JP2013139861A - Damper pulley and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damper pulley which can be inexpensively manufactured by improving a yield rate of materials of a sensor member, and to provide a method for manufacturing the damper pulley.SOLUTION: A sensor member 40 for a rotation angle detection which is attached to a hub 10 or a pulley body 20 includes: a base end 41 which is formed in a circular or C-shaped axis perpendicular cross-sectional shape, and attached to the hub 10 or the pulley body 20; and a plurality of recesses 42 for detection which extend from an axial one end of the base end 41 in an axial direction and are provided to have mutual gaps in a circumferential direction of the base end 41.

Description

  The present invention relates to a damper pulley and a manufacturing method thereof.

  For example, Japanese Unexamined Patent Publication No. 2007-278417 (Patent Document 1) describes a structure in which a sensor member is attached to a damper pulley attached to a crankshaft or the like. This sensor member is used for detecting the rotation angle of the crankshaft by a magnetic sensor or the like, for example. The sensor member includes an annular plate-like member, and detected protrusions protruding outward in the radial direction are formed at regular intervals in the circumferential direction on the outer peripheral edge thereof.

JP 2007-278417 A

Generally, the sensor member having such a shape is formed by punching and pressing a flat plate as a material. Such a manufacturing method has a problem that the yield is low and the product cost is high.
An object of this invention is to provide the damper pulley which can be made cheap by making the yield of the material of a sensor member high, and its manufacturing method.

(Damper pulley)
(1) A damper pulley according to the present invention includes a hub, an annularly formed pulley main body disposed radially outward of the hub, an outer peripheral surface of the hub, and an inner peripheral surface of the pulley main body. An elastic body that is elastically coupled, and a rotation angle detection sensor member that is attached to the hub or the pulley body, wherein the sensor member is formed in an annular or C-shaped cross-sectional direction perpendicular to the axis, A base end portion to be mounted on the hub or the pulley main body, and extending in the axial direction from one axial end side of the base end portion and provided with a gap in the circumferential direction of the base end portion A plurality of detection convex portions.

(Aspect 2) The axial length of the detection convex portion may be longer than the radial thickness of the detection convex portion.
(Claim 3) Further, the sensor member has a connecting end formed in an annular or C-shaped cross section in the direction perpendicular to the axis, connecting one end in the axial direction of the convex portions for detection adjacent in the circumferential direction. You may make it prepare.

(Damper pulley manufacturing method)
(4) In the damper pulley manufacturing method according to the present invention, the damper pulley includes a hub, an annularly formed pulley body disposed radially outward of the hub, an outer peripheral surface of the hub, and the pulley body. An elastic body that elastically connects the inner peripheral surface of the sensor and a sensor member for detecting a rotation angle attached to the hub or the pulley body, and the sensor member has an annular or C-shaped axis orthogonal direction. A base end portion that is formed in a cross-sectional shape and is attached to the hub or the pulley body, and extends in the axial direction from one axial end side of the base end portion, and mutually in the circumferential direction of the base end portion And a plurality of detection convex portions provided with gaps. The sensor member performs a punching process on the belt-shaped flat plate, thereby forming a plurality of the detection convex portions with gaps in the belt-shaped longitudinal direction, and the flat plate punching step. And a bending step in which the belt-like longitudinal direction is bent to form an annular shape or a C-shape.

  (Claim 5) Further, the sensor member has a connecting end formed in an annular or C-shaped cross section in the direction perpendicular to the axis, by connecting one end in the axial direction of the convex portions for detection adjacent in the circumferential direction. The flat plate punching step may form a plurality of detection convex portions between the adjacent through holes by punching a plurality of through holes in a longitudinal direction on a belt-shaped flat plate.

  (Claim 1) The detection convex portion of the sensor member is formed so as to extend in the axial direction from one axial end side of the base end portion of the sensor member. That is, the base end portion and the detection convex portion are located at the same radial position. A yield can be made high by comprising the shape of a sensor member in this way. For example, the sensor member can be formed by performing a bending process after punching a flat plate. Moreover, the said sensor member can be shape | molded by giving a punching process using a steel pipe as a raw material. In any case, the yield can be increased as compared with the conventional case of punching an annular shape from a flat plate.

  (Claim 2) Here, the longer the axial length of the convex for detection, the higher the accuracy in detecting the rotational angle. Then, by forming the axial length of the detection convex portion longer than the radial thickness of the detection convex portion, the rotational angle detection accuracy can be increased without reducing the yield.

  (Claim 3) The axial ends of the detection convex portions are connected by a connecting end portion, and the axial other ends of the detection convex portions are connected by a base end portion. That is, the detection convex portion does not protrude in the axial direction. Thus, since the convex part for detection does not form the corner | angular part in the external shape of a sensor member, the handleability as a damper pulley which assembled | attached the component of the sensor member and the sensor member becomes favorable.

  (Claim 4) After the punching process is performed on the belt-shaped flat plate, the yield of the sensor member can be increased by manufacturing the sensor member by bending it into an annular shape or a C-shape.

  (Claim 5) The axial ends of the detection convex portions are connected by a connecting end portion, and the axial other ends of the detection convex portions are connected by a base end portion. That is, the detection convex portion does not protrude in the axial direction. Thus, since the convex part for detection does not form the corner | angular part in the external shape of a sensor member, the handleability as a damper pulley which assembled | attached the component of the sensor member and the sensor member becomes favorable.

1st embodiment: It is the figure seen from the axial direction of the damper pulley. It is II-II sectional drawing of FIG. It is radial direction sectional drawing of the sensor member which comprises the damper pulley in FIGS. 1, 2, ie, radial direction sectional drawing which shows the sensor member in the state of S3 of FIG. It is a flowchart which shows the manufacturing method of a damper pulley. It is a top view which shows the sensor member in the state of S2 of FIG. It is VI-VI sectional drawing of FIG. 2nd embodiment: It is the figure seen from the axial direction of the damper pulley. It is VIII-VIII sectional drawing of FIG.

<First embodiment>
The structure of the damper pulley of this embodiment is demonstrated with reference to FIG. 1 and FIG. The damper pulley is connected to, for example, a crankshaft (rotary shaft) of an internal combustion engine of an automobile, and is used with a V belt suspended on the outer periphery. Then, the rotational driving force of the crankshaft by the internal combustion engine is transmitted to various auxiliary machines mounted on the automobile via a V-belt, for example, an alternator, a water pump, a cooler compressor, etc., and these auxiliary machines Drive. The damper pulley can reduce or dampen vibrations in the rotational direction and attenuate the vibrations when the rotational driving force from the internal combustion engine is transmitted to the V-belt. The damper pulley includes a hub 10, a pulley body 20, an elastic body 30, and a sensor member 40.

  The hub 10 is attached to the crankshaft and rotates integrally with the crankshaft. The hub 10 is formed in the shape of a metal disk and is disposed at the central shaft portion of the damper pulley. The hub 10 includes an inner cylinder part 11, an outer cylinder part 12, and a connecting disk part 13. The inner cylinder portion 11 is fitted with a crankshaft. A key groove 11 a into which a key member for restricting relative rotation with respect to the crankshaft is fitted is formed on the inner peripheral surface of the inner cylindrical portion 11.

  The outer cylinder portion 12 is coaxially disposed outward in the radial direction of the inner cylinder portion 11. On the inner peripheral surface of the outer cylindrical portion 12, one key portion 12a protruding radially inward in the circumferential direction is formed. The connection disk part 13 connects the axial direction one end side of the inner side cylinder part 11, and the axial direction center part of the outer side cylinder part 12 in radial direction. A plurality of through holes 13 a are formed in the connecting disk portion 13 in the circumferential direction.

  The pulley body 20 is formed in a metal ring having a larger diameter than the hub 10. The pulley body 20 includes a V groove portion 21 and a shoulder portion 22. As shown in FIG. 2, a plurality of V grooves on which a V belt (not shown) is suspended are formed on the outer peripheral surface of the V groove portion 21 in the axial direction. The shoulder portion 22 is integrally formed on one axial direction of the V-groove portion 21 and has a larger diameter than the outer diameter of the V-groove portion 21. The outer peripheral surface of the shoulder portion 22 is formed to have the same diameter in the radial direction.

  The elastic body 30 is formed in a cylindrical shape from rubber, and elastically connects the outer peripheral surface of the hub 10 and the inner peripheral surface of the pulley body 20. Specifically, the inner peripheral surface of the elastic body 30 and the outer peripheral surface of the hub 10, and the outer peripheral surface of the elastic body 30 and the inner peripheral surface of the pulley body 20 are bonded with an adhesive or fixed by press-fitting. ing. The elastic body 30 bears the spring element and the damping element of the damper, and reduces the torsional vibration of the crankshaft by transmitting the vibration of the pulley body 20 to the hub 10 that rotates together with the crankshaft.

  The sensor member 40 is a member for detecting the rotation angle of the crankshaft by a magnetic sensor 50 attached to a crankcase (not shown). The sensor member 40 is formed in a cylindrical shape having an axial slit, and is attached to the inner peripheral surface of the outer cylindrical portion 12 of the hub 10 by press fitting. A plurality of through holes 42 a are formed in the sensor member 40 in the circumferential direction. That is, the sensor member 40 includes a base end portion 41, a plurality of detection convex portions 42, and a connection end portion 43.

  The base end portion 41 is a portion that is formed in a C-shaped cross section in the direction perpendicular to the axis and is attached to the inner peripheral surface of the outer cylindrical portion 12 of the hub 10. The C-shaped opening portion of the base end portion 41 is fitted into the key portion 12a of the outer cylindrical portion 12 of the hub 10 to regulate the movement of the base end portion 41 in the circumferential direction and the diameter reduction of the base end portion 41. ing.

  The plurality of detection convex portions 42 are formed between adjacent through holes 42a by forming the plurality of through holes 42a. These detection convex portions 42 extend in the axial direction from one axial end side of the base end portion 41, and are provided with a gap therebetween in the circumferential direction of the base end portion 41. The lengths in the axial direction of these detection convex portions 42 are formed longer than the radial thickness of the detection convex portions 42. The detection convex portion 42 is positioned axially outward from the outer cylindrical portion 12 of the hub 10 and one axial end of the pulley body 20. Further, the detection convex portion 42 is not formed in the C-shaped opening portion of the base end portion 41. The interval between the portions is formed larger than the interval between the other adjacent detection convex portions 42. The connecting end 43 connects the ends in the axial direction of the detection convex portions 42 adjacent to each other in the circumferential direction, and is formed in a C-shaped cross section in the direction perpendicular to the axis.

  By configuring as described above, the hub 10 rotates integrally with the rotation of the crankshaft. The pulley body 20 and the elastic body 30 transmit the rotation of the hub 10 to the pulley body 20 while reducing torsional vibration of the crankshaft via the hub 10. As the pulley body 20 rotates, the auxiliary machines are driven via the V belt suspended in the V groove portion 21 of the pulley body 20.

  Here, the sensor member 40 is attached to the outer cylindrical portion 12 of the hub 10 by press fitting. Accordingly, the sensor member 40 rotates integrally with the hub 10. Further, the detection convex portion 42 of the sensor member 40 is located axially outward from the outer cylindrical portion 12 of the hub 10 and one axial end of the pulley body 20. The magnetic sensor 50 is fixed to the crankcase, and is located radially outward of the pulley body 20 and axially outward from one axial end of the pulley body 20. That is, the magnetic sensor 50 can detect the movement of the detection convex portion 42 in the circumferential direction. Further, the interval between the adjacent detection convex portions 42 corresponding to the C-shaped opening of the base end portion 41 is different from the interval between the other adjacent detection convex portions 42. Therefore, the rotation reference position of the sensor member 40 can be detected by the magnetic sensor 50 detecting the portion. That is, the rotation angle of the sensor member 40, that is, the rotation angle of the crankshaft can be detected by the magnetic sensor 50 and the detection convex portion 42.

  Moreover, the detection accuracy of the magnetic sensor 50 increases as the axial length of the part to be detected increases. The axial length of the detection convex portion 42 is longer than the radial thickness of the detection convex portion 42. Therefore, the detection accuracy of the rotation angle by the magnetic sensor 50 can be increased. Furthermore, a base end portion 41 and a connecting end portion 43 are provided on both axial sides of the detection convex portion 42. That is, the axial one ends of the detection convex portions 42 are connected by the connecting end portion 43, and the axial other ends of the detection convex portions 42 are connected by the base end portion 41. Therefore, the detection convex portion 42 does not protrude in either of the axial directions. Thus, since the convex part 42 for detection does not form the corner | angular part in the outer diameter of the sensor member 40, the handleability as components of the sensor member 40, and the handleability as a damper pulley which assembled | attached the sensor member 40 are provided. It becomes good.

  Next, a damper pulley manufacturing method will be described with reference mainly to the flowchart of FIG. 4 and also to FIGS. As shown in FIG. 4, first, a strip-shaped flat plate is prepared (S1, flat plate preparation step). The width of the strip-shaped flat plate corresponds to the width in the left-right direction of the sensor member 40 shown in FIG. 2, and the length of the flat plate is a length obtained by linearly developing the circumferential length of the sensor member 40 shown in FIG. It corresponds to.

  Subsequently, by punching the strip-shaped flat plate, a plurality of rectangular through holes 42a are formed in the strip-shaped longitudinal direction as shown in FIGS. 5 and 6 (S2, flat plate punching step). . That is, the plurality of detection convex portions 42 are formed with gaps (through holes 42a) in the belt-like longitudinal direction. At this time, both ends of the detection convex portion 42 in the short direction (direction orthogonal to the longitudinal direction) are continuous in the longitudinal direction of the flat plate.

  Next, the longitudinal direction of the strip of the flat plate is curved to form a C shape (S3, a bending process). In this way, a sensor member 40 having a C-shaped cross section in the direction perpendicular to the axis as shown in FIGS. 1 and 2 is formed. Here, the end portions of the flat strips in the longitudinal direction have a gap. Subsequently, the sensor member 40 is press-fitted into the inner peripheral surface of the outer cylindrical portion 12 of the hub 10 (attachment process). In this way, the damper pulley is completed.

  As described above, the sensor member 40 is formed by punching and bending the strip-shaped flat plate material. Here, the material is a belt-shaped flat plate, and the portion to be punched out is not a portion forming the outer shape of the flat plate but the through hole 42a. On the other hand, in order to form a circular outer shape from a flat plate as in the prior art, it is common to punch a material having a shape larger than the circular outer shape. In this case, the outer part and the inner part of the circular outer shape of the material become useless materials. On the other hand, according to the present embodiment, since it is possible to use a strip-shaped flat plate that does not have a useless material as a material, the yield can be very high. Therefore, the damper pulley with a sensor member can be manufactured at low cost.

  Furthermore, by applying the above manufacturing method, the axial length of the detection convex portion 42 can be formed longer than the radial thickness of the detection convex portion 42. That is, the detection accuracy of the rotation angle can be increased without reducing the yield.

<Deformation mode>
In the above embodiment, the sensor member 40 has a cylindrical shape having an axial slit, that is, a C-shaped cross-sectional shape in the direction perpendicular to the axis. In addition, the sensor member 40 may be formed in an endless annular shape. In this case, as described above, the strip-shaped flat plate is used as a raw material, and the through-holes 42a are punched out and subjected to curving, so that the strip-shaped longitudinal ends of the flat plate are abutted with each other. The butted portion may be non-joined or joined, and in the case of joining, for example, welding is performed.

  When the sensor member 40 is formed in an endless annular shape, the key portion 12a of the outer cylindrical portion 12 of the hub 10 is not provided. That is, the inner peripheral surface of the outer cylinder portion 12 has the same diameter over the entire circumference. And the sensor member 40 is press-fit in the said site | part.

  Moreover, in the above, the sensor member 40 was formed using a strip-shaped flat plate as a material. In addition, the sensor member 40 can be formed by forming a through hole 42a by a punching process using a cylindrical member such as a steel pipe as a raw material. Also in this case, the sensor member 40 can be formed without wasting the outer portion by matching the axial length of the steel pipe as the material with the axial length of the sensor member 40. Therefore, the yield can be increased. In this case, the axial slit is formed in the steel pipe as the material, so that it can be as in the above embodiment, and when the axial slit is not formed, it is as in the above deformation mode.

<Second embodiment>
The damper pulley of this embodiment is demonstrated with reference to FIG. 7 and FIG. The damper pulley of this embodiment differs in the position which attaches the sensor member 140 with respect to the damper pulley of 1st embodiment. In the following, the same components as those of the damper pulley of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The sensor member 140 is different from the sensor member 40 of the first embodiment in that the sensor member 140 is formed in an endless annular cross-sectional shape perpendicular to the axis. Other than that, although the sizes are different, the shapes are substantially the same. That is, the sensor member 140 connects the endless annular base end 141, the plurality of detection convex portions 142 extending in the axial direction from one axial end side of the base end portion 141, and the detection convex portions 142. Connecting end portion 143.

  The sensor member 140 is attached to the outer peripheral surface of the shoulder portion 22 of the pulley body 20 by press-fitting. Specifically, at least the base end portion 141 is attached to the outer peripheral surface of the shoulder portion 22 by press fitting. However, in FIG. 8, both the base end portion 141 and the connecting end portion 143 are press-fitted into the outer peripheral surface of the shoulder portion 22. Here, when the sensor member 140 is attached to the shoulder portion 22 by press fitting, the sensor member 140 is preferably an endless ring. This is because the sensor member 140 can be maintained attached to the shoulder 22 by doing so.

  The sensor member 140 can be manufactured in the same manner as the sensor member 40 of the first embodiment. That is, the sensor member 140 can be manufactured using a strip-shaped flat plate as a raw material, and the sensor member 140 can also be manufactured using a cylindrical member such as a steel pipe as a raw material. Therefore, the yield can be increased. Furthermore, according to this embodiment, there exists another effect in 1st embodiment.

10: Hub, 20: Pulley body, 21: V groove part, 22: Shoulder part, 30: Elastic body, 40: Sensor member, 41: Base end part, 42: Detection convex part, 42a: Through-hole, 43: Connection End part 50: Magnetic sensor 140: Sensor member 141: Base end part 142: Convex part for detection 143: Connection end part

Claims (5)

A hub,
A pulley body formed in an annular shape and disposed radially outward of the hub;
An elastic body that elastically connects the outer peripheral surface of the hub and the inner peripheral surface of the pulley body;
A sensor member for detecting a rotation angle attached to the hub or the pulley body;
With
The sensor member is
A base end portion formed in an annular or C-shaped cross section in the direction perpendicular to the axis and attached to the hub or the pulley body;
A plurality of detection convex portions extending in the axial direction from one axial end side of the base end portion and provided with a gap in the circumferential direction of the base end portion;
A damper pulley.   The damper pulley according to claim 1, wherein an axial length of the detection convex portion is longer than a radial thickness of the detection convex portion.   The said sensor member is connected with the axial direction one end of the said convex part for a detection adjacent to the circumferential direction, and is provided with the connection end part formed in a cyclic | annular or C-shaped axial orthogonal cross section. Damper pulley. A damper pulley manufacturing method comprising:
The damper pulley is
A hub,
A pulley body formed in an annular shape and disposed radially outward of the hub;
An elastic body that elastically connects the outer peripheral surface of the hub and the inner peripheral surface of the pulley body;
A sensor member for detecting a rotation angle attached to the hub or the pulley body;
With
The sensor member is
A base end portion formed in an annular or C-shaped cross section in the direction perpendicular to the axis and attached to the hub or the pulley body;
A plurality of detection convex portions extending in the axial direction from one axial end side of the base end portion and provided with a gap in the circumferential direction of the base end portion;
With
The sensor member is
A flat plate punching step of forming a plurality of the detection convex portions with gaps in the longitudinal direction of the belt by punching the belt-shaped flat plate,
After the flat plate punching step, a bending step of bending the longitudinal direction of the belt to form an annular shape or a C-shape;
A method for manufacturing a damper pulley. The sensor member includes axial ends of the detection convex portions adjacent to each other in the circumferential direction, and includes a connection end portion that is formed in an annular or C-shaped cross-sectional direction perpendicular to the axis.
The manufacturing of the damper pulley according to claim 4, wherein the flat plate punching step forms a plurality of the detection convex portions between the adjacent through holes by punching a plurality of through holes in a longitudinal direction on a belt-shaped flat plate. Method.

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