CN210265724U - Novel tensioner - Google Patents

Abstract

The utility model relates to a novel tight ware rises, including fixed casing, a spring, tight arm and wheel body rise, be equipped with antifriction bearing and through bolt interconnect between wheel body and the tight arm that rises, the centre bore has been seted up to the tight arm that rises, the centre bore is equipped with self-lubricating bearing, the tight arm that rises rotates around self-lubricating bearing body, it is equipped with the axle sleeve to rise between tight arm and the self-lubricating bearing, be provided with first rubber shield between centre bore and the self-lubricating bearing, the one end that fixed casing corresponds first rubber shield is equipped with the step by wide narrowing, first rubber shield is equipped with the annular step face with step looks adaptation, the beneficial effects of the utility model are that: the fixed shell is movably connected with the tensioning arm through the self-lubricating bearing, the wheel body is movably connected with the tensioning arm through the rolling bearing, the spring enables the tensioning arm and the fixed shell to generate a rotating force, the first rubber dustproof cover with the annular step surface is arranged to prevent dust from entering the tensioner, the precision of the tensioner is improved, the friction coefficient is reduced, and the service life of the tensioner is prolonged.

Description

Novel tensioner

Technical Field

The utility model relates to a tight ware field that rises, concretely relates to novel tight ware that rises.

Background

The tensioner acts on a timing belt or a timing chain of the engine, plays a role in guiding and tensioning the timing belt or the timing chain, and is always in the optimal tensioning state. The method is generally divided into two modes of oil pressure and machinery, and the two modes can automatically adjust the tightness of the timing belt and the timing chain.

However, in the actual use process, as the tensioner is installed at the front end of the engine, during the driving process of the vehicle, dust in the air can enter the rolling bearing of the tensioner to cause the bearing to be stuck, thereby affecting the connection between the belt or the chain and the bearing, causing the tensioner to deflect, causing the bearing to be overheated, causing abnormal sound of the engine, and affecting the normal operation of the engine.

And when the existing tensioner is continuously used, the wheel body is easy to wear due to overlarge friction coefficient, the service life is short, and the problem needs to be solved by a novel tensioner.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to solve the above-mentioned deficiencies of the prior art,

provides a novel tensioner with good dust resistance, low friction coefficient and long service life.

In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a novel tensioner rises, including fixed casing, the spring of setting in fixed casing, set up on fixed casing can be for fixed casing wobbling tight arm that rises and with the wheel body that rises tight arm looks fixed connection, be equipped with antifriction bearing and through bolt interconnect, its characterized in that between wheel body and the tight arm that rises: the center of the tension arm is provided with a center hole, a self-lubricating bearing is assembled in the center hole, the tension arm rotates relative to the fixed shell around the self-lubricating bearing, a shaft sleeve with a low friction coefficient is arranged between the tension arm and the self-lubricating bearing, one end of the spring is connected with the bottom of the fixed shell, the other end of the spring is connected with the tension arm, the tension arm and the fixed shell generate rotating force through the spring, a first rubber dust cover is arranged between the center hole of the tension arm and the self-lubricating bearing, one end of the fixed shell, corresponding to the first rubber dust cover, is provided with a step with a narrowed width, and the first rubber dust cover is provided with an annular step surface matched with the step.

By adopting the technical scheme, the fixed shell is movably connected with the tension arm through the self-lubricating bearing, the wheel body is movably connected with the tension arm through the rolling bearing, and the tension arm and the fixed shell generate rotating force through the spring to realize the tension function, wherein the self-lubricating bearing can be continuously lubricated in an oil-free or oil-less state, has good wear resistance and low friction coefficient, prolongs the service life of a product, carries out zinc plating treatment on the surface of a bolt, achieves the strength of 10.9 grade, adopts the aluminum alloy with the model of ALS19CU3 as the tension arm and the fixed shell, has mechanical property exceeding the normal stress range of the tension device, uses a CNC machining center for the tension arm, can control the machining precision within 0.005mm, greatly improves the precision of the tension device, reduces the friction coefficient and improves the service life of the product, and prevents dust from entering the self-lubricating bearing by arranging the first rubber cover between the center hole and the self-lubricating bearing, guarantee that the bearing lasts lubricated, through the rubber lid body that sets up annular step face at first rubber shield, be equipped with the step by the width narrowing at the one end that fixed casing corresponds first rubber shield, make the clearance between fixed casing and the tight arm that rises separate into two contact surfaces of height width nonconformity through first rubber shield, both guaranteed that first rubber shield can not drop easily at the tight ware during operation that rises, improved first rubber shield dustproof and waterproof performance again.

The novel tensioner can be further set as follows: and a second rubber dustproof cover for sealing the wheel body is arranged at one end of the wheel body corresponding to the bolt.

By adopting the technical scheme, in order to prevent dust in the air from entering the wheel body from the connecting gap between the bolt and the wheel body, and further influence the operation of the rolling bearing, the second rubber dustproof cover for sealing the wheel body is arranged at one end of the wheel body corresponding to the bolt, the bolt which is well fixed is completely sealed by the second rubber dustproof cover, and the dustproof performance of the tensioner is improved.

The novel tensioner can be further set as follows: the surfaces of the first rubber dustproof cover and the second rubber dustproof cover are both provided with water guide grooves.

By adopting the technical scheme, the water chute is arranged at the other end of the first rubber dustproof cover or the second rubber dustproof cover, which corresponds to one end of the fixed shell or the wheel body, so that rainwater or steam is led out of the fixed shell or the wheel body along with the water chute when the surface of the first rubber dustproof cover or the second rubber dustproof cover is attached to the fixed shell or the wheel body, and the rainwater or the steam is prevented from entering the fixed shell or the wheel body along the first rubber dustproof cover or the second rubber dustproof cover.

The novel tensioner can be further set as follows: lubricating grease is attached to both the shaft sleeve and the rolling bearing.

By adopting the technical scheme, because the self-lubricating bearing and the rolling bearing in the shaft sleeve can be heated in the operation process, the lubricating grease has high viscosity and good lubricating performance at high temperature, and has good fluidity at low temperature so as to ensure that the lubricating grease can lubricate the whole parts when not in operation, and also has the water-resistant and rust-proof capability, the friction coefficient is greatly reduced, and the service life of the tensioner is prolonged.

The novel tensioner can be further set as follows: the tensioning arm and the fixed shell are both made of aluminum alloy.

By adopting the technical scheme, the tensioning arm and the fixed shell are made of the aluminum alloy with the model number of ALS19CU3, the mechanical property exceeds the normal stress range of the tensioner, the tensioning arm uses a CNC machining center, the machining precision can be controlled within 0.005mm, the precision of the tensioner is greatly improved, the friction coefficient is reduced, and the service life of the tensioner is prolonged.

The utility model has the advantages that: the fixed shell is movably connected with the tensioning arm through the self-lubricating bearing, the wheel body is movably connected with the tensioning arm through the rolling bearing, the spring enables the tensioning arm and the fixed shell to generate a rotating force, the first rubber dustproof cover with the annular step surface is arranged to prevent dust from entering the tensioner, the precision of the tensioner is improved, the friction coefficient is reduced, and the service life of the tensioner is prolonged.

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Drawings

Fig. 1 is a cross-sectional view of an embodiment of the present invention.

Fig. 2 is an enlarged view of fig. 1 at a.

Detailed Description

As shown in fig. 1-2, a novel tensioner comprises a fixed housing 1, a spring 2 disposed in the fixed housing 1, a tensioner arm 3 disposed on the fixed housing 1 and capable of swinging relative to the fixed housing 1, and a wheel body 4 fixedly connected to the tensioner arm 3, wherein a rolling bearing 5 is disposed between the wheel body 4 and the tensioner arm 3 and is connected to each other through a bolt 6, and is characterized in that: a central hole 31 is formed in the center of the tension arm 3, a self-lubricating bearing 7 is assembled in the central hole 31, the tension arm 3 rotates around the self-lubricating bearing 7 relative to the fixed housing 1, a shaft sleeve 71 with a low friction coefficient is arranged between the tension arm 3 and the self-lubricating bearing 7, one end of the spring 2 is connected with the bottom of the fixed housing 1, the other end of the spring is connected with the tension arm 3, the tension arm 3 and the fixed housing 1 generate a rotating force through the spring 2, a first rubber dust cap 8 is arranged between the central hole 31 of the tension arm 3 and the self-lubricating bearing 7, one end of the fixed housing 1 corresponding to the first rubber dust cap 8 is provided with a step 11 which is narrowed from width, the first rubber dust cap 8 is provided with an annular step surface which is matched with the step 11, one end of the wheel body 4 corresponding to the bolt 6 is provided with a second rubber dust cap 9 which seals the wheel body 4, and the surfaces of the first rubber dust cap 8 and the second rubber dust cap 9 are provided, lubricating grease is attached to both the shaft sleeve 71 and the rolling bearing 5, and the tensioning arm 3 and the fixed shell 1 are made of aluminum alloy.

Claims (5)

1. The utility model provides a novel tensioner rises, including fixed casing, the spring of setting in fixed casing, set up on fixed casing can be for fixed casing wobbling tight arm that rises and with the wheel body that rises tight arm looks fixed connection, be equipped with antifriction bearing and through bolt interconnect, its characterized in that between wheel body and the tight arm that rises: the center of the tension arm is provided with a center hole, a self-lubricating bearing is assembled in the center hole, the tension arm rotates relative to the fixed shell around the self-lubricating bearing, a shaft sleeve with a low friction coefficient is arranged between the tension arm and the self-lubricating bearing, one end of the spring is connected with the bottom of the fixed shell, the other end of the spring is connected with the tension arm, the tension arm and the fixed shell generate rotating force through the spring, a first rubber dust cover is arranged between the center hole of the tension arm and the self-lubricating bearing, one end of the fixed shell, corresponding to the first rubber dust cover, is provided with a step with a narrowed width, and the first rubber dust cover is provided with an annular step surface matched with the step.

2. The novel tensioner as claimed in claim 1, wherein: and a second rubber dustproof cover for sealing the wheel body is arranged at one end of the wheel body corresponding to the bolt.

3. The novel tensioner as claimed in claim 2, wherein: the surfaces of the first rubber dustproof cover and the second rubber dustproof cover are both provided with water guide grooves.

4. The novel tensioner as claimed in claim 3, wherein: lubricating grease is attached to both the shaft sleeve and the rolling bearing.

5. The novel tensioner as claimed in claim 4, wherein: the tensioning arm and the fixed shell are both made of aluminum alloy.

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