JPH0742799A - Auxiliary driving device - Google Patents

Abstract

PURPOSE:To make such an ideal function as saying that proper rotational power is transmitted to an auxiliary irrespective of rotational frequency in an engine output shaft, realizable in a simple structure. CONSTITUTION:This auxiliary driving device is composed of a differential mechanism 1 consisting of a few gears and a control means 2 controlling the differential conditions, and in this constitution, a driving shaft of this differential mechanism 1 is set down to an engine crankshaft 3, and one side driven shaft out of two driven shafts to an input shaft 5 of an auxiliary 4 and the other remaining driven shaft to a braking shaft 21a of a braking unit 21 of the control means 2, respectively. With this formation, if turning torque at the side of the braking shaft 21a is made smaller than that at the side of the input shaft 5, turning power of the crankshaft 3 is decelerated and transmitted to the input shaft 5 of the auxiliary 4, and also if the torque at the side of the braking shaft 21a is made larger than that at the side of the input shaft 5, the turning power of the crankshaft 3 is seed up and thereby it comes to be transmitted to the input shaft 5 of the auxiliary 4 in consequence.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary machine drive device for driving an auxiliary machine such as an alternator, a power steering pump, a cooler compressor, etc. by utilizing the power of an engine mounted on an automobile, and more particularly, The present invention relates to an improved gear shifting portion.

[0002]

2. Description of the Related Art In automobiles, engine power is used to drive auxiliary machinery such as alternators, power steering pumps and cooler compressors. Until now, the engine crankshaft and auxiliary machinery input shafts have been used. And are directly connected via a pulley and a belt or a drive shaft.

By the way, the engine of an automobile rotates in a wide speed range from low speed to high speed, and in particular, when the engine rotates at high speed, the auxiliary machine can be rotated at a higher speed than necessary. In addition to being easily damaged,
The load on the engine becomes heavy and the horsepower and fuel are lost. Note that the driving force may be insufficient during low-speed rotation such as idling rotation of the engine, depending on the auxiliary machinery.

On the other hand, various auxiliary machine drive devices have been proposed for transmitting almost proper rotational power to the auxiliary machine regardless of the engine speed. Note that, as the transmission means of this accessory drive device, for example, a continuously variable transmission called CVT using two pulleys and a V belt, a continuously variable transmission using a planetary cone, etc. are used.

[0005]

By the way, the above-mentioned continuously variable transmission has a complicated structure and complicated assembling.
It is pointed out that maintenance at the time of failure is troublesome.

In view of the above circumstances, it is an object of the present invention to realize an ideal function of transmitting an appropriate rotational power to an auxiliary machine with a simple structure regardless of the rotational speed of an engine output shaft. There is.

[0007]

DISCLOSURE OF THE INVENTION The present invention is an auxiliary machine drive device configured to continuously increase and decrease the rotational speed of an output shaft of an engine and transmit the rotational speed to an input shaft of an auxiliary machine. A differential mechanism that uses a drive shaft as one of two driven shafts (a first driven shaft) and an auxiliary machine input shaft, and the remaining driven shafts (second driven shafts) of this differential mechanism.
And a control means for controlling the rotation torque of the stepless motor.

[0008]

When the rotational torque of the second driven shaft side of the differential mechanism is made smaller than the rotational torque of the first driven shaft side by the control means, the rotational power of the drive shaft is decelerated and transmitted to the first driven shaft, and conversely. When it is increased, the rotational power of the drive shaft is accelerated and transmitted to the first driven shaft. Further, if the rotational torques on the first driven shaft side and the second driven shaft side are the same, the rotational power of the drive shaft is transmitted to the first driven shaft without being shifted.

By appropriately setting such control according to the rotational speed of the engine output shaft, the auxiliary machine can be driven under stable conditions regardless of the rotational power of the engine. Moreover, since the differential mechanism having a structure in which a small number of gears are combined is used as the speed changing means, the structure is simple.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the embodiments shown in FIGS. FIG. 1 is a vertical cross-sectional side view of an embodiment of an auxiliary machine drive device of the present invention. The auxiliary machine drive device shown in FIG. 1 includes a differential mechanism 1 and a control means 2 for controlling a differential condition of the differential mechanism 1. Is equipped with.

The differential mechanism 1 includes a drive gear 11 and a ring gear 12 that meshes with the drive gear 11 and rotates about an axis parallel to the axis of rotation.
A pair of first and second side gears 14, 15 rotatably attached to a shaft 13 provided on one side of the ring gear 12 so as to be orthogonal to the rotation axis thereof, and the pair of side gears 14, 15. Two pairs of third and fourth meshing with 15
The side gears 16 and 17 are provided. Drive gear 1
1 is a crankshaft 3 of an automobile engine, 3rd side gear 16 is an input shaft 5 of an auxiliary machine 4 parallel to the crankshaft 3, and 4th side gear 17 is a coaxial control of the input shaft 5 of the auxiliary machine 4. In the braking shaft 21a of the braking unit 21 of the means 2,
Each is connected. At a predetermined position of the braking shaft 21a, the ring gear 12 is rotatably supported via a rolling bearing (not shown). In short, the crankshaft 3 corresponds to the drive shaft of the claims, the input shaft 5 corresponds to the first driven shaft of the claims, and the braking shaft 21a corresponds to the second driven shaft of the claims.

The control means 2 includes a braking unit 21 such as an electromagnetic brake which gives a rotational resistance to the fourth side gear 17 steplessly, and a measuring device 22 which measures the rotation speed of the input shaft 5 of the auxiliary machine 4. The operation of the braking unit 21 is controlled so that the rotational speed of the input shaft 5 of the auxiliary machine 4 is appropriately set based on the outputs from the measuring device 22 and the rotational speed measuring device (not shown) of the engine crankshaft 3. And a controller 23. The measuring instrument 22 is the detected ring 22.
a and a rotation sensor 22b. Controller 23
Is compared with a preset reference value of the engine crankshaft 3 rotation speed detected by a measuring device (not shown), and if the rotation speed of the input shaft 5 of the auxiliary equipment 4 exceeds the reference value, The braking unit 21 is controlled on the basis of the measurement result of the measuring instrument 22 so as to hold the same.

Next, the operation will be described. First, the ring gear 12 of the differential mechanism 1 is rotated by the rotation of the crankshaft 3, and the first and second side gears 14, 15 are rotated.
Is revolved, and the input shaft 5 of the auxiliary machine 4 and the braking shaft 21 of the braking unit 21 are passed through the third and fourth side gears 16 and 17.
a and are rotated. At this time, when the rotational torques of the input shaft 5 side of the accessory 4 and the braking shaft 21a side are the same, the gear ratio between the drive gear 11 and the ring gear 12 is changed from the crankshaft 3 to the input shaft 5 of the accessory 4. Power transmission (eg, constant speed) is performed at a predetermined ratio determined, but when the rotational torques of the input shaft 5 side of the auxiliary machine 4 and the braking shaft 21a side become unbalanced,
The rotation speed of the input shaft 5 of the auxiliary machine 4 increases or decreases with respect to the rotation speed of the crankshaft 3. Specifically, the braking torque of the braking shaft 21a is input to the input shaft 5 by the braking unit 21.
When the rotation torque of the engine crankshaft 3 is reduced, the rotation power of the engine crankshaft 3 is reduced and transmitted to the input shaft 5 of the auxiliary machine 4. When the rotation torque of the braking shaft 21a side is made larger than that of the input shaft 5 side, the engine crankshaft The rotational power of 3 is increased and transmitted to the input shaft 5 of the accessory 4.

Therefore, when the rotation speed of the crankshaft 3 is slower than the proper range of use of the auxiliary machine, the rotational power of the crankshaft 3 is increased and transmitted to the input shaft 5 of the auxiliary machine 4, and the crankshaft 3 is also used. When the rotation speed of is within the proper usage range of the auxiliary machine, the input shaft 5 of the auxiliary machine 4 is not accelerated or decelerated, and when the rotation speed of the crankshaft 3 is faster than the proper usage range of the auxiliary machine, It is preferable to control the rotational power of the crankshaft 3 so that the rotational power is reduced and transmitted to the input shaft 5 of the auxiliary machine 4. By such control, it becomes possible to always transmit appropriate rotational power to the auxiliary machine regardless of the increase / decrease in the rotational speed of the crankshaft 3. In short, for example, as shown in the graph of the relationship between the engine rotation speed and the pulley rotation speed in FIG. 2, in the region from the rotation speed 0 to X, the crankshaft 3 and the input shaft 5 of the auxiliary machine 4 have the same speed. Control so that even if the rotation speed of the crankshaft 3 continues to rise above X, the rotation power of the crankshaft 3 continues to be reduced so that the rotation speed of the input shaft 5 of the auxiliary machine 4 remains constant at X. Control. The value of the constant rotation speed may be appropriately set so as to be appropriate for each auxiliary machine 4.

The present invention is not limited to the above embodiment. That is, the braking unit 21 is required to have a function of providing stepless rotation resistance as a function thereof, and therefore, the braking unit 21 may be a fluid brake, for example.

[0016]

As described above, according to the present invention, an appropriate rotational power can always be transmitted to an auxiliary machine regardless of increase / decrease in the rotational speed of the crankshaft. On the other hand, the unreasonable burden will not be imposed, and it will be possible to improve the life of auxiliary machinery and eliminate horsepower loss and fuel loss of the engine. Moreover, while allowing such an ideal function to be exhibited, since the differential mechanism composed of a small number of gears is used as the speed changing means, initial assemblability and temporal maintenance are easy, and the initial cost is low. The running cost can be reduced, which is economically advantageous.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an accessory drive system according to an embodiment of the present invention.

FIG. 2 is a graph showing the relationship between engine rotation speed and accessory rotation speed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Differential mechanism 2 Control means 3 Crank shaft 4 Auxiliary machine 5 Input shaft of auxiliary machine 21a Braking shaft

Claims (1)

[Claims] 1. An auxiliary machine drive device configured to continuously increase / decrease a rotational speed of an output shaft of an engine and transmit the rotational speed to an input shaft of an auxiliary machine, wherein the engine output shaft is a drive shaft and the auxiliary machine input shaft is a drive shaft. A differential mechanism that is one of the two driven shafts (first driven shaft) and a control unit that continuously controls the rotational torque of the remaining driven shafts (second driven shafts) of the differential mechanism are provided. Auxiliary machine drive device characterized by the following.