CN210087925U

CN210087925U - Tensioner

Info

Publication number: CN210087925U
Application number: CN201920703567.3U
Authority: CN
Inventors: 陈国亮
Original assignee: TAIZHOU ENGI AUTOMOBILE PARTS Co Ltd
Current assignee: TAIZHOU ENGI AUTOMOBILE PARTS Co Ltd
Priority date: 2019-05-16
Filing date: 2019-05-16
Publication date: 2020-02-18
Anticipated expiration: 2029-05-16

Abstract

The utility model provides a tensioning ware belongs to the auto-parts field. It has solved the current not good problem of tensioning ware job stabilization nature. This tensioning ware includes the swing arm and locates band pulley and the base of swing arm both sides respectively, the band pulley is rotatable installs on the swing arm, the swing arm passes through the dabber and is connected with the base rotation, the tube-shape supporting part has on the swing arm, the supporting part cover is established outside the dabber, the supporting part, form the installation cavity between swing arm and the base, be equipped with the torsional spring in the installation cavity, the torsional spring cover is outside the supporting part, the torsional spring both ends link to each other with base and swing arm respectively, the supporting part overcoat has the tube-shape spring holder, spring holder one end is supported and is pressed on the base, the spring holder is supported and is pressed on the spring holder, the spring holder is once only machine-shaping by plastic materials, the spring holder hole includes the taper hole that the diameter diminishes gradually to. The tensioner has the advantage of stable operation.

Description

Tensioner

Technical Field

The utility model belongs to the auto-parts field relates to a tensioning ware, especially a car tensioning ware.

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.

There are many types of mechanical tensioners available on the market, and one of them comprises a belt pulley, a swing arm and a base arranged between the belt pulley and the swing arm, wherein the belt pulley and the swing arm are rotatably connected; the swing arm and the base are rotatably connected through a mandrel, a torsion spring is sleeved on the mandrel, and two ends of the torsion spring are respectively connected with the swing arm and the mandrel; be equipped with the spring holder between torsional spring and the dabber, the spring holder generally adopts split type structure to form by the two parts tight fit that all are the tube-shape, and during the installation, one of them part links firmly with the dabber, and another part supports presses on the base. When the belt tensioner is used, the base is connected with the engine part to drive the swing arm to swing, and the belt pulley is controlled to tension the belt through the torsion spring, so that the belt tensioner has the advantage of convenience in use.

The above-described tensioner has a problem: there is certain friction between base and the spring holder, leads to spring holder two parts to have relative pivoted trend, and the time is long, and spring holder structure is out of order, influences the work of torsional spring, influences tensioning ware work then.

SUMMERY OF THE UTILITY MODEL

The utility model aims at having above-mentioned problem to current technique, provided a tensioning ware, the technical problem of solution is how to improve job stabilization nature.

The purpose of the utility model can be realized by the following technical proposal: a tensioner comprises a swing arm, a belt wheel and a base which are respectively arranged on two sides of the swing arm, the belt wheel is rotatably arranged on the swing arm, the swing arm is rotatably connected with the base through a mandrel, a cylindrical supporting part is arranged on the swing arm, the supporting part is sleeved outside the mandrel, an installation cavity is formed among the supporting part, the swing arm and the base, a torsional spring is arranged in the installation cavity and sleeved outside the supporting part, the two ends of the torsional spring are respectively connected with the base and the swing arm, it is characterized in that a tubular spring seat is sleeved outside the supporting part, one end of the spring seat is pressed against the base, the spring seat is positioned in the torsion spring, and one end of the torsion spring is abutted against the spring seat, the spring seat is formed by processing plastic materials at one time, an inner hole of the spring seat comprises a taper hole of which the diameter is gradually reduced from the belt wheel to the direction of the base, a conical surface matched with the taper hole is arranged on the outer side wall of the supporting part, and the conical surface is tightly abutted against the hole wall of the taper hole.

The spring seat is a plastic integrated piece and has higher structural stability; simultaneously, support through conical surface and taper hole cooperation and spring holder one end and press on the base to effectively restrict the spring holder in the axial, thereby improve the stability of being connected of spring holder and supporting part, make the spring holder play better support guide effect to the torsional spring all the time, improve this tensioning ware's job stabilization nature.

In the tensioner, the outer side wall of the spring seat is integrally formed with an annular supporting seat, the supporting seat and the spring seat are coaxially arranged, and two end faces of the supporting seat respectively abut against the torsion spring and the base.

In foretell tensioning ware, the spring holder be close to the hole of stepping down of the one end of base for being the toper, the hole of stepping down is located between taper hole and the base, and the aperture in the hole of stepping down is by band pulley to base direction grow gradually. Adopt above-mentioned design to reduce the area of contact of base and spring holder, reduce the friction between the two, thereby improve job stabilization nature and life-span.

In the above tensioner, the above belt pulley comprises a cylindrical housing and a bearing located in the housing, the outer side wall of the housing is a circumferential surface, and the inner ring and the outer ring of the bearing are fixedly connected with the swing arm and the housing respectively.

In the above tensioner, the swing arm is fixed with a pressing member, and the pressing member acts on one end surface of the bearing inner ring and presses the other end surface of the bearing inner ring against the swing arm. Under the effect of the pressing piece, the axial movement of the bearing is effectively prevented, and the working stability is improved.

In the above tensioner, the swing arm is provided with a threaded hole along the axial direction of the bearing in a penetrating manner, the pressing piece comprises a bolt screwed in the threaded hole and an annular dustproof cover sleeved outside the rod part of the bolt, and two end faces of the annular dustproof cover are respectively and tightly abutted against the head of the bolt and the end face of the inner ring of the bearing. By adopting the design, the device has the advantages of simple structure and convenience in installation.

In the above tensioner, the annular dust cap has an outer diameter larger than an outer diameter of the bearing outer race.

As another scheme, in the above tensioner, the swing arm has a threaded hole penetrating in the axial direction of the bearing, the pressing member includes a bolt screwed into the threaded hole, and the head of the bolt is pressed against the end face of the bearing inner race.

Compared with the prior art, the tensioner has the advantages that the spring seat is a plastic integrated piece, so that the spring seat has higher structural stability; simultaneously, support through conical surface and taper hole cooperation and spring holder one end and press on the base to effectively restrict the spring holder in the axial, thereby improve the stability of being connected of spring holder and supporting part, make the spring holder play better support guide effect to the torsional spring all the time, improve this tensioning ware's job stabilization nature.

Drawings

Fig. 1 is a schematic structural view of the present tensioner.

Fig. 2 is a schematic view of the structure of the spring seat.

In the figure, 1, a swing arm; 1a, a threaded hole; 1b, a support part; 2. a pulley; 2a, a shell; 2b, a bearing; 3. a base; 4. a mandrel; 5. a bolt; 6. an annular dust cover; 7. A core sleeve; 8. a mounting cavity; 9. a torsion spring; 10. a spring seat; 10a, a taper hole; 10b, a support seat; 10c, a yielding hole.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in figure 1, the tensioner comprises a swing arm 1, a belt wheel 2 and a base 3, wherein the belt wheel 2 and the base 3 are respectively arranged on two sides of the swing arm 1, the belt wheel 2 is rotatably arranged on the swing arm 1, and the swing arm 1 is rotatably connected with the base 3 through a mandrel 4.

Wherein, the connection mode of band pulley 2 and swing arm 1 is as follows: the belt wheel 2 comprises a cylindrical shell 2a and a bearing 2b positioned in the shell 2a, the outer side wall of the shell 2a is a circumferential surface, and the inner ring and the outer ring of the bearing 2b are fixedly connected with the swing arm 1 and the shell 2a respectively. Preferably, the inner ring and the outer ring of the bearing 2b are fixedly connected with the swing arm 1 and the shell 2a respectively in an interference fit mode. Further, the swing arm 1 is fixed with a pressing member, the pressing member acts on one end surface of the inner ring of the bearing 2b and presses the other end surface of the inner ring of the bearing 2b against the swing arm 1, so as to effectively prevent the bearing 2b from axially moving and improve the working stability. In this embodiment, swing arm 1 runs through along bearing 2 b's axial and is equipped with screw hole 1a, compresses tightly the piece including the bolt 5 of spiro union in screw hole 1a and the cover annular shield 6 outside 5 poles of the bolt portion, and the external diameter of annular shield 6 is greater than the external diameter of bearing 2b outer lane, and the both ends face of annular shield 6 closely supports with the terminal surface of the head of bolt 5 and bearing 2b inner circle respectively and leans on. Naturally, the pressing member may be only the bolt 5 screwed in the threaded hole 1a, and the head of the bolt 5 is pressed against the end face of the inner race of the bearing 2 b.

The connection mode of swing arm 1, dabber 4 and base 3 three is as follows: as shown in fig. 1, one end of the mandrel 4 is fixedly connected with the base 3, the swing arm 1 is provided with a cylindrical supporting portion 1b, and the supporting portion 1b is sleeved outside the mandrel 4. Be equipped with the core cover 7 that possesses self-lubricating effect between core cover 7 and the supporting part 1b, and the inside wall and the lateral wall of core cover 7 offset with 4 lateral walls of dabber and supporting part 1b inside walls respectively. An installation cavity 8 is formed between the supporting part 1b, the swing arm 1 and the base 3, a torsion spring 9 is arranged in the installation cavity 8, the torsion spring 9 is sleeved outside the supporting part 1b, and two ends of the torsion spring 9 are respectively connected with the base 3 and the swing arm 1.

To explain further, as shown in fig. 1 and 2, the support portion 1b is externally fitted with a tubular spring seat 10, and one end of the spring seat 10 abuts against the base 3. The spring seat 10 is located in the torsion spring 9, and one end of the torsion spring 9 is pressed against the spring seat 10. The spring seat 10 is formed by processing a plastic material at one time, an inner hole of the spring seat 10 comprises a taper hole 10a, the diameter of the taper hole is gradually reduced from the belt wheel 2 to the base 3, a conical surface matched with the taper hole 10a is arranged on the outer side wall of the supporting portion 1b, and the conical surface is tightly abutted against the hole wall of the taper hole 10 a. In this embodiment, an annular supporting seat 10b is integrally formed on an outer side wall of the spring seat 10, the supporting seat 10b is coaxially disposed with the spring seat 10, and two end surfaces of the supporting seat 10b respectively abut against the torsion spring 9 and the base 3.

Furthermore, the inner hole of the spring seat 10 near one end of the base 3 is a tapered yielding hole 10c, the yielding hole 10c is located between the tapered hole 10a and the base 3, and the aperture of the yielding hole 10c is gradually enlarged from the belt pulley 2 to the base 3. By adopting the design, the contact area between the base 3 and the spring seat 10 is reduced, the friction between the base and the spring seat is reduced, and the working stability and the service life are improved.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The tensioner comprises a swing arm (1), belt wheels (2) and a base (3) which are respectively arranged on two sides of the swing arm (1), wherein the belt wheels (2) are rotatably arranged on the swing arm (1), the swing arm (1) is rotatably connected with the base (3) through a mandrel (4), a cylindrical supporting part (1b) is arranged on the swing arm (1), the supporting part (1b) is sleeved outside the mandrel (4), the supporting part (1b), an installation cavity (8) is formed between the swing arm (1) and the base (3), a torsion spring (9) is arranged in the installation cavity (8), the torsion spring (9) is sleeved outside the supporting part (1b), two ends of the torsion spring (9) are respectively connected with the base (3) and the swing arm (1), the tensioner is characterized in that a cylindrical spring seat (10) is sleeved outside the supporting part (1b), one end of the spring seat (10) is pressed on the base (3), and the spring seat (10) is positioned in the torsion spring (9, and the one end of torsional spring (9) supports and presses on spring holder (10), spring holder (10) once only machine-shaping by plastic materials, the hole of spring holder (10) includes that a diameter is by band pulley (2) taper hole (10a) that become little gradually to base (3) direction, has the conical surface that matches with taper hole (10a) on the lateral wall of supporting part (1b), and the conical surface closely supports and leans on together with the pore wall of taper hole (10 a).

2. The tensioner according to claim 1, wherein the outer side wall of the spring seat (10) is integrally formed with an annular support seat (10b), the support seat (10b) is coaxially disposed with the spring seat (10), and two end faces of the support seat (10b) respectively abut against the torsion spring (9) and the base (3).

3. The tensioner according to claim 1 or 2, wherein the inner hole of the spring seat (10) near the base (3) is a tapered yielding hole (10c), the yielding hole (10c) is located between the tapered hole (10a) and the base (3), and the diameter of the yielding hole (10c) is gradually increased from the pulley (2) to the base (3).

4. The tensioner of claim 1, wherein the pulley (2) comprises a cylindrical housing (2a) and a bearing (2b) disposed in the housing (2a), the outer side wall of the housing (2a) is a circumferential surface, and the inner ring and the outer ring of the bearing (2b) are fixedly connected to the swing arm (1) and the housing (2a), respectively.

5. A tensioner according to claim 4, characterized in that the swing arm (1) is fixed with a pressing member which acts on one of the end faces of the inner race of the bearing (2b) and presses the other end face of the inner race of the bearing (2b) against the swing arm (1).

6. The tensioner according to claim 5, wherein the swing arm (1) is provided with a threaded hole (1a) along the axial direction of the bearing (2b) in a penetrating manner, the pressing member comprises a bolt (5) screwed in the threaded hole (1a) and an annular dust cap (6) sleeved outside the rod part of the bolt (5), and two end faces of the annular dust cap (6) are respectively and tightly abutted against the head part of the bolt (5) and the end face of the inner ring of the bearing (2 b).

7. A tensioner according to claim 6, characterised in that said annular dust cover (6) has an outer diameter greater than the outer diameter of the outer race of the bearing (2 b).

8. The tensioner according to claim 5, wherein the swing arm (1) is provided with a threaded hole (1a) extending through the bearing (2b) in the axial direction, the pressing member comprises a bolt (5) screwed into the threaded hole (1a), and the head of the bolt (5) is pressed against the end face of the inner ring of the bearing (2 b).