JP2017141903A - Auto Tensioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an auto tensioner which can improve workability at maintenance or the like.SOLUTION: An auto tensioner comprises: a tensioner support body 2 for supporting the auto tensioner 10 as a whole; a rotating body 3 which is supported to the tensioner support body 2 so as to be turntable with a circuit rotating shaft L1 as a center; a pulley 4 having a cylinder part 43 which is supported to the rotating body 3 so as to be turntable with a second rotating shaft L2 parallel with the first rotating shaft L1 as a center; and energization means which is interposed between the tensioner support body 2 and the rotating body 3, and energizes the rotating body 3 so as to withstand a force applied from a power transmission body via a pulley 4. When a rotation side having the rotating body 3 and the pulley 4 is located at a prescribed lock position with respect to a fixed side having the tensioner support body 2, a clearance between the fixed-side lock part 23 arranged at a proper position at the fixed side and a rotation-side lock part 33 arranged at a proper position at the rotation side is locked.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an auto tensioner.

  In a power system of an automobile or the like, power from an engine is transmitted through an endless belt or the like as a power transmission member wound between gears of a plurality of machines, and is rotated between the gears by the belt or the like. Synchronization can be achieved. At this time, in order to efficiently transmit power, it is necessary to apply sufficient tension so that the belt does not sag. On the other hand, excessive tension increases the load on the belt and shortens the life of the belt. There is a risk of becoming. For this reason, an auto tensioner is used as a component of the power system, which elastically abuts the pulley at a required position of the belt and applies a predetermined tension to the entire belt while maintaining the movement of the belt by the rotation of the pulley. Yes.

  4 and 5 show an example of a conventional auto tensioner. The auto tensioner 1 shown here is a tensioner support 2 that supports the entire auto tensioner 1, and a rotating body that is supported by the tensioner support 2 so as to be rotatable about a rotation axis (first rotation axis) L1. 3 and a pulley 4 having a rotation axis (second rotation axis) L2 parallel to the rotation axis L1 and supported by the rotating body 3 (hereinafter, parallel to the rotation axis L1 and the rotation axis L2). The direction is referred to as the tensioner axial direction).

  The pulley 4 is provided with a cylindrical portion 43 through a bearing 42 on the outer side in the radial direction of the shaft portion 41 that forms the second rotation axis L2, and the cylindrical portion 43 is attached to the belt 6 as a power transmission body. It forms a rotating surface that makes contact. The rotating body 3 includes a cover portion 31 having a cylindrical inner space, and a pulley support portion 32 integrally formed so as to project in one direction radially outside the cover portion 31. The shaft portion 41 of the pulley 4 is fixed. At least a part of the columnar portion 21 of the tensioner support 2 is inserted into the cylindrical internal space of the cover portion 31.

  The cylindrical portion 21 of the tensioner support 2 forms a first rotation axis L1, and a cylindrical bush 51 is sandwiched between the outer peripheral surface thereof and the inner peripheral surface of the cover portion 31 of the rotary body 3, and the bush 51 The rotating body 3 is supported around the cylindrical portion 21 via the. The tensioner support 2 includes a cup portion 22 at least at one end of a cylindrical portion 21, and the cup portion 22 has a bottom surface that projects radially outward from one end of the cylindrical portion 21, and a side surface that is at least a part of the cylindrical portion 21. Is formed so as to cover from the outside in the radial direction. The side surface of the cup portion 22 further covers a part of the cover portion 31 of the rotating body 3 from the outside in the radial direction, and the side surface of the cup portion 22 and the cover portion 31 overlap at least partially in this way, The part 22 and the cover part 31 form a space for accommodating the cylindrical part 21.

  The tensioner support 2 is fixed to an external machine such as an engine via a cup portion 22, and supports the entire auto tensioner 1 by the tensioner support 2. In a space formed by the outer peripheral surface of the cover portion 31 of the rotating body 3 and the inner surface of the cup portion 22 of the tensioner support body 2, a spring 52 as an urging means is interposed through a support material 53 and the cover portion of the rotating body 3. It is arranged to be wound around the outer peripheral surface of 31. The support member 53 is fixed to the bottom surface of the cup portion 22, and the spring 52 is interposed between the tensioner support 2 and the rotation body 3 so that one end contacts the tensioner support 2 and the other end contacts the rotation body 3. Be dressed.

  Thus, the auto tensioner 1 having the above-described configuration is installed so that the cylindrical portion 43 of the pulley 4 is in contact with the belt 6 as shown in FIG. 4, and the belt is formed by the rotation of the cylindrical portion 43 around the rotation axis L2. 6, while the pulley 4 itself is urged by the spring 52 (see FIG. 5) around the rotation axis L <b> 1 to rotate integrally with the rotating body 3, tension is applied to the belt 6. It is supposed to be. In the example shown in FIG. 4, the pulley 4 is movable between the position indicated by the solid line and the position indicated by the phantom line around the rotation axis L1, and is moved upward by the spring 52 (see FIG. 5). Is biased in the direction. Then, the spring 52 (see FIG. 5) is expanded in diameter according to the load applied to the pulley 4 from the upper side in the figure by the belt 6 and repels, thereby resisting the load from the belt 6.

  Incidentally, as a prior art document related to this type of auto tensioner, for example, there is the following Patent Document 1.

Japanese Patent Laying-Open No. 2015-224741

  In the power system in which the auto tensioner 1 is installed, when the belt 6 is attached, such as when the belt 6 is replaced during maintenance, the pulley 4 is first moved to the position indicated by the phantom line in FIG. When the pulley 4 is wound around and then returned to the position indicated by the solid line, tension is applied to the belt 6. At this time, the pulley 4 is moved to a position indicated by an imaginary line with a tool such as a spectacle wrench against the elastic force of the spring 52 (see FIG. 5), and the belt 6 is wound while holding the pulley 4 in this state. However, in this process, work is performed while applying a force to the tool that holds the pulley 4 with one hand, resulting in deterioration of workability. In particular, like the above-described conventional example and the auto-tensioner described in Patent Document 1 (see FIG. 5), the tensioner support 2 including the cylindrical portion 21 projects to a position near the pulley 4 in the tensioner axial direction. In the case of the auto tensioner 1, since the space around the pulley 4 is narrowed by the extension of the tensioner support 2, it is inconvenient to move tools and the like, and becomes a factor that further deteriorates workability in attaching the belt 6. It was.

  In view of such circumstances, the present invention intends to provide an auto tensioner that can improve workability in maintenance and the like.

  The present invention provides an auto tensioner that applies tension to a power transmission body wound between a plurality of gears, thereby applying tension to the power transmission body, and supports the entire auto tensioner. A tensioner support, a rotating body supported to be rotatable about the first rotation axis with respect to the tensioner support, and a second rotation axis parallel to the first rotation axis with respect to the rotation body. A pulley having a cylindrical portion rotatably supported at the center, and the rotating body interposed between the tensioner support body and the rotating body, so as to oppose a force applied from the power transmission body via the pulley. An appropriate position on the fixed side when the rotating side including the rotating body and the pulley is in a predetermined locking position with respect to the fixed side including the tensioner support. Fixed-side locking part provided for , In which according to the auto-tensioner characterized by being configured to allow the locking between the rotating side of the appropriate position on the rotating side latching portion provided.

  Thus, in this way, by locking between the fixed-side locking portion and the rotation-side locking portion at the locking position, the biasing means does not need to hold the rotation side. It is possible to prevent the urged rotating side from moving relative to the fixed side.

  In the auto tensioner according to the present invention, the tensioner support includes a cylindrical portion that forms the first rotation axis, a bottom surface that protrudes radially outward from one end of the cylindrical portion, and at least a part of the cylindrical portion that is radially outward. And the rotating body includes a cover portion having an internal space into which at least a part of the cylindrical portion is inserted, and the fixed side locking portion is a side surface of the cup portion. The rotation-side locking portion is formed so as to protrude from the side surface of the cover portion and has a hole along the tensioner axial direction. In the locking position, a rod-shaped member is passed through the hole of the fixed side locking portion and the hole of the rotation side locking portion, thereby engaging the fixed side locking portion and the rotation side locking portion. Configure to be able to stop In this way, the rotation side is locked to the fixed side by inserting or removing a rod-like member into the hole provided in the fixed side locking portion and the hole provided in the rotation side locking portion. It is possible to easily switch between a fixed state and a free state.

  According to the auto tensioner of the present invention, the following various excellent effects can be obtained.

  (I) According to the invention described in claim 1 of the present invention, the rotation side urged by the urging means is prevented from moving relative to the fixed side even if the rotation side is not particularly held at the locking position. In addition, workability in maintenance and the like can be improved.

  (II) According to the invention described in claim 2 of the present invention, since the rotation side can be easily switched between the fixed side and the free state with respect to the fixed side, work in maintenance and the like Property can be further improved.

It is a perspective view which shows an example of the form of the auto tensioner of this invention, and has shown the case where the rotation side is in a free state. It is a perspective view which shows an example of the form of the auto tensioner of this invention, and has shown the case where a rotation side exists in a latching position. It is sectional drawing which shows an example of the form of the auto tensioner of this invention, and has shown the case where the fixed side latching | locking part and the rotation side latching | locking part are latched. It is a perspective view which shows an example of the form of the conventional auto tensioner. It is sectional drawing which shows an example of the form of the conventional auto tensioner.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 3 show an example of a form of an auto tensioner according to an embodiment of the present invention. In the figure, parts denoted by the same reference numerals as those in FIGS. Is the same as the conventional auto tensioner 1 shown in FIGS.

  The auto tensioner 10 of the present embodiment includes a tensioner support 2 that supports the entire auto tensioner 10, a rotating body 3 that is supported by the tensioner support 2 so as to be rotatable about a first rotation axis L <b> 1, A pulley 4 provided with a cylindrical portion 43 that is rotatably supported around a second rotation axis L2 parallel to the rotation axis L1 with respect to the rotation body 3, and interposed between the tensioner support 2 and the rotation body 3. And a spring 52 as urging means for urging the rotating body 3 to oppose the force applied via the pulley 4 from the belt 6 (see FIG. 4) as a power transmission body. It is the same as the conventional auto tensioner 1 shown in FIGS. 4 and 5 in that it is configured to apply tension to the belt 6 by elastic contact. In the case of the auto tensioner 10 of the present embodiment, a fixed side locking portion 23 and a rotation side locking portion 33 are provided on the side surface of the cup portion 22 of the tensioner support 2 and the side surface of the cover portion 31 of the rotating body 3, respectively. The rotating side member including the pulley 4 and the rotating body 3 is in a predetermined position (hereinafter referred to as “locking position”) as shown in FIG. 2 with respect to the fixed side member including the tensioner support 2. In some cases, as shown in FIG. 3, the fixed side locking portion 23 and the rotation side locking portion 33 can be locked to each other.

  In the case of the auto tensioner 10 of the present embodiment, the fixed side locking portion 23 is configured as a flange projecting along the surface orthogonal to the tensioner axial direction on the side surface of the cup portion 22 of the tensioner support 2, and in the tensioner axial direction. A hole 24 is provided so as to penetrate the fixed side locking portion 23 along the same. Similarly, the rotation-side locking portion 33 is configured as a flange projecting on the side surface of the cover portion 31 of the rotating body 3 along a plane orthogonal to the tensioner axial direction, and the rotation-side locking portion 33 is extended along the tensioner axial direction. The hole 34 which penetrates is provided.

  When attaching the belt 6 (see FIG. 4), the pulley 4 is moved from the state shown in FIG. 1 to the locking position shown in FIG. 2 against the elastic force of the spring 52 using a spectacle wrench or the like. The rotation side member including the pulley 4 and the rotating body 3 and the tensioner by passing an appropriate rod-shaped member W through the hole 24 of the fixed side locking portion 23 and the hole 34 of the rotation side locking portion 33. As shown in FIG. 3, it can be fixed at the locking position so that the fixed member provided with the support body 2 does not move around the rotation axis L1. Once the fixed-side locking portion 23 and the rotation-side locking portion 33 are locked once at the locking position, the spring is not required to hold the rotation-side member including the pulley 4 using a spectacle wrench or the like. Since the rotating side urged by 52 does not move from the locking position, the belt 6 (see FIG. 4) can be wound using both hands, and the workability is greatly improved. After the belt 6 (see FIG. 4) is wound, if the rod-shaped member W is removed from the holes 24 and 34, the rotation side can move around the rotation axis L1 according to the load applied to the cylindrical portion 43 ( Hereinafter, it is referred to as “free state”), and the pulley 4 can be brought into contact with the belt 6 to apply tension. In addition, as the rod-shaped member W, the thing of the shape which can be penetrated to the holes 24 and 34 can be used suitably, For example, an affordable tool etc., such as a hexagon wrench, can be used.

  As described above, in this embodiment, the rod-shaped member W is inserted into or extracted from the hole 24 provided in the fixed-side locking portion 23 and the hole 34 provided in the rotation-side locking portion 33, so that On the other hand, it is possible to easily switch between a state where the rotation side is fixed at the locking position and a free state.

  In the present embodiment, as described above, the fixed side locking portion 23 is provided on the side surface of the cup portion 22 of the tensioner support 2, and the rotation side locking portion 33 is provided on the side surface of the cover portion 31 of the rotating body 3. However, the installation position of the fixed side locking portion 23 and the rotation side locking portion 33 is not limited to this position, and can be set at an appropriate position on the fixed side or the rotation side, respectively. For example, the rotation side locking portion 33 can be provided at an appropriate position of the pulley support portion 32. In short, what is necessary is just to be comprised so that a fixed side and a rotation side can be mutually fixed in a latching position.

  Further, the configuration of the fixed side locking portion 23 and the rotation side locking portion 33 itself is not limited to the above-described form. For example, both the hole 24 of the fixed side locking portion 23 and the hole 34 of the rotation side locking portion 33 do not need to penetrate the fixed side locking portion 23 or the rotation side locking portion 33. Although illustration is omitted, the same operation and effect can be obtained with either one of the configurations in which the fixed side locking portion 23 or the rotation side locking portion 33 is not penetrated. In addition, for example, although not shown, a rod-shaped member W (see FIG. 2) or a similar locking tool is provided in advance in either the hole 24 of the fixed side locking portion 23 or the hole 34 of the rotation side locking portion 33. If the locking tool is configured to move along the hole 24 or the hole 34 in the locking position and pass through the holes 24 and 34, it is possible to prepare a tool such as the tool W. The rotating side can be easily fixed at the locking position with respect to the fixed side, and the fixed state can be released to a free state. In addition, the fixed-side locking portion 23 and the rotation-side locking portion 33 can take various configurations, but in any case, the fixed-side locking portion 23 and the rotation-side locking portion 33 rotate relative to the fixed side. What is necessary is just to be comprised so that it can switch between the state which fixed the side in the latching position, and a free state.

  As described above, in this embodiment, the pulley 4 is elastically brought into contact with the power transmission body (belt) 6 wound between the plurality of gears, so that the power transmission body (belt) 6 is brought into contact with the power transmission body (belt) 6. With respect to the auto tensioner 10 that applies tension, a tensioner support 2 that supports the auto tensioner 10 as a whole, and a rotating body 3 that is supported by the tensioner support 2 so as to be rotatable about a first rotation axis L1. The pulley 4 having a cylindrical portion 43 that is rotatably supported around a second rotation axis L2 parallel to the first rotation axis L1 with respect to the rotation body 3, and the tensioner support body 2 and the rotation body 3 And an urging means (spring) 52 that urges the rotating body 3 to oppose the force applied from the power transmission body (belt) 6 via the pulley 4. The rotation side provided is tensioner support The fixed-side locking portion 23 provided at an appropriate position on the fixed side and the rotating-side locking portion provided at an appropriate position on the rotating side when in a predetermined locking position with respect to the fixed side provided with 2 33 is configured so that it can be locked between the fixed side locking portion 23 and the rotating side locking portion 33 at the locking position, so that the rotation side is not particularly held. In addition, it is possible to prevent the rotating side biased by the biasing means from moving relative to the fixed side.

  In the present embodiment, the tensioner support 2 has a cylindrical portion 21 forming the first rotation axis L1, a bottom surface projecting radially outward from one end of the cylindrical portion 21, and at least a part of the cylindrical portion 21 with a diameter. The rotating body 3 includes a cover portion 31 having an internal space into which at least a part of the columnar portion 21 is inserted, and the fixed-side locking portion 23 includes a cup. It is formed so as to project on the side surface of the portion 22 and has a hole 24 along the tensioner axial direction, and the rotation side locking portion 33 is formed so as to project on the side surface of the cover portion 31 and extends in the tensioner axial direction. And a rod-like member (tool) W is passed through the hole 24 of the fixed side locking portion 23 and the hole 34 of the rotation side locking portion 33 at the locking position. Stop part 23 and rotation side locking part 33 Since it is configured to be able to be locked, a rod-shaped member (tool) W is inserted into or extracted from the hole 24 provided in the fixed side locking portion 23 and the hole 34 provided in the rotation side locking portion 33. It is possible to easily switch between a state where the rotating side is fixed at the locking position and a free state with respect to the fixed side.

  Therefore, according to the present embodiment, workability in maintenance and the like can be improved.

  The autotensioner of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

2 Tensioner support 3 Rotating body 4 Pulley 6 Belt (power transmission body)
DESCRIPTION OF SYMBOLS 10 Auto tensioner 21 Cylindrical part 22 Cup part 23 Fixed side latching part 24 Hole 31 Cover part 33 Rotation side latching part 34 Hole 43 Cylindrical part 52 Spring (biasing means)
L1 rotation axis (first rotation axis)
L2 rotation axis (second rotation axis)
W Tool (Bar-shaped member)

Claims (2)

An auto tensioner that applies tension to the power transmission body by elastically bringing a pulley into contact with a power transmission body wound between a plurality of gears,
A tensioner support that supports the entire auto tensioner, a rotating body that is rotatably supported about the first rotation axis with respect to the tensioner support, and a parallel to the first rotation axis with respect to the rotation body A pulley having a cylindrical portion that is rotatably supported around a second rotating shaft, and is interposed between the tensioner support body and the rotating body, and is applied to the force applied from the power transmission body via the pulley. Urging means for urging the rotating body to oppose,
When the rotating side including the rotating body and the pulley is at a predetermined locking position with respect to the fixed side including the tensioner support, a fixed side locking portion provided at an appropriate position on the fixed side; and An auto tensioner configured to be able to be locked with a rotation side locking portion provided at an appropriate position on the rotation side. The tensioner support includes a cylindrical portion that forms the first rotation axis, a bottom surface that protrudes radially outward from one end of the cylindrical portion, and a side surface that covers at least a portion of the cylindrical portion from the radially outer side. With a cup,
The rotating body includes a cover portion having an internal space into which at least a part of the cylindrical portion is inserted,
The fixed-side locking portion is formed so as to project on the side surface of the cup portion and includes a hole along the tensioner axial direction.
The rotation side locking portion is formed so as to protrude from the side surface of the cover portion and includes a hole along the tensioner axial direction,
At the locking position, the fixed side locking portion and the rotation side locking portion can be locked by passing a rod-shaped member through the hole of the fixed side locking portion and the hole of the rotation side locking portion. The auto tensioner according to claim 1, wherein the auto tensioner is configured.

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