JPH06212987A - Mechanical supercharger - Google Patents

Abstract

PURPOSE:To surely adjust the phases of rotors mutually at the time of assembling and shorten the assembling time. CONSTITUTION:A first timing gear 22 having a helical toohed form on the outer peripheral part 22a is pressed in one end of a driving shaft 12, and a second timing gear 23 having a helical gear 23a meshed with the first timing gear 22, which is formed on the outer peripheral part 23a, is pressed in one end of a driven shaft 13.

Description

Detailed Description of the Invention

[0001]

[Object of the Invention]

[0002]

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

[0003]

2. Description of the Related Art Conventionally, as a supercharger of this type, for example, one disclosed in Japanese Patent Laid-Open No. 2-91492 is known.

As shown in FIG. 4, the housing 100
Inside, a drive shaft 101 and a driven shaft 102 are rotatably arranged. The drive shaft 101 is driven by a pulley 105 connected to a drive source such as a motor or an engine, and the driven force drives the driven shaft 102 in a direction opposite to the drive shaft 101. Drive shaft 10
1, around the driven shaft 102, respectively, the first rotor 103 and the second rotor 1 so that a predetermined phase is maintained.
04 is fixed. Bearings 107 and 109 are respectively supported on the left sides of the drive shaft 101 and the driven shaft 102 in the figure.
Bearings 108 and 110 are respectively supported on the right side of 01 and the driven shaft 102 in the drawing. Outer rings of the bearings 108 and 110 are fixed to a bearing housing 106 fixed to the housing 100.

A first timing gear 111 is fixed to the drive shaft 101 in the rotational direction by a key 114 so as to be located on the right side of the bearing 108 in the figure, and a nut 11 is formed with spacers 117 and 118 on both sides.
It is fixed in the axial direction by 5. A second timing gear 112 that engages with the first timing gear 111 is fixed to the driven shaft 102 in the rotational direction by a key 114, and spacers 117, 1 are provided on both sides.
It is fixed in the axial direction by a nut 115 with 18 in between. The timing gears 111 and 112 maintain the phases of the rotors 103 and 104. A cover 116 is fixed to the bearing housing 106 and covers the timing gears 111 and 112.

[0006]

In the above supercharger, the two shafts 101 and 102 are respectively formed with key grooves into which the keys 114 are inserted, so as to correspond to these key grooves. Timing gears 111 and 112
Also, a key groove will be formed in each case. Shaft 10
Key groove and timing gear 11 formed in 1, 102
When the positional accuracy with respect to the key grooves formed on the shafts 1 and 112 is poor, the timing gears 111 and 112 move the shafts 101 and 112, respectively.
When assembled to the rotor 102, the phases of the rotors 103 and 104 become improper. As a result, the rotor 103, which should be kept in a non-contact state during operation of the supercharger,
104 Comrades may come into contact with each other.

Therefore, in order to adjust the phases of the rotors 103 and 104 when assembling in the above supercharger, a helical gear is used on the outer periphery of the timing gears 111 and 112, and one of the timing gears 111 (or 112) is used. ) May be moved in the axial direction for assembly, but in that case, since the timing gears 111 and 112 are always clamped by the nut 115 via the spacers 117 and 118 on both sides (axial direction), 117 must be replaced with another spacer of different thickness. At this time, since it is necessary to remove the timing gear 111 (or 112) and the key 114, it takes a very long time for assembling. In addition, the bearing 108 (or 110) and the one timing gear 1
Since the precision of the spacer inserted between 11 (or 112) is also required, it is difficult to set the phases of the rotors 103 and 104.

Therefore, it is a technical object of the present invention to provide a supercharger in which the phases of the rotors can be reliably adjusted during assembly and the assembly time is short.

[0009]

[Constitution of the invention]

[0010]

In order to solve the above technical problems, the technical means (first technical means) taken in the invention of claim 1 is a drive shaft connected to a drive source, and a drive. The driven shaft is arranged parallel to the shaft and is driven by the drive shaft so as to rotate in a direction opposite to the drive shaft, the first rotor fixed around the drive shaft, and the first rotor fixed around the driven shaft. A second rotor, a first timing gear that is press-fitted to one end of the drive shaft and has a helical tooth shape on the outer peripheral portion, and a helical tooth shape that is press-fitted to one end of the driven shaft and engages with the first timing gear on the outer peripheral portion. A second timing gear having a drive shaft and a support shaft around the drive shaft so as to be located between the first rotor and the first timing gear. A first bearing that is, is to have a second bearing supported around the driven shaft so as to be positioned between the second rotor and the second timing gear.

In order to solve the above technical problems, a first aspect is provided.
Means taken in the invention of (2nd technical means)
In the above first technical means, gaps are formed between the first timing gear and the first bearing and between the second timing gear and the second bearing.

[0012]

According to the first technical means, the first timing gear having the helical tooth shape on the outer peripheral portion is press-fitted into one end of the drive shaft and the first timing gear is engaged with one end of the driven shaft. Since the second timing gear having a helical tooth shape is press-fitted in the outer peripheral portion, the following operation is performed.

Since it is not necessary to form a key groove for inserting a key in the two shafts and the two timing gears, the positional accuracy of the timing gear with respect to the shaft is not required. As a result, the phases of the rotors are unlikely to deviate from the proper values during assembly.

Further, if the phases of the rotors are unsuitable for some reason during assembly, it becomes possible to easily move one or both timing gears in the axial direction during assembly. As a result, the phases of the rotors are reliably adjusted and set to appropriate values.

Further, the number of parts such as the key, the key groove and the nut as in the prior art is reduced, and the assembly time is shortened and the cost is reduced accordingly.

According to the second technical means, since the gaps are formed between the first timing gear and the bearings and between the second timing gear and the second bearings, the phases of the rotors at the time of assembly are equal to each other. If it is inappropriate, one or both timing gears can be pushed into the bearing side, and the phases of the rotors can be adjusted easily compared to when the timing gears are moved (pulled) to the right in the figure. To be done.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view of a mechanical supercharger according to this embodiment.

As shown in FIG. 1, the mechanical supercharger 10 according to this embodiment relates to a positive displacement supercharger.
A drive shaft 12 and a driven shaft 13 are rotatably arranged in the housing 11. The drive shaft 12 is driven by a pulley 14 connected to a drive source (not shown) such as a motor and an engine, and the driven force of the drive shaft 12 causes the driven shaft 13 to move.
It is designed to be driven in the direction opposite to 2. A first rotor 15 and a second rotor 16 are fixed around the drive shaft 12 and the driven shaft 13, respectively, and these rotors 15 and 16 oppose each other in a state where a predetermined phase is maintained and in a non-contact state. It is designed to rotate in the direction. Drive shaft 12 and driven shaft 13
Bearings 17 and 18 are respectively supported on the left side of FIG.

Bearings (first bearings) 19 and bearings (second bearings) 20 are respectively supported on the right sides of the drive shaft 12 and the driven shaft 13 in the figure. The outer races of the bearings 19 and 20 are fixed to a bearing housing 21 fixed to the housing 11, and between the inner race of the bearing 19 and the protrusion 12a of the drive shaft 12 and between the inner race of the bearing 20 and the protrusion 13a of the driven shaft 13. A gap is formed between them. That is, the shaft 1 of the bearings 19 and 20
As a method of assembling the bearings 2 and 13, the bearings 19 and 20
With the outer ring of is fixed to the bearing housing 21,
The drive shaft 12 supporting the first rotor 15 and the drive shaft 13 supporting the second rotor 16 are press-fitted into the inner rings of the bearings 19 and 20 from the left side to the right side in the drawing, respectively. As a result, the clearance between the first rotor 15 or the second rotor 16 and the bearing housing 21 can be adjusted to an appropriate value.

A first timing gear 22 is press-fitted to the right end of the drive shaft 12 in the figure so as to be located on the right side of the bearing 19, and an outer peripheral portion 22a of the first timing gear 22 has a helical tooth shape. There is. A gap 24 is formed between the first timing gear 22 and the bearing 19. The second timing gear 23 is press-fitted to the right end of the driven shaft 13 in the drawing, and
The outer peripheral portion 23 a of the timing gear 23 has a helical tooth shape so as to engage with the first timing gear 22. A gap 25 is also formed between the second timing gear 23 and the bearing 20. A cover 26 is fixed to the right end of the bearing housing 21 in the figure to form a gear chamber 27.

FIG. 2 is a plan view of the first timing gear, and FIG. 3 is a plan view of the second timing gear.

As shown in FIGS. 2 and 3, the tooth shapes of the first timing gear and the second timing gear are twisted symmetrically. Therefore, the first timing gear 2
When 2 is moved to the left in the drawing, the first rotor 15 rotates clockwise as seen from the pulley 14 side. Further, when the second timing gear 23 is moved leftward in the drawing, the second rotor 16 rotates counterclockwise as viewed from the pulley 14 side. The twisting direction of each tooth profile may be the reverse of the above.

The operation of the supercharger 10 configured as above will be described.

When the drive source rotates, the drive shaft 12 rotates via the pulley 14.

Next, the first rotor 15 and the first timing gear 22 rotate, and the driving force of the first timing gear 22 is transmitted to the second timing gear 23 via the helical gears 22a and 23a. As a result, the driven shaft 13
Rotates in the opposite direction to the drive shaft 12, and the second rotor 16 rotates in the same direction as the driven shaft 13 in a non-contact state while maintaining a predetermined phase with the first rotor 15.

As described above, in this embodiment, the first timing gear 22 having the helical tooth shape on the outer peripheral portion 22a is press-fitted to the right end of the drive shaft 12 in FIG. 1 and the first timing gear is connected to one end of the driven shaft 13. 22
Since the second timing gear 23 having a helical tooth shape is press-fitted into the outer peripheral portion 23a so as to be engaged with, the two shafts 12 and 13 and the two timing gears 22 and 2 are
It is not necessary to form a key groove for inserting a key into the shaft 3, and the shafts 12 and 13 of the timing gears 22 and 23 are not necessary.
The position accuracy with respect to is no longer required. As a result, the phases of the rotors 15 and 16 are less likely to deviate from the proper values during assembly.

Also, for some reason in assembly, the rotor 1
If the phases of 5 and 16 are inappropriate, the timing gears 22 and 23 can be easily moved in the axial direction during assembly. That is, the drive shaft 12 supporting the first rotor 15 and the driven shaft 13 supporting the second rotor 16 are press-fitted into the inner rings of the bearings 19 and 20, respectively, and then the right ends of the shafts 12 and 13 in FIG. When the phases of the rotors 15 and 16 are checked from the left side of FIG. 1 by pressing the gears 22 and 23 in that state and the phases are inappropriate, the phases of the rotors 15 and 16 are changed from the left side of FIG. The phase is reliably adjusted by moving one timing gear 22 (or 23) in the axial direction while checking. As a result, the rotors 15 and 16
The phase of each other is set to an appropriate value.

Further, the number of parts such as the key, the key groove and the nut as in the prior art is reduced, and the assembling time is shortened and the cost is reduced accordingly.

Further, since the gaps 24 and 25 are formed between the first timing gear 22 and the bearing 19 and between the second timing gear 23 and the second bearing 20, respectively, the rotors 15 and 16 are assembled at the same time during the assembling. When the phase is inappropriate, the timing gear 22 (or 23) can be pushed into the bearing 19 or 20 side, and the timing gear 22 (or 23) is moved (pulled) to the right in the drawing. The phases of the rotors 15 and 16 can be easily adjusted as compared with.

[0031]

The present invention has the following effects.

If the phases of the rotors are unsuitable for some reason during assembly, it is possible to easily move one or both timing gears in the axial direction during assembly, and as a result, The phase of the rotors can be adjusted reliably and set to an appropriate value.

Further, the number of parts such as the key, the key groove and the nut can be reduced as in the prior art, and the assembling time can be shortened and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a mechanical supercharger according to this embodiment.

FIG. 2 is a plan view of a first timing gear according to the present embodiment.

FIG. 3 is a plan view of a second timing gear according to this embodiment.

FIG. 4 is a sectional view of a mechanical supercharger according to a conventional technique.

[Explanation of symbols]

 10 mechanical supercharger 12 drive shaft 13 driven shaft 15 first rotor 16 second rotor 19 bearing (first bearing) 20 bearing (second bearing) 22 first timing gear 22a outer peripheral portion of first timing gear 23 second Timing gear 23a Outer peripheral portion of the second timing gear 24 Gap 25 Gap

Claims (2)

[Claims] 1. A drive shaft connected to a drive source; a driven shaft, which is arranged parallel to the drive shaft and driven by the drive shaft so as to rotate in a direction opposite to the drive shaft; A first rotor fixed around the drive shaft; a second rotor fixed around the driven shaft; a first timing gear press-fitted into one end of the drive shaft and having a helical tooth shape on the outer peripheral portion; A second timing gear that is press-fitted to one end of the driven shaft and has a helical tooth shape on the outer periphery so as to engage with the first timing gear; and between the first rotor and the first timing gear. A first bearing supported around the drive shaft so as to be located, the second rotor and the second rotor. Mechanical supercharger, characterized in that a second bearing supported around the driven shaft so as to be positioned between the Mingugia. 2. The machine according to claim 1, wherein gaps are formed between the first timing gear and the first bearing and between the second timing gear and the second bearing. Type supercharger.