CN203702850U - Ball bearing unit for turbocharger - Google Patents

Abstract

The utility model provides a ball bearing unit for a turbocharger. A lubricating oil feeding groove is formed in the peripheric surface close to two ends of an outer ring in the axial direction; in the lubricating oil feeding groove, at least one lubricating oil feeding hole is formed towards a first ball side and a second ball side and is oblique relative to the axial direction of the outer ring; a pin hole for positioning the ball bearing unit is formed in the outer ring; an oil outlet is formed in the center of the outer ring in the axial direction and is larger than the pin hole in area.

Description

Turbosupercharger ball bearing unit

Technical field

The utility model relates to the improvement of ball bearing unit, and this ball bearing unit is for rotating supporting rotating shaft freely with respect to shell, and this running shaft is provided with the impeller and the turbine that form the turbosupercharger using as the pressurized machine of motor at two end part.

Background technique

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

As an example of this turbosupercharger, Fig. 3 has represented the turbosupercharger described in patent documentation 1.

But, in this prior art, become the structure that the mode two single-row angular contact ball bearings 9,9 are applied to precompression by compression helical spring 15 is used, thus, spacer 16,17 need to be arranged to guarantee vertically the apron space of bearing, thereby existence cannot make the feed path of the lubricant oil of lubricated single-row angular contact ball bearing 9 be located at the unfavorable condition on ideal position.In addition, the oil drainage hole being arranged on bearing case 8 is subject to the restriction from intensity and the size of packing ring, obtains fully large unfavorable condition and have the area of oil drainage hole 18 to be opened.

Patent documentation 1: TOHKEMY 2005-003187 communique

Model utility content

The utility model is In view of the foregoing made, and a kind ofly lubricant oil supply hole can be arranged on to desirable fuel feeding position and the oil drainage hole of removal of lubricant can be opened and obtain larger turbosupercharger ball bearing unit for realizing.

To achieve these goals, turbosupercharger ball bearing unit of the present utility model, the running shaft that is fixed with the turbosupercharger of turbine and impeller in two end part supporting is rotated to the inner side that is bearing in freely shell, it is characterized in that, have: outer ring, this outer ring is made up 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; The second retainer with described the second ball is along the circumferential direction equally spaced kept, near the outer circumferential face axial two ends of described outer ring, is provided with lubricant oil feed trough,

In described lubricant oil feed trough, be provided with at least one the lubricant oil supply hole with respect to the radial skew of described outer ring towards described the first ball side and described the second ball side,

On described outer ring, be provided with the pin-and-hole for ball bearing unit is located,

Be provided with the large oil drainage hole of area of Area Ratio pin-and-hole at the axial middle body of outer ring.

Accompanying drawing explanation

Fig. 1 is the partial sectional view that represents the turbosupercharger with ball bearing unit of mode of execution one example of the present utility model.

Fig. 2 is the sectional view of the ball bearing unit of Fig. 1.

Fig. 3 is the sectional view that represents a turbosupercharger example, that have ball bearing unit of existing structure.

Embodiment

Fig. 1 is illustrated in the state that is assembled with the ball bearing unit 20 of mode of execution one example of the present utility model in the turbosupercharger same with Fig. 3.Although have not shown structure, except ball bearing unit 20 and main body cover 21, exhaust flow path 1, running shaft 2, turbine 3, impeller 4 and air feed stream 5 are the structure same with Fig. 3.

The ball bearing unit 20 of mode of execution of the present utility model is configured to be had: outer ring 45, and this outer ring 45 is made up of single cylinder and near two ends, has the first roller surface 40 of turbine 3 sides and the second roller surface 50 of impeller 4 sides; The first inner ring 42, has three roller surface 41 relative with above-mentioned the first roller surface 40; The second inner ring 52, has four roller surface 51 relative with above-mentioned the second roller surface 50; Multiple rolling elements that can roll between above-mentioned the first roller surface 40 and above-mentioned the 3rd roller surface 42, i.e. the first ball 43; Multiple rolling elements that can roll between above-mentioned the second roller surface 50 and above-mentioned the 4th roller surface 51, i.e. the second ball 53; The first retainer 44 that above-mentioned the first ball 43 is along the circumferential direction equally spaced kept; With the second retainer 54 that above-mentioned the second ball 53 is along the circumferential direction equally spaced kept.

Ball bearing unit 20 is configured to, and to make single-row angular contact ball bearing be back side combination and outer ring is wholely set, and does not apply precompression and has positive gap.Due to for not applying the structure of precompression, so, do not need as described in the technology of patent documentation 1, spacer is arranged to guarantee vertically to the apron space of bearing.

On near the outer circumferential face axial two ends of above-mentioned outer ring 45, be provided with outboard flanges portion 46,56, between this outboard flanges portion 46,56 and the inner peripheral surface of main body cover 21, form micro-gap.Be provided with lubricant oil feed trough 47,57 in the axial inner side of outboard flanges portion 46,56, in lubricant oil feed trough 47,57, towards first, second ball 45,53 sides be provided with respect to the radial skew of above-mentioned outer ring 45 at least one, be preferably multiple lubricant oil supply holes 48,58.

In the axial inner side of lubricant oil feed trough 47,57, be provided with the medial flange portion 49,59 that external diameter is identical with outboard flanges portion 46,56.The further axial inner side of medial flange portion 49,59, becomes the oil-discharge trough 61 that external diameter is less than medial flange portion 49,59, radially penetratingly offers lubricant oil from the inner oil drainage hole 34 of discharging of bearing in oil-discharge trough 61.In order to reduce the discharge resistance of lubricant oil, be preferably, in the allowed band of intensity, open as wide as possible and get oil drainage hole 34, be preferably, open obtain larger than pin-and-hole 33 described later.And the shape of oil drainage hole 34 does not need for circle, can be also the round and smooth quadrilateral in ellipse, bight etc., can be also the long-round-shape that two circular arcs are connected with two straight lines.In Fig. 1～2, the axial length of oil drainage hole 34 is the more than 1/3 of axial length of outer ring 45.

On main body cover 21 and outer ring 45, be provided with the pin-and-hole 22,33 of coaxial and equal diameters, locating stud 70 is contained in pin-and-hole 22,33, thereby makes ball bearing unit 20 with respect to main body cover 21, can floating ground location by film damper described later.

Lubricant oil from the first lubricant oil way 24, the second lubricant oil way 25 by being directed into outboard flanges portion 46,56 or medial flange portion 49,59 or its both sides.In Fig. 1, represent to be directed into the example of medial flange portion 49,59.

As mentioned above, according to the utility model, make the outer ring of bearing be integrated structure, oil drainage hole is located on the axial middle body of outer ring, and, the area of oil drainage hole is established greatlyr than the area of pin-and-hole, thus, expand the outflow opening of lubricant oil, can be easy to discharge the lubricant oil of supplying with.

In addition, be provided with oil-discharge trough in the oil drainage hole portion of outer ring outer circumferential face, can be by the poor scope of cutting of grinding that reduces outer circumferential face of the footpath that produces based on this groove layer upwards, and, in the time assembling bearing, make to become easy to the installation of shell.

Therefore, can be preferably as using for the ball bearing unit that supports freely following running shaft with respect to shell rotation, this running shaft is provided with the impeller and the turbine that form the turbosupercharger using as the pressurized machine of motor at two end part.

Claims (1)

1. a turbosupercharger ball bearing unit, rotates by the running shaft that is fixed with the turbosupercharger of turbine and impeller in two end part supporting the inner side that is bearing in freely shell, it is characterized in that having:

Outer ring, this outer ring is made up 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 lubricant oil feed trough,

In described lubricant oil feed trough, be provided with at least one the lubricant oil supply hole with respect to the radial skew of described outer ring towards described the first ball side and described the second ball side,

On described outer ring, be provided with the pin-and-hole for ball bearing unit is located,

Be provided with the large oil drainage hole of area of Area Ratio pin-and-hole at the axial middle body of outer ring.