Special high-sealing belt tensioning wheel for engineering machinery engine

Abstract

The utility model discloses a special high-sealing belt tensioning wheel for an engineering machinery engine. The special high-sealing belt tensioning wheel comprises a mounting seat, a torsion spring, a swing arm and a belt wheel, the mounting seat is provided with a mounting groove with lubricating oil and a sealing cover, and a rotating shaft and a torsional spring are arranged in the mounting groove. One end of the swing arm is connected with the rotating shaft through a screwing hole with an annular positioning block and a rotating groove and is fixed through a side opening insertion pipe type bolt, and the rotating shaft is flush with the end face of the screwing hole. The other end of the swing arm is connected with a bearing through a bolt and a nut. A shaft cover is arranged at the outer end of the belt wheel, an annular sealing ring is arranged in a hole limiting groove in the inner end, and the shaft cover and the sealing ring jointly block an inner hole of the belt wheel and the bearing. And the bent part of the swing arm is matched with the boss of the mounting seat. Dust and liquid are effectively blocked through multiple sealing structures, the shaft part is prevented from being blocked by accumulated dust, maintenance is reduced, and the use efficiency of equipment is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of engineering machinery engine parts, and in particular to a high-seal special belt tensioner for engineering machinery engines. Background Technology

[0002] Construction machinery often operates under harsh conditions, and the engines used in construction machinery must be high-powered. During use, the tensioner pulley in the engine is frequently subjected to dust and liquid contamination, causing its shaft to easily jam due to dust accumulation. This significantly affects the tension of the engine belt, thus requiring frequent maintenance and operation, which greatly impacts the efficiency of the construction machinery. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a high-sealing special belt tensioner for engineering machinery engines, so as to solve the problems of easy jamming of the tensioner shaft due to dust accumulation, frequent maintenance, and reduced equipment efficiency in the existing technology.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a high-sealing special belt tensioner for engineering machinery engines, comprising a mounting base, a torsion spring, a swing arm, and a pulley.

[0005] The mounting base has a mounting groove, and the torsion spring is installed in the mounting groove. A rotating shaft passes through the center of the mounting groove. One end of the torsion spring passes through the rotating shaft, and the other end hooks onto the inner wall of the mounting groove. The mounting groove is filled with lubricating oil and sealed with a cap. By filling the mounting groove with lubricating oil and sealing it with a cap, the rotating shaft can be effectively lubricated, friction can be reduced, and external dust and liquid can be initially prevented from entering the mounting groove and contaminating the lubricating oil.

[0006] One end of the rotating shaft extends out of the mounting base, and one end of the swing arm is provided with a screw-in hole. The first end of the screw-in hole is provided with a rotating groove. A corresponding annular positioning block is protruding from the outer wall of the mounting base. The annular positioning block matches the rotating groove. After the screw-in hole mates with the extending rotating shaft, the annular positioning block is placed within the rotating groove. A pin is provided between the screw-in hole and the rotating shaft to circumferentially fix both. The engagement of the annular positioning block and the rotating groove positions and guides the rotation of the swing arm relative to the mounting base, while the pin ensures that there is no relative rotation between the swing arm and the rotating shaft, guaranteeing transmission reliability.

[0007] As a preferred embodiment, the pin is a side-opening insertion tube structure, allowing it to be tightly inserted into the sidewalls of the rotating shaft and the screw hole through outward elastic deformation of the side opening. This design makes the installation and removal of the pin more convenient, while ensuring a tight and reliable connection.

[0008] As a preferred embodiment, the end face of the rotating shaft is flush with the end face of the screw hole. This helps improve the sealing of the joint between the swing arm and the mounting base, reducing the possibility of dust entering through the gap.

[0009] The other end of the swing arm is provided with a socket, and a bearing is connected to the socket by bolts and nuts. The pulley is integrally connected to the outer ring of the bearing. The pulley is provided with a sealing structure for the bearing. The sealing structure includes a shaft cover disposed at the outer end of the pulley. The shaft cover is used to seal the bearing in the inner hole of the pulley. The inner end of the pulley is provided with a perforated limiting groove. An annular sealing ring is installed in the perforated limiting groove. The inner diameter of the annular sealing ring matches the outer diameter of the bolt. After the bolt is fitted with a washer, it passes through the socket and the inner ring of the bearing in sequence. Then, the nut is screwed on to lock the inner ring of the bearing. The annular sealing ring and the shaft cover are used together to seal the inner hole of the pulley and the bearing.

[0010] By setting shaft caps and annular sealing rings with bolt adapter holes at both ends of the pulley, the inner hole of the pulley and the internal bearing can be effectively sealed, forming a relatively closed space. This prevents dust, liquid and other impurities from directly corroding the bearing and the internal components of the pulley, thereby significantly improving the sealing performance and resistance to harsh working conditions of the tensioner, reducing jamming caused by dust accumulation and maintenance frequency, and improving the efficiency of engineering machinery and equipment.

[0011] As a preferred embodiment, the swing arm is further provided with a bent portion, and the mounting base is provided with a boss. The swing arm can move towards the boss under the action of the torsion spring. The cooperation between the bent portion and the boss can provide a reliable initial position or limit for the swing arm, ensuring that the tensioning pulley can maintain a preset tension state when it is not subjected to excessive belt tension.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. High sealing design: Through multiple sealing structures such as mounting groove cover, flat pin end face, shaft cover and annular sealing ring at both ends of the pulley, dust and liquid are effectively blocked from intruding into the key moving parts of the tensioner (such as shaft and bearing), and the problem of dust accumulation and jamming in the shaft is solved.

[0014] 2. Reduced maintenance frequency: Excellent sealing performance significantly reduces the contamination and wear rate of internal parts of the tensioner, thereby reducing frequent maintenance operations caused by problems such as jamming.

[0015] 3. Improved efficiency: Reduced maintenance frequency directly increases the continuous operating time and overall efficiency of construction machinery and equipment.

[0016] 4. Reliable structure: The torsion spring is fully lubricated, the swing arm is firmly connected to the shaft, and the pulley is reliably connected to the bearing, ensuring the long-term stable operation of the tensioner.

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0018] Figure 1 The three-dimensional representation of the specific embodiment of this utility model Figure 1 ;

[0019] Figure 2 The three-dimensional representation of the specific embodiment of this utility model Figure 2 ;

[0020] Figure 3 This is a cross-sectional view of a specific embodiment of the present utility model.

[0021] Explanation of reference numerals in the attached drawings: 1-Mounting base, 11-Mounting groove, 12-Rotating shaft, 14-Annular positioning block, 15-Boss; 2-Torsion spring; 3-Swing arm, 31-Rotating hole, 311-Rotating groove, 32-Pin, 33-Insertion hole, 34-Bolt, 35-Nut, 36-Bearing, 37-Washer, 38-Bend; 4-Pulley, 41-Shaft cover, 42-Limiting groove with hole, 43-Annular sealing ring, 20-Double lip seal, 21-Sealing ring. Detailed Implementation

[0022] 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.

[0023] like Figure 1 — Figure 3 As shown, this embodiment provides a high-seal special belt tensioner for engineering machinery engines, including a mounting base 1, a torsion spring 2, a swing arm 3, and a pulley 4.

[0024] The mounting base 1 is provided with a mounting groove 11, the torsion spring 2 is installed in the mounting groove 11, a rotating shaft 12 passes through the center of the mounting groove 11, one end of the torsion spring 2 passes through the rotating shaft 12, and the other end hooks onto the inner wall of the mounting groove 11. A sealing ring 21 and a double-lip sealing ring 20 are also provided between the rotating shaft and the mounting base to prevent dust from entering from the shaft hole of the mounting base.

[0025] In this embodiment, the mounting groove 11 is a cylindrical blind hole, and the two ends of the rotating shaft 12 are respectively supported at the bottom of the mounting groove 11 and protrude from the side wall of the mounting base 1. The mounting groove 11 is pre-filled with an appropriate amount of lubricating oil (not shown in the figure), and then the opening of the mounting groove 11 is sealed by a cap to prevent lubricating oil leakage and the entry of external contaminants. The lubricating oil can provide good lubrication for the rotating shaft 12 and reduce its rotational resistance.

[0026] Reference Figure 3 One end of the rotating shaft 12 protrudes through the outer wall of the mounting base 1. One end of the swing arm 3 is provided with a screw-in hole 31, which is a stepped hole. Its first end (the end closest to the mounting base 1) is provided with a rotating groove 311, the cross-section of which is circular for positioning. A corresponding annular positioning block 14 protrudes from the outer wall of the mounting base 1. The shape of the annular positioning block 14 matches the rotating groove 311. After the screw-in hole 31 engages with the protruding rotating shaft 12, the annular positioning block 14 is precisely positioned within the rotating groove 311. This restricts the axial movement of the swing arm 3 relative to the mounting base 1 while allowing the swing arm 3 to rotate around the rotating shaft 12. To prevent circumferential relative rotation between the swing arm 3 and the rotating shaft 12, a pin 32 is provided between the screw-in hole 31 and the rotating shaft 12. In this embodiment, the pin 32 is a side-opening insertion tube structure (similar to the principle of a C-type snap ring or cotter pin, but here it is tubular and used for radial insertion and fixing). By elastically expanding the side opening of the pin 32 outward and inserting it into the corresponding pin holes on the side wall of the screw hole 31 and the side wall of the rotating shaft 12 (or directly using the gap between the two for interference / tight fit), a tight insertion and fixing can be achieved, ensuring that the swing arm 3 and the rotating shaft 12 rotate synchronously.

[0027] Furthermore, the end face of the rotating shaft 12 is flush or substantially flush with the end face of the screw hole 31 (referring to the stepped surface inside the screw hole used to accommodate the end face of the rotating shaft). This can minimize the gap between the two, improve the sealing of the joint, and prevent dust from entering from here.

[0028] The other end of the swing arm 3 (i.e., the end away from the mounting base 1) is provided with a socket 33, which is usually a through hole with a diameter that matches the inner ring diameter of the bearing 36. The bearing 36 is connected to the socket 33 by bolts 34 and nuts 35. Specifically, the bearing 36 is first placed into the end of the swing arm 3 (or pre-positioned by other means), then the bolt 34 is fitted with a washer 37 and passed through the socket 33 and the inner ring of the bearing 36 in sequence, and finally the nut 35 is screwed on. Tightening the nut 35 will securely lock the inner ring of the bearing 36 onto the swing arm 3.

[0029] The pulley 4 is integrally connected to the outer ring of the bearing 36 (e.g., by injection molding or machining, or by using a high-strength adhesive), allowing the pulley 4 to rotate freely with the outer ring of the bearing 36, while the inner ring of the bearing 36 is fixed relative to the rocker arm 3. To prevent dust and liquid from corroding the bearing 36 and the interior of the pulley 4, a shaft cover 41 is provided at the outer end of the pulley 4 (i.e., the end away from the rocker arm 3). The shaft cover 41 is usually fixed to the outer end face of the pulley 4 by riveting, snap-fitting, or bolting, and its function is to seal the outer ring end face of the bearing 36 and the outer port of the pulley 4 in the inner hole of the pulley 4. A perforated limiting groove 42 is provided at the inner end of the pulley 4 (i.e., the end near the rocker arm 3). The perforated limiting groove 42 is opened along the axial direction of the pulley 4, and its width matches the thickness of the annular sealing ring 43, while its depth is sufficient to accommodate the annular sealing ring 43. An annular sealing ring 43 is installed within the perforated limiting groove 42. The inner diameter of the annular sealing ring 43 is designed to match the outer diameter of the bolt 34 (e.g., slightly larger than the outer diameter of the bolt 34, forming a clearance fit or transition fit). When the bolt 34 passes through the insertion hole 33 and the inner ring of the bearing 36 and the nut 35 is tightened, the head of the bolt 34 will be located in the inner space of the annular sealing ring 43. Under the constraint of the perforated limiting groove 42, the annular sealing ring 43 will cover and tightly adhere to the inner wall of the pulley 4, thereby sealing the inner hole of the pulley 4, the inner ring end face of the bearing 36, and the inner port of the pulley 4. In this way, the shaft cover 41 and the annular sealing ring 43 together form a closed chamber from both the inner and outer ends of the pulley 4, completely enclosing the bearing 36, effectively preventing dust and liquid from entering the bearing 36 from both ends of the pulley 4, achieving a high sealing effect.

[0030] Furthermore, referring to Figure 1 The swing arm 3 is further provided with a bent portion 38 at the middle or a suitable position, and the mounting base 1 is provided with a boss 15. When the tension wheel is not subjected to additional belt tension, the swing arm 3 can move towards the boss 15 under the return force of the torsion spring 2, and the bent portion 38 can contact and cooperate with the boss 15, providing a stable initial position or a limit for the maximum tension stroke of the swing arm 3, ensuring that the belt is always in a proper tension state.

[0031] In use, the tensioner pulley is installed on the corresponding position on the engine block via its mounting base 1. Engine operation drives the belt, and the belt's reaction force or its own tension requirements cause the swing arm 3 to overcome the spring force of the torsion spring 2 and rotate around the shaft 12 by a certain angle, thereby adjusting the belt tension. When the belt tension changes or slackens, the torsion spring 2 automatically drives the swing arm 3 to reset, restoring the belt to the appropriate tension. Because this tensioner pulley has multiple high-sealing structures, it effectively resists dust and liquid intrusion under harsh working conditions, ensuring the smooth operation of key components such as the shaft 12 and bearing 36, greatly extending the maintenance cycle and improving the efficiency of the construction machinery.

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

Claims

1. A high-sealing special belt tensioner for engineering machinery engines, characterized in that, include: Mounting base (1), torsion spring (2), swing arm (3) and pulley (4); The mounting base (1) is provided with a mounting groove (11), the torsion spring (2) is installed in the mounting groove (11), a rotating shaft (12) passes through the center of the mounting groove (11), one end of the torsion spring (2) passes through the rotating shaft (12), and the other end hooks onto the inner wall of the mounting groove (11). The mounting groove (11) is filled with lubricating oil and sealed with a cap. One end of the rotating shaft (12) extends out of the mounting base (1), and one end of the swing arm (3) is provided with a screw hole (31). The first end of the screw hole (31) is provided with a rotating groove (311). A corresponding annular positioning block (14) is provided on the outer wall of the mounting base (1). The annular positioning block (14) matches the rotating groove (311). After the screw hole (31) is engaged with the through rotating shaft (12), the annular positioning block (14) is placed in the rotating groove (311). A pin (32) for circumferentially fixing the two is provided between the screw hole (31) and the rotating shaft (12). The other end of the swing arm (3) is provided with a socket (33), and a bearing (36) is connected to the socket (33) by bolts (34) and nuts (35). The pulley (4) is integrally connected to the outer ring of the bearing (36), and a sealing structure for the bearing is provided on the pulley.

2. The high-sealing special belt tensioner for engineering machinery engines according to claim 1, characterized in that, The pin (32) is a side-opening insertion tube structure, so that the pin (32) can be tightly inserted into the side wall of the rotating shaft (12) and the screw hole (31) through the outward elastic deformation of the side opening.

3. The high-sealing special belt tensioner for engineering machinery engines according to claim 1, characterized in that, The sealing structure includes a shaft cover (41) disposed at the outer end of the pulley (4), the shaft cover (41) being used to seal the bearing (36) in the inner hole of the pulley (4), the inner end of the pulley (4) being provided with a perforated limiting groove (42), an annular sealing ring (43) being installed in the perforated limiting groove (42), the inner diameter of the annular sealing ring (43) being matched with the outer diameter of the bolt (34), the bolt (34) being fitted with a washer (37) and then passing through the insertion hole (33) and the inner ring of the bearing (36) in sequence, and then screwing the nut (35) to lock the inner ring of the bearing (36), the annular sealing ring (43) and the shaft cover (41) being used together to seal the inner hole of the pulley (4) and the bearing (36).

4. The high-sealing special belt tensioner for engineering machinery engines according to claim 1, characterized in that, The end face of the rotating shaft (12) is flush with the end face of the screw hole (31).

5. The high-sealing special belt tensioner for engineering machinery engines according to claim 1, characterized in that, The swing arm (3) is also provided with a bending part (38), and the mounting base (1) is provided with a boss (15). The swing arm (3) can move towards the boss (15) under the action of the torsion spring (2).

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