JPH07286588A - Screw type supercharger - Google Patents

Abstract

PURPOSE:To supply oil to shaft bearing parts on the suction side of rotors, and improve durability of the shaft bearing parts by providing lubrication oil passages at shaft core parts of the rotors respectively, communicating one end part of each lubrication oil passage with a needle bearing part, and providing a passage to communicate the pair of the needle bearing parts with each other. CONSTITUTION:In a supercharger, a pair of a male and a female rotors 9, 11 rotatably contained in a casing 1 are rotated by power transmitted to a pulley 59 through timing gears 37, 45, a large and a small gears 53, 39, etc., in a gear casing 5. Suction side shaft bearing parts of the rotors 9, 11 are composed of needle bearings 29, 31. In this case, lubrication oil passages 89, 91 are provided at shaft core parts of the rotors 9, 11, one end parts of the lubrication passages 89, 91 are communicated with the needle bearings 29, 31, and both needle bearings 29, 31 are communicated with each other by a passage 93. Lubrication oil is introduced to the lubrication oil passages 89, 91 by oil introducing members 97, 99.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw type supercharger for driving a pair of male and female screw-shaped rotors to pump air to supercharge an internal combustion engine or the like.

[0002]

2. Description of the Related Art Conventionally, as a machine similar to this kind of machine, there is a screw type fluid machine as described in, for example, JP-A-2-153285.

As shown in FIG. 3, this is a casing 2
In 01, a pair of screw-shaped male and female rotors 203, 205,
The casing 201 and the rotors 203, 20 are arranged so as to mesh with each other with a slight gap so as not to contact each other.
5, both ends of rotor shafts 207 and 209 integrated with the bearing 5 are bearings 21.
Casing 201 via 1, 213, 215, 217
It is rotatably supported by.

One end of each rotor shaft 207, 209 is overhung from the bearings 215, 217 on the discharge side of the rotor 203, 205, a timing gear 219 is provided at the end of the female rotor shaft 207, and a male rotor shaft 209 is provided. At the end,
Timing gear 22 meshing with the timing gear 219
1 is provided for each.

Further, a small gear 223 of the speed increasing gear is provided at the tip of the overhang at one end of the female rotor shaft 207 and meshes with a large gear 227 of the speed increasing gear provided at one end of the input shaft 225. ing.

The timing gears 219 and 221 and the small gear 223 and the large gear 227 of the speed increasing gear are the casing 20.
A chamber 2 defined by a bearing casing 229, which is one partition wall
It is arranged in 31 and lubricating oil is enclosed in this chamber 231.

The input shaft 225 has a bearing 201 in the casing 201.
A pulley 235 is rotatably supported via 33 and the other end thereof is provided with a pulley 235.

According to such a screw type fluid machine, the rotational force input from the pulley 235 to the input shaft 225 is accelerated by the large gear 227 and the small gear 223 of the speed increasing gear and is passed through the female rotor shaft 207. Is transmitted to the female rotor 203, and also from the female rotor shaft 207 to the timing gear 21.
The male rotor 20 via the male rotor shaft 209 and the male rotor shaft 209.
5 are transmitted in synchronization with each other.

A pair of male and female rotors 203, 205
Rotates while meshing with the casing 201 and without coming into contact with each other, and pumps the air sucked from the suction side to the discharge side.

[0010]

By the way, in this type of screw type fluid machine, in order to reduce air resistance on the air intake side, a bearing for supporting the rotor shaft on the intake side of each rotor, such as a needle bearing, is used. The support is made compact by constructing. The lubrication of the needle bearing has a grease-filled structure, and the grease previously filled in the bearing is used for lubrication.

The screw type fluid machine according to the above-mentioned conventional example is also constructed in the same manner, and the rotor shafts 207, 20 of the bearing casing 229 on the discharge side of the rotors 203, 205 are the same.
The bearings 215 and 217 of No. 9 are configured to be lubricated by the lubricating oil of the chamber 231 that is scraped up by the rotation of the speed increasing gear 227, while the bearings 211 of the rotor shafts 207 and 209 on the suction side of the rotors 203 and 205 are provided. , 21
No. 3 is configured to be lubricated by the grease previously sealed in the bearings 215 and 217.

However, since such grease-filled lubrication has a limited life of grease, the durability of the bearing was not sufficient.

The present invention has been made to solve the above-mentioned conventional problems.
It is an object of the present invention to provide a screw type supercharger capable of supplying lubricating oil to the bearing portion on the suction side of a rotor and improving the durability of the bearing portion.

[0014]

In order to solve the above-mentioned problems, the invention according to claim 1 accommodates a pair of screw-shaped male and female rotors and the rotor, and each rotor shaft of the rotors is provided with a bearing portion. The rotor includes a casing rotatably supported, timing gears respectively provided on the rotor shafts and meshing with each other, and a speed increasing mechanism for speeding up the rotation input to the input shaft and transmitting the speed to the female rotor. In the screw type supercharger in which the bearing portion on the suction side is composed of a needle bearing and the timing gear and the speed increasing mechanism are housed in a gear casing filled with lubricating oil, the lubricating oil is applied to the shaft core of the rotor. A passage is provided, one end of each lubricating oil passage is connected to the needle bearing portion, and a passage that connects both needle bearing portions is provided.

According to a second aspect of the present invention, in the screw type supercharger according to the first aspect, the passage is provided in a rib that connects between bearing housings accommodating both needle bearings. .

According to a third aspect of the present invention, in the screw type supercharger according to the first and second aspects, an oil introducing member for introducing lubricating oil is provided at the other end of each lubricating oil passage. .

According to a fourth aspect of the present invention, in the screw type supercharger according to the third aspect, the oil introducing member is fitted in the other end of the lubricating oil passage of the female rotor and fixed in the rotational direction. It is characterized in that it is configured by a spiral member and a spiral member that is connected to the input shaft and has one end inserted into the other end of the lubricating oil passage of the male rotor so as to be relatively rotatable.

[0018]

According to the first aspect of the invention, the lubricating oil can be supplied from the lubricating oil passage of each rotor to both needle bearing portions on the suction side of the rotor, and the oil lubrication of both needle bearings can be performed.

Further, the lubricating oil circulates from the lubricating oil passage of the female rotor to the lubricating oil passage of the male rotor via the passage communicating the both needle bearing portions, and the lubricating oil is surely supplied to both needle bearing portions.

According to the second aspect of the present invention, the strength of both bearing housings can be reinforced by the rib connecting the both bearing housings.

According to the third aspect of the invention, the lubricating oil scraped up by the rotation of the speed increasing mechanism and the timing gear is received by the oil introducing member and introduced into the lubricating oil passage, so that the lubricating oil is sufficiently supplied to the lubricating oil passage. Can lead to.

According to the fourth aspect of the invention, the female rotor-side spiral member receives the lubricating oil scraped up by the rotation of the speed increasing mechanism and the timing gear, and the female rotor lubricating oil follows the spiral of the spiral member. On the other hand, since the male rotor side spiral member guides the male rotor lubricating oil passage along the spiral of the male rotor side, the male rotor lubricating oil passage is extended from the female rotor lubricating oil passage. The circulation of lubricating oil to and from it becomes smooth and reliable.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front sectional view of a screw type supercharger according to an embodiment of the present invention, and FIG. 2 is a side view seen from the direction C in FIG.

The casing 1 is composed of an axially divided rotor casing 3, a gear casing 5 and a cover 7. Inside the rotor casing 3, a pair of screw-shaped male and female rotors 9 and 11 are arranged. So that it does not come in contact with
Both ends of rotor shafts 13 and 15 integrated with the rotors 9 and 11 are rotatably supported by the rotor casing 3 and the gear casing 5 via bearing portions 17, 19, 21 and 23.

On the suction side of the rotors 9, 11, the rotor shaft 13,
Bearing part 1 for supporting one end of 15 on the rotor casing 3
7, 19 are constituted by needle bearings 29, 31 incorporated in bearing housings 25, 27.

The bearings 21, 23 for supporting the other ends of the rotor shafts 13, 15 on the gear casing 5 on the discharge side of the rotors 9, 11 are composed of ball bearings 33, 35 and the like.

The other ends of the rotor shafts 13 and 15 on the discharge side of the rotors 9 and 11 are overhung in the gear casing 5 by the bearings 21 and 23, and the shaft ends of the female rotor shaft 13 are at the ends. , The timing gear 37 and the small gear 39 constituting the speed increasing mechanism are arranged in this order from the discharge side of the rotor 9.
It is fixed with a nut 43 via a key 41.

A timing gear 45 meshing with the timing gear 37 is fixed to the shaft end of the male rotor shaft 15 with a nut 49 via a lock washer 47.

The small gear 39 of the female rotor shaft 13 is a large gear 5 which is integrally formed with the input shaft 51 and constitutes a speed increasing mechanism.
Meshed with 3.

The input shaft 51 is rotatably supported via a bearing portion 57 which is arranged on the same axis as the male rotor 15 and which includes a cover 7 and a ball bearing 55.
A pulley 59 is provided at the other end of the input shaft 51.

The pulley 59 is spline-coupled to the tip of the input shaft 51, is fixed by a bolt 61, and is constituted by a ball bearing or the like on the outer periphery of a support boss 65 attached to the cover 7 via a bolt 63. It is rotatably supported via a bearing 67.

The ball bearings 33 and 35 for supporting the other ends of the rotor shafts 13 and 15 have their one end faces slightly projected into the gear casing 5 and fixed through a holding metal 69 as a holding member and a screw 71. In addition, the ball bearing 55 that supports the input shaft 51 has one end surface that is connected to the gear casing 5.
By slightly projecting it inward and fixing it through a pressing metal fitting 73 as a pressing member and a screw 75, the overall length of the machine is made compact.

Lip seals 77 and 79 as contact seals are provided on the rotor shafts 13 and 15 between the ends of the rotors 9 and 11 on the suction side and the bearings 17 and 19, respectively. There is. These lip seals 77, 79
Is attached to the housings 25 and 27, and the sleeve 7
It is designed to come into contact with the outer circumference of 8,80.

In addition, the ends of the rotors 9 and 11 on the discharge side,
Sleeves 81 and 83 are fitted to the rotor shafts 13 and 15 between the bearings 21 and 23, respectively, and lip seals 85 and 87 as contact seals are provided between the sleeves 81 and 83 and the gear casing 5. It is provided. These lip seals 85 and 87 are attached to the gear casing 5 and come into contact with the outer circumferences of the sleeves 81 and 83.

In this embodiment, the needle bearings 29 and 31 for supporting the rotor shafts 13 and 15 on the suction side of the rotors 9 and 11 can be oil-lubricated.

That is, the lubricating oil passages 89 and 91 are respectively penetrated through the shaft core portions of the rotor shafts 13 and 15, and the suction side ends of the rotors 9 and 11, which are one end sides of the lubricating oil passages 89 and 91, are The needle bearings 29 and 31 incorporated in the bearing housings 25 and 27 are in communication with each other.

Further, both needle bearings 29, 31
The parts are connected by a passage 93. This passage 93
Is formed in a rib 95 that connects the bearing housings 25 and 27 together. The rib 95 is provided to reinforce the strength of both bearing housings 25 and 27.

On the other hand, at the other end of the lubricating oil passages 89, 91 on the discharge side of the rotors 9, 11, the lubricating oil passages 89, 91 are provided.
Oil introducing members 97, 9 for introducing oil into 91
9 are provided respectively.

The oil introducing portion 97 provided in the lubricating oil passage 89 of the female rotor shaft 13 is formed by a spiral member 101 having a spiral groove on the outer periphery, and one end is fitted into the end portion of the lubricating oil passage 89 to rotate. The other end is rotatably inserted into the insertion hole 103 formed in the cover 7 while being fixed in the direction.

On the other hand, the oil introducing member 99 provided in the lubricating oil passage 91 of the male rotor shaft 15 is formed of a spiral member 105 having a spiral groove on the outer circumference, and is connected to the input shaft 51 by a bolt 109 via a connecting spacer 107. Fixed with the lubricating oil passage 91
It is rotatably inserted at the end of.

The insertion hole 103 of the spiral member 101 provided in the cover 7 also functions as an oil passage, and the passage 111
Through an oil passage 113 formed at the bottom of the cover 7.

Lubricating oil is enclosed in the gear casing 5, and the oil amount is such that the oil level A reaches the tooth bottom surface of the small gear 39 as shown in FIG. 1, for example.

Next, the operation of the screw type supercharger according to this embodiment will be described.

When a part of the driving force of the engine (not shown) is transmitted to the pulley 59, the rotational force input from the pulley 59 to the input shaft 51 causes the large gear 53 and the small gear 39 of the speed increasing mechanism.
Is transmitted to the female rotor 9 via the female rotor shaft 13 and is transmitted from the female rotor shaft 13 to the timing gear 37,
It is transmitted in synchronization with the male rotor 11 via 45 and the male rotor shaft 15. And a pair of male and female rotors 9, 11
Rotates while meshing with the rotor casing 3 without making contact with each other and pumps air on the suction side to the discharge side.

On the other hand, the rotation of the input shaft 51 causes the large gear 53, the small gear 39, and the timing gears 37, 4 of the speed increasing mechanism to rotate.
5 rotates, the small gear 39 of the speed increasing mechanism and the female rotor shaft 1
As the timing gear 37 of No. 5 rotates, the lubricating oil in the gear casing 5 is scraped up.

A part of the scraped lubricating oil is in the oil passage 1.
13, passing through the passage 111, flowing into the insertion hole 103, and received by the spiral member 101 as the oil introducing member 97 rotating integrally with the female rotor 9, the spiral member 1
01 is successively introduced into the lubricating oil passage 89 along the spiral groove, and is supplied to the needle bearing 29 portion supporting the female rotor shaft 13 through the lubricating oil passage 89 to lubricate the needle bearing 29 with oil.

The lubricating oil that has lubricated the needle bearing 29 is sent through the passage 93 to the needle bearing 31 that supports the male rotor shaft 15, and the needle bearing 31
Lubricate with oil.

Further, the lubricating oil that lubricates the needle bearing 31 is sent to the gear casing 5 side through the lubricating oil passage 91 of the male rotor 11, and the spiral member as the oil introducing member 99 that rotates integrally with the input shaft 51. It is guided into the gear casing 5 along the spiral groove 105. Even when the male and female rotors 9 and 11 are vertically arranged as shown in FIG. 2 and assembled in a vehicle, the oil introducing member 97 extends from the bottom of the cover 7 to the needle bearing 29, and the oil introducing member 99 extends from the needle bearing 31 to the lubricating oil passage. Achieves effective lubrication oil introduction action until opening.

Thus, the spiral member 101 of the female rotor 9
The lubricating oil is introduced into the lubricating oil passage 89 of the female rotor 9 with the male rotor 1 with the spiral member 105 connected to the input shaft 51.
Since the lubricating oil is derived from the first lubricating oil passage 91, it can be smoothly circulated in the path of the lubricating oil passage 89 → the needle bearing 29 part → the passage 93 → the needle bearing 31 part → the lubricating oil passage 91.

Therefore, both needle bearings 29, 31
The lubricating oil is reliably supplied to both needle bearings 2
It is possible to constantly lubricate 9, 31 with oil.

[0052]

As described above, according to the invention of claim 1, it is possible to supply the lubricating oil from the lubricating oil passage of each rotor to both the needle bearing portions on the suction side of the rotor. Oil lubrication of
The durability of both needle bearings can be improved.

Further, since the lubricating oil can be circulated from the lubricating oil passage of the female rotor to the lubricating oil passage of the male rotor via the passage that connects both needle bearing portions, the lubricating oil can be surely supplied to both needle bearing portions. Can be supplied.

According to the second aspect of the invention, since the passage is provided in the rib connecting the two bearing housings for accommodating the needle bearings, the strength of the two bearing housings can be reinforced.

According to the third aspect of the invention, since the oil introducing member for receiving the lubricating oil scraped up by the rotation of the speed increasing mechanism and the timing gear and guiding it to the lubricating oil passage is provided, the lubricating oil passage is provided. Lubricating oil can be sufficiently introduced.

According to the fourth aspect of the invention, the female rotor side is provided with a spiral member for receiving the lubricating oil scraped up by the rotation of the speed increasing mechanism and the timing gear and introducing it into the lubricating oil passage of the female rotor. A spiral member that guides lubricating oil from the lubricating oil passage of the male rotor is provided on the male rotor side, so that the lubricating oil can be circulated smoothly and reliably from the lubricating oil passage of the female rotor to the lubricating oil passage of the male rotor through the passage. Since both needle bearings are supplied with sufficient lubricating oil, the durability of the needle bearings can be improved.

[Brief description of drawings]

FIG. 1 is a front sectional view of a screw type supercharger according to an embodiment of the present invention.

FIG. 2 is a side view seen from the direction C in FIG.

FIG. 3 is a front sectional view of a screw type fluid machine according to a conventional example.

[Explanation of symbols]

 1 casing 3 rotor casing 5 gear casing 7 cover 9 female rotor 11 male rotor 13 female rotor shaft 15 male rotor shaft 17 bearing portion 19 bearing portion 25 bearing housing 27 bearing housing 29 needle bearing 31 needle bearing 37 timing gear 39 small gear (increase Speed mechanism) 45 timing gear 51 input shaft 53 large gear (speed increasing mechanism) 89 lubricating oil passage 91 lubricating oil passage 93 passage 95 rib 97 oil introducing member 99 oil introducing member 101 spiral member 105 spiral member

Claims (4)

[Claims] 1. A pair of screw-shaped male and female rotors, a casing that houses the rotors and rotatably supports the rotor shafts of the rotors through bearings, and the rotor shafts that are provided on the rotor shafts and mesh with each other. The timing gear and the speed-increasing gear are provided with a matching timing gear and a speed-increasing mechanism that speeds up the rotation input to the input shaft and transmits the speed to the female rotor. In a screw type supercharger in which the mechanism is housed in a gear casing filled with lubricating oil, lubricating oil passages are provided in the shaft cores of both rotors, and one end of each lubricating oil passage is used as a needle bearing portion. A screw type supercharger characterized by being provided with a passage communicating with both needle bearing portions. 2. The screw type supercharger according to claim 1, wherein the passage is provided in a rib that connects between bearing housings housed in both needle bearings. 3. The screw type supercharger according to claim 1 or 2, wherein an oil introducing member for introducing lubricating oil is provided at the other end of each lubricating oil passage. . 4. The screw type turbocharger according to claim 3, wherein the oil introducing member is a spiral member fitted in the other end of the lubricating oil passage of the female rotor and fixed in the rotation direction.
A screw type supercharger, comprising a spiral member connected to the input shaft and having one end inserted into the other end of the lubricating oil passage of the male rotor so as to be relatively rotatable.