JP6627458B2 - Belt type power transmission - Google Patents

Description

  The present disclosure relates to a belt-type power transmission device.

  In Patent Document 1, a rotating shaft of an ISG (Integrated Starter Generator) is provided so as to be parallel to an output shaft of an engine, and a crank pulley provided on an output shaft of the engine and an ISG pulley provided on a rotating shaft of the ISG. And a belt-type power transmission device in which a belt is wound. In such a belt-type power transmission device, a pendulum-type belt tensioner is provided to adjust the tension of the belt. The pendulum type belt tensioner is provided so as to be able to swing around the same rotation axis as the ISG pulley, and the belt pulley has one side portion extending on one side of the crank pulley and the ISG pulley and the other side portion extending on the other side of the belt outside the belt. Pressing from.

  Further, in such a belt type power transmission device, the tension of one side portion or the other side portion of the belt fluctuates due to the fluctuation of the rotation state of the crank pulley and the ISG pulley. When the tension on one side increases, the pendulum type belt tensioner rotates, the pressing force on one side by the pendulum type belt tensioner decreases, and the pressing force on the other side by the pendulum type belt tensioner increases. The tension on the side part is low and the tension on the other side part is high. Also, when the tension on the other side increases, the pendulum type belt tensioner rotates, and the pressing force on the other side by the pendulum type belt tensioner decreases, and the pressing force on the one side by the pendulum type belt tensioner increases. , The tension on the other side becomes lower and the tension on the one side becomes higher. Thereby, the tension of the one side portion and the other side portion of the belt is appropriately maintained. Therefore, compared to a configuration in which a pendulum type belt tensioner is not provided, even if the tension of the belt is set lower, it is possible to transmit power more favorably between the crank pulley and the ISG pulley.

  In such a belt-type power transmission device, when the engine is started, the power running control for power running the ISG is executed by the ECU so that the ISG can be used as a starter of the engine. In the power generation control, the target regenerative torque of ISG (the target value of the regenerative torque) is set by the ECU based on the vehicle speed and the like.

JP 2015-67225 A

In the belt-type power transmission device disclosed in Patent Literature 1, when the engine is started, the belt tension increases on the entrance side to the ISG and decreases on the exit side from the ISG. The fluctuation is large and the belt is likely to shift in the crankshaft direction. Also, at the start of ISG power generation, the belt tension decreases at the entrance side of the ISG and increases at the exit side of the ISG, so that the belt tension fluctuation is large and the belt shifts in the crankshaft direction. Tends to occur.
If such a state is left, it is assumed that the belt may be damaged and the belt may be broken.

  In view of the above circumstances, at least one embodiment of the present invention aims to provide a belt-type power transmission device that can effectively prevent a belt from shifting in a crankshaft direction.

(1) A belt-type power transmission device according to at least one embodiment of the present invention includes a crank pulley provided on a crankshaft of an engine, a rotary pulley provided on a rotation shaft of a starter generator, the crank pulley, and the rotation. A belt wrapped around a pulley and circulating in one direction between the crank pulley and the rotary pulley; and a swingable centering on the same rotation axis as the rotary pulley, and an upstream side of the rotary pulley. And a pendulum-type belt tensioner having a tension pulley rotatable on each of a downstream side and a downstream side, between the crank pulley and the upstream tension pulley which is a tension side when the engine is started. A guide is provided in one side area facing the side surface of the belt.

  According to the above configuration (1), a guide is provided between the crank pulley and the tension pulley on the upstream side, which is a tension side when the engine is started, so as to oppose the side surface of the belt in at least one lateral region of the belt. In particular, it is possible to suppress belt runaway between the crank pulley and the upstream tension pulley where the fluctuation of the tension becomes large particularly when the engine is started. This suppresses the belt runaway in which the fluctuation of the tension becomes large when the engine is started, and can effectively prevent the belt from shifting in the crank direction between the crank pulley and the tension pulley on the upstream side.

(2) In some embodiments, in the configuration of (1), the guide includes a first guide provided on an opposite side of the engine block configuring the engine with the belt interposed therebetween.
According to the above configuration (2), since the guide includes the first guide provided on the opposite side of the engine block of the engine and the belt, the guide is provided on the opposite side of the engine block and the belt of the engine. Of the belt can be suppressed.

(3) In some embodiments, in the above configuration (2), the first guide extends from an open end of a fixed shaft that rotatably supports the upstream tension pulley.
According to the above configuration (3), the first guide extends from the open end of the fixed shaft that rotatably supports the upstream tension pulley, so that the first guide swings together with the fixed shaft. Thus, the first guide follows the tension pulley on the upstream side, and it is possible to suppress the belt from running over a wide area.

(4) In some embodiments, in the configuration of (3), the guide includes a second guide extending from a fixed end of the fixed shaft along the engine block.
According to the configuration of (4), since the guide includes the second guide extending from the fixed end of the fixed shaft to the engine block side, it is possible to suppress the belt from running on the engine block side. Further, since the second guide swings together with the fixed shaft, the second guide follows the tension pulley on the upstream side, so that the belt can be prevented from running over a wide area.

(5) In some embodiments, in the configuration of (1), the guide is provided integrally on at least one side surface of the tension pulley on the upstream side.
According to the configuration (5), since the guide is provided integrally with at least one side surface of the tension pulley on the upstream side, the guide can be provided at low cost.

(6) In some embodiments, in the configuration according to any one of (1) to (5), the starter generator supplies power for starting the engine from the rotating shaft to the crankshaft, Electric power is generated by the power transmitted from the crankshaft to the rotating shaft.
According to the configuration of (6), the starter generator supplies power for starting the engine from the rotating shaft to the crankshaft, while generating power using the power transmitted from the crankshaft to the rotating shaft, so that energy can be efficiently consumed. Can be used.

(7) In some embodiments, in any one of the above (1) to (6), an air conditioner provided on a drive shaft of a compressor between the tension pulley on the downstream side and the crank pulley. It has a pulley.
According to the configuration (7), since the air conditioner pulley provided on the drive shaft of the compressor is provided between the tension pulley and the crank pulley on the downstream side, the power of the engine can be transmitted to the compressor.

  According to at least one embodiment of the present invention, it is possible to effectively prevent the belt from shifting in the crankshaft direction.

It is a perspective view showing the outline of the belt type power transmission device concerning an embodiment of the present invention. FIG. 3 is a conceptual diagram illustrating a state of a belt-type power transmission device when a starter generator is performing a steady operation. FIG. 3 is a conceptual diagram showing a state of a belt-type power transmission device when a starter generator starts a start assist. FIG. 4 is a conceptual diagram showing a state of a belt-type power transmission device when a starter generator starts regeneration. It is a figure showing the outline of the guide concerning one embodiment. It is a figure showing the outline of the guide concerning one embodiment. It is a figure showing the outline of the guide concerning one embodiment. It is a figure showing the outline of the guide concerning one embodiment. It is a figure showing the outline of the guide concerning one embodiment.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. Absent.
For example, expressions representing relative or absolute arrangement such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly described. In addition to such an arrangement, it is also possible to represent a state of being relatively displaced with a tolerance or an angle or a distance at which the same function can be obtained.
Also, for example, an expression representing a shape such as a square shape or a cylindrical shape not only represents a shape such as a square shape or a cylindrical shape in a strictly geometrical sense, but also a concave and convex portion as long as the same effect can be obtained. A shape including a chamfered portion and the like is also represented.
On the other hand, the expression “comprising”, “comprising”, “including”, “including”, or “having” of one component is not an exclusive expression excluding the existence of another component.

  FIG. 1 is a perspective view schematically showing a belt-type power transmission device 1 according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a state of the belt-type power transmission device 1 when the starter generator 3 is performing a steady operation, and FIG. 3 is a diagram illustrating the state of the belt-type power transmission device 1 when the starter generator 3 starts the start assist. It is a figure showing a state. FIG. 4 is a diagram illustrating a state of the belt-type power transmission device 1 when the regeneration of the starter generator 3 is started.

  As shown in FIG. 1, a belt-type power transmission device 1 according to an embodiment of the present invention transmits power from a starter generator 3 to the engine 2 when the engine 2 starts, and transmits the power from the engine 2 after the engine 2 starts. Power is transmitted to a compressor 3 and a compressor 4 of the air conditioner (hereinafter simply referred to as “compressor 4”).

  The rotating shaft 31 of the starter generator 3 and the driving shaft 41 of the compressor 4 are arranged in parallel with the crankshaft 21 of the engine 2, the crank pulley 22 provided on the crankshaft 21, the rotating pulley 32 provided on the rotating shaft 31, A belt 5 circulating in one direction is wound around an air conditioner pulley 42 provided on the drive shaft 41.

  Thus, when the engine 2 is started, the starter generator 3 is driven, and the belt 5 circulates clockwise toward the engine 2, whereby power is transmitted from the rotation shaft 31 of the starter generator 3 to the crankshaft 21 of the engine 2. You. Therefore, as shown in FIG. 3, when the engine 2 is started, the belt 5 has the tension side on the upstream side of the rotary pulley 32 and the slack side on the downstream side of the rotary pulley 32.

  After the engine 2 is started, the power is transmitted from the crankshaft 21 of the engine 2 to the rotation shaft 31 of the starter generator 3 and the drive shaft 41 of the compressor 4 by circulating the belt 5 clockwise toward the engine 2. Is done. Thereby, the kinetic energy of the engine 2 can be regenerated into electric energy.

  Then, when the starter generator 3 starts regeneration, as shown in FIG. 4, the belt 5 has a slack side on the upstream side of the rotary pulley 32 and a tight side on the downstream side of the rotary pulley 32. Then, when a certain period of time elapses after the starter generator 3 starts regeneration, as shown in FIG. 2, the belt-type power transmission device 1 enters a steady state.

  Further, the belt type power transmission device 1 according to the present embodiment includes a pendulum type belt tensioner 6. The pendulum type belt tensioner 6 is for adjusting the tension of the belt 5 having a large fluctuation in tension. The pendulum type belt tensioner 6 according to the present embodiment can swing about the same rotation axis as the rotary pulley 32. Is provided.

  The pendulum type belt tensioner 6 has tension pulleys 61 and 62 that are rotatable on the upstream and downstream sides of the rotary pulley 32, respectively. The tension pulley 61 on the upstream side is on the tension side of the belt 5 when the engine 2 is started, and is on the slack side of the belt 5 when the starter generator 3 is regenerated. On the other hand, the tension pulley 62 on the downstream side becomes the slack side of the belt 5 when the engine 2 starts, and becomes the tight side of the belt 5 when the starter generator 3 regenerates.

  Thus, the tension pulley 61 on the upstream side is pushed up by the belt 5 due to the tension of the belt 5 when the engine 2 is started, and pushes down the belt 5 to absorb the slack of the belt 5 when the starter generator 3 regenerates. On the other hand, the tension pulley 62 on the downstream side pushes down the belt 5 to absorb the slack of the belt 5 when the engine 2 starts, and pushes up the belt 5 due to the tension of the belt 5 when the starter generator 3 regenerates.

  By the way, since the tension applied to the belt 5 at the time of starting the engine 2 is larger than the fluctuation at the time of regeneration of the starter generator, the crank pulley 22 and the tension pulley 52 which is the belt tightening side at the time of starting the engine 2 It is required to suppress the belt 5 from running up during the period.

  As shown in FIGS. 5 to 9, the belt-type power transmission device 1 according to the present embodiment includes the guide 7 between the crank pulley 22 and the tension pulley 61 on the upstream side. The guide 7 faces the side surface of the belt 5 in at least one side area of the belt 5.

  The guide 7 is not limited to a fan shape as viewed from the side as shown in FIGS. 5 to 8 as long as the guide 7 faces the side surface of the belt 5 in at least one side area of the belt 5. An appropriate shape such as a circle and a semicircle can be adopted. Further, the present invention is not limited to a plate-like one as shown in FIGS.

  For example, the guide 7 shown in FIGS. 5 to 7 includes a first guide 71 provided on an opposite side of the engine block constituting the engine 2 with the belt 5 interposed therebetween. In this way, it is possible to prevent the belt 5 from running out on the opposite side of the engine block constituting the engine 2 with respect to the belt 5.

  For example, the first guide 71 is formed of a plate-like body, and extends from the open end of the fixed shaft 63 that rotatably supports the tension pulley 61 on the upstream side. By doing so, the first guide 71 swings together with the fixed shaft 63, so that the first guide 71 follows the tension pulley 61 on the upstream side, and it is possible to suppress the belt 5 from running over a wide area. .

For example, the guide 7 shown in FIGS. 6 and 7 further includes a second guide 72 extending from the fixed end of the fixed shaft 63 along the engine block constituting the engine 2. By doing so, it is possible to suppress the belt 5 from running up on the engine block side. In addition, since the second guide 72 swings together with the fixed shaft 63, the second guide 72 follows the tension pulley 61 on the upstream side, so that the belt 5 can be prevented from running over a wide area.
For example, the second guide 72 is formed of a plate-like body, and is attached to a bracket on which the fixed shaft 63 is provided. In this way, the second guide 72 can be provided without modifying the pendulum type belt tensioner 6.

  For example, the guide 7 shown in FIG. 7 includes a connecting rod 73 that connects the first guide 71 and the second guide 72. By doing so, the first guide 71 and the second guide 72 are connected by the connecting rod 73, and the first guide 71 and the second guide 72 are more firmly attached.

For example, the guide 7 shown in FIG. 8 has a first guide 71, a second guide 72, and a connecting rod 73 integrally formed, and corresponds to the first guide 71 by appropriately bending a plate-like body. A first guide portion 71a, a second guide portion 72a corresponding to the second guide 72, and a connecting portion 73a corresponding to the connecting rod 73 are configured. In this way, the guide 7 can be produced at low cost.
In the guide shown in FIG. 8, the open end of the first guide 71a and the open end of the second guide 72a are connected by a connecting plate 74. By doing so, the rigidity of the guide 7 can be increased.

Further, for example, the guide 7 shown in FIG. 9 is integrally provided on at least one side surface of the tension pulley 62 on the upstream side. In this case, since the guide 7 is provided integrally on at least one side surface of the tension pulley 62 on the upstream side, the guide 7 can be provided at low cost.
For example, the guide 7 shown in FIG. 9 includes flanges 81 and 82 provided on at least one side surface of the tension pulley 62 on the upstream side. In this way, the guide 7 can be provided relatively easily.

  According to the belt-type power transmission device 1 according to the present invention, the belt 5 is provided between the crank pulley 22 and the tension pulley 61 on the upstream side, which is a tension side when the engine 2 is started, in at least one lateral region of the belt 5. The guide 7 opposing the side surface of the belt 2 can suppress the belt runaway between the crank pulley 22 and the tension pulley 62 on the upstream side, where the fluctuation of the tension becomes large particularly when the engine 2 is started. Thus, the belt 5 is prevented from running out of tension when the engine 2 starts, and the belt 5 is effectively prevented from shifting in the crankshaft direction between the crank pulley 22 and the tension pulley 61 on the upstream side. be able to.

The present invention is not limited to the above-described embodiment, and includes a form in which the above-described embodiment is modified and a form in which these forms are appropriately combined.
For example, a groove may be provided in the crank pulley 22, the rotary pulley 32, and the air conditioner pulley 42, and the belt 5 may be formed with ribs. By doing so, the belt 5 can be hardly displaced between the rotary pulley 32 and the air conditioner pulley 42 and between the air conditioner pulley 42 and the crank pulley 22.
In the above-described embodiment, the guide 7 is provided between the crank pulley 22 and the tension pulley 61 on the upstream side of the rotary pulley 32. However, the belt 5 is shifted between the rotary pulley 32 and the air conditioner pulley 42. In this case, a guide may be provided between the tension pulley 62 downstream of the rotary pulley 32 and the air conditioner pulley 42.

DESCRIPTION OF SYMBOLS 1 Belt type power transmission device 2 Engine 21 Crankshaft 22 Crank pulley 3 Starter generator 31 Rotary shaft 32 Rotary pulley 4 Compressor 41 Drive shaft 42 Air conditioner pulley 5 Belt 6 Pendulum belt tensioner 61 Upstream tension pulley 62 Downstream tension pulley 63 Fixed shaft 7 Guide 71 First guide 72 Second guide

Claims (7)

A crank pulley provided on an engine crankshaft;
A rotating pulley provided on a rotating shaft of the starter generator,
A belt wrapped around the crank pulley and the rotary pulley, and circulating in one direction between the crank pulley and the rotary pulley;
A pendulum-type belt tensioner that can swing about the same rotation axis as the rotary pulley, and has a tension pulley that is rotatable on each of an upstream side and a downstream side of the rotary pulley;
With
A belt provided between the crank pulley and the upstream tension pulley, which is a tension side when the engine is started, a guide facing a side surface of the belt in at least one lateral region of the belt; Type power transmission device.   2. The belt-type power transmission device according to claim 1, wherein the guide includes a first guide provided on an opposite side of the engine block constituting the engine with the belt interposed therebetween. 3.   The belt-type power transmission device according to claim 2, wherein the first guide extends from an open end of a fixed shaft that rotatably supports the upstream tension pulley.   The belt-type power transmission device according to claim 3, wherein the guide includes a second guide extending from a fixed end of the fixed shaft along the engine block.   The belt-type power transmission device according to claim 1, wherein the guide is integrally provided on at least one side surface of the tension pulley on the upstream side.   The power supply according to claim 1, wherein the starter generator supplies power for starting the engine from the rotation shaft to the crankshaft, while generating power by power transmitted from the crankshaft to the rotation shaft. 7. A belt-type power transmission device according to any one of the preceding claims.   The belt type power transmission device according to any one of claims 1 to 6, further comprising an air conditioner pulley provided on a drive shaft of a compressor, between the tension pulley on the downstream side and the crank pulley. .

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