Belt tensioning wheel with high sealing structure

Abstract

The utility model discloses a belt tensioning wheel with a high sealing structure. The belt tensioning wheel comprises a belt wheel, a connecting cover, a swing arm, a plane scroll torsion spring, a mounting disc, a shaft tube, a screw cap, a sealing plug, a sealing cover, a sealing guide ring, a sealing ring and a bearing plugging disc. A hook groove is formed in the peripheral wall of the connecting cover, the other supporting leg of the plane scroll torsion spring is hooked to the hook groove and blocked by the sealing plug, and the sealing cover covers the hook groove. A sealing guide ring is arranged between the open end of the connecting cover and the edge of the mounting disc, a sealing ring is arranged between the rotary cover and the reverse side of the mounting disc, and bearing sealing discs are arranged on the two sides of the belt wheel. Through multiple sealing structures, dust and liquid are effectively prevented from invading, internal parts are prevented from rusting and clamping stagnation, the working reliability of the tensioning wheel is improved, and the service life of the tensioning wheel is prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of engine belt drive systems, and in particular to a high-sealing belt tensioner for maintaining proper belt tension. Background Technology

[0002] The tensioner pulley is a key component in an engine belt drive system. Its main function is to maintain proper belt tension to ensure effective power transmission. However, the engines of engineering equipment often operate under harsh conditions, causing the tensioner pulley to be constantly exposed to dust and liquids. This can easily lead to rust or jamming of internal parts, significantly impacting its performance. Therefore, effectively improving the tensioner pulley's sealing performance to prevent external contaminants from entering is crucial for ensuring its reliable operation. Utility Model Content

[0003] In view of the problem that existing tensioning pulleys are prone to rusting or jamming due to poor sealing and easy intrusion of dust and liquid, which affects their working performance, this utility model provides a high-sealing structure belt tensioning pulley, which aims to enhance the sealing and protection capabilities of its internal key components, extend its service life, and ensure the effectiveness of power transmission.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a high-sealing belt tensioner, comprising a pulley, a connecting cover, a swing arm, and a planar spiral torsion spring; one end of the swing arm is provided with a mounting hole, and the other end is provided with a mounting plate with a central hole; a bearing is provided in the central hole of the pulley, and the pulley is mounted on the mounting hole by bolts; a rotatable shaft tube is provided in the central hole of the mounting plate, one end of the shaft tube is riveted to the connecting cover, and the other end is riveted to a cap, the connecting cover is located on the front of the mounting plate, and the cap is located on the back of the mounting plate. On the reverse side; the planar spiral torsion spring is disposed between the inner cavity of the connecting cover and the mounting plate, and one leg of the planar spiral torsion spring engages with the mounting plate; characterized in that: a hook groove is provided on the peripheral wall of the connecting cover, and the other leg of the planar spiral torsion spring hooks onto the hook groove and seals the hook groove with a plug; it also includes a cover, which covers the hook groove; a sealing guide ring is provided between the open end of the connecting cover and the edge of the mounting plate, and a sealing ring is provided between the cap and the back of the mounting plate; bearing sealing discs are respectively arranged on both sides of the pulley.

[0005] Furthermore, the groove is provided on a protruding seat, the cross-section of which matches the cross-section of the inner cavity of the cap, and the inner cavity of the cap is inserted into the protruding seat after being coated with glue.

[0006] Furthermore, the edge of the mounting plate is provided with a protruding ring, which is aligned with the port of the connecting cover. The edge of the sealing guide ring extends out of the gap between the protruding ring and the connecting cover and is provided with a sealing ring. The sealing ring extends to both sides of the sealing guide ring and seals the gap between the sealing guide ring and the connecting cover, as well as the gap between the sealing guide ring and the protruding ring, so that the edge cross-section of the sealing guide ring is "T" shaped.

[0007] Furthermore, the cap contacts the reverse side of the mounting plate, and an annular sealing groove is provided on the reverse side of the mounting plate, in which the sealing ring is installed.

[0008] Furthermore, the inner ring of the bearing sealing disc is provided with a protruding insert ring, which is inserted into the center hole of the inner ring of the bearing. The bearing sealing disc covers the entire end face of the bearing, and the inner wall of the bearing sealing disc is in contact with the inner ring of the bearing.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] 1. By setting a groove on the peripheral wall of the connecting cover for the other leg of the planar spiral torsion spring to hook onto, and sealing the groove with a plug and then covering the groove with a cover, a double-sealed protection is formed for the leg of the planar spiral torsion spring. This effectively prevents dust and liquid from entering the inner cavity of the connecting cover and the front area of ​​the mounting plate from the groove, protecting the planar spiral torsion spring from contamination and corrosion.

[0011] 2. A sealing guide ring with a "T"-shaped edge section (including a sealing ring) is set between the opening end of the connecting cover and the edge of the mounting plate, and a sealing ring is set between the screw cap and the back of the mounting plate. Bearing sealing discs are also configured on both sides of the pulley. The synergistic effect of these multiple sealing structures greatly enhances the overall sealing performance of the tensioner, effectively preventing external dust, liquid and other contaminants from entering the internal core components (such as bearings, flat spiral torsion springs, shaft tubes, etc.), avoiding problems such as rust and jamming of internal parts due to contamination, and significantly improving the working reliability and service life of the tensioner.

[0012] 3. The insert ring design of the bearing sealing disc allows it to be securely installed in the inner ring hole of the bearing and to cover the bearing end face, further preventing contaminants from entering from the pulley bearing mounting area. At the same time, it can also play a certain role in axial positioning and protection of the bearing.

[0013] 4. The overall structure is reasonably designed, and the various sealing components cooperate with each other to ensure good sealing performance without affecting the normal rotation and tensioning function of the tensioning wheel, thus ensuring the effective transmission of power.

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0015] Figure 1 This is a perspective view of a specific embodiment of the present utility model;

[0016] Figure 2 This is a cross-sectional view of a specific embodiment of the present utility model;

[0017] Figure 3 This is a partial exploded view of a specific embodiment of the present utility model;

[0018] Figure 4 This is a structural diagram of the sealing guide ring in a specific embodiment of this utility model.

[0019] Explanation of reference numerals in the attached drawings: 1-Pulley; 2-Connecting cover; 21-Hook groove; 22-Protruding seat; 3-Swing arm; 31-Mounting hole; 4-Planar spiral torsion spring; 42-Other support leg; 5-Mounting plate; 51-Central hole; 52-Protruding ring; 6-Bearing; 7-Bolt; 8-Shaft tube; 9-Screw cap; 10-Plug; 11-Cap; 12-Sealing guide ring; 121-Sealing ring; 13-Sealing ring; 14-Bearing sealing plate; 141-Plug ring; 15-Sealing groove. Detailed Implementation

[0020] The present invention will be described in detail below through embodiments, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.

[0021] like Figure 1 — Figure 4 As shown, this embodiment discloses a high-sealing structure belt tensioner, including a pulley 1, a connecting cover 2, a swing arm 3, and a planar spiral torsion spring 4.

[0022] One end of the swing arm 3 is provided with a mounting hole 31 for connecting to fixed components such as the engine block. The other end of the swing arm 3 is provided with a mounting plate 5 with a central hole 51.

[0023] The pulley 1 has a bearing 6 installed in its central hole. The pulley 1 is mounted on the mounting hole 31 of the swing arm 3 by bolts 7. (Note: According to conventional understanding, the pulley 1 should be sleeved on the outer ring of the bearing 6, and the inner ring of the bearing 6 should be mounted on a rotating shaft passing through the mounting hole 31. The bolts 7 may be used to fix the pulley 1 to the outer ring of the bearing 6 or to assist in fixing it. The original text "the pulley is mounted on the mounting hole by bolts" may be a typo or a specific structure. Here, we follow the original description, but in practice, we need to ensure that the pulley can rotate around the shaft. A more reasonable description would be: the pulley 1 is sleeved on a rotating shaft through the bearing 6 in its central hole. This rotating shaft passes through the mounting hole 31 of the swing arm 3. The bolts 7 may be used to lock the pulley 1 or other parts. Here, we describe the structural connection based on the original text.)

[0024] A rotatable shaft tube 8 is provided inside the central hole 51 of the mounting plate 5. The function of the shaft tube 8 is to support the connecting cover 2 and the screw cap 9, and to allow them to rotate relative to the mounting plate 5 (or form a swing pair with the swing arm 3). The connecting cover 2 is riveted to one end of the shaft tube 8, and the screw cap 9 is riveted to the other end, thereby fixing the connecting cover 2 and the screw cap 9 to both ends of the shaft tube 8. The connecting cover 2 covers the front of the mounting plate 5, and the screw cap 9 covers the back of the mounting plate 5.

[0025] The planar spiral torsion spring 4 is disposed between the inner cavity of the connecting cover 2 and the mounting plate 5, and the elastic force of the planar spiral torsion spring 4 provides continuous tension to the pulley 1. One leg of the planar spiral torsion spring 4 cooperates with the mounting plate 5 (for example, hooked on a protrusion or pre-set structure of the mounting plate 5) to provide a reaction force fulcrum.

[0026] As one of the core improvements, a groove 21 is provided on the peripheral wall of the connecting cover 2. The other leg 42 of the planar spiral torsion spring 4 hooks onto the groove 21, thus providing another force application / receiving fulcrum for the planar spiral torsion spring 4. To prevent contaminants from entering the inner cavity of the connecting cover 2 through the groove 21 or entering the front area of ​​the mounting plate 5 along the gap of the groove 21, a plug 10 is used to seal the opening of the groove 21, and a cover 11 is also provided. The cover 11 covers the groove 21 and the plug 10 on it, forming a double seal and further enhancing the sealing performance of this part. Preferably, the groove 21 is provided on a protrusion 22. The cross-section of the protrusion 22 matches the cross-section of the inner cavity of the cover 11. After the inner cavity of the cover 11 is pre-applied with glue, it is inserted into the protrusion 22. The cover 11 and the protrusion 22 are firmly connected and sealed by means of adhesive bonding and interference fit. As another key improvement, in order to improve the sealing of the mating surface between the connecting cover 2 and the mounting plate 5, a sealing guide ring 12 is provided between the open end of the connecting cover 2 and the edge of the mounting plate 5.

[0027] To further optimize the sealing effect, a raised ring 52 is provided on the edge of the mounting plate 5, which is aligned with the port of the connecting cover 2. The sealing guide ring 12 is fitted onto the mounting sleeve protruding in the middle of the mounting plate 5. The edge of the sealing guide ring 12 extends out of the gap between the raised ring 52 and the connecting cover 2, and a sealing ring 121 is provided. The sealing ring 121 extends to both sides of the sealing guide ring 12, sealing the gap between the sealing guide ring 12 and the inner wall of the port of the connecting cover 2 on one side, and sealing the gap between the sealing guide ring 12 and the raised ring 52 on the other side, so that the edge cross-section of the sealing guide ring 12 is generally "T" shaped. This "T" shaped sealing guide ring 12 not only plays a guiding role, but also effectively seals the gap between the connecting cover 2 and the mounting plate 5 through its special edge structure.

[0028] In addition, a sealing ring 13 is also provided between the screw cap 9 and the back of the mounting plate 5 to enhance the sealing of the mating surface.

[0029] Specifically, an annular sealing groove 15 can be provided on the reverse side of the mounting plate 5. The sealing ring 13 is installed in the sealing groove 15. When the screw cap 9 contacts and presses against the reverse side of the mounting plate 5, the sealing ring 13 deforms and fills the micro gap between the two, thereby achieving a seal.

[0030] Considering that the two ends of the bearing 6 of the pulley 1 are usually areas where contaminants are easily intruded, this utility model provides bearing sealing discs 14 on both sides of the pulley 1. The inner ring of the bearing sealing disc 14 is provided with a protruding insert ring 141, which can be tightly inserted into the hole of the inner ring of the bearing 6 to achieve the positioning of the bearing sealing disc 14. The bearing sealing disc 14 can cover the entire end face of the bearing 6 (i.e., the two exposed annular end faces of the bearing 6), and the inner wall of the bearing sealing disc 14 is in contact (or very close to) the inner ring of the bearing 6, thereby isolating the end face of the bearing 6 from the external environment and preventing dust and liquid from entering the internal balls or raceways from the axial end face of the bearing 6, thus providing good sealing protection for the bearing 6.

[0031] In summary, this utility model, through the organic combination of the above-mentioned multiple sealing structures—the grooved plug and cover at the foot of the planar spiral torsion spring, the "T"-shaped sealing guide ring between the connecting cover and the mounting plate, the sealing ring between the screw cover and the mounting plate, and the bearing sealing discs on both sides of the pulley—constructs a comprehensive high-sealing protection system that can effectively resist the intrusion of dust and liquid under harsh working conditions, protect the internal precision components of the tensioner, and ensure its long-term stable and reliable operation.

[0032] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A high-sealing belt tensioner, comprising a pulley (1), a connecting cover (2), a swing arm (3), and a planar spiral torsion spring (4); one end of the swing arm (3) is provided with a mounting hole (31), and the other end is provided with a mounting plate (5) with a central hole (51); a bearing (6) is provided in the central hole of the pulley (1), and the pulley (1) is mounted on the mounting hole (31) by bolts (7); a rotatable shaft tube (8) is provided in the central hole (51) of the mounting plate (5), one end of the shaft tube (8) is riveted to the connecting cover (2), and the other end is riveted to a cap (9), the connecting cover (2) covers the front of the mounting plate (5), and the cap (9) covers the back of the mounting plate (5); the planar spiral torsion spring (4) is disposed between the inner cavity of the connecting cover (2) and the mounting plate (5), and one leg of the planar spiral torsion spring (4) cooperates with the mounting plate (5); characterized in that: The connecting cover (2) has a groove (21) on its peripheral wall. The other leg (42) of the planar spiral torsion spring (4) is hooked onto the groove (21) and the groove (21) is sealed by a plug (10). The connecting cover (2) also includes a cover (11) that covers the groove (21). A sealing guide ring (12) is provided between the opening end of the connecting cover (2) and the edge of the mounting plate (5). A sealing ring (13) is provided between the screw cap (9) and the back of the mounting plate (5). Bearing sealing plates (14) are respectively arranged on both sides of the pulley (1).

2. The high-sealing belt tensioner according to claim 1, characterized in that: The groove (21) is set on a protrusion (22), the cross-section of the protrusion (22) matches the cross-section of the inner cavity of the cover (11), and the inner cavity of the cover (11) is coated with glue and then inserted into the protrusion (22).

3. The high-sealing belt tensioner according to claim 1, characterized in that: The mounting plate (5) has a protruding ring (52) on its edge, which is aligned with the port of the connecting cover (2). The edge of the sealing guide ring (12) extends out of the gap between the protruding ring (52) and the connecting cover (2) and is provided with a sealing ring (121). The sealing ring (121) extends to both sides of the sealing guide ring (12) and seals the gap between the sealing guide ring (12) and the connecting cover (2) as well as the gap between the sealing guide ring (12) and the protruding ring (52).

4. The high-sealing belt tensioner according to claim 1, characterized in that: The cap (9) contacts the reverse side of the mounting plate (5), and an annular sealing groove (15) is provided on the reverse side of the mounting plate (5), and the sealing ring (13) is installed in the sealing groove (15).

5. The high-sealing belt tensioner according to claim 1, characterized in that: The inner ring of the bearing sealing disc (14) is provided with a protruding insert ring (141), which is inserted into the inner ring hole of the bearing (6). The bearing sealing disc (14) covers the entire end face of the bearing (6), and the inner wall of the bearing sealing disc (14) is in contact with the inner ring of the bearing (6).

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