Automatic tensioning wheel bearing

Abstract

The utility model relates to the technical field of bearings, in particular to an automatic tensioning wheel bearing which comprises a shell and a bearing assembly installed in the shell. The eccentric wheel is inserted into the bearing assembly, the eccentric shaft is inserted into the eccentric wheel, the eccentric wheel is sleeved with the steel gasket, one end of the eccentric shaft is sleeved with the fixing frame, and the torsional spring is located between the steel gasket and the fixing frame. One torsion arm of the torsion spring is arranged in the axial direction and connected to the steel gasket in an inserted mode, the other torsion arm of the torsion spring is arranged in the radial direction and connected to the fixing frame in a clamped mode in the axial direction, the fixing frame is fixedly connected with the eccentric shaft, and a limiting ring is arranged at the end, away from the fixing frame, of the eccentric shaft.

Description

Technical Field

[0001] This application relates to the technical field of bearings, and particularly to an automatic tensioner bearing. Background Technology

[0002] In automotive engine transmission systems, tension control of transmission belts such as timing belts and multi-ribbed belts is crucial for ensuring power transmission efficiency and system reliability. The automatic tensioner bearing, as a core actuator, dynamically adjusts the transmission belt tension to compensate for tension fluctuations caused by temperature changes, component wear, or elastic deformation, thereby ensuring timing accuracy, reducing transmission noise, and extending the transmission system's lifespan.

[0003] The installation process is complex due to the large number of components required, including eccentric wheels, torsion springs, mounting brackets, and bearing assemblies. Utility Model Content

[0004] To simplify the installation structure, this application provides an automatic tensioner bearing.

[0005] This application provides an automatic tensioner bearing, which adopts the following technical solution:

[0006] An automatic tensioning wheel bearing includes a housing and a bearing assembly installed within the housing. It also includes an eccentric wheel inserted into the bearing assembly, an eccentric shaft inserted into the eccentric wheel, a steel washer sleeved on the eccentric wheel, a fixing frame sleeved on one end of the eccentric shaft, and a torsion spring located between the steel washer and the fixing frame. One torsion arm of the torsion spring is axially arranged and inserted into the steel washer, while the other torsion arm is radially arranged and axially engaged with the fixing frame. The fixing frame is fixedly connected to the eccentric shaft, and a limiting ring is provided at the end of the eccentric shaft away from the fixing frame.

[0007] By adopting the above technical solution, both the eccentric wheel and the eccentric shaft are installed using a direct plug-in method. After installing steel washers, the torsion spring is fitted onto the eccentric wheel and eccentric shaft, with the torsion arm inserted into the steel washers. Then, the fixing bracket is fitted onto the eccentric shaft, forming a snap-fit ​​connection. During the fixing bracket installation process, one torsion arm of the torsion spring snaps into the fixing bracket, and then into the eccentric shaft. After installation, all parts are axially fixed by the limiting rings of the fixing bracket and the eccentric shaft.

[0008] In one embodiment: one end of the eccentric shaft is provided with a connecting part for engaging with the fixing frame, the connecting part having a fan-shaped or polygonal structure, and the fixing frame having a locking interface that mates with the connecting part.

[0009] In one embodiment: the thickness of the connecting part along the axial direction is greater than that of the fixing frame, and the end face of the connecting part is provided with a plurality of first stamping recesses for expanding the connecting part and the fixing frame to form a snap-fit.

[0010] In one embodiment: one end of the eccentric shaft is provided with a connecting part for inserting a fixing frame, the connecting part is fan-shaped or polygonal, and the fixing frame is provided with a snap-fit ​​interface that mates with the connecting part; a limiting member formed by splicing is installed on the connecting part, and the limiting member axially positions the fixing frame.

[0011] In one embodiment: the limiting member includes two splicing parts, the side wall of the connecting part is provided with a slot, the two splicing parts are provided with connecting ears that cooperate with the slot, and the two splicing parts are snap-fit ​​connected.

[0012] In one embodiment: the end protrusion of the splicing component is provided with a plug arm and a plug groove, the plug arms and plug grooves on the two splicing components are staggered, and the opposite end faces of the plug arms and plug grooves are provided with one-way locking teeth.

[0013] In one embodiment, the end face of the splice is provided with a plurality of second stamping recesses.

[0014] In one embodiment, the eccentric wheel is provided with a plug hole for inserting the torsion arm.

[0015] In one embodiment: the outer edge of the fixing frame is provided with two limiting parts extending toward the steel pad and at least one locking part for the torsion arm to engage, the locking part being provided with a hook extending in the circumferential direction; the steel pad is provided with a limiting block extending toward the fixing frame, the limiting block being located between the two limiting parts in the circumferential direction.

[0016] In one embodiment, the torsion spring provides an outward elastic tendency force toward the fixing frame along the axial direction. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1;

[0018] Figure 2 This is a schematic diagram of the internal structure of Embodiment 1;

[0019] Figure 3 This is a schematic diagram of the exploded structure of Embodiment 1;

[0020] Figure 4 This is the front view of Embodiment 1;

[0021] Figure 5 This is a schematic diagram of the overall structure of Embodiment 2;

[0022] Figure 6 This is a schematic diagram of the limiting component and eccentric shaft in this embodiment two;

[0023] Figure 7This is a schematic diagram of the limiting component in Embodiment 2.

[0024] In the figure, 100 is the outer casing; 200 is the bearing assembly; 300 is the eccentric wheel; 400 is the eccentric shaft; 410 is the connecting part; 411 is the first stamped recess; 412 is the slot; 420 is the mounting hole; 500 is the oilless bearing; 600 is the steel gasket; 610 is the limiting block; 700 is the fixing frame; 710 is the limiting part; 720 is the snap-fit ​​part; 730 is the snap hook; 800 is the torsion spring; 900 is the limiting component; 910 is the splicing component; 911 is the connecting ear; 912 is the plug arm; 913 is the plug groove; and 914 is the second stamped recess. Detailed Implementation

[0025] The present application will be further described in detail below with reference to the accompanying drawings.

[0026] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0027] Example 1: An automatic tensioner bearing, such as Figure 1 and Figure 2 As shown, it includes a housing 100, a bearing assembly 200 installed in the housing 100, an eccentric wheel 300 inserted in the bearing assembly 200, an eccentric shaft 400 inserted in the eccentric wheel 300, a steel washer 600 sleeved on the eccentric wheel 300, a fixing bracket 700 sleeved on one end of the eccentric shaft 400, a torsion spring 800 located between the steel washer 600 and the fixing bracket 700, and an oilless bearing 500 disposed between the eccentric wheel 300 and the eccentric shaft 400.

[0028] Among them, the eccentric wheel 300, the oilless bearing 500 and the eccentric shaft 400 are all provided with a limiting ring at one end. Through the design of the limiting ring, the eccentric wheel 300, the oilless bearing 500 and the eccentric shaft 400 can only be inserted in one direction, and only one side needs to be fixed to complete the fixation.

[0029] In this embodiment, the fixed frame 700 is fixedly connected to the eccentric shaft 400, and the torsion spring 800 provides an outward elastic tendency force to the fixed frame 700 along the axial direction. The overall installation is completed by the fixed connection between the fixed frame 700 and the eccentric shaft 400. Under the circumferential tendency force formed by the torsion spring 800 of the steel washer 600, the eccentric wheel 300 and the oilless bearing 500, circumferential positioning can be achieved.

[0030] In addition, in order to facilitate the fixed connection between the fixing frame 700 and the eccentric shaft 400, one end of the eccentric shaft 400 is provided with a connecting part 410 for engaging with the fixing frame 700. The connecting part 410 has a fan-shaped or polygonal structure. In this embodiment, a fan-shaped structure is adopted. The fixing frame 700 is provided with a snap-fit ​​interface that cooperates with the connecting part 410.

[0031] The eccentric shaft 400 is provided with an eccentric mounting hole 420. It should be noted that the sector shape referred to in this embodiment refers to the shape of a circle after a portion has been cut off in a straight line, and the remaining area is required to be at least two-thirds of the circle. Regardless of the shape, the mounting hole 420 must be completely located on the end face of the connecting part 410.

[0032] In addition, see appendix Figure 1 The thickness of the connecting part 410 along the axial direction is greater than that of the fixing frame 700, and a plurality of first stamping recesses 411 are stamped on the end face of the connecting part 410. The first stamping recesses 411 are used to expand the connecting part 410 so as to form a snap-fit ​​with the fixing frame 700 to achieve fixation.

[0033] The first stamping recess 411 is located at the edge of the connecting part 410. By stamping, the side wall of the connecting part 410 is deformed, thereby abutting against the snap-fit ​​interface. Conversely, it should be noted that the first stamping recess 411 should not be too close to the mounting hole 420, so that the mounting hole 420 is not deformed when the first stamping recess 411 is stamped.

[0034] like Figure 2 and Figure 3 As shown, one torsion arm of the torsion spring 800 is arranged axially and inserted into the steel washer 600. In order to improve the connection strength, the eccentric wheel 300 is provided with a insertion hole for the torsion arm to be inserted. In this way, the insertion length of the torsion arm can be extended and the connection stability can be improved.

[0035] See attached document Figure 3 and attached Figure 4 The other torsion arm of the torsion spring 800 is arranged radially and is engaged with the fixing frame 700 axially.

[0036] The outer edge of the fixing frame 700 is provided with two limiting parts 710 extending toward the steel pad 600 and at least one locking part 720 for locking the torsion arm. The locking part 720 is provided with a hook 730 extending in the circumferential direction.

[0037] The steel pad 600 is provided with a limiting block 610 extending toward the fixing frame 700. The limiting block 610 is located between two limiting parts 710 in the circumferential direction. The rotation angle of the fixing frame 700 is limited by the limiting block 610 and the two limiting parts 710.

[0038] Example 2: Figure 5and Figure 6 As shown, the difference from Embodiment 1 is that the connection method between the eccentric shaft 400 and the fixed frame 700 is different.

[0039] Specifically, one end of the eccentric shaft 400 is provided with a connecting part 410 for the fixing bracket 700 to be inserted. The connecting part 410 has a fan-shaped or polygonal structure, and the fixing bracket 700 is provided with a card interface that cooperates with the connecting part 410.

[0040] A limiting component 900 formed by splicing is installed on the connecting part 410, and the limiting component 900 is axially positioned and fixed by a bracket 700.

[0041] The limiting member 900 includes two splicing members 910, and the side wall of the connecting part 410 is provided with a slot 412, which is combined with the attached Figure 7 The two splicing pieces 910 are provided with connecting ears 911 that mate with the slot 412. After the two splicing pieces 910 are spliced ​​together, the connecting ears 911 are inserted into the slot 412 to achieve axial positioning.

[0042] The two splicing parts 910 are connected by a snap-fit ​​mechanism. Specifically, the splicing end of the splicing part 910 is provided with a plug arm 912 and a plug groove 913. The plug arms 912 and plug grooves 913 on the two splicing parts 910 are staggered, that is, the plug arm 912 on one splicing part 910 can be inserted into the plug groove 913 of the other splicing part 910.

[0043] In addition, in order to form a stable structure after the two splicing parts 910 are spliced, the opposite end faces of the plug arm 912 and the plug groove 913 are provided with one-way locking teeth. The locking teeth form a lock, and at the same time, the axial tendency force formed by the torsion spring 800 can make the structure formed after the splicing parts 910 are spliced ​​more stable.

[0044] Furthermore, to achieve further connection stability, multiple second stamping recesses 914 can be stamped on the end face of the splicing component 910. The second stamping recesses 914 are preferably located at the connection position between the insertion arm 912 and the insertion slot 913. Stamping the second stamping recesses 914 causes deformation of the insertion arm 912 and the insertion slot 913, thereby improving the splicing firmness. Simultaneously, when the stamped second stamping recesses 914 reach a certain depth, causing deformation of both the back surface of the limiting component 900 and the end face of the fixing frame 700, the resulting connection firmness reaches its optimal level.

[0045] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An automatic tensioner bearing, comprising a housing (100) and a bearing assembly (200) mounted within the housing (100), characterized in that: It also includes an eccentric wheel (300) inserted into the bearing assembly (200), an eccentric shaft (400) inserted into the eccentric wheel (300), a steel washer (600) sleeved on the eccentric wheel (300), a fixing frame (700) sleeved on one end of the eccentric shaft (400), and a torsion spring (800) located between the steel washer (600) and the fixing frame (700); one torsion arm of the torsion spring (800) is arranged axially and inserted into the steel washer (600), and the other torsion arm is arranged radially and snapped into the fixing frame (700) axially; the fixing frame (700) is fixedly connected to the eccentric shaft (400), and a limiting ring is provided at the end of the eccentric shaft (400) away from the fixing frame (700).

2. The automatic tensioner bearing according to claim 1, characterized in that: One end of the eccentric shaft (400) is provided with a connecting part (410) for engaging with the fixing frame (700). The connecting part (410) has a fan-shaped or polygonal structure. The fixing frame (700) is provided with a locking interface that engages with the connecting part (410).

3. The automatic tensioner bearing according to claim 2, characterized in that: The thickness of the connecting part (410) along the axial direction is greater than that of the fixing frame (700). The end face of the connecting part (410) is provided with a plurality of first stamping recesses (411) for expanding the connecting part (410) and the fixing frame (700) to form a snap-fit.

4. The automatic tensioner bearing according to claim 1, characterized in that: One end of the eccentric shaft (400) is provided with a connecting part (410) for the fixing frame (700) to be inserted. The connecting part (410) has a fan-shaped or polygonal structure. The fixing frame (700) is provided with a card interface that cooperates with the connecting part (410). A limiting member (900) formed by splicing is installed on the connecting part (410). The limiting member (900) axially positions the fixing frame (700).

5. The automatic tensioner bearing according to claim 4, characterized in that: The limiting member (900) includes two splicing parts (910), and the side wall of the connecting part (410) is provided with a slot (412). The two splicing parts (910) are provided with connecting ears (911) that cooperate with the slot (412), and the two splicing parts (910) are snap-fit ​​connected.

6. The automatic tensioner bearing according to claim 5, characterized in that: The splicing end of the splicing component (910) is provided with a plug arm (912) and a plug groove (913). The plug arms (912) and plug grooves (913) on the two splicing components (910) are staggered. The opposite end faces of the plug arms (912) and plug grooves (913) are provided with one-way locking teeth.

7. The automatic tensioner bearing according to claim 6, characterized in that: The splicing component (910) has a plurality of second stamping recesses (914) on its end face.

8. The automatic tensioner bearing according to claim 1, characterized in that: The eccentric wheel (300) is provided with a insertion hole for inserting the torsion arm.

9. The automatic tensioner bearing according to claim 1, characterized in that: The outer edge of the fixing frame (700) is provided with two limiting parts (710) extending toward the steel pad (600) and at least one locking part (720) for locking the torsion arm. The locking part (720) is provided with a hook (730) extending in the circumferential direction. The steel pad (600) is provided with a limiting block (610) extending toward the fixing frame (700). The limiting block (610) is located between the two limiting parts (710) in the circumferential direction.

10. The automatic tensioner bearing according to claim 1, characterized in that: The torsion spring (800) provides an outward elastic tendency force along the axial direction of the fixing frame (700).

Images