A high torque belt drive assembly

Abstract

The embodiment of the application provides a high-torque belt transmission assembly, comprising a box seat and a box cover, the box seat and the box cover jointly defining a containing space between them, the containing space being provided with a first toothed belt pulley, a second toothed belt pulley and a toothed belt, the toothed belt drivingly connecting the first toothed belt pulley and the second toothed belt pulley; a guide sliding block is arranged on the wheel shaft of the first toothed belt pulley and / or the second toothed belt pulley, the guide sliding block being used to provide a mutual pushing force away from each other to the first toothed belt pulley and / or the second toothed belt pulley, so as to realize automatic tensioning of the toothed belt, the structure being simple and labor-saving in installation, and high-torque reliable transmission being realized; a maintenance-free bearing is mounted on the wheel shaft of the first toothed belt pulley and the second toothed belt pulley, an additional lubrication and cooling system not being needed, the structure being simple and reliable, and being beneficial to post-maintenance.

Description

Technical Field

[0001] This invention relates to the field of mechanical transmission technology, and more specifically to a high-torque belt drive assembly. Background Technology

[0002] Outboard motors are propulsion engines mounted on the outside of the hull, typically suspended on the outside of the stern plate. They are highly integrated, easy to install and maintain, making them the preferred power source for personal recreational boats. However, most mainstream outboard motors on the market are vertical-shaft gasoline engines. Developing outboard motors with different power outputs requires simultaneously developing both the gasoline engine and the transmission system, resulting in significant development costs and numerous technical challenges.

[0003] From the perspective of saving development costs, a conventional gasoline or diesel engine could be used, horizontally mounted on the outboard motor, and its high torque reliably transmitted to the gearbox below the outboard motor via a transmission structure. Currently, the most common method of engine torque transmission is direct-drive gearbox, but due to the structural limitations of the outboard motor itself, this direct-drive gearbox solution is difficult to implement for outboard motors. Summary of the Invention

[0004] Embodiments of the present invention provide a high-torque belt drive assembly capable of reliably transmitting high torque from a high-power engine.

[0005] An embodiment of the present invention provides a high-torque belt drive assembly, including a housing and a housing cover detachably connected to the housing. The housing and the housing cover together define an accommodating space located between them. A first toothed pulley, a second toothed pulley, and a toothed belt are disposed in the accommodating space. The toothed belt is engaged with the first toothed pulley and the second toothed pulley to drive the first toothed pulley and the second toothed pulley. The first toothed pulley has a guide slider on its axle to apply a thrust to the first toothed pulley away from the second toothed pulley, and / or the second toothed pulley has a guide slider on its axle to apply a thrust to the second toothed pulley away from the first toothed pulley.

[0006] Optionally, the inner sides of the housing base and the housing cover are provided with a first positioning groove for installing the first toothed pulley and a second positioning groove for installing the second toothed pulley; bearings are installed at both ends of the axles of the first toothed pulley and the second toothed pulley; The guide slider is press-fitted to the outer ring of the bearing of the first toothed pulley. The outer ring of the guide slider has an outer conical surface for guiding. The first positioning groove has an inner conical surface that matches the outer conical surface. And / or, the guide slider is press-fitted to the outer ring of the bearing of the second toothed pulley, the outer ring of the guide slider is formed with an outer conical surface for guiding, and the second positioning groove is provided with an inner conical surface adapted to the outer conical surface.

[0007] Optionally, the distance between the center of the first positioning groove and the center of the second positioning groove is the center distance of the toothed belt under theoretical tension.

[0008] Optionally, the housing base and / or the housing cover are provided with through holes coaxially arranged with the first toothed pulley and the second toothed pulley.

[0009] Optionally, the first toothed pulley and the second toothed pulley have a socket hole coaxially arranged on their axles, and the socket hole is provided with an internal spline for transmission with a rotating shaft.

[0010] Optionally, the first toothed pulley and the second toothed pulley are provided with limiting flanges in the circumferential direction to prevent the toothed belt from slipping off.

[0011] Optionally, the toothed belt is a high-strength toothed belt with built-in high-strength yarns.

[0012] Optionally, the bearing is a maintenance-free bearing.

[0013] The embodiments of the present invention have the following beneficial effects: 1. A first toothed pulley, a second toothed pulley, and a toothed belt are installed inside the housing. The toothed belt drives the first toothed pulley and the second toothed pulley. A guide slider is installed on the axle of the first toothed pulley and / or the second toothed pulley. The guide slider provides a pushing force that moves away from each other to the first toothed pulley and / or the second toothed pulley, thereby realizing the automatic tensioning of the toothed belt. The structure is simple and easy to install, while achieving reliable transmission of high torque. 2. It adopts a dry structure, with maintenance-free bearings installed on the axles of the first and second toothed pulleys. No additional lubrication and cooling systems are required, making the structure simple, reliable, and easy to maintain in the future. 3. The modular design allows the first and second toothed pulleys to be set to the same or different numbers of teeth. Different tooth counts can achieve independent speed ratios for the belt drive assembly, and the two speed ratios can be achieved by swapping them. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the guide slider in an embodiment of the present invention; The numbers in the diagram represent: 1. Box base; 2. Box cover; 3. First toothed pulley; 4. Second toothed pulley; 5. Toothed belt; 6. Limiting flange; 7. Guide slider; 8. First positioning groove; 9. Second positioning groove; 10. Bearing; 11. Outer conical surface; 12. Inner conical surface; 13. Through hole; 14. Insertion hole; 15. Internal spline. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "inner", "outer", "axial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limiting this invention.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0019] Please see Figure 1As shown, an embodiment of the present invention provides a high-torque belt drive assembly, including a housing 1 and a housing cover 2 adapted to the housing 1. The housing cover 2 is detachably connected to the housing 1 by means of bolts or the like. The housing 1 and the housing cover 2 together define an accommodating space between them. A first toothed pulley 3, a second toothed pulley 4 and a toothed belt 5 are provided in the accommodating space. The toothed belt 5 is meshed with the first toothed pulley 3 and the second toothed pulley 4, thereby drivingly connecting the first toothed pulley 3 and the second toothed pulley 4.

[0020] By connecting two rotating shafts (such as the output shaft of an engine and the input shaft of a gearbox) to the first toothed pulley 3 and the second toothed pulley 4 respectively, rotational power can be transmitted from one driving shaft to the other driven shaft via the first toothed pulley 3, the second toothed pulley 4, and the toothed belt 5. The toothed belt 5 can be a commercially available high-strength toothed belt with built-in high-strength fibers that will not stretch throughout its lifespan, thus eliminating the need for an additional automatic tensioning device. A limiting flange 6 can also be provided circumferentially on the first toothed pulley 3 and the second toothed pulley 4 to prevent the toothed belt 5 from slipping during transmission. The first toothed pulley 3 and the second toothed pulley 4 can be configured with the same or different numbers of teeth. Different tooth counts allow for independent speed ratios in the belt drive assembly; swapping them allows for both speed ratios. This modular design makes the belt drive assembly highly versatile and can save development costs to some extent.

[0021] A guide slider 7 is provided on the axle of the first toothed pulley 3. This guide slider 7 is configured to apply a thrust to the first toothed pulley 3, moving it away from the second toothed pulley 4. And / or, a guide slider 7 is provided on the axle of the second toothed pulley 4, also configured to apply a thrust to the second toothed pulley 4, moving it away from the first toothed pulley 3. In other words, a guide slider 7 is provided on the axle of at least one of the first toothed pulley 3 and the second toothed pulley 4 to provide a thrust that moves the two pulleys away from each other, thereby achieving automatic tensioning of the toothed belt 5. This design is simple in structure, requires little effort to install, and enables reliable transmission of high torque.

[0022] Specifically, in this embodiment, a first positioning groove 8 for mounting the first toothed pulley 3 and a second positioning groove 9 for mounting the second toothed pulley 4 are provided on the inner sides of the housing 1 and the housing cover 2. Bearings 10 are mounted at both ends of the axles of the first toothed pulley 3 and the second toothed pulley 4. Furthermore, a guide slider 7 is press-fitted and fixed to the outer ring of the bearing 10 of the first toothed pulley 3 and / or the outer ring of the bearing 10 of the second toothed pulley 4. The outer ring of the guide slider 7 forms an outer conical surface 11 for guidance (e.g., ...). Figure 2As shown), the first positioning groove 8 and / or the second positioning groove 9 are provided with an inner conical surface 12 that is adapted to the outer conical surface 11.

[0023] During installation, first assemble the first toothed pulley 3, the second toothed pulley 4, the toothed belt 5, the bearing 10, and the guide slider 7. At this time, the toothed belt 5 is in a slack state. Then, place the assembled first toothed pulley 3 and the second toothed pulley 4 into the first positioning groove 8 and the second positioning groove 9, respectively. As the bolts are tightened, the housing 1 and the housing cover 2 gradually press and fit together (refer to...). Figure 1 (As indicated by the arrow in the image), the guide slider 7 can be guided and aligned by the outer conical surface 11 and the inner conical surface 12, and sit in and fit into the first positioning groove 8 and / or the second positioning groove 9, thereby driving the first toothed pulley 3 away from the second toothed pulley 4 and / or driving the second toothed pulley 4 away from the first toothed pulley 3, so as to tighten the toothed belt 5; the distance L between the center of the first positioning groove 8 and the center of the second positioning groove 9 is the center distance of the toothed belt 5 under the theoretical tension state, so that when the first toothed pulley 3 and the second toothed pulley 4 are installed in the corresponding first positioning groove 8 and second positioning groove 9, the toothed belt 5 can be in a tension state.

[0024] Furthermore, in this embodiment, at least one of the housing 1 and the housing cover 2 has a through hole 13 coaxially arranged with the first toothed pulley 3 and the second toothed pulley 4, so that rotating shafts such as the engine output shaft and the gearbox input shaft can pass through the through hole 13 and be connected to the corresponding first toothed pulley 3 and second toothed pulley 4 for transmission. As an optional transmission connection method, in this embodiment, the axles of the first toothed pulley 3 and the second toothed pulley 4 have insertion holes 14 coaxially arranged with them (that is, both the through hole 13 and the insertion hole 14 are coaxially arranged with the corresponding first toothed pulley 3 and second toothed pulley 4), and an internal spline 15 is provided in the insertion hole 14, so that the rotating shaft can pass through the through hole 13 and be inserted into the corresponding first toothed pulley 3 and second toothed pulley 4, and be driven by the internal spline 15.

[0025] Furthermore, all bearings 10 in this embodiment are maintenance-free bearings. Maintenance-free bearings refer to rolling bearings that can work stably for a long time without maintenance from installation to failure. They have excellent properties such as maintenance-free operation, high performance, long life, environmental friendliness, and reliability and durability. This makes the belt drive assembly provided in this embodiment unnecessary to set up an additional lubrication and cooling system, with a simple and reliable structure, which is beneficial for later maintenance.

[0026] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of the present invention. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-torque belt drive assembly, characterized in that: The device includes a base and a cover detachably connected to the base. The base and the cover together define an accommodating space between them. A first toothed pulley, a second toothed pulley, and a toothed belt are provided in the accommodating space. The toothed belt is engaged with the first toothed pulley and the second toothed pulley to drive the first toothed pulley and the second toothed pulley. A guide slider is provided on the axle of the first toothed pulley to apply a thrust to the first toothed pulley to move it away from the second toothed pulley, and / or, a guide slider is provided on the axle of the second toothed pulley to apply a thrust to the second toothed pulley to move it away from the first toothed pulley; The inner sides of the housing base and the housing cover are provided with a first positioning groove for installing the first toothed pulley and a second positioning groove for installing the second toothed pulley; bearings are installed at both ends of the axles of the first toothed pulley and the second toothed pulley. The guide slider is press-fitted to the outer ring of the bearing of the first toothed pulley. The outer ring of the guide slider has an outer conical surface for guiding. The first positioning groove has an inner conical surface that matches the outer conical surface. And / or, the guide slider is press-fitted to the outer ring of the bearing of the second toothed pulley, the outer ring of the guide slider is formed with an outer conical surface for guiding, and the second positioning groove is provided with an inner conical surface adapted to the outer conical surface.

2. The high-torque belt drive assembly according to claim 1, characterized in that: The distance between the center of the first positioning groove and the center of the second positioning groove is the center distance of the toothed belt under theoretical tension.

3. The high-torque belt drive assembly according to claim 1, characterized in that: The housing base and / or the housing cover are provided with through holes that are coaxially arranged with the first toothed pulley and the second toothed pulley.

4. A high-torque belt drive assembly according to claim 3, characterized in that: The first toothed pulley and the second toothed pulley have insertion holes coaxially arranged on their axles, and internal splines for transmission with rotating shafts are provided in the insertion holes.

5. A high-torque belt drive assembly according to claim 1, characterized in that: The first toothed pulley and the second toothed pulley are provided with limiting flanges in the circumferential direction to prevent the toothed belt from slipping off.

6. A high-torque belt drive assembly according to claim 1, characterized in that: The toothed belt is a high-strength toothed belt with built-in high-strength yarn.

7. A high-torque belt drive assembly according to any one of claims 1-6, characterized in that: The bearing is a maintenance-free bearing.

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