Integrated tensioning wheel device

Abstract

This utility model discloses an integrated tensioning pulley device, belonging to the technical field of auxiliary equipment for heavy vehicle engines. The device includes a mounting base, two swing arms, an idler pulley, and two pulleys. One end of the mounting base has an idler pulley, and the other end has a first shaft hole, with a second shaft hole near the idler pulley. The two swing arms are mounted on both sides of the second shaft hole via long bolts. Each swing arm has a pulley at its upper end and a hydraulic support rod connected to its lower end. The ends of the hydraulic support rods are rotatably connected to the first shaft hole via short bolts, and a compression spring is fitted onto the rod body to provide elastic support. The two swing arms are symmetrically arranged, and the pulleys are fixed to the inner side of the swing arms via pulley bolts. The gap between the two pulleys is less than their width to prevent the belt from slipping off. The long bolts are connected to the second shaft hole via double-ear washers with limiting lugs for easy assembly and disassembly. This utility model can tension two belts simultaneously, saving engine compartment space, improving assembly and maintenance efficiency, and extending belt life.

Description

Technical Field

[0001] This utility model relates to the field of auxiliary equipment technology for heavy vehicle engines, and in particular to a multi-belt integrated tensioning device for diesel engines. Background Technology

[0002] In heavy-duty trucks and high-power engineering vehicles, the cooling fans of diesel engines are powerful and are typically driven by a dedicated belt; meanwhile, accessories such as water pumps, generators, and power steering pumps are driven by another belt. In existing technology, these two belts are usually handled by two independent tensioner assemblies. Each tensioner assembly includes a mounting bracket, tension arm, tensioner pulley, and elastic element, and is fixed in different locations in the engine compartment. Due to the limited space in the engine compartment, independently arranged tensioner assemblies occupy a significant amount of installation space, increase the difficulty of piping and wiring harness layout, and complicate the assembly process.

[0003] In addition, the adjustment of the independent tensioners needs to be done separately, which takes a long time and makes it difficult to ensure that the tension of the two belts is consistent. This can easily lead to uneven belt wear, slippage or skipped teeth, affecting the stability and lifespan of the transmission system. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this utility model is to provide an integrated tensioning wheel device that can simultaneously tension two belts on a single mounting base, significantly saving engine compartment layout space and improving assembly efficiency and operational reliability.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An integrated tensioning wheel device includes a mounting base, two swing arms, an idler wheel, and two pulleys. One end of the mounting base has an idler wheel, and the other end has a first shaft hole. A second shaft hole is located near the idler wheel. The middle portions of the two swing arms are mounted to both sides of the second shaft hole via long bolts. The upper ends of the swing arms are each equipped with rotatable pulleys, and their lower ends are connected to hydraulic support rods. The ends of the hydraulic support rods are rotatably connected to the first shaft hole via short bolts. Compression springs are provided on the hydraulic support rods to provide elastic support. Each swing arm has a limiting protrusion, and a limiting bolt that mates with the limiting protrusion is screwed onto the mounting base. Under the action of the hydraulic support rods, the swing arms rotate to the limiting bolts and abut against them, achieving stable locking of the tensioned position. The two swing arms are symmetrically arranged around the mounting base. The pulleys are mounted on the side of the swing arms facing the mounting base via pulley bolts. A gap, smaller than the width of the pulleys, is left between the two pulleys to prevent belt slippage.

[0007] Furthermore, the long bolt passes through the bushing in the second shaft hole and connects with the limiting nut. A damping ring is provided between the bushing and the inner wall of the second shaft hole. A double-ear washer is provided between the damping ring and the port of the second shaft hole. The outer edge of the double-ear washer is provided with symmetrical limiting lugs to facilitate quick disassembly and assembly and to prevent the double-ear washer from rotating.

[0008] Furthermore, both the idler wheel and the pulley are made of wear-resistant alloy material and have been hardened to improve their service life.

[0009] Furthermore, the hydraulic support rod is equipped with a damping structure to buffer the impact load during engine operation.

[0010] The beneficial effects of this utility model are:

[0011] 1. Optimization of spatial layout

[0012] This invention integrates two sets of tensioning mechanisms onto the same mounting base, sharing a single mounting reference. This reduces the number of parts and mounting points, significantly lowers the difficulty of layout within the engine compartment, and solves the problems of large space occupation and difficult pipeline layout caused by multiple independent tensioning wheels in traditional structures.

[0013] 2. Improved tensioning accuracy and stability

[0014] By combining hydraulic support rods and compression springs, the belt length changes caused by thermal expansion and contraction or wear can be automatically compensated during engine operation to maintain constant tension. The limit bolts cooperate with the limit protrusions on the swing arm to precisely limit the tension stroke and prevent the belt from skipping teeth or falling off due to overload or impact.

[0015] 3. Improved durability and reliability

[0016] The idler pulley and belt pulley are made of high-strength wear-resistant alloy steel and are hardened by carburizing and quenching, which significantly improves their wear resistance and fatigue resistance. The hydraulic support rod is equipped with a damping structure inside, which effectively absorbs the instantaneous impact during engine operation, reduces belt vibration and uneven wear, and extends the overall life of the transmission system.

[0017] 4. Adaptability and versatility

[0018] The two swing arms are symmetrically arranged around the mounting base, and can be adapted to both fan drive belts and multi-accessory drive belts. The structure is compact and the force is balanced, making it suitable for different models of high-power diesel engines, with good versatility and interchangeability.

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0020] Figure 1This is a perspective view of a specific embodiment of the present utility model;

[0021] Figure 2 A cross-sectional view of a specific embodiment of this utility model. Figure 1 ;

[0022] Figure 3 A cross-sectional view of a specific embodiment of this utility model. Figure 2 ;

[0023] Figure 4 This is a perspective view of the double-ear washer in a specific embodiment of this utility model.

[0024] Explanation of reference numerals in the attached drawings: 1. Mounting base; 2. Swing arm; 3. Idler wheel; 4. Pulley; 5. First shaft hole; 6. Second shaft hole; 7. Long bolt; 8. Hydraulic support rod; 9. Short bolt; 10. Compression spring; 11. Limiting protrusion; 12. Limiting bolt; 13. Pulley bolt; 14. Double-ear washer; 15. Limiting pull lug. Detailed Implementation

[0025] 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.

[0026] like Figure 1 — Figure 4 As shown, this embodiment discloses an integrated tensioning wheel device, including a mounting base 1, which is fixed to an engine compartment bracket by bolts. One end of the mounting base 1 is fitted with an idler wheel 3 via a bearing, and the other end has a first shaft hole 5 and a second shaft hole 6 near the idler wheel 3. The middle parts of two swing arms 2 are mounted on both sides of the second shaft hole 6 by long bolts 7. The long bolts 7 pass through double-ear washers 14 and the second shaft hole 6 and are connected to a limiting nut, so that the swing arms rotate along the long bolts 7. A bushing and a damping ring are provided in the second shaft hole 6. The double-ear washers 14 seal the end of the damping ring. Symmetrical limiting lugs 15 are provided on the outer edge of the double-ear washers 14. The limiting lugs 15 are placed in corresponding grooves on the mounting base 1 for limiting. During maintenance, the limiting lugs 15 can be pulled directly to quickly remove the long bolts 7 and prevent the double-ear washers from rotating.

[0027] The upper end of the swing arm 2 is fitted with a pulley 4 via pulley bolts 13. The bolt heads of the two pulley bolts 13 face the center of the mounting base 1 and are close to each other. The pulley 4 can rotate freely via a deep groove ball bearing. The lower end of the swing arm 2 is connected to the piston rod end of the hydraulic support rod 8 via a pin. The cylinder end of the hydraulic support rod 8 is rotatably connected to the first shaft hole 5 via a short bolt 9. A compression spring 10 is sleeved on the outside of the hydraulic support rod 8 to continuously provide outward elastic thrust during engine operation, so that the pulley 4 is always in close contact with the inner side of the belt, achieving stable tension.

[0028] The swing arm 2 has a limiting protrusion 11 formed on it, and the mounting base 1 is screwed with limiting bolts 12 that correspond one-to-one with the limiting protrusion 11. When the hydraulic support rod 8 pushes the swing arm 2 to rotate to a preset angle, the limiting protrusion 11 abuts against the end of the limiting bolt 12 to prevent over-tensioning or failure. The two swing arms 2 are symmetrically arranged about the center line of the mounting base 1, and there is a gap between the two pulleys 4. This gap is smaller than the width of the pulley 4, so that even if the belt loosens, it will not fall off the pulley bolt 13. Both the idler pulley 3 and the pulley 4 are made of high-strength wear-resistant alloy steel, and the surface is carburized and quenched to harden the surface, reaching a hardness of HRC58-62, which significantly improves wear resistance.

[0029] The hydraulic support rod 8 has an internal damping structure made of high-viscosity silicone oil and a porous piston, which can effectively absorb the instantaneous impact generated during engine operation, reduce belt vibration, and improve transmission smoothness.

[0030] This device can simultaneously tension the fan belt and multiple accessory belts, reducing the number of installation points, optimizing engine compartment space utilization, and significantly shortening assembly and maintenance time.

Claims

1. An integrated tensioning wheel device, characterized in that, The device includes a mounting base (1), two swing arms (2), an idler wheel (3), and two pulleys (4). One end of the mounting base (1) is provided with an idler wheel (3), and the other end is provided with a first shaft hole (5). A second shaft hole (6) is provided near the idler wheel (3). The middle part of the two swing arms (2) is installed on both sides of the second shaft hole (6) by long bolts (7). The upper end of the swing arms (2) is respectively equipped with rotatable pulleys (4), and the lower end is respectively connected to hydraulic support rods (8). The end of the hydraulic support rod (8) is rotatably connected to the first shaft hole (5) by short bolts (9). A compression spring (10) is provided on the hydraulic support rod (8). The swing arms (2) are provided with limit protrusions (11). The mounting base (1) is screwed with limit bolts (12) that correspond one-to-one with the limit protrusions (11). The swing arms (2) rotate under the drive of the hydraulic support rods (8), so that the limit protrusions (11) abut against the limit bolts (12).

2. The integrated tensioner pulley device of claim 1, wherein, The two swing arms (2) are arranged symmetrically with the mounting base (1) as the center. The pulley (4) is installed on the side of the swing arm (2) facing the mounting base (1) by the pulley bolt (13). There is a gap between the two pulleys (4), which is smaller than the width of the pulley (4).

3. The integrated tensioner pulley of claim 1, wherein, The long bolt (7) passes through the bushing in the second shaft hole (6) and is connected to the limit nut. A damping ring is provided between the bushing and the inner wall of the second shaft hole (6). A double-ear washer (14) is provided between the damping ring and the port of the second shaft hole. The outer edge of the double-ear washer (14) is provided with symmetrical limit pull ears (15).

4. The integrated tensioner pulley of claim 1, wherein, Both the idler wheel (3) and the pulley (4) are made of wear-resistant alloy material and the surface is hardened.

5. The integrated tensioner pulley of claim 1, wherein, The hydraulic support rod has an internal damping structure to buffer the impact load during engine operation.

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