JPH04103231U - Centrifugal super charger - Google Patents

Abstract

(57) [Summary] [Purpose] In a system with multiple sets of compressors,
The purpose of the present invention is to provide a centrifugal supercharger that has a compact structure and can be adapted to pressurize large volumes. [Structure] The compressor housing is connected to the main housing via the center housing, and the wheel shaft is equipped with a planetary gear for speed increase and is supported by the center housing and inserted into the compressor housing. Two single-suction centrifugal compressor wheels of two sets of compressors are fixed to the shaft with the suction sides facing each other, and the suction side of the volute chamber provided around the entire circumference of each compressor wheel is connected to one suction port. , each of the discharge sides is configured to communicate with one discharge port.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is installed in vehicle engines and is directly driven by the engine for supercharging. The present invention relates to a centrifugal supercharger that operates.

0002

[Conventional technology]

In recent years, engine-based superchargers have replaced exhaust turbo types as vehicle engine superchargers. Direct-drive superchargers are increasingly being used. This super cha The turbocharger can be reliably driven and supercharged by engine rotation even at low speeds. , there are advantages such as less turbo lag during transition. Here, make sure that there is enough excess power in the low speed range. Generally speaking, a positive displacement type such as a Roots blower is used to In the case of be. For this reason, an electromagnetic clutch is installed on the input side of the supercharger to accelerate and increase speed. Controls the drive to supercharge only when the load is on, and prevents intake system supercharging. This requires measures such as providing a bypass path, which complicates the structure and control.

0003 Therefore, it has been proposed to adopt a centrifugal type as this mechanically driven type. but, In the case of this centrifugal type, the supercharging efficiency is lower than that of the positive displacement type, so the rotation speed is increased and input. It is also necessary to take measures to increase supercharging efficiency in the low speed range.

0004 An example of a conventional centrifugal supercharger is the one shown in Figure 3 ( West Germany, see Patent Application No. 3829697). That is, the compressor A planetary gear is provided on the input side of the drive shaft of the wheel, with the pinion side fixed. Then, connect the input shaft to the ring gear of the planetary gear, and connect the input shaft to the ring gear of the planetary gear. A gear is formed on the wheel drive shaft, and the speed of the wheel is increased by the speed increasing ratio of this planetary gear. It is designed to rotate.

[0005]

[Problem that the idea aims to solve] However, in the conventional supercharger mentioned above, one set of planetary Since the configuration uses gears to increase speed, there is a limit to the speed increasing ratio as well as the number of teeth on the sun gear. be. Therefore, there is a limit to the supercharging efficiency, and to increase this efficiency, the wheel It is necessary to increase the size, which leads to an increase in size as a whole. Here, the compressor It is conceivable to provide multiple sets of However, the amount of intake air is small, making it unsuitable for use in vehicles. Also, the axial space is longer. However, there are problems such as the shape of the air flow path becomes complicated, and this point needs to be taken into consideration. Ru.

[0006] Therefore, this idea was developed in a system that has multiple sets of compressors. Providing a centrifugal supercharger that can accommodate large capacity pressurization. With the goal.

[0007]

[Means to solve the problem]

In order to solve the above problem, this idea has a center housing in the main housing. Equipped with a compressor housing that is connected via a , a wheel shaft that is supported by the center housing and inserted into the compressor housing. and two sets of compressors are mounted on the wheel shaft in the compressor housing. Two single-suction centrifugal compressor wheels are fixed with the suction sides facing each other, The suction side of the vortex chamber provided around the entire circumference of each compressor wheel is connected to one suction port. It is characterized in that each discharge side is configured to communicate with one discharge port.

[0008]

[Effect]

According to the above configuration, the engine power is increased in speed by the planetary gear and transmitted to the wheel shaft. reach and drive two sets of compressors simultaneously. At this time, the suction and discharge ports are Two sets of compressors discharge a large amount of air under high pressure to provide sufficient supercharging. . Therefore, this increase in compressor capacity improves supercharging efficiency, making it easier to assemble on the wheel side. The structure allows the overall structure to be made smaller.

[0009]

【Example】

Examples of this invention will be described below.

0010 FIG. 1 is a sectional view of an embodiment of this invention, and FIG. 2 is a front view of the same. A centrifugal supercharger 10 is transmitted to the crankshaft 2 of the engine via a belt transmission means 3. dynamically configured. The belt transmission means 3 connects the pulley 4 of the crankshaft 2 and the super chain. A belt 6 is wound between the pulley 5 of the charger 10, and the pulley 5 is attached to a pulley shaft 5. A movable pulley 5c is movably provided on a fixed pulley 5b that is integrated with the It is now possible to

[0011] The supercharger 10 is disposed adjacent to one side of the pulley 5 substantially coaxially. It has a cylindrical main housing 11, and the main housing 11 has a cylindrical main housing 11. A center housing 12 and a compressor housing 13 are located on the opposite side from the compressor housing 5. The plate 14 and the bolt 15 are tightened and connected together. Also, the compressor A side cover 16 is fastened to the side surface of the housing with bolts 15.

0012 The compressor housing 13 includes two sets of compressors 20 having substantially equal pressurizing capacity, 20'. One compressor housing 20 is A wheel chamber 21 is located at the center of the housing 13 and the center housing 12. Swirl chambers are formed in communication with each other around the periphery of the vortex chambers. The other compressor 20' is Similarly, in the compressor housing 13 and side cover 16, there is a wheel in the center. A wheel chamber 21' is formed by a spiral chamber 22' communicating with each other around the wheel chamber 21'. be done. Then, on the central axis between both wheel chambers 21, 21', as shown in FIG. One common suction port 23 is provided, and this suction port 23 is connected to each It communicates with the wheel chambers 21, 21'. In addition, the suction of the compressor housing 13 On the opposite side of the port 23, one common outlet is provided between each swirl chamber 22, 22'. The flow path is configured such that the terminal ends of the swirl chambers 22, 22' communicate with this discharge port. 2 Single suction type compressor wheels 26, 26 are provided in the two wheel chambers 21, 21'. ' are housed with their suction sides facing each other, and these compressor wheels 2 6, 26' are fixed to one end of the wheel shaft 27. Here, the suction port 23 has two sets. It has a diameter that can supply sufficient air to the compressors 20, 20', and The port can collect and discharge pressurized air from two sets of compressors 20 and 20'. It is formed to have a possible diameter. Thus, together with the wheel axle 27, the 2 One compressor wheel 26, 26' rotates, two sets of compressors 20, 2 0' is driven at the same time for centrifugal supercharging.

[0013] The wheel shaft 27 of the compressor wheels 26, 26' is connected to the center housing 1. It is rotatably supported by a bearing 17 of No. 2, and a lubricating passage 1 is provided around this bearing 17. 8, an oil seal 19, etc. are provided.

[0014] Moreover, a set of planetary gears 30 for speed increase is provided inside the main housing 11. It is accommodated. The planetary gear 30 is a small diameter sun formed on the wheel shaft 27. A large diameter ring gear 33 meshes with the gear 31 via a relatively large diameter pinion 32. That's what it looks like. A pinion shaft 34 is fixed to the center housing 12. 32 is rotatably supported via a bearing 35, and this gear configuration allows a predetermined large A speed increasing ratio e is obtained.

[0015] The pulley shaft 5a of the supercharger side pulley 5 is formed to have a relatively large diameter. A recess 5d is formed in the pulley shaft 5a, and the main housing 11 is inserted into the recess 5d. The boss portion 11a is inserted and assembled. The above planetary gear is attached to the pulley shaft 5a. An input shaft 36 on which 30 ring gears 33 are formed is fixed, and this input shaft 3 6 is rotatably supported by a bearing 37 with respect to the main housing boss portion 11a. Ru.

[0016] Next, the operation of this embodiment will be explained.

[0017] First, when the engine is running, the power is transferred to the supercharger via the belt transmission means 3. The transmission is transmitted to the pulley 5 on the gear 10 side, and further to the planetary gear 30 via the input shaft 36. The input signal is input to the ring gear 33 of. Therefore, by using this planetary gear 30, the engine The power increases in speed and is output from the sun gear 31 to the wheel shaft 27, and this Therefore, the compressor housing 13 has two sets of compressors 20 and 20'. The roller wheels 26, 26' rotate at a relatively high speed even in a low speed range.

[0018] Then, in the two sets of compressors 20, 20', the compressor wheels 26, 2 6' rotates the wheels from one suction port 23 through the suction channel 24. Sufficient air is taken in as the wheel rotates, and all of this air is absorbed by the wheels 26, 26'. The pressure increases and flows out in the radial direction, and it becomes a high-speed swirling flow in the swirl chambers 22 and 22'. At the same time, pressure is applied so that the gases are collectively discharged. And two spiral chambers 22, 22' The pressurized air is further collected at one discharge port, and is then discharged under high pressure. child As a result, a large amount of air is discharged at high pressure with twice the compressor capacity, and sufficient turbocharging is achieved. will be used. At this time, there are variations in the pressurizing characteristics of the two sets of compressors. If so, it will be averaged.

[0019] Note that this invention is not limited to the above embodiments. For example, two sets of The compressor may have different pressurizing characteristics. The end of the wheel axle is covered with a side cover. It can also be configured to be supported by bearings and supported on both sides.

[0020]

[Effect of the idea]

As is clear from the above, according to this invention, the centrifugal supercharger In this case, two sets of compressors are installed to produce twice the compressor capacity. Because of this, it is possible to pressurize a large amount of air, making it suitable for use in vehicles. This improves the turbocharging efficiency of the cooler. Two sets of compressors are assembled opposite each other, and one Since the inlet and outlet of the compressor are connected to each other, the compressor becomes more compact. , suitable for installation in the intake system.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of one embodiment of this invention.

FIG. 2 is a front view of the same.

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

[Explanation of symbols]

5 Pulley 10 Supercharger 11 Main housing 12 Center housing 13 Compressor Having 20,20' Compressor 22, 22' vortex chamber 23 Inlet 26,26' Compressor wheel 27 Wheel axis 30 Planetary gear

Claims (1)

[Scope of utility model registration request] 1. A compressor housing comprising: a compressor housing joined to a main housing via a center housing; and a wheel shaft having a planetary gear for increasing speed, supported by the center housing and inserted into the compressor housing. At the wheel axis, 2
Two single-suction centrifugal compressor wheels of a set of compressors are fixed with the suction sides facing each other, and the suction side of the volute chamber provided around the entire circumference of each compressor wheel is connected to one suction port, and the discharge side is connected to one suction port. A centrifugal supercharger characterized in that each discharge port communicates with the other.