulley 10, the outer ring 11 rotates together with the pulley 10. The rotational force of the outer ring 11 is transmitted to the inner ring 12 via the buffer rubber 13, and the buffer rubber 13 is elastically deformed between the outer ring 11 and the inner ring 12, whereby rotational fluctuations input from the engine side are caused. Absorbed. Further, the rotational force of the inner ring 12 is transmitted to the ball groove 14c of the hub 14 through the locking portions 12b and the balls 15, and the drive shaft 2 rotates together with the hub 14. At that time, each ball 15 is pressed in the axial direction by the disc spring 16b and guided to the outside in the radial direction of each ball groove 14c by the inclined surface 16a of the pressing ring 16, so that each ball 15 is a tapered surface of the locking portion 12b. By abutting on 12 c, the rotational force of the inner ring 12 is transmitted to the hub 14.

  Here, for example, if excessive torque is applied to the pulley 10 side, such as seizure of the compressor, and a torque of a predetermined magnitude or more is generated between the inner ring 12 and the hub 14, the locking portion 12b By pressing the taper surface 12c, each ball 15 moves inward in the radial direction of the ball groove 14c against the pressing force of the disc spring 16b as shown in FIG. Accordingly, each ball 15 is held radially inward of the ball groove 14c by the convex portion 14d of the ball groove 14c and the pressing ring 16, and each ball 15 is restrained at a position where it cannot be locked with the locking portion 12b. The inner ring 12 idles with respect to the hub 14, and the transmission of power from the pulley 10 side to the drive shaft 2 is interrupted.

  Further, since the seal portion 13a is integrally formed on the inner peripheral surface of the buffer rubber 13, and the inner peripheral surface 13b of the seal portion 13a is in pressure contact with the outer peripheral surface of the hub 14 and the outer peripheral surface of the pressing ring 16, each ball Water or the like does not enter the 15 side, and the ball 15 and surrounding metal parts do not rust.

  Further, since the non-adhesive surface treatment is performed by roughing the inner peripheral surface 13b of the seal portion 13a, the pressure contact portion between the seal portion 13a, the outer peripheral surface of the hub 14 and the outer peripheral surface of the pressing ring 16 The contact area becomes smaller and the pressure contact portion does not stick.

  As described above, according to this embodiment, the inner peripheral surface 13b of the seal portion 13a is subjected to a non-adhesive surface treatment by roughing the surface, and the outer periphery of the seal portion 13a, the hub 14 and the pressing ring 16 are processed. Since the contact area of the press-contact portion with the surface is reduced, the press-contact portion does not stick even in long-term use, the power is always shut off with the set torque, and the power shut-off function is reliably exhibited.

  Moreover, in the said embodiment, since the pear skin-like process to the internal peripheral surface 13b of the seal | sticker part 13a was performed by forming the surface of the vulcanization molding die of the buffer rubber 13 in the pear skin shape, it is easy and inexpensive. This is extremely advantageous for practical use.

  In the embodiment, the example in which the non-adhesive surface treatment is performed by roughing the surface of the inner peripheral surface 13b of the seal portion 13a has been shown. However, as shown in FIG. A non-adhesive surface treatment may be performed by forming a lubricating film 13c on 13b. In this case, since the frictional resistance of the press contact portion between the seal portion 13a and the outer peripheral surface of the hub 14 and the outer peripheral surface of the pressing ring 16 is reduced as in the above embodiment, the press contact portion does not stick even in long-term use. The power is cut off with the set torque, and the power cut-off function is reliably exhibited. The lubricating coating 13c is formed by coating the inner peripheral surface 13b of the seal portion 13a with a solid coating lubricant such as PTFE, lubricating oil, grease or the like.

  Furthermore, in the said embodiment, although the non-adhesive surface treatment was given to the inner peripheral surface 13b of the seal part 13a, a non-adhesive surface treatment may be given to the outer peripheral surface of the hub 14 and the outer peripheral surface of the press plate 16. It is possible to apply both.

Side surface sectional drawing of the power transmission device which shows 1st embodiment of this invention. AA arrow direction sectional view of FIG. Side sectional view showing operation when power is cut off Side view of the main part of the power transmission device Side view of the main part of the power transmission device

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Outer ring, 12 ... Inner ring, 13 ... Buffer rubber, 13a ... Seal part, 13b ... Inner peripheral surface, 13c ... Lubricious film, 14 ... Hub, 15 ... ball, 16 ... pressing ring.

Claims (4)

An annular drive-side rotating body that is rotated by power from the outside, a driven-side rotating body that is disposed on the inner peripheral surface side of the driving-side rotating body, and a plurality that transmits the rotational force of the driving-side rotating body to the driven-side rotating body And a pressing member that presses each ball in the axial direction, and the balls pressed by the pressing member are locked to the inner peripheral surface side of the driving side rotating body, thereby reducing the rotational force of the driving side rotating body. When the torque is transmitted to each ball and a torque of a predetermined magnitude or more is generated between the driving side rotating body and the driven side rotating body, each ball locked to the driving side rotating body is resisted against the pressing force of the pressing member. By moving the driven-side rotator radially inward, the drive-side rotator and each ball are unlocked, and the power transmitted from the drive-side rotator to the driven-side rotator is cut off. The outer peripheral surface of the driven rotor and the outside of the pressing member A power transmission device provided with a seal portion for contacting respective surfaces,
The power transmission device, wherein the contact surface between the seal portion and the driven-side rotator and the contact surface between the seal portion and the pressing member are each subjected to non-adhesive surface treatment. The power transmission device according to claim 1, wherein the non-adhesive surface treatment is performed by roughing a surface of at least one contact surface. The power transmission device according to claim 1 or 2, wherein the non-adhesive surface treatment is performed by forming a lubricating film on a surface of at least one contact surface. The power transmission device according to claim 3, wherein the lubricating film is formed by coating a surface of a contact surface with a lubricant.

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