CN203730078U - Turbocharger - Google Patents

Abstract

The utility model provides a turbocharger. A ball bearing unit is provided with an outer ring, a first inner ring, a second inner ring, first balls, second balls, a first retainer and a second retainer. The outer ring is composed of a single cylinder, and a first raceway surface on the turbine side and a second raceway surface on the impeller side are arranged beside the two ends of the outer ring. The first inner ring is provided with a third raceway surface opposite to the first raceway surface. The second inner ring is provided with a fourth raceway surface opposite to the second raceway surface. The first balls can roll between the first raceway surface and the third raceway surface. The second balls can roll between the second raceway surface and the fourth raceway surface. The first retainer is used for making the first balls retained at equal intervals in the circumferential direction. The second retainer is used for making the second balls retained at equal intervals in the circumferential direction. A small gap is formed between a body shell and the outer ring of the ball bearing unit and positioned by a positioning pin. An oil film damper which makes a bearing shell move in the axial direction of the positioning pin is formed, so that vibration of a rotating shaft can be absorbed in the high-speed rotating process; in addition, the ball bearing unit can be easily positioned and fixed compared with the body shell.

Description

Turbosupercharger

Technical field

The utility model relates to the turbosupercharger with ball bearing unit, and this ball bearing unit is for supporting the running shaft that is provided with impeller and turbine at two end part freely with respect to shell rotation.

Background technique

In order to increase the output of motor in the situation that not changing air displacement, be widely used the turbosupercharger that the energy by exhaust compresses the air that will send into motor.

As an example of this turbosupercharger, Fig. 2～3 have represented the turbosupercharger described in patent documentation 1, and Fig. 3 is the sectional view of the ball bearing unit 7 shown in Fig. 2.

But in the formation of this prior art, the assembling of ball bearing unit is difficult, in addition, it is also difficult that ball bearing unit is correctly positioned with respect to main body cover, and, also there is vibrative problem when High Rotation Speed.

Patent documentation 1: TOHKEMY 2008-298284 communique

Model utility content

The utility model is In view of the foregoing made, be used for realizing a kind of turbosupercharger, in this turbosupercharger, the assembling of ball bearing unit is easy, and location when ball bearing unit is assembled on main body cover is easy, and can not produce the vibration of running shaft.

To achieve these goals, turbosupercharger of the present utility model has: main body cover; Exhaust flow path; Air feed stream; The turbine rotating by the Exhaust Gas circulating in described exhaust flow path; At one end fix the running shaft of described turbine; Be fixed on the other end of described running shaft and the impeller that the air of air feed stream is compressed; With the rotation of described running shaft is bearing in to the ball bearing unit in described main body cover freely, this turbosupercharger is characterised in that, described ball bearing unit has: outer ring, and this outer ring consists of single cylinder and near two ends, has the first roller surface of turbo-side and the second roller surface of impeller side; The first inner ring, has three roller surface relative with described the first roller surface; The second inner ring, has four roller surface relative with described the second roller surface; First ball that can roll between described the first roller surface and described the 3rd roller surface; Second ball that can roll between described the second roller surface and described the 4th roller surface; The first retainer that described the first ball is along the circumferential direction equally spaced kept; With the second retainer that described the second ball is along the circumferential direction equally spaced kept.

And, more preferably, in turbosupercharger of the present utility model, on near the outer circumferential face axial two ends of described outer ring, be provided with outboard flanges portion, between this outboard flanges portion and the inner peripheral surface of described main body cover, form micro-gap, on described outer ring and described main body cover, be provided with the pin-and-hole of coaxial and equal diameters, by making locating stud and described pin-and-hole chimeric, and described ball bearing unit is located with respect to described main body cover, and, with respect to described main body cover, suppress the rotation of described ball bearing unit, and, make the described outer ring can be with respect to described main body cover and moving axially along described locating stud, the lubricant oil that described micro-gap is supplied with, form the film damper of the vibration that suppresses described ball bearing unit.

Accompanying drawing explanation

Fig. 1 means the sectional view of the ball bearing unit of mode of execution one example of the present utility model.

Fig. 2 means the sectional view of a turbosupercharger example, that have ball bearing unit of existing structure.

Fig. 3 is the sectional view of the ball bearing unit 7 of Fig. 2.

Embodiment

Fig. 1 means the sectional view of mode of execution of the present utility model turbosupercharger one example, that have ball bearing unit.

This turbosupercharger has: main body cover 160; Exhaust flow path 1; Air feed stream 5; The turbine 3 rotating by the Exhaust Gas circulating in exhaust flow path 1; The running shaft 102 of fixed turbine 3 at one end; Be fixed on the other end of running shaft 102 and the impeller 4 that the air of air feed stream 5 is compressed; With running shaft 102 rotation is bearing in to the ball bearing unit 107 in main body cover 160 freely.

This ball bearing unit 107 is configured to be had: outer ring 110, and this outer ring 110 consists of single cylinder and near two ends, has the first roller surface 37 of turbine 3 sides and the second roller surface 38 of impeller 4 sides; The first inner ring 121, has three roller surface 40 relative with above-mentioned the first roller surface 37; The second inner ring 120, has four roller surface 44 relative with above-mentioned the second roller surface 38; A plurality of rolling elements freely, i.e. the first ball 130 can roll between above-mentioned the first roller surface 37 and above-mentioned the 3rd roller surface 40; A plurality of rolling elements freely, i.e. the second ball 131 can roll between above-mentioned the second roller surface 38 and above-mentioned the 4th roller surface 44; The first retainer 140 that the first ball 130 is along the circumferential direction equally spaced kept; With the second retainer 141 that the second ball 131 is along the circumferential direction equally spaced kept.

The first inner ring 121 and the second inner ring 120 make axial inner side end butt separately, and thus, the distance between the second roller surface 38 and the 3rd roller surface 40 becomes specified value.

In addition, in the situation that only the first inner ring 121 under high temperature is used to high heat-resistant material etc., the axial dimension of the first inner ring 121 is set shortlyer than the axial dimension of the second inner ring 120, thus, the use amount that can make expensive material is irreducible minimum.On the other hand, by making axial dimension identical, also can seek the generalization of parts, therefore, the setting of the axial dimension of inner ring 120,121, is suitably set as according to service condition etc.

Because outer ring 36 is integrated structure, so, easily to shell assembling, and can assemble accurately.In addition, owing to there is no packing ring between the inner ring of existing structure, so, can the running accuracy after assembling be maintained highlyer.

On near the outer circumferential face axial two ends of above-mentioned outer ring 110, be provided with the 111a of outboard flanges portion, 111b, the 111a of this outboard flanges portion, 111b form micro-gap between the inner peripheral surface of itself and main body cover 160.In the axial inner side of the 111a of outboard flanges portion, 111b, be provided with lubricant oil feed trough 112a, 112b, in lubricant oil feed trough 112a, 112b, towards above-mentioned rolling element 130,130 sides be provided with respect to the radial skew of above-mentioned outer ring 110 at least one, be preferably a plurality of lubricant oil supply hole 113a, 113b.

In the axial inner side of lubricant oil feed trough 112a, 112b, be provided with the 114a of medial flange portion, 114b that external diameter is identical with the 111a of outboard flanges portion, 111b.

The further axial inner side of the 114a of medial flange portion, 114b, becomes the oil-discharge trough 115 that external diameter is less than the 114a of medial flange portion, 114b.In oil-discharge trough 115, radially penetratingly offer lubricant oil from the inner oil drainage hole 116 of discharging of bearing.The roughness of the outer circumferential face of this oil-discharge trough 115 is processed and is realized by roughening, but, in order to reduce the resistance of discharge, the axial length of oil-discharge trough 115 is set longly for well, and in addition, it is circle that oil drainage hole 116 does not need to make cross section, in addition, the perforate significantly of also can trying one's best.

On main body cover 160 and outer ring 110, be provided with the pin-and-hole 161,117 of coaxial and equal diameters, make locating stud 170 and pin-and-hole 161,117 chimeric, and ball bearing unit 107 is located rightly with respect to main body cover 160.

Pin-and-hole 161,117 has stricter tolerance ground, by holing, form in place and go up, and so that bearing case can be with respect to main body cover 160 the axially movable mode along locating stud 170, make locating stud 170 chimeric with respect to main body cover 160 from grease conduits assembly department 162.By locating stud 170, can make ball bearing unit 107 and then running shaft 102 is correctly located in main body cover 160.By locating stud 170, also can suppress outer ring 110 with respect to the rotation of main body cover 160.

On the grease conduits assembly department 162 of main body cover 160, by known method, not shown grease conduits is set, lubricant oil from the first lubricant oil way 163, the second lubricant oil way 164 by being directed into the 111a of outboard flanges portion, 111b or the 114a of medial flange portion, 114b or its both sides.In Fig. 1, represented to be directed into the example of the 114a of medial flange portion, 114b.

What can make that bearing case can be along locating stud 170 with respect to main body cover 160 is axially movably fixing, therefore, the lubricant oil of supplying with to the micro-gap between the inner peripheral surface of main body cover 160 and the 111a of outboard flanges portion, 111b, the 114a of medial flange portion, 114b, as suppress ball bearing unit 107 vibration film damper and play a role.

As mentioned above, according to the utility model, ball bearing unit consists of an outer ring and two inner rings that consist of single cylinder, thus, and easily assembling, and because do not need packing ring, so, there is higher running accuracy.

In addition, between main body cover and the outer ring of ball bearing unit, be provided with micro-gap, and position by locating stud, thus, formation can make ball bearing unit along the axially movable film damper of locating stud, when High Rotation Speed, also can absorb the vibration of running shaft, in addition, owing to positioning by locating stud, so can easily carry out the location of ball bearing unit and fix with respect to main body cover, therefore, can preferably as the turbosupercharger of the pressurized machine as motor, use.

Claims (1)

1. a turbosupercharger, it has:

Main body cover;

Exhaust flow path;

Air feed stream;

The turbine rotating by the Exhaust Gas circulating in described exhaust flow path;

At one end fix the running shaft of described turbine;

Be fixed on the other end of described running shaft and the impeller that the air of air feed stream is compressed; With

The rotation of described running shaft is bearing in to the ball bearing unit in described main body cover freely, and this turbosupercharger is characterised in that, described ball bearing unit has:

Outer ring, this outer ring consists of single cylinder and near two ends, has the first roller surface of turbo-side and the second roller surface of impeller side;

The first inner ring, has three roller surface relative with described the first roller surface;

The second inner ring, has four roller surface relative with described the second roller surface;

First ball that can roll between described the first roller surface and described the 3rd roller surface;

Second ball that can roll between described the second roller surface and described the 4th roller surface;

The first retainer that described the first ball is along the circumferential direction equally spaced kept; With

The second retainer that described the second ball is along the circumferential direction equally spaced kept,

On near the outer circumferential face axial two ends of described outer ring, be provided with outboard flanges portion, between this outboard flanges portion and the inner peripheral surface of described main body cover, form micro-gap,

On described outer ring and described main body cover, be provided with the pin-and-hole of coaxial and equal diameters,

By making locating stud and described pin-and-hole chimeric, and described ball bearing unit is located with respect to described main body cover, and, with respect to described main body cover, suppress the rotation of described ball bearing unit, and, make the described outer ring can be with respect to described main body cover and moving axially along described locating stud

The lubricant oil that described micro-gap is supplied with forms the film damper of the vibration that suppresses described ball bearing unit.