JP2004197928A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission device to be used for a compressor, reducing the size of the compressor in the axial direction of a rotating shaft. <P>SOLUTION: The power transmission device comprises a leaf spring 12 arranged between a drive plate 5 and a hub 10 in parallel to a direction perpendicular to the axial direction of the rotating shaft 7 and having one end detachably connected to a pin mounted on the hub 10 in the direction perpendicular to the axial direction of the rotating shaft 7 and the other end connected to a protrusion 6 formed on the drive plate 5. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a power transmission device in a compressor.
[0002]
[Prior art]
FIG. 11 is a sectional view of a main part of an example of a conventional power transmission device of this type, and FIG. 12 is an exploded perspective view of a main part of the power transmission device of FIG. In these figures, reference numeral 101 denotes a housing of a clutchless compressor, and a pulley 104 as a first transmission member is rotatably supported on a boss portion 102 of the housing via a bearing 103. The housing 101 houses a rotating shaft 105 that is coaxially arranged with respect to the boss 102 and protrudes outward from the boss 102, and has a bolt 106 and a washer 107 at its end. A hub 108 as a second transmission member is fixed.
[0003]
A disc-shaped cover member 110 is fixed to the hub 108 via rivets 109, and a plurality of recesses 111 are formed on the periphery thereof at predetermined angular intervals on the same circumference centered on the rotation shaft 105. Is formed. A cylindrical cushion rubber 112 is adhesively fixed in each of the recesses 111, and one end thereof is formed with a hole for rotatably accommodating the rolling ball 113 so as to partially project.
[0004]
On the surface of the pulley 104 facing the cover member 110, a hole 115 for rotatably accommodating each rolling ball 113 is formed on the same circumference. A hole 116 for dropping the rolling ball 113 detached from the hole 115 is formed.
[0005]
A belt (not shown) is wound around the outer periphery of the pulley 104, and the belt is connected to a crankshaft of an engine (not shown). When the engine is driven, the pulley 104 rotates, and power is transmitted to the rotating shaft 105 via the rolling ball 113, the cushion rubber 112, the cover member 110, and the hub 108.
[0006]
When the load torque exceeds a predetermined value due to an abnormality such as burning in the inside of the clutchless compressor, each cushion rubber 112 is deformed and detached from the rolling ball 113, and each rolling ball 113 is covered with a cover. The member 110 is pushed by the member 110, separates from the hole 115, and enters the hole 116. As a result, the transmission of power from the pulley 104 to the rotating shaft 105 is interrupted, and the pulley 104 idles (see Patent Document 1).
[0007]
[Patent Document 1]
JP 2000-87850 A
[Problems to be solved by the invention]
In the above-mentioned prior art, there is a problem that the structure is complicated, the number of parts and the number of manufacturing steps are large, the production is troublesome, and the manufacturing cost is high. Since the cover member 110 is attached to the cover member 110, and the cover member 110 is formed with the concave portion 111 for accommodating the cushion rubber 112, there is also a problem that the device becomes larger in the axial direction of the rotary shaft 105.
[0009]
The present invention has been made in view of the above problems, and has as its object to simplify the structure to reduce the manufacturing time and the manufacturing cost, and to reduce the axial dimension of the rotary shaft of the compressor. To provide a power transmission device in a compressor.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is characterized in that the first transmission members 4 and 5 rotatably supported by the boss portion 2 of the compressor housing 1 and the coaxial shape with respect to the boss portion 2. And a second transmission member 10 connected to a second transmission member 10 fixed to the end of a rotating shaft 7 protruding outward from the boss portion 2 to the second transmission member 10. And the power transmission from the first transmission member 4, 5 to the second transmission member 10 is cut off when the load torque of the compressor exceeds a predetermined value,
The first transmission members 4 and 5 and the second transmission member 10 are arranged in parallel with a direction orthogonal to the axial direction of the rotating shaft 7, and one end is provided with the second transmission member 10 or the first transmission member 4. , 5 is detachably connected in a direction perpendicular to the axial direction of the rotary shaft 7 and the other end is connected to one of the first transmission members 4, 5 or the second transmission member 10. A power transmission device comprising a flat plate-shaped connecting member 12.
[0011]
According to a second aspect of the present invention, in the power transmission device according to the first aspect, the other end of the connecting member 12 is rotatably supported by the first transmission member 4, 5 or the second transmission member 10. It is characterized by having.
[0012]
According to a third aspect of the present invention, in the power transmission device of the second aspect, the connecting member 12 having one end detached from one of the second transmission member 10 and the first transmission members 4 and 5 is connected to the first transmission member. A locking means 19 is provided for locking in the other one of the transmission members 4, 5 and the second transmission member 10 and a region which does not come into contact with the members provided thereon.
[0013]
According to a fourth aspect of the present invention, in the power transmission device of the third aspect, the locking means 19 is provided on the second transmission member 12 and slides the connecting member 12 with respect to the second transmission member 12. It is characterized by comprising a resilient member for pressing as much as possible.
[0014]
According to a fifth aspect of the present invention, in the power transmission device according to any one of the first to fourth aspects, the connecting member 12 has one end of the second transmission member 10 or the first transmission member 4, 5. And a slit 16 extending from the through hole 14 to the edge of the connecting member 12, and the first transmission members 4, 5 at the other end. Alternatively, the second transmission member 10 has a through hole 15 that fits into the projection 6 provided on the other of the second transmission member 10.
[0015]
According to a sixth aspect of the present invention, in the power transmission device of the fifth aspect, the projection 13 is an elastic body.
[0016]
According to a seventh aspect of the present invention, in the power transmission device according to the fifth or sixth aspect, the protrusion 6 is integrally formed with one of the first transmission members 4 and 5 and the second transmission member 10. And the projection 13 is formed integrally with either the second transmission member 10 or the first transmission members 4 and 5.
[0017]
According to an eighth aspect of the present invention, in the power transmission device according to any one of the fifth to seventh aspects, the connecting member 12 is provided between the first transmission members 4 and 5 and the second transmission member 10. It is characterized by being sandwiched between.
[0018]
According to a ninth aspect of the present invention, in the power transmission device according to any one of the first to eighth aspects, a plurality of plate members of the same shape and the same size, in which the connecting member 12 is punched into a predetermined shape, are formed in the thickness direction. It is characterized by being superimposed on.
[0019]
【The invention's effect】
According to the first aspect of the present invention, since it can be easily manufactured with a small number of parts and man-hours, the manufacturing time can be reduced and the manufacturing cost can be reduced. Further, since the connecting member 12 is formed in a plate shape and is arranged between the first transmission members 4 and 5 and the second transmission member 10 in parallel with a direction orthogonal to the rotation shaft 7, the rotation shaft 7 can be reduced in the axial direction.
[0020]
According to the third aspect of the present invention, since the connecting member 12 does not come into contact with the second transmission member 10 or the first transmission members 4, 5 and the members provided thereon after power is cut off, noise is generated. do not do.
[0021]
According to the seventh aspect of the present invention, since the number of parts is reduced, the manufacturing time can be further reduced and the manufacturing cost can be reduced.
[0022]
According to the eighth aspect of the present invention, since caulking for preventing the connecting member 12 from coming off from the projections 6 and the projections 13 becomes unnecessary, the manufacturing time can be further shortened and the manufacturing cost can be reduced. Can be.
[0023]
According to the ninth aspect of the present invention, since the connecting member 12 is constituted by a plurality of sheets of the same shape and the same size which are cut out in a predetermined shape, the workability at the time of the punching is improved and the dimensional accuracy is improved. improves. Further, as compared with the case where the connecting member 12 is formed of a single plate, the torque value when the transmission of power is interrupted by excessive torque is further stabilized.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a side view of a main part of a first embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is a side view of a main part showing a state after power is cut off, and FIG. FIG.
[0025]
In FIG. 2, reference numeral 1 denotes a housing of a clutchless compressor, and a pulley 4 is rotatably supported on a boss 2 of the compressor via a bearing 3. A drive plate 5 is fixed to one end surface of the pulley 4 with bolts or the like. On one end surface of the drive plate 5, a plurality of columnar projections 6 are formed at a constant angular interval on the same circumference around the rotation shaft 7. The pulley 4 and the drive plate 5 constitute a first transmission member.
[0026]
The housing 1 accommodates a rotating shaft 7 which is coaxially arranged with respect to the boss portion 2 and protrudes outward from the boss portion 2, and has a bolt 8 and a washer 9 at its end. The hub 10 (second transmission member) is fixed. As shown in FIG. 1, the hub 10 is formed in a substantially triangular shape, and a plurality of pin insertion holes 11 (see FIG. 2) have an angular interval of 120 ° on the same circumference around the rotation shaft 7. Is formed.
[0027]
The hub 10 is connected to the drive plate 5 via a plurality of strip-shaped leaf springs 12 (connection members) of the same shape and size. The leaf spring 12 is made of a spring material such as high anthrax steel, and is disposed between the drive plate 5 and the hub 10 in parallel with the direction orthogonal to the rotating shaft 7. One end of the leaf spring 12 is inserted into the pin insertion hole 11. A first through-hole 14 (see FIG. 4) rotatably fitted to the outer peripheral portion of the pin 13 (projection) is formed, and a second through-hole rotatably fitted to the outer peripheral portion of the projection 6 at the other end. 15 (see FIG. 4).
[0028]
In addition, a slit 16 is formed at one end of the leaf spring 12 so as to extend in the longitudinal direction beyond the first through hole 14 from a leading edge thereof. The diameter of the first through hole 14 is slightly smaller than the diameter of the pin 13, and when the pin 13 is pressed into the first through hole 14, the inner peripheral portion of the first through hole 14 becomes the leaf spring 12. Due to the elasticity of the pin 13, the pin 13 is pressed against the outer peripheral portion of the pin 13 and adheres without any gap. When the load torque exceeds a predetermined value due to seizure or the like inside the clutchless compressor, the width of the slit 16 is such that the pin 13 fitted in the first through hole 14 spreads the slit 16 to the outside. It is set so that you can get out.
[0029]
The leaf spring 12 is formed with a slit 18 extending from the second through hole 15 toward the other end. The diameter of the second through-hole 15 is slightly smaller than the diameter of the protrusion 6, and the protrusion 6 before the head is caulked is pressed into the second through-hole 15 to form the second through-hole 15. The inner peripheral portion is pressed against the outer peripheral portion of the projection 6 by the elasticity of the leaf spring 12 and closely adheres without any gap. Then, the head of the protrusion 6 is crimped to form a flange (see FIG. 2) so that the connecting member 12 does not come off from the protrusion 6.
[0030]
Next, the operation of the power transmission device configured as described above will be described. When the load torque on the compressor side is equal to or less than a predetermined value, the power of the engine applied to the pulley 4 via a belt (not shown) is supplied to the hub 10 via the protrusion 6 of the drive plate 5, the leaf spring 12, and the pin 13. And the rotating shaft 7 rotates.
[0031]
When the load torque exceeds a predetermined value due to seizure or the like inside the compressor, each pin 13 is strongly pressed against a portion of the slit 16 on the distal end side of the leaf spring 12, and this portion is expanded in the width direction. The pin 13 fitted in the first through hole 14 is separated from the leaf spring 12 through the slit 16. As a result, transmission of power from the pulley 4 to the rotary shaft 2 is interrupted, and the pulley 4 idles. Note that a cylindrical elastic body may be used instead of the pin 13, and this elastic body may be elastically deformed and pass through the slit 16.
[0032]
Each leaf spring 12 detached from the pin 13 is rotatable around the projection 6, but the pin 13 collides and rotates toward the outer peripheral portion of the pulley 4, and the centrifugal force causes the drive plate 5 to rotate. It rides on and is locked on the formed projection-shaped locking means 19 (see FIG. 3). In this state, since the hub 10 and the pin 13 do not contact the leaf spring 12, no noise is generated.
[0033]
This power transmission device has a simple structure and a small number of parts and man-hours compared to the above-described prior art, so that it is possible to reduce the manufacturing time and the manufacturing cost. Further, since the leaf spring 12 is formed in a plate shape and is arranged between the drive plate 5 and the hub 10 in parallel with a direction orthogonal to the rotating shaft 7, the axial size of the rotating shaft 7 is small. There is an advantage that the clutchless compressor can be easily installed at the installation location.
[0034]
Next, a second embodiment of the present invention will be described. FIG. 5 is a sectional view of a main part of the second embodiment. In the following embodiments, the same portions as those in the first embodiment are denoted by the same reference numerals, and overlapping description is omitted.
[0035]
In the present embodiment, instead of the pin 13 of the first embodiment, a projection 20 rotatably fitted to one end of the leaf spring 12 is formed integrally with the hub 10 on a surface of the hub 10 facing the pulley 4. Have been. Further, a protrusion 6 rotatably fitted to the other end of the leaf spring 12 is formed integrally with the pulley 4. By doing so, the number of parts is further reduced, so that the manufacturing time can be further reduced and the manufacturing cost can be reduced.
[0036]
In the present embodiment, the leaf spring 12 is sandwiched between the hub 10 and the pulley 4 so that the movement in the thickness direction is restricted. Since it is not necessary to perform caulking on the protrusion 6 to prevent the protrusion 6 from slipping out, the manufacturing cost can be further reduced.
[0037]
Next, a third embodiment of the present invention will be described. 6 is a partially cutaway side view of the third embodiment of the present invention, FIG. 7 is a sectional view taken along line BB of FIG. 6, FIG. 8 is a sectional view taken along line CC of FIG. 6, and FIG. It is a side view which shows the state of.
[0038]
In the present embodiment, each leaf spring 12 is formed by connecting a pair of side pieces 12a in a bifurcated manner. The outer peripheral portion of the projection 6 is radially sandwiched by the distal end of one end, and the other end is turned by the pin 13 It is pivotally supported. The leaf spring 12 is formed by laminating two plate members of the same shape and the same size punched in a predetermined shape in the thickness direction. By doing so, the punching process is facilitated, the workability is improved, and burrs and deformation are less likely to occur, and the dimensional accuracy is improved.
[0039]
Further, in the present embodiment, the locking means 19 is formed of a washer-shaped resilient member concentrically attached to the outer peripheral portion of the shaft portion 10a of the hub 10. The locking means 19 has a peripheral portion bent toward the flange portion 10b of the hub 10, and slidably presses and locks each leaf spring 12 against the back surface of the flange portion 10b of the hub 10. .
[0040]
In this power transmission device, when the load torque of the compressor exceeds a predetermined value, each projection 6 pushes apart the tip of one end of the leaf spring 12 to separate from the leaf spring 12, and the power from the pulley 4 to the hub 10 Transmission is interrupted. Then, each leaf spring 12 collides with the protrusion 6 that orbits along the trajectory T shown by a dashed line in FIG. 6, and rotates inside the trajectory T while sliding on the locking means 19 (see FIG. 9). It is locked in a region not in contact with the protrusion 6.
[0041]
If the leaf spring 12 is detached from the pulley 4 that continues to rotate after the power transmission is cut off as in the present embodiment, the leaf spring 12 hits the worker because the leaf spring 12 does not rotate during maintenance. Can be prevented from being injured.
[0042]
Further, the width X (see FIG. 7) of the clearance between the leaf spring 12 and the pulley 4 needs to be equal to or larger than a predetermined size, but there is no means for positioning the leaf spring 12 in the axial direction of the rotary shaft 7. In this case, the width X may be smaller than a predetermined size due to variations in parts, etc., so that it is necessary to insert a shim between the distal end surface of the rotating shaft 7 and the hub 10 for adjustment. When the leaf spring 12 is pressed against the hub 10 by the locking means 19 as in the present embodiment, a width X equal to or larger than a predetermined size can be secured, so that there is an advantage that labor for adjustment can be omitted.
[0043]
Next, a fourth embodiment of the present invention will be described. FIG. 10 is an enlarged view of a main part of the fourth embodiment of the present invention.
[0044]
In the present embodiment, both ends of one end of the leaf spring 12 are in a state of projecting sideways. Further, a slit 22 is formed which extends in the longitudinal direction from the tip edge of one end of the leaf spring 12 to the other end of the leaf spring 12. An engaging portion 21 having a fitting recess 23 into which one end of the leaf spring 12 fits is formed in the hub 10.
[0045]
When the load torque of the clutchless compressor is equal to or less than a predetermined value, the state where one end of the leaf spring 12 is fitted into the fitting concave portion 23 of the locking portion 21 is maintained and power is transmitted (FIG. 10A). If the load torque exceeds a predetermined value, one end of the leaf spring 12 is elastically deformed so as to reduce the width and detaches from the fitting recess 23 (see FIG. 10B), and the power is shut off. It is supposed to be.
[0046]
The present invention is not limited to the above embodiment, and various modifications can be made to the above embodiment without departing from the spirit of the present invention.
[Brief description of the drawings]
FIG. 1 is a side view of a main part of a first embodiment of the present invention.
FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is an essential part side view showing a state after power is cut off according to the first embodiment;
FIG. 4 is a plan view of a leaf spring.
FIG. 5 is a sectional view of a main part of the second embodiment.
FIG. 6 is a partially cutaway side view of the third embodiment.
FIG. 7 is a sectional view taken along line BB of FIG. 6;
FIG. 8 is a sectional view taken along line CC of FIG. 6;
FIG. 9 is a main part side view showing a state after power is cut off according to the third embodiment;
FIG. 10 is an enlarged view of a main part of the fourth embodiment.
FIG. 11 is a sectional view of a main part of an example of a conventional power transmission device.
FIG. 12 is an exploded perspective view of a main part of the power transmission device of FIG. 11;
[Explanation of symbols]
Reference Signs List 1 housing 2 boss 4 pulley (first transmission member)
5 Drive plate (first transmission member)
7 rotating shaft 10 hub (second transmission member)
12 Leaf spring (connecting member)

Claims (9)

A first transmission member (4, 5) rotatably supported by a boss (2) of a housing (1) of the compressor; a first transmission member (4, 5) disposed coaxially with the boss (2); The second transmission member (10) fixed to the end of the rotating shaft (7) protruding outward from the second transmission member (2) is connected to the first transmission member (4, 5). 10) and power transmission from the first transmission member (4, 5) to the second transmission member (10) when the load torque of the compressor exceeds a predetermined value. That
The first transmission member (4, 5) and the second transmission member (10) are disposed in parallel with a direction orthogonal to the axial direction of the rotating shaft (7), and one end of the second transmission member (10) is disposed between the first transmission member (4, 5) and the second transmission member (10). ) Or the first transmission member (4, 5) is detachably connected in a direction orthogonal to the axial direction of the rotation shaft (7), and the other end is connected to the first transmission member (4, 5). Alternatively, a power transmission device comprising a plate-shaped connection member (12) connected to one of the other second transmission members (10). The power transmission device according to claim 1, wherein the other end of the connecting member (12) is rotatably supported by the first transmission member (4, 5) or the second transmission member (10). . The connecting member (12), one end of which is detached from either the second transmission member (10) or the first transmission member (4, 5), is connected to the first transmission member (4, 5) or the second transmission member. 3. A power transmission device according to claim 2, further comprising a locking means (19) for locking in any one of (10) and a region not in contact with a member provided thereon. The locking means (19) is formed of a resilient member provided on the second transmission member (12) and slidably pressing the connecting member (12) against the second transmission member (12). The power transmission device according to claim 3, wherein The coupling member (12) has a through hole (14) fitted at one end to a projection (13) provided on one of the second transmission member (10) and the first transmission member (4, 5). A slit (16) extending from the through hole (14) to the edge of the connecting member (12), and the other end of the first transmission member (4, 5) or the second transmission member (10) is provided at the other end. The power transmission device according to any one of claims 1 to 4, further comprising a through hole (15) that fits into the projection (6) provided on one of the other sides. Power transmission device according to claim 5, characterized in that the projections (13) are elastic. The projection (6) is formed integrally with either the first transmission member (4, 5) or the second transmission member (10), and the projection (13) is formed on the second transmission member (10). 7. The power transmission device according to claim 5, wherein the power transmission device is formed integrally with one of the first transmission members. 8. The method according to claim 5, wherein the connecting member is sandwiched between the first transmission member and the second transmission member. Power transmission device. 9. The connecting member according to claim 1, wherein the connecting member is formed by stacking a plurality of sheets of the same shape and size stamped into a predetermined shape in the thickness direction. 10. Power transmission device.

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