JPH0315565B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a freewheel device for a vehicle, and more particularly to a freewheel device for a vehicle that stores energy in the freewheel before stopping the engine and uses this energy to restart the engine.

Generally, when a car drives in a city, it stops frequently, but if the engine stops when the car stops, fuel efficiency will improve accordingly.
However, if the starter motor is used to restart the engine each time, the burden of battery, etc. increases.

For this reason, in the past, a freewheel for starting was attached to the output shaft of the engine, and the engine, which was stopped when stopped, was started using the power (inertia force) stored in this freewheel. No. 49-51428) has been published, and is configured as shown in FIG.

According to this device, when the engine is running and the engine is running, the rotation of the output shaft 4 of the engine is controlled by moving the lever 14 by the slave cylinder 12 and the clutch 1.
1, the signal is transmitted to the axle via a transmission (not shown).

At this time, when the actuator 5 is operated by the ON signal _S1 from the control circuit 16 and the lever 7 is moved to bring the freewheel 1 into contact with the lining 3 and rotate it, power is stored in the freewheel 1.

Now, when you stop at an intersection, etc., the engine automatically shuts off. At the same time, when the clutch 11 is turned off and the on signal _S1 is switched to the off signal _S2 , the actuator 5 becomes inactive, the lever 7 is returned by the spring 6, and the freewheel 1 leaves the lining 3 while still rotating.

At the time of starting, the actuator 5 is actuated again by the ON signal _S1 to bring the freewheel 1 into contact with the lining 3, the output shaft 4 is rotated and the engine is started. And clutch 11
The car starts driving by connecting the .

In addition, 2 in the figure is the engine side flywheel, 9
10 is a thrust bearing, 10 is a vacuum tank, 13 is a spring, 15a and 15b are electromagnetic pickups as means for detecting the rotational speed of freewheel 1 and flywheel 2, respectively; 17
is the vehicle speed sensor.

However, in such conventional freewheel devices, a mechanical clutch and an actuator were used to connect the freewheel and the flywheel, which made the structure of the device as a whole complicated, and the length in the axial direction becomes larger, and the impact on vehicles (especially transverse engine FF vehicles)
The problem is that it is difficult to install, requires a large number of parts, and the device itself is expensive. Furthermore, if the engine is stopped when the freewheel rotational speed is low (for example, less than 800 rpm) when stopping, the engine cannot be started by inertia when starting. Therefore, at this time, the engine continues to operate, which poses a problem in that the effect of improving fuel efficiency is reduced.

This invention was made by focusing on such conventional problems, and the connection between the flywheel and the freewheel is made by a movable member attached to the flywheel and a solenoid coil that attracts this movable member. It is an object of the present invention to solve the above problems by providing a freewheel device for a vehicle that has a coil energization control means that controls energization of a solenoid coil.

The present invention will be explained below based on the drawings.

FIGS. 2 and 3 are diagrams showing an embodiment of the present invention. First, the configuration will be explained. In Figure 2, 2
Reference numeral 1 indicates a crankshaft (output shaft) of the engine, and a flywheel 22 having a large moment of inertia is fixed to one end (transmission side end) of the crankshaft 21 with bolts 23.
A ring gear 24 that meshes with a pinion gear of a starter motor (not shown) is fixed to the outer periphery of the flywheel 22, and a flywheel is connected between the flywheel 22 and the cylinder block 25 (specifically, its rear plate). wheel 22
A freewheel 26 rotatably supported by the flywheel 22 is arranged to face the flywheel 22. As the bearing 27 that rotatably supports the freewheel 26, a grease-filled ball bearing is used to reduce the friction loss of the freewheel 26. A predetermined gap is provided between the pair of discs arranged facing each other on the same axis, that is, the flywheel 22 and the freewheel 26, and the freewheel 26 and the flywheel 22 are inserted into this gap. An electromagnetic clutch is provided for connection. That is, an annular movable iron piece 29 is attached to the side surface of the flywheel 22 on the freewheel 26 side via an annular spring 28.
is installed, while freewheel 2
An annular facing 30 is also fixed to the movable iron piece 29 so as to face the movable iron piece 29. Further, the support case 31 is attached to the bolt 3 on the cylinder block 25, more specifically on the rear plate of the crankcase.
2, and a solenoid coil 33 is enclosed within this support case 31. This solenoid coil 33 is energized by a coil energization control means to be described later, and when energized, attracts the movable iron piece 29 through a through hole 34 formed in the freewheel 26. That is, since the radial inner end of the movable iron piece 29 is integrally fixed to the radial outer end of the annular spring 28 fixed to the flywheel 22 by the bolt 35, the movable iron piece 29 as a whole does not move into or out of contact with the freewheel 26. possible. Therefore, when the solenoid coil 33 is energized, the movable iron piece 29 is attracted to the facing 30 and the flywheel 2
2 and the freewheel 26, the movable iron piece 29 is connected to the facing 30 by the biasing force of the spring 28 when the current is not applied (when the current is cut off).
The flywheel 22 and freewheel 26 are separated from each other. Note that 37 is an electromagnetic pickup for detecting the rotational speed of the freewheel 26, and this electromagnetic pickup 37 is disposed opposite to a concavo-convex portion 38 formed on the outer periphery of the freewheel 26.

Next, in FIG. 3, coil energization control means 40
Explain. In the figure, 41 is an engine rotation speed detector that detects the engine rotation speed (the rotation speed of the crankshaft 21, that is, the rotation speed of the flywheel 22). is converted into a voltage by an F-V converter 42 and input to comparators 43 and 44. Furthermore, a freewheel rotation speed detector 4 constituted by the electromagnetic pickup 37
Reference numeral 5 detects the number of revolutions of the freewheel 26, and this detection signal is converted into a voltage by an F-V converter 46 and then input to comparators 44 and 47.

A reference signal is inputted to the comparator 43 from the reference circuit 48, and the comparator 43 compares this reference signal with the engine speed signal mentioned above to determine whether the engine is running or stopped, and turns on when the engine is stopped. The signal is output to an AND circuit 49. As mentioned above, the comparator 44 to which the engine rotation speed signal and the freewheel rotation speed detection signal are input compares these signals and determines whether the engine rotation speed is the freewheel rotation speed detection signal or not.
When the rotation speed is below 6, the ON signal is output to AND circuit 5.
Output to 0. The comparator 47 also includes a reference circuit 5.
A reference signal is input from comparator 4.
7 compares this reference signal with the above-mentioned freewheel rotational speed signal and outputs an ON signal to the AND circuit 50 when the rotational speed of the freewheel 26 is equal to or higher than a predetermined rotational speed (for example, 800 rpm).

Reference numeral 52 denotes a vehicle driving state detector that includes, for example, a vehicle speed sensor and detects the driving state of the vehicle, and this vehicle driving state detector 52 outputs an ON signal to the AND circuit 50 when the vehicle is decelerating and the engine is idling. Also, during idling, an ON signal is also output to the AND circuit 53. A water temperature detector 54 detects the water temperature of the engine, and this water temperature detector 54 outputs an ON signal to the AND circuit 50 when warm-up of the engine is completed. Also,
55 is a start preparation operation detector that detects a start preparation operation, and this detector 55 is turned on when the start preparation operation is performed, for example, when the clutch pedal is depressed, or when the accelerator pedal is depressed together with the clutch pedal. The signal is output to the AND circuit 49.

The AND circuit 50 sends an ON signal to the coil energization cutoff circuit 56 and the AND circuit 53 when all of the ON signals from the comparators 44 and 47 and the vehicle operating state detector 52 and the water temperature detector 54 are input. Output. This coil current cutoff circuit 5
6 cuts off the energization to the solenoid coil 33 when the ON signal is input from the AND circuit 50, and continues to cut off the energization until the reset signal is input.

When ON signals are input from both the AND circuit 50 and the vehicle driving state detector 52, the AND circuit 53 passes through the delay circuit 57 to the engine stop circuit 53.
This engine stop circuit 5 outputs an on signal to
8 stops the engine by, for example, cutting off the fuel when this ON signal is input.

The AND circuit 49 is the start preparation operation detector 55
When ON signals are input from both the comparator 43 and the comparator 43, a reset signal is output to the engine stop circuit 58 and the coil energization cutoff circuit 56,
The operation of the engine stop circuit 58 is canceled (the fuel cutoff is canceled), and the coil energization cutoff circuit 5
6 (returns energization to the solenoid coil 33).

The following effects will be explained.

Now, a case will be described in which the engine is restarted using this vehicle freewheel device.

First, the engine is started from a cold state by turning on the ignition switch and causing the starter motor to rotate the flywheel 22, as in the conventional case. At this time, when the ignition switch is turned on, a current flows through the solenoid coil 33, and the support case 31 and part of the freewheel 26 form a magnetic circuit (are magnetized), causing the movable iron piece 29 to move to the left in FIG. Suction. As a result, the movable iron piece 2
9 comes into contact with the facing 30, and the flywheel 22 and freewheel 26 are connected. Note that at this time, the AND circuit 50 connects the water temperature detector 54
Since no ON signal is input from the coil energization cutoff circuit 56, the coil energization cutoff circuit 56 does not cut off the energization to the solenoid coil 33. At the same time, an ignition system circuit (not shown) is also energized by turning on the ignition switch. Turn this ignition switch further to turn on the starter switch.
As a result, the starter motor is energized, its pinion gear meshes with the ring gear 24, and the flywheel 22 and the crankshaft 21 are started to rotate by the starter motor. Furthermore, since the freewheel 26 is connected to the flywheel 22 by the electromagnetic clutch as described above,
This flywheel 22, crankshaft 21
It rotates as one.

Next, when the warm-up of the engine is completed (when the water temperature reaches a predetermined temperature), the water temperature detector 54 continues to output the ON signal. Here, after warming up, for example 40
When the vehicle is traveling at Km/h, the vehicle driving status detector 5
Since the ON signal from 2 is not input to the AND circuit 50, the coil energization cutoff circuit 56 does not cut off the energization to the solenoid coil 33, and the freewheel 26 is connected to the flywheel 22 and rotates together.

Here, when the vehicle shifts from this running state to a deceleration state, the vehicle driving state detector 52 inputs an ON signal to the AND circuit 50. As a result, the AND circuit 50 outputs an ON signal to the coil energization cutoff circuit 56, and the coil energization cutoff circuit 56 cuts off the energization to the solenoid coil 33. Therefore, the freewheel 26 is separated from the flywheel 22 by the electromagnetic clutch and continues to rotate freely due to inertial energy.

Next, when the vehicle stops from the deceleration state, the vehicle driving state detector 52 outputs an ON signal to the AND circuit 53. As a result, the AND circuit 53
activates the engine stop circuit 58 via the delay circuit 57, and the engine is stopped after a predetermined period of time has elapsed.
During this period when the engine is stopped, the freewheel 26 is gradually attenuated due to the loss of the bearing 27, windage damage, etc., and the rotational energy decreases. However, in this invention, by using the low friction bearing 27, the inertia of the freewheel Due to the proper selection of the moment, the freewheel 26 can retain the rotational energy required for starting for several minutes. Therefore, there is no problem in restarting using the freewheel 26 during a short period of time, such as when stopping temporarily or waiting at a traffic light. Also, at this time, the comparator 4 is
3 outputs an on signal to the AND circuit 49.

After this, when you perform a start preparation operation such as depressing the clutch pedal, depressing the accelerator pedal, switching the gear position of the transmission from the neutral position to the running position, or releasing the handbrake, the start preparation operation detector 55 is activated. The ON signal is output to the AND circuit 49. As a result, AND circuit 49 outputs a reset signal to engine stop circuit 58 and coil energization cutoff circuit 56, thereby canceling the operation of these circuits 58 and 56. That is, the energization to the solenoid coil 33 is restarted, and the fuel cutoff, ignition cutoff, etc. for stopping the engine are canceled. By energizing the solenoid coil 33, the electromagnetic clutch connects the freewheel 26 and the flywheel 22 in the same manner as described above. As a result, the rotational energy of the freewheel 26 is transmitted to the flywheel 22, and the rotation of the flywheel 22 restarts the crankshaft 21. Incidentally, restarting the engine after waiting for a signal for a long time is carried out by driving the starter motor by means not shown, or by manually operating the ignition switch. As described above, in the vehicle freewheel device according to the present invention, since the driving torque for restarting the engine is relatively small, it is sufficient to use a small electromagnetic clutch. Furthermore, since the electromagnetic coil is fixed to the cylinder block side, the driving torque is reduced and the durability of the electromagnetic coil is also improved.

As explained above, according to this invention,
A flywheel that is rotationally driven together with the output shaft of the engine, a freewheel that is arranged to face the flywheel and rotatably supported by the output shaft, and a freewheel that is attached to the flywheel and is spaced apart from the freewheel. The structure is simple because it includes a movable member that can be contacted, a solenoid coil that attracts the movable member when energized to connect the flywheel and the freewheel, and a means for controlling energization of the solenoid coil. It was possible to achieve miniaturization and thus obtain an inexpensive and highly reliable freewheel device for a vehicle. Additionally, the length of the engine crankshaft in the axial direction has been shortened, making it easier to mount on FF vehicles with horizontal engines. Additionally, since the engine is stopped each time the vehicle is decelerating or idling, fuel efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic overall view showing a conventional freewheel device, FIG. 2 is a schematic cross-sectional view showing an embodiment of a freewheel device for a vehicle according to the present invention, and FIG. 3 is a diagram of the electromagnetic clutch shown in FIG. FIG. 3 is a circuit diagram showing energization control means. 21...Output shaft, 22...Flywheel, 26...
Freewheel, 29...Movable member, 33...Solenoid coil, 40...Coil energization control means.

Claims (1)

[Claims] 1. A flywheel that is rotationally driven together with the output shaft of the engine, a freewheel that is arranged to face the flywheel and is rotatably supported by the output shaft, and a freewheel that is attached to the flywheel via a spring. A movable member provided so as to be able to move toward and away from the freewheel, a solenoid coil that attracts the movable member when energized to connect the flywheel and the freewheel, and a coil energization control means that energizes the solenoid coil. A freewheel device for a vehicle equipped with.