阅读说明：本技术 一种球轴承外置式涡轮增压器 (Turbocharger with external ball bearing ) 是由 闫文斌 裴鹏军 王永红 王志华 熊劲松 于 2020-08-06 设计创作，主要内容包括：本发明公开了一种球轴承外置式涡轮增压器,本涡轮增压器将支承旋转轴旋转的球轴承从中间腔体移到压气腔体内,并通过固定在压气腔体内的支承架体与球轴承配合达到支承旋转轴,既可以缩小涡轮增压器中涡轮机与压气机的轴距,大大提升旋转轴的刚性,使得旋转轴在高速旋转时,旋转轴和轴心轨迹更加稳定,并且本申请支承架体与球轴承、旋转轴配合的结构能够承受一定的轴向力和径向力,不用额外增加止推轴承设计,大大缩减了中间腔体的体积,整体结构更为简便；同时,球轴承外置到压气腔体内,可以避免球轴承传导涡轮腔体内的高温,避免球轴承内机油老化,延长其使用寿命。(The invention discloses a turbocharger with an external ball bearing, which moves a ball bearing for supporting a rotating shaft to rotate from an intermediate cavity into an air compressing cavity, and the ball bearing is matched with a supporting frame body fixed in the air compressing cavity to support the rotating shaft, so that the shaft distance between a turbine and an air compressor in the turbocharger can be reduced, the rigidity of the rotating shaft is greatly improved, the rotating shaft and the axle center track are more stable when the rotating shaft rotates at high speed, and the structure of the supporting frame body matched with the ball bearing and the rotating shaft can bear certain axial force and radial force without additionally increasing the design of a thrust bearing, the volume of the intermediate cavity is greatly reduced, and the overall structure is simpler and more convenient; meanwhile, the ball bearing is externally arranged in the air compression cavity, so that the ball bearing can be prevented from conducting high temperature in the turbine cavity, the engine oil in the ball bearing is prevented from aging, and the service life of the engine oil is prolonged.)

1. The utility model provides an external turbo charger of ball bearing, includes body shell (1), rotation axis (2), turbine (3) and impeller (4), body shell (1) is including communicating turbine cavity (1-1), middle cavity (1-2), puffer chamber body (1-3) in proper order, wherein, air inlet and gas outlet have all been seted up on turbine cavity (1-1), puffer chamber body (1-3), turbine (3) are located in turbine cavity (1-1), impeller (4) are located in puffer chamber body (1-3), and this turbine (3) and impeller (4) all connect and establish coaxial linkage on rotation axis (2), its characterized in that, the removable supporting frame body (5) that has connect in the puffer chamber body (1-3), the one end that rotation axis (2) correspond puffer chamber body (1-3) connects and establishes on supporting frame body (5), and the joint of the rotating shaft (2) and the supporting frame body (5) is rotationally connected through a ball bearing (6).

2. The ball bearing external turbocharger according to claim 1, wherein the support frame body (5) comprises a bearing outer sleeve (5-1) and support legs (5-2) integrally distributed on the outer wall of the bearing outer sleeve (5-1), a connecting palm (5-3) is integrally arranged at one end of each support leg (5-2) far away from the outer wall of the bearing outer sleeve (5-1), connecting threads are arranged on the inner wall of the air compressing cavity (1-3) corresponding to the connecting palm (5-3), and the support frame body (5) is fixed in the air compressing cavity (1-3) through the connecting palm (5-3) and the connecting threads.

3. The ball bearing external turbocharger according to claim 2, wherein the ball bearing (6) comprises an outer collar (6-1), an inner collar (6-2), balls (6-3) and a rolling seat (6-4), wherein a snap ring (6-5) is integrally and convexly arranged on the inner side of one end of the outer collar (6-1), a boss (6-6) is integrally and convexly arranged on the outer side of the same end of the inner collar (6-2), a snap groove (6-7) matched with the snap ring (6-5) is integrally and concavely arranged on the outer wall of the boss (6-6), and the outer collar (6-1) and the inner collar (6-2) are in matched connection with the snap ring (6-5) through the snap groove (6-7) on the boss (6-6); the inner wall of the outer sleeve ring (6-1) and the outer wall of the inner sleeve ring (6-2) are both provided with double rows of pocket ring surfaces (6-8) which are in point contact with the balls (6-3), the rolling seat (6-4) is provided with ball holes for placing the balls (6-3), and the rolling seat (6-4) is arranged between the symmetrical pocket ring surfaces (6-8) of the outer sleeve ring (6-1) and the inner sleeve ring (6-2).

4. The ball bearing external turbocharger according to claim 3, an oil inlet hole (6-9) and an oil outlet hole (6-10) are respectively arranged between two rows of pocket ring surfaces (6-8) of an outer sleeve ring (6-1) of the ball bearing (6), the oil inlet hole (6-9) and the oil outlet hole (6-10) are arranged corresponding to the supporting foot (5-2), an oil passage (5-4) communicated with the bearing outer sleeve (5-1) is arranged in the supporting foot (5-2), the oil-way passage (5-4) is respectively communicated with the oil inlet (6-9) and the oil outlet (6-10), meanwhile, an oil port (5-5) is formed in the connecting palm (5-3) corresponding to the oil passage (5-4), and a valve is arranged on the body shell (1) corresponding to the oil port (5-5).

5. The turbocharger with the external ball bearing as claimed in claim 3 or 4, wherein the annular baffles (1-4) are integrally arranged at positions corresponding to the turbine cavity (1-1) and the compression cavity (1-3) at two ends of the middle cavity (1-2), the rotating shaft (2) extends from the turbine cavity (1-1) and the middle cavity (1-2) to the compression cavity (1-3) to be connected with the impeller (4), and gaps exist between the rotating shaft (2) and the annular baffles (1-4), between the impeller (4) and the compression cavity (1-3), between the impeller (4) and the annular baffles (1-4), between the turbine (3) and the turbine cavity (1-1), and between the turbine (3) and the annular baffles (1-4).

6. A ball bearing external turbocharger according to claim 5, wherein said intermediate cavity (1-2) is a cavity.

7. The turbocharger with the external ball bearing as claimed in claim 5, wherein the annular baffles (1-4) at the two ends of the intermediate cavity (1-2) are respectively embedded with a sealing gasket in the direction towards the turbine cavity (1-1) and the air compressing cavity (1-3), the intermediate cavity (1-2) is internally provided with an inner annular baffle (1-6) around the rotating shaft (2) to form a sealing cavity, and the body housing (1) is respectively provided with a water inlet valve (7) and a water outlet valve (8) corresponding to the intermediate cavity (1-2) to form a closed water cooling water path.

8. A turbocharger with a ball bearing external according to claim 6 or 7, characterized in that the support foot (5-2) on the bearing housing (5-1) is inclined.

9. The ball bearing external turbocharger according to claim 8, wherein a reinforcing rib plate (9) is arranged outside the body shell (1) corresponding to the middle cavity (1-2), a connecting lug (1-5) is arranged outside the turbine cavity (1-1) close to the middle cavity (1-2), and the reinforcing rib plate (9) is fixed on the connecting lug (1-5) through a bolt.

Technical Field

The invention relates to the technical field of turbocharging equipment, in particular to a turbocharger with an external ball bearing.

Background

The turbocharging technology can greatly improve the power of the piston engine, reduce exhaust pollution and improve economic performance, and is one of the main development directions of the internal combustion engine technology.

A known turbocharger is provided with a rotary shaft rotatably supported by a bearing unit disposed between a compressor and a turbine, a turbine provided at both ends of the rotary shaft, and the compressor, and supplies lubricating oil to the bearing unit to form a damping oil film so as to reduce wear caused by undesired contact between components in the turbocharger.

However, when the bearing unit is disposed in the intermediate body between the turbine and the compressor, one end close to the turbine conducts the high temperature of the turbine, so that an additional water cooling system is required to ensure that the oil in the bearing unit is not aged by the high temperature, meanwhile, a thrust bearing is required to balance the axial force generated when the rotating shaft rotates, the bearing unit is required to be sealed at the same time to prevent the oil from leaking to the compressor end and the turbine end, and thus, the shaft system of the whole rotating shaft is longer, the whole volume of the turbocharger is large, and the arrangement is relatively unchanged; moreover, when the rotating shaft rotates at a high speed, the rotating shaft is greatly distorted and noisy, and the rigidity of the rotating shaft is influenced.

Disclosure of Invention

The invention aims to provide a turbocharger with an external ball bearing, which solves the problems of large volume, inconvenient arrangement, overlong rotating shaft system, complex structure, low flexibility and sensitive high-speed noise of the turbocharger in the background art.

In order to achieve the purpose, the invention provides the following technical scheme that the turbocharger with the external ball bearing comprises a body shell, a rotating shaft, a turbine and an impeller, wherein the body shell comprises a turbine cavity, a middle cavity and an air compression cavity which are sequentially communicated, the turbine cavity and the air compression cavity are respectively provided with an air inlet and an air outlet, the turbine is arranged in the turbine cavity, the impeller is arranged in the air compression cavity, the turbine and the impeller are connected on the rotating shaft in a coaxial linkage mode, a supporting frame body can be detachably connected in the air compression cavity, one end, corresponding to the air compression cavity, of the rotating shaft is connected on the supporting frame body, and the connecting position of the rotating shaft and the supporting frame body is in rotating connection through a ball bearing.

Compared with the prior art, the invention has the beneficial effects that: the turbocharger moves the ball bearing for supporting the rotation of the rotating shaft from the middle cavity to the air compressing cavity, and the rotating shaft is supported by the matching of the bearing frame body fixed in the air compressing cavity and the ball bearing, so that the shaft distance between a turbine and an air compressor in the turbocharger can be reduced, the rigidity of the rotating shaft is greatly improved, the rotating shaft and the shaft center track are more stable when the rotating shaft rotates at a high speed, and the structure of the bearing frame body matched with the ball bearing and the rotating shaft can bear certain axial force and radial force, the design of a thrust bearing is not additionally increased, the volume of the middle cavity is greatly reduced, and the whole structure is simpler and more convenient; meanwhile, the ball bearing is externally arranged in the air compression cavity, so that the ball bearing can be prevented from conducting high temperature in the turbine cavity, the engine oil in the ball bearing is prevented from aging, and the service life of the engine oil is prolonged.

Preferably, the supporting frame body comprises a bearing outer sleeve and supporting legs integrally distributed on the outer wall of the bearing outer sleeve, a connecting palm is integrally arranged at one end, far away from the outer wall of the bearing outer sleeve, of each supporting leg, the inner wall of the air compression cavity body is provided with connecting threads corresponding to the connecting palm, and the supporting frame body is fixed in the air compression cavity body through the connecting palms and the connecting threads, so that the supporting force and the stability of the supporting frame body are guaranteed.

Preferably, the ball bearing comprises an outer sleeve ring, an inner sleeve ring, balls and a rolling seat, wherein a clamping ring is integrally and convexly arranged on the inner side of one end of the outer sleeve ring, a boss is integrally and convexly arranged on the outer side of the same end of the inner sleeve ring, a clamping groove matched with the clamping ring is integrally and concavely arranged on the outer wall of the boss, and the outer sleeve ring and the inner sleeve ring are in matched connection with the clamping ring through the clamping groove on the boss; the inner wall of the outer sleeve ring and the outer wall of the inner sleeve ring are both provided with double rows of pocket hole ring surfaces which are in point contact with the balls, the rolling seat is provided with ball holes for placing the balls, and the rolling seat is arranged between the symmetrical pocket hole ring surfaces of the outer sleeve ring and the inner sleeve ring.

Preferably, the outer collar of the ball bearing is provided with an oil inlet and an oil outlet between the two rows of pocket ring surfaces, the oil inlet and the oil outlet are arranged corresponding to the supporting feet, the supporting feet are internally provided with oil passages communicated with the bearing outer sleeve, the oil passages are respectively communicated with the oil inlet and the oil outlet, meanwhile, the connecting palm is provided with an oil port corresponding to the oil passages, the body shell is provided with a valve corresponding to the oil port, and engine oil is circularly injected by opening the oil passages communicated with the bearing outer sleeve on the supporting feet, so that the lubricating effect of the ball bearing can be realized, and the effect of cooling heat energy generated by high-speed rotation of the ball bearing can be realized.

Preferably, middle cavity both ends side corresponds turbine cavity, the homogeneous body of compressor cavity department is equipped with ring baffle, the rotation axis extends to the interior impeller that connects of compressor cavity from turbine cavity, middle cavity, all have the clearance between this rotation axis and the ring baffle, between impeller and the compressor cavity, between impeller and the ring baffle, between turbine and the turbine cavity, between turbine and the ring baffle, avoid impeller, turbine, rotation axis to produce wearing and tearing with body shell internal friction when high-speed rotation, and middle cavity combines the design of ring baffle can effectively reduce turbine end air current and compressor end air current and reveal each other.

Preferably, the middle cavity is a cavity, so that heat conduction of the turbine cavity can be reduced, and meanwhile, the space structure of the middle cavity effectively reduces flow speed and pressure through closure and expansion of the annular baffle and the middle cavity structure even if hot air flow in the turbine cavity exists, so that waste gas leakage is reduced, and engineering application requirements are met.

Preferably, the annular baffles at the two end sides of the middle cavity are provided with sealing gaskets which are embedded in the directions of the turbine cavity and the air compression cavity, the middle cavity is internally provided with an inner annular baffle around a rotating shaft to form a sealing cavity, the body shell corresponds to the middle cavity and is respectively provided with a water inlet valve and a water outlet valve to form a closed water cooling water path, the adjacent turbine cavity can be cooled through the formed water cooling water path, and heat conduction to the air compression cavity is avoided.

Preferably, the supporting feet on the bearing outer sleeve are inclined, and the inclined arrangement can reduce the influence on the air inlet flow in the air compression chamber.

Preferably, the body shell is provided with a reinforcing rib plate outside the middle cavity, a connecting lug is arranged outside the turbine cavity close to the middle cavity, and the reinforcing rib plate is fixed on the connecting lug through a bolt to prevent the middle body from being exploded under pressure.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic cross-sectional view of the embodiment 1 of the present invention;

FIG. 3 is an enlarged view of the structure of the ball bearing of FIG. 2;

fig. 4 is a schematic structural view of a support frame according to embodiment 1 of the present invention;

FIG. 5 is a schematic cross-sectional view of the embodiment 2 of the present invention;

FIG. 6 is an enlarged view of the structure of the ball bearing of FIG. 4;

fig. 7 is a schematic structural view of a support frame according to embodiment 2 of the present invention;

fig. 8 is a schematic cross-sectional view of an intermediate chamber according to embodiment 3 of the present invention.

In the figure: 1. a body housing; 1-1, a turbine cavity; 1-2, an intermediate cavity; 1-3, a gas compression cavity; 1-4, an annular baffle; 1-5, connecting lugs; 1-6, inner ring baffle; 2. a rotating shaft; 3. a turbine; 4. an impeller; 5. a support frame body; 5-1, bearing outer sleeves; 5-2, supporting legs; 5-3, connecting the palm; 5-4, oil-way channels; 5-5, oil port; 6. a ball bearing; 6-1, an outer collar; 6-2, an inner lantern ring; 6-3, rolling balls; 6-4, rolling the seat; 6-5, a snap ring; 6-6, boss; 6-7, a clamping groove; 6-8 parts of a pocket ring surface; 6-9 parts of an oil inlet hole; 6-10, oil outlet holes; 7. a water inlet valve; 8. a water outlet valve; 9. and a reinforcing plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.