JPH0658158A - Mechanical supercharger - Google Patents

Abstract

PURPOSE:To provide a mechanical supercharger which prevents a supercharger from rotating in a state that the bearing of an impeller shaft is rendered short in oil, simplifies constitution, and is reduced in the weight and cost. CONSTITUTION:A mechanical supercharger 1 comprises a supercharger 5 driven by an engine through a speed-increasing mechanism 3, an engine-driven oil pump 93 to feed oil to a bearing 71 which is designed to support the impeller shaft 57 of the supercharger 5, a clutch 7 located between the engine and the speed-increasing mechanism 3, and an actuator 9 to intercouple the oil pump 93 and the hydraulically-operated clutch 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical supercharger for an engine.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 3-500564 discloses a mechanical supercharger 201 as shown in FIG. this is,
The supercharger 205 is configured to be driven by the engine via the speed increasing mechanism 203 and rotates at high speed.
The bearing that supports the impeller shaft 207 of No. 05 is supplied with oil and lubricated by an oil pump driven by the engine.

[0003]

Therefore, when the oil pressure of the oil pump is not sufficiently increased, such as when the engine is started, the impeller shaft 207 is in an oil-deficient state.
Will rotate at high speed, and the bearing will be easily damaged. This phenomenon is especially noticeable when the car has not been used for a long time.
An electromagnetic clutch 209 is provided to disconnect the supercharger 205 from the engine, but the electromagnetic clutch 209 is heavy and expensive. In addition, a control means for releasing the connection of the electromagnetic clutch 209 and protecting the supercharger 205 at the time of starting the engine is required.

Therefore, an object of the present invention is to provide a lightweight and inexpensive mechanical supercharger capable of protecting a bearing without using special control means for avoiding rotation of the impeller shaft when the bearing is low in oil. To do.

[0005]

A mechanical supercharger according to a first aspect of the present invention includes a supercharger driven by an engine through a speed increasing mechanism,
An engine-driven oil pump that supplies oil to a bearing that supports an impeller shaft of a supercharger, a clutch provided between the engine and a speed increasing mechanism, and an actuator that connects the clutch by the oil pressure of the oil pump. It is characterized by having and.

A mechanical supercharger of a second invention is characterized in that the mechanical supercharger of the first invention is provided with a control valve for adjusting a hydraulic pressure from an oil pump to an actuator.

[0007]

According to the first aspect of the invention, when the engine is started, the oil pressure of the oil pump rises to supply oil to the bearing of the impeller shaft, and the oil pressure also actuates the actuator to connect the clutch to drive the supercharger by the engine. . Therefore, since the bearing of the impeller shaft of the supercharger is not driven in the state of insufficient oil, the bearing is not damaged. As described above, since the bearing is basically protected, the control means for disengaging the clutch when there is a risk of bearing damage is not required, and the structure is simple.
Further, it is lightweight and inexpensive because it does not use an electromagnetic clutch.

In the second invention, in addition to the structure of the first invention, a control valve is arranged between the oil pump and the actuator so that the supercharger can be stopped when supercharging is unnecessary. In addition to the effect of the invention, an effect of improving engine fuel consumption can be obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the second invention will be described with reference to FIGS. FIG. 1 shows a mechanical supercharger 1 of this embodiment.
Hereinafter, the left and right directions are the left and right directions in FIG. 1, and members and the like without reference numerals are not shown.

As shown in FIG. 1, the mechanical supercharger 1 includes a speed increasing mechanism 3, a supercharger 5, a multi-plate clutch 7 (clutch), an actuator 9, a control valve 11 and the like.

The pulley 13 is supported by the input shaft 19 via bearings 15 and 17, and a lock nut 21 of the bearing 15 is screwed to the left end of the input shaft 19.
As shown in FIG. 2, the pulley 13 is connected to another pulley 25 via a belt 23, and this pulley 25 is connected to a crankshaft 29 of an engine 27. As shown in FIG. 1, the input shaft 19 is supported by a casing 33 of the speed increasing mechanism 3 via a bearing 31. A seal 35 for preventing oil leakage from the casing 33 is mounted between the left end of the casing 33 and the input shaft 19.

A hub 37 is arranged between the pulley 13 and the casing 33 and is spline-connected to the input shaft 19. The multi-plate clutch 7 is arranged between the pulley 13 and the hub 37. Pressing ring 3 on the right side of the multi-plate clutch
9 is arranged, and a return spring 41 for urging the pressing ring 39 to the right is arranged between the pressing ring 39 and the pulley 13. The pressing ring 39 is in contact with the piston 45 via the bearing 43, and the piston 45 engages with the cylinder 47 formed in the casing 33 via the O-rings 49 and 51 to form the actuator 9.

As will be described later, when the hydraulic pressure is applied to the actuator 9, the multi-plate clutch 7 is pressed and engaged by the pressing ring 39, and when the supply of the hydraulic pressure is stopped, the multi-plate clutch 7 is opened by the return spring 41. To be done. When the multi-plate clutch 7 is engaged, the input shaft 19 becomes the engine 27.
When the multi-disc clutch 7 is released, the input shaft 19 is separated from the engine 27.

The speed increasing mechanism 3 is of a planetary gear type, the internal gear 53 is formed at the right end portion of the input shaft 19, and the sun gear 55 is the impeller shaft 5 of the supercharger 5.
It is formed at the left end of 7. The pinion gear 59 is supported by the pinion shaft 63 via a bearing 61, and the pinion shaft 63 is supported by the flange portion 65 of the casing 33. The driving force of the engine 27 input to the internal gear 53 via the input shaft 19 is increased from the pinion gear 59 via the sun gear 55 to rotate the impeller shaft 57 at high speed.

The supercharger 5 is a centrifugal compressor,
The impeller 67 is attached to the right end of the impeller shaft 57 and is locked by a nut 69. The impeller shaft 57 is supported by the flange portion 65 via a unit bearing 71 and an oil film damper 73. The oil film damper 73 is an oil film formed between the outer race 75 of the unit bearing 71 and the flange portion 65, and absorbs vibrations of the sun gear 55 due to meshing, rotational vibrations of the impeller 67, and the like. Prevent damage. A seal 77 is arranged between the impeller shaft 57 and the outer race 75. or,
The compressor housing 79 is fixed to the casing 33 together with the flange portion 65 by the connecting member 83 engaged with the circumferential groove 81 of the casing 33 and the bolt 85.

The supercharger 5 is connected to the engine 2 via the speed increasing mechanism 3.
7 and supplies the pressurized intake air to the engine 27.

An oil plug 87 and a nozzle 89 connected thereto are attached to the casing 33, and the oil plug 87 is connected to an oil pump 93 via an oil line 91. As shown in FIG. 2, the oil pump 93 is rotationally driven by the crankshaft 29 via the belt transmission mechanism 95. When the oil pump 93 rotates and the oil pressure in the oil line 91 rises, the oil is supplied from the nozzle 89 to the oil film damper 73 via the oil passage 97 to form an oil film, and further via the oil passages 99 and 101, the unit bearing. It is supplied to 71 to lubricate it.
Also, the unit bearing 71 and the oil film damper 7
The oil from 3 is supplied to each gear meshing portion of the speed increasing mechanism 3, the bearing 61, and the like.

From the oil line 91 to the oil line 10
3 is branched and connected to the actuator 9, and a control valve 11 is provided in the oil line 103. Control valve 11 is oil tank 1
The oil pump 93 with the drain 107 on the 05 side closed
And a position for discharging the oil of the actuator 9 to the oil tank 105 with the oil pump 93 side closed, and this switching is performed by the controller. When hydraulic pressure is sent to the actuator 9, the multi-plate clutch 7 is engaged and the supercharger 5 is driven, and the oil in the actuator 9 is transferred to the oil tank 105.
When discharged, the multi-plate clutch 7 is released and the rotation of the supercharger 5 is stopped.

When the engine 27 starts, the oil pump 9
The hydraulic pressure of 3 rises and immediately the oil film damper 73
An oil film is formed on the surface and the unit bearing 71 is lubricated. At this time, the control valve 11
Is switched to the actuator 9 side, the supercharger 5 rotates. As described above, when the supercharger 5 is rotationally driven, oil is already supplied to the unit bearing 71, the oil film damper 73, the gear meshing portions, and the like.
Since the supercharger 5 does not rotate in a state where the oil is insufficient, damage to the rotating parts and the like due to the oil shortage does not originally occur. If supercharging is not required, control valve 1
If the operation of the supercharger 5 is stopped by 1, the fuel consumption can be improved.

Further, the control means for stopping the rotation of the supercharger 5 when the oil is insufficient is not required, and since the electromagnetic clutch is not used, the structure is simple and the weight is low.

Excluding the control valve 11 from the structure of this embodiment is an example of the first invention, similarly, damage to the bearing due to lack of oil is prevented, and the structure is simple, lightweight and inexpensive.

[0022]

According to the mechanical supercharger of the present invention, the bearing of the impeller shaft is lubricated by the engine-driven oil pump, and the clutch connecting the supercharger and the engine side is operated by an actuator. It was configured to work with. Therefore, the supercharger is basically prevented from rotating in the state of insufficient oil, the bearing is protected, and the structure is simple and lightweight. Further, in the configuration provided with the control valve, the supercharger can be disconnected when supercharging is unnecessary, and fuel consumption can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a second invention.

FIG. 2 is a block diagram showing the configuration of this embodiment.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

 1 Mechanical supercharger 3 Speed-up mechanism 5 Supercharger 7 Multi-plate clutch (clutch) 9 Actuator 11 Control valve 27 Engine 57 Impeller shaft 71 Unit bearing 93 Oil pump

Claims (2)

[Claims] 1. A supercharger driven by an engine via a speed increasing mechanism, an engine driven oil pump for supplying oil to a bearing supporting an impeller shaft of the supercharger, and an engine and a speed increasing mechanism. A mechanical supercharger comprising: a clutch interposed therebetween; and an actuator that connects the clutch by hydraulic pressure of the oil pump. 2. The mechanical supercharger according to claim 1, further comprising a control valve for adjusting a hydraulic pressure from the oil pump to the actuator.