A tensioner

Abstract

The utility model provides a tensioner, including a base, a cover plate, a main shaft, a tensioning arm, and a torsion spring. One end of the tensioning arm is connected to a pulley, and the other end of the tensioning arm is provided with a main shaft through hole. One end of the main shaft is connected to the base, and a first main shaft positioning hole is provided on the cover plate. The end of the main shaft away from the base is interference fit with the first main shaft positioning hole on the cover plate, and the main shaft passes through the main shaft through hole on the tensioning arm; a first spring end positioning surface is provided on the cover plate, and a second spring end positioning surface is provided on the tensioning arm; an axle hole is provided on the end of the tensioning arm away from the main shaft through hole, and a wheel axle is installed on the wheel axle hole, and the pulley is rotatably connected to the wheel axle. During the production and assembly process of the tensioner, the torque of the internal torsion spring can be adjusted according to actual needs, so that a spring can achieve different torque outputs and the tensioner has different tensioning effects, without changing the model and specification of the spring, reducing the pressure of parts supply during the production process.

Description

Technical Field

[0001] The utility model relates to the technical field of tensioning devices, in particular to a tensioner. Background Art

[0002] Tensioners are widely used in belt drive systems. In automotive accessory systems, constant belt tension is required. The function of a belt tensioner is to ensure that the transmission belt (such as a timing belt or an accessory belt) maintains proper tension to ensure stable operation of the system and improve transmission efficiency.

[0003] Among them, the existing mechanical tensioning device usually uses a spring as an elastic element and provides torque for the tensioning arm. Under the action of the torque, the pulley on the tensioning arm contacts the belt and tensions the belt.

[0004] In the actual production process, when the tensioning device is used in different types of equipment (such as engines), the tensioning device is required to have different tensioning effects, that is, the tensioning arm is required to have different torques; in the prior art, different types and specifications of springs are selected during the production process to enable the tensioner to have different tensioning effects, which results in a wide variety of spring types used in the production process, greatly increasing the pressure on parts supply during the production process. Summary of the invention

[0005] The utility model aims to solve the deficiencies in the prior art and provide a tensioner.

[0006] The purpose of the utility model is achieved through the following technical solutions: a tensioner, comprising a base, a cover plate, a main shaft, a tensioning arm, and a torsion spring, wherein one end of the tensioning arm is connected to a pulley, the other end of the tensioning arm is provided with a main shaft through hole, one end of the main shaft is connected to the base, a first main shaft positioning hole is provided on the cover plate, and the end of the main shaft away from the base is interference fit with the first main shaft positioning hole on the cover plate; the tensioning arm is located between the cover plate and the base, and the main shaft passes through the main shaft through hole on the tensioning arm; a first spring end positioning surface is provided on the cover plate, and a second spring end positioning surface is provided on the tensioning arm, one end of the torsion spring contacts with the first spring end positioning surface, and the other end of the torsion spring contacts with the second spring end positioning surface; an axle hole is provided on the end of the tensioning arm away from the main shaft through hole, an axle is mounted on the axle hole, and the pulley is rotatably connected to the axle.

[0007] Preferably, a limiting groove is provided on the base, and a limiting block is provided on the tensioning arm, and the limiting block is located in the limiting groove.

[0008] Preferably, an adjustment positioning hole is provided on a side of the cover plate away from the tensioning arm.

[0009] Preferably, a columnar body is provided on one side of the tensioning arm, a cavity is provided on the base, and the columnar body is connected to the cavity; a spring cavity is provided in the columnar body, the main shaft through hole is provided in the center of the spring cavity, and the second spring end positioning surface is provided at the bottom of the spring cavity; and the torsion spring is placed in the spring cavity.

[0010] Preferably, a friction-reducing ring is provided between the outer side of the columnar body and the inner side wall of the cavity on the base, and a bushing is provided in the main shaft through hole.

[0011] Preferably, a damping plate is provided between the columnar body and the bottom of the cavity.

[0012] Preferably, a first helical lead angle surface is provided on one side of the cover plate close to the positioning surface of the first spring end, and the helical lead angle of the first helical lead angle surface is consistent with the helical lead angle of the torsion spring; a second helical lead angle surface is provided at the bottom of the spring cavity, and the helical lead angle of the second helical lead angle surface is consistent with the helical lead angle of the torsion spring.

[0013] Preferably, a dust cover is provided on one side of the pulley.

[0014] The beneficial effect of the utility model is that in the utility model, during the production and assembly process of the tensioner, the torque of the internal torsion spring can be adjusted according to actual needs, so that one spring can achieve different torque outputs and the tensioner has different tensioning effects, without the need to replace the model and specifications of the spring, thereby reducing the pressure on parts supply during the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of one direction of the utility model.

[0016] Figure 2 It is a structural schematic diagram of another direction of the utility model.

[0017] Figure 3 It is an exploded view of the utility model.

[0018] Figure 4 It is a top view of the utility model.

[0019] Figure 5 for Figure 4 Cross-sectional view along the AA direction.

[0020] Figure 6 This is a schematic diagram of the structure of the cover in one direction.

[0021] Figure 7 This is a schematic diagram of the structure of the cover in another direction.

[0022] Figure 8 This is a schematic diagram of the structure of the tensioning arm in one direction.

[0023] Fig. 9 This is a schematic diagram of the structure of the tensioning arm in another direction.

[0024] Fig.10 Schematic diagram of the structure of the torsion spring.

[0025] Fig.11 A schematic diagram of the structure of the base.

[0026] Fig.12 A schematic diagram of the main axis structure.

[0027] Fig.13 This is a schematic diagram for adjusting the use of the press-fitting equipment.

[0028] In the figure: 1, cover plate, 101, first spiral rise angle surface, 102, first spring end positioning surface, 103, adjustment positioning hole, 104, first spindle positioning hole, 2, spindle, 201, first connecting end, 202, second connecting end, 203, mounting hole, 3, torsion spring, 301, first connecting end, 302, second connecting end, 4, tensioning arm, 401, second spiral rise angle surface, 402, second spring end positioning surface, 40 3. Spindle through hole, 404, limit block, 405, columnar body, 5. bushing, 6. friction reducing ring, 7. damping plate, 8. base, 801, second spindle positioning hole, 802, limit groove, 9, axle, 10, dust cover, 11, pulley, 12, bearing, 13, positioning seat, 14, lifting drive device, 15, top pressure sleeve, 16, mounting plate, 17, motor, 18, torque sensor, 19, turntable, 20, boss. DETAILED DESCRIPTION

[0029] 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 belong to the scope of protection of the utility model.

[0030] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0031] like Figure 1-13As shown, a tensioner comprises a base 8, a cover plate 1, a main shaft 2, a tensioning arm 4, and a torsion spring 3, one end of the tensioning arm 4 is connected to a pulley 11, the other end of the tensioning arm 4 is provided with a main shaft through hole 403, one end of the main shaft 2 is connected to the base 8, a first main shaft positioning hole 104 is provided on the cover plate 1, and the end of the main shaft 2 away from the base 8 is interference fit with the first main shaft positioning hole 104 on the cover plate 1; the tensioning arm 4 is located between the cover plate 1 and the base 8, and the main shaft 2 passes through the main shaft through hole 403 on the tensioning arm 4; a first spring end positioning surface 102 is provided on the cover plate 1, and a second spring end positioning surface 402 is provided on the tensioning arm 4, one end of the torsion spring 3 contacts with the first spring end positioning surface 102, and the other end of the torsion spring 3 contacts with the second spring end positioning surface 402; a limiting groove 802 is provided on the base 8, and a limiting block 404 is provided on the tensioning arm 4, and the limiting block 404 is located in the limiting groove 802.

[0032] The cover plate 1 is a circular plate-shaped structure. A columnar body 405 is provided on one side of the tensioning arm 4, and the columnar body 405 is cylindrical in shape. A cavity is provided on the base 8, and the cavity is a cylindrical cavity, and the cavity matches the columnar body 405. The columnar body 405 is connected to the cavity. A spring cavity is provided in the columnar body 405, and the spring cavity is a circular cavity. The main shaft through hole 403 is arranged at the center of the spring cavity, and the second spring end positioning surface 402 is arranged at the bottom of the spring cavity; the torsion spring 3 is placed in the spring cavity.

[0033] In the utility model, the two ends of the torsion spring 3 are respectively in contact with the cover plate 1 and the tensioning arm 4. After the tensioner is assembled, the two ends of the main shaft 2 are respectively connected to the cover plate 1 and the base 8, so that the main shaft 2, the cover plate 1 and the base 8 are an integral part; when the tensioner is in use, the base 8 is fixed on the equipment (such as the engine), and the base 8 and the engine remain relatively still; the torsion spring 3 applies torque to the tensioning arm 4, so that the belt is tensioned through the pulley 11. The rotation angle of the tensioning arm 4 can be limited by the cooperation between the limit block 404 and the limit groove 802. When assembling the tensioner, first fix one end of the main shaft 2 to the base 8, put the damping plate 7 into the cavity on the base 8, put the friction-reducing ring 6 onto the outside of the columnar body 405 on the tensioning arm 4, install the columnar body 405 on the tensioning arm 4 into the cavity on the base 8, and make the limit block 404 on the tensioning arm 4 fall into the limit groove 802 on the base 8; then install the torsion spring 3 and the cover plate 1 on the tensioning arm 4, one end of the torsion spring 3 contacts the second spring end positioning surface 402 on the tensioning arm 4, and the other end of the torsion spring 3 contacts the cover plate 1. 1, and the spindle 2 is aligned with the first spindle positioning hole 104 on the cover plate 1; finally, the cover plate 1 is rotated, and the cover plate 1 drives one end of the torsion spring 3 to twist during rotation, thereby adjusting the torque of the torsion spring 3. When the torque of the torsion spring 3 reaches the required torque value, the rotation of the cover plate 1 is stopped, and then a top pressure is applied to the cover plate 1 to press the cover plate 1 onto one end of the spindle 2, and the cover plate 1 is fixed on the spindle 2 through the interference fit between the spindle 2 and the first spindle positioning hole 104 on the cover plate 1. In the above manner, the torque of the internal torsion spring 3 can be adjusted according to actual needs during the production and assembly process of the tensioner, so that one spring can achieve different torque outputs and the tensioner has different tensioning effects, without the need to change the model and specifications of the spring, thereby reducing the pressure on parts supply during the production process.

[0034] The two ends of the spindle 2 are respectively provided with a first connection end 201 and a second connection end 202, the first connection end 201 is interference fit with the first spindle positioning hole 104 on the cover plate 1, and the second connection end 202 is connected to the base 8. The base 8 is provided with a second spindle positioning hole 801 for connecting the second connection end 202, and the second connection end 202 is interference fit with the second spindle positioning hole 801.

[0035] A mounting hole 203 is provided at one end of the main shaft 2 close to the cover plate 1, and the main shaft 2 can be connected to the mounted device (such as an engine) by bolts through the through hole.

[0036] A first helical angle surface 101 is provided on one side of the cover plate 1 close to the first spring end positioning surface 102, and the helical angle of the first helical angle surface 101 is consistent with the helical angle of the torsion spring 3. A second helical angle surface 401 is provided at the bottom of the spring cavity, and the helical angle of the second helical angle surface 401 is consistent with the helical angle of the torsion spring 3. When the torsion spring 3 is in the installed state, the two ends of the torsion spring 3 are in contact with the first helical angle surface 101 and the second helical angle surface 401 respectively, and the contact area between the cover plate 1 and the torsion spring 3 can be increased through the first helical angle surface 101, and the contact area between the tensioning arm 4 and the torsion spring 3 can be increased through the second helical angle surface 401, thereby improving the stability of the spring installation.

[0037] An adjustment positioning hole 103 is provided on one side of the cover plate 1 away from the tensioning arm 4. In this embodiment, four adjustment positioning holes 103 are provided, and the four adjustment positioning holes 103 are arranged on the cover plate 1 in a circular array.

[0038] A friction reducing collar 6 is provided between the outer side of the columnar body 405 and the inner side wall of the cavity on the base 8, and a bushing 5 is provided in the spindle through hole 403. The friction reducing collar 6 is cylindrical and sleeved on the outer side of the columnar body 405, and the friction reducing collar 6 can reduce the friction between the columnar body 405 and the inner side wall of the cavity.

[0039] A damping plate 7 is provided between the columnar body 405 and the bottom of the cavity. The damping plate 7 is circular, and an axial hole is provided in the middle of the damping plate 7 for the spindle 2 to pass through. Since the belt will vibrate to a certain extent during operation, the vibration will be transmitted to the pulley 11 and drive the tensioning arm 4 to swing back and forth within a certain angle range; in the utility model, a damping plate 7 is provided between the columnar body 405 and the bottom of the cavity, and the torsion spring 3 applies axial pressure to the columnar body 405, so that the end face of the columnar body 405 forms a contact pressure with one side of the damping plate 7, and the other side of the damping plate 7 forms a contact pressure with the bottom of the cavity. When the tensioning arm 4 swings back and forth, sliding friction occurs between the damping plate 7 and the columnar body 405, thereby forming a friction damping effect on the columnar body 405, reducing the swing amplitude of the tensioning arm 4, thereby reducing the wear between the spindle 2 and the tensioning arm 4, and helping to reduce the vibration amplitude of the belt.

[0040] A wheel axle hole is provided on one end of the tensioning arm 4 away from the main shaft through hole 403, and a wheel axle 9 is installed on the wheel axle hole. A pulley 11 is rotatably connected to the wheel axle 9, and a bearing 12 is provided between the pulley 11 and the wheel axle 9. A dust cover 10 is provided on one side of the pulley 11.

[0041] The assembly method of the tensioner includes the following specific steps:

[0042] Step 1, fix one end of the main shaft 2 to the base 8, put the damping plate 7 into the cavity on the base 8, put the friction reducing ring 6 onto the outside of the columnar body 405 on the tensioning arm 4, install the columnar body 405 on the tensioning arm 4 into the cavity on the base 8, the main shaft 2 passes through the main shaft through hole 403 on the tensioning arm 4, and make the limit block 404 on the tensioning arm 4 fall into the limit groove 802 on the base 8.

[0043] In this step, when one end of the spindle 2 is fixed to the base 8, the second connecting end 202 on the spindle 2 can be pressed into the second spindle positioning hole 801 on the base 8 by a pressing device, and the fixed connection between the spindle 2 and the base 8 is achieved by the interference fit between the second connecting end 202 and the second spindle positioning hole 801.

[0044] Step 2: Install the torsion spring 3 and the cover plate 1 on the tensioning arm 4, one end of the torsion spring 3 contacts the second spring end positioning surface 402 on the tensioning arm 4, the other end of the torsion spring 3 contacts the first spring end positioning surface 102 on the cover plate 1, and align the main shaft 2 with the first main shaft positioning hole 104 on the cover plate 1.

[0045] It should be noted that when the spindle 2 is aligned with the first spindle positioning hole 104 on the cover plate 1 , the spindle 2 is not inserted into the first spindle positioning hole 104 .

[0046] Step three, adjust the torque of the torsion spring 3 by twisting one end of the torsion spring 3 by adjusting the press-fitting equipment. When the torque of the torsion spring 3 is adjusted to the target torque value, adjust the press-fitting equipment to press-fit the cover plate 1 so that one end of the main shaft 2 is pressed into the first main shaft positioning hole 104 on the cover plate 1 and has an interference fit with the first main shaft positioning hole 104.

[0047] Among them, the adjustment and pressing equipment includes a positioning and placing seat 13, a lifting drive device 14, and a top pressing sleeve 15. The top pressing sleeve 15 is a cylindrical structure. The upper end of the top pressing sleeve 15 is connected to the lifting drive device 14, and the lifting drive device 14 drives the top pressing sleeve 15 to move up and down. The lifting drive device 14 can use a hydraulic cylinder. A mounting plate 16 is provided in the top pressing sleeve 15, and a motor 17 is provided on the mounting plate 16. The output shaft of the motor 17 is coaxially arranged with the top pressing sleeve 15. A turntable 19 is connected to the output shaft of the motor 17. A torque sensor 18 is provided between the turntable 19 and the output shaft of the motor 17. The torque sensor 18 and the motor 17 are electrically connected to the control system; the operation of the lifting drive device 14 and the motor 17 is controlled by the control system. In the utility model, the motor 17 uses a servo motor 17. The lower end of the turntable 19 is provided with a boss 20 corresponding to the adjustment positioning hole 103 on the cover plate 1. The lower end surface of the top pressing sleeve 15 is lower than the lower end surface of the rotating disk 19 and higher than the lower end surface of the boss 20. The positioning seat 13 is located below the top pressing sleeve 15. The positioning seat 13 is used to place the base 8. The positioning seat 13 is provided with a positioning groove matching the outer contour of the base 8; after the base 8 is placed in the positioning groove on the positioning seat 13, the positioning seat 13 constrains the base 8 so that the base 8 cannot rotate.

[0048] When the adjustment and pressing equipment is in use, the base 8 is placed on the positioning seat 13, the height of the top pressing sleeve 15 is adjusted by the lifting drive device 14, and the boss 20 at the lower end of the turntable 19 is extended into the adjustment positioning hole 103 on the cover plate 1, and then the motor 17 is started and drives the turntable 19 to rotate. When the turntable 19 rotates, the torsion spring 3 is driven to twist, and the torque value of the torsion spring 3 is detected by the torque sensor 18; when the torsion spring 3 reaches the target torque value, the motor 17 stops rotating; then the lifting drive device 14 drives the top pressing sleeve 15 to move downward and presses the upper end of the spindle 2 into the first spindle positioning hole 104 on the turntable 19.

[0049] Step 4: Install the pulley 11 on the tensioning arm 4.

[0050] The present utility model is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all those having the same or similar technical solutions as the present application fall within the protection scope of the present utility model.

Claims

1. A tensioner, characterized in that: It includes a base, a cover plate, a main shaft, a tensioning arm, and a torsion spring. One end of the tensioning arm is connected to a pulley, and the other end of the tensioning arm is provided with a main shaft through hole. One end of the main shaft is connected to the base. A first main shaft positioning hole is provided on the cover plate, and the end of the main shaft away from the base is interference fit with the first main shaft positioning hole on the cover plate; the tensioning arm is located between the cover plate and the base, and the main shaft passes through the main shaft through hole on the tensioning arm; a first spring end positioning surface is provided on the cover plate, and a second spring end positioning surface is provided on the tensioning arm, one end of the torsion spring contacts with the first spring end positioning surface, and the other end of the torsion spring contacts with the second spring end positioning surface; an axle hole is provided on the end of the tensioning arm away from the main shaft through hole, and an axle is installed on the axle hole, and the pulley is rotatably connected to the axle.

2. A tensioner according to claim 1, characterized in that: A limiting groove is arranged on the base, a limiting block is arranged on the tensioning arm, and the limiting block is located in the limiting groove.

3. A tensioner according to claim 1, characterized in that: A side of the cover plate away from the tensioning arm is provided with an adjustment positioning hole.

4. A tensioner according to claim 1, characterized in that: A columnar body is provided on one side of the tensioning arm, a cavity is provided on the base, and the columnar body is connected to the cavity; a spring cavity is provided in the columnar body, the spindle through hole is provided at the center of the spring cavity, and the second spring end positioning surface is provided at the bottom of the spring cavity; and a torsion spring is placed in the spring cavity.

5. A tensioner according to claim 4, characterized in that: A friction-reducing collar is arranged between the outer side of the columnar body and the inner side wall of the cavity on the base, and a bushing is arranged in the main shaft through hole.

6. A tensioner according to claim 4, characterized in that: A damping sheet is arranged between the columnar body and the bottom of the cavity.

7. A tensioner according to claim 4, characterized in that: A first helical angle surface is provided on one side of the cover plate close to the positioning surface of the first spring end, and the helical angle of the first helical angle surface is consistent with the helical angle of the torsion spring; a second helical angle surface is provided at the bottom of the spring cavity, and the helical angle of the second helical angle surface is consistent with the helical angle of the torsion spring.

8. A tensioner according to claim 1, characterized in that: A dust cover is provided on one side of the pulley.

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