JPH0366958A - Automatic tensioner - Google Patents

Abstract

PURPOSE:To prevent the deposition between a rubber cylinder and the oscillating cylinder of an oscillating member effectively so as to improve the durability and reliability of an auto-tensioner by providing circular metal rings at the axially intermediate part of the rubber cylinder, thereby dividing the rubber cylinder plurally across its axial direction. CONSTITUTION:A rubber cylinder 24 is divided plurally across its axial direction by circular metal rings 42 so as to be reinforced. Accordingly, even if torsional stress is applied to the rubber cylinder, large creases based on buckling deformation are not generated to the inner peripheral surface of the rubber cylinder 24, and the inner peripheral surface of the rubber cylinder 24 and the outer peripheral surface of an oscillating cylinder 20 re prevented from easy deposition.

Description

[Detailed Description of the Invention] (Industrial Application Field) The autotensioner according to the present invention includes a belt for driving engine auxiliary equipment such as an alternator and a compressor;
Alternatively, it is used to apply appropriate tension to the timing belt of an automobile engine.

(Prior Art) When driving auxiliary equipment of an automobile engine such as an alternator, a compressor, or an oil pump for power steering, a belt drive mechanism as shown in FIG. 7 is used.

In FIG. 7, 2 is a driving pulley rotationally driven by the engine crankshaft, 3.3 is a driven pulley fixed to the end of the input shaft of various auxiliary machines, and 4.4 is a part of the belt 1. A guide pulley 5 that guides the belt 1 is a tension pulley that applies appropriate tension to the belt 1.

The tension pulley 5 is pivotally supported, for example, at the tip of a swinging member 7 that swings about a pivot 6. One end of a spring 8 is connected to this swinging member 7, and by elastically pressing the tension pulley 5 toward the belt 1, dimensional changes (elongation) of the belt 1 etc. due to long-term use are caused. ), the tension of this belt 1 is always kept constant.

Incidentally, an autotensioner for always applying appropriate tension to the belt 1 needs to have the following functions.

That is, when the tension changes as the belt 1 stretches (
When the belt 1 becomes slack), the belt 1 follows the movement of the belt 1, but when the belt 1 vibrates finely, the belt 1 must be suppressed so that the vibrations are not amplified.

For this reason, an autotensioner as described in US Pat. No. 4,473,362 has been known.

This conventional auto tensioner is constructed as shown in FIG.

In this FIG. 8, 10 is a fixed shaft fixed to the board 11 with a bolt 9, and this fixation! A rubber buffer cylinder 12 is fixed to the outer peripheral surface of i[1110 by press-fitting.

On the other hand, a swinging member 7 with a tension pulley 5 pivotally supported at its tip
A metal sleeve 14 is fixed to the inner circumferential surface of a synthetic resin holding tube 13 fixed to the base end of the buffer tube 12, and this sleeve 14 is slidably fitted onto the buffer tube 12. has been done.

A coil spring 16 having elasticity in the torsional direction is provided between the housing 15 fixed to the substrate 11 and the swinging member 7, and this coil spring 16 presses the belt against the tension pulley 5. gives it elasticity.

In the auto tensioner configured in this way, when the belt that the tension pulley 5 is in elastic contact with vibrates slightly, the rubber buffer cylinder 12 absorbs this vibration, and when the belt is displaced significantly, The inner circumferential surface of the sleeve 14 and the outer circumferential surface of the buffer tube 12 slide against each other, thereby causing the swinging member 7 to swing, thereby causing the tension pulley 5 to follow the movement of the belt.

(Problems to be Solved by the Invention) However, in the case of conventional auto tensioners configured and operated as described above, the effect of damping vibrations is not necessarily sufficient, and the durability is also insufficient. Ta.

That is, in order to absorb the fine vibrations of the belt, it is necessary that the inner circumferential surface of the sleeve 14 and the outer circumferential surface of the buffer tube 12 are in contact with each other with appropriate pressure. If it deviates from this value, sufficient vibration damping performance cannot be obtained. Furthermore, due to wear and deterioration of the rubber i-operative part 12 due to long-term use, the above pressure gradually decreases.
Eventually, looseness may occur at the engagement portion between the sleeve 14 and the buffer tube 12.

In this way, if rattling occurs in the engagement portion between the sleeve 14 and the LTI cylinder 12, it becomes impossible to suppress fine vibrations of the belt, and the function as an auto-tensioner becomes insufficient.

Other examples of auto tensioners for applying appropriate tension to the belt include U.S. Pat. No. 63-77154, U.S. Pat.
However, the structure for vibration damping is complicated, the manufacturing cost is high, and there are problems with minute vibrations.
It was not always possible to effectively attenuate it.

In order to eliminate such inconvenience, the present inventor first developed the ninth to
We invented an autotensioner having the structure shown in Figure 12 (1999 patent application No. 62164).

In FIG. 9, 17 is a fixing shaft of the fixing member, which is formed into a cylindrical shape as a whole, and has one end (the upper end in FIG. 9) that is a short cylinder with a bottom that covers a part of the fixing member. It is made to continue to the bottom part 18a of the shaped housing piece 18. This housing piece 18 has a bottom portion 18a continuous from one end of the fixed @17.
Furthermore, a peripheral wall portion 18b concentric with the fixed shaft 17 is formed on the peripheral edge of the fixed shaft 17. ! ! A swing cylinder 2o formed at the base end of the 7 member 19 is externally fitted via a sliding bearing 21.

At the base of the swinging member 19, a short cylindrical housing piece 22 with a bottom is provided at a position surrounding the swinging barrel 2o.
This housing piece 22 is formed in a continuous state with
By combining the housing piece 18 and the housing piece 18 in the middle, a housing 25 is formed which covers a torsion coil spring 23 and a rubber cylinder 24, which will be described below.

A pair of housing pieces 18 that constitute this housing 25
．． 22, one housing piece I with fixing @17
A first uneven portion 26 is formed on the inner surface of the bottom portion 18a of 8, as shown in FIGS. 9 and 11. Further, on one end surface (upper end surface in FIG. 9) in the axial direction (vertical direction in FIG. 9) of the rubber cylinder 24, which is a solid damping device, there is a second uneven portion that meshes with the first uneven portion 26. 27 is formed.

On the other hand, as shown in FIGS. 9 and 12, a third uneven portion 2 is formed on the inner surface of the bottom portion 22a of the housing piece 22, which has the swing tube 20 through which the fixed shaft 17 is inserted through the sliding bearing 21.
8 is formed. In addition, a rubber cylinder 24 which is a solid damping device
A fourth uneven portion 29 that engages with the third uneven portion 28 is formed on the other end surface in the axial direction (lower end surface in FIG. 9).

When the auto tensioner of the previous invention is assembled,
First and second uneven parts 26 and 27 and third and fourth uneven parts 2
8.29 are in a state in which they are in mesh with each other, and therefore stress in the torsional direction is applied to the rubber tube 24 as the fixed shaft 17 and the swinging member 19 are displaced.

However, in the case of actually configuring an autotensioner, as shown in FIGS. 13 to 15, the second and fourth uneven portions 27 are formed on both end surfaces of the rubber cylinder 24, the overall shape of which is circular. ．．
Metal plate 41.4 formed by bending into a shape corresponding to 29
1 by baking or attaching with an adhesive or the like, even if stress in the torsional direction is applied to the rubber tube 24, the second and fourth uneven portions 27 can be removed at both ends of the rubber tube 24. .2
Make sure that no cracks occur in the part where 9 is formed.

Furthermore, slot holes 30 that are long mutually in the circumferential direction are formed in the bottom part 18a of the housing piece 18 on the side of the fixed shaft 17, and a first locking part 31 formed at one end of the torsion coil spring 23 is formed.
can freely protrude out of the housing piece 18 through this slot hole 30. The first locking part 31 protruding outside the housing piece 18 in this way is attached to the side surface of the engine, etc., on the "base plate 11" (FIG. 8) on which the auto tensioner is mounted.
Insert it into the locking hole formed in.

On the other hand, a housing piece 22 integrally formed with the swinging member 19
A through hole 33 is formed in the peripheral edge of the torsion coil spring 23 for inserting a second locking portion 32 formed at the other end of the torsion coil spring 23 . Further, the opening edges of the pair of housing pieces 18.22 are formed with protrusions 34.35 that can abut against each other when the housing pieces 18.22 are combined with each other, thereby forming an engaging portion. Thus, the amount of displacement between the four housing pieces 18 and 22 is limited regardless of the elasticity of the torsion coil spring 23.

That is, the first locking part 31 formed at one end of the torsion coil spring 23 is inserted into the locking hole formed in the substrate 11 through the slot hole 30, and the second locking part 32 formed at the other end is inserted.
A through hole 33 formed in the housing piece 22 on the swinging member 19 side
When the housing piece 22 on the swinging member 19 side is inserted, elasticity is applied to the housing piece 22 on the swinging member 19 side by the torsion coil spring 23 in the direction of rotation about the fixed shaft 17, but the amount of rotation of the housing piece 22 is An engagement formed by a pair of projections 34, 35 prevents the torsion coil spring 23 from becoming completely free. Therefore, the torsion coil spring 23 is preloaded even before the tension pulley 5, which will be described later, is pressed against the belt.

Furthermore, in the state where the torsion coil spring 23 is preloaded in this way, the rubber tube 24 is connected to the pair of housing pieces 18.2.
A stress in the torsional direction is applied between the coil springs 2 and 2.
It is assumed that the preload applied to the rubber cylinder 3 and the stress applied to the rubber cylinder 24 are independent from each other. That is, the torsion coil spring 23
The magnitude of the preload applied to the rubber cylinder 24 is determined from the viewpoint of applying appropriate tension to the belt, and the magnitude of the stress applied to the rubber cylinder 24 is determined from the viewpoint of effectively damping vibrations.

Furthermore, the proximal end of the arm piece 36 is coupled to the outer peripheral surface of the housing piece 22 on the swinging member 19 side, which is given elasticity by the torsion coil spring 23 as described above. The tension pulley 5 is rotatably supported by a rolling bearing 39 supported by a bolt 38 on a side pivot 37 . The rotation center of this tension pulley 5 (
It coincides with the center of the rolling bearing 39. ) is the fixed shaft 1
7, and as the swinging member 19 swings around the fixed shaft 17 due to the elasticity of the torsion coil spring 23, the outer peripheral surface of the tension pulley 5 is pressed against a belt such as a timing belt. I have to.

The auto-tensioner of the previous invention configured as described above connects the cylindrical fixed shaft 17 to the engine block with the bolt 9 (see FIG. 8, omitted in FIG. 9) inserted from below in FIG. By fixing it to the board such as the side surface of the board, it is attached to a predetermined part of the front of the board, but when performing this mounting work, one end of the torsion coil spring 23 is attached to the bottom 18a of the housing piece 18.
The hole formed in the substrate locks the protruding portion.

In this way, once the auto tensioner is installed at the predetermined location on the front of the board, the tip of the square wrench is fitted into the square tube part 40 formed in the middle part of the swinging member 19, and the square wrench is operated. Then, the tension pulley 5 pivotally supported at the tip of the swinging member 19 swings against the elasticity of the torsion coil spring 23 in a direction away from the running position of the belt 1 (FIG. 7).

Then, while the swinging member 19 is kept swinging in this manner, the belt 1 is hooked onto the tension pulley 5, and the torsional force applied to the swinging member 19 is released using a square wrench or the like. .

In this state, the swinging member 19 swings due to the elasticity of the torsion coil spring 23, and the outer peripheral surface of the tension pulley 5, which is rotatably supported by a rolling bearing 39 at the tip of the swinging member 19, is attached to the belt 1. An appropriate tension is applied to the belt 1 according to the elasticity of the I return coil spring 23.

When the belt 1 that is pressed by the tension pulley 5 generates small vibrations (when the tension of the belt 1 is suddenly increased (increasing motion occurs repeatedly), this vibration causes the rolling bearing 39
The vibration is transmitted to the swinging member 19 via the torsion coil spring 23, and the swinging member 19 tends to swing against the elasticity of the torsion coil spring 23.

When the swinging member 19 attempts to swing, this swinging member 1
When stress in the torsional direction is applied to the rubber cylinder 24, which is provided so as to pass between the housing piece 22 on the 9 side and the housing piece 18 on the fixed shaft 17 side, and the rubber cylinder 24 is deformed, the internal Due to the hysteresis loss caused by the swinging member 19
However, in the case of the autotensioner of the earlier invention, the amount of torsional deformation applied to the rubber cylinder 24 in advance is the highest, independent of the preload applied to the torsion coil spring 23. The vibration damping effect of the rubber tube 24, which is designed to cause hysteresis loss, is sufficient.

In addition, if the tension of the belt 1 changes greatly (if the tension decreases) due to elongation of the belt 1 due to long-term use, etc., the swinging member 19 about the fixed shaft 17
The tension pulley 5 swings based on the elasticity of the torsion coil spring 23, and the tension pulley 5, which is pivotally supported at the front end of the swinging member 19 via a rolling bearing 39, follows the movement of the belt 1. Continue to apply appropriate tension to the

(Problems to be Solved by the Invention) However, in the case of the autotensioner according to the prior invention which is constructed and operates as described above, it was found through experiments by the present inventor that the following problems occur during use.

That is, when the auto tensioner is used, as the swinging member 19 swings about the fixed shaft 17, the rubber cylinder 24
When stress in the torsional direction is applied to the rubber tube 24, wrinkles occur in the middle part of the rubber tube 24 due to buckling deformation, and these wrinkles
If wrinkles occur on the inner circumferential surface of the rocking tube 20, the top of the wrinkles and the outer circumferential surface of the swing tube 20 will rub against each other.

Because the auto tensioner is installed in a high-temperature area such as the inside of a car's engine room, the top of the wrinkles formed on the inner peripheral surface of the rubber tube 24 and the rocking structure made of metal such as aluminum are used. If the outer circumferential surfaces of the cylinder 20 rub against each other, in severe cases, the rubber cylinder 24 and the swing cylinder 20 will be welded together, and the tlII11 member 19 will not be sufficiently displaced with respect to the fixed shaft 17.

Furthermore, in order to prevent the metal plates 41, 41 attached to both ends of the rubber tube 24 from rusting, it has been considered to paint the surface of each metal plate 41, 41 together with the surface of the rubber tube 24. When the inner circumferential surface of the rubber tube 24 is coated, the gap between the inner circumferential surface of the rubber tube 24 and the outer circumferential surface of the swinging tube 2° becomes smaller by the thickness of the coating, and the rubber tube 24 inner peripheral surface and swing tube 2
It becomes easy to weld the outer peripheral surface of o.

Furthermore, when the cylindrical rubber tube 24 is made by injection molding,
Normally, an injection port for feeding rubber into the inside of the mold is provided on the inner peripheral surface of the rubber cylinder 24, but in this case, the injection port is provided on the inner peripheral surface of the rubber cylinder 24 after molding. A burr is formed in the area where the oscillating shaft 20 is rotated, and the burr tends to be welded to the outer circumferential surface of the swing shaft 20.

The autotensioner of the present invention eliminates the above-mentioned disadvantages.

(Means for Solving the Problems) The autotensioner of the present invention has a fixed shaft of a fixed member and a swing cylinder provided in a part fitted onto the fixed shaft, so that the tensioner is centered around the fixed shaft. a tension pulley pivotally supported on the swinging member by a pivot parallel to the fixed shaft provided on a part of the swinging member; and a torsion coil spring that applies elasticity to the swinging member in the direction of pressing the tension pulley against the belt, the swinging member and the fixed member facing each other. Between the circumferential surfaces, a second uneven part provided at one end in the axial direction is connected to the first uneven part provided on the inner surface of the fixing member, and a fourth uneven part provided at the other end in the axial direction is connected to the rocking member. The third uneven portion provided on the inner surface of the member is provided with a rubber tube that is engaged with each of the third uneven portions.

In the case of the auto-tensioner according to claim 1, a circular metal ring is provided in the axially intermediate portion of the rubber cylinder, and the rubber cylinder is divided into a plurality of parts in the axial direction, thereby being reinforced. are doing.

Moreover, in the case of the autotensioner described in claim 2, a lubricating film is formed on a portion of the outer peripheral surface of the swinging cylinder that faces the inner peripheral surface of the rubber cylinder.

Further, in the case of the autotensioner described in claim 3, a sleeve made of synthetic resin is externally fitted and fixed to the swinging cylinder.

Further, in the case of the auto tensioner described in claim 4, metal plates having shapes matching the shapes of the second and fourth uneven portions are fixed to both end surfaces of the rubber cylinder, and the rubber cylinder is coated. A phosphoric acid coating is applied to the surface of the metal plate without applying any coating. It is being processed.

Furthermore, in the case of the auto tensioner according to claim 5,
The injection port for injection molding the rubber cylinder is located on the outer peripheral surface side of the rubber cylinder.

(Function) With the odometer tensioner of the present invention configured as described above,
The function itself of applying appropriate tension to the belt or damping the vibration when the belt vibrates is as follows.
This is similar to the case of the auto tensioner according to the earlier invention described above.

However, in the case of the autotensioner of the present invention, the following actions prevent the inner peripheral surface of the rubber cylinder and the outer peripheral surface of the swing cylinder from welding together.

That is, in the case of the auto tensioner according to claim 1,
Since the rubber tube is reinforced by dividing it into multiple sections in the axial direction using a circular metal ring, even if stress is applied to the rubber tube in the torsional direction, buckling will not occur on the inner circumferential surface of the rubber tube. Large wrinkles due to deformation are not formed, and the inner circumferential surface of the rubber cylinder and the outer circumferential surface of the swinging tube are less likely to be welded together.

Further, in the case of the auto tensioner described in claims 2 to 3, the lubricating film formed on the outer circumferential surface of the swinging cylinder, or the synthetic resin sleeve externally fitted and fixed to the swinging cylinder, The inner circumferential surface of the rubber tube and the outer circumferential surface of the swing tube are no longer rubbed strongly against each other, making it difficult for the inner circumferential surfaces to be welded together.

Further, in the case of the auto tensioner described in claim 4, the rubber cylinder is not painted, but the surface of the metal plate is treated with a phosphoric acid film to prevent the metal plate from rusting. ,
By ensuring a sufficient gap between the inner circumferential surface of the rubber tube and the outer circumferential surface of the swinging tube, the inner circumferential surface of the rubber tube and the outer circumferential surface of the swinging tube can be prevented from rubbing against each other. Makes it difficult to weld the surrounding surface.

Furthermore, in the case of the auto tensioner according to claim 5,
By locating the injection port when injection molding the rubber cylinder on the outer peripheral side of the rubber cylinder, it is possible to prevent the formation of burrs on the inner periphery of the rubber cylinder. To prevent strong rubbing between the outer circumferential surface of the swing cylinder and the inner circumferential surface, and to make it difficult to weld the inner circumferential surface.

(Example) Next, the present invention will be explained in more detail while explaining the illustrated embodiment.

In addition, regarding structures other than the structure for making it difficult to weld the inner circumferential surface of the rubber tube 24 and the outer circumferential surface of the swinging tube 20, the above-mentioned Nos. 9 to 12 are applicable.
Since it is similar to the autotensioner according to the previous invention shown in the figure, duplicate explanation will be omitted.

1 to 3 show a first embodiment of the present invention corresponding to the invention stated in claim 1, FIG. 1 is a perspective view of a rubber tube, and FIG. A sectional view and FIG. 3 are perspective views of the metal ring.

A hook is provided so as to pass between the fixed member provided with the fixed shaft 17 and the swing member 19 provided with the swing cylinder 20 (see FIG. 9), and is used to damp vibrations applied to the swing member 19. Rubber tube 24
A circular metal ring 42 is provided in the axially intermediate portion of the rubber cylinder 24 to divide it into two parts in the axial direction,
This rubber tube 24 is reinforced.

As mentioned above, in the case of the auto tensioner of the present invention incorporating the rubber tube 24 divided into two at the axially intermediate portion, the length of the elastically deformable portion of the rubber tube 24 in the axial direction is shortened. Even if stress in the torsional direction is applied to the rubber tube 24, large wrinkles due to buckling deformation will not be formed on the inner peripheral surface of the rubber tube 24.

As a result, the inner circumferential surface of the rubber @ 24 and the outer circumferential surface of the swing tube 20 are less likely to rub against each other, making it difficult for the inner circumferential surfaces to weld together.

Next, Figure 's4 is a sectional view of a swinging member, showing a second embodiment of the present invention, corresponding to claim 2.

In the case of the autotensioner of this embodiment, by coating the outer circumferential surface of the swinging tube 20 opposite the inner circumferential surface of the rubber tube 24 with a material having a low coefficient of friction, such as fluororesin or molybdenum disulfide, A lubricating film 43 is formed on the outer peripheral surface of the swing cylinder 20.

As described above, in the case of the auto tensioner of this embodiment incorporating the swinging member 19 in which the lubricating film 43 is formed on the outer peripheral surface of the swinging cylinder 20, the lubricating film 43 causes the rubber cylinder 2 to
4 and the outer circumferential surface of the swing tube 20 are no longer strongly rubbed against each other, and the inner circumferential surfaces are less likely to be welded together.

Next, FIG. 5 is a cross-sectional view of a swinging member showing a third embodiment of the present invention corresponding to claim 3.

In the case of the auto-tensioner of this embodiment, by externally fitting and fixing the sleeve 44 of a synthetic resin bag to the swinging cylinder 20, the rubber cylinder 20
The inner peripheral surface of the sleeve 44 is opposed to the outer peripheral surface of the sleeve 44.

As described above, in the case of the auto tensioner of this embodiment, which incorporates the swinging member 19 in which the sleeve 44 of the synthetic resin bag is fitted and fixed to the swing cylinder 20, the inner circumferential surface of the rubber cylinder 24 is Since the rubber tube 24 and the outer circumferential surface of the swing tube 20 do not rub against each other strongly, and since the rubber tube 24 faces a synthetic resin that is difficult to weld to rubber, the inner circumferential surface becomes difficult to weld.

Note that the sleeve 44 of the synthetic resin bag does not necessarily have to be formed into a cylindrical shape, but may be formed with a plurality of slits 45, 45 extending in the axial direction, as shown in FIG. 6', for example.

(Effects of the Invention) Since the autotensioner of the present invention is configured and operates as described above, it is possible to effectively prevent the rubber tube constituting the autotensioner from welding to the swinging tube of the swinging member. The durability and reliability of the auto tensioner can be improved.

[Brief explanation of drawings]

The first to third figures correspond to the invention described in claim 1,
Embodiment 1 of the present invention is shown, in which Fig. 1 is a perspective view of a rubber cylinder, Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is a perspective view of a metal ring, and Fig. 4 is a perspective view of a rubber tube. FIG. 5 is a sectional view of the swinging member showing a second embodiment of the present invention corresponding to claim 2; FIG. 5 is a cross-sectional view of the swinging member showing a third embodiment of the invention corresponding to claim 3. 6 is a perspective view showing the sleeve separately, FIG. 7 is a front view showing an engine timing belt drive mechanism equipped with an auto-tensioner, and FIG. 8 is a sectional view showing an example of a conventional auto-tensioner. Figures 9 to 12 show an autotensioner according to the previous invention, with Figure 9 being a sectional view and Figure 10 being a sectional view.
The figure is a front view seen from below in Figure 9, Figure 11 is a sectional view taken along line B-B in Figure 9, Figure 12 is a sectional view taken along line CC in Figure 9, Figure 13 is a perspective view of the rubber cylinder, and Figure 14 is a sectional view taken along line C-C in Figure 9. The figure is the same end view, and Figure 15 is the 1st view.
FIG. 3 is a sectional view taken along line DD in FIG. 3; 1: belt, 2: driving pulley, 3: driven pulley, 4 guide pulley, 5: tension pulley, 6: pivot, 7 swinging member, 8: spring, 9: bolt, 10: fixed shaft, 11: board, 12: Buffer tube, 13: Holding tube, 14 Ni sleeve, 1
5: Housing, 16: Coil spring, 17: Fixed shaft, 1
8: Housing piece, 18a: Bottom part, 18b two peripheral wall parts, 1
9: Swinging member, 20: Swinging tube, 21: Sliding bearing, 22:
Housing piece, 22a: bottom, 23: torsion coil spring,
24: Rubber cylinder, 25: Housing, 26: First uneven part, 27: Second uneven part, 28: Third uneven part, 29: Fourth uneven part, 30 Nislot hole, 31: First uneven part locking part,
32: second locking part, 33: through hole, 34.35: protruding part, 36: arm piece, 37: pivot, 38: bolt, 39: rolling bearing, 40: square cylinder part, 41: metal plate, 42: metal ring,
43: i11 slippery film, 44 Nisleeve, 45 Nisrit.

Claims (5)

[Claims] (1) A fixed shaft of the fixed member and a swinging cylinder provided in a part thereof are fitted onto the fixed shaft to form a swinging member that swings around the fixed shaft, and a part of this swinging member. established in
A tension pulley is pivotally supported on a swinging member by a pivot parallel to the fixed shaft, and one end is locked to the fixed member and the other end to the swinging member, and elasticity is applied in the direction of pressing the tension pulley against the belt. a torsion coil spring applied to the swinging member, and a second uneven portion provided at one end in the axial direction between the mutually opposing circumferential surfaces of the swinging member and the fixed member; A rubber tube is provided in which a first uneven portion provided on the inner surface of the member and a fourth uneven portion provided on the other end in the axial direction are engaged with a third uneven portion provided on the inner surface of the swinging member. and an auto tensioner reinforced by dividing the rubber cylinder into a plurality of parts in the axial direction by providing a circular metal ring in the axially intermediate portion of the rubber cylinder. (2) A fixed shaft of the fixed member and a swinging cylinder provided in a part are fitted onto the fixed shaft, thereby forming a swinging member that swings around the fixed shaft, and a part of this swinging member. established in
A tension pulley is pivotally supported on a swinging member by a pivot parallel to the fixed shaft, and one end is locked to the fixed member and the other end to the swinging member, and elasticity is applied in the direction of pressing the tension pulley against the belt. a torsion coil spring applied to the swinging member, and a second uneven portion provided at one end in the axial direction between the mutually opposing circumferential surfaces of the swinging member and the fixed member; A rubber tube is provided in which a first uneven portion provided on the inner surface of the member and a fourth uneven portion provided on the other end in the axial direction are engaged with a third uneven portion provided on the inner surface of the swinging member. , and an autotensioner in which a lubricating film is formed on a portion of the outer circumferential surface of the swinging tube that faces the inner circumferential surface of the rubber tube. (3) A fixed shaft of the fixed member and a swinging cylinder provided in a part are fitted onto the fixed shaft to form a swinging member that swings around the fixed shaft, and a part of this swinging member. established in
A tension pulley is pivotally supported on a swinging member by a pivot parallel to the fixed shaft, and one end is locked to the fixed member and the other end to the swinging member, and elasticity is applied in the direction of pressing the tension pulley against the belt. a torsion coil spring applied to the swinging member, and a second uneven portion provided at one end in the axial direction between the mutually opposing circumferential surfaces of the swinging member and the fixed member; A rubber tube is provided in which a first uneven portion provided on the inner surface of the member and a fourth uneven portion provided on the other end in the axial direction are engaged with a third uneven portion provided on the inner surface of the swinging member. , and an auto tensioner in which a sleeve made of synthetic resin is externally fitted and fixed to the swinging cylinder. (4) A fixed shaft of the fixed member and a swinging cylinder provided in a part are fitted onto the fixed shaft, thereby forming a swinging member that swings around the fixed shaft, and a part of this swinging member. established in
A tension pulley is pivotally supported on a swinging member by a pivot parallel to the fixed shaft, and one end is locked to the fixed member and the other end to the swinging member, and elasticity is applied in the direction of pressing the tension pulley against the belt. a torsion coil spring applied to the swinging member, and a second uneven portion provided at one end in the axial direction between the mutually opposing circumferential surfaces of the swinging member and the fixed member; A rubber tube is provided in which a first uneven portion provided on the inner surface of the member and a fourth uneven portion provided on the other end in the axial direction are engaged with a third uneven portion provided on the inner surface of the swinging member. , and a metal plate having a shape that matches the shape of the second and fourth uneven portions is fixed to both end surfaces of the rubber tube, and the surface of the metal plate is coated without painting the rubber tube. Auto tensioner with phosphoric acid film treatment. (5) A fixed shaft of the fixed member and a swinging cylinder provided in a part are fitted onto the fixed shaft, thereby forming a swinging member that swings around the fixed shaft, and a part of this swinging member. established in
A tension pulley is pivotally supported on a swinging member by a pivot parallel to the fixed shaft, and one end is locked to the fixed member and the other end to the swinging member, and elasticity is applied in the direction of pressing the tension pulley against the belt. and a torsion coil spring applied to the swinging member, and a second uneven portion provided at one end in the axial direction between the mutually opposing circumferential surfaces of the swinging member and the fixed member. A rubber cylinder is provided in which a first uneven portion provided on the inner surface of the fixed member and a fourth uneven portion provided on the other end in the axial direction are engaged with a third uneven portion provided on the inner surface of the swinging member. An auto tensioner comprising: an injection port for injection molding the rubber cylinder, and an injection port located on the outer peripheral surface side of the rubber cylinder.