JP3755643B2 - Belt drive - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a belt transmission device that uses a belt to transmit a rotational force when an internal combustion engine is started and when an auxiliary machine is driven by the internal combustion engine.
[0002]
[Prior art]
JP-A-8-14145 discloses a crank pulley attached to a crankshaft of an internal combustion engine, a pulley attached to each auxiliary device arranged around the internal combustion engine, and a pulley attached to a starting motor. The belt transmission device is shown in which the internal combustion engine is started via the belt by the starter motor, and each auxiliary machine is driven by the internal combustion engine via the belt after the internal combustion engine is started.
[0003]
[Problems to be solved by the invention]
When starting the internal combustion engine via the belt by the starter motor, a large rotational force must be transmitted by the pulley of the starter motor, so belt slip is likely to occur. To avoid this, high tension is applied to the belt. There is a need. For this reason, since the belt tension that is larger than necessary is continuously applied even after the internal combustion engine is started, there is a problem that the life of the belt is remarkably reduced.
In addition, the large belt tension is applied to pulleys attached to other auxiliary machines, which increases the strength of auxiliary machine shafts and bearings and their support structure, and increases the size and cost of auxiliary machines. there were.
In addition, when the belt width is increased to reduce the occurrence of belt slip in accordance with the large transmission torque at the start, the crank pulley, the pulley of each auxiliary machine, the pulley of the fixed tensioner, the auto tensioner are accordingly accompanied. The width of the pulley is also increased, and there are problems such as an increase in installation space of the belt transmission device or difficulty in installation.
[0004]
An object of the present invention is to solve the above-described problems, and the occurrence of belt slip can be reduced, the life of the belt can be extended, and the size and cost can be reduced. A belt transmission device is provided.
[0005]
[Means for Solving the Problems]
Belt transmission device according to the invention, first transmits a first rotating electric machine and the second rotating electric machine supplies starting power, these to the rotating electrical machine are connected the starting power to the internal combustion engine to the internal combustion engine 1 pulley for a rotating electrical machine, 2 pulley for a rotating electrical machine, a pulley for an internal combustion engine that transmits the starting power to the internal combustion engine and the rotational power of the internal combustion engine to an auxiliary machine, and the pulley for the internal combustion engine and auxiliary pulley rotated by driving the auxiliary machine by the power from the auto-tensioner for pressing the auto tensioner pulley, prior SL engine pulley, the first rotating electric machine pulley, rotating the second electric machine pulley, the belt from the engine pulley in a belt transmission device that includes a the auto tensioner pulley and said are wound continuously in the auxiliary pulley belt Toward the moving direction, the first rotary electric machine pulley, the second rotating electric machine pulley, said auto-tensioner pulley, and the belt, respectively in this order is disposed in the Supplement pulley is intended to be driven .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
1 is a plan view of a vehicle belt transmission device according to Embodiment 1 of the present invention, FIG. 2 is a diagram showing belt tension values in each pulley of FIG. 1, and FIG. 3 is a diagram showing two starter motors of FIG. It is a figure which shows the rotation speed and torque characteristic of this, and its synthetic torque characteristic.
The belt transmission is attached to a crank pulley 2 that is a pulley for an internal combustion engine attached to a crankshaft of the internal combustion engine 1, a first auxiliary machine (not shown), and a second auxiliary machine (not shown). an auxiliary pulley 3 and 4 are a fixed tensioner pulleys 5,6, the auto-tensioner pulley 7, the first starting motor pulley 8 is a first rotating electric machine pulley, a second rotating electric machine A second starter motor pulley 9 that is a pulley, and a fixed tensioner pulley 5, auxiliary pulleys 3 and 4, an auto tensioner pulley 7, a second starter motor pulley, counterclockwise from the crank pulley 2 in FIG. 9, a fixed tensioner pulley 6 and a first belt 10 wound around a first starter motor pulley 8 in this order.
[0007]
The fixed tensioner pulleys 5 and 6 increase the belt winding angle of the belt 10 applied to the crank pulley 2, the auxiliary pulley 3, the first starter motor pulley 8, and the second starter motor pulley 9, thereby preventing the belt slip. It does not occur.
Auto tensioner Na (not shown) are similarly auto-tensioner pulley 7 accessory pulley 4 with a certain set the tension of the belt 10 in advance as well as increasing the belt wrap angle of the second starter motor pulley 9 Has the function of maintaining tension.
The directions of arrows A shown on the outer periphery of the crank pulley 2, the first starter motor pulley 8, and the second starter motor pulley 9 indicate the rotation directions of the pulleys 2, 8, and 9, respectively.
[0008]
Next, the operation of the belt transmission device for a vehicle having the above configuration will be described.
In FIG. 1, when the internal combustion engine 1 is started from a state where the internal combustion engine 1 is stopped, the first starter motor 108 that is the first rotary electric machine and the second starter motor 109 that is the second rotary electric machine The first starter motor pulley 8 and the second starter motor pulley 9 are rotated in the direction of arrow A. This rotational power is transmitted to the crank pulley 2 via the belt 10, and the crank pulley 2 rotates to start the internal combustion engine 1.
After the internal combustion engine 1 is started, the rotational power of the internal combustion engine 1 rotates the auxiliary pulleys 3 and 4 via the crank pulley 2 and the belt 10 to drive the first auxiliary machine and the second auxiliary machine.
[0009]
Note that an external signal, such as an internal combustion engine speed signal, an internal combustion engine start signal, a vehicle speed signal, etc., is transmitted to the CPU 100, and the CPU 100 performs signal processing and arithmetic processing. The processed control signal is supplied to the first starter motor 108 in which the first starter motor pulley 8 is fixed to the output shaft via the first inverter 101 and the second inverter 102, and to the output shaft. The first starter motor 108 and the second starter motor 109 are controlled by being transmitted to the second starter motor 109 to which the starter motor pulley 9 is fixed.
[0010]
In FIG. 2, Ta is a tension difference between the belt tension side and the slack side of the first starter motor pulley 8, and Tb is a tension difference between the belt tension side and the slack side of the second starter motor pulley 9.
Tc is a belt tension side (crank pulley) required for starting the first auxiliary machine, the second auxiliary machine and the internal combustion engine 1 with the first starting motor pulley 8 and the second starting motor pulley 9. 2 and the belt 10 between the first starter motor pulley 8 and the belt loose side (region C of the belt 10 between the auxiliary pulley 4 and the second starter pulley 9). Tension difference.
[0011]
In order to start and drive the first auxiliary machine, the second auxiliary machine, and the internal combustion engine 1, a belt tension difference Tc is required. As can be seen from this figure, in this embodiment, the first starter motor 108 and the second starter motor 109 share the tension difference Tc, so that the first starter motor is used. The tension differences Ta and Tb between the belt tension side and the belt loosening side of the pulley 8 and the second starter motor pulley 9 can be small.
Therefore, the first starter motor pulley 8, the second starter motor pulley 9 becomes the belt slip is difficult to occur, the need to unnecessarily large width of the belt 10 is not, therefore the belt 10 to the auto tensioner Na There is no need to increase the tension.
[0012]
For this reason, it is possible to prevent a decrease in the life of the belt 10 due to an excessively high belt tension, and it is also possible to prevent an increase in the size and cost of the accessory due to an increase in strength of the shaft and bearing of the accessory and its support structure .
[0013]
Further, as shown in FIG. 3, the rotational speed / torque characteristic of the first starting motor 108 is a low-speed torque-oriented type, and the rotational speed / torque characteristic of the second starting motor 109 is a high-speed torque-oriented type. As can be seen from the combined torque indicated by the dotted line obtained by combining these torque characteristics, the starting power of the internal combustion engine 1 and the auxiliary machine can obtain a high torque even in the low speed range, and the required torque in the high speed range. This starting power is transmitted to the internal combustion engine 1 and the first and second auxiliary machines via the belt 10.
[0014]
In the first embodiment, two standard starter motors 108 and 109 and two small capacity inverters 101 and 102 are used.
By doing like this embodiment, it is cheap compared with what uses one large starting motor and one large capacity inverter, respectively.
[0015]
Embodiment 2. FIG.
4 is a plan view of a vehicle belt transmission apparatus according to Embodiment 2 of the present invention. The same or corresponding parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted.
In the second embodiment, the belt tension adjusting means 200 that can press the belt 10 and set the belt tension in two stages is arranged in the belt most loose region C. The tension adjusting unit 200 includes an auto tensioner pulley 201 that is wound around the belt 10 and is rotated by the movement of the belt 10, and an auto tensioner 202 that presses the auto tensioner pulley 201 and presses the belt 10 via the auto tensioner pulley 201. It consists of and. The tension adjusting means 200 is configured so that the tension of the belt 10 when starting the internal combustion engine 1 and the auxiliary machine with the first starter motor 108 and the second starter motor 109 is compensated by the internal combustion engine 1 after starting the internal combustion engine 1. It is set to be larger than when the machine is driven.
[0016]
The auto tensioner 202 includes a spring (not shown) that is elastically deformed, a push rod 203 that presses the auto tensioner pulley 201 with a reaction force at that time, and elastic deformation means that elastically deforms the spring.
The elastic deformation means includes an electromagnetic coil (not shown) and a movable electromagnetic core (not shown) that is attracted by an electromagnetic attractive force generated when the electromagnetic coil is energized and presses the spring.
The tension control for setting the tension of the belt 10 is controlled by transmitting an external signal, such as an internal combustion engine speed signal, an internal combustion engine start signal, a vehicle speed signal, etc. to the CPU 100. It is transmitted to the control circuit 210 and is performed based on the control signal from the electromagnetic coil control circuit 210.
[0017]
In the vehicular belt transmission apparatus having the above-described configuration, the push rod 203 of the auto tensioner 202 presses the flange 204 of the auto tensioner pulley 201 with the set pressing force only when high torque transmission at the start of the internal combustion engine is necessary, and the auto tensioner The pulley 201 is rotated clockwise around the fulcrum 205 to press the belt 10 and adjust the belt 10 to a predetermined tension.
After the internal combustion engine 1 is started, the push rod 203 is retracted and the auto tensioner pulley 201 is rotated counterclockwise around the fulcrum 205 to return to the normal appropriate tension of the belt 10 for driving the auxiliary machine. .
[0018]
Therefore, the tension of the belt 10 is increased only when high torque transmission at the start of the internal combustion engine 1 is necessary, and after the internal combustion engine 1 is started, the tension is returned to the normal appropriate belt 10 for driving the auxiliary machine. The life of the belt 10 can be extended, and the adverse effect on the auxiliary machine due to the belt tension can be minimized.
[0019]
In the second embodiment, electromagnetic force is used as the elastic deformation means for elastically deforming the spring. However, the present invention is not limited to this. For example, pressure oil may be used for elastic deformation, the expansion force of wax generated by heat generation, or the power of an electric motor may be used.
[0020]
In the above embodiment, the starter motor is used as the rotating electrical machine, but a motor generator may be used.
[0021]
【The invention's effect】
As described above, according to the engagement Ru belt transmission device according to the present invention, the first rotary electric machine and the second rotating electric machine supplies starting power to an internal combustion engine, are connected to these rotary electrical machine the internal combustion engine A first rotating electrical machine pulley and a second rotating electrical machine pulley that transmit the starting power to the internal combustion engine, and an internal combustion engine that transmits the starting power to the internal combustion engine and transmits the rotational power of the internal combustion engine to an auxiliary machine. and use the pulley, the auxiliary machine pulley that drives the auxiliary machine rotating by the power from the internal combustion engine pulley, and an auto tensioner for pressing the auto tensioner pulley, prior SL engine pulley, rotating the first electric machine pulley, the second rotating electric machine pulley, said auto-tensioner pulley and e Bei a belt that is wound continuously in pulley the auxiliary, the base from the internal combustion engine pulley The first rotating electrical machine pulley, the second rotating electrical machine pulley, the auto tensioner pulley, and the supplementary pulley are arranged in this order along the moving direction of the belt so that the belt is driven. Therefore, the first rotating electrical machine and the second rotating electrical machine share a large starting power necessary for starting the internal combustion engine, and accordingly, the first rotating electrical machine pulley and the second rotating electrical machine pulley The difference in tension between the tension side belt and the slack side belt is reduced, and the occurrence of belt slip can be reduced without increasing the belt width.
Further, since the occurrence of belt slip can be reduced without increasing the belt tension applied to the first and second rotating electrical machine pulleys, the life of the belt is extended, and the shafts and bearings of the auxiliary machines and the support structure thereof are improved. Miniaturization and cost reduction can be achieved.
[0022]
Further, according to the belt transmission device according to this inventions, the first rotary electric machine and the second rotary electric machine, since each rotational speed-torque characteristics are different, by combining the characteristics that complement each other, one Desired belt transmission characteristics that cannot be obtained with a rotating electrical machine can be obtained.
[0023]
Further, according to the belt transmission device according to this inventions, the internal combustion engine is an internal combustion engine for a vehicle, extend the life of the vehicle belt, also axial and bearing of the vehicle accessory, the miniaturization of the support structure and Cost reduction can be achieved.
[0024]
Further, according to the belt transmission device according to this inventions, the first rotary electric machine and the second rotating electric machine are the starter motor, the starting power to the engine stability can be reliably supplied.
[0025]
Further, according to the belt transmission device according to this inventions, the first rotary electric machine and the second rotating electric machine are the motor generator, the starting power to the engine stability can be reliably supplied At the same time, after the internal combustion engine is started, electricity can be supplied to the auxiliary machine, for example, by the motor generator.
[Brief description of the drawings]
FIG. 1 is a plan view of a belt transmission device according to a first embodiment of the present invention.
FIG. 2 is a diagram illustrating a belt tension value in each pulley of FIG. 1;
FIG. 3 is a diagram showing rotation speed / torque characteristics and combined torque characteristics of the two starter motors of FIG. 1;
FIG. 4 is a plan view of a belt transmission device according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Internal combustion engine, 2 Crank pulley (Internal combustion engine pulley), 3, 4 Auxiliary machine pulley, 8 First starter motor pulley (Rotary electric machine pulley), 9 Second starter motor pulley, 10 Belt, 108 1st starter motor, 109 2nd starter motor, 200 belt tension adjusting means, 201 auto tensioner pulley , 202 auto tensioner, 203 push rod.

Claims (5)

A first rotating electric machine and a second rotating electric machine for supplying starting power to the internal combustion engine;
A first rotating electrical machine pulley and a second rotating electrical machine pulley connected to each of the rotating electrical machines and transmitting the starting power to the internal combustion engine;
A pulley for an internal combustion engine that transmits the starting power to the internal combustion engine and transmits the rotational power of the internal combustion engine to an auxiliary machine;
An accessory pulley that rotates with the power from the pulley for the internal combustion engine to drive the accessory;
An auto tensioner that presses the auto tensioner pulley ;
Before SL engine pulley, the first rotating electric machine pulley, the second rotating electric machine pulley, said auto-tensioner pulley and belt transmission having a belt that is wound continuously in pulley the auxiliary in the apparatus
The first rotating electrical machine pulley, the second rotating electrical machine pulley, the auto tensioner pulley, and the supplementary pulley are arranged in this order from the internal combustion engine pulley toward the belt moving direction. A belt transmission device, wherein the belt is driven . The belt transmission device according to claim 1, wherein the first rotating electrical machine and the second rotating electrical machine have different rotational speed and torque characteristics. The belt transmission device according to claim 1 , wherein the internal combustion engine is a vehicle internal combustion engine. The belt transmission device according to any one of claims 1 to 3, wherein the first rotating electrical machine and the second rotating electrical machine are starter motors. The belt transmission device according to any one of claims 1 to 3, wherein the first rotating electric machine and the second rotating electric machine are motor generators.

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