CN217814813U

CN217814813U - Tensioning wheel with high reliability

Info

Publication number: CN217814813U
Application number: CN202221267502.7U
Authority: CN
Inventors: 罗东泽; 刘世文; 李洪朋; 朱炎銘
Original assignee: Dayco Suzhou Co Ltd
Current assignee: Daigao Suzhou Drive System Co ltd
Priority date: 2022-05-25
Filing date: 2022-05-25
Publication date: 2022-11-15
Anticipated expiration: 2032-05-25

Abstract

The utility model discloses a take-up pulley that reliability is high, include: the rocker arm is Z-shaped and comprises a vertical connecting plate, two spring shafts and a pulley shaft, wherein the two spring shafts and the pulley shaft are reversely and horizontally arranged; the spring shaft and the belt wheel shaft are hollow shafts; the tensioning structure is arranged on the spring shaft and comprises a spring shell, a volute spiral spring and a pivot shaft, the spring shell, the volute spiral spring and the pivot shaft are coaxially arranged, the volute spiral spring is arranged in the spring shell, and the pivot shaft penetrates through the volute spiral spring and is in riveting connection with the spring shaft; a spring isolation belt is arranged in the scroll spring, and a first bushing is sleeved on the pivot; the belt wheel structure is arranged on a belt wheel shaft and comprises a belt wheel, and the belt wheel is connected with the belt wheel shaft through a bearing; the damping structure, damping structure and the coaxial setting of straining structure, and set up the one side that deviates from straining structure at the rocking arm. The utility model discloses a take-up pulley spatial layout that the reliability is high is compact, and is longe-lived, can automatic tensioning maintain the required tension of system.

Description

Tensioning wheel with high reliability

Technical Field

The utility model relates to a take-up pulley technical field especially relates to a take-up pulley that reliability is high.

Background

Belt drives are widely used in automotive engines where it is essential to maintain moderate belt tension using a tension pulley during belt operation, and belt driven gear train accessory systems are typically mounted on the front end surface of the engine, each accessory being mounted on a pulley on a shaft for receiving power from some form of belt transmission.

Most older truck engines typically employ a single V-belt that is looped between accessory components to drive all of the accessories, and the use of the belt increases the efficiency of the engine assembly while making the engine more compact and less costly. The belt must have certain tension when normally working, if the belt tension is not enough, the belt can easily cause skidding, and then a series of system failures are caused, such as abnormal belt sound, reduction of driving capability of a wheel train, increase of friction loss and the like. Therefore, it is very important to maintain the tension pulley at an appropriate tension.

In addition, as the loads required to be driven by the truck accessory system are increased and at least comprise a fan, a water pump, a motor, an air conditioner and the like, the layout of the accessory system is more and more compact, the available space is gradually reduced, the size requirement on the tension wheel is also gradually strict, and the conventional U-shaped tension wheel design cannot meet the requirement of the spatial layout.

SUMMERY OF THE UTILITY MODEL

For overcoming the defect among the current take-up pulley technique, the utility model discloses a main aim at provides a take-up pulley that the reliability is high, and spatial layout is compact, and is longe-lived, can maintain the required tension of system by automatic tensioning.

The purpose of the utility model can be realized through the following technical scheme:

the utility model provides a take-up pulley that reliability is high, include:

the rocker arm is Z-shaped and comprises a vertical connecting plate, two spring shafts and a pulley shaft, wherein the two spring shafts and the pulley shaft are reversely and horizontally arranged; the spring shaft and the pulley shaft are hollow shafts;

the tensioning structure is arranged on the spring shaft and comprises a spring shell, a volute spiral spring and a pivot shaft, the spring shell, the volute spiral spring and the pivot shaft are coaxially arranged, the volute spiral spring is arranged in the spring shell, and the pivot shaft penetrates through the volute spiral spring and is in riveted connection with the spring shaft; a spring isolation belt is arranged in the volute spiral spring, and a first bushing is sleeved on the pivot;

the belt wheel structure is arranged on the belt wheel shaft and comprises a belt wheel, and the belt wheel is connected with the belt wheel shaft through a bearing;

the damping structure, the damping structure with tensioning structure coaxial setting, and set up the rocking arm deviates from one side of tensioning structure.

As a further description of the above technical solution, a first notch is formed in a side wall of the spring housing, and one end of the volute spiral spring penetrates through the spring housing through the first notch and is clamped on the spring housing; the spring and the spring shell positioned on the other side of the first notch form a second notch, a dustproof plug is arranged in the second notch, and the dustproof plug is respectively and tightly abutted against the volute spiral spring and the spring shell.

As a further description of the above technical solution, a dust cover is further disposed on the first notch.

As a further description of the above technical solution, the damping structure includes a disk spring and a damping block, and the damping block is disposed on a side of the disk spring away from the rocker arm;

and a gasket is also arranged between the disc spring and the damping block.

As a further description of the above technical solution, an end cover is further disposed on one side of the damping block away from the rocker arm, and a gasket is further disposed between the end cover and the damping block.

As a further description of the above technical solution, the tensioning structure further includes a pad, and the pad is disposed between the rocker arm and the spring housing.

As a further description of the above technical solution, the tensioning structure further includes 2 sealing rings, and the sealing rings are respectively disposed at two ends of the pivot.

As a further description of the above technical solution, the pulley structure further includes 2 dust-proof plates and an axle bolt, wherein the dust-proof plates are respectively disposed at two ends of the bearing and fixed to the pulley axle through the axle bolt.

As a further description of the above technical solution, a second bushing is further disposed between the bearing and the shaft bolt.

As a further description of the above technical solution, the bearing is a deep groove ball bearing.

The utility model discloses an outstanding effect does:

in the high-reliability tensioning wheel provided by the utility model, the rocker arm is of a Z-shaped structure and comprises a vertical connecting plate and two spring shafts and belt pulley shafts which are reversely and horizontally arranged, the spring shafts and the belt pulley shafts are hollow shafts and are positioned on different height surfaces so as to correspondingly install the tensioning structures and the belt pulley structures, and the tensioning structures and the belt pulley structures are installed in a staggered manner, so that the transverse space is saved, the space structure is more compact, and the space layout requirement of an engine is met;

the utility model provides an in the take-up pulley that the reliability is high, one side that the rocking arm deviates from the tension structure still is equipped with provides suitable damped damping structure for tension structure, and its and the coaxial setting of tension structure. Wherein, the tensioning structure includes spring housing volute spiral spring and pivot, and the coaxial setting of three, and outside-in sets gradually, still overlaps on the pivot to be equipped with first bush, and volute spiral spring is inside to be equipped with the spring and separates the area, and the pivot is connected the back with spring axle riveting, and volute spiral spring is providing the moment in-process to the rocking arm, and the spring separates the area and can reduce the inside wearing and tearing of tensioning structure with the setting of first bush to the extension whole train system's life-span adopts volute spiral spring to have no influence to the depth of parallelism of take-up pulley, has also guaranteed tensile stability. The belt wheel structure comprises a belt wheel, the belt wheel is connected with a belt wheel shaft through a bearing, after the rocker arm obtains torque, the torque is transmitted to the belt wheel through the belt wheel shaft, the belt wheel synchronously generates tension force on a belt connected with the pulley wheel, and therefore the stability of the integral operation of the engine is ensured,

drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is an exploded view of a tension pulley with high reliability;

FIG. 2 is a cross-sectional view of a tension wheel with high reliability;

fig. 3 is the external structure schematic diagram of the tensioning wheel with high medium reliability of the present invention.

Reference numerals:

1-a rocker arm; 21-a spring housing; 22-a volute spiral spring; 23-a pivot; 24-spring spacer tape; 25-a first bushing; 26-a liner; 27-a sealing ring; 31-a pulley; 32-a bearing; 33-dust guard; 34-axle bolt; 35-a second bushing; 41-belleville springs; 42-a damping mass; 43-a gasket; 44-end cap; 45-washers; 51-dust plug; 52-dust cover.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "middle", "lower", "inner", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The following describes an embodiment of the present invention with reference to the overall structure thereof.

Referring to fig. 1 to 3, an embodiment of the present invention discloses a highly reliable tensioner, including:

the rocker arm 1 is Z-shaped and comprises a vertical connecting plate, two spring shafts and a belt wheel shaft, wherein the two spring shafts are arranged horizontally in an opposite direction; the spring shaft and the pulley shaft are hollow shafts;

the tensioning structure is arranged on the spring shaft and comprises a spring shell 21, a scroll spring 22 and a pivot shaft 23, the spring shell 21, the scroll spring 22 and the pivot shaft 23 are coaxially arranged, the scroll spring 22 is arranged in the spring shell 21, and the pivot shaft 23 penetrates through the scroll spring 22 and is in riveted connection with the spring shaft; a spring isolation belt 24 is arranged in the scroll spring 22, and a first bush 25 is sleeved on the pivot shaft 23;

a pulley structure mounted on the pulley shaft, comprising a pulley 31, the pulley 31 being connected to the pulley shaft by a bearing 32;

the damping structure is coaxial with the tensioning structure and is arranged on one side, deviating from the tensioning structure, of the rocker arm 1.

In the above arrangement mode, the high-reliability tensioning wheel comprises a rocker arm 1, the rocker arm 1 is of a Z-shaped structure and comprises a vertical connecting plate, two spring shafts and two belt wheel shafts which are reversely and horizontally arranged, the spring shafts and the belt wheel shafts are hollow shafts and are located on different height surfaces so as to be correspondingly mounted with the tensioning structure and the belt wheel structures, and the tensioning structure and the belt wheel structures are mounted in a staggered mode, so that a transverse space is saved, the space structure is more compact, and the space layout requirement of an engine is met. One side of the rocker arm 1, which deviates from the tensioning structure, is also provided with a damping structure which provides proper damping for the tensioning structure, and the damping structure and the tensioning structure are coaxially arranged to provide proper damping for a system. The tensioning structure comprises a spring shell 21, a volute spring 22 and a pivot shaft 23, the volute spring 21, the volute spring 22 and the pivot shaft 23 are coaxially arranged and sequentially arranged from outside to inside, a first bushing 25 is further sleeved on the pivot shaft 23, a spring spacer belt 24 is arranged inside the volute spring 22, after the pivot shaft 23 is connected with the spring shaft in a riveting mode, the volute spring 22 can reduce abrasion inside the tensioning structure in the process of providing torque for the rocker arm 1, the spring spacer belt 24 and the first bushing 25 are arranged, accordingly, the service life of the overall wheel train system is prolonged, the volute spring 22 does not affect the parallelism of the tensioning wheel, and the stability of tension is guaranteed. The belt wheel structure comprises a belt wheel 31, the belt wheel 31 is connected with the belt wheel shaft through a bearing 32, after the rocker arm 1 obtains torque, the torque is transmitted to the belt wheel 31 through a belt wheel shaft, and the belt wheel 31 synchronously generates tension on a belt connected with the pulley wheel, so that the stability of the whole operation of the engine is ensured.

Referring to fig. 1 and 2, in this embodiment, the rocker arm 1 is a Z-shaped structure, the spring shaft is defined to be disposed on the right side surface of the rocker arm 1, the pulley shaft is disposed on the left side surface of the rocker arm 1, the spiral spring 22 is riveted to the spring shaft through the pivot 23, and the spiral spring 22 is isolated from each circle by the spring isolation belt 24, so that the spiral spring 22 does not generate abnormal wear due to direct contact friction of metal during operation, and the effective service life is prolonged. Before the pivot 23 is riveted to the spring shaft through the central axis of the scroll spring 22 in the width direction, a first bushing 25 is sleeved on the pivot 23 to prevent sliding friction between the scroll spring 22 and the pivot 23, and the first bushing 25 may be a steel bushing with a teflon coating coated on the surface thereof to reduce the friction coefficient, increase wear resistance and realize self-lubrication, so that the scroll spring 22 stably slides on the pivot 23 to provide torque.

Specifically, in the present embodiment, after the pivot shaft 23 is riveted to the spring shaft, the left edge of the spring housing 21 is also abutted against the right side surface of the rocker arm 1, and a gasket 26 is disposed therebetween, so that the rocker arm 1 and the spring housing 21 can rotate relatively under a certain pressure and maintain a certain damping.

Referring to fig. 1 and fig. 3, in particular, in the present embodiment, a first notch is disposed on a side wall of the spring housing 21, and one end of the spiral spring 22 penetrates through the spring housing 21 through the first notch and is clamped on the spring housing 21, that is, one end of the spiral spring 22 penetrating through the spring housing 21 is in a hook shape; correspondingly, a dust cover 52 is arranged on the first notch; the volute spiral spring 22 and the spring shell 21 on the other side of the first gap form a second gap, a dust plug 51 is arranged in the second gap, and the dust plug 51 is tightly abutted to the volute spiral spring 22 and the spring shell 21 respectively. Due to the double sealing of the dustproof plug 51 and the dustproof cover 52, dust and sand are prevented from entering the spring shell 21 from two gap positions to pollute and damage the volute spiral spring 22 and other sub-parts, and the effective service life of the tensioning structure is ensured.

With reference to fig. 1 and fig. 2, in particular, in the present embodiment, two ends of the pivot 23 are further provided with sealing rings 27, so as to prevent dust from entering the areas of the pivot 23 and the first bushing 25 axially, thereby ensuring the wear resistance of the first bushing 25 and the service life of the tensioning structure.

Specifically, in this embodiment, the damping structure is installed at the left end of the spring shaft, and the end cover 44, the gasket 45, the damping block 42, the gasket 43 and the belleville spring 41 are sequentially arranged from left to right, wherein, when the tensioning structure works, the belleville spring 41 can generate an axial positive pressure on the damping block 42, so that the abrasion displacement of the damping block 42 is compensated, and thus the overall damping of the product is ensured. When the pivot shaft 23 is riveted into the spring shaft, the pivot shaft 23 is respectively assembled with the spring housing 21 and the end cover 44 in an interference fit manner, so that the requirement of parallelism between the tension pulley assembly and the mounting surface is met, and the pivot shaft 23 is also made of steel material for ensuring mechanical strength.

The belt wheel structure further comprises 2 dust-proof plates 33 and shaft bolts 34, wherein the dust-proof plates 33 are respectively arranged at the left end and the right end of the bearing 32 and fixed on the belt wheel shaft through the shaft bolts 34, and due to the labyrinth design of the double dust-proof plates 33, dust is prevented from entering a sealing area of the bearing 32 to the maximum extent, and the influence on the bearing 32 is avoided.

In this embodiment, the bearing 32 is a set of deep groove ball bearings, and a second bushing 35 is further disposed between the bearing 32 and the axle bolt 34, so as to ensure uniform play between the bearings 32, and thus ensure the service life of the bearing 32.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments of the invention without departing from the spirit and scope of the invention.

Claims

1. A highly reliable tension pulley, comprising:

the tensioning structure is arranged on the spring shaft and comprises a spring shell, a volute spiral spring and a pivot shaft, the spring shell, the volute spiral spring and the pivot shaft are coaxially arranged, the volute spiral spring is arranged in the spring shell, and the pivot shaft penetrates through the volute spiral spring and is in riveted connection with the spring shaft; a spring separation belt is arranged inside the volute spiral spring, and a first bushing is sleeved on the pivot;

2. The tension pulley with high reliability according to claim 1, wherein a first notch is arranged on a side wall of the spring housing, and one end of the spiral spring passes through the spring housing through the first notch and is clamped on the spring housing; the spring and the spring shell positioned on the other side of the first notch form a second notch, a dustproof plug is arranged in the second notch, and the dustproof plug is respectively and tightly abutted against the volute spiral spring and the spring shell.

3. The high reliability tensioner according to claim 2, wherein a dust cap is further disposed on the first notch.

4. The high-reliability tensioning wheel according to claim 1, wherein the damping structure comprises a disc spring and a damping block, and the damping block is arranged on one side, away from the rocker arm, of the disc spring;

and a gasket is also arranged between the disc spring and the damping block.

5. The high-reliability tensioning wheel according to claim 4, wherein an end cover is further arranged on one side of the damping block, which is far away from the rocker arm, and a gasket is further arranged between the end cover and the damping block.

6. The highly reliable tensioner according to claim 1, further comprising a pad provided between said rocker arm and said spring housing.

7. A highly reliable tensioner according to claim 1, characterised in that said tensioner further comprises 2 sealing rings, said sealing rings being provided at each end of said pivot.

8. The highly reliable tension pulley according to claim 1, wherein the pulley structure further comprises 2 dust-proof plates and an axle bolt, the dust-proof plates being respectively provided at both ends of the bearing and being fixed to the pulley axle by the axle bolt.

9. The highly reliable tensioner according to claim 8, wherein a second bushing is further provided between the bearing and the shaft bolt.

10. The highly reliable tensioner according to claim 1, wherein said bearing is a deep groove ball bearing.