JP2003301899A - Autotentioner device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the lowering of the durability of a valve to a minimum limit when a motor generator being an auxiliary machinery is used as a starter motor, in an autotentioner for a belt for driving the auxiliary machinery. <P>SOLUTION: First and second liquid chambers 55 and 56 formed in a tensioner body 29 telescopic according to the tension of a belt are connected via first and second communicating passages 57 and 58. A check valve 62 is situated in the first communicating passage 57 and a closing valve capable of being closed by a solenoid 66 is situated in the second communicating passage 58. When the tension of a belt is sharply increased, the solenoid 66 is excited to forcibly close the closing valve 67 and the first liquid chamber 55 is closed and the tensioner body 29 is locked into a non-telescopic state. Since a valve body 64 and a valve seat 63 of the closing valve 67 are not strongly collided by a hydraulic load, their durabilities are improved. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an autotensioner device for applying a tension to an endless transmission belt that drives auxiliary machinery of an engine including at least a motor generator.

[0002]

2. Description of the Related Art The engine of a hybrid vehicle is designed to automatically stop when the vehicle is stopped and to start automatically when the vehicle starts. A starter motor is a motor / generator connected to a crankshaft via a belt. Is used to start the engine. When the motor / generator is used as a starter motor, a strong tension is momentarily applied to the belt connecting the crankshaft and the motor / generator at the same time when it is started, so the auto tensioner is large against the elastic force of the spring. Since it contracts and then greatly expands due to the elastic force of the spring, there is a possibility that the belt will run wild and smooth power transmission will not be achieved.

Therefore, conventionally, when the motor / generator is used as a starter motor, the autotensioner is locked so as not to be contractible to avoid the above-mentioned problems.

FIG. 10 is a longitudinal sectional view of the above-mentioned conventional automatic tensioner. The tensioner main body 01 is formed by slidably fitting an upper housing 02 and a lower housing 03, and an upper housing 02 and a lower housing 03. Are urged by springs 04 in directions away from each other, and the elastic force of the springs 04 acts in the direction of applying tension to the belt. A piston 06 integrally formed with the upper housing 02 is slidably fitted into a cylinder 05 integrally formed with the lower housing 03. First liquid chamber 0 partitioned by cylinder 05 and piston 06
7 and a second liquid chamber 08 partitioned outside the cylinder 05 are connected via a first communication passage 09 and a second communication passage 010 formed in the lower housing 03, and the first liquid chamber 0
The liquid is sealed in 7 and the second liquid chamber 08.

A first check valve 011 is provided in the first communication passage 09.
Is provided, the movement of the liquid from the first liquid chamber 07 to the second liquid chamber 08 is restricted by the first check valve 011 and the movement of the liquid in the opposite direction is allowed. A second check valve 012 and a throttle 013 are provided in the second communication passage 010, and the movement of the liquid from the first liquid chamber 07 to the second liquid chamber 08 is restricted by the second check valve 012. Liquid movement in the opposite direction is allowed. Second check valve 0
A rod-shaped valve body driving member 017 driven by a solenoid 016 faces the valve body 014 in order to separate the 12 valve bodies 014 from the valve seat 015.

In the normal state, the solenoid 016 is demagnetized to correctively raise the valve body driving member 017 to move the valve body 014 away from the valve seat 015, whereby the second check valve 012 is released.
Is kept open. Therefore, tensioner body 01
The liquid extruded from the first liquid chamber 07 in which the volume is reduced and the volume is reduced passes through the second communication passage 010 having the second check valve 012 and the throttle 013 and flows into the second liquid chamber 08.
At that time, the damping force is exerted by the flow resistance of the liquid passing through the throttle 013. When the tensioner main body 01 extends, the second
The liquid in the liquid chamber 08 is returned to the first liquid chamber 07 via the first communication passage 09 having the first check valve 011.

When the motor / generator is used as a starter motor when starting the engine, the solenoid 01
The second check valve 012 is made to function by exciting 6 to lower the valve body drive member 017. When the tension of the belt is sharply increased by the operation of the motor / generator and the tensioner main body 01 is strongly compressed, the first check valve 0
Since 11 and the second check valve 012 are both closed to prevent the liquid from flowing out of the first liquid chamber 07, the tensioner main body 01 is locked so as not to be contractable and the belt is prevented from swaying.

[0008]

By the way, when the motor / generator is used as a starter motor when the engine is started, the valve body 018 of the first check valve 011 strongly collides with the valve seat 019 and the second check valve 012 is used. Since the valve body 014 strongly collides with the valve seat 015, there is a problem that wear and damage occur at the contact portion and the durability is reduced. To avoid this, valve bodies 014 and 018 and valve seat 0
It is necessary to form 15,019 with a special material or to carry out a special surface treatment, which causes a problem of increasing cost.

The present invention has been made in view of the above circumstances, and in an auto tensioner for an accessory drive belt, deterioration of valve durability when a motor / generator as an accessory is used as a starter motor is minimized. The goal is to keep

[0010]

In order to achieve the above object, according to the invention described in claim 1, tension is applied to an endless transmission band for driving auxiliary machinery of an engine including at least a motor generator. To do so, the tensioner body that can expand and contract according to the tension of the endless transmission band, the spring that biases the tensioner body in the extension direction, the volume shrinks as the tensioner body shrinks, and the volume expands as it extends. A first liquid chamber, a second liquid chamber connected to the first liquid chamber via a first communication passage and a second communication passage, and a second liquid chamber disposed in the first communication passage to move from the second liquid chamber to the first liquid chamber In the autotensioner device including the check valve that allows only the movement of the liquid and the on-off valve that opens and closes the second communication passage, the on-off valve can be seated on the valve seat and the valve seat from the second liquid chamber side. Valve body and forcefully seat the valve body on the valve seat And body drive member, an auto tensioner is proposed which is characterized in that an actuator for driving the valve body driving member.

According to the above construction, the valve body driving member is normally in the inoperative position for opening the on-off valve, and the tensioner body contracts due to the increase in the tension of the endless transmission band, so that the volume of the first liquid chamber is reduced. At this time, the check valve in the first communication passage is closed, so that the liquid in the first liquid chamber passes through the opened / closed valve in the second communication passage and flows into the second liquid chamber. The attenuating force prevents the tensioner body from abruptly contracting. When the tension of the endless transmission band decreases, the tensioner body expands due to the elastic force of the spring and the volume of the first liquid chamber increases, so that the liquid in the second liquid chamber opens the check valve in the first communication passage. Then, it flows into the first liquid chamber.

When the motor / generator is driven as a starter motor to start the engine, a strong tension momentarily acts on the endless transmission band to cause the tensioner body to contract abruptly, and the tensioner body to abruptly expand due to the subsequent reaction. Therefore, there is a possibility that the endless power transmission band will be violent due to a sudden change in tension. Therefore, when the motor / generator is driven as a starter motor, the actuator is operated to forcibly seat the valve body on the valve seat by the valve body drive member, thereby restricting the outflow of the liquid from the first liquid chamber. As a result, the tensioner main body can be locked so as not to contract, and it is possible to prevent the endless transmission belt from violently changing due to a sudden change in tension. Moreover, since the valve element of the on-off valve is forcibly seated on the valve seat by the valve element drive member, it is possible to prevent the valve element from strongly colliding with the valve seat due to hydraulic pressure and improve the durability of the on-off valve. You can

According to the invention described in claim 2,
In addition to the configuration of claim 1, an autotensioner device is proposed, wherein the actuator is a motor, and the valve body driving member is driven by the motor via a screw mechanism.

According to the above construction, since the valve body driving member is driven by the actuator composed of the motor through the screw mechanism, the hydraulic load acting on the valve body is blocked by the screw mechanism so that the hydraulic load is not reversely transmitted to the actuator. It is possible to reduce the size of the actuator and improve the durability.

According to the invention described in claim 3,
In addition to the configuration of claim 1, an autotensioner device is proposed, wherein the actuator is a motor, and the valve body driving member is driven by the motor via a worm gear mechanism.

According to the above construction, since the actuator composed of the motor drives the valve element driving member through the worm gear mechanism, the hydraulic load acting on the valve element is blocked by the worm gear mechanism so that it is not reversely transmitted to the actuator. It is possible to reduce the size of the actuator and improve the durability.

According to the invention described in claim 4,
A tensioner body that is expandable and contractible according to the tension of the endless transmission band to apply tension to the endless transmission band that drives auxiliary machinery of the engine including at least a motor generator, and a spring that biases the tensioner body in the extension direction. , A first liquid chamber whose volume decreases as the tensioner main body contracts and which expands as it extends, and a second liquid which is connected to the first liquid chamber via a first communication passage and a second communication passage. An automatic tensioner device including a chamber, a check valve that is arranged in the first communication passage and allows only liquid to move from the second liquid chamber to the first liquid chamber, and an on-off valve that opens and closes the second communication passage An automatic tensioner device is proposed in which the on-off valve is a rotary valve driven by an actuator.

According to the above construction, when the rotary valve is normally opened by the actuator and the tensioner main body contracts due to the increase in the tension of the endless transmission band and the volume of the first liquid chamber is reduced, the first continuous chamber is reduced. When the check valve in the passage is closed, the liquid in the first liquid chamber passes through the open / close valve in the second communication passage and flows into the second liquid chamber, and the damping force generated at that time causes the tensioner body to move. Abrupt contraction is prevented. When the tension of the endless transmission belt decreases, the tensioner body extends due to the elastic force of the spring and the volume of the first liquid chamber increases,
The liquid in the second liquid chamber flows into the first liquid chamber by opening the check valve in the first communication passage.

When the motor / generator is driven as a starter motor to start the engine, a strong tension momentarily acts on the endless transmission band to cause the tensioner body to contract abruptly, and the tensioner body to abruptly expand due to the subsequent reaction. Therefore, there is a possibility that the endless power transmission band will be violent due to a sudden change in tension. Therefore, when the motor / generator is driven as a starter motor, the rotary valve is forcibly closed by the actuator, thereby restricting the outflow of liquid from the first liquid chamber and locking the tensioner body so that it cannot contract. It is possible to prevent the endless power transmission band from violently changing due to a sudden change in tension. Moreover, since the on-off valve is a rotary valve, the valve body and the valve seat do not collide with each other, and the durability of the on-off valve can be improved. Further, since the rotary valve is used, the hydraulic load is not reversely transmitted to the actuator, so that the actuator can be downsized and the durability can be improved.

The belt 28 of the embodiment corresponds to the endless transmission belt of the present invention, and the solenoid 66 and the motor 7 of the embodiment are used.
2 corresponds to the actuator of the present invention.

[0021] [Detailed Description of the Invention]

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on the embodiments of the present invention shown in the accompanying drawings.

1 and 2 show a first embodiment of the present invention. FIG. 1 is a front view of an engine for a hybrid vehicle, and FIG. 2 is an enlarged sectional view of part 2 of FIG.

As shown in FIG. 1, an engine E for a hybrid vehicle includes an accessory bracket 12 attached to a side surface of an engine block 11, and the accessory bracket 12
An air conditioning compressor 13, a water pump 14, a motor / generator 15, an idler pulley 16 and an auto tensioner 17 are supported by the. A pulley 19 provided on a crankshaft 18 of the engine E, a pulley 21 provided on a rotary shaft 20 of the air conditioning compressor 13, a pulley 23 provided on a rotary shaft 22 of the water pump 14, a motor
A pulley 25 provided on the rotary shaft 24 of the generator 15,
A belt 28 as an endless transmission band is wound around the idler pulley 16 provided on the rotary shaft 26 and the tensioner pulley 27 provided on the auto tensioner 17. Pulley 1
The rotation methods of 9, the pulley 21, the pulley 23, the pulley 25, the idler pulley 16 and the tensioner pulley 27 are indicated by arrows.

The automatic tensioner 17 is provided with a retractable tensioner body 29, the upper end of which is pivotally supported by the accessory bracket 12 via a fulcrum pin 30. An intermediate portion of a bell crank 32 is pivotally supported on the accessory bracket 12 via a fulcrum pin 31, and one end of the bell crank 32 is pivotally supported on a lower end of the tensioner main body 29 via a pin 33.
The tensioner pulley 26 is pivotally supported on the other end of the bell crank 32 via a rotary shaft 34.

The engine controller 36, to which a signal from the crank pulse sensor 35 for detecting the rotational position of the crankshaft 18 is input, controls the fuel injection timing of the fuel injection valve 37 and the ignition timing of the ignition plug 38. Further, the engine controller 36 controls the operation of the motor / generator 15 via the motor controller 39 and the inverter 40, and also controls the operation of the auto tensioner 27.

As shown in FIG. 2, the auto tensioner 17
The tensioner main body 29 of the bell crank 3 is attached to the inner peripheral surface of the upper housing 51 connected to the accessory bracket 12.
The outer peripheral surface of the lower housing 52 connected to 2 is slidably fitted, and the piston 54 integrally formed in the upper housing 51 is slidably fitted in the cylinder 53 integrally formed in the lower housing 52. To do. Cylinder 53
And first liquid chamber 55 partitioned by piston 54
And a second liquid chamber 56 partitioned outside the cylinder 53 are connected via a first communication passage 57 and a second communication passage 58 formed in the lower housing 52, and all of the first liquid chamber 55 and The liquid is sealed in a part of the second liquid chamber 56. When the tensioner main body 29 contracts, the volume of the first liquid chamber 55 decreases, and when the tensioner main body 29 extends, the volume of the first liquid chamber 55 increases.

The upper housing 51 and the lower housing 52 are urged by a spring 59 housed in the second liquid chamber 56 in a direction away from each other (that is, a direction in which the tensioner body 29 extends), and the spring 59 springs. The force acts in a direction in which the tensioner pulley 27 is pressed against the belt 28 to apply tension.

A check valve 62 composed of a conical valve seat 60 and a spherical valve body 61 is provided in the first communication passage 57, and the check valve 62 moves from the first liquid chamber 55 to the second liquid chamber 56. The movement of the liquid is regulated, and the movement of the liquid in the opposite direction is allowed. In the second communication passage 58, a conical valve seat 63, a spherical valve body 64, and a rod-shaped valve body drive member 65.
And an on-off valve 67 including a solenoid 66 and a throttle 68
And are provided. Solenoid 6 as actuator
When 6 is demagnetized, the valve body drive member 65 descends, the valve body 64 separates from the valve seat 63, and the on-off valve 67 functions as a check valve. In this state, from the first liquid chamber 55 to the second
The movement of the liquid to the liquid chamber 56 is allowed, and the movement of the liquid in the opposite direction is restricted. When the solenoid 66 is excited, the valve body driving member 65 rises and the valve body 64 is forcibly seated on the valve seat 63, and the on-off valve 67 is closed to prevent the liquid from moving in any direction.

Next, the operation of the first embodiment of the present invention having the above construction will be described.

On-off valve 67 during normal operation of engine E
Solenoid 66 is in a demagnetized state, and valve body drive member 65
And the valve element 64 separates from the valve seat 63, the on-off valve 67 exhibits a function as a check valve. For example, the tension of the belt 28 at the position of the auto tensioner 17 decreases when the engine E accelerates and increases when the engine E decelerates. The tension of the belt 28 decreases as the load on the air conditioning compressor 13, the water pump 14 or the motor generator 15 increases, and increases as the load decreases.

When the tension of the belt 28 is increased in this way, the load acting on the tensioner pulley 27 from the belt 28 is transmitted to the tensioner main body 29 of the automatic tensioner 17 via the bell crank 32, and the tensioner main body 29 is contracted. I will try to let you. As a result, the lower housing 52 is pushed into the upper housing 51 against the elastic force of the spring 59, the volume of the first liquid chamber 55 decreases, and the check valve 62 closes to close the first communication passage 57. The liquid in the first liquid chamber 55 is
It passes through the open / close valve 67 and the throttle 68 of the communication passage 58 and slowly flows into the second liquid chamber 56, and the increase in the tension of the belt 28 is suppressed.

On the other hand, when the tension of the belt 28 is reduced, the load transmitted from the belt 28 to the tensioner main body 29 is reduced, so that the lower housing 52 is pushed out of the upper housing 51 by the elastic force of the spring 59. As a result, the volume of the first oil chamber 55 increases. At this time, the opening / closing valve 67 functioning as a check valve is closed and the second communication passage 58 is closed, so that the liquid in the second liquid chamber 56 becomes first.
After passing through the opened check valve 62 of the communication passage 57, it quickly flows into the first liquid chamber 55, and the decrease in the tension of the belt 28 is suppressed.

As described above, when the tension of the belt 28 tries to increase or decrease, the auto tensioner 1 compensates for the tension.
By expanding and contracting the tensioner main body 29 of No. 7, it is possible to maintain the tension of the belt 28 substantially constant and enable stable power transmission.

By the way, the engine E of the hybrid vehicle
Is automatically stopped when the vehicle is stopped, and is automatically started when the vehicle starts. The start is performed by causing the motor / generator 15, which normally functions as a generator, to function as a starter motor.

When the motor / generator 15 is driven to rotate the pulley 25 in the direction of the arrow in order to start the engine E, the tension of the belt 28 rapidly increases at the position of the auto tensioner 17, so that the tensioner main body 29 temporarily moves. Since the elastic force of the spring 59 causes the belt 28 to rapidly expand after the contraction, the belt 28 may be violated and the power transmission may become unstable. Therefore, in the present embodiment, when the engine E is started, the solenoid 66 of the opening / closing valve 67 is excited in advance to start the valve body drive member 6
5, the valve body 64 is forcedly seated on the valve seat 63, and the on-off valve 67 is closed. As a result, both the check valve 62 and the on-off valve 67 prevent the liquid in the first liquid chamber 55 from being sealed, so that the tensioner main body 29 is locked so that it cannot contract and the belt 28 is prevented from swaying.

Now, when the motor / generator 15 is driven and the hydraulic pressure in the first liquid chamber 55 rapidly increases, the valve body 61 of the check valve 62 collides with the valve seat 60, so that its durability is secured. Therefore, it is necessary to consider the materials of the valve body 61 and the valve seat 60. On the other hand, since the valve body 64 of the on-off valve 67 is forcedly seated on the valve seat 63, the valve body 6
4 and the valve seat 63 do not collide with each other, so that it is not necessary to consider the material and the like in order to secure the durability, which can contribute to the cost reduction.

That is, the conventional one described with reference to FIG. 10 requires special consideration for ensuring the durability of both of the two check valves 011 and 012. No need to consider.

By the way, in the first embodiment, since the valve body 64 is forcibly seated on the valve seat 63 by the urging force of the solenoid 66, it withstands the high hydraulic pressure generated by the drive of the motor generator 15. A high power solenoid 66 is required. In each of the embodiments described below, the load on the actuator that drives the on-off valve 67 is reduced.

In the second embodiment shown in FIG. 3, the nut member 71 provided at the lower end of the valve body driving member 65 for pushing up the valve body 64 of the on-off valve 67 is slidable in the guide hole 52a formed in the lower housing 52. Mated, lower housing 5
Motor 72 as an actuator fixed to the lower surface of 2
Is formed on the outer circumference of the output shaft 72a of the nut member 7
It is screwed to 1.

Therefore, by driving the motor 72 and raising the valve body driving member 65 integrated with the nut member 71, the valve body 64 can be pushed up and forcibly seated on the valve seat 63. The screw mechanism 73 configured by the output shaft 72a of the motor 72 and the nut member 71 is an irreversible transmission mechanism, and has a function of blocking the power transmission from the valve body driving member 65 side to the motor 72 side. Small output can be used.

In the second embodiment, the valve element driving member 65 and the spherical valve element 64 are formed as separate members, but in the third embodiment shown in FIG. 4, the needle-shaped upper end of the valve element driving member 65 is formed. The valve body 64 is integrally formed. By changing the gap between the tapered valve body 64 and the valve seat 63 by the movement of the valve body 64, the opening degree of the opening / closing valve 67 can be subtly changed and the damping force can be arbitrarily adjusted.

Although the screw mechanism 73 is adopted as the irreversible transmission mechanism in the third embodiment, the structure of the irreversible transmission mechanism is different in the fourth embodiment shown in FIG. That is, the guide hole 52
The pinion 75 meshes with the rack 74 that is integrally provided at the bottom of the guide member 70 that slidably fits into the a, and the motor 7 is attached to the worm wheel 76 that is provided coaxially with the pinion 75.
The worm 77 rotating by 2 meshes. Therefore, the rotation of the motor 72 is performed by the worm 77 and the worm wheel 7.
6, the pinion 75, the rack 74 and the guide member 70 are transmitted to the valve body drive member 65. Worm gear mechanism 7 including worm 77 and worm wheel 76
8 constitutes an irreversible transmission mechanism, which blocks the transmission of power from the valve element drive member 65 side to the motor 72 side, so that a small and small output motor 72 can be used.

In the fifth embodiment shown in FIGS. 6 and 7, the on-off valve 67 is constituted by a rotary valve having a rotor 79 which is rotationally driven by a motor 72. A through hole 79a penetrates through the rotor 79, and the second communication passage 58 can be opened or closed depending on the rotational position. Also in this embodiment, the load of the motor 72 can be reduced by configuring the rotary valve as an irreversible transmission mechanism.

In the sixth embodiment shown in FIGS. 8 and 9, a notch 79b extending in the circumferential direction is formed at one end of the through hole 79a of the rotor 79 of the opening / closing valve 67. This notch 79b
By devising the shape of, the opening degree of the opening / closing valve 67 can be subtly changed and the damping force can be arbitrarily adjusted. Also in this embodiment, the load of the motor 72 can be reduced by configuring the rotary valve as an irreversible transmission mechanism.

Also in the second to sixth embodiments described above, since the collision between the valve body 64 and the valve seat 63 does not occur in the opening / closing valve 67, it is necessary to consider a special material or the like to ensure durability. Can be eliminated to contribute to cost reduction.

Although the embodiments of the present invention have been described in detail above, the present invention can be modified in various ways without departing from the scope of the invention.

[0048]

As described above, according to the invention described in claim 1, when the motor / generator is driven as a starter motor to start the engine, a strong tension momentarily acts on the endless transmission band. Since the tensioner main body contracts rapidly and the tensioner main body expands abruptly due to the subsequent reaction, there is a possibility that the endless transmission band will be violent due to a sudden change in tension. Therefore, when the motor / generator is driven as a starter motor, the actuator is operated to forcibly seat the valve body on the valve seat by the valve body drive member, thereby restricting the outflow of the liquid from the first liquid chamber. As a result, the tensioner main body can be locked so as not to contract, and it is possible to prevent the endless transmission belt from violently changing due to a sudden change in tension. Moreover, since the valve element of the on-off valve is forcibly seated on the valve seat by the valve element drive member, it is possible to prevent the valve element from strongly colliding with the valve seat due to hydraulic pressure and improve the durability of the on-off valve. You can

According to the invention described in claim 2,
Since the actuator composed of the motor drives the valve element driving member via the screw mechanism, the hydraulic load acting on the valve element is blocked by the screw mechanism so as not to be reversely transmitted to the actuator, thereby reducing the size and durability of the actuator. It is possible to improve.

According to the invention described in claim 3,
Since the actuator composed of the motor drives the valve body driving member via the worm gear mechanism, the worm gear mechanism prevents the hydraulic load acting on the valve body from being reversely transmitted to the actuator, thereby reducing the size and durability of the actuator. It is possible to improve.

According to the invention described in claim 4,
When the motor / generator is driven as a starter motor and the engine is started, a strong tension momentarily acts on the endless transmission band to cause the tensioner body to contract abruptly and the tensioner body to expand abruptly due to the subsequent reaction. Sudden fluctuations in tension may cause the endless transmission band to run wild. Therefore, when the motor / generator is driven as a starter motor, the rotary valve is forcibly closed by the actuator, thereby restricting the outflow of liquid from the first liquid chamber and locking the tensioner body so that it cannot contract. It is possible to prevent the endless power transmission band from violently changing due to a sudden change in tension. Moreover, since the on-off valve is a rotary valve, the valve body and the valve seat do not collide with each other, and the durability of the on-off valve can be improved. Further, since the rotary valve is used, the hydraulic load is not reversely transmitted to the actuator, so that the actuator can be downsized and the durability can be improved.

[Brief description of drawings]

FIG. 1 is a front view of an engine for a hybrid vehicle.

FIG. 2 is an enlarged sectional view of part 2 in FIG.

FIG. 3 is a diagram corresponding to FIG. 2 according to a second embodiment of the present invention.

FIG. 4 is a diagram corresponding to FIG. 2 according to a third embodiment of the present invention.

FIG. 5 is a view corresponding to FIG. 2 according to a fourth embodiment of the present invention.

FIG. 6 is a diagram corresponding to FIG. 2 according to a fifth embodiment of the present invention.

7 is a sectional view taken along line 7-7 of FIG.

FIG. 8 is a diagram corresponding to FIG. 2 according to a sixth embodiment of the present invention.

9 is a sectional view taken along line 9-9 of FIG.

FIG. 10 is a vertical sectional view of a conventional auto tensioner.

[Explanation of symbols]

15 Motor generator 28 belts (endless transmission belt) 29 Tensioner body 55 First liquid chamber 56 Second liquid chamber 57 First communication passage 58 2nd passage 59 spring 62 check valve 63 valve seat 64 valve 65 Valve body drive member 66 Solenoid (actuator) 67 on-off valve 68 Aperture 72 Motor (actuator) 73 screw mechanism 78 worm gear mechanism

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Soichi Sugino             1-4-1 Chuo Stock Market, Wako City, Saitama Prefecture             Inside Honda Research Laboratory (72) Inventor Tsukasa Takahashi             1-4-1 Chuo Stock Market, Wako City, Saitama Prefecture             Inside Honda Research Laboratory (72) Inventor Shogo Yonemoto             1-4-1 Chuo Stock Market, Wako City, Saitama Prefecture             Inside Honda Research Laboratory F term (reference) 3J049 AA01 BB05 BB13 BB17 BB23                       BB26 BB35 BC04 BC08 BC10                       BG03 CA03 CA04

Claims (4)

[Claims] 1. At least a motor generator (1
The tensioner main body (29) that is expandable and contractible according to the tension of the endless transmission band (28) in order to apply tension to the endless transmission band (28) that drives the auxiliary machinery of the engine (E) including 5). The spring (59) for urging the main body (29) in the extension direction and the volume of the tensioner main body (29) are reduced as the tensioner main body (29) contracts.
A first liquid chamber (55) whose volume increases as it extends, and a second liquid chamber connected to the first liquid chamber (55) via a first communication passage (57) and a second communication passage (58). (56), a check valve (62) arranged in the first communication passage (57) and allowing only the movement of the liquid from the second liquid chamber (56) to the first liquid chamber (55), and the second communication An on-off valve (67) for opening and closing a passage (58), comprising:
7) is a valve seat (63), a valve body (64) that can be seated on the valve seat (63) from the second liquid chamber (56) side, and the valve body (64) is forced to the valve seat (63). Valve body drive member (6
5) and an actuator (66, 72) for driving the valve element drive member (65), an autotensioner device characterized by the above-mentioned. 2. The auto according to claim 1, wherein the actuator (72) is a motor, and the valve body driving member (65) is driven by a motor through a screw mechanism (73). Tensioner device. 3. The auto according to claim 1, wherein the actuator (72) is a motor, and the valve body driving member (65) is driven by a motor through a worm gear mechanism (78). Tensioner device. 4. At least a motor generator (1
The tensioner main body (29) that is expandable and contractible according to the tension of the endless transmission band (28) in order to apply tension to the endless transmission band (28) that drives the auxiliary machinery of the engine (E) including 5). The spring (59) for urging the main body (29) in the extension direction and the volume of the tensioner main body (29) are reduced as the tensioner main body (29) contracts.
A first liquid chamber (55) whose volume increases as it extends, and a second liquid chamber connected to the first liquid chamber (55) via a first communication passage (57) and a second communication passage (58). (56), a check valve (62) arranged in the first communication passage (57) and allowing only the movement of the liquid from the second liquid chamber (56) to the first liquid chamber (55), and the second communication An on-off valve (67) for opening and closing a passage (58), comprising: an on-off valve (67), wherein the on-off valve (67) is a rotary valve driven by an actuator (72).