CN214036734U

CN214036734U - Tension device

Info

Publication number: CN214036734U
Application number: CN202023141078.5U
Authority: CN
Inventors: 陈国亮
Original assignee: Taizhou Engi Automobile Parts Co ltd
Current assignee: Taizhou Engi Automobile Parts Co ltd
Priority date: 2020-12-23
Filing date: 2020-12-23
Publication date: 2021-08-24
Anticipated expiration: 2030-12-23

Abstract

The utility model provides a tight ware rises belongs to the automobile parts field. The tensioner comprises a mandrel, an upper arm and a stamping arm which are respectively arranged at the front end and the rear end of the mandrel, wherein an installation cavity is formed between the upper arm and the stamping arm, a torsion spring with two ends respectively connected with the upper arm and the stamping arm is arranged in the installation cavity, a bearing is arranged outside the front end of the upper arm, a cylindrical wheel shell is sleeved outside the bearing, and the wheel shell and an outer ring of the bearing are formed by one time by adopting the same material; the outer wall of the rear end of the upper arm is provided with an annular surface, the rear end of the wheel shell extends to the annular surface, an annular gap is formed between the inner wall of the wheel shell and the annular surface, and the radial width of the annular gap is 0.1-0.2 mm; the front end of the wheel shell is an annular step, the annular step is composed of an annular side wall and an annular bottom wall, a gasket is arranged in the annular step, the bearing is located between an annular surface and the gasket, the gasket is sleeved outside the mandrel and fixedly connected with the mandrel, the outer diameter of the gasket is larger than the inner diameter of the annular bottom wall, and the inner diameter of the gasket is smaller than the inner diameter of the inner ring of the bearing. The tensioner has long service life.

Description

Tension device

Technical Field

The utility model belongs to the automobile parts field relates to a tight ware rises.

Background

The tensioner is used as an important part of the engine and mainly used for supporting the belt so as to reduce the vibration of the belt span.

The existing tensioner is a tensioner structure (application number: 202020029441.5) disclosed by the applicant, and comprises a hollow mandrel, wherein a lower stamping arm, an upper arm and a torsion spring are sleeved outside the mandrel, the lower stamping arm is fixedly connected with the mandrel, the right end of the upper arm is rotatably connected with a wheel, the right end of the torsion spring is fixedly connected with the left end of the upper arm, the lower stamping arm is provided with a mounting hole which is arranged in a penetrating manner along the radial direction of the mandrel, and the left end of the torsion spring is inserted and embedded in the mounting hole; the punching press underarm right side link firmly the position sleeve that shape and size all match with the torsional spring, the position sleeve is arranged with the dabber coaxial line, the position sleeve right-hand member extends to upper arm department right, the torsional spring cover establish outside the position sleeve.

When the tensioner is applied to a humid environment, because two sides of the bearing are completely exposed outside, although two ends of the bearing are sealed by the sealing gaskets, the sealing gaskets are easy to age due to long-term contact with water, the service life of the bearing is influenced, and the service life of the tensioner is further influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a long-life tight ware that rises to the above-mentioned problem of prior art existence.

The purpose of the utility model can be realized by the following technical proposal: a tensioner comprises a mandrel, an upper arm and a stamping arm which are respectively arranged at the front end and the rear end of the mandrel, wherein an installation cavity is formed between the upper arm and the stamping arm, a torsion spring with two ends respectively connected with the upper arm and the stamping arm is arranged in the installation cavity, a bearing is arranged outside the front end of the upper arm, and a cylindrical wheel shell is sleeved outside the bearing; the outer wall of the rear end of the upper arm is provided with an annular surface which is coaxial with the mandrel, the rear end of the wheel shell extends to the annular surface, an annular gap is formed between the inner wall of the wheel shell and the annular surface, and the radial width of the annular gap is 0.1-0.2 mm; the front end of wheel shell is annular step, and annular step comprises annular lateral wall and annular diapire, is equipped with the gasket in the annular step, and the bearing is in between annular face and the gasket, and the gasket cover is outside the dabber, and gasket and dabber link firmly, and the external diameter of gasket is greater than annular diapire internal diameter, and the gasket internal diameter is less than the bearing inner circle internal diameter.

Wheel shell and bearing inner race formula structure as an organic whole make connection between them seamless, simultaneously, set up in the wheel shell front end and be used for sheltering from the gasket of bearing and form minimum clearance between wheel shell rear end and the upper arm to both sides form the manger plate structure around the bearing, effectively block water outside, thereby effectively reduce the probability of water and bearing contact, prolong the bearing life-span, thereby improve the tensioner life-span.

In the tensioner, the outer wall of the front end of the mandrel is provided with a flange which protrudes annularly, the flange is arranged on the front side of the gasket, and the edge of the inner side of the gasket is fixedly connected with the flange.

In the tensioner, the front end face of the gasket is attached to the rear end face of the flange, and the gasket is fixedly bonded with the flange.

The flange limits the installation of the gasket, and can increase the contact area of the gasket and the mandrel so as to improve the positioning stability of the gasket.

In the tensioner, the gasket is not in contact with the annular bottom wall and the upper arm, so that the interference on the swing of the upper arm is reduced, and the operation stability and precision are improved.

In the tensioner, a cylindrical large spring seat is arranged in the mounting cavity, the large spring seat is sleeved outside the mandrel and fixedly connected with the punching arm, the torsional spring is sleeved outside the large spring seat, an annular small spring seat is further integrally formed on the upper arm, the small spring seat is sleeved outside the mandrel and in the torsional spring, and the small spring seat is located between the gasket and the large spring seat. The large spring seat and the small spring seat are arranged in the axial direction of the mandrel to support the torsion spring, so that the supported area of the torsion spring is effectively prolonged, the running stability of the torsion spring is improved, and the working stability of the tensioner is improved.

In the tensioner described above, the radial width of the annular gap is 0.18 mm.

Compared with the prior art, the tensioner has the following advantages:

1. wheel shell and bearing inner race formula structure as an organic whole make connection between them seamless, simultaneously, set up in the wheel shell front end and be used for sheltering from the gasket of bearing and form minimum clearance between wheel shell rear end and the upper arm to both sides form the manger plate structure around the bearing, effectively block water outside, thereby effectively reduce the probability of water and bearing contact, prolong the bearing life-span, thereby improve the tensioner life-span.

2. The large spring seat and the small spring seat are arranged in the axial direction of the mandrel to support the torsion spring, so that the supported area of the torsion spring is effectively prolonged, the operation stability of the torsion spring is improved, and the working stability of the tensioner is improved.

Drawings

Fig. 1 is a schematic structural diagram of the tensioner.

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

In the figure, 1, a mandrel; 1a, a flange; 2. an upper arm; 2a, an annular surface; 2b, a small spring seat; 3. a punching arm; 4. a core sleeve; 5. a bearing; 6. a mounting cavity; 7. a torsion spring; 8. a wheel housing; 8a, an annular step; 8a1, annular sidewall; 8a2, annular bottom wall; 9. an annular gap; 10. a gasket; 11. a large spring seat.

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 fig. 1, the tensioner comprises a mandrel 1, an upper arm 2 and a punching wall, wherein the upper arm and the punching wall are both annular, and the punching arm 3 is sleeved and fixed outside the rear end of the mandrel 1; the upper arm 2 is sleeved outside the front end of the mandrel 1 through a core sleeve 4, a bearing 5 is arranged outside the front end of the upper arm 2, and the inner ring of the bearing 5 is fixedly connected with the upper arm 2; an installation cavity 6 is formed between the upper arm 2 and the stamping arm 3, a torsion spring 7 is arranged in the installation cavity 6, and the two ends of the torsion spring 7 are respectively connected with the upper arm 2 and the stamping arm 3. In the present embodiment, the preferred type of bearing 5 is a bearing 5 with gaskets at both ends.

Specifically, as shown in fig. 1 and 2, the bearing 5 is externally sleeved with a cylindrical wheel housing 8, the wheel housing 8 and the bearing 5 outer ring are formed by one-step processing of the same material, and the material can be a plastic material or a stainless steel material. As shown in figure 1, the outer wall of the rear end of the upper arm 2 is provided with an annular surface 2a which is coaxial with the mandrel 1, the rear end of the wheel housing 8 extends to the annular surface 2a, an annular gap 9 is formed between the inner wall of the wheel housing 8 and the annular surface 2a, and the radial width of the annular gap 9 is 0.1 mm-0.2 mm, preferably the radial width of the annular gap 9 is 0.18 mm. The front end of wheel shell 8 is annular step 8a, and annular step 8a comprises annular lateral wall 8a1 and annular diapire 8a2, is equipped with gasket 10 in the annular step 8a, and bearing 5 is in between annular face 2a and gasket 10, and gasket 10 cover is outside dabber 1, and gasket 10 and dabber 1 link firmly, and the external diameter of gasket 10 is greater than annular diapire 8a2 internal diameter, and gasket 10 internal diameter is less than the bearing 5 inner circle internal diameter. Wheel shell 8 and the 5 outer lane formula structures as an organic whole of bearing make connection between them seamless, simultaneously, set up in the 8 front ends of wheel shell and be used for sheltering from gasket 10 of bearing 5 and form minimum clearance between 8 rear ends of wheel shell and the upper arm 2 to both sides form the manger plate structure around bearing 5, in order effectively to block water outside, thereby effectively reduce the probability of water and the contact of bearing 5, prolong bearing 5 life-span, thereby improve the tensioner life-span.

Wherein,

the gasket 10 is mounted as follows: the gasket 10 is not in contact with the annular bottom wall 8a2 and the upper arm 2; the outer wall of the front end of the mandrel 1 is provided with a flange 1a protruding in an annular shape, the flange 1a and the mandrel 1 are coaxially arranged, the flange 1a is arranged on the front side of the gasket 10, and the edge of the inner side of the gasket 10 is fixedly connected with the flange 1 a. In this embodiment, the front end face of the gasket 10 is attached to the rear end face of the rib 1a, and the gasket 10 and the rib 1a are fixedly bonded. The rib 1a not only limits the installation of the gasket 10, but also increases the contact area between the gasket 10 and the mandrel 1, thereby improving the positioning stability of the gasket 10.

As shown in fig. 1, a cylindrical large spring seat 11 is arranged in the mounting cavity 6, the large spring seat 11 is sleeved outside the mandrel 1 and is fixedly connected with the stamping arm 3, the torsion spring 7 is sleeved outside the large spring seat 11, a small annular spring seat 2b is further integrally formed on the upper arm 2, the small spring seat 2b is sleeved outside the mandrel 1 and is located in the torsion spring 7, and the small spring seat 2b is located between the gasket 10 and the large spring seat 11. The large spring seat 11 and the small spring seat 2b are arranged in the axial direction of the mandrel 1 to support the torsion spring 7, so that the supported area of the torsion spring 7 is effectively increased, the running stability of the torsion spring 7 is improved, and the working stability of the tensioner is 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. A tensioner comprises a mandrel (1), an upper arm (2) and a stamping arm (3) which are respectively arranged at the front end and the rear end of the mandrel (1), wherein an installation cavity (6) is formed between the upper arm (2) and the stamping arm (3), a torsion spring (7) with two ends respectively connected with the upper arm (2) and the stamping arm (3) is arranged in the installation cavity (6), a bearing (5) is arranged outside the front end of the upper arm (2), and a cylindrical wheel shell (8) is sleeved outside the bearing (5), and is characterized in that the wheel shell (8) and the outer ring of the bearing (5) are formed by one-time processing of the same material; the outer wall of the rear end of the upper arm (2) is provided with an annular surface (2a) coaxial with the mandrel (1), the rear end of the wheel shell (8) extends to the position of the annular surface (2a), an annular gap (9) is formed between the inner wall of the wheel shell (8) and the annular surface (2a), and the radial width of the annular gap (9) is 0.1-0.2 mm; the front end of wheel shell (8) is annular step (8a), annular step (8a) comprises annular lateral wall (8a1) and annular diapire (8a2), be equipped with gasket (10) in annular step (8a), bearing (5) are in between annular face (2a) and gasket (10), gasket (10) cover is outside dabber (1), and gasket (10) and dabber (1) link firmly, the external diameter of gasket (10) is greater than annular diapire (8a2) internal diameter, and gasket (10) internal diameter is less than bearing (5) inner circle internal diameter.

2. The tensioner according to claim 1, wherein the outer wall of the front end of the mandrel (1) is provided with a flange (1a) which protrudes in an annular shape, the flange (1a) is arranged at the front side of the gasket (10), and the inner side edge of the gasket (10) is fixedly connected with the flange (1 a).

3. The tensioner according to claim 2, wherein the front end face of the gasket (10) is attached to the rear end face of the rib (1a), and the gasket (10) is fixedly bonded with the rib (1 a).

4. Tensioner according to claim 2 or 3, characterised in that neither the washer (10) is in contact with the annular bottom wall (8a2) nor the upper arm (2).

5. The tensioner according to claim 1, wherein a cylindrical large spring seat (11) is arranged in the mounting cavity (6), the large spring seat (11) is sleeved outside the mandrel (1) and fixedly connected with the stamping arm (3), the torsion spring (7) is sleeved outside the large spring seat (11), an annular small spring seat (2b) is further integrally formed on the upper arm (2), the small spring seat (2b) is sleeved outside the mandrel (1) and is located in the torsion spring (7), and the small spring seat (2b) is located between the gasket (10) and the large spring seat (11).

6. Tensioner according to claim 1, characterised in that the annular gap (9) has a radial width of 0.18 mm.