Belt pulley and belt transmission system

Abstract

The utility model provides a belt pulley and a belt transmission system, and relates to the field of belt pulley structures. According to the belt pulley, the assembly part is arranged in the fixed disc, the outer side part of the assembly part is provided with the external thread, and the movable disc is provided with the internal thread corresponding to the external thread, namely, the movable disc can be sleeved on the outer side part of the assembly part of the fixed disc, so that accurate adjustment of the movable disc can be realized through threaded connection, and the assembly part of the fixed disc can be conveniently assembled. The relative stability between the fixed disc and the movable disc can be ensured; furthermore, a first fixing part and a second fixing part are respectively arranged at the fixed disc and the movable disc, and relative movement of the movable disc and the fixed disc can be limited through corresponding locking assemblies, so that the movable disc is locked. Therefore, the stability of the movable disc during moving and after moving is effectively improved, the coplanarity of the belt pulley and the tensioning wheel is guaranteed, the abrasion probability of the belt is effectively reduced, and the service life of the belt is prolonged.

Description

Technical Field

[0001] This application relates to the field of pulley structures, and in particular to a pulley and belt drive system. Background Technology

[0002] Pulleys are an essential component of belt drive systems. They mainly consist of a moving disc and a fixed disc. By adjusting the distance between the moving disc and the fixed disc, the diameter of the pulley can be changed, thereby adjusting the rotational speed.

[0003] like Figure 1 As shown, in existing pulleys, the distance between the moving disc and the fixed disc is achieved by the action of a moving cam, which causes the moving cam and the fixed cam to slide relative to each other, thus driving the moving disc to slide. This changes the belt drive diameter to change the rotational speed. The fixed disc remains stationary, and the change in the position of the moving disc causes a deviation between the center plane of the pulley and the driving pulley. Under this condition, long-term use will lead to belt wear and affect the belt's lifespan.

[0004] In addition, such as Figure 2 As shown, existing technologies also involve changing the distance between the moving and fixed discs by adding or removing shims between them. Similarly, changes in the position of the moving disc can cause a deviation between the center surfaces of the pulley and the driving pulley. Under this condition, long-term use can lead to belt wear and affect the belt's lifespan. Furthermore, when adjusting the moving disc, it is necessary to remove the fasteners connecting the moving and fixed discs, which is inconvenient and not precise enough. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a pulley and a belt drive system to solve the problem that the transmission surface and the driving wheel are not coplanar as the distance between the moving plate and the fixed plate changes during the adjustment process of existing pulleys; at the same time, it can also solve the problems of poor adjustment accuracy of the moving plate and the fixed plate and inconvenient operation.

[0006] In accordance with the above objectives, a first aspect of the present invention provides a pulley, wherein the pulley comprises:

[0007] A fixed plate having an assembly portion, the outer side wall of which has an external thread and a first fixing portion; the inner side wall of the assembly portion has an internal spline.

[0008] The movable disc has an internal thread that is adapted to the external thread so that it can be fitted onto the outer side of the assembly part. The movable disc also has a second fixing part that corresponds to the first fixing part.

[0009] The locking component, when the movable plate moves to a preset position, can cooperate with the first fixing part and the second fixing part to restrict the relative movement of the movable plate and the fixed plate.

[0010] Preferably, the assembling part is formed as a circular ring structure, and the external thread extends from the first end of the assembling part to the second end of the assembling part along the axial direction of the assembling part.

[0011] Preferably, the fixed disc further comprises a first disc part, which is connected with the end face of the first end of the assembling part along the axial direction of the assembling part, and which is collinear with the axial line of the assembling part.

[0012] Preferably, the movable disc comprises a sleeve corresponding to the assembling part, and the inner side wall of the sleeve is formed with the internal thread.

[0013] Preferably, the movable disc further comprises a second disc part, which is sleeved on the first end along the axial direction of the sleeve.

[0014] Preferably, the first disc part is bent towards the second end away from the axial direction of the assembling part, and the second disc part is bent towards the second end close to the axial direction of the sleeve, so that the first disc part and the second disc part form a V-shaped recess in the axial section of the pulley.

[0015] Preferably, the first fixing part comprises a plurality of limiting grooves on the outer side wall of the assembling part, and the plurality of limiting grooves are arranged at intervals along the circumferential direction of the assembling part, and each limiting groove extends towards the second end along the axial direction of the assembling part.

[0016] Preferably, the second fixing part comprises a locking screw hole provided on the outer side wall of the sleeve, and the locking screw hole penetrates into the cavity of the sleeve.

[0017] Preferably, the locking assembly comprises a locking screw corresponding to the locking screw hole and a locking nut corresponding to the locking screw; when the movable disc moves to a preset position, the locking screw is connected with the locking screw hole and abuts against the limiting groove, and the locking nut abuts against the sleeve.

[0018] According to the second aspect of the present application, a belt transmission system is provided, wherein the belt transmission system is provided with the pulley as described above; the belt transmission system further comprises a connecting shaft, the outer side wall of the connecting shaft is formed with an external spline corresponding to the internal spline, so that the pulley is correspondingly assembled on the outer side of the connecting shaft, and the pulley can move along the axial direction of the connecting shaft; the end of the connecting shaft is further provided with a limiting assembly capable of preventing the pulley from being pulled out.

[0019] The utility model discloses a pulley and belt transmission system, set up the assembly part in the fixed disc and set up the outer thread in the outside part of assembly part, and the movable disc forms the internal thread corresponding with the outer thread, namely, the movable disc can be set in the outside part of fixed disc assembly part, thereby through the thread connection, the adjustment of the distance between movable disc and fixed disc can be realized, the transmission diameter is changed, and the rotational speed is adjustable. The operation is simple and convenient, and the relative stability between the fixed disc and the movable disc can be ensured. When the movable disc and the fixed disc rotate relatively by one circle, the distance between the movable disc and the fixed disc changes by one pitch. By adjusting the thread specification, the fine degree of the distance change between the movable disc and the fixed disc is higher, and accurate control can be realized.

[0020] Further, the utility model discloses a first fixed part and second fixed part are set up at fixed disc and movable disc respectively, and then through corresponding locking assembly, the relative movement of movable disc and fixed disc can be limited to realize the locking of movable disc, and the stability of movable disc when moving and after moving is effectively increased. Meanwhile, the fixed disc is provided with internal spline, so that the pulley can slide freely on the connecting shaft matched with it. When the diameter of the pulley changes and causes the pulley and driving wheel not to be coplanar, under the action of the belt, the pulley can move along the axial direction of the connecting shaft through the internal spline, so as to be automatically adjusted to be coplanar with the driving wheel, thereby effectively reducing the wear probability of the belt and improving the service life of the belt.

[0021] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0023] Figure 1 is a sectional view of the pulley in the prior art;

[0024] Figure 2 is a sectional view of another pulley in the prior art;

[0025] Figure 3 is a partial schematic view of the fixed disc according to the embodiment of the utility model;

[0026] Figure 4 is a sectional view of the fixed disc according to the embodiment of the utility model;

[0027] Figure 5is a sectional view of a moving disc according to an embodiment of the present utility model;

[0028] Figure 6 is a schematic view of a belt pulley according to an embodiment of the present utility model.

[0029] Icon: 1- fixed disc; 11- first disc part; 12- assembly part; 13- limiting groove; 2- moving disc; 21- second disc part; 22- sleeve; 23- threaded hole; 31- tight bolt; 32- locking nut; 4- connecting shaft. DETAILED DESCRIPTION

[0030] The following detailed description is presented to aid the reader in gaining a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, various changes, modifications, and equivalents can be used, and the

[0031] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, these examples have been provided so that this disclosure will be thorough and complete, and will fully convey the scope of the methods, apparatuses, and / or systems to those skilled in the art. Further, the description should not be interpreted as implying that any particular element, feature, structure, or characteristic is essential.

[0032] Throughout the specification, when an element (such as a layer, region, or substrate) is referred to as being "on", "connected to", "coupled to", "bonds to", "bonds on", or "covers" another element, it can be directly on, connected to, coupled to, bonds to, bonds on, or cover the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on", "directly connected to", "directly coupled to", "directly bonds to", "directly on", or "directly covers" another element, there can be no other elements interposed therebetween.

[0033] As used herein, the term "and / or" includes any one of the listed items and any combination of any two or more of the listed items.

[0034] Although terms such as "first" and "second" and "third" can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, elements, components, regions, layers and / or sections referred to as first elements, components, regions, layers or sections in the examples described herein can also be referred to as second elements, components, regions, layers or sections without departing from the teachings of the examples.

[0035] For ease of description, spatial relationship terms such as "on", "upper", "under", and "lower" can be used herein to describe the relationship between one element and another element as shown in the drawings. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over, an element described as being "on" or "upper" relative to another element would then be oriented "under" or "lower" relative to the other element. Accordingly, the term "on" encompasses both an "on" and "under" orientation depending on the spatial orientation of the device. The device can be oriented in other ways (e.g., rotated 90 degrees or at other orientations) and an appropriate modification to the spatial relationship terms used herein will be made accordingly.

[0036] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has", "having" as used herein, are specifically intended to be construed as open-ended terms, i.e., to mean that the listed steps, components, elements, members, operations, etc. are present, but not excluding the presence of one or more other steps, components, elements, members, operations, etc.

[0037] Variations in the shapes of the elements shown in the drawings can occur as a result of manufacturing processes and / or tolerances. Thus, the examples described herein are not limited to the specific shapes of the elements shown in the drawings, but include variations in shapes that would occur as a result of manufacturing processes.

[0038] The features of the examples described herein can be combined in a variety of ways as will be apparent after review of the disclosure. Also, while the examples described herein have a variety of configurations, other configurations are possible.

[0039] According to a first aspect of the present application, there is provided a belt pulley, such as Figures 3 to 6As shown, the pulley in this embodiment includes a fixed disc 1 and a movable disc 2, which are connected by threads, thereby enabling stable movement of the movable disc 2 (relative to the fixed disc 1). When the movable disc 2 moves to a preset position, a locking assembly locks the movable disc 2 to the fixed disc 1, effectively ensuring the relative stability of the movable disc 2 and the fixed disc 1. The specific connection and positional relationships of the various components of the pulley according to this invention will be described in detail below.

[0040] In this embodiment, as Figures 3 to 4 As shown, the fixed plate 1 has an assembly portion 12 and a first disc portion 11 connected to the assembly portion 12. Specifically, the assembly portion 12 is formed as an annular structure, and along the axial direction of the assembly portion 12, the external thread extends from the first end of the assembly portion 12 to the second end of the assembly portion 12. Figure 3 (Not shown in the diagram), that is, the moving disc 2 moves along the axial direction of the assembly part 12 (the specifications of the assembly part 12 should be determined comprehensively based on actual conditions, such as the adjustment range of the pulley). Furthermore, along the axial direction of the assembly part 12, the first disc part 11 is connected to the end face of the first end of the assembly part 12, and the axes of the first disc part 11 and the assembly part 12 are collinear, thus ensuring the stability of the overall structure of the fixed disc 1. It should be noted that the connection method between the first disc part 11 and the assembly part 12 is not fixed; for example, the fixed disc 1 can be manufactured by welding or integral molding, as long as the above-mentioned technical effect can be achieved.

[0041] In this embodiment, as Figure 5 As shown, the movable disk 2 has a sleeve 22 and a second disc portion 21 connected to the sleeve 22. Specifically, the sleeve 22 is adapted to the assembly portion 12, and the inner wall of the sleeve 22 has an internal thread corresponding to the external thread. The second disc portion 21 is sleeved on the first end of the sleeve 22 in the axial direction, and the second disc portion 21 and the sleeve 22 can be assembled by welding, integral molding, or other methods. In this way, the movable disk 2 is mounted on the fixed disk 1 from the second end of the assembly portion 12, and the movable disk 2 can move stably relative to the fixed disk 1 through the threaded engagement.

[0042] Furthermore, such as Figure 6 As shown, the first disc portion 11 is bent toward a second end away from the axis of the assembly portion 12, while the second disc portion 21 is bent toward a second end close to the axis of the sleeve 22. This results in V-shaped recesses (which are the belt grooves) formed in the axial section of the pulley, facilitating stable belt assembly. It should be noted that the specifications of the moving disc 2 and the fixed disc 1 are not fixed, as long as the pulley's usage requirements and the aforementioned technical effects are met. Furthermore, the first disc portion 11 and the second disc portion 21 are bent in the following ways:Figure 6 The recess formed in the illustrated state is in a V-shaped structure; when the movable disc 2 moves, in cross section, the extension lines of the first disc part 11 and the second disc part 21 are staggered to present a V-shaped structure.

[0043] In the present embodiment, as shown, Figures 3 to 5 The fixed disc 1 is further formed with a first fixing part comprising a plurality of limiting grooves 13 on the outer side wall of the assembly part 12, the plurality of limiting grooves 13 are arranged in the circumferential direction of the assembly part 12, and each limiting groove 13 extends towards the second end of the assembly part 12 in the axial direction (in the present embodiment, each limiting groove 13 penetrates the second end of the assembly part 12 in the axial direction). Correspondingly, the movable disc 2 is formed with a second fixing part comprising a plurality of tightening screw holes 23 provided on the outer side wall of the sleeve 22, and the tightening screw holes 23 penetrate into the cavity of the sleeve 22. In addition, the pulley is further provided with a locking assembly comprising a tightening bolt 31 corresponding to the tightening screw hole 23 and a locking nut 32 corresponding to the tightening bolt 31; when the movable disc 2 moves to a predetermined position, the tightening bolt 31 is connected to the tightening screw hole 23 and abuts against the limiting groove 13, and the locking nut 32 abuts against the sleeve 22. That is, through the cooperation of the locking assembly, the first fixing part and the second fixing part, the secondary locking of the movable disc 2 can be realized, so as to further improve the relative stability of the movable disc 2 and the fixed disc 1, thereby preventing the relative rotation of the movable disc 2 and the fixed disc 1.

[0044] It should be noted that the specifications, number and spacing of the limiting grooves 13 are not specifically limited, and should be determined comprehensively according to actual conditions such as the specifications of the external threads of the assembly part 12, etc., as long as the above technical effects can be achieved. In addition, the limiting grooves 13 are arranged at intervals, which is beneficial to expand the adjustment range of the movable disc 2.

[0045] However, it is not limited thereto, and the locking assembly can also be formed as a member such as a pin, which can realize the secondary locking of the movable disc 2 through interference fit.

[0046] In the embodiment, although not shown in the figure, an inner spline is further fixedly arranged on the inner side wall of the assembly portion 12 of the fixed disc 1; correspondingly, an outer spline corresponding to the inner spline is arranged on the outer side wall of the connecting shaft 4 corresponding to the belt pulley, and the outer spline extends along the axial direction of the connecting shaft. In this way, the belt pulley is assembled on the outer side portion of the connecting shaft 4 (i.e. the fixed disc 1 is sleeved on the outer side portion of the connecting shaft 4, and the movable disc 2 is sleeved on the outer side portion of the fixed disc 1) through the inner and outer splines, and the belt pulley can freely move along the axial direction of the connecting shaft based on the cooperation of the inner and outer splines, and the rotation of the belt pulley as a whole relative to the connecting shaft 4 is limited. In this way, when the diameter of the belt pulley changes and causes the belt pulley to be not coplanar with the driving pulley, under the action of the belt, the belt pulley can move along the axial direction of the connecting shaft through the cooperation of the inner and outer splines, so as to be automatically adjusted to be coplanar with the driving pulley.

[0047] According to the belt pulley of the utility model, the assembly portion 12 is arranged in the fixed disc 1, and the outer thread is arranged on the outer side portion of the assembly portion 12, and the movable disc 2 is formed with the inner thread corresponding to the outer thread, that is, the movable disc 2 can be sleeved on the outer side portion of the assembly portion 12 of the fixed disc 1, so that the adjustment of the distance between the movable disc 2 and the fixed disc 1 can be realized through the threaded connection to change the transmission diameter, so that the rotational speed can be adjusted. The arrangement makes the operation more simple and convenient, and also ensures the relative stability between the fixed disc 1 and the movable disc 2; and when the movable disc 2 and the fixed disc 1 rotate relatively by one turn, the distance between them changes by one pitch, and by adjusting the thread specification, the fine degree of the distance change between the movable disc 2 and the fixed disc 1 can be higher, that is, accurate control can be realized.

[0048] Further, the first fixing portion and the second fixing portion are arranged at the fixed disc 1 and the movable disc 2 respectively, and the relative movement of the movable disc 2 and the fixed disc 1 can be limited through the corresponding locking assembly to realize the locking of the movable disc 2. In this way, the stability of the movable disc 2 during movement and after movement is effectively increased; and through the arrangement of the inner spline, when the diameter of the belt pulley changes and causes the belt pulley to be not coplanar with the driving pulley, under the action of the belt, the belt pulley can move along the axial direction of the connecting shaft through the inner spline, so as to be automatically adjusted to be coplanar with the driving pulley, thereby ensuring the coplanarity of the belt pulley and the tension pulley, effectively reducing the wear probability of the belt, and improving the service life of the belt.

[0049] According to the second aspect of the utility model discloses a belt drive system, the belt drive system is provided with the pulley described above, the belt drive system still includes the connecting shaft 4, the outer side wall of connecting shaft 4 is formed with the outer spline corresponding with the inner spline adaptation, to make the pulley corresponding assembly in the outer side portion of connecting shaft 4, and the pulley can be moved along the axis direction of connecting shaft 4.In addition, the end of connecting shaft 4 is also provided with the limiting assembly that can prevent the pulley to come out, the limiting assembly in this embodiment can include the nut corresponding with connecting shaft 4 connection, flat pad and elastic pad.

[0050] Finally, it should be noted that: the above-described embodiments, only for the specific embodiments of the present application, to illustrate the technical solutions of the present application, rather than limit it, the protection scope of the present application is not limited to this, although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand: any familiar with the technical field of the technical person in the technical range disclosed in the present application, it still can be modified or easily thought of changes to the technical solution recorded in the foregoing examples, or equivalent replacement to part of the technical features, and these modifications, changes or replacement, do not make the corresponding technical solution of the essence deviate from the spirit and scope of the technical solution of the embodiments of the present application, all should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be the protection scope of the claims.

Claims

1. A pulley, characterized by, The pulley comprises: a fixed disc, which is formed with an assembly part, an outer side wall of the assembly part is formed with an external thread and a first fixing part; an inner side wall of the assembly part is provided with an internal spline; a movable disc, which is formed with an internal thread corresponding to the external thread, so as to be correspondingly sleeved on the outer side of the assembly part, and is further formed with a second fixing part corresponding to the first fixing part; a locking assembly, which can cooperate with the first fixing part and the second fixing part to limit the relative movement of the movable disc and the fixed disc when the movable disc moves to a preset position.

2. The pulley of claim 1, wherein The assembly part is formed in a circular ring structure, and the external thread extends from a first end of the assembly part to a second end of the assembly part along the axial direction of the assembly part.

3. The pulley of claim 2, wherein The fixed disc further comprises a first disc part, which is connected with the end face of the first end of the assembly part along the axial direction of the assembly part, and is collinear with the axis of the assembly part.

4. The pulley of claim 3, wherein The movable disc comprises a sleeve corresponding to the assembly part, and an inner side wall of the sleeve is formed with the internal thread.

5. The pulley of claim 4, wherein The movable disc further comprises a second disc part, which is sleeved on the first end in the axial direction of the sleeve.

6. The pulley of claim 5, wherein The first disc part is bent towards the second end away from the axial direction of the assembly part, and the second disc part is bent towards the second end close to the axial direction of the sleeve, so that the first disc part and the second disc part form a V-shaped recess in the axial cross section of the pulley.

7. The pulley of claim 4, wherein The first fixing part comprises a plurality of limiting grooves on the outer side wall of the assembly part, and the plurality of limiting grooves are arranged at intervals along the circumferential direction of the assembly part, and each limiting groove extends towards the second end in the axial direction of the assembly part.

8. The pulley of claim 7, wherein The second fixing part comprises a locking thread hole provided on the outer side wall of the sleeve, which penetrates into the cavity of the sleeve.

9. The pulley of claim 8, wherein The locking assembly comprises a locking stud corresponding to the locking thread hole and a locking nut corresponding to the locking stud; when the movable disc moves to the preset position, the locking stud is correspondingly connected with the locking thread hole and abuts against the limiting groove, and the locking nut abuts against the sleeve.

10. A belt drive system characterized by, The belt transmission system is provided with the pulley according to any one of claims 1 to 9; the belt transmission system further comprises a connecting shaft, an outer side wall of the connecting shaft is formed with an external spline corresponding to the internal spline, so that the pulley is correspondingly assembled on the outer side of the connecting shaft, and the pulley can move along the axial direction of the connecting shaft; an end part of the connecting shaft is further provided with a limiting assembly capable of preventing the pulley from being pulled out.

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