JP6608231B2 - Meander control pulley mounting structure - Google Patents

Description

  The present invention relates to a meandering control pulley mounting structure in which a meandering control pulley is attached to a mounting member.

  In Patent Document 1, a pulley body around which a transmission belt wound around a drive pulley and a driven pulley is wound, and the pulley body are supported so as to be rotatable around a rotation axis and swingable around a pivot axis. A pulley shaft, and the pivot shaft houses a meandering control pulley tilted at a predetermined inclination angle to the front side in the rotational direction of the pulley body with respect to the axial load direction when viewed along the pulley shaft direction. A meandering control pulley mounting structure mounted on a mounting member such as the above is disclosed.

Japanese Patent No. 4373739

  By the way, in order to effectively exhibit the meandering control function by the meandering control pulley as in Patent Document 1, the tilt state of the pivot with respect to the axial load direction, that is, the tilt angle is extremely important.

  Therefore, the meandering control pulley is sold to the user with the tension-applying spring attached, and when the user attaches the spring at a predetermined attachment position, the tilt angle of the pivot axis of the meandering control pulley automatically becomes a desired angle. It is possible to do so.

  However, when the meandering control pulley is sold alone without attaching a spring, the user actually wraps the transmission belt around the pulley body of the meandering control pulley, measures its contact angle, and based on this, the shaft After specifying the direction of the load, it is necessary to fix the pulley shaft so that the pivot shaft tilts at a desired angle with respect to this direction, which takes time and effort. Further, the tilt angle of the pivot does not become a desired angle due to a measurement error, and there is a possibility that the meandering control ability and durability of the meandering control pulley may be reduced.

  The present invention has been made in view of the above points, and an object of the present invention is to facilitate the installation work of the meandering control pulley and to prevent the meandering control ability and durability of the meandering control pulley from being lowered. It is in.

  In order to achieve the above object, the present invention is characterized in that the mounting member has a function of positioning the pulley shaft of the meandering control pulley in the circumferential direction.

  Specifically, the present invention provides a pulley body around which a transmission belt wound around a drive pulley and a driven pulley is wound, and the pulley body can be rotated around a rotation axis and can be swung around a pivot axis. And a pivot shaft tilted at a predetermined inclination angle to the front side in the rotational direction of the pulley body with respect to the axial load direction when viewed along the pulley shaft direction. For the meandering control pulley mounting structure in which the pulley is mounted on the mounting member, the following solution was taken.

That is, in the first invention, a contacted portion is formed on the pulley shaft of the meandering control pulley,
The mounting member is provided with a contact portion for positioning the pulley shaft around an axis by contacting the contacted portion of the meandering control pulley , and the mounting member is fastened to a support. Features.

  As a result, the meandering control pulley is positioned so that the pivot is inclined at a predetermined inclination angle with respect to the direction of the axial load simply by bringing the abutted part of the meandering control pulley into contact with the abutting part of the mounting member during the mounting operation. This makes it easy to install. Further, since it is not necessary to measure the contact angle of the transmission belt and no measurement error occurs, it is possible to reliably set the tilt angle of the pivot to a desired angle, and to prevent the meander control ability and durability of the meander control pulley from being lowered.

According to a second aspect of the present invention, in the meandering control pulley mounting structure according to the first aspect, the contacted portion of the pulley shaft is a flat surface formed on the outer peripheral surface of the base end portion of the pulley shaft of the meandering control pulley. cut surface der is, the mounting member forms a longitudinal shape, and one surface of the mounting member includes a first surface and a second surface portion which is retracted back than the first surface, said first The first surface portion and the second surface portion are connected by a flat standing wall portion formed from one end edge extending in the longitudinal direction of the mounting member toward the other end edge extending in the longitudinal direction, and the standing wall portion serves as the contact portion. characterized in that it constitutes.

  As a result, the cutting surface of the pulley shaft is formed flat, and the cutting operation is facilitated as compared with the case where the pulley shaft is formed in a curved surface shape, so that the pulley shaft can be easily manufactured.

According to a third aspect of the present invention, in the meandering control pulley mounting structure according to the second aspect of the present invention , an insertion hole is formed in the second surface portion of the mounting member, and the insertion hole of the mounting member is provided with the serpentine control pulley. A bolt for fastening the pulley shaft to the mounting member is inserted .

  According to the present invention, it is possible to facilitate attachment of the meandering control pulley and to prevent the meandering control ability and durability of the meandering control pulley from being lowered.

It is a front view of the power transmission belt device to which the meander control pulley attachment structure concerning Embodiment 1 of the present invention was applied. It is a perspective view of a meandering control pulley. It is a perspective view of an arm. It is the IV section enlarged view of FIG. 1 in the use condition of a meandering control pulley. It is sectional drawing in the VV line of FIG. It is sectional drawing of the pulley axis | shaft corresponding to the VI-VI line of FIG. It is sectional drawing in VII-VII of FIG. It is a schematic perspective view around the shaft in the use state of the meandering control pulley. FIG. 5 is a view taken along arrow IX in FIG. 4 schematically showing a state in which the transmission belt is offset by using a meandering control pulley. FIG. 5 is a view taken in the direction of arrow X in FIG. 4 schematically showing a state in which the transmission belt is offset by using a meandering control pulley. FIG. 4 is a diagram corresponding to FIG. 3 of the second embodiment. FIG. 5 is a diagram corresponding to FIG. 4 of the second embodiment. FIG. 4 is a diagram corresponding to FIG. 3 of the third embodiment. FIG. 5 is a diagram corresponding to FIG. 4 of the third embodiment. FIG. 6 is a view corresponding to FIG. 3 of the fourth embodiment. FIG. 5 is a diagram corresponding to FIG. 4 of the fourth embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
1 to 7 show a transmission belt device 1 to which a meandering control pulley mounting structure according to Embodiment 1 of the present invention is applied. The transmission belt device 1 includes a drive pulley 20 and a driven pulley 30, and a transmission belt 3, which is a flat belt, is wound around the drive pulley 20 and the driven pulley 30 via a meandering control pulley 4. The power of 20 is transmitted to the driven pulley 30. The meandering control pulley 4 is attached to an arm 16 as a rectangular plate-like attachment member, and is urged by an urging means (not shown) and pressed against the transmission belt 3 to apply tension to the transmission belt 3.

  A first insertion hole 16a is formed in the vicinity of one end of the arm 16 in the longitudinal direction, while a second insertion hole 16b is formed in the vicinity of the other end of the arm 16 in the longitudinal direction. ing. Then, by inserting a bolt (not shown) into the first insertion hole 16a, the arm 16 is fastened to a support body such as a housing with its longitudinal direction oriented in the vertical direction.

  The front surface (one surface) of the arm 16 has a first surface portion 17 in which the first insertion hole 16 a is formed and a second insertion hole 16 b in which the first surface portion 17 recedes back from the first surface portion 17. The first surface portion 17 and the second surface portion 18 are connected by a standing wall portion 19 as a flat contact portion orthogonal to the surface of the arm 16. The standing wall portion 19 is formed so as to be inclined downward by an angle α with respect to the horizontal direction from the substantially central portion of one end edge extending in the longitudinal direction of the arm 16 toward the other end edge extending in the longitudinal direction of the arm 16. Yes.

  The meandering control pulley 4 has a pulley body 5 around which the transmission belt 3 is wound, a pulley body 5 that is rotatable around a rotation axis C1 via a bearing 6 and swings around a pivot C2 orthogonal to the rotation axis C1. And a pulley shaft 10 that is freely supported.

  The pulley shaft 10 includes a pair of connecting members 7, 7 attached to the inner side of the inner ring of the bearing 6, and a shaft 8 inserted into the inner ring of the bearing 6.

  The pair of connecting members 7 and 7 are formed into a flat bowl shape by, for example, a resin sliding material, and are bonded to two locations facing each other in the diametrical direction across the rotation axis C1 on the inner peripheral side of the inner ring of the bearing 6. It is fixed. The flat surfaces 7a and 7a (sliding contact surfaces) of the connecting members 7 and 7 are arranged so as to be parallel to each other, and at substantially the center thereof, the flat surfaces 7a and 7a are opposed to each other perpendicular to the flat surfaces 7a and 7a. A pair of convex portions 7b and 7b having a circular cross section projecting in this manner are formed. Further, flange portions 7c and 7c are formed at both end portions of each connecting member 7 in the direction of the rotation axis C1 so as to be in contact with both end surfaces of the inner ring of the bearing 6, respectively.

  The shaft 8 is formed in a cylindrical shape longer than the connecting member 7 by a sintered alloy of iron, and the outer peripheral surface thereof corresponds to the flat surfaces 7a and 7a of the pair of connecting members 7 and 7, respectively. And the parallel flat cut surfaces 8a and 8a which adjoin to them are formed over the full length. When the axial load L is applied by the tension of the transmission belt 3 wound around the pulley body 5, the flat surface 7a and the cut surface 8a on the side around which the transmission belt 3 is wound are thereby slidable with respect to each other. To come into contact.

Further, the gaps 12 and 12 are provided between the outer peripheral surface of the shaft 8 and the inner peripheral surface of the inner ring of the bearing 6 surrounding the shaft 8 except for the portion where the pair of connecting members 7 and 7 are disposed. Is formed. Accordingly, the pulley main body 5, the inner ring of the bearing 6, and the connecting members 7 and 7 are thereby swingable about the pivot C2.

  Furthermore, through-holes 8b and 8b having a circular cross section are formed through the cut surfaces 8a and 8a so as to be halved at portions where the shaft 8 is divided. The projecting portions 7b and 7b of the connecting members 7 and 7 are rotatably fitted in the through holes 8b and 8b, respectively. Therefore, the inner ring of the bearing 6 and the shaft 8 are rotatably connected to each other around a straight line (the pivot C2) connecting the pair of through holes 8b and 8b and the convex portions 7b and 7b. At this time, the flat surface 7a of the connecting members 7 and 7 and the cut surface 8a of the shaft 8 are slidably in contact with each other, so that the axial load L can be firmly received.

  The shaft 8 is divided into two cylindrical members 9a and 9b in the direction of the rotation axis C1, and is integrated by inserting a bolt 11 through the two divided members 9a and 9b. The proximal end portion of the shaft 8 is fastened to the arm 16 by inserting the distal end portion into the second insertion hole 16 b of the arm 16. Further, the pulley shaft 10 is positioned around the axis by the standing wall portion 19 of the arm 16 abutting against one cut surface 8 a of the base end portion of the shaft 8. Therefore, one cut surface 8a of the base end portion of the shaft 8 constitutes a contacted portion.

  Then, the meandering control pulley 4 is used in the state of use as shown in FIG. 1, with respect to the direction of the axial load L as seen along the direction of the pulley shaft 10 as schematically shown in FIG. 4. The pivot C2 is tilted by a predetermined inclination angle α to the front side in the rotational direction of the pulley body 5, that is, to the front side in the belt traveling direction indicated by an arrow R in the drawing. Thereby, when the transmission belt 3 that is wound around the pulley body 5 is shifted in the width direction, the pulley body 5 is inclined in the axial load L direction due to the shift of the axial load center due to this, and the transmission is transmitted. The belt 3 obliquely crosses the belt 3 and effectively generates a return force for returning the displacement of the transmission belt 3.

  Specifically, as shown in FIG. 8, when the transmission belt 3 is applied near the center of the width of the pulley body 5, the vector of the axial load L (shown by a solid line) intersects the pivot C2, and the component force Lo is It acts along the pivot axis C2 and acts so that the component force L1 is orthogonal to the pivot axis C2. On the other hand, although not shown, when the transmission belt 3 approaches the one side from the center of the pulley body 5, the axial load L shifts to one side and acts on the pulley body 5 and the bearing 6. In this case, a rotational moment around the pivot C2 is generated by the component force L1 of the axial load L, and thereby the pulley body 5 and the bearing 6 are rotationally displaced around the pivot C2.

  That is, if the direction of the axial load L is parallel to the pivot C2, L = Lo and L1 = 0 at this time, and no rotational moment is generated around the pivot C2, but the axial load L is not as in this embodiment. If the direction is inclined by the angle α from the direction of the pivot axis C2, a rotational moment around the pivot axis C2 is generated by the component force L1 of the axial load L, so that the pulley body 5 and the bearing 6 are rotationally displaced. Here, the angle α corresponds to the tilt angle of the pivot C2 with respect to the direction of the axial load L.

  In this embodiment, the pivot C2 is tilted forward in the rotational direction of the pulley body 5 as shown in FIG. 4 and the like, so that the pulley body 5 and the bearing 6 are driven by the component force L1 of the axial load L as described above. When the pulley body 5 is rotated around the pivot C2, the transmission belt 3 is offset in the direction of the axial load L as shown in an exaggerated manner in FIG. At the same time as the inclined side is lower and the opposite side is higher, as shown in an exaggerated manner in FIG. As shown, the transmission belt 3 is obliquely crossed. 9 and 10, the state where the pulley body 5 is rotationally displaced is indicated by a virtual line (two-dot chain line).

  Due to the rotational displacement of the pulley body 5, the transmission belt 3 is caused to return to the transmission belt 3 by a slanting state (force to return the offset) and the pulley body 5 is inclined. The return force works, thereby preventing the transmission belt 3 from being displaced. That is, the transmission belt 3 travels at a position where the return force due to the pulley body 5 being inclined and obliquely crossed with the offset force acting on the transmission belt 3 due to the characteristics of the transmission belt device 1. Thus, even if the transmission belt 3 is largely offset due to disturbance or the like, the return force and the offset force are returned to a balanced position, so that meandering and offset running are not performed.

  Note that the return force due to the crossing is more effective than the return force due to the tilt. Therefore, in order to effectively use the return force due to the crossing, the tilt angle α of the pivot C2 exceeds 0 degree and 45 °. It is preferable to set it within a range of less than or equal to 30 degrees, and more preferably less than or equal to 30 degrees.

  In order to attach the meandering control pulley 4 configured as described above to a support such as a housing, first, a bolt (not shown) is inserted into the first insertion hole 16a of the arm 16 so that the arm 16 is moved to the first insertion hole 16a. Fastened to a support such as a housing with the longitudinal direction oriented vertically. Then, the split members 9a and 9b of the shaft 8 are inserted into the inner ring of the bearing 6 from both sides in the rotational axis C1 direction, and the pair of connecting holes are respectively inserted into the pair of through holes 8b and 8b formed at the portions where they are combined. The convex portions 7b and 7b of the members 7 and 7 are inserted. Further, the shaft 8, that is, the pulley shaft 10 is positioned around the axis by bringing one cutting surface 8 a of the base end portion of the shaft 8 into contact with the standing wall portion 19 of the arm 16. Then, in this state, the bolt 11 is inserted into the two divided members 9a and 9b, and both are fastened together. At the same time, the tip of the bolt 11 is inserted into the second insertion hole 16b of the arm 16, and the shaft 8 is inserted. Fasten to arm 16. Thereby, the meandering control pulley 4 is assembled, and the shaft 8 of the meandering control pulley 4, that is, the pulley shaft 10 is attached to the arm 16.

  Therefore, according to the first embodiment, at the time of attachment work, the pivot C2 can be connected to the axial load L only by bringing one cutting surface 8a of the base end portion of the shaft 8 of the meandering control pulley 4 into contact with the standing wall portion 19 of the arm 16. Since the meandering control pulley 4 can be positioned so as to incline at a predetermined inclination angle α with respect to the direction, the mounting operation becomes easy. Further, since there is no need to measure the contact angle of the transmission belt 3 and no measurement error occurs, the tilt angle of the pivot C2 is surely set to the desired angle α to prevent the meander control ability and durability of the meander control pulley 4 from being deteriorated. it can.

  Further, since the cutting surfaces 8a and 8a of the shaft 8 are formed flat and the cutting work is facilitated compared with the case where the shaft 8 is formed in a curved surface shape, the pulley shaft 10 can be easily manufactured.

(Embodiment 2)
11 and 12 show the arm 16 of the transmission belt device 1 to which the meandering control pulley mounting structure according to the second embodiment of the present invention is applied. In the second embodiment, the arm 16 is formed with a groove portion 41 as a concave portion having a U-shaped cross section extending at an angle α with respect to the horizontal direction, and a base end portion of the shaft 8, that is, a pulley, is formed in the groove portion 41. The base end portion (one axial end portion) of the shaft 10 is fitted. Then, the upper side surface 41a and the lower side surface 41b as inner surfaces of the groove portion 41 contact the cut surfaces 8a and 8a of the base end portion of the shaft 8 to form a contact portion, and both the cut surfaces 8a and 8a. Constitutes the abutted portion.

  Since other configurations are the same as those of the first embodiment, the same components are denoted by the same reference numerals and detailed description thereof is omitted.

Therefore, according to the second embodiment, the base end portion of the shaft 8 of the meandering control pulley 4 is fitted into the groove portion 41 of the arm 16 at the time of attachment work, so that the cut surface 8a of the base end portion of the shaft 8
Since 8a can be made difficult to separate from the upper side surface 41a and the lower side surface 41b of the groove portion 41 of the arm 16, it is easy to use.

(Embodiment 3)
13 and 14 show the arm 16 of the transmission belt device 1 to which the meandering control pulley mounting structure according to the third embodiment of the present invention is applied. In the third embodiment, the arm 16 is not formed with the standing wall portion 19, and the pair of columnar projecting piece portions 42 in the vicinity of the upper side of the second insertion hole 16 b of the arm 16 is an angle α with respect to the horizontal direction. It projects integrally with an interval in the tilting direction. And the outer peripheral surface 42a of these protrusion piece parts 42 contact | abuts one cutting surface 8a of the base end part of the said shaft 8, and comprises the contact part.

  Therefore, according to the third embodiment, the same effect as in the first embodiment can be obtained.

(Embodiment 4)
15 and 16 show the arm 16 of the transmission belt device 1 to which the meandering control pulley mounting structure according to the fourth embodiment of the present invention is applied. In the fourth embodiment, the arm 16 is not provided with the standing wall portion 19, and a rectangular parallelepiped protrusion 43 is provided in the vicinity of the upper side of the second insertion hole 16 b of the arm 16, and the side surface on the second insertion hole 16 b side. 43a is integrally projected with an angle α with respect to the horizontal direction. And the side surface 43a of this protrusion part 43 contact | abuts to one cut surface 8a of the base end part of the said shaft 8, and comprises the contact part.

  Therefore, according to the fourth embodiment, the same effect as in the first embodiment can be obtained.

  In the first to fourth embodiments, the contact portion of the meandering control pulley 4 is the flat cut surface 8a and the contact portion of the arm 16 is the flat standing wall portion 19, but the contact portion is the contact portion. As long as the pulley shaft 10 can be positioned around the axis by abutting on the part, the shapes of the abutted part and the abutting part are not limited thereto.

  In Embodiments 1 to 4, the shaft 8 is made of an iron sintered alloy. However, as long as sufficient strength can be secured, the shaft 8 is made of a light metal such as aluminum or magnesium, another metal such as a steel material, or a resin. It may be configured. The shaft 8 is not limited to sintering, and may be formed by other processing methods such as cutting and die casting. The frictional force during sliding of the shaft 8 and the connecting member 7 depends on the material and surface properties of the shaft 8 and the connecting member 7. Therefore, these materials and surface properties are appropriately selected so that an appropriate frictional force can be obtained.

  The present invention is useful as a meandering control pulley mounting structure in which a meandering control pulley is attached to a mounting member.

3 Transmission belt 4 Meander control pulley 5 Pulley body 8a Cut surface (contacted portion)
10 Pulley shaft
11 bolt 16 arm (mounting member)
16b second insertion hole
17 1st surface part
18 2nd surface part 19 Standing wall part (contact part)
20 Drive pulley 30 Driven pulley 41 Groove (recess)
41a Upper side surface (contact part)
41b Lower side surface (contact part)
42a Outer peripheral surface (contact portion)
43a Side surface (contact part)
C1 Rotation axis C2 Axis L Axis load α Inclination angle

Claims (3)

A pulley body around which a transmission belt wound around a drive pulley and a driven pulley is wound; and a pulley shaft that supports the pulley body so as to be rotatable about a rotation axis and swingable about a pivot axis. The pivot shaft has a meandering control in which a meandering control pulley, which is tilted at a predetermined inclination angle to the front side in the rotational direction of the pulley body with respect to the axial load direction as viewed along the pulley axial direction, is attached to a mounting member. A pulley mounting structure,
A contact portion is formed on the pulley shaft of the meandering control pulley,
The mounting member is provided with a contact portion for positioning the pulley shaft around an axis by contacting the contacted portion of the meandering control pulley , and the mounting member is fastened to a support. A meandering control pulley mounting structure. In the meandering control pulley mounting structure according to claim 1,
Abutted portion of the pulley shaft, Ri flat cutting surface der formed on the outer peripheral surface of the proximal end portion of the pulley shaft of the meander control pulley,
The mounting member has a longitudinal shape, and one surface of the mounting member includes a first surface portion and a second surface portion that is recessed backward from the first surface portion, and the first surface portion and the second surface portion. Is connected by a flat standing wall portion formed from one end edge extending in the longitudinal direction of the mounting member toward the other end edge extending in the longitudinal direction, and the standing wall portion constitutes the contact portion. A meandering control pulley mounting structure. In the meandering control pulley mounting structure according to claim 2,
An insertion hole is formed in the second surface portion of the mounting member,
A meandering control pulley mounting structure, wherein a bolt for fastening the pulley shaft of the meandering control pulley to the mounting member is inserted into the insertion hole of the mounting member .

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