CN101644320B

CN101644320B - Unidirectional pulley

Info

Publication number: CN101644320B
Application number: CN2009100340106A
Authority: CN
Inventors: 黄伟平
Original assignee: WUXI SUPERHUMAN GEAR COLD EXTRUSION CO Ltd
Current assignee: WUXI SUPERHUMAN GEAR COLD EXTRUSION CO Ltd
Priority date: 2009-08-17
Filing date: 2009-08-17
Publication date: 2011-09-07
Anticipated expiration: 2029-08-17
Also published as: CN101644320A

Abstract

The invention relates to a unidirectional pulley. An inner ring body is sleeved outside a mandrel connecting sleeve, a pulley is sleeved outside the inner ring body, the left end and the right end of the mandrel connecting sleeve are sleeved with bearings, the inner surfaces of inner rings of the bearings are in contact with the outer surface of the mandrel connecting sleeve, the outer surfaces of outer rings of the bearings are in contact with the inner-hole wall surface of the pulley, the inner ring body sleeve is sleeved outside the mandrel connecting sleeve arranged between the opposite end surfaces of the two bearings, the outer surface of the mandrel connecting sleeve arranged between the opposite end surfaces of the two bearings is provided with a curved surface die cavity, a roller pin is arranged in the curved surface die cavity, the cross section of the curved surface die cavity is in a wedge shape, the small end of the curved surface die cavity is consistent with a rotating direction of an electric generator in a working process, the large end of the curved surface die cavity is provided with a restoring spring, the restoring spring is supported to the roller pin and pushes the roller pin to the small end of the curved surface die cavity, and a sealing device is sleeved on the mandrel connecting sleeve. The unidirectional pulley eliminates the phenomenon that the pulley skids when running at high speed and solves the conflict between spring thrust and frictional resistance.

Description

One-way belt sheave

Technical field

The one-way belt sheave that the present invention relates to a kind ofly to be mainly used on the automobile current generator, the unidirectional delivery power reverse is skidded.

Background technique

At present, the application of one-way belt sheave has been arranged abroad, this belt pulley machining accuracy height, structure is complicated, makes difficulty.The domestic design that this respect is also arranged, but working life is short, generally all less than 10000 hours, and the generator life test requires quite harshness, changes to protect dropping to 0 again in special 15 seconds from 0-19000, stops being in 5 seconds one-period, 40000 test of many times are carried out in requirement, the present product of domestic all enterprises and many overseas enterprises can't pass the life of generator test at all, carries out 10000 test of many times at most and has just lost efficacy, so can not enter OEM main engine factory.

Summary of the invention

The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of needle roller under action of centrifugal force, can enter engagement automatically, make transmission of torque more reliable, in the phenomenon that runs up and exempted to skid down and rubbed, reduced the belt pulley generation of heat in use, the raising one-way belt sheave of energy Acceptable life.

According to technological scheme provided by the invention, described one-way belt sheave comprises belt pulley, inner ring body and mandrel connecting sleeve, inner ring body is enclosed within mandrel connecting sleeve outside, belt pulley is enclosed within the inner ring body outside, on a mandrel connecting sleeve left side, right two end part are with bearing, the inner ring internal surface of described bearing contacts with mandrel connecting sleeve outer surface, the outer ring outer surface of bearing contacts with belt pulley endoporus wall, inner ring body is enclosed within the mandrel connecting sleeve outside between the two bearings opposing end surface, mandrel connecting sleeve outer surface between the two bearings opposing end surface offers curve-surface cavity, be provided with needle roller in the curve-surface cavity, described curve-surface cavity section is a wedge shape, sense of rotation when the small end of curve-surface cavity is worked with generator is consistent, the big end of curve-surface cavity is provided with Returnning spring, described Returnning spring is against on the needle roller and pushes needle roller the small end of curve-surface cavity to, also is with seal arrangement on the mandrel connecting sleeve.

Mandrel connecting sleeve outer surface between the two bearings opposing end surface has annular protrusion, and described curve-surface cavity is opened on this annular protrusion.On the mandrel connecting sleeve of annular protrusion both sides, all be with capping, the opposing end surface of two cappings contacts with the left and right both ends of the surface of annular protrusion, the outer surface of capping contacts with the inner ring body internal surface, outer surface in capping offers circumferential groove, groove is embedded with seal ring, constitutes described seal arrangement by capping and seal ring.

This belt pulley has the function of unidirectional delivery moment, and its internal structure is equivalent to an overrunning clutch.But because of the rotating speed of generator requires high, maximum speed reaches 19000 during life test changes, when adopting conventional overrunning clutch structure, when running up, roller is under action of centrifugal force, there is the thrust that overcomes spring to withdraw from the ability of engagement automatically, belt pulley is skidded, can not play the function of unidirectional delivery power.If the increasing spring thrust, the then corresponding increase of surface friction drag makes belt pulley produce high temperature when oppositely skidding, and causes belt pulley early failue.

Needle roller among the present invention can enter engagement automatically under action of centrifugal force, make transmission of torque more reliable, in the phenomenon that runs up and exempted to skid down and rubbed, reduced the belt pulley generation of heat in use, can effectively improve the working life of one-way belt sheave, and overcome the phenomenon that belt pulley skids when running up, also solved the contradiction of spring thrust and surface friction drag.

Description of drawings

Fig. 1 is an overall structure schematic representation of the present invention.

Fig. 2 is the A-A sectional view that Fig. 1 removes belt pulley.

Embodiment

The invention will be further described below in conjunction with concrete drawings and Examples.

As shown in the figure: this one-way belt sheave comprises belt pulley 1, inner ring body 2 and mandrel connecting sleeve 3, inner ring body 2 is enclosed within mandrel connecting sleeve 3 outsides, belt pulley 1 is enclosed within inner ring body 2 outsides, on mandrel connecting sleeve 3 left sides, right two end part are with bearing 6, the inner ring internal surface of described bearing 6 contacts with mandrel connecting sleeve 3 outer surfaces, the outer ring outer surface of bearing 6 contacts with belt pulley 1 endoporus wall, inner ring body 2 is enclosed within mandrel connecting sleeve 3 outsides between two bearings 6 opposing end surfaces, mandrel connecting sleeve 3 outer surfaces between two bearings 6 opposing end surfaces offer curve-surface cavity 8, be provided with needle roller 4 in the curve-surface cavity 8, described curve-surface cavity 8 sections are wedge shape, sense of rotation was consistent when the small end of curve-surface cavity 7 was worked with generator, the big end of curve-surface cavity 8 is provided with Returnning spring 9, described Returnning spring 9 is against on the needle roller 4 and pushes needle roller 4 small end of curve-surface cavity 8 to, also is with seal arrangement on mandrel connecting sleeve 3.

Mandrel connecting sleeve 3 outer surfaces between two bearings 6 opposing end surfaces have annular protrusion 10, and described curve-surface cavity 8 is opened on this annular protrusion 10.On the mandrel connecting sleeve 3 of annular protrusion 10 both sides, all be with capping 5, the opposing end surface of two cappings 5 contacts with annular protrusion 10 left and right both ends of the surface, the outer surface of capping 5 contacts with inner ring body 2 internal surfaces, outer surface in capping 5 offers circumferential groove, groove is embedded with seal ring 7, constitutes described seal arrangement by capping 5 and seal ring 7.

Comprise one section eccentric arc in the curve-surface cavity 8 of mandrel connecting sleeve 3 outer walls, a needle roller 4 is set in the raceway corresponding to each section eccentric arc; Spacing between one end of described eccentric arc and the inwall of described inner ring body 2 is greater than the diameter of needle roller 4, and the spacing between the inwall of the other end of described eccentric arc and described inner ring body 2 is less than the diameter of needle roller 4; Between adjacent two sections eccentric arcs, there is trapezoidal spoke to separate.Returnning spring 9 is housed on the spoke, and the present invention has saved plastic cage, and curve-surface cavity 8 can adopt cold-extruded technology single forming.

Described one-way belt sheave comprises the mandrel connecting sleeve 3 that belt pulley 1, inner ring body 2 are connected with generator shaft, the raceway that has the self-locking angle of wedge that forms between the curve-surface cavity 8 of inner ring body 2 inwalls and mandrel connecting sleeve 3, seal with capping 5 at curve-surface cavity 8 two ends, form a confined space, can store lubricating grease, one needle roller 4 and Returnning spring 9 are set in each curve-surface cavity, capping 5 outer ends are the positioning bearing 6 of two band seal rings 7, belt pulley component of the present invention are few, assemble more simple, long service life.

Claims

1. one-way belt sheave, comprise belt pulley (1), inner ring body (2) and mandrel connecting sleeve (3), inner ring body (2) is enclosed within mandrel connecting sleeve (3) outside, belt pulley (1) is enclosed within inner ring body (2) outside, on mandrel connecting sleeve (a 3) left side, right two end part are with bearing (6), the inner ring internal surface of described bearing (6) contacts with mandrel connecting sleeve (3) outer surface, the outer ring outer surface of bearing (6) contacts with belt pulley (1) endoporus wall, inner ring body (2) is enclosed within mandrel connecting sleeve (3) outside between two bearings (6) opposing end surface, it is characterized in that: mandrel connecting sleeve (3) outer surface between two bearings (6) opposing end surface offers curve-surface cavity (8), be provided with needle roller (4) in the curve-surface cavity (8), the section of described curve-surface cavity (8) is a wedge shape, the sense of rotation when small end of curve-surface cavity (8) points to generator work, the big end of curve-surface cavity (8) is provided with Returnning spring (9), described Returnning spring (9) is against on the needle roller (4), and push needle roller (4) small end of curve-surface cavity (8) to, on mandrel connecting sleeve (3), also be with seal arrangement;

Mandrel connecting sleeve (3) outer surface between two bearings (6) opposing end surface has annular protrusion (10), and described curve-surface cavity (8) is opened on this annular protrusion (10);

On the mandrel connecting sleeve (3) of annular protrusion (10) both sides, all be with capping (5), the opposing end surface of two cappings (5) contacts with the left and right both ends of the surface of annular protrusion (10), the outer surface of capping (5) contacts with inner ring body (2) internal surface, outer surface in capping (5) offers circumferential groove, groove is embedded with seal ring (7), constitutes described seal arrangement by capping (5) and seal ring (7).