WO2018194075A1 - プーリ構造体 - Google Patents
プーリ構造体 Download PDFInfo
- Publication number
- WO2018194075A1 WO2018194075A1 PCT/JP2018/015921 JP2018015921W WO2018194075A1 WO 2018194075 A1 WO2018194075 A1 WO 2018194075A1 JP 2018015921 W JP2018015921 W JP 2018015921W WO 2018194075 A1 WO2018194075 A1 WO 2018194075A1
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- WIPO (PCT)
- Prior art keywords
- coil spring
- spring
- rotating body
- rotator
- pulley structure
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D41/00—Freewheels or freewheel clutches
- F16D41/20—Freewheels or freewheel clutches with expandable or contractable clamping ring or band
- F16D41/206—Freewheels or freewheel clutches with expandable or contractable clamping ring or band having axially adjacent coils, e.g. helical wrap-springs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
- F16F1/04—Wound springs
- F16F1/06—Wound springs with turns lying in cylindrical surfaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/32—Friction members
- F16H55/36—Pulleys
Definitions
- the present invention relates to a pulley structure provided with a coil spring.
- a belt is stretched over a pulley connected to a drive shaft of the auxiliary machine such as an alternator and a pulley connected to a crankshaft of the engine.
- the torque of the engine is transmitted to the auxiliary machine through this belt.
- the pulley connected to the drive shaft of the alternator having a large inertia as compared with other auxiliary machines has a pulley structure that can absorb the rotational fluctuation of the crankshaft as described in Patent Document 1, for example. Used.
- the pulley structure disclosed in Patent Document 1 includes an outer rotating body, an inner rotating body that is provided inside the outer rotating body and is rotatable relative to the outer rotating body, and a coil spring. Torque is transmitted or interrupted between the outer rotator and the inner rotator by expanding or contracting the diameter.
- the coil spring of this pulley structure is a one-way clutch (coil that transmits or blocks torque in one direction between the outer rotating body and the inner rotating body in order to prevent the belt wound around the outer rotating body from slipping. It functions as a spring-type clutch.
- the portion of the coil spring that slides with the clutch engaging portion can also be worn.
- the clutch engaging portion when the clutch is in the engaged state, the contact surface pressure between the coil spring and the clutch engaging portion is reduced, so that the transmitted torque is reduced.
- the abnormal wear in the clutch engaging portion is a clear concave shape that continues along the circumferential direction in the portion of the clutch engaging portion that slides from the spring end on one end side of the coil spring to the region of one or more rounds. It means that wear occurs.
- the surface that contacts the end surface of the coil spring of the rotating body is a spiral surface, and the end surface in the axial direction of the coil spring is ground.
- a surface (grinding surface) orthogonal to the axial direction of the coil spring to bring one end and the other end of the coil spring in the radial direction into contact with the outer rotating body and the inner rotating body, respectively.
- An object of the present invention is to provide a pulley structure that can more reliably suppress wear of the clutch engaging portion.
- a pulley structure includes a cylindrical outer rotator around which a belt is wound, a radially inner side of the outer rotator, and the same rotational axis as the outer rotator.
- An inner rotating body that can rotate relative to the outer rotating body, a coil spring that is provided between the outer rotating body and the inner rotating body, and is compressed in the axial direction along the rotating shaft, And the coil spring engages with the outer rotator and the inner rotator by torsionally deforming in the direction of diameter expansion or contraction, and torque between the outer rotator and the inner rotator.
- the transmission of the torque between the coil springs can is the M is a natural number, it is within the scope of the following [M-0.125] and not more than M.
- the posture of the coil spring compressed in the axial direction between the outer rotator and the inner rotator is stable, and the moment of force that tends to tilt the coil spring in one direction in a compression load state Can be prevented from acting on the portion of the coil spring that contacts the clutch engaging portion. Therefore, when the coil spring (clutch) is disengaged, the surface pressure acting on the portion of the clutch engaging portion that slides (slips) with the coil spring becomes uniform. Thereby, compared with the case where the winding number of a coil spring is outside the said range, it can suppress that abnormal wear arises in the part which slides with the coil spring of a clutch engaging part.
- the pulley structure according to the second aspect of the present invention is the pulley structure according to the first aspect, wherein the number of turns of the coil spring is in the range of [M-0.069] or more and M or less.
- the posture of the coil spring compressed in the axial direction between the outer rotating body and the inner rotating body is further stabilized, and the coil spring is operated in a compression load state. It can suppress more reliably that the moment of the force which is going to incline in one direction acts on the part which contacts a clutch engaging part of a coil spring. Therefore, when the coil spring (clutch) is disengaged, the surface pressure acting on the portion of the clutch engagement portion that slides with the coil spring is more reliably uniform. Thereby, it can suppress more reliably that abnormal wear arises in the part which slides with the coil spring of a clutch engaging part.
- the pulley structure according to the third aspect of the present invention is the pulley structure according to the first or second aspect, wherein the torsional torque of the coil spring when the coil spring is in the disengaged state is 1N. ⁇ It is set to m or more and 10 N ⁇ m or less.
- the clutch disengagement is limited to a specific driving pattern (for example, when the engine is started).
- the frequency with which the clutch engaging portion and the coil spring slide is increased.
- the disengagement of the clutch is limited to a specific driving pattern (for example, when the engine is started).
- the frequency with which the clutch engaging portion and the coil spring slide is reduced. As a result, it is possible to more effectively suppress wear on the portion of the clutch engaging portion that slides with the coil spring.
- FIG. 1 is a cross-sectional view of a pulley structure according to an embodiment of the present invention.
- FIG. 2 is a sectional view taken along line II-II in FIG.
- FIG. 3 is a sectional view taken along line III-III in FIG.
- FIG. 4 is a side view of the coil spring.
- FIG. 5 is a graph showing the relationship between the twist angle of the coil spring and the twist torque of the pulley structure shown in FIG. 6A and 6B are diagrams for explaining the relationship between the number of turns of the coil spring and the number of overlapping spring wires.
- FIG. 6A shows a case where the number of turns is a natural number M
- FIG. (C) shows a case where the number of windings is slightly larger than the natural number M.
- FIG. 7 is a schematic configuration diagram of the engine bench testing machine used in the test of the example, where (a) is a view seen from the axial direction of the pulley structure, and (b) is orthogonal to the axial direction of the pulley structure. It is the figure seen from the direction.
- FIG. 8 is a graph showing the relationship between the number of turns of the coil spring and the maximum wear depth of the clutch engaging portion in the example and the comparative example.
- the pulley structure 1 of the present embodiment is installed on a drive shaft of an alternator in, for example, an auxiliary machine drive system (not shown) of an automobile.
- the pulley structure 1 includes an outer rotating body 2, an inner rotating body 3, a coil spring 4 (hereinafter sometimes simply referred to as “spring 4”), and an end cap 5.
- spring 4 hereinafter sometimes simply referred to as “spring 4”
- the left side in FIG. 1 will be described as the front side and the right side as the rear side.
- the end cap 5 is disposed at the front ends of the outer rotator 2 and the inner rotator 3.
- Both the outer rotator 2 and the inner rotator 3 are substantially cylindrical and have the same rotation axis.
- the rotating shafts of the outer rotating body 2 and the inner rotating body 3 are rotating shafts of the pulley structure 1 (hereinafter simply referred to as “rotating shaft”). Further, the rotation axis direction is simply referred to as “axial direction”.
- the inner rotator 3 is provided inside the outer rotator 2 and is rotatable relative to the outer rotator 2.
- the belt B is wound around the outer peripheral surface of the outer rotating body 2.
- the inner rotating body 3 has a cylinder main body 3a and an outer cylinder portion 3b disposed outside the front end of the cylinder main body 3a.
- a drive shaft S such as an alternator is fitted to the cylinder body 3a.
- a support groove 3c is formed between the outer cylinder part 3b and the cylinder main body 3a. The inner peripheral surface of the outer cylindrical portion 3b and the outer peripheral surface of the cylindrical main body 3a are connected via a groove bottom surface 3d of the support groove portion 3c.
- a rolling bearing 6 is interposed between the inner peripheral surface of the rear end of the outer rotating body 2 and the outer peripheral surface of the cylinder main body 3a.
- a sliding bearing 7 is interposed between the inner peripheral surface of the front end of the outer rotating body 2 and the outer peripheral surface of the outer cylindrical portion 3b.
- the outer rotator 2 and the inner rotator 3 are connected by bearings 6 and 7 so as to be relatively rotatable.
- a space 9 is formed between the outer rotating body 2 and the inner rotating body 3 and in front of the rolling bearing 6.
- the spring 4 is accommodated in the space 9.
- the space 9 is formed between the inner peripheral surface of the outer rotating body 2 and the inner peripheral surface of the outer cylindrical portion 3b, and the outer peripheral surface of the cylindrical main body 3a.
- a protruding portion 2 c protruding inward in the radial direction is provided at a portion of the outer rotating body 2 located between the rolling bearing 6 and the space 9.
- the inner diameter of the outer rotating body 2 decreases in two steps toward the rear.
- the inner peripheral surface of the outer rotator 2 at the smallest inner diameter portion is referred to as a pressure contact surface 2a
- the inner peripheral surface of the outer rotator 2 at the second smallest inner diameter portion is referred to as an annular surface 2b.
- the inner diameter of the outer rotating body 2 at the pressure contact surface 2a is smaller than the inner diameter of the outer cylinder portion 3b.
- the inner diameter of the outer rotating body 2 on the annular surface 2b is the same as or larger than the inner diameter of the outer cylindrical portion 3b.
- the cylinder body 3a has a large outer diameter at the front end.
- the outer peripheral surface of the inner rotating body 3 in this portion is referred to as a contact surface 3e.
- the spring 4 is a torsion coil spring formed by spirally winding (coiling) a spring wire (spring wire) as shown in FIG.
- the spring 4 is left-handed (counterclockwise from the front end 4a toward the rear end 4g).
- the number of turns of the spring 4 is in the range of [M ⁇ 0.125] or more and M or less, and more preferably [M ⁇ 0.069] or more and M, where M is a natural number (for example, about 5 to 9). Within the following range.
- the number of windings of the spring 4 means how many times the winding angle of the spring wire is 360 °.
- the number of turns of the spring 4 is a natural number M
- the angle at which the spring line is wound is M times 360 °
- the number of overlapping spring lines is the natural number M regardless of the circumferential position of the spring 4.
- the number K of the spring wires overlaps with the natural number M in the majority of the spring 4, but the number of the spring wires overlaps with a part of the spring 4.
- K is one less than the natural number M [M ⁇ 1] or one more than the natural number M [M + 1].
- the spring 4 has a constant diameter over the entire length in a state where no external force is applied.
- the outer diameter of the spring 4 in a state where no external force is received is larger than the inner diameter of the outer rotating body 2 at the pressure contact surface 2a.
- the spring 4 is accommodated in the space 9 in a state where the rear end side region 4c is reduced in diameter.
- the outer peripheral surface of the rear end side region 4 c of the spring 4 is pressed against the pressure contact surface 2 a by the self-elastic restoring force in the diameter expansion direction of the spring 4.
- the front end of the spring 4 is in contact with the contact surface 3e in a state where the diameter is slightly expanded. That is, in a state where the pulley structure 1 is stopped, the inner peripheral surface of the front end side region 4b of the spring 4 is pressed against the contact surface 3e.
- the front end side region 4b is a region of one or more rounds (360 ° or more around the rotation axis) from the front end 4a of the spring 4.
- the front end side region 4b is a region whose upper limit is about two turns from the front end 4a of the spring 4.
- the diameter of the spring 4 is substantially constant over the entire length.
- the outer peripheral surface of the rear end side region 4c of the spring 4 is pressed against the pressure contact surface 2a, and the inner peripheral surface of the front end side region 4b of the spring 4 is pressed against the contact surface 3e.
- the posture of the spring 4 in a state compressed in the direction can be stabilized.
- the spring 4 is compressed in the axial direction in a state where no external force is applied to the pulley structure 1 (that is, in a state in which the pulley structure 1 is stopped), and the axial end surface of the front end side region 4b of the spring 4 (
- a part in the circumferential direction referred to as “front end surface 4 e” (range from the front end 4 a to a half or more and less than one round) contacts the groove bottom surface 3 d of the inner rotator 3, and the axial direction of the rear end side region 4 c of the spring 4
- a part of the end surface (hereinafter referred to as “rear end surface 4 f”) in the circumferential direction (range from the rear end 4 g to about 1 ⁇ 4 circuit) is in contact with the front surface 2 c 1 of the protrusion 2 c of the outer rotator 2.
- the compression rate in the axial direction of the spring 4 is, for example, about 20%.
- the axial compression ratio of the spring 4 is the difference between the natural length of the spring 4 and the axial length of the spring 4 when no external force is applied to the pulley structure 1, and the natural length of the spring 4. Is the ratio.
- a seating surface is formed on the front end surface 4e and the rear end surface 4f of the spring 4.
- the ground surface is a plane that is formed by grinding and is orthogonal to the axial direction of the spring 4.
- Each of the front end face 4e and the rear end face 4f is formed in a range of about 1/4 turn (90 °) in the circumferential direction from the ends 4a and 4g of the spring 4. In this way, by forming the back surface on the front end surface 4e and the rear end surface 4f of the spring 4, the posture of the spring 4 compressed in the axial direction can be stabilized.
- the groove bottom surface 3 d is formed in a spiral shape so as to be in contact with the front end surface 4 e of the spring 4.
- the groove bottom surface 3d of the support groove portion 3c and the front end surface 4e of the spring 4 are apparently in contact with each other in the circumferential direction, but in reality, a gap is generated in a part in the circumferential direction due to processing tolerance of parts.
- the gap is a dimension (nominal dimension) that takes into account the machining tolerance of the part (for example, the aim of the axial gap) Value 0.35 mm).
- position of the spring 4 compressed in the axial direction between the outer rotating body 2 and the inner rotating body 3 can be stabilized by forming the groove bottom surface 3d on the spiral surface. Further, by forming the groove bottom surface 3d in a spiral surface, the center axis of the spring 4 is eccentric or inclined with respect to the rotation axes of both rotating bodies due to external factors such as vibration, and the posture of the spring 4 is unstable. Can be suppressed.
- the front surface 2c1 of the projecting portion 2c slides with the rear end surface 4f of the spring 4 as will be described later, and thus is not a spiral surface but a flat surface.
- the second region 4b2 is located near the position 90 ° away from the front end 4a of the spring 4 around the rotation axis, and the portion closer to the front end 4a than the second region 4b2 is first.
- the region 4b1 and the remaining part are referred to as a third region 4b3.
- a region between the front end side region 4b and the rear end side region 4c of the spring 4 that is, a region that does not contact any of the pressure contact surface 2a and the contact surface 3e is defined as a free portion 4d.
- a contact surface 3 f that faces the front end 4 a of the spring 4 in the circumferential direction of the inner rotator 3 is formed at the front end portion of the inner rotator 3.
- a projection 3g is provided on the inner peripheral surface of the outer cylindrical portion 3b so as to protrude radially inward of the outer cylindrical portion 3b and face the outer peripheral surface of the front end side region 4b.
- the protrusion 3g faces the second region 4b2.
- the outer rotator 2 rotates relative to the inner rotator 3 in the forward direction (the arrow direction in FIGS. 2 and 3).
- the rear end side region 4 c of the spring 4 moves together with the pressure contact surface 2 a and rotates relative to the inner rotating body 3.
- the spring 4 is torsionally deformed (hereinafter referred to as “expanded deformation”) in the diameter expansion direction.
- the pressure contact force of the rear end side region 4c of the spring 4 with respect to the pressure contact surface 2a increases as the twist angle in the diameter expansion direction of the spring 4 increases.
- the second region 4b2 is most susceptible to torsional stress, and is separated from the contact surface 3e when the torsion angle in the diameter expansion direction of the spring 4 is increased. At this time, the first region 4b1 and the third region 4b3 are in pressure contact with the contact surface 3e. When the second region 4b2 moves away from the contact surface 3e, the outer peripheral surface of the second region 4b2 comes into contact with the protrusion 3g substantially simultaneously or when the torsion angle in the diameter increasing direction of the spring 4 is further increased.
- the outer peripheral surface of the second region 4b2 abuts against the projection 3g, so that the diameter expansion deformation of the front end side region 4b is restricted, and the torsional stress is distributed to portions other than the front end side region 4b in the spring 4,
- the torsional stress acting on the end side region 4c increases. Thereby, the difference in torsional stress acting on each part of the spring 4 is reduced, and strain energy can be absorbed by the spring 4 as a whole, so that local fatigue failure of the spring 4 can be prevented.
- the pressure contact force of the third region 4b3 with respect to the contact surface 3e decreases as the torsion angle in the diameter expansion direction of the spring 4 increases.
- the pressure contact force with respect to the contact surface 3e of the third region 4b3 becomes substantially zero.
- the spring 4 is not bent (bent) near the boundary between the third region 4b3 and the second region 4b2, and the front end side region 4b is maintained in an arc shape. That is, the front end side region 4b is maintained in a shape that is easy to slide with respect to the protrusion 3g. Therefore, when the torsional angle of the spring 4 in the diameter increasing direction is increased and the torsional stress acting on the front end region 4b is increased, the front end region 4b is pressed against the protrusion 3g of the second region 4b2 and the first region 4b1.
- the outer rotating body 2 slides in the circumferential direction against the protrusion 3g and the contact surface 3e against the pressing force against the contact surface 3e.
- the front end 4a of the spring 4 presses the contact surface 3f, so that torque can be reliably transmitted between the outer rotator 2 and the inner rotator 3.
- the third region 4b3 is separated from the contact surface 3e and is formed on the inner peripheral surface of the outer cylindrical portion 3b.
- the second region 4b2 is not in contact with the protrusion 3g. Therefore, in this case, the effective number of turns of the spring 4 is large and the spring constant (inclination of the straight line shown in FIG. 4) is small as compared with the case where the twist angle in the diameter expansion direction of the spring 4 is less than ⁇ 1.
- the outer rotating body 2 rotates relative to the inner rotating body 3 in the reverse direction (the direction opposite to the arrow direction in FIGS. 2 and 3).
- the rear end side region 4 c of the spring 4 moves together with the pressure contact surface 2 a and rotates relative to the inner rotating body 3.
- the spring 4 is torsionally deformed in the diameter reducing direction (hereinafter referred to as “diameter deformation”).
- the pressure contact force with respect to the pressure contact surface 2a of the rear end side region 4c is slightly lower than that in the case where the torsion angle is zero.
- the rear end side region 4c is in pressure contact with the pressure contact surface 2a. Further, the pressure contact force of the front end side region 4b with respect to the contact surface 3e is slightly increased as compared with the case where the twist angle is zero. When the torsion angle in the diameter reducing direction of the spring 4 is ⁇ 3 or more, the pressure contact force of the rear end side region 4c with respect to the pressure contact surface 2a is substantially zero, and the rear end side region 4c is Slide in the direction. Therefore, torque is not transmitted between the outer rotator 2 and the inner rotator 3 (see FIG. 5).
- the torque Ts is preferably set to a torque that causes a slight diameter deformation (a diameter deformation greater than the torsion angle ⁇ 3) in the spring 4 rather than being set to zero.
- the slip torque Ts is preferably set to be 1 N ⁇ m or more and 10 N ⁇ m or less (for example, about 3 N ⁇ m).
- the clutch disengagement is limited to a specific driving travel pattern in which the rotational speed of the outer rotator 2 is smaller than the rotational speed of the inner rotator 3. It becomes like this.
- the driving traveling pattern is such that the rotational speed of the outer rotating body 2 temporarily increases greatly and then decreases.
- torque is transmitted from the outer rotator 2 to the inner rotator 3 so that the rotational speed of the inner rotator 3 increases.
- the outer rotator 2 becomes slower than the inner rotator 3, and at this time, the clutch is disengaged.
- the slip torque Ts is set to zero.
- the disengagement of the clutch is not limited to a specific driving traveling pattern (for example, when the engine is started). Therefore, the frequency with which the pressure contact surface 2a (clutch engagement portion) and the spring 4 slide (slip) increases.
- the slip torque Ts is set so as to be limited to a specific driving travel pattern, the frequency of sliding between the pressure contact surface 2a and the spring 4 decreases, and the pressure contact surface 2a. The wear of the portion sliding with the spring 4 can be suppressed.
- the clutch disengagement is not limited to a specific driving travel pattern (for example, when the engine is started). If the slip torque Ts exceeds 10 N ⁇ m, the clutch may not be disengaged when the engine is started. If the clutch is not disengaged when the engine is started, the belt B wound around the outer rotating body 2 cannot be prevented from slipping, and in the worst case, the belt B may be detached from the outer rotating body 2.
- the amount by which the rear end side region 4c of the spring 4 is reduced in diameter pressure contact with the clutch engaging surface. Force
- the torque Ts is set to a torsional torque that causes the spring 4 to be slightly reduced in diameter.
- the spring 4 is a coil spring type clutch and functions as a one-way clutch that transmits or blocks torque in one direction.
- the spring 4 engages with each of the outer rotator 2 and the inner rotator 3, and the outer rotator 2 and the inner rotator 3. Torque is transmitted to and from.
- the spring 4 slides with respect to the pressure contact surface 2 a to generate torque between the outer rotator 2 and the inner rotator 3. Do not communicate.
- the coil spring 4B is a coil spring having a slightly smaller number of turns than the natural number M.
- the coil spring 4C is a coil spring having a slightly larger number of turns than the natural number M. 6A to 6C, the left diagram is a view of the coil spring 4 as viewed from the front, and the right diagram is a diagram of the coil spring 4 as viewed from the side.
- the number K of overlapping spring wires is the same M regardless of the position in the circumferential direction. Therefore, the coil spring 4A has a uniform compression rigidity regardless of the position in the circumferential direction, and the posture of the coil spring 4A in a compression load state is stable. Thereby, the moment of the force which inclines the coil spring 4A in one direction hardly acts on the part which contacts the press-contact surface 2a (clutch engagement part) of the coil spring 4A. As a result, the surface pressure applied to the pressure contact surface 2a from the coil spring 4A does not concentrate on a part, and there is almost no possibility that abnormal wear occurs on the pressure contact surface 2a.
- the number K of overlapping spring lines is [M ⁇ 1] in a part of the circumferential direction, and the number K of overlapping spring lines is M in other parts.
- the coil spring 4B has a larger variation in compression rigidity depending on the position in the circumferential direction than the coil spring 4A.
- the region where the number K of overlapping spring wires is small is relatively narrow (in the case of 45 ° or less)
- the portion where the number K of overlapping spring wires is large is wide, and this portion is the groove bottom surface 3d. And since it acts so that it may stretch with respect to the protrusion part 2c, the attitude
- the moment of force that tends to tilt the coil spring 4B in one direction is unlikely to act on the portion of the coil spring 4B that contacts the pressure contact surface 2a.
- the surface pressure applied to the pressure contact surface 2a from the coil spring 4B is less likely to concentrate on a part, and abnormal wear is unlikely to occur on the pressure contact surface 2a.
- the number K of overlapping spring lines is [M + 1] in a part of the circumferential direction, and the number K of overlapping spring lines is M in other parts.
- the portion having a large number K of overlapping spring wires acts so as to stretch against the groove bottom surface 3d and the protruding portion 2c in a compression load state. For this reason, a moment of force for inclining the coil spring 4C in one direction acts on a portion of the coil spring 4C that contacts the pressure contact surface 2a.
- the surface pressure applied to the pressure contact surface 2a from the coil spring 4C is concentrated on a part, and abnormal wear may occur on a part of the pressure contact surface 2a.
- Example 1 The pulley structure of Example 1 has the same configuration as that of the pulley structure 1 of the above-described embodiment, and the spring wire of the coil spring (4) is a spring oil temper wire (based on JIS G3560: 1994).
- the spring wire was a trapezoidal wire, the inner diameter side axial length was 3.8 mm, the outer diameter side axial length was 3.6 mm, and the radial length was 5.0 mm.
- the axial compression ratio of the coil spring (4) was about 20%.
- the gap between the spring lines adjacent in the axial direction was 0.3 mm.
- the strand fall of the coil spring was 0.7 degree. That is, the outer diameter side portion (outer diameter side surface) in the cross section of the spring wire is inclined by 0.7 ° with respect to the outer diameter reference line parallel to the central axis of the coil spring.
- Examples 2 to 8 The pulley structures of Examples 2 to 8 have the same configuration as the pulley structure of Example 1 except for the number of turns of the coil spring.
- the pulley structures of Comparative Examples 1 and 2 have the same configuration as the pulley structure of Example 1 except for the coil spring.
- the coil spring of Comparative Example 1 has a larger number of turns than the coil spring of Example 1 by a length of 5 °.
- the number of turns of the coil spring of Comparative Example 1 is 7.014.
- the coil spring of the comparative example 2 shall have a small number of windings by the length of 50 degree with respect to the coil spring of Example 1.
- FIG. As a result, the number of turns of the coil spring of Comparative Example 2 is 6.861 turns.
- the natural length of the coil spring also increases / decreases as the number of turns of the coil spring increases / decreases. For this reason, the axial compression ratio (design value: about 20%) of the coil spring when the pulley structure is stopped is slightly different between the specimens. It is not something that gives a level.
- the pulley structures of Examples 1 to 8 and Comparative Examples 1 and 2 were subjected to an abrasion resistance test using an engine bench tester 200 shown in FIGS. 7 (a) and 7 (b).
- the engine bench test machine 200 is a test apparatus including an auxiliary drive system, a crank pulley 201 attached to a crankshaft 211 of an engine 210, an AC pulley 202 connected to an air conditioner / compressor (AC), a water pump. And a WP pulley 203 connected to (WP).
- the pulley structures 100 of Examples 1 to 8 and Comparative Examples 1 and 2 are connected to a shaft 221 of an alternator (ALT) 220.
- An auto tensioner (A / T) 204 is provided between the belt spans of the crank pulley 201 and the pulley structure 100.
- the engine output is transmitted to the pulley structure 100, the WP pulley 203, and the AC pulley 202 from the crank pulley 201 via one belt (V-ribbed belt) 250 in a clockwise direction. Alternators, water pumps, air conditioners and compressors) are driven.
- FIG. 7B illustration of the pulleys 202, 203, and 204 is omitted, and the connection between the pulley structure 100 and the crank pulley 201 via the belt 250 is shown.
- the engine was started and stopped alternately. When the number of engine starts reached 500,000 times corresponding to the actual vehicle life, the test was terminated.
- the engine operating time (time from start to stop) was set to 10 seconds.
- the ambient temperature is a temperature that assumes the temperature in the thermostatic chamber surrounding the alternator, the pulley structure, and the crank pulley in the actual vehicle.
- the number of rotations of the crankshaft at each engine start varied between 0 and 1800 rpm.
- the coil spring alternately repeats engagement and sliding with respect to the pressure contact surface (2a) (hereinafter referred to as “clutch engagement portion”) of the outer rotating body (2).
- the pulley structure 100 was disassembled, and the maximum wear depth of the clutch engaging portion (pressure contact surface) was measured.
- the results are shown in Table 1 below and FIG.
- the evaluation was x (failed).
- the maximum wear depth of the clutch engaging portion (pressure contact surface) was 0.15 mm or less and exceeded 0.075 mm, it was evaluated as “good” (pass) as a problem-free level that could withstand practical use.
- the maximum wear depth of the clutch engaging part (pressure contact surface) is 0.075 mm or less (pass / fail judgment level of 0.15 mm or less), it is evaluated as a problem-free level that can withstand sufficient margin for practical use. It was.
- the number of turns of the coil spring is set to [M ⁇ 0.125] or more and It was found that it is preferable to be within the range of M or less (evaluation A to B). Furthermore, it has been found that the number of turns of the coil spring is more preferably in the range of [M ⁇ 0.069] or more and M or less (evaluation ⁇ ).
- the pulley structure is configured such that the outer rotating body 2 includes the pressure contact surface 2a as the clutch engaging portion, but is not limited thereto.
- the pulley structure may include a clutch engaging portion in which the inner rotating body 3 slides with the spring 4.
- the spring 4 is configured to be in the disengaged state when it is torsionally deformed in the reduced diameter direction, but is not limited thereto.
- the coil spring When the coil spring is torsionally deformed in the diameter expansion direction, it may be configured to be in a disengaged state by sliding with the outer rotating body or the inner rotating body.
Abstract
Description
実施例1のプーリ構造体は、上記実施形態のプーリ構造体1と同様の構成であって、コイルばね(4)のばね線は、ばね用オイルテンパー線(JISG3560:1994に準拠)とした。ばね線は、台形線であって、内径側軸方向長さは、3.8mmとし、外径側軸方向長さは、3.6mmとし、径方向長さは、5.0mmとした。コイルばね(4)の巻き数は7巻き(M=7)とし、巻き方向は左巻きとした。コイルばね(4)の軸方向の圧縮率は、約20%とした。軸方向に隣り合うばね線間の隙間は、0.3mmとした。また、コイルばねの素線倒れは、0.7°であった。つまり、ばね線の断面における外径側部分(外径側の面)が、ばね線の断面コイルばねの中心軸線に平行な外径基準線に対して、0.7°傾斜していた。
実施例2~8のプーリ構造体は、コイルばねの巻き数以外、実施例1のプーリ構造体と同じ構成とした。第2~第8実施例のコイルばね(4)は、それぞれ、実施例1のコイルばねに対して、5°、10°、20°、25°、30°、40°、45°分の長さだけ巻き数の少ないものとした。これにより、例えば、実施例1のコイルばねに対して、45°分の長さだけ巻き数の少ない実施例8のコイルばね(4)の巻き数が6.875(=7-0.125)巻きとなり、25°分の長さだけ巻き数の少ない実施例5のコイルばね(4)の巻き数が6.931(=7-0.069)巻きとなる。
比較例1、2のプーリ構造体は、コイルばね以外、実施例1のプーリ構造体と同じ構成とした。比較例1のコイルばねは、実施例1のコイルばねに対して5°分の長さだけ巻き数の多いものとした。これにより、比較例1のコイルばねの巻き数は、7.014巻となる。また、比較例2のコイルばねは、実施例1のコイルばねに対して50°分の長さだけ巻き数の少ないものとした。これにより、比較例2のコイルばねの巻き数は6.861巻となる。
実施例1~8及び比較例1、2のプーリ構造体について、図7の(a)、(b)に示すエンジンベンチ試験機200を用いて、耐摩耗性試験を行った。エンジンベンチ試験機200は、補機駆動システムを含む試験装置であって、エンジン210のクランク軸211に取り付けられたクランクプーリ201と、エアコン・コンプレッサ(AC)に接続されたACプーリ202、ウォーターポンプ(WP)に接続されたWPプーリ203とを有する。実施例1~8及び比較例1、2のプーリ構造体100は、オルタネータ(ALT)220の軸221に接続される。また、クランクプーリ201とプーリ構造体100とのベルトスパン間に、オートテンショナ(A/T)204が設けられる。エンジンの出力は、1本のベルト(Vリブドベルト)250を介して、クランクプーリ201から時計回りに、プーリ構造体100、WPプーリ203、ACプーリ202に対してそれぞれ伝達されて、各補機(オルタネータ、ウォーターポンプ、エアコン・コンプレッサ)は駆動される。なお、図7の(b)では、プーリ202、203、204の図示を省略して、ベルト250を介したプーリ構造体100とクランクプーリ201との接続を示している。
本出願は、2017年4月19日出願の日本特許出願2017-082495、及び2018年4月2日出願の日本特許出願2018-070956に基づくものであり、その内容はここに参照として取り込まれる。
2 外回転体
2a 圧接面
3 内回転体
4 コイルばね
Claims (3)
- ベルトが巻き掛けられる筒状の外回転体と、
前記外回転体の径方向内側に設けられ、前記外回転体と同一の回転軸を中心として前記外回転体に対して相対回転可能な内回転体と、
前記外回転体と前記内回転体との間に設けられ、前記回転軸に沿った軸方向に圧縮されているコイルばねと、を備え、
前記コイルばねは、拡径又は縮径方向にねじり変形することによって、前記外回転体及び前記内回転体と係合して、前記外回転体と前記内回転体との間でトルクを伝達し、トルクの伝達時と反対方向にねじり変形することによって、前記外回転体又は前記内回転体と摺動する係合解除状態となって、前記外回転体と前記内回転体との間でのトルクの伝達を遮断するように構成され、
前記コイルばねの巻き数は、Mを自然数として、[M-0.125]以上且つM以下の範囲内である、プーリ構造体。 - 前記コイルばねの巻き数は、[M-0.069]以上且つM以下の範囲内である、請求項1に記載のプーリ構造体。
- 前記コイルばねが前記係合解除状態となるときの前記コイルばねのねじりトルクは、1N・m以上10N・m以下に設定されている、請求項1又は2に記載のプーリ構造体。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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EP18787141.3A EP3614021A4 (en) | 2017-04-19 | 2018-04-17 | PULLEY STRUCTURE |
US16/603,304 US11668386B2 (en) | 2017-04-19 | 2018-04-17 | Pulley structure |
BR112019021827A BR112019021827A2 (pt) | 2017-04-19 | 2018-04-17 | estrutura de polias |
CA3055911A CA3055911C (en) | 2017-04-19 | 2018-04-17 | Pulley structure |
CN201880024267.0A CN110494677B (zh) | 2017-04-19 | 2018-04-17 | 带轮结构体 |
MYPI2019005809A MY197447A (en) | 2017-04-19 | 2018-04-17 | Pulley structure |
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JP2017082495 | 2017-04-19 | ||
JP2017-082495 | 2017-04-19 | ||
JP2018070956A JP6908552B2 (ja) | 2017-04-19 | 2018-04-02 | プーリ構造体 |
JP2018-070956 | 2018-04-02 |
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WO2018194075A1 true WO2018194075A1 (ja) | 2018-10-25 |
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PCT/JP2018/015921 WO2018194075A1 (ja) | 2017-04-19 | 2018-04-17 | プーリ構造体 |
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Cited By (1)
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US11448304B2 (en) | 2016-04-28 | 2022-09-20 | Mitsuboshi Belting Ltd. | Pulley structure |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014114947A (ja) | 2012-06-20 | 2014-06-26 | Mitsuboshi Belting Ltd | プーリ構造体 |
JP2017082495A (ja) | 2015-10-28 | 2017-05-18 | 首都高メンテナンス西東京株式会社 | 内照式ロードコーン用led装置 |
JP2018070956A (ja) | 2016-10-31 | 2018-05-10 | コニカミノルタ株式会社 | 高アスペクト比構造物の製造方法、超音波プローブの製造方法、高アスペクト比構造物、および、x線撮像装置 |
-
2018
- 2018-04-17 WO PCT/JP2018/015921 patent/WO2018194075A1/ja unknown
- 2018-04-17 MY MYPI2019005809A patent/MY197447A/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2014114947A (ja) | 2012-06-20 | 2014-06-26 | Mitsuboshi Belting Ltd | プーリ構造体 |
JP2017082495A (ja) | 2015-10-28 | 2017-05-18 | 首都高メンテナンス西東京株式会社 | 内照式ロードコーン用led装置 |
JP2018070956A (ja) | 2016-10-31 | 2018-05-10 | コニカミノルタ株式会社 | 高アスペクト比構造物の製造方法、超音波プローブの製造方法、高アスペクト比構造物、および、x線撮像装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11448304B2 (en) | 2016-04-28 | 2022-09-20 | Mitsuboshi Belting Ltd. | Pulley structure |
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