Novel durable tensioner

Abstract

The novel durable tensioner is composed of a center shaft, a fixing plate, a tensioning arm, a torsion spring, a wheel body, an outer bearing and a connecting plate, the center shaft axially extends in the vertical direction and is fixedly installed on the fixing plate, the tensioning arm is eccentrically connected to the center shaft, the wheel body is sleeved with the tensioning arm in the circumferential direction, the outer bearing is located between the tensioning arm and the wheel body, and the torsion spring is arranged on the outer bearing. The connecting plate is located above the center shaft and connected with the tensioning arm through the torsion spring, the torsion spring is arranged on the tensioning arm in a sleeving mode and comprises an upper supporting foot and a lower supporting foot, the connecting plate is provided with a limiting check block, the tensioning arm is provided with a positioning groove, one end of the upper supporting foot abuts against the limiting check block, the lower supporting foot is located in the positioning groove, and the limiting check block abuts against the lower supporting foot. And the section of the torsional spring is rectangular. By the adoption of the scheme, the durability of the novel durable tensioner is improved by changing the section of the torsional spring.

Description

Technical Field

[0001] The utility model relates to the field of tensioners, in particular to a novel durable tensioner. Background Art

[0002] The working principle of the tensioner is to automatically or manually maintain the proper tension of transmission components such as belts, chains, synchronous belts, chains, etc. in various transmission systems to ensure efficient power transmission and prevent slipping or tooth jumping.

[0003] The existing tensioner usually has a torsion spring between the connecting plate and the tensioning arm so that the torsion spring can adjust the tensioning state of the belt by compressing or resetting the belt. However, the existing torsion spring has a circular cross-section, and has a small contact area when used after assembly. It cannot disperse the pressure well, resulting in reduced durability or premature failure.

[0004] Therefore, how to improve the service life of the spring has become a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of the deficiencies in the prior art, the utility model aims to provide a novel durable tensioner which improves the durability of the torsion spring by changing the cross section of the torsion spring.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solution: it is composed of a central shaft, a fixed plate, a tensioning arm, a torsion spring, a wheel body, an outer bearing and a connecting plate, the central shaft extending axially in the up and down directions and fixedly installed on the fixed plate, the tensioning arm is eccentrically connected to the central shaft and circumferentially sleeved with the wheel body, the outer bearing is located between the tensioning arm and the wheel body, the connecting plate is located above the central shaft and connected to the tensioning arm through a torsion spring, the torsion spring is sleeved around the tensioning arm and includes an upper support leg and a lower support leg, the connecting plate is provided with a limited stop block, the tensioning arm is provided with a positioning groove, one end of the upper support leg is against the limited stop block, the lower support leg is located in the positioning groove, and the cross-section of the torsion spring is rectangular.

[0007] The utility model is further configured to include a self-lubricating bearing located between the central shaft and the tensioning arm.

[0008] The utility model is further configured as follows: it also includes an upper wear-reducing plate and a lower wear-reducing plate, the lower wear-reducing plate is located above the fixed plate and is sleeved on the circumference of the central axis, the self-lubricating bearing and the bottom of the tensioning arm are both against the lower wear-reducing plate, the tensioning arm includes a positioning section at the top, and the upper wear-reducing plate is sleeved on the circumference of the central axis and against the positioning section.

[0009] The utility model is further configured as follows: the central axis includes a first mounting section, a second mounting section, a third mounting section and a fourth mounting section from top to bottom, the upper wear-reducing plate, the lower wear-reducing plate and the self-lubricating bearing are all sleeved on the circumference of the third mounting section, the diameter of the fourth mounting section is smaller than that of the third mounting section, and the fixed plate is sleeved on the circumference of the fourth mounting section and abuts against the lower wear-reducing plate.

[0010] The utility model is further configured to include a disc spring, which is sleeved on the third installation section and has one end fixed to the second installation section and the other end fixed to the upper wear-reducing plate.

[0011] The utility model is further configured as follows: the connecting plate includes a limiting section at the bottom, the limiting section is sleeved on the circumference of the second mounting section, the diameter of the first mounting section is larger than the second mounting section, and the first mounting section abuts against the limiting section.

[0012] The utility model is further configured as follows: an upper support member and a lower support member are respectively provided on the upper and lower sides of the wheel body, the bottom surface of the upper support member is against the outer bearing, the top surface of the lower support member is against the outer bearing, the upper support member includes an upper guide surface, and the upper guide surface is inclined from top to bottom and from outside to inside, and the lower support member includes a lower guide surface, and the lower guide surface is inclined from top to bottom and from inside to outside.

[0013] By adopting the above technical scheme, since the cross-section of the torsion spring is changed from circular to rectangular, relative to the torsion spring with a circular cross-section, when subjected to force, the end face and contact area of ​​the rectangular torsion spring are increased, which is beneficial to load distribution, reduces local stress concentration, reduces point wear, and improves durability. The rectangular cross-section provides better lateral stability, resists bending and torsion, and the pressure applied to the torsion spring is more uniform; 2. Since one end of the upper leg of the torsion spring is against the limit stop of the connecting plate, and the lower leg is located in the positioning groove of the tensioning arm, the axial positions of the two ends of the torsion spring can be determined, so that the torsion spring can be stably located between the connecting plate and the tensioning arm; 3. The torsion spring with a rectangular cross-section can utilize space more effectively within the same volume, especially in a limited space layout, there is no waste compared to the circular shape, and the compactness is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is an assembly diagram of a specific implementation method of the utility model;

[0016] Figure 2 It is a cross-sectional view of a specific implementation mode of the utility model;

[0017] Figure 3 It is an exploded view of a specific implementation method of the utility model;

[0018] Figure 4 for Figure 2 A magnified view of middle;

[0019] Figure 5 for Figure 2 Enlarged view of middle B;

[0020] Figure 6 for Figure 2 Enlarged view of middle C;

[0021] Figure 7 for Figure 3 Enlarged view of D in the middle.

[0022] In the figure: 1-central axis, 11-first mounting section, 12-second mounting section, 13-third mounting section, 14-fourth mounting section, 15-self-lubricating bearing;

[0023] 2-Fixed plate;

[0024] 3-tensioning arm, 31-positioning slot, 32-positioning section;

[0025] 4-torsion spring, 41-upper support leg, 42-lower support leg;

[0026] 5-wheel body, 51-upper support member, 511-upper guide surface, 52-lower support member, 521-lower guide surface;

[0027] 6-External bearing;

[0028] 7-connecting plate, 71-limiting block, 72-limiting section;

[0029] 8-upper wear reducing plate;

[0030] 9-lower wear reducing plate;

[0031] 10- Disc spring. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] like Figure 1-Figure 7 As shown, the utility model discloses a novel durable tensioner, which is composed of a central shaft 1, a fixed plate 2, a tensioning arm 3, a torsion spring 4, a wheel body 5, an outer bearing 6 and a connecting plate 7. The central shaft 1 extends axially in the up-down direction and is fixedly installed on the fixed plate 2. The tensioning arm 3 is eccentrically connected to the central shaft 1 and is circumferentially sleeved with the wheel body 5. The outer bearing 6 is located between the tensioning arm 3 and the wheel body 5. The connecting plate 7 is located above the central shaft 1 and is connected to the tensioning arm 3 through the torsion spring 4. During the working process of the tensioner, the connecting plate 7 needs to be It is fixed at the installation position of the car so that the wheel body 5 is against the belt, and the central shaft 1 is connected with the connecting plate 7 and the fixing plate 2 by interference fit. Because the tensioning arm 3 is eccentrically arranged on the central shaft 1 and the torsion spring 4 is located between the connecting plate 7 and the tensioning arm 3, the tensioning arm 3 has a tendency to swing along the central shaft 1 under the action of the torsion spring 4 and drive the wheel body 5 to swing toward the belt, so that the wheel body 5 is always kept against the belt to achieve the tensioning of the belt. The torsion spring 4 is sleeved on the circumference of the tensioning arm 3 and includes an upper support leg 41 and a lower support leg 42. The connecting plate 7 is provided with a limited stopper 71, the tensioning arm 3 is provided with a positioning groove 31, one end of the upper support leg 41 is against the limited stopper 71, the lower support leg 42 is located in the positioning groove 31, and the cross section of the torsion spring 4 is set in a rectangular shape. 1. Since the cross section of the torsion spring 4 is changed from circular to rectangular, the contact area of ​​the end face of the rectangular torsion spring 4 is increased when subjected to force, which is beneficial to load distribution, reducing local stress concentration, reducing point wear, and improving durability. The rectangular cross section provides better 1. It has good lateral stability, resists bending and torsion, and the pressure applied to the torsion spring 4 is more uniform; 2. Since one end of the upper support leg 41 of the torsion spring 4 is against the limit stopper 71 of the connecting plate 7, and the lower support leg 42 is located in the positioning groove 31 of the tensioning arm 3, the axial positions of the two ends of the torsion spring 4 can be determined, so that the torsion spring 4 can be stably located between the connecting plate 7 and the tensioning arm 3; 3. The torsion spring 4 with a rectangular cross-section can utilize space more effectively within the same volume, especially in a limited space layout, there is no waste compared to the circular shape, and the compactness is improved.

[0034] It is worth noting that in the present embodiment, the cross section of the torsion spring 4 is rectangular, but during the design and production process, the cross section of the torsion spring 4 may also be square.

[0035] It also includes a self-lubricating bearing 15 located between the central shaft 1 and the tensioning arm 3. The self-lubricating bearing 15 reduces the friction between the central shaft 1 and the tensioning arm 3 and reduces the resistance between the two contact surfaces. In addition, since the self-lubricating bearing 15 does not require external lubricants, failures caused by poor lubrication are reduced, ensuring stable operation of the equipment, improving overall reliability, reducing friction and thereby reducing noise, and extending service life.

[0036] Among them, it also includes an upper wear-reducing plate 8 and a lower wear-reducing plate 9, the lower wear-reducing plate 9 is located above the fixed plate 2 and is sleeved on the circumference of the central axis 1, the self-lubricating bearing 15 and the bottom of the tensioning arm 3 are both against the lower wear-reducing plate 9, the tensioning arm 3 includes a positioning section 32 at the top, the upper wear-reducing plate 8 is sleeved on the circumference of the central axis 1 and is against the positioning section 32, because the upper wear-reducing plate 8 is sleeved on the central axis 1 and is against the positioning section 32, and the lower wear-reducing plate 9 is sleeved on the central axis 1 and is against the self-lubricating bearing 15 and the bottom of the tensioning arm 3, the upper wear-reducing plate 8 is located between the central axis 1 and the tensioning arm 3, and the lower wear-reducing plate 9 is located between the self-lubricating bearing 15, the tensioning arm 3 and the fixed plate 2, so the upper wear-reducing plate 8 and the lower wear-reducing plate 9 can reduce the wear of the above-mentioned parts, reduce contact friction, improve efficiency, and extend service life.

[0037] Preferably, the central shaft 1 includes, from top to bottom, a first mounting section 11, a second mounting section 12, a third mounting section 13 and a fourth mounting section 14, the upper wear reducing plate 8, the lower wear reducing plate 9 and the self-lubricating bearing 15 are all sleeved on the circumference of the third mounting section 13, the diameter of the fourth mounting section 14 is smaller than the third mounting section 13, the fixed plate 2 is sleeved on the circumference of the fourth mounting section 14" and abuts against the lower wear reducing plate 9, because the fixed plate 2 is sleeved on the circumference of the fourth mounting section 14 and the diameter of the third mounting section 13 is larger than the fourth mounting section 14, the existence of the fourth mounting section 14 makes it impossible for the fixed plate 2 to move upward, and the lower wear reducing plate 9 abuts against the self-lubricating bearing 15 and the tensioning arm 3, so the fixed plate 2 and the lower wear plate can axially limit the central shaft 1, and because the central shaft 1 is fixed to the wear plate, the central shaft 1 cannot move circumferentially, and the central shaft 1 can be stably located on the fixed plate 2.

[0038] It also includes a disc spring 10, which is sleeved on the third mounting section 13 and fixed to the second mounting section 12 at one end and the upper wear-reducing plate 8 at the other end. The disc spring 10 can provide buffering and shock absorption, so as to protect the central shaft 1 and the tensioning arm 3 from excessive instantaneous force during vehicle driving, and can provide continuous tensioning force to maintain the pressure and position between the central shaft 1 and the tensioning arm 3, ensuring stable assembly without loosening. In addition, the disc spring 10 is not easily deformed after multiple cycles and has a long service life.

[0039] Among them, the connecting plate 7 includes a limiting section 72 at the bottom, and the limiting section 72 is sleeved on the circumference of the second mounting section 12. The diameter of the first mounting section 11 is larger than that of the second mounting section 12 and the first mounting section 11 is against the limiting section 72. Since the limiting section 72 of the connecting plate 7 is sleeved on the second mounting section 12, and the diameter of the second mounting section 12 is smaller than the diameter of the first mounting section 11, after the limiting section 72 is installed on the second mounting section 12, the limiting section 72 cannot move axially upward on the center axis 1, and due to the presence of the disc spring 10 below, the position of the limiting section 72 on the center axis 1 can be limited, so that the connecting plate 7 will not move axially on the center axis 1 without the action of external force, thereby providing convenience for the subsequent fixing of the connecting plate 7 on other carriers such as automobiles.

[0040] The upper and lower sides of the wheel body 5 are respectively provided with an upper support member 51 and a lower support member 52, the bottom surface of the upper support member 51 is against the outer bearing 6, and the top surface of the lower support member 52 is against the outer bearing 6. The upper support member 51 includes an upper guide surface 511, and the upper guide surface 511 is inclined from top to bottom and from outside to inside. The lower support member 52 includes a lower guide surface 521, and the lower guide surface 521 is inclined from top to bottom and from inside to outside. 1. The upper support member 51 and the lower support member 52 can improve the wheel body 5 1. The strength makes the wheel body 5 not easily damaged by external forces during use; 2. Since the bottom surface of the upper support member 51 is in contact with the outer bearing 6, and the top surface of the lower support member 52 is in contact with the outer bearing 6, the outer bearing 6 is placed in the wheel body 5 and is affected by the upper support member 51 and the lower support member 52 without axial movement. In addition, the lower guide surface 521 of the lower support member 52 is inclined to save materials for the lower support member 52 during the production process. Similarly, the upper guide surface 511 can save material loss for the upper support member 51 during the production process.

[0041] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A novel durable tensioner, consisting of a central shaft, a fixed plate, a tensioning arm, a torsion spring, a wheel body, an outer bearing and a connecting plate, wherein the central shaft axially extends in the up-down direction and is fixedly mounted on the fixed plate, the tensioning arm is eccentrically connected to the central shaft and is circumferentially sleeved with a wheel body, the outer bearing is located between the tensioning arm and the wheel body, the connecting plate is located above the central shaft and is connected to the tensioning arm through a torsion spring, and is characterized in that: The torsion spring is sleeved on the circumference of the tensioning arm and includes an upper support leg and a lower support leg. The connecting plate is provided with a limit stop block. The tensioning arm is provided with a positioning groove. One end of the upper support leg is against the limit stop block. The lower support leg is located in the positioning groove. The cross-section of the torsion spring is rectangular.

2. A novel durable tensioner according to claim 1, characterized in that: Also included are self-lubricating bearings located between the center shaft and the tensioner arm.

3. A novel durable tensioner according to claim 2, characterized in that: It also includes an upper wear-reducing plate and a lower wear-reducing plate, wherein the lower wear-reducing plate is located above the fixed plate and is sleeved on the circumference of the central axis, the self-lubricating bearing and the bottom of the tensioning arm are both against the lower wear-reducing plate, the tensioning arm includes a positioning section at the top, and the upper wear-reducing plate is sleeved on the circumference of the central axis and is against the positioning section.

4. A novel durable tensioner according to claim 3, characterized in that: The central axis includes a first mounting section, a second mounting section, a third mounting section and a fourth mounting section from top to bottom, the upper wear reducing plate, the lower wear reducing plate and the self-lubricating bearing are all sleeved on the circumference of the third mounting section, the diameter of the fourth mounting section is smaller than that of the third mounting section, and the fixing plate is sleeved on the circumference of the fourth mounting section and abuts against the lower wear reducing plate.

5. The novel durable tensioner according to claim 3 is characterized in that: It also includes a disc spring, which is sleeved on the third installation section and has one end fixed to the second installation section and the other end fixed to the upper wear-reducing plate.

6. A novel durable tensioner according to claim 4, characterized in that: The connecting plate comprises a limiting section at the bottom, the limiting section is sleeved on the circumference of the second mounting section, the diameter of the first mounting section is larger than the second mounting section, and the first mounting section abuts against the limiting section.

7. The novel durable tensioner according to claim 1 is characterized in that: An upper support member and a lower support member are respectively provided on the upper and lower sides of the wheel body, the bottom surface of the upper support member abuts against the outer bearing, the top surface of the lower support member abuts against the outer bearing, the upper support member includes an upper guide surface, and the upper guide surface is inclined from top to bottom and from outside to inside, and the lower support member includes a lower guide surface, and the lower guide surface is inclined from top to bottom and from inside to outside.

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