JPH07119478A - Driving device of supercharger - Google Patents

Abstract

PURPOSE:To provide the driving device of a supercharger capable of decreasing variation of torque and varying rotational speed of the supercharger. CONSTITUTION:An oil pressure pump 23 connected to the rotary shaft of an engine 20, a hydraulic motor 25 connected to a supercharger 27, and circulation passages 24a, 24b for connecting the oil pressure pump 23 to the hydraulic motor 25, and supplying/recovering fluid of the hydraulic pump 23 to/from the hydraulic motor 25 are provided in the driving device of the supercharger 27 for supercharging the engine 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive unit for a supercharger.

[0002]

2. Description of the Related Art There is a supercharger as a device for improving the driving horsepower of an automobile. This is a device that supercharges the air supplied to the engine by the rotational force of the engine.

FIG. 2 is a partial sectional view of a conventional supercharger. It should be noted that the rotary system is shown by upward-sloping hatching, and the fixed system is shown by downward-sloping hatching.

In the figure, 1a and 1b are housings, and a rotary shaft 4 is provided in the housing 1a via bearings 2 and 3. A pulley 5 is fixed to one end (upper side in the figure) of the rotary shaft 4 with a bolt 6, and a speed increasing wheel 7 is attached to the other end (center in the figure) of the rotary shaft 4. A gear 8 is formed on the outer peripheral portion of the speed increasing wheel 7. The gear 8 is engaged with a gear 11 attached to the end (center in the figure) of the rotary shaft 10 of the F rotor 9 parallel to the rotary shaft 4 with a bolt 10a. The rotating shaft 10 is attached to the partition walls of the housings 1 a and 1 b via bearings 12. This rotary shaft 10 has an F timing gear 13
Is provided. The F timing gear 13 is engaged with an M timing gear 16 attached to the end of the rotary shaft 15 of the M rotor 14 parallel to the rotary shafts 4 and 10 with a bolt 15a. The rotating shaft 15 is attached to the partition walls of the housings 1a and 1b via bearings 17.

The other ends of the rotary shafts 10 and 15 are attached to the housing 1b via bearings (not shown).

Here, the pulley 5 is a belt 1 indicated by a chain double-dashed line.
Is connected to the rotating shaft of the engine (not shown) via 8,
It is designed to get the torque of the engine.

When the engine rotates, the pulley 5 rotates, and the gears 11, 13, 16 are transmitted to the rotary shafts 10, 15 to rotate the rotors 9, 14. Both rotors 9, 14
When is rotated, air is sucked into the supercharger from the suction side port (not shown) and is supplied to the engine from the discharge side port (both ports are not shown).

[0008]

However, when the supercharger is driven by using the conventional belt, the fluctuation of the torque causes the oil pulsation and the rotational speeds of the timing gears 13 and 16 change abruptly. , And collide with each other to generate collision noise (teeth rattling noise), which causes noise. Further, when trying to adjust the amount of air supplied to the supercharger, the rotation speed is determined by the rotation speed of the engine and cannot be changed.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a drive unit for a supercharger in which the fluctuation of torque is small and the rotation speed of the supercharger can be changed.

[0010]

In order to achieve the above object, the present invention relates to a drive unit for a supercharger for supercharging an engine, wherein a hydraulic pump connected to a rotary shaft of the engine and a supercharger are connected. It is provided with a hydraulic motor and a circulation path that connects the hydraulic pump and the hydraulic motor to supply and recover the fluid of the hydraulic pump to and from the hydraulic motor.

[0011]

According to the above structure, the hydraulic pump is rotationally driven by the rotational force of the engine, the hydraulic motor is rotationally driven by the oil supplied and collected from the hydraulic pump, and the supercharger is rotationally driven by this hydraulic motor. Even if the rotational torque of the engine fluctuates, the oil in the circulation path cannot follow the fluctuation, so that a rapid change in the rotational speed of the gear in the supercharger, that is, pulsation disappears and gear rattle noise decreases.

[0012]

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a conceptual diagram of an embodiment of a drive unit for a supercharger according to the present invention.

In the figure, reference numeral 20 is, for example, a diesel engine, and its rotary shaft 21 is connected to a rotary shaft of a hydraulic pump 23 by a joint 22. The oil outlet of the hydraulic pump 23 is connected to the oil inlet of the hydraulic motor 25 by the flow path 24a. This channel 24a has a channel 24
An accumulator 26 that absorbs minute pressure fluctuations in a and 24b is provided. The oil outlet of the hydraulic motor 25 is connected to the oil inlet of the hydraulic pump 23 by the flow path 24b. A circulation path is formed by these flow paths 24a and 24b, and the oil in the circulation paths 24a and 24b is supplied to the hydraulic motor 25 by the hydraulic pump 23 and collected. The rotary shaft of the hydraulic motor 25 is connected to the rotary shaft of the supercharger 27. That is, the drive device for the supercharger 27 of this embodiment is
Using the pulley 5 and the belt 18 shown in FIG.
Instead of rotating, the rotary shaft 4 is directly rotated by the hydraulic motor 25. The air outlet of the supercharger 27 is connected to the air inlet 28 of the engine 20.

The hydraulic motor 25 can change the number of rotations by changing the angle of the blade. That is, the rotation speed of the supercharger can be changed.

Next, the operation of the embodiment will be described.

When the engine operates, the rotary shaft 21 rotates, and the rotational force drives the hydraulic pump 23 to rotate, and oil is supplied from the hydraulic pump 23 to the hydraulic motor 25 to rotate the hydraulic motor 25. Since the rotary shaft of the supercharger 27 is rotated by the hydraulic motor 25, even if the rotational torque of the engine 20 fluctuates, the oil circulating in the circulation paths 24a and 24b cannot follow the fluctuation,
Circulation paths 24a, 24b with almost constant flow rate without pulsation
It will circulate inside. Further, the flow rate of oil is stabilized by the accumulator 26 provided in the flow path 24a, and the timing gear 13 in the supercharger 27,
The sudden change in the rotational speed of 16 is eliminated, and the rattling noise of the timing gears 13 and 16 is reduced.

As described above, according to this embodiment, the hydraulic pump connected to the rotary shaft of the engine, the hydraulic motor connected to the supercharger, the hydraulic pump and the hydraulic motor are connected, and the fluid of the hydraulic pump is transferred to the hydraulic motor. Since a circulation path for supplying and recovering the supercharger is provided, it is possible to realize a supercharger drive device capable of changing the rotation speed of the supercharger with little fluctuation in torque.

The supercharger described in this embodiment has been described as a screw type, but the present invention is not limited to this, and the roots type, vane type,
Either a scroll type or a rotary type may be used. Further, although the case where the engine is a diesel engine has been described, it goes without saying that it may be a gasoline engine.

[0020]

In summary, according to the present invention, the following excellent effects are exhibited.

Since the supercharger is rotationally driven by the hydraulic motor to which oil is supplied by the hydraulic pump driven by the rotation of the engine, it is possible to change the rotational speed of the supercharger with little fluctuation in torque. Can be realized.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of an embodiment of a drive device for a supercharger of the present invention.

FIG. 2 is a partial cross-sectional view of a conventional supercharger. It should be noted that the rotary system is shown by upward-sloping hatching, and the fixed system is shown by downward-sloping hatching.

[Explanation of symbols]

 20 engine 23 hydraulic pump 24a, 24b flow path (circulation path) 25 hydraulic motor 27 supercharger

Claims (1)

[Claims] 1. A drive device for a supercharger for supercharging an engine, wherein a hydraulic pump connected to a rotary shaft of the engine, a hydraulic motor connected to the supercharger, and the hydraulic pump and the hydraulic motor are connected. A drive device for a supercharger, comprising: a circulation path for supplying / recovering fluid from the hydraulic pump to / from the hydraulic motor.