CN101968107A

CN101968107A - Idler assembly of high-sealing engine accessory gear train

Info

Publication number: CN101968107A
Application number: CN 201010271581
Authority: CN
Inventors: 刘彦华; 向以轩; 刘进; 杨汶坪; 胡春林
Original assignee: Chongqing Changan Automobile Co Ltd
Current assignee: Chongqing Changan Automobile Co Ltd
Priority date: 2010-09-03
Filing date: 2010-09-03
Publication date: 2011-02-09

Abstract

The invention relates to an idler assembly of a high-sealing engine accessory gear train. The idler assembly comprises a front dust cover, an idler body, a rear dust cover and a mandrel, wherein the dust covers are arranged on both sides of an idler bearing simultaneously; the front dust cover covers the bearing front side of the idler body and is pressed on a bearing inner ring tightly by nuts for assembling the idler assembly to an engine; and the rear dust cover covers the bearing rear side of the idler body, the inner edge of the rear dust cover is pressed on the bearing inner ring tightly by the mandrel, and the rest part bypasses a plastic coated convex plate of a wheel at a bearing outer ring and extends above a reinforcing rib of the wheel to maintain a gap with the bearing outer ring and the wheel. In the idler assembly, the front and the rear dust covers are fastened outside the bearing to protect the bearing, so the abnormal sound of the bearing due to the entrance of silt and dust can be reduced, and the service life of the bearing is prolonged.

Description

A kind of high leak tightness engine accessory wheel system idle pulley assembly

Technical field

The present invention relates to motor car engine accessory wheel system system, particularly relate to the sealing structure of engine accessory wheel system idle pulley bearing.

Background technique

Existing engine accessory wheel system generally is made up of component such as idle pulley body, mandrel, preceding dust covers with the idle pulley assembly.And, promptly then do not take any seal approach to protect the bearing of idle pulley assembly near a side of cylinder body at the rear of idle pulley assembly.Its shortcoming is: when the Environmental Conditions of idle pulley is abominable, foreign matter such as dust, silt can enter bearing inside near cylinder body one side by the idle pulley assembly, cause idle pulley bearing grease deterioration, and then idle pulley can cause abnormal sound because of bearing ball and Internal and external cycle dry friction in when operation, make the NVH decreased performance of motor and car load, idle pulley reduces working life, causes after cost to increase.

Summary of the invention

The purpose of this invention is to provide a kind of simple in structure, compact, easy to assembly, engine accessory wheel system idle pulley assembly that sealing is high, solve low problem of engine accessory wheel system idle pulley assembly life-span and promote motor and car load NVH performance.

Technological scheme of the present invention is as follows:

A kind of high leak tightness engine accessory wheel system idle pulley assembly, it is made up of idle pulley body, preceding dust cover, back dust cover and mandrel.The idle pulley body is made up of bearing and the plastic thereon wheel that forms, and is used for changing the direction of belt and the belt contact of associated part.Mandrel is to make idle pulley be contained in supporter on the carriage, mandrel and bearing inner race interference fit, and the size by the control mandrel guarantees the distance of idle pulley center line to carriage.Before dust cover cover bearing front side at the idle pulley body, be attached on the bearing inner race itself and the front end of mandrel 0.12-0.3mm apart to the nut on the motor by assembling idle pulley assembly.Back dust cover covers the bearing rear side at the idle pulley body, along being attached on the bearing inner race by mandrel, remaining part is walked around the plastic boss of wheel at bearing outer ring place, covers bearing fully in it, and extend to the stiffening rib top of wheel, the gap that keeps minimum 1mm with bearing outer ring and wheel.

This idle pulley assembly reasonably gathers together each assembly, forms an overall structure, and compact structure is beneficial to assembling.Simultaneously owing to all increased dust cover in the both sides, front and back of idle pulley bearing; significantly reduce foreign matters such as silt, dust and enter idle pulley bearing inside; make bearing grease not by the foreign matter deterioration; or after avoiding idle pulley bearing grease deterioration; the abnormal sound that bearing ball and bearing enclose dry friction cause; than also well protecting the idle pulley bearing under the condition of severe, prolong the life-span of idle pulley in the idle pulley Environmental Conditions, improve the NVH performance of car load and motor.Simultaneously, back dust cover is pressed on the bearing inner race by mandrel, can not relatively move with idle pulley bearing inner race and mandrel, makes things convenient for idle pulley to be installed on the carriage.

Description of drawings

Fig. 1 is the composition schematic representation of idle pulley assembly.

The structural representation of Fig. 2 idle pulley body 2.

Fig. 3 is the generalized section of idle pulley assembly.

Fig. 4 is that this idle pulley assembly is installed to back schematic representation on the carriage.

Embodiment

As shown in Figure 1; this engine accessory wheel system idle pulley assembly comprises idle pulley body 2, mandrel 4, preceding dust cover 1 and back dust cover 3; all there are a

dust cover

1 and 3 in the both sides, front and back of idle pulley bearing 22; two dust covers are close to bearing inner race 26; walk around the plastic boss of bearing outer ring place wheel; with boss at a distance of 1mm; and extend to the top of the stiffening rib of wheel 21; as shown in Figure 2; dust cover can cover on idle pulley bearing 22 completely like this, plays protection idle pulley bearing, reduces the effect that dust silt enters bearing sealed ring 24 inside.Simultaneously dust cover is close on the bearing inner race 26, and the gap that keeps minimum 1mm with bearing outer ring 23 and wheel 21, idle pulley can rotate freely like this.Mandrel 3 is φ 17 with bearing inner race 26 for its fit dimension of interference fit

/ φ 17 ± 0.006mm, back dust cover 3 is attached on the bearing inner race 26 by mandrel 4, it can not relatively move with respect to mandrel 4 and bearing inner race 26, and preceding dust cover 1 is movable, when assembling, be that nut is attached on the inner ring of bearing 2, simultaneously with the front end of mandrel 4 at a distance of 0.12-0.3mm.

The assembling of idle pulley assembly, back dust cover 3 is attached on the inner ring 26 of idle pulley body bearing 22, simultaneously with the center of back dust cover 3 and the center-aligned of bearing inner race 26, mandrel 4 exerted pressure pass back dust cover 3 center holes and be pressed in the bearing inner race 26, fit fully up to back dust cover 3 end faces and bearing inner race 26 end faces, and back dust cover 3 can not relative movement with respect to mandrel 4 and bearing inner race 26, after the installation as shown in Figure 3.

The idle pulley assembly is installed on the carriage, the idle pulley assembly is enclosed within on the bolt 6 that passes carriage 5, nut 7 is urgent, and dust cover 1 should fit tightly with the exterior edge face of idle pulley bearing inner race 26 before this moment, and preceding dust cover 1 can not relatively move with respect to bearing inner race 26 and bolt 6, nut 7.The assembling finish after as shown in Figure 4.

Claims

1. high leak tightness engine accessory wheel system idle pulley assembly, it comprises idle pulley body (2), mandrel (4) and preceding dust cover (1); Idle pulley body (2) is made up of bearing (22) and the plastic thereon wheel that forms (21); Mandrel (3) and bearing inner race (26) interference fit; Before dust cover (1) cover in bearing (22) front side, be attached on the bearing inner race (26) itself and the front end of mandrel (4) 0.12-0.3mm apart to the nut on the motor by assembling idle pulley assembly;

It is characterized in that: also be provided with back dust cover (3), it covers at bearing (22) rear side, edge is attached on the bearing inner race (26) by mandrel (4) in it, remaining part is walked around the plastic boss of wheel that bearing outer ring (23) is located, and extend to above the stiffening rib of wheel (21), cover bearing (22) fully, and the gap that keeps minimum 1mm with bearing outer ring (23) and wheel (21).