JP2001164943A - Fluid machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid machinery integrally equipped with a bypass flow passage. SOLUTION: This fluid machinery 1 comprises a pair of rotors 3, 5 accommodated in a housing 15 and meshed with each other, and a set of timing gears 26 fixed at one ends of the rotors 3, 5. The fluid machinery 1 is characterized by comprising: the bypass flow passage 35 formed on an outer wall 31b of a gear chamber 33 which accommodates the set of timing gears 26, and positioned near a portion where the gears are meshed with each other so that the bypass flow passage 35 communicates a suction port 15a and a discharge port 15b; and a valve unit 37 disposed in the middle portion of the bypass flow passage 35 to open and close the bypass flow passage 35 depending on operation states.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid machine used as a supercharger for an engine and the like, and more particularly to a bypass passage therefor.

[0002]

2. Description of the Related Art Conventional supercharger systems for engines include, for example, "Automechanic 1988 /
May Extra Number Issue ”(published by Naigai Publishing Co., Ltd.) 140
The page shown in FIG. 5 is disclosed.

[0003] As shown in FIG.
Reference numeral 1 denotes a roots type, which is belt-driven by a crankshaft (not shown) of the engine 203 via an electromagnetic clutch. The intake air of the engine 203 passes through the air cleaner 205, the air flow meter 207, the throttle valve 209, and the suction side duct 211, is sucked into the suction port 201 a of the supercharger 201, and further flows from the discharge port 201 b to the engine 203 through the supercharge side duct 213. Be paid.

When the supercharging pressure reaches a predetermined value, a bypass valve 215 disposed facing the supercharging duct 213 is opened, and supercharging air is passed through a bypass passage 217 to the suction duct 2.
11, and the supercharging pressure is suppressed to a predetermined value or less.

When the supercharger 201 is turned off, the electronic control unit (not shown) opens the bypass valve 215, and the intake air is supplied to the engine 203 through the bypass passage 217.

[0006]

However, according to the conventional structure, since the bypass passage 217 is constituted by a separate pipe from the supercharger 201, the number of steps for assembling the pipe increases. In addition, a separate bypass valve 21
5 is required to be assembled and held in a pipeline, which is disadvantageous in terms of space, and there is a problem that the degree of freedom in layout and configuration design is limited.

Therefore, an object of the present invention is to provide a fluid machine integrally provided with a bypass passage.

[0008]

According to a first aspect of the present invention, there is provided a motor vehicle comprising: a pair of rotors housed in a housing and meshing with each other; and both rotors fixed to one end of the rotors. A timing gear set for synchronously rotating the gears. The fluid machine is formed on an outer wall of a gear chamber accommodating the timing gear set, and is located near a meshing portion of the gear to communicate the suction port and the discharge port. It is characterized by having a bypass flow path and a valve unit provided in the middle of the bypass flow path and opening and closing the bypass flow path according to an operation state.

Therefore, since the bypass flow path is provided integrally with the housing, the bypass flow path is advantageously obtained in terms of space, and the degree of freedom in layout and structural design can be increased.

In addition, the number of man-hours for assembling the piping becomes unnecessary, and the mounting workability is improved.

Further, by providing the bypass passage in the outer wall of the gear chamber, the rigidity of the outer wall of the gear chamber is increased, so that it is possible to obtain an effect of preventing transmission of radiated sound generated by engagement of the timing gear set.

According to a second aspect of the present invention, in the fluid machine according to the first aspect, the valve unit is mounted on a projection surface of an end surface of the housing along a rotation axis direction of the rotor. It is characterized by the following.

Therefore, the same operation and effect as those of the first aspect can be obtained, and the valve unit is provided on the outer wall of the gear chamber in the middle of the bypass passage, and the end face of the housing extends along the axial direction of the rotor. When the housing is viewed from the axial direction of the rotor, the housing can be accommodated in the projection plane so as not to protrude. And the degree of freedom in configuration design can be increased.

According to a third aspect of the present invention, there is provided a fluid machine including a pair of rotors housed in a housing and meshing with each other, and a timing gear set fixed to one end of the both rotors and rotating the both rotors synchronously. A bypass channel communicating the suction port and the discharge port is provided along at least one peripheral wall of a substantially semicircular peripheral wall of the housing that houses the rotor, and a valve unit that opens and closes the bypass channel is provided. The bypass passage is provided at a substantially central portion in the longitudinal direction.

Therefore, since the bypass flow path is provided integrally with the housing, the bypass flow path is advantageously obtained in terms of space, and the degree of freedom in layout and structural design can be increased.

In addition, the number of man-hours for assembling the piping becomes unnecessary, and the workability of the installation is improved.

Further, when bypass passages are provided on both sides of the substantially semicircular side of the housing, the response to the opening and closing operation of the valve unit is further improved, the flow of the fluid becomes uniform, and the filling efficiency is improved. it can.

According to a fourth aspect of the present invention, there is provided the fluid machine according to any one of the first to third aspects, wherein the suction port side opening and the discharge port side opening of the bypass flow passage are connected to the rotor. Is provided outside of the outer shape of.

Therefore, the same operation and effect as the first to third aspects of the invention can be obtained, and the inflow and outflow of fluid into and from the bypass flow passage at the suction opening and the discharge opening side of the bypass flow passage. Since the rotor is not blocked, a good flow can be obtained, and generation of noise due to the pulsating flow can be prevented.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a view schematically showing a cross section of the present embodiment. 2 is a view taken in the direction of the arrow A in FIG. 1, and FIG. 3 is a sectional view taken along the line CC in FIG.

FIG. 1 shows a cross section including the drive shaft 7 of the drive side rotor 3 of the roots type supercharger 1 as a fluid machine in combination with another cross section.

The drive shaft 7 for supporting the drive-side rotor 3 is supported at its left and right ends by a housing body 15 (housing) and a plate 17 via bearings 11 and 13, respectively. A pulley 21 having a V-shaped groove is fixed to the left end of the drive shaft 7 by a key 23 and a nut 25, and the drive shaft 7 is driven by a belt by an engine crankshaft.

A drive-side timing gear 27 is fixed to the right end of the drive shaft 7 by a nut 29.
(See FIG. 3). As a result, the rotors 3 and 5 on the driving side and the driven side rotate synchronously. A cover 31 is attached to the outside of the plate 17, and a gear chamber 33 is provided between the plate 17 and the inner wall 31 a of the cover 31.

1 and 2, a suction port 15a is provided on the upper side of the housing body 15, and a discharge port 1 is provided on a lower side thereof.
5b is provided. Then, as shown in FIG. 1, the timing gear 27 on the drive side of the outer wall 31 b of the cover 31.
A bank-shaped convex wall portion 31c extending in the vertical direction in FIG. 2 through the vicinity of the meshing portion between the gear and the driven-side timing gear 28.
Are formed. As shown in FIG. 3, a bypass flow path 35 surrounded by an inner wall 31a and an outer wall 31b is formed inside the convex wall portion 31c, and the suction port 15a and the discharge port 1 are formed.
5b.

The opening 35a on the suction port side of the bypass passage 35
The opening 35b on the discharge port side is provided on the plate 17 and provided outside the outer shape of the rotors 3 and 5.

A valve unit 37 is mounted on the outer wall 31b of the cover 31 located in the middle of the bypass passage 35 along the rotation axis direction of the rotors 3 and 5, and opens and closes the bypass passage 35 according to an instruction from the controller 41. I do.

As described above, by providing the bypass passage 35, when the supercharging pressure of the supercharger 1 reaches a predetermined value, the valve unit 37 opens according to an instruction from the controller 41. Thereby, the bypass flow path 35 communicates,
The supercharged air on the discharge port 15b side returns to the suction port 15a through the bypass flow path 35, and the supercharging pressure is suppressed to a predetermined value.

When the engine is running at a low load, the valve unit 37 is opened by an instruction from the controller 41, and the intake air is sucked into the engine through the bypass passage 35. At this time, by turning off, for example, an electromagnetic clutch provided in the drive path of the supercharger 1,
The rotors 3 and 5 may not be rotated.

As described above, according to the present embodiment, since the bypass passage 35 is provided integrally with the housing 15, it is advantageous in terms of space and the degree of freedom in layout and structural design can be increased. it can.

Further, the man-hour for assembling the piping is not required, the workability of the mounting is improved, and the trouble such as designing a structure for assembling and holding the valve unit 37 to the piping is eliminated. Costs are reduced.

Since the bank-shaped convex wall portion 31c near the meshing portion of the timing gear 27 has the bypass passage 35 inside, the rigidity of the cover 31 is increased, so that radiated sound generated by meshing of the timing gear 27 is generated. Can be obtained.

It should be noted that the bypass passage 35 is formed not only in the bank-shaped convex wall portion 31c as in the above-described embodiment, but also over the entire width of the gear chamber 33 as shown by a dashed line in FIG. A heavy wall may be provided, so that transmission of radiated sound generated by engagement of the timing gear 27 can be further prevented.

Further, since the valve unit 37 is mounted in the middle of the bypass passage 35 along the rotation axis direction of the rotor 3 within the projection plane of the end face of the housing 15, the housing 15 is connected to the rotor 3, 5. When viewed from the axial direction, the projection fits within the projection plane and does not protrude, so that it is more advantageous in terms of space, and the degree of freedom in layout and configuration design can be increased.

The suction port side opening 3 of the bypass passage 35
5a and the discharge port side opening 35b are provided outside the outer shapes of the rotors 3 and 5, so that the suction port side opening 35a and the discharge port side opening 35b of these bypass flow paths enter the bypass flow path 35. Since the rotors 3 and 5 do not block the inflow and outflow of the fluid, a good flow can be obtained, and generation of noise due to the pulsating flow can be prevented.

Although the first embodiment has exemplified the roots type fluid machine, the invention is not limited to this.
The fluid machine may be, for example, of the Riesholm type.

An inner wall 31a provided on the cover 31
Alternatively, the outer wall 31b may be formed separately from the cover 31, and may be integrally attached to the cover 31, and in this case, the formation of the bypass passage 35 is facilitated.

[Second Embodiment] A second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a diagram schematically showing a partial cross section and appearance of the present embodiment. The roots type supercharger 101 is different from the first embodiment in the configuration of the bypass flow path, and the other configurations are the same as those in the first embodiment. Therefore, the differences will be described, and the repeated description will be omitted.

The right half of FIG. 4 shows a cross section orthogonal to the rotation axis of the supercharger 101 as a fluid machine, and the left half shows its appearance.

Along a semicircular outer peripheral wall of the housing main body 115 accommodating the rotors 103 and 105, a belt-like convex portion 115a extending over a predetermined width in the rotation axis direction of the rotors 103 and 105 along the left and right peripheral walls in FIG. Are formed. The convex wall portion 115a is formed in a double wall structure having inner and outer walls 115b and 115c.
5 are formed so as to surround them, and communicate the suction port 115d and the discharge port 115e.

The opening 135 on the suction port side of the bypass passage 135
a and the discharge port side opening 135b are provided outside the outer shapes of the rotors 103 and 105.

Although the bypass passages 135 are provided on the left and right sides of the housing body 115 in the second embodiment, they may be provided only on the left or right peripheral wall.

A valve unit 13 having a butterfly valve 136 at a substantially middle portion in the longitudinal direction of the bypass passage 135
7 is attached to open and close the bypass passage 135. Lever 1 fixed to the rotation axis of each butterfly valve 136
Reference numeral 38 is connected by an interlocking mechanism (not shown), and both butterfly valves 136 and 136 are simultaneously opened and closed.

With such a configuration, according to the present embodiment, since the bypass passage 135 is provided integrally with the housing 115, it is advantageous in terms of space, and the degree of freedom in layout and structural design is obtained. Can be increased.

In addition, the man-hour for assembling the piping is not required, the workability of the mounting is improved, and the valve unit 37 is not required.
This eliminates the hassle of designing a structure for assembling and holding the pipe to the piping, and also reduces the cost of manufacturing them.

Further, in this embodiment, in particular, the band-shaped convex wall portions 115a are provided on both sides of the substantially semicircular shape of the housing 115, and the bypass passages 135 are provided on both left and right sides. The response of the inflow and outflow of the fluid to the operation is good, the flow of the intake air is even, and the charging efficiency can be improved.

In addition, the suction port side opening 135a and the discharge port side opening 135b of the bypass flow path 135 are connected to the rotor 10
3 and 105, the fluid flows into and out of the bypass passage 135 through the rotors 103 and 105 at the suction opening 135a and the discharge opening 135b of the bypass passage 135. Is not obstructed, so that a good flow can be obtained and generation of noise due to the pulsating flow can be prevented.

Although the roots type fluid machine has been exemplified in the second embodiment, the invention is not limited to this.
The fluid machine may be, for example, of the Riesholm type.

Further, similarly to the first embodiment, a convex portion 115a provided along the peripheral wall of the housing body 115 is provided.
The inner wall 115b or the outer wall 115c may be formed separately from the housing main body 115, and may be integrally attached to the housing main body 115. In this case, the formation of the bypass passage 135 is facilitated.

[0049]

As is apparent from the above description, according to the first aspect of the present invention, since the bypass flow path is provided integrally with the housing, the bypass flow path can be advantageously obtained in terms of space and the layout can be improved. And the degree of freedom in configuration design can be increased.

In addition, the man-hour for assembling the piping is not required, and the workability of the mounting is improved.

Further, by providing the bypass passage in the outer wall of the gear chamber, the rigidity of the outer wall of the gear chamber is increased, so that an effect of preventing transmission of radiated sound generated by the meshing of the timing gear set can be obtained.

According to the invention described in claim 2, according to claim 1
And the valve unit is provided on the outer wall of the gear chamber in the middle of the bypass passage, and is mounted along the axial direction of the rotor in the projection plane of the end face of the housing. When the housing is viewed from the axial direction of the rotor, it can be accommodated in the projection plane of the rotor and can be prevented from protruding, so that the space can be advantageously obtained and the degree of freedom in layout and structural design can be increased. Can be.

According to the third aspect of the present invention, since the bypass flow path is provided integrally with the housing, the bypass flow path is advantageously obtained in terms of space, and the degree of freedom in layout and structural design can be increased. it can.

Further, the man-hour for assembling the piping is not required, and the mounting workability is improved.

When bypass passages are provided on both sides of the substantially semicircular side of the housing, the response to the opening and closing operation of the valve unit is further improved, the flow of the fluid becomes uniform, and the filling efficiency is improved. it can.

According to the fourth aspect of the present invention, the first aspect is provided.
The same effects as those of the inventions described in (1) to (3) are obtained, and at the suction port side opening and the discharge port side opening of the bypass flow path,
Since the rotor does not block the inflow and outflow of the fluid into the bypass flow path, a good flow can be obtained, and the generation of noise due to the pulsating flow can be prevented.

[Brief description of the drawings]

FIG. 1 is a view schematically showing a schematic cross section of a first embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a sectional view taken along line CC of FIG. 2;

FIG. 4 is a view schematically showing a schematic cross section and appearance of a second embodiment of the present invention.

FIG. 5 is a diagram showing a conventional supercharging system.

[Explanation of symbols]

 3, 5, 103, 105 Rotor 7 Rotating shaft 15, 115 Housing body (housing) 15a, 115d Suction port 15b, 115e Discharge port 17 Plate 26 Timing gear set 27, 28 Timing gear 31 Cover 31a, 115b Inner wall 31b, 115c Outer wall 31c, 115a Convex wall portion 33 Gear chamber 35, 135 Bypass flow path 35a, 35b, 135a, 135b Open 37, 137 Valve unit 41 Controller 136 Butterfly valve

Claims (4)

[Claims] 1. A fluid machine comprising: a pair of rotors housed in a housing and meshing with each other; and a timing gear set fixed to one end of the both rotors and synchronously rotating the rotors, wherein the timing gear set is A bypass passage formed on the outer wall of the gear chamber to be housed and located near the meshing portion of the gear and communicating the suction port and the discharge port; provided in the middle of the bypass passage; A fluid machine, comprising: a valve unit that opens and closes a bypass flow path. 2. The fluid machine according to claim 1, wherein the valve unit is mounted on a projection plane of an end face of the housing along a rotation axis direction of the rotor. machine. 3. A fluid machine comprising: a pair of rotors housed in a housing and meshing with each other; and a timing gear set fixed to one end of the both rotors and synchronously rotating the two rotors, wherein a suction port and a discharge port are provided. Is provided along at least one peripheral wall of a substantially semicircular peripheral wall of the housing that houses the rotor, and a valve unit that opens and closes the bypass passage is provided in a longitudinal direction of the bypass passage. A fluid machine characterized by being provided at a substantially central portion of a fluid machine. 4. The fluid machine according to claim 1, wherein a suction port side opening and a discharge port side opening of the bypass flow path are provided.
A fluid machine provided outside the outer shape of the rotor.