Tensioning wheel with double-spring and double-damping-block type damping mechanism

Abstract

The utility model discloses a tensioning wheel with a double-spring and double-damping-block type damping mechanism, and relates to the technical field of tensioning wheels. The tensioning wheel comprises a damping mechanism, a tensioning arm, a belt wheel, a center shaft and a shell, the damping mechanism comprises two damping blocks and two springs, the two springs are arranged on the center shaft in a sleeving mode, the first damping block abuts against the inner side of the shell in the radial direction through the first spring, and the second damping block abuts against the inner side of the shell in the radial direction through the second spring. The two blocking parts abut against the damping blocks in the circumferential direction respectively. According to the tensioning wheel with the double-spring and double-damping-block type damping mechanism, the double-spring and double-damping-block type damping mechanism is adopted, so that damping force between the damping blocks and the tensioning wheel shell is multiplied, and the upper limit of the anti-vibration performance of the tensioning wheel is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of tension pulley, especially to a tension pulley with double-spring double-damping-block type damping mechanism. BACKGROUND

[0002] The tension pulley is a follow-up wheel pressed on the belt to change the wrap angle of the belt pulley or control the tension of the belt, and is a tension device of the belt drive. In actual use, the tension pulley needs a certain torque (i.e. pressing the belt) to maintain proper belt tension, avoid belt slip, and compensate for the elongation caused by belt wear and aging. However, when the belt moves, the speed change of the belt itself and the force acting on the tension pulley in the opposite direction when the belt moves are likely to cause the tension pulley to vibrate, leading to premature wear of the belt and the tension pulley.

[0003] Therefore, the prior art adds a damping mechanism to the tension pulley to suppress the vibration of the tension pulley.

[0004] However, the existing damping mechanism is usually a single spring + single damping block structure, and the friction between the tension pulley housing and the damping member depends only on the force of one spring and the friction coefficient between one damping block and the tension pulley housing. The damping level is relatively low, so it is easy to lose damping effect in a severe vibration working environment and cannot meet the use requirement of suppressing the vibration of the tension pulley in extreme use environment. SUMMARY

[0005] To improve the above technical defects in the prior art, the utility model provides a tension pulley with a double-spring double-damping-block type damping mechanism, which uses a double-spring double-damping-block type damping mechanism to multiply the damping force between the damping block and the tension pulley housing, and improve the upper limit of the vibration resistance performance of the tension pulley.

[0006] The technical solution to solve the above problems is to provide a tension pulley with a double-spring double-damping-block type damping mechanism, which includes a damping mechanism, a tension arm, a belt pulley, a center shaft, and a housing. The belt pulley is arranged at one end of the tension arm, the center shaft is rotatably arranged at the other end of the tension arm, the other end of the tension arm is also provided with two blocking parts, the housing is arranged at the other end of the tension arm, and the housing is fixedly connected with the center shaft. The damping mechanism includes two damping blocks and two springs. The two springs are sleeved on the center shaft, the first spring radially abuts the first damping block against the inner side of the housing, the second spring radially abuts the second damping block against the inner side of the housing, and the two blocking parts are respectively abutted on one damping block in the circumferential direction.

[0007] Further, the two blocking parts, the two damping blocks, and the two springs are respectively arranged symmetrically around the center shaft.

[0008] Further, the damping block is provided with a first limiting slot, the lower end of the spring is provided with an extension part, the extension part is clamped in the first limiting slot, and the spring is in a compressed and tightened state when abutting against the damping block.

[0009] Further, the damping block comprises an inner abutting part and an outer spacing part, the first limiting slot is arranged on the inner abutting part, and a clamping protrusion is arranged in the first limiting slot and used for clamping and limiting the extension part.

[0010] Further, the outer spacing part is arranged outside the inner abutting part, and the outer side surface of the outer spacing part is a rough surface.

[0011] Further, a plurality of second limiting slots are equidistantly arranged on the outer side wall of the inner abutting part, and a limiting clamping strip matched with the second limiting slots is protruded on the inner wall of the outer spacing part.

[0012] Further, the outer spacing part is made of wear-resistant rubber.

[0013] Further, the clamping protrusion is arranged in the middle of the first limiting slot and on the side slot wall of the first limiting slot.

[0014] Further, the two springs are cross-wound.

[0015] Further, a protection shaft sleeve is further arranged between the central shaft and the tensioning arm.

[0016] The beneficial effects of the damping mechanism of the tensioning wheel are as follows:

[0017] The damping mechanism of the tensioning wheel adopts a double-spring double-damping-block structure, two springs each abut a damping block against the inner wall of the shell, so that the two damping blocks each block each other with a blocking part, to effectively limit the swing of the tensioning arm, and further suppress the overall vibration of the tensioning wheel, and improve the limit vibration resistance performance of the tensioning wheel. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings incorporated into and forming a part of the specification illustrate embodiments of the present application and, together with the description, serve to explain the principles of the application. In the drawings, like reference numerals are used to represent similar elements. The drawings in the following description are some embodiments of the present application, not all embodiments. For those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0019] Figure 1 It is the overall structure of the tensioning wheel of the present embodiment.

[0020] Figure 2 is an overall structure exploded view of the tensioner wheel of the present embodiment;

[0021] Figure 3 is a structure view of the damping mechanism of the present embodiment;

[0022] Figure 4 is a structure view of the cooperation between a spring and a damping block of the present embodiment;

[0023] Figure 5 is a structure view of the damping block of the present embodiment;

[0024] Figure 6 is a structure view of the spring of the present embodiment;

[0025] 1-damping mechanism, 11-damping block, 12-spring, 13-first limiting slot, 14-extension, 15-clamping protrusion;

[0026] 111-inner abutting portion, 112-outer spacing portion;

[0027] 2-tensioning arm, 21-blocking portion, 3-pulley, 4-center shaft, 5-housing, 6-protective sleeve. DETAILED DESCRIPTION

[0028] In the present specification, the orientation terms such as up, down, left, right, front, back, front face, back face, top, bottom, etc. mentioned or possibly mentioned are defined relative to the configuration shown in the drawings, and the words "inner" and "outer" respectively refer to the direction towards or away from the geometric center of a particular component, which are relative concepts, and thus can change accordingly according to different positions, different use states. Therefore, these or other orientation terms should not be interpreted as restrictive terms.

[0029] Please refer to Figures 1 to 6 , refer to Figure 1The utility model discloses a kind of tensioning wheels with double-spring double-damping block type damping mechanism of the specific embodiments of the utility model, including damping mechanism 1, tensioning arm 2, pulley 3, central shaft 4, shell 5, pulley 3 rotatably installed at the right end of tensioning arm 2, central shaft 4 rotatably installed at the left end of tensioning arm 2, shell 5 covers and sets in the left end of tensioning arm 2, shell 5 is fixedly connected with central shaft 4 at the upper end of central shaft 4, damping mechanism 1 is arranged between central shaft 4 and the inner wall of shell 5, the left end of tensioning arm 2 is equipped with blocking part 21, blocking part 21 and damping mechanism 1 are mutually blocked and abut, damping mechanism 1 exerts frictional resistance on the inner wall of shell 5, when tensioning arm 2 has the tendency of rotation around central shaft 4, the frictional resistance is used to make damping mechanism 1 form movement block to blocking part 21, further limit the movement of tensioning arm 2 and the pulley 3 of its left end, to finally inhibit tensioning wheel is guided vibration by belt.

[0030] Specifically, please refer to Figure 2 、 Figure 3 、 Figure 4 , refer to Figure 2 The damping mechanism 1 includes two damping blocks 11 and two springs 12 in the embodiment, the two springs 12 are cross-wound and are both sleeved on the central shaft 4, the lower ends of the two springs 12 are both provided with extension parts 14, the two damping blocks 11 are both arc-shaped thick bases, the two damping blocks 11 are both arranged between the central shaft 4 and the inner wall of the shell 5, the two damping blocks 11 are both provided with first limiting grooves 13 upward, the extension parts 14 of the lower ends of the two springs 12 respectively extend into one first limiting groove 13, and the two extension parts 14 are both elastically compressed and tightened to the center direction of the spring 12 when being arranged into the first limiting groove 13; in addition, the two blocking parts 21 are symmetrically arranged around the central shaft 4, and the two blocking parts 21 are respectively abutted on one damping block 11 in the circumferential direction.

[0031] In this way, the elastic force of the spring 12 itself due to the elastic relaxation tendency acts on the damping block 11, and the two springs 12 respectively abut one damping block 11 on the inner wall of the shell 5, so that the frictional resistance is generated between the damping block 11 and the inner wall of the shell 5.

[0032] In this way, when the tensioning arm 2 has the tendency to swing under the influence of the belt, the swing tendency of the tensioning arm 2 around the central shaft 4 acts on the two blocking parts 21, and the two blocking parts 21 are blocked by one damping block 11 due to the existence of the frictional resistance, so that the damping mechanism 1 can effectively inhibit the swing of the tensioning arm 2, and further inhibit the vibration of the entire tensioning wheel.

[0033] It should be noted that: in the embodiment, two springs 12 are arranged in the damping mechanism 1, and the resistance generated by the damping mechanism 1 can be doubled, which can effectively improve the limit anti-vibration performance of the tensioning wheel.

[0034] Further, please refer to Figure 4 , Figure 5 , Figure 6 In this embodiment, in order to prevent the elongated portion 14 of the lower end of the spring 12 from being detached from the first limiting groove 13 in the circumferential direction, the first limiting groove 13 is provided as an arc-shaped groove, and a clamping protrusion 15 is formed on the outer arc-shaped groove wall of the first limiting groove 13, which is arranged at the middle position of the first limiting groove 13.

[0035] In this regard, the groove width of the limiting groove at the position of the clamping protrusion 15 is further narrowed due to the presence of the clamping protrusion 15, so as to effectively clamp the elongated portion 14 of the lower end of the spring 12; and the elastic force effect of the elongated portion 14 can also be uniformly transmitted from the clamping protrusion 15 to both ends of the damping block 11, so that the outer wall of the damping block 11 can be uniformly and stably fitted with the inner wall of the shell 5, so as to as far as possible to improve the frictional resistance between the damping block 11 and the shell 5.

[0036] Further, in actual use, the damping mechanism 1 will basically encounter the situation that the relative movement of the shell 5 occurs due to the external vibration load exceeding the damping force of the damping mechanism 1, and in this case, in order to reduce the wear of the damping block 11, please refer to Figures 2 to 5 In this embodiment, the damping block 11 comprises an inner abutting portion 111 and an outer spacing portion 112, the inner abutting portion 111 is made of metal material, and the outer spacing portion 112 is a separation layer completely spaced between the inner abutting portion 111 and the shell 5, which is made of wear-resistant rubber.

[0037] Further, the outer wall of the outer spacing portion 112 is further provided as a rough surface to further improve the frictional resistance.

[0038] In addition, the arc-shaped outer wall of the inner abutting portion 111 is uniformly provided with a plurality of second limiting grooves, and the inner surface of the outer spacing portion 112 is correspondingly provided with a plurality of limiting clamping strips, which are correspondingly inserted into the second limiting grooves, so that the outer spacing portion 112 and the inner abutting portion 111 are clamped and limited to each other, preventing the relative sliding between the inner abutting portion 111 and the outer spacing portion 112, which affects the normal work of the damping mechanism 1.

[0039] In addition, in this embodiment, since the tensioning arm 2 can initially swing in a small range, and when the external load accidentally exceeds the load limit of the damping mechanism 1, the tensioning arm 2 will also swing, and in order to avoid the sliding friction between the tensioning arm 2 and the central shaft 4 when the tensioning arm 2 swings, causing wear, a protective shaft sleeve 6 is further arranged between the central shaft 4 and the tensioning arm 2.

[0040] The above-mentioned matters not mentioned are applicable to the prior art.

[0041] It should be finally pointed out that: the above examples are only used to illustrate the technical solutions of the utility model, and not limit it. Although the utility model has been explained in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A tensioning wheel with double-spring double-damping-block type damping mechanism, the tensioning wheel comprising a damping mechanism (1), a tensioning arm (2), a pulley (3), a central shaft (4), and a shell (5), the pulley (3) being arranged at one end of the tensioning arm (2), the central shaft (4) being rotatably arranged at the other end of the tensioning arm (2), the other end of the tensioning arm (2) further being provided with two blocking portions (21), the shell (5) being arranged on the other end of the tensioning arm (2), and the shell (5) being fixedly connected with the central shaft (4), characterized in that, The damping mechanism (1) comprises two damping blocks (11) and two springs (12), both of the springs (12) are sleeved on the central shaft (4), the first spring (12) radially abuts the first damping block (11) to the inner side of the shell (5), the second spring (12) radially abuts the second damping block (11) to the inner side of the shell (5), and the two blocking parts (21) are circumferentially abutted to one damping block (11).

2. The tensioner of claim 1, wherein, The two blocking parts (21), the two damping blocks (11) and the two springs (12) are symmetrically arranged around the central shaft (4).

3. The tensioner of claim 1, wherein, The damping block (11) is provided with a first limiting groove (13), the lower end of the spring (12) is provided with an extension part (14), the extension part (14) is clamped in the first limiting groove (13), and the spring (12) is in a compressed and tightened state when abutting to the damping block (11).

4. The tensioner of claim 3, wherein, The damping block (11) comprises an inner abutting part (111) and an outer spacing part (112), the first limiting groove (13) is arranged on the inner abutting part (111), the first limiting groove (13) is provided with a clamping protrusion (15), and the clamping protrusion (15) is used for clamping and limiting the extension part (14).

5. The tensioner of claim 4, wherein, The outer spacing part (112) is arranged outside the inner abutting part (111), and the outer surface of the outer spacing part (112) is a rough surface.

6. The tensioner of claim 4, wherein, A plurality of second limiting grooves are equidistantly arranged on the outer side wall of the inner abutting part (111), and a limiting clamping strip matched with the second limiting groove is protruded on the inner wall of the outer spacing part (112).

7. The tensioner of claim 4, wherein, The outer spacing part (112) is made of wear-resistant rubber.

8. The tensioner of claim 4, wherein, The clamping protrusion (15) is arranged in the middle of the first limiting groove (13) and on the side groove wall of the first limiting groove (13).

9. The tensioner of claim 1, wherein, The two springs (12) are cross-wound.

10. The tensioner of claim 1, wherein, The central shaft (4) and the tensioning arm (2) are further provided with a protective shaft sleeve (6).

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