CN201054524Y

CN201054524Y - Rear bearing installation structure for car AC electromotor

Info

Publication number: CN201054524Y
Application number: CNU2007200388046U
Authority: CN
Inventors: 王金龙; 冯澍; 李雪宁
Original assignee: ANHUI NINGGUO JINXIN MOTOR Co Ltd
Current assignee: ANHUI NINGGUO JINXIN MOTOR Co Ltd
Priority date: 2007-06-22
Filing date: 2007-06-22
Publication date: 2008-04-30
Anticipated expiration: 2017-06-22

Abstract

The utility model discloses a medium shaft bearing installation structure of an automobile AC dynamo, and includes a dynamo shell, a dynamo medium shaft bearing and a back end cover covering the bearing. The utility model is characterized in that the bearing is coated with a lining, the rear of the lining has an inward rim to block the rim of the bearing and the front of lining has an outward rim which is connected with the back end cover into a whole, and then fixedly arranged on the shell of the dynamo. A plastic lining is arranged between the back end cover of the dynamo and the external circle of the bearing, and a rim is arranged at the two ends of the circle and then inserted on the back end cover and the bearing, so that a rolling path center of the inner circle of the bearing can be dynamically adjusted, thereby improving the working condition of the bearing.

Description

The rear bearing mounting structure of AC generator for vehicle

Technical field

The utility model belongs to a kind of alternating current generator, specifically is a kind of rear bearing mounting structure of AC generator for vehicle.

Background technology

The rear bearing of automobile current generator is walked the outer ring phenomenon, is the technical barrier of a puzzlement manufacturer all the time.Because the AC generator for vehicle working speed is higher, at 4000-15000 rev/min, and behind the generator working stability, organism temperature is at 100-110 ℃.And the inner ring of bearing and motor shaft, outer ring and electric motor end cap, because of the material difference, the coefficient of expansion when variations in temperature is also different, can cause bearing outer ring and electric motor end cap matching loose like this, causes departing from of inner ring and outer ring raceway center, produces the outer ring phenomenon.

The utility model content

The purpose of this utility model provides a kind of rear bearing mounting structure of AC generator for vehicle, installs a plastic bushing additional in rear bearing outer ring and end cap, has solved bearing and has walked the outer ring problem.

The technical solution of the utility model is as follows:

The bottom bracket bearing mounting structure of AC generator for vehicle, include generator casing, the generator axis, be enclosed within the bearing on the axis, cover on the outer rear end cap of bearing, it is characterized in that bearing outside has a lining, there is the inside edge lining rear end, block the bearing edge, the lining front end has outer edge, and rear end cap and lining outer edge connect as one and be fixedly mounted on the generator casing.

The coefficient of expansion of electric motor end cap and bearing steel is respectively 23.7 μ m/m.K, 11.8 μ m/m.K, and when ambient temperature was identical, bearing outer ring cooperated generation loosening with electric motor end cap, and mating surface produces creep because of slide relative, thus the wearing and tearing mating surface.For improving the condition of work of bearing, between the rear end cap and bearing outer ring of generator, install the plastic bushing of a special material additional; The coefficient of expansion of plastics is 2.5 μ m/m.K, because of the coefficient difference big, the value of interference fit of plastic bushing and bearing outer ring can strengthen, and the interference fit of plastic bushing and bearing can produce the gap, but lining and the end cap step by lining is riveted together, can not produce slide relative, thereby avoided the influence of the coefficient of expansion, the raceway center of bearing inner race can dynamically be adjusted automatically, improve the condition of work of bearing, solved bearing and walked the outer ring problem.Simultaneously, because the step of lining endoporus has been avoided the lining possibility of play axially.

Description of drawings

Accompanying drawing is the utility model structural representation.

Embodiment

Referring to accompanying drawing.The rear bearing mounting structure of AC generator for vehicle, include commutator end bearing support bracket 1, generator axis 2, rear bearing 3, plastic bushing 4, the outer edge 5 of plastic bushing 4 is pushed down by rear end cap 1, also can adopt riveted joint, rear end cap 1 is fixed on the generator casing, and there is inside edge 6 plastic bushing 4 rear ends, and retaining is outside rear bearing 3 edges.

Claims

1. the bottom bracket bearing mounting structure of AC generator for vehicle, include generator casing, the generator axis, be enclosed within the bearing on the axis, cover on the outer rear end cap of bearing, it is characterized in that bearing outside has a lining, there is the inside edge lining rear end, block the bearing edge, the lining front end has outer edge, and rear end cap and lining outer edge connect as one and be fixedly mounted on the generator casing.