JPH08189369A - Mechanical supercharger - Google Patents

Abstract

PURPOSE: To prevent certainly a pinion shaft from coming off, while not deteriorating durability and reducing both the number of part items and a processing cost. CONSTITUTION: An air compressor 7 presurizes intake air and supplies it to an engine. A planetary gear acceleration mechanism 5 includes an internal gear 31 to which driving force of the engine is input, a sun gear 37 connected to a rotor shaft 35 of the air compressor 7, and a pinion shaft 41 which rotatably supports a pinion gear 33. The shaft 41 is fixed together with the other member 75 to a partition wall 73 between the air compressor 7 and the acceleration mechanism 5 by means of bolts 77, 79. The bolt 79 is arranged eccentrically from the center of the shaft 41.

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 supercharging a vehicle engine.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 3-500319 discloses a supercharger 201 as shown in FIG.
Japanese Patent Publication No. 5 discloses a supercharger 203 as shown in FIG. The supercharger 201 is a planetary drive for the driving force of the engine.
The turbocharger 203 is configured to drive the centrifugal air compressor 207 by increasing the speed with a gear type speed increasing device 205.
Is configured to drive the centrifugal air compressor 213 by increasing the driving force of the engine from the belt type continuously variable transmission 209 via the speed increasing device 211.

In the supercharger 201, the pinion shaft 217 for supporting the pinion gear 215 of the speed increasing device 205 is supported at one end by the casing 219, but there is a risk that it will fall out because it is not locked.

Therefore, in the supercharger 203, the speed increasing device 21
Pinion shaft 2 supporting the pinion gear 223 of No. 1
25 is secured with a ball 227 and a bolt 229. This ball 227 is pressed against the casing 231 from the notch of the hole of the pinion shaft 225 by the taper portion at the tip of the bolt 229, and the pinion shaft 2
25 are prevented from falling off.

[0005]

However, the ball 227 is to be solved.
With the retaining mechanism using the bolts 229, stress concentrates on the notches formed in the pinion shaft 225, and the durability of the pinion shaft 225 is reduced. When installing the retaining mechanism, the bolt 229 is tightened with the ball 227 attached to the notch with grease, but the ball 227 actually comes off from the notch. Instead of hitting the taper portion of the bolt 229, the ball 22 is moved in the axial direction of the pinion shaft 225 on the plane of the tip portion of the bolt 229.
The bolt 229 may be screwed in while the 7 is being pushed in. Moreover, it cannot be known from the outside that the retaining mechanism is not functioning properly, and the reliability of the assembling work is low. Further, the ball 227 and the bolt 2
The number of parts is 29, and the machining cost increases by machining the bolt holes and the notches in the pinion shaft.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a mechanical supercharger capable of reliably preventing the pinion shaft from coming off without lowering the durability and reducing the number of parts and the processing cost. .

[0007]

According to a first aspect of the present invention, there is provided a mechanical supercharger comprising: an air compressor for pressurizing intake air to supply it to an engine; an internal gear for inputting a driving force of the engine; A planetary gear type speed increasing mechanism having a sun gear connected to the rotary shaft and a pinion shaft rotatably supporting the pinion gear,
The pinion shaft, together with other members, is fixed to a partition wall between the air compressor and the speed increasing mechanism with a bolt.

The mechanical supercharger according to claim 2 is the mechanical supercharger according to claim 1, wherein the other member is a labyrinth member for preventing air leakage from the air compressor.

A mechanical supercharger according to a third aspect of the invention is the mechanical supercharger according to the first or second aspect, in which the screwing position of the bolt is eccentric from the center of the pinion shaft.

[0010]

In the mechanical supercharger according to the first aspect of the present invention, the pinion shaft of the planetary gear type speed increasing mechanism is fixed to the partition between the air compressor and the speed increasing mechanism by bolts together with other members.

Therefore, unlike the conventional example, the pinion shaft can be securely prevented from coming off without relying on the retaining mechanism by the ball and the bolt, and without processing the bolt hole or the notch in the pinion shaft. The number of parts and the processing cost are reduced, and the durability of the pinion shaft is improved. In addition to this, the fixing member for fixing other members can be eliminated, and the number of parts is further reduced.

A mechanical supercharger according to a second aspect of the present invention is the mechanical supercharger according to the first aspect, in which the pinion shaft is fixed by a bolt together with a labyrinth member, which is another member, for relieving the pressure on the rear surface of the rotor. The bolts that have been conventionally used to fix the labyrinth member are omitted, and the number of parts is reduced.

A mechanical supercharger according to a third aspect of the present invention is the mechanical supercharger invention according to the first or second aspect, in which the screwing position of the bolt is eccentric from the center of the pinion shaft. Thus
It is possible to prevent the pinion shaft from rotating without using any special rotation preventing means, and it is possible to prevent loosening of the bolt or dropping of the pinion shaft due to rotation of the pinion shaft.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 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.

FIG. 1 shows a mechanical supercharger 1 of the embodiment and an input plug.
3 is shown. The mechanical supercharger 1 includes a planetary gear type speed increasing mechanism 5 and a centrifugal air compressor 7.
It consists of and.

The input pulley 3 is formed by fixing the main body 9 and the hub 11 with bolts 13, and is fixed to the input shaft 15 of the speed increasing mechanism 5 with a key 17 and a nut 19. The input pulley 3 is connected to the crankshaft side pulley via a belt.
It is connected to the engine and is driven to rotate by the driving force of the engine. The input shaft 15 is supported by a boss portion 25 of a casing 23 by a bearing 21, and a seal 27 is arranged between the input shaft 15 and the casing 23.

The speed increasing mechanism 5 includes an internal gear 31 formed integrally with the input shaft 15 via a flange portion 29,
Two pinion gears 33 arranged at equal intervals in the circumferential direction,
A sun gear 37 formed on the impeller shaft 35 (rotor shaft) of the air compressor 7 is provided. The pinion gear 33 is supported by a pinion shaft 41 via a bearing 39. The pinion shaft 41 penetrates the flange member 43 of the casing 23,
It is supported by 3. The bearing 39 is positioned on the pinion shaft 41 by the snap ring 45 and the washer 47, and the pinion gear 33 is positioned by the snap rings 49 and 51.

A sun gear 37 is attached to the impeller shaft 35.
From the right side, the rings 53, 55, spacers 57, bushes 59, and impeller 61 are mounted and fixed with nuts 63. In addition, the compressor case of the air compressor 7
The sing 65 is fixed to the casing 23 together with the flange member 43 by a connecting member 69 engaged with the circumferential groove 67 of the casing 23 and a bolt 71. An O-ring 68 is arranged between the casing 23 and the flange member 43 to prevent oil leakage.

The speed increasing mechanism 5 speeds up the engine driving force input from the input pulley 3 to the internal gear 31 through the pinion gear 33 and the sun gear 37, and rotationally drives the impeller shaft 35. The air compressor 7 supercharges the engine by pressurizing intake air by the rotation of the impeller 61.

The speed increasing mechanism 5 and the air compressor 7 are partitioned by a partition wall portion 73 of the flange member 43, and a labyrinth seal 75 (labyrinth member: another member) is provided between the partition wall portion 73 and the impeller 61. It is arranged. This labyrinth seal 75 is fixed to the partition wall portion 73 by two bolts 77 as shown in FIG.
It is fixed to the right end surface of the pinion shaft 41.

The pinion shaft 41 is thus prevented from coming off from the flange member 43 by fixing the labyrinth seal 75 at the right end. Further, as shown in FIG. 2, the bolt 79 is screwed at a position eccentric from the center of the pinion shaft 41 to prevent the pinion shaft 41 from rotating.

The labyrinth seal 75 is provided with a groove 81 having a saw-tooth cross section. A labyrinth 83 is formed between the groove 81 and the impeller 61, and the air pressure of the air compressor 7 is reduced by the pressure reducing action. ing.

The bearing holder 8 is attached to the flange member 43.
5 is press-fitted and fixed to the flange member 43 by the step portion 87 and the retaining ring 89. Bearing holder 85
A space 91 between the flange member 43 and the impeller 61.
Are formed.

The mechanical supercharger 1 is arranged on the downstream side of the throttle valve, and the downstream side of the throttle valve and this space 91 communicate with each other through a bypass passage 93 and a control valve. When the throttle valve is closed and a negative pressure is generated on the right side of the impeller 61, the control valve opens the space 91 to the atmosphere and always keeps the positive pressure.

As shown in FIG. 1, the bearing holder 85 comprises a cylindrical portion 95 and a conical convex portion 97, and the convex portion 97 has a slight gap in a conical concave portion 99 formed on the input shaft 15 side. Have penetrated. On the impeller shaft 35,
The sliding bearing 101 is arranged on the left side of the sun gear 37,
Slider bearings 103 are arranged on the outer periphery of the spacer 57, and support the impeller shaft 35 between the inner periphery of the convex portion 97 and the inner periphery of the cylindrical portion 95, respectively. Further, the thrust plate 1 is attached to the bearing holder 85 from the outside in the radial direction.
05 is attached and is fixed by a bolt 107. The thrust plate 105 engages with the groove 109 formed between the rings 53 and 55 and receives the thrust force of the impeller shaft 35.

Between the slide bearings 101, 103 and the bearing holder 85, an oil passage 111 formed through the bearing holder 85 and the flange member 43, an external oil pump via a nozzle 113 and an oil plug 115. Pressurized oil is supplied from, and an oil film damper is formed. The slide bearings 101 and 103 are floating-supported by the oil film damper, and support the impeller shaft 35 while absorbing vibrations. This pressurized oil is also supplied to the groove 109 to lubricate the sliding portion with the thrust plate 105.

A seal 117 and a piston ring 119 are arranged between the bearing holder 85 and the bush 59 to form a contact type oil seal 121, and oil leakage from the casing 23 and air compressor 7 are performed. It prevents the air leakage from. As described above, since the space 91 is always kept at a positive pressure and does not become a negative pressure, this oil seal 1
The burden on 21 is reduced, and the leak prevention function works effectively.
Thus, the mechanical supercharger 1 is configured.

As described above, in the mechanical supercharger 1, the pinion shaft 41 and the labyrinth seal 75 are fixed to the partition wall 73 of the casing 23 by the bolts 77 and 79.

Therefore, the pinion shaft 41 can be prevented from coming off without relying on the retaining mechanism by the ball 227 and the bolt 229 as in the conventional example, and without processing the bolt hole or the notch in the pinion shaft 41. Therefore, the pinion shaft 41 can be reliably prevented from coming off, the number of parts and the processing cost are reduced, and the durability of the pinion shaft 41 is improved. In addition to this, the conventional labyrinth seal 7
The bolt used to fix 5 was also abolished,
Further, the number of parts is reduced.

Further, since the screwing position of the bolt 79 is eccentric from the center of the pinion shaft 41, the pinion shaft 41 is prevented from rotating without using any special rotation preventing means. In this way, the bolt 79 is prevented from loosening around the pinion shaft 41 and the pinion shaft 41 is prevented from falling off.

Unlike the embodiment, the pinion shaft may be fixed to the labyrinth member by passing a long bolt through the partition without passing through the partition between the air compressor and the speed increasing mechanism.

The air compressor is not limited to the centrifugal type, but may be, for example, a roots type or a screw type.

[0033]

According to the mechanical supercharger of the first aspect of the present invention, the pinion shaft of the planetary gear type speed increasing mechanism is fixed to the casing with other members by bolts.

Therefore, unlike the conventional example in which the pinion shaft is formed with a bolt hole or a notch to prevent the pinion shaft from coming off with a ball and a bolt, the pinion shaft can be reliably prevented from coming off, and the number of parts and the processing cost are increased. Is reduced, and the durability of the pinion shaft is improved. In addition to this, the fixing member for fixing other members is also abolished, and the number of parts is further reduced.

A mechanical supercharger according to a second aspect of the present invention is the mechanical supercharger of the first aspect, in which the pinion shaft is fixed together with a labyrinth member, which is another member, by a bolt, and is conventionally used for fixing the labyrinth member. The used bolts are omitted, and the number of parts is reduced.

A mechanical supercharger according to a third aspect of the present invention is the mechanical supercharger invention according to the first or second aspect, in which the screwing position of the bolt is eccentric from the center of the pinion shaft and no special rotation preventing means is used. Prevent the pinion shaft from rotating,
Prevent loosening of bolts and dropout of pinion shaft.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a mechanical supercharger of an embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

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

FIG. 4 is a sectional view of another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mechanical supercharger 5 Planetary gear type speed-up mechanism 7 Centrifugal air compressor (compressor) 31 Internal gear 33 Pinion gear 35 Impeller shaft (rotor shaft) 37 Sun gear 41 Pinion shaft 73 Partition wall 75 Labyrinth seal (Labyrinth material: other material) 77, 79 bolts

Claims (3)

[Claims] 1. An air compressor for pressurizing intake air to supply it to an engine, and an interface for inputting a driving force of the engine.
A planetary gear type speed increasing mechanism having a null gear, a sun gear connected to the rotor shaft of the air compressor, and a pinion shaft that rotatably supports the pinion gear, the pinion shaft together with other members. A mechanical supercharger characterized by being fixed to a partition wall between the speed increasing mechanism and the speed increasing mechanism with a bolt. 2. The mechanical supercharger according to claim 1, wherein the other member is a labyrinth member for preventing air leakage from the air compressor. 3. The mechanical supercharger according to claim 1, wherein the screwing position of the bolt is eccentric from the center of the pinion shaft.