JP2008095792A - Power transmitting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmitting apparatus which is improved in durability and reliability concerning power intercepting characteristic, etc. while preventing the increase of the cost and the size of a product, and the deterioration of its assembly workability. <P>SOLUTION: The power transmitting apparatus comprises: a driving-side rotary member and a driven-side rotary member which are concentrically arranged; a connecting member which elongates between both rotary members and connects both rotary members; and fixing members for fixing the respective rotary members and the connecting member, wherein the power is transmitted from the driving-side rotary member to the driven-side rotary member via the connecting member, and the power transmission is intercepted by disengaging any of the fixing members from the connecting member when the transmitted power has exceeded a preset value. The fixing member to be disengaged from the connecting member is composed of a rod shape fixing member which is different from the rotary members and the connecting member, and the rotary members and the connecting member are fixed by caulking the rod shape fixing member in the axial direction of the rod shape fixing member such that the rod shape fixing member can disengage from the connecting member. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power transmission device that transmits power from a driving side rotating member to a driven side rotating member so that the power transmission can be interrupted when the transmitted power becomes excessive.

As a power transmission device having a power cutoff function, for example, a power transmission device that transmits a driving force from a driving source to a compressor so that the power transmission can be cut off when the transmission power becomes excessive is disclosed in Patent Document 1, Patent It is described in Document 2, Patent Document 3, and the like. In the power transmission devices described in these patent documents, for example, as shown in FIG. 8, power from a drive source (for example, an engine) is transmitted to a drive-side rotation member 101 formed of a pulley, and the drive-side rotation member 101. Is rotated in the 102 direction. The driving force of the driving side rotating member 101 is transmitted to the driven side rotating member 104 connected to the driving shaft side of the compressor via a leaf spring 103 as a connecting member. One end of the leaf spring 103 is fixed to the driven side rotating member 104 via a pin or protruding fixing member 105, and the other end is fixed to the driving side rotating member 101 via a pin or protruding fixing member 106. ing. The fixing members 105 and 106 are integrally provided on any of the rotating members 101 and 104 and the leaf spring 103. In the fixing portion to the driving side rotating member 101, the fixing member 106 is sandwiched from both sides by the distal end portion of the leaf spring 103. When the transmission power becomes excessive, the fixing member 106 is detached from the leaf spring 103. The drive-side rotation member 101 is idled with respect to the driven-side rotation member 104 so that power transmission is interrupted.
JP 2004-197928 A JP 2004-197929 A JP 2005-308203 A

The conventional power transmission device as described above has the following problems.
First, because the power is transmitted by sandwiching the outer peripheral portion of the fixing member 106 only in the radial direction at the tip of the leaf spring 103, the pinching contact portion is fretting worn (by torque fluctuation due to vibration or rotation fluctuation of the drive source). (Surface wear due to minute relative sliding under a load) may occur, the pinching force may decrease, and malfunction (power transmission may be interrupted below a predetermined value) may occur. That is, there is a risk that the durability is lowered and the reliability of the power transmission cutoff characteristic is lowered.

  In addition, in order to generate a pinching force that can withstand vibrations, it is necessary to increase the leaf spring 103 thickness, number of stacked sheets, material strength, hardness, etc., which increases the cost, size, and assembly of the product. Invite the deterioration.

  Further, a portion of the tip portion of the leaf spring 103 that sandwiches the fixing member 106 from both sides extends in the extending direction of the leaf spring 103, and the opening of the leaf spring 103 also opens along the extending direction of the leaf spring 103. It is formed to do. Therefore, when power transmission is interrupted, the leaf spring 103 starts rotating about the center of the fixing member 105 first, and then the fixing member 106 is detached from the tip of the leaf spring 103. Therefore, if the pinching force on the fixing member 106 side is increased, fretting wear may also occur on the fixing member 106 side, which may cause malfunction due to breakage of the fixing member 106, etc. There is a possibility that the reliability of the power transmission cutoff characteristic may be lowered.

  Accordingly, an object of the present invention is to focus on the problems in the prior art as described above, and to improve the reliability in terms of durability, power shut-off characteristics, etc. while preventing an increase in product cost, an increase in size, and a deterioration in assemblability. It is to provide a transmission device.

  In order to solve the above problems, a power transmission device according to the present invention includes a drive side rotation member and a driven side rotation member that are concentrically arranged, and a drive side rotation that extends between the drive side rotation member and the driven side rotation member. A driving member having a connecting member that connects the member and the driven side rotating member, a first fixing member that fixes the driving side rotating member and the connecting member, and a second fixing member that fixes the driven side rotating member and the connecting member; Power is transmitted from the side rotating member to the driven side rotating member via the connecting member, and when the transmitted power exceeds a set value, the first fixing member or the second fixing member is detached from the connecting member to transmit the power. In the power transmission device, the fixing member separated from the connecting member is constituted by a columnar fixing member separate from the rotating member and the connecting member, and the columnar fixing member is formed by the columnar fixing member. Is it a connecting member? By caulking the axial direction of the releasably columnar fixing member consists of those characterized by fixing the coupling member and the rotating member.

  In the power transmission device according to the present invention, the fixing member that is separated when the excessive power is transmitted is composed of a columnar fixing member that is separate from both the rotating member and the connecting member. It can be crimped by plastic deformation. When the columnar fixing member is interposed between the rotating member and the connecting member and pressed from both sides and caulked in the axial direction, the force for clamping the rotating member and the connecting member from both sides and the caulking in the axial direction The holding force from the inner diameter side due to the expansion of the columnar fixing member in the radial direction makes it possible to securely fix the rotating member and the connecting member with the optimum fixing force according to the caulking force, and excessive power. It is possible to reliably perform predetermined separation at the time of transmission. Since this caulking force can be easily controlled to the target force by controlling the axial pressure force of the fixing member, the fixing force via the fixing member of the rotating member and the connecting member can be easily adjusted to the target force. It can be controlled well. In addition, since the fixing by caulking is basically due to plastic deformation of the columnar fixing member, minute relative sliding occurs between the fixing member and the rotating member and between the fixing member and the connecting member. There is no factor and no fretting wear occurs. Therefore, the initially set power cutoff characteristic is maintained as it is, and durability and reliability of the power cutoff characteristic are improved.

  In addition, since the target durability and power shut-off characteristics are secured by caulking, it is necessary to increase the plate thickness of the connecting member, stack multiple connecting members, or use a special material for the connecting member Therefore, the cost increase, the increase in size, and the deterioration in assemblability associated with them are surely prevented. Furthermore, since the desired good durability and power cut-off characteristics can be obtained simply by caulking and controlling the caulking force, the assembly can be performed very easily.

  In the power transmission device according to the present invention, it is preferable that the connecting member is provided with a notch that opens in the rotation direction of the rotating member so that the columnar fixing member can be detached from the connecting member. Since the connecting member and the rotating member are fixed with the optimal fixing force as described above by caulking the columnar fixing member, when the fixing member separates from the connecting member during excessive power transmission, the connecting member and the rotating member should be smoothly separated without any obstacles. Is desired. Therefore, when the connection member is provided with the cutout in the above direction, the fixing member can be smoothly detached from the connection member without being caught.

  When providing the notch, the connecting member is formed with a hole through which the columnar fixing member is inserted, and the width of the notch is set to be equal to or smaller than the diameter of the hole. It is preferable to adopt. In other words, the disengagement is facilitated by providing the notch, but it is desirable to hold the fixing member in the hole portion as reliably as possible before the disengagement. Therefore, it is preferable to employ such a structure.

  Moreover, as the columnar fixing member, a rivet-shaped member having a columnar shaft portion and a head having a diameter larger than that of the columnar shaft portion at one end thereof can be used, and the rivet-shaped member is caulked in the axial direction. do it. By using such a rivet-shaped member, both assembly and caulking can be easily performed.

  Moreover, as a connection member, it can form in a flat member with comparatively thin thickness. As a result, it is possible to achieve downsizing of the entire apparatus while providing the desired power transmission and excessive transmission power cutoff functions.

  Moreover, it is preferable that a plurality of connecting members are arranged in the rotation direction of the rotating member (for example, three equally arranged in the rotating direction). With the multiple arrangements, normal power transmission (except when excessive transmission power is generated) can be performed more smoothly.

  Moreover, it is preferable that the connecting member is fixed to the rotating member so as to be rotatable around a fixing member on the side opposite to the fixing member separated from the connecting member. If comprised in this way, at the time of transmission power interruption | blocking, it will be easy to rotate itself so that the connection member from which the fixing member was disengaged from one end may not get in the way (so that one rotating member can be idled). And it becomes possible to evacuate appropriately.

  In particular, when the connecting member is disposed so as to be inclined in the rotation direction of the rotation member with respect to the radial direction of the rotation member, the rotation is performed more smoothly, and a smoother force is also obtained during normal power transmission. The transmission direction can be adjusted appropriately, and torque fluctuations can be appropriately handled.

  In the power transmission device according to the present invention, a disk fixed to the rotating member so as to be integrally rotatable is provided between the driving side rotating member and the connecting member or between the driven side rotating member and the connecting member. It is also possible to adopt a structure in which the disk and the connecting member are fixed via a fixing member. The disk only needs to be tightly fixed to the corresponding rotating member by bolting or the like, and may be configured as an integral body with the rotating member. By providing such a disk, for example, the connection between the disk and the connecting member via the fixing member, and in some cases, the rotating member on the opposite side of the rotating member with which the disk is integrated and the fixing member for the connecting member are provided. It is possible to tentatively assemble as a pre-assembled part, including the connection through the connector. In this way, when the temporarily assembled assembly disk is assembled on the corresponding rotating member side, a predetermined assembly is completed, and the assemblability is further improved. Further, since the caulking can be performed at the assembly stage, the caulking force can be controlled more easily.

  Further, in the power transmission device according to the present invention, after the detachment of the fixing member from the connecting member, the rotating member or the disc is abutted against the connecting member supported by the other anti-detachment side fixing member. It is also possible to adopt a structure in which a pin-like protrusion for rotating the member around the anti-separation side fixing member is provided. That is, as described above, it is desirable that the connecting member from which the fixing member has been detached is quickly retracted so as not to get in the way, so that the connecting member is abutted against the connecting member for the rotation. This is a structure in which a dedicated pin-like protrusion for rotating the member is provided. Note that this pin-like protrusion does not function except when the fixing member is detached.

  When adopting such a structure, it is preferable that the pin-shaped protrusion is provided at a position farther in the radial direction of the rotating member than the detachable side fixing member with respect to the anti-detaching side fixing member. In this way, the connecting member can be smoothly rotated with a smaller force.

  The power transmission device according to the present invention can basically be applied as a power transmission device in any device, but in particular, there is a torque fluctuation in the drive source, and it is required to maintain high-accuracy excessive transmission power cutoff performance. It is effective in the case. For example, this is effective when the drive source of the drive side rotation member is a motor for a vehicle. In that case, it is particularly suitable as a power transmission device used for a compressor.

  Thus, according to the power transmission device of the present invention, the durability can be improved and the reliability of the power shut-off characteristics can be improved without incurring an increase in cost, an increase in size of the device, and a deterioration in assemblability. . It is also possible to achieve setting of the cutoff power, facilitation of control, high accuracy, and stable maintenance thereof.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
1A and 1B show a power transmission device according to a first embodiment of the present invention, in which FIG. 1A is a front view thereof, and FIG. 1B is a cross-sectional view taken along line BB in FIG. . In FIG. 1, reference numeral 1 denotes a driving side rotating member composed of a pulley to which driving force is transmitted from an engine (not shown) via a belt or the like, and 2 is a follower connected and fixed to a driving shaft of a compressor, for example. Side rotating members are shown and are arranged concentrically. The drive side rotating member 1 is supported via a bearing 3 so as to be rotatable with respect to the main body side of a compressor or the like. The driving side rotating member 1 and the driven side rotating member 2 are connected via a connecting member 4 made of a flat plate member, and the power from the driving side rotating member 1 is connected via the connecting member 4 to the driven side rotating member 2. To be communicated to.

  The driving side rotating member 1 and one end of the connecting member 4 are fixed by a first fixing member 5, and the driven side rotating member 2 and the other end of the connecting member 4 are fixed by a second fixing member 6. It is fixed. In this embodiment, when the power from the driving side rotating member 1 is transmitted to the driven side rotating member 2 via the connecting member 4, the first fixing member 5 is connected when the transmitted power exceeds a set value. By separating from the member 4, the power transmission is cut off. It is also possible to cut off this power transmission on the second fixing member 6 side. A fixing member configured to be able to be detached from the connecting member 4 for interrupting power transmission, in the present embodiment, the first fixing member 5 is a columnar shape that is completely separate from the rotating members 1 and 2 and the connecting member 4. It is comprised by the fixing member. In this embodiment, the fixing member 5 is composed of a rivet-like member having a head 8 having a diameter larger than that of the columnar shaft portion 7 on one end side of the columnar shaft portion 7 before the mounting. By being caulked in the axial direction, the driving side rotating member 1 and the connecting member 4 are fixed via the fixing member 5 (9 indicates a caulking portion). In the present embodiment, the same fixing structure by caulking is also adopted on the second fixing member 6 side that is not intended to be detached, but the fixing structure on this side is not particularly limited. However, when the fixing member 5 is detached from the connecting member 4, the connecting member 4 is set to be rotatable around the second fixing member 6.

  In the present embodiment, the three connecting members 4 are arranged in the rotational direction (the direction of the arrow R in FIG. 1A), and each connecting member 4 is in the radial direction of the rotating members 1 and 2. Are inclined in the rotation direction R. Each connecting member 4 is formed with a hole portion 10 through which the columnar shaft portion 7 of the first fixing member 5 is inserted. The hole portion 10 is connected to the hole portion 10 and opens in the rotation direction R of the rotating member. A notch 11 is provided. Through this notch 11, the first fixing member 5 can be detached in the rotation direction R of the rotating member.

  2A and 2B show a power transmission device according to a second embodiment of the present invention, in which FIG. 2A is a front view thereof, and FIG. 2B is a cross-sectional view taken along line BB in FIG. . The second embodiment differs from the first embodiment shown in FIG. 1 only in that a disk (disk-shaped member) fixed to the one rotating member so as to rotate integrally therewith is provided. Since the other parts are basically the same as those in the first embodiment, the same members as those shown in FIG. 1 are denoted by the same reference numerals as those in FIG. In the structure shown in FIG. 2, a disk 21 is provided between the driving side rotating member 1 and the connecting member 4 so as to be able to rotate integrally with the driving side rotating member 1, and the disk 21 is interposed via a fixing bolt 22. The drive-side rotating member 1 is fixed. Therefore, the drive side rotation member 1 and the disk 21 in FIG. 2 can be combined and regarded as the drive side rotation member in the present invention. Note that reference numeral 23 in FIG. 2 denotes a hole formed in the drive side rotating member 1 in order to avoid interference with the caulking fixing member 5. By providing such a disk 21, as described above, for example, the disk 21 and the connecting member 4 can be assembled first via the fixing member 5, and the assembly is attached to the drive side rotating member 1 with a bolt. It becomes possible to conclude. As a result, it is possible to facilitate the assembly, to facilitate the control of the caulking force of the fixing member 5, and to facilitate the setting of the power cut-off characteristics and to increase the accuracy.

  The relationship between the notch 11 and the hole 10 formed in the connecting member 4 in each of the above embodiments is illustrated in FIGS. 3A and 3B in the case of the second embodiment. In the form shown in FIG. 3A, the notch 11 is formed by being curved along the circumferential direction of the disk 21, and the width W of the notch 11 is represented by the difference between the curvature radii R1 and R2. . In this case, it is preferable that the relationship between the diameter φH of the hole 10 and the width W (= R1-R2) of the notch 11 satisfies φH ≧ (R1-R2). By satisfying this relationship, the fixing member 5 is more securely held in the hole 10 before the fixing member 5 is detached. 3B, the notch 11 is opened in a linearly extending shape, and the relationship between the width W and the diameter φH of the hole 10 satisfies φH ≧ W. Preferably it is.

  FIGS. 4A and 4B sequentially show the state when the fixing member 5 is caulked. As shown in FIG. 4A, before caulking, the fixing member 5 has a columnar shaft portion 7 and a head at one end thereof. 8. The columnar shaft portion 7 of the fixing member 5 is inserted into the hole portion 10 of the connecting member 4 and the hole 24 formed in the disk 21 (FIG. 4B), and is opposite to the head portion 8 of the columnar shaft portion 7. The side end is caulked (FIG. 4C). The caulking portion 9 is formed by plastic deformation. In addition, it is preferable that the diameter of the hole 10 of the connecting member 4 and the hole 24 of the disk 21 is set slightly larger than the outer diameter of the columnar shaft portion 7, thereby facilitating insertion.

  When caulked as described above, as shown in FIG. 5, a strong fixing force is exerted in the axial direction by the head portion 8 and the caulking portion 9 of the fixing member 5, and the disk 21 and the connecting member 4 are securely fixed. The Further, since the columnar shaft portion 7 is expanded in the radial direction during caulking, the columnar shaft portion 7 applies a compressive force to the inner peripheral surface of the hole portion 10 of the connecting member 4 and the hole 24 of the disk 21. The fixing member 5 is fixed to the disk 21 and the connecting member 4 with certainty. Thus, the connecting member 4 is held with a desired force by caulking the fixing member 5 accompanied by plastic deformation. When the connecting member 4 and the disk 21 are fixed via the fixing member 5, the detaching force of the fixing member 5 from the connecting member 4 can be controlled by the caulking force of the fixing member 5. In this case, it is possible to easily set the optimum force by controlling the force applied from both sides of the fixing member 5 in the axial direction. Therefore, the cutoff power value when the excessive transmission power is generated is set to a desired value with high accuracy. The Thus, the excessive transmission power for detaching the fixing member 5 from the connecting member 4 is accurately and easily set to a desired value by fixing by caulking accompanied by plastic deformation of the fixing member 5.

  6 shows how the fixing member 5 is detached from the connecting member 4 when an excessive transmission power exceeding the set value is applied to the embodiment shown in FIG. 2 (the basic embodiment is also shown in FIG. 1). Is exactly the same). As shown in FIG. 6 (A), when excessive transmission power is applied, a deforming force in the direction of expanding the portion 31 located on the outer side in the radial direction to the hole 10 and the notch 11 of the connecting member 4 works. The distal end portion of the connecting member 4 is deformed mainly so as to cut the inner contact surface portion of the portion 31. As a result, the fixing member 5 is detached from the connecting member 4 through the deformed notch 11, and the power transmission performed from the driving side rotating member 1 and the disk 21 to the driven side rotating member 2 via the connecting member 4 is cut off. (FIG. 6B). Even after the power transmission is cut off, the disk 21 side is rotated (idled), but as shown in FIG. 6C, the fixing bolt 22 rotates and hits the front shoulder of the connecting member 4 to fix the connecting member 4. Rotate around the member 6. When the connecting member 4 is rotated to the position shown in FIG. 6D, the drive-side rotating member 1 and the disk 21 are rotated without interfering with the connecting member 4, and the desired power transmission interruption is completed. To do.

  When the connecting member 4 is rotated around the fixing member 6 immediately after the power transmission is cut off, as shown in FIG. 7 showing a modified example of the apparatus of FIG. Further, a structure in which a pin-like protrusion 41 that is abutted against the connecting member 4 supported by the other anti-separation side fixing member 6 and rotates around the anti-separation side fixing member 6 is provided. Is preferred. In particular, the pin-like protrusion 41 is provided at a position farther in the radial direction of the rotating members 1 and 22 than the separation-side fixing member 5 (position on the outer diameter side in the radial direction) with respect to the anti-detachment-side fixing member 6. It is preferable. By providing such a dedicated pin-like protrusion 41, the connecting member 4 from which the fixing member 5 is detached can be quickly and retracted with less impact so as not to get in the way. In particular, by providing the pin-like protrusion 41 at a position closer to the outer diameter side than the fixing bolt 22 in the radial direction, the connecting member 4 can be smoothly rotated with a smaller impact.

  The power transmission device according to the present invention is basically applicable as a power transmission device in any device. In particular, it is suitable for power transmission when there is torque fluctuation in the drive source, for example, for power transmission using a vehicle prime mover as a drive source (for example, driving a compressor using a vehicle prime mover as a drive source). is there.

It is sectional drawing which follows the BB line of the front view (A) and figure (A) of the power transmission device which concerns on 1st embodiment of this invention. It is sectional drawing which follows the BB line of the front view (A) and figure (A) of the power transmission device which concerns on the 2nd embodiment of this invention. It is an enlarged partial front view which shows the structural example of the connection member front-end | tip part of the apparatus of FIG. It is a schematic fragmentary sectional view which shows the mode of caulking of the fixing member of the apparatus of FIG. It is a schematic sectional drawing of the connection member front-end | tip part which shows the completion state of crimping of FIG. It is a schematic partial front view which shows the mode at the time of detachment | leave of the fixing member of the apparatus of FIG. It is a front view of the power transmission device which concerns on the modification of FIG. It is a front view of the conventional power transmission device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive side rotating member 2 Driven side rotating member 3 Bearing 4 Connection member 5 1st fixing member (columnar fixing member)
6 Second fixing member 7 Columnar shaft portion 8 Head portion 9 Caulking portion 10 Hole portion 11 of connecting member Notch 21 Disk 22 Fixing bolt 23 Hole 24 formed on drive side rotating member Hole 31 formed on disk Connecting member Portion 41 located on the radially outer side of the hole portion and the notch 41 Pin-like protrusion R

Claims (13)

  A driving side rotating member and a driven side rotating member arranged concentrically, a connecting member extending between the driving side rotating member and the driven side rotating member, and connecting the driving side rotating member and the driven side rotating member; and a driving side rotating member And a first fixed member that fixes the connecting member and a driven side rotating member and a second fixing member that fixes the connecting member, and transmits power from the driving side rotating member to the driven side rotating member via the connecting member. In addition, in the power transmission device in which the first fixing member or the second fixing member is detached from the connecting member and the power transmission is interrupted when the transmission power exceeds a set value, the power transmitting device is detached from the connecting member. The fixing member is composed of a columnar fixing member separate from the rotating member and the connecting member, and the columnar fixing member is caulked in the axial direction of the columnar fixing member so that the columnar fixing member can be detached from the connecting member. By Power transmission apparatus characterized by fixing the the rotary member connecting member.   2. The power transmission device according to claim 1, wherein the connecting member is provided with a notch that opens in a rotation direction of the rotating member, and the columnar fixing member is detachable from the connecting member.   The power transmission device according to claim 2, wherein a hole portion through which the columnar fixing member is inserted is formed in the connecting member, and a width of the notch is set to be equal to or smaller than a diameter of the hole portion.   The columnar fixing member includes a columnar shaft portion and a rivet-shaped member having a head having a diameter larger than that of the columnar shaft portion at one end thereof, and the rivet-shaped member is caulked in an axial direction. A power transmission device according to claim 1.   The power transmission device according to claim 1, wherein the connecting member is a flat plate member.   The power transmission device according to any one of claims 1 to 5, wherein a plurality of the connecting members are arranged in a rotating direction of the rotating member.   The power transmission device according to any one of claims 1 to 6, wherein the connecting member is fixed to the rotating member so as to be rotatable around a fixing member opposite to the fixing member separated from the connecting member.   The power transmission device according to any one of claims 1 to 7, wherein the connecting member is disposed to be inclined in a rotation direction of the rotation member with respect to a radial direction of the rotation member.   A disk fixed to the rotating member so as to be integrally rotatable is provided between the driving side rotating member and the connecting member or between the driven side rotating member and the connecting member, and the disk and the connecting member are The power transmission device according to claim 1, wherein the power transmission device is fixed via a fixing member.   After the fixing member is detached from the connecting member on the rotating member or the disc, it is abutted against the connecting member supported by the other anti-removing side fixing member, and the connecting member is rotated around the anti-detaching side fixing member. The power transmission device according to claim 1, wherein a pin-like protrusion is provided.   The power transmission device according to claim 10, wherein the pin-shaped protrusion is provided at a position farther in the radial direction of the rotating member than the detachable fixing member with respect to the anti-detaching fixing member.   The power transmission device according to any one of claims 1 to 11, wherein a drive source of the drive side rotation member is a motor for a vehicle.   The power transmission device according to any one of 1 to 12, which is used for a compressor.

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