JP2005188659A - Belt transmission system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To unexpensively provide a belt transmission system which holds down the maximum tension of a belt to enable an improvement in durability, reduces the number of parts, and has a simple structure, in the belt transmission system having two or more power sources. <P>SOLUTION: The belt transmission system is provided with a tensioner device to impart tension for the belt to transmit driving force between the power source 1 and the load including at least another power source. The tensioner device is provided with one direction unwinding tension adjusting mechanisms 15, 16 to hold an action element 5 to impair the tension via the belt at the position when the belt tension increases, and unwind in the direction of increasing the belt tension when the belt tension falls below the predetermined unwinding tension. The tension at standstill of the belt is set to a predetermined tension which is greater than the unwinding tension. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a belt transmission system including a tensioner device that applies tension to a belt that transmits a driving force between two or more power sources or between two or more power sources and one or more loads. .

As an example of transmitting a driving force between two power sources via a belt, there is one configured between an internal combustion engine and a motor / generator in a vehicle.
Consider a simplified belt transmission system in which tension is applied to a belt by an auto tensioner using only an internal combustion engine and a motor / generator as drive sources, with reference to the schematic diagram and tension graph of FIG.

  As shown in FIG. 13A, a belt 04 is bridged between a crank pulley 01 fitted to the crankshaft of the internal combustion engine and an MG pulley 02 fitted to the input / output shaft of the motor / generator (MG). The tensioner pulley 03 of the auto tensioner acts on the belt 04 to apply tension.

  In the belt 04, the span a between the crank pulley 01 and the MG pulley 02, the span b between the MG pulley 02 and the tensioner pulley 03, and the span c between the tensioner pulley 03 and the crank pulley 01 are more than three spans a. , B, and c are shown in FIG. 13B.

  In FIG. 13B, a solid line indicates a case where the crank pulley 01 becomes a driving pulley when the internal combustion engine is driven and the MG pulley 02 is rotated via the belt 04 to operate the motor / generator as a generator (when the internal combustion engine is driven). ), The tension of the span a on the tension side is high, and the tension of the spans b and c on the loose side is low.

  In FIG. 13B, a broken line indicates a case where the motor / generator is driven as an electric motor and the MG pulley 02 serves as a driving pulley to rotate the crank pulley 01 via the belt 04 to start the internal combustion engine (starting of the internal combustion engine). The tension of the spans b and c on the tension side is set to a constant tension T0 by the auto tensioner, whereas the tension of the span a on the loose side becomes lower, and the auto tensioner on the tension side becomes Operates in a direction that reduces the overall tension of the belt.

  In both cases of driving and starting the internal combustion engine, the tensions of the spans b and c are maintained at a constant tension T0 by the auto tensioner. Therefore, the maximum tension of the span a when the internal combustion engine is driven is higher than the tension T0. The tension difference ΔT between TH and the minimum tension TL of the span a when starting the internal combustion engine lower than the tension T0 becomes large.

  Since the minimum tension TL of the span a at the start of the internal combustion engine, which is the minimum tension in this belt transmission system, requires a tension that does not cause slipping, a large tension difference ΔT indicates that the span a when the internal combustion engine is driven The tension TH, that is, the maximum tension is increased.

  As described above, since the maximum tension applied to the belt 04 is high, the load on the belt 04 is large and the tension difference ΔT is large, so that the durability may be lowered.

  In order to solve such a problem, it is conceivable that the auto tensioner is eliminated and the belt pulley 04 is directly passed over the crank pulley 01 and the MG pulley 02, and a schematic diagram and a graph of tension are shown in FIG.

  In FIG. 14B, the solid line indicates the case where the crank pulley 01 becomes a driving pulley when the internal combustion engine is driven and the MG pulley 02 is rotated via the belt 04 to operate the motor / generator as a generator (when the internal combustion engine is driven). ), The tension of the span a on the tension side is high, and the tension of the span b on the loose side is low.

  In FIG. 14B, a broken line indicates a case where the motor / generator is driven as an electric motor and the MG pulley 02 becomes a driving pulley and the crank pulley 01 is rotated via the belt 04 to start the internal combustion engine (internal combustion engine start). The tension of the span a on the loose side becomes low and the tension of the span b on the tight side becomes high.

  The tension of the span a at the time of driving the internal combustion engine on the tension side and the tension of the span b at the time of start show the same maximum tension TH, and the tension of the span a at the start of the internal combustion engine on the loose side and the span b at the time of driving. These tensions indicate the same minimum tension TL, and the tension difference ΔT is smaller than the tension difference ΔT in the case of FIG. 13 using the auto tensioner.

  Therefore, if the auto tensioner is abolished, the maximum tension applied to the belt 04 can be made smaller than when the auto tensioner is used, but the auto tensioner has the function of compensating for the belt elongation due to aging and maintaining the tension constant. However, if the auto tensioner is abolished, the belt elongation cannot be compensated, and the belt elongation reaches the service limit in a short time.

  Therefore, although the use limit can be extended by setting the initial tension higher, the belt tension is excessively high in the initial stage, and the durability is adversely affected and the frictional force during power transmission increases.

Therefore, the following example has been proposed.
An example of a belt transmission system that transmits a driving force between two power sources is one that is configured between an internal combustion engine and a motor / generator in a vehicle (see Patent Document 1).
JP 2001-59555 A

  In the publication of Patent Document 1, a belt is wound around a crank pulley fitted to a crankshaft of an internal combustion engine and a motor / generator pulley fitted to an input / output shaft of a motor / generator (auxiliary module). When the internal combustion engine is driven, the crank pulley serves as the drive pulley, and the motor / generator pulley is rotated via the belt to operate the motor / generator as a generator. Conversely, when the internal combustion engine is started, the motor / generator is driven as an electric motor. In the belt transmission system in which the motor / generator pulley becomes a driving pulley and the crank pulley is rotated via the belt to start the internal combustion engine, the first auto tensioner is provided on the downstream side of the motor / generator pulley in the belt rotation direction. , The upstream of the motor / generator pulley belt rotation direction Structure in which the second auto-tensioner is disclosed between the Kupuri.

  During normal operation when the internal combustion engine is driven, the belt tension is adjusted by functioning the first and second auto tensioners and the elongation due to aging is compensated. When starting the internal combustion engine, the belt tension is The second auto tensioner on the increasing side is locked so as not to function to prevent the belt from slipping, and the maximum tension of the belt can be kept low.

  However, since two auto tensioners are required and the number of parts is large, the second auto tensioner must be controlled to switch between locking and unlocking, and a control mechanism for that is required, which increases the cost as a whole.

  The present invention has been made in view of the above points, and the object of the present invention is to reduce the maximum tension of the belt in a belt transmission system having two or more power sources and to improve durability. A belt transmission system with a simple structure with a small number of parts is provided at low cost.

  To achieve the above object, the invention of claim 1 includes a tensioner device that applies tension to a belt that transmits driving force between a power source and a load including at least one other power source. In the belt transmission system, the tensioner device maintains an operator that acts on the belt to apply tension when the belt tension increases, and the tension of the belt falls below a predetermined feeding tension. Is provided with a one-way feeding tension adjusting mechanism that feeds the belt in a direction to increase the belt tension, and a belt transmission system in which the tension at rest of the belt is set to a predetermined tension larger than the feeding tension.

  An operator that acts on the belt to apply tension is maintained in the position when the belt tension increases, and increases in the belt tension when the belt tension falls below a predetermined feeding tension. A one-way feeding tension adjustment mechanism is provided so that when the auto tensioner is on the tension side, the auto tensioner does not decrease the overall tension of the belt by maintaining the actuator, and the auto tensioner is on the loose side. Since the operator will be maintained if the specified tension is not reduced, the situation will be the same as when the auto tensioner is abolished. Therefore, the tension difference between the maximum tension and the minimum tension of the belt is small, and the maximum tension is kept low. Can do.

  Further, when the belt elongates due to secular change, when the auto tensioner becomes on the loose side, the tension becomes lower than a predetermined feeding tension, and the operator can increase the feeding tension, and the elongation due to secular change can be compensated.

That is, durability can be improved by suppressing the maximum tension low.
One tensioner device having a one-way feeding tension adjusting mechanism may be provided, and the number of parts is small, the structure is simple, and the cost can be kept low.

  According to a second aspect of the present invention, there is provided a belt transmission system including a tensioner device that applies tension to a belt that transmits a driving force between a power source and a load including at least one other power source. Keeps the actuating element that acts on the belt to apply tension when the belt tension increases, and increases the belt tension when the belt tension falls below a predetermined feeding tension. A belt having a one-way feeding tension adjusting mechanism that can be adjusted in a direction so that the position of the belt can be adjusted, and adjusting the position of the one-way feeding tension adjusting mechanism to set the tension at rest of the belt to a predetermined tension larger than the feeding tension. It is a transmission system.

  When the auto tensioner is on the tension side due to the one-way feeding tension adjustment mechanism, the auto tensioner does not decrease the overall tension of the belt by maintaining the actuator, and when the auto tensioner becomes on the loose side, the If the tension is not lower than the feed tension, the actuator is maintained, so the situation is the same as when the auto tensioner is abolished. Therefore, the tension difference between the maximum tension higher and lower than the tension at rest of the belt is small, and the maximum tension is kept low. Can do.

  Further, when the belt elongates due to secular change, when the auto tensioner becomes on the loose side, the tension becomes lower than a predetermined feeding tension, and the operator can increase the feeding tension, and the elongation due to secular change can be compensated.

That is, durability can be improved by suppressing the maximum tension low.
One tensioner device having a one-way feeding tension adjusting mechanism may be provided, and the number of parts is small, the structure is simple, and the cost can be kept low.

  According to a third aspect of the present invention, in the belt transmission system according to the second aspect, an operation state in which the one-way feeding function of the one-way feeding tension adjusting mechanism is enabled and a non-operation state in which the one-way feeding function is disabled can be selected. After setting the feeding tension to a predetermined tension by adjusting the position of the one-way feeding tension adjusting mechanism in a non-operating state of the one-way feeding tension adjusting mechanism, the one-way feeding tension adjusting mechanism is set in an operating state, By adjusting the position of the direction feeding tension adjusting mechanism, the belt stationary tension is set to a predetermined tension larger than the feeding tension.

  After setting the feed tension to the specified tension by adjusting the position of the one-way feed tension adjustment mechanism in the non-operating state of the one-way feed tension adjustment mechanism, the one-way feed tension adjustment mechanism is activated to adjust the one-way feed tension adjustment mechanism. By adjusting the position of the mechanism, the tension at rest of the belt is set to a predetermined tension larger than the above-mentioned tension, and the tension at the time of feeding and the tension at rest can be efficiently set to the predetermined tension, respectively.

  According to a fourth aspect of the present invention, in the belt transmission system according to the first or second aspect, the operator of the tensioner device acts on a belt portion where the dynamic tension becomes the smallest during various operations of the belt transmission system. It is characterized by that.

By configuring the tensioner device to act on the belt part where the dynamic tension becomes the smallest during various operations of the belt transmission system, when the belt elongation due to secular change exceeds a predetermined length, it can be quickly The operator is fed out to prevent the belt from slipping.

According to a fifth aspect of the present invention, in the belt transmission system according to the first or second aspect, the one-way feeding tension adjusting mechanism includes an urging means using a spring and a ratchet.

  An operator that acts on the belt to apply tension is maintained at that position by a ratchet when the belt tension increases, and when the belt tension falls below a predetermined feeding tension, a spring biasing means is used. The operator can be extended in the direction of increasing the belt tension.

  According to a sixth aspect of the present invention, in the belt transmission system according to the first or second aspect, the one-way feeding tension adjusting mechanism includes an urging means using a spring and a one-way clutch.

  An operator that acts on the belt to apply tension is maintained at that position by a one-way clutch when the belt tension increases, and is biased by a spring when the belt tension falls below a predetermined feeding tension. By this means, the operator can be extended in the direction of increasing the belt tension.

Hereinafter, an embodiment according to the present invention will be described with reference to FIGS.
The belt transmission system 0 according to the present embodiment has a belt between an internal combustion engine 1 and a motor / generator, which is a generator / starter motor, mounted on a vehicle, and two auxiliary power sources such as an air-conditioning compressor and a water pump. It is a system that performs power transmission via.

A schematic configuration diagram of the belt transmission system is shown in FIG.
A crank pulley 2 is fitted on the crankshaft of the internal combustion engine 1, and a motor / generator and an auxiliary machine are supported by an auxiliary machine bracket (not shown) fixed to the engine body case 1a of the internal combustion engine 1. An MG pulley 3 is fitted on the input / output shaft of the generator, and an auxiliary pulley 4 is fitted on the input shaft of the auxiliary machine.

A tensioner unit 10 is provided on the upper part of the engine body case 1a.
In the tensioner unit 10, a tensioner base 11 is rotatably attached to the main body case 1a. The tensioner unit 10 is screwed into the engine main body case 1a through a long hole 11a formed in an arc shape in the tensioner base 11. When the bolt 12 is loosened, the tensioner base 11 can be rotated, and when the bolt 12 is tightened, the tensioner base 11 can be integrally fixed to the engine body case 1a.

  A tensioner arm 14 is pivotally attached to the tensioner base 11 with a base end portion 13 pivotally supported by a support shaft, and a tensioner pulley 5 is pivotally supported at a swingable distal end portion.

The tensioner arm 14 is biased by a torsion spring (not shown) in a swinging direction (counterclockwise in FIG. 1) indicated by a broken line arrow in FIG.

Also, ratchet teeth 15 are formed on the arcuate outer periphery of the base end portion of the tensioner arm 14, and the ratchet pawl 16 pivotally supported by the tensioner base 11 receives a slight urging force to the ratchet teeth 15. The ratchet is configured so that the tensioner arm 14 freely swings in the direction of the broken line arrow but is not allowed to swing in the opposite direction.

An endless belt 6 is wound around the tensioner pulley 5, the crank pulley 2, the MG pulley 3, and the auxiliary pulley 4 at the tip of the tensioner arm 14 that can swing.
The crank pulley 2 rotates clockwise in FIG. 1, and the MG pulley 3 rotates counterclockwise.

The swinging direction (counterclockwise direction in FIG. 1) indicated by the broken line arrow of the tensioner arm 14 is the feeding direction in which the tensioner pulley 5 is fed and the tension of the belt 6 is increased.

  Therefore, when the tension of the belt 6 is increased on the tensioner base 11 by a torsion spring that biases the tensioner arm 14 in the feeding direction and a ratchet that allows the tensioner arm 14 to swing only in one direction (feeding direction). The tensioner pulley 5 is maintained at the position, and a one-way feeding tension adjusting mechanism is configured to feed the tensioner pulley 5 in a direction to increase the tension of the belt 6 when the belt tension is lower than a predetermined feeding tension. Yes.

A method for setting the tensioner unit 10 in the belt transmission system 0 will be described.
First, as shown in FIG. 2, the ratchet pawl 16 is disengaged from the ratchet teeth 15 against the urging means to deactivate the ratchet function, and in this state, the bolt 12 is loosened and the tensioner base 11 is counterclockwise in FIG. Rotate in the direction.

The rotation of the tensioner base 11 with the ratchet function inoperative is that the urging force of the torsion spring acting on the tensioner arm 14 applies tension to the belt 6.
At this time, the tensioner base 11 is rotated in the feeding direction while measuring the belt tension of the upstream portion or the downstream portion in the belt rotation direction around which the belt 6 is wound around the tensioner pulley 5 with a tension gauge.

When the tension gauge shows a predetermined first set tension, the ratchet pawl 16 is engaged with the ratchet teeth 15 as shown in FIG. 3 to activate the ratchet function.
Then, from this state, the tensioner base 11 is further rotated counterclockwise in FIG.

  This time, since the ratchet function is in an operating state, the tensioner base 11 rotates together with the tensioner arm 14 to increase the belt tension.

  This time, the belt tension of the upstream part or the downstream part of the belt rotating direction wrapped around the tensioner pulley 5 is measured with a tension gauge, and the bolt 12 is tightened when the tension gauge shows a predetermined second set tension. The tensioner base 11 is fixed to the engine body case 1a by tightening.

In this way, the tensioner unit 10 is attached to the engine body case 1a.
The state in which this attachment is completed is shown in FIG.

The first set tension set first is the feeding tension, and here, the feeding tension is set to 18 Kgf.
The tension at which the belt slips is even smaller than 18 kgf.
The second set tension set next is the stationary tension TO, and is set to a stationary tension of 80 Kgf.

  FIG. 4 shows a schematic diagram of the belt transmission system 0 of the tension unit 10 and a graph of the belt tension.

  As shown in FIG. 4A, span a between the crank pulley 2 and the MG pulley 3, span b between the MG pulley 3 and the auxiliary pulley 4, and between the auxiliary pulley 4 and the tensioner pulley 5 FIG. 4B shows the tension fluctuations in the spans a, b, c and d of the span c and the span d between the tensioner pulley 5 and the crank pulley 2.

  In FIG. 4B, a solid line indicates a case where the crank pulley 2 becomes a driving pulley when the internal combustion engine is driven and the MG pulley 3 is rotated via the belt 6 to operate the motor / generator as a generator (when the internal combustion engine is driven). ).

When the internal combustion engine was driven, the tension of the span a on the tension side was high and about 140 Kgf, and the tension of the spans c and d on the loose side was low and about 20 Kgf.
The tension of the span b between the MG pulley 3 and the auxiliary machine pulley 4 is about 80 Kgf with a middle tension.
The tensions of the spans c and d that are the lowest are somewhat higher than the first set tension tension 18 kgf, and the intermediate tension of the span b is approximately equal to the stationary tension 80 kgf.

  In FIG. 4B, a broken line indicates a case where the motor / generator is driven as an electric motor and the MG pulley 3 serves as a driving pulley to rotate the crank pulley 2 via the belt 6 to start the internal combustion engine (starting of the internal combustion engine). Time).

When the internal combustion engine was started, the tension of the span b on the tension side was high and about 130 Kgf, and the tension of the span a on the loose side was low and about 30 Kgf.
The tension of the spans c and d wound around the tensioner pulley 5 is about 87 Kgf, which is a middle tension and somewhat larger than the stationary tension.

  Accordingly, the maximum tension TH of the belt 6 in the belt transmission system 0 is about 140 Kgf as the tension of the span a when the internal combustion engine is driven, and the minimum tension TL is about the tension of the spans c and d when the internal combustion engine is driven. The tension difference ΔT between the two is about 120 Kgf.

For comparison, FIG. 4 (C) shows a graph of the belt tension when the tension device in the belt transmission system 0 is an extendable auto tensioner.
Since the tensions of the spans c and d wound around the tensioner pulley 5 are adjusted to the stationary tension TO by the auto tensioner, the stationary tension TO is set to 80 Kgf.

  With this setting, the tension of the spans c and d on the loose side when the internal combustion engine is driven is adjusted to 80 Kgf of the stationary tension TO, so the tension of the span a on the tight side is 200 Kgf. .

  The maximum tension TH of the belt 6 in this belt transmission system is about 200 Kgf as the tension of the span a when the internal combustion engine is driven, and the minimum tension TL is about 30 Kgf as the tension of the span a when starting the internal combustion engine. The tension difference ΔT between them is about 170 Kgf.

  When the auto tensioner is used in this way, since the maximum tension TH applied to the belt 6 is high, the load on the belt 6 is large and the tension difference ΔT is large, so that the durability may be lowered.

  Therefore, the belt transmission system 0 using the tensioner unit 10 having the ratchet can reduce the tension difference ΔT and keep the maximum tension TH low as shown in FIG. The load is small and durability can be improved.

  In the belt transmission system 0, the change over time of the belt tension Tcd in the spans c and d of the belt 6 wound around the tension pulley 5 is as shown in FIG.

FIG. 5 shows the secular change of the belt tension Tcd with a considerable exaggeration for the time on the horizontal axis.
The belt 6 is gradually extended with the passage of time, and the static belt tension (tension at rest) Ts (indicated by the alternate long and short dash line in FIG. 5) decreases accordingly.
The dynamic belt tension Td (the bent solid line in FIG. 5) gradually decreases according to the static belt tension Ts while raising and lowering the static belt tension Ts.

  The dynamic belt tension Td becomes higher than the static belt tension Ts in reference to FIG. 4B. The belt tension of the spans c and d at the start of the internal combustion engine is lower than the static belt tension Ts. Is the belt tension of the spans c and d when the internal combustion engine is driven, and the decrease is larger than the increase.

  When the belt 6 extends due to secular change, the static belt tension Ts decreases and the dynamic belt tension Td decreases in the same manner. In particular, when the internal combustion engine is driven, the decrease in the dynamic belt tension Td is the first set tension. May reach a payout tension of.

When the decrease in the dynamic belt tension Td reaches the feeding tension, the tension arm 14 is swung by the urging force of the torsion spring in the feeding direction permitted to swing by the ratchet, and the tension pulley 5 is fed. Apply tension to 6
Therefore, the reduced static belt tension Ts is raised.

  The feeding amount of the tension pulley 5 (the increase amount of the static belt tension Ts) is determined by the number of ratchet pawls 16 exceeding the ratchet teeth 15 due to the relationship between the loose belt tension and the urging force of the torsion spring.

  The increased static belt tension Ts gradually decreases due to belt elongation due to secular change, and the dynamic belt tension Td also decreases along with this.

  By repeating this several times, the belt tension can be maintained, and the belt elongation due to aging can be compensated until the dynamic belt tension Td reaches the belt slip start tension lower than the feeding tension.

The tensioner unit 10 has a simple structure, and one tensioner unit 10 may be used without using a plurality of components, and the number of components is small, and the cost can be kept low.
Further, the tensioner unit 10 can be easily attached while easily setting the belt tension.

Next, a tension device using a one-way clutch as a one-way feeding tension adjusting mechanism will be described with reference to FIGS.
The tensioner unit 31 attached to the engine body case 30 has a tensioner pulley 37 rotated via a bearing 36 on a tip 35b of a tensioner arm 35 pivotally supported on a tensioner base 32 via a torsion spring 33 and a one-way clutch 34. It is supported freely.

  The tensioner base 32 has a pair of arcuate holes formed in the outer edge portion, with a cylindrical protrusion 32b at the center of the bottom surface fitted into a recess in the mounting surface of the engine body case 30 to be rotatable with respect to the engine body case 30. The tensioner base 32 can be fixed to the engine body case 30 by screwing and tightening the mounting bolts 40 penetrating the long holes 32c into the screw holes 30b of the engine body case 30. When the mounting bolts 40 are loosened, the tensioner The base 32 can be rotated with respect to the engine body case 30 around the cylindrical protrusion 32b.

  A cylindrical shaft column 32a with a female screw 32d formed on the inner surface protrudes from the center of the upper surface of the tensioner base 32, and a base end portion 35a of the tensioner arm 35 is pivotally supported by the coaxial column 32a. The tensioner arm 35 is urged counterclockwise in FIG. 6 by the torsion spring 33 interposed between the tensioner base 32 and the base end portion 35a of the tensioner arm 35.

  The base end portion 35a of the tensioner arm 35 is formed with a circular hole that is pivotally supported through the shaft column 32a of the tensioner base 32 at the center, and a peripheral wall 35d extends on the outer periphery of the opening end surface 35c of the circular hole. Yes.

  An annular one-way clutch 34 is inserted into the peripheral wall 35d of the base end portion 35a of the tensioner arm 35, and a hollow fixed disk 38 whose center is recessed from above is inserted, and the outer peripheral edge of the fixed disk 38 is A one-way clutch 34 is sandwiched between the opening end surface 35 c of the tensioner arm 35.

  The washer 41 is placed in the concave portion of the fixed disk 38, and the lock bolt 39 is threaded into the female screw 32d of the shaft column 32a of the tensioner base 32 through the washer 41 and the hollow part of the fixed disk 38 and tightened. The fixed disk 38 is sandwiched between the washer 41 and the shaft column 32a of the tensioner base 32 and fixed integrally.

  When the fixed disk 38 is fixed to the tensioner base 32, the one-way clutch 34 sandwiched between the fixed disk 38 and the tensioner arm 35 is operated, and the tensioner arm 35 is moved only counterclockwise in FIG. Oscillation is allowed and reverse clockwise oscillation is prevented.

  As described above, the tensioner pulley 37 is pivotally supported by the tip of the tensioner arm 35 that is biased counterclockwise by the torsion spring 33 with respect to the tensioner base 32 and is allowed to swing only counterclockwise by the one-way clutch 34. In the same manner as in the belt transmission system 0 of the above embodiment, the belt 45 is wound.

  A method of attaching the tensioner unit 31 to the engine body case 30 will be described below with reference to FIGS.

  First, as shown in FIG. 8, with the tensioner arm 35 assembled to the tensioner base 32 with the torsion spring 33, the tensioner base 32 is fitted to the mounting surface of the engine body case 30 and attached to the long hole 32c. The bolt 40 is passed through and screwed into the screw hole 30b of the engine body case 30 and loosened without tightening.

  Then, with the belt 45 wound around the tensioner pulley 37 so that the torsion spring 33 acts somewhat, the tensioner base 32 rotates counterclockwise, and the tensioner pulley 37 applies tension to the belt 45.

  The tensioner base 32 is rotated counterclockwise while measuring the belt tension in the belt rotation direction upstream portion or downstream portion wound around the tensioner pulley 37 with the tension gauge, and the tension gauge has a predetermined first gauge. When the set tension is shown, the mounting bolt 40 is tightened and the tensioner base 32 is temporarily fixed as shown in FIG.

  Next, the one-way clutch 34 is inserted inside the peripheral wall 35d of the tensioner arm 35, the lock bolt 39 is passed through the washer 41 and the fixed disk 38, and is screwed into the female screw 32d of the shaft column 32a of the tensioner base 32 (see FIG. 10), the fixed disc 38 is fixed to the tensioner base 32 by tightening so that the one-way clutch 34 sandwiched between the fixed disc 38 and the tensioner arm 35 functions (see FIG. 11).

Then, as shown in FIG. 12, the mounting bolt 40 is loosened, and the tensioner base 32 is further rotated counterclockwise.
This time, since the one-way clutch 34 is in an operating state, the tensioner base 32 rotates together with the tensioner arm 35 to further increase the belt tension.

  The belt tension is measured by the tension gauge, and when the tension gauge shows a predetermined second set tension, the tensioner base 32 is fixed to the engine body case 30 by tightening and tightening the mounting bolt 40.

The tensioner unit 31 is attached to the engine body case 30 in this way, and the state in which this attachment is completed is shown in FIG.
The first set tension set first is the feeding tension, and the second set tension set next is the stationary tension.

  The tensioner unit 31 functions in the same manner as the tensioner unit 10 of the above-described embodiment, and since the tension difference ΔT between the maximum tension TH and the minimum tension TL of the belt transmission system is small, the maximum tension TH can be kept low. The load applied to the belt 45 is small, and the durability can be improved.

  Also, with respect to belt elongation due to aging, the tensioner unit 10 feeds the tensioner pulley 5 stepwise by a ratchet to maintain the belt tension, whereas the tensioner unit 31 is tensioned by a one-way clutch 34. The belt tension is maintained by paying out 37 as needed to compensate for belt elongation due to aging.

  When removing the tensioner unit 31, the mounting bolt 40 is loosened, and the tensioner base 32 is freely rotated to rotate with the tensioner arm 35 to loosen the belt tension. At this time, the tension becomes the first set tension at the maximum. Yes.

Next, the lock bolt 39 is loosened, the one-way clutch 34 is deactivated, the belt is removed with the tensioner arm 35 rotating to remove the belt tension, the lock bolt 39 is pulled out, and the fixed disk 38 and the one-way clutch 34 are removed.
Thereafter, the mounting bolt 40 can be pulled out and the tensioner base 32 can be removed together with the tensioner arm 35.

1 is a schematic configuration diagram of a belt transmission system according to an embodiment of the present invention. It is a schematic block diagram of the belt transmission system which showed one process for demonstrating the attachment setting method of the tensioner unit in the belt transmission system. It is a schematic block diagram of the belt transmission system which showed the next process. It is the figure which shows the schematic diagram of the same belt transmission system, and the graph of belt tension | tensile_strength. It is explanatory drawing which shows the secular change of belt tension | tensile_strength. It is a top view of the tensioner unit which concerns on another embodiment. FIG. It is sectional drawing of the tensioner unit which showed one process for demonstrating the attachment setting method of the tensioner unit. It is a schematic block diagram of the tensioner unit which showed the next process. It is a schematic block diagram of the tensioner unit which showed the next process. It is a schematic block diagram of the tensioner unit which showed the next process. It is a schematic block diagram of the tensioner unit which showed the next process. It is a figure which shows the schematic diagram and belt tension graph of the conventional belt transmission system. It is a figure which shows the schematic diagram of another conventional belt transmission system, and the graph of belt tension | tensile_strength.

Explanation of symbols

DESCRIPTION OF SYMBOLS 0 ... Belt transmission system, 1 ... Internal combustion engine, 1a ... Engine body case, 2 ... Crank pulley, 3 ... MG pulley, 4 ... Auxiliary machine pulley, 5 ... Tensioner pulley, 6 ... Belt,
10 ... Tensioner unit, 11 ... Tensioner base, 12 ... Bolt, 13 ... Base end, 14 ... Tensioner arm, 15 ... Ratchet teeth, 16 ... Ratchet claws,
30 ... Engine body case, 31 ... Tensioner unit, 32 ... Tensioner base, 33 ... Torsion spring, 34 ... One-way clutch, 35 ... Tensioner arm, 36 ... Bearing, 37 ... Tensioner pulley, 38 ... Fixed disk, 39 ... Lock bolt,
40 ... mounting bolts, 41 ... washers, 45 ... belts.

Claims (6)

In a belt transmission system including a tensioner device that applies tension to a belt that transmits a driving force between a power source and a load including at least one other power source.
The tensioner device holds an operator that acts on the belt to provide tension when the belt tension increases, and holds the belt tension when the belt tension falls below a predetermined feeding tension. Equipped with a one-way feeding tension adjustment mechanism that feeds in a direction to increase
A belt transmission system characterized in that a tension at rest of the belt is set to a predetermined tension larger than the feeding tension. In a belt transmission system including a tensioner device that applies tension to a belt that transmits a driving force between a power source and a load including at least one other power source.
The tensioner device holds an operator that acts on the belt to provide tension when the belt tension increases, and holds the belt tension when the belt tension falls below a predetermined feeding tension. Equipped with a one-way feeding tension adjustment mechanism for adjusting the position on the system.
The belt transmission system is characterized in that the stationary tension of the belt is set to a predetermined tension larger than the feeding tension by adjusting the position of the one-way feeding tension adjusting mechanism. An operating state in which the one-way feeding function of the one-way feeding tension adjusting mechanism is enabled and a non-operating state in which it is disabled can be selected.
After setting the feeding tension to a predetermined tension by adjusting the position of the one-way feeding tension adjusting mechanism in a non-operating state of the one-way feeding tension adjusting mechanism, the one-way feeding tension adjusting mechanism is set in an operating state, and 3. The belt transmission system according to claim 2, wherein the tension at rest of the belt is set to a predetermined tension larger than the feeding tension by adjusting the position of the one-way feeding tension adjusting mechanism.   The belt transmission system according to claim 1 or 2, wherein the acting element of the tensioner device acts on a belt portion where the dynamic tension becomes smallest during various operations of the belt transmission system.   The belt transmission system according to claim 1 or 2, wherein the one-way feeding tension adjusting mechanism includes a spring biasing means and a ratchet. The belt transmission system according to claim 1 or 2, wherein the one-way feeding tension adjusting mechanism includes a spring biasing means and a one-way clutch.

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