Speed change belt wheel and speed change system

Abstract

The utility model provides a speed change belt wheel and a speed change system, the speed change belt wheel comprises a first wheel disc and a second wheel disc, the first wheel disc is provided with a first conical surface and a groove, the second wheel disc is provided with a first annular boss and a second conical surface, the second wheel disc can move relative to the first wheel disc along the axis direction of the second wheel disc, and the first annular boss extends into the groove. An annular flange is arranged on the outer side wall of the first annular boss. And a belt groove with variable groove width is formed between the second conical surface and the first conical surface. When a transmission belt is wound on the outer side wall of the first annular boss, the annular flange can limit the position of the transmission belt on the first annular boss, so that the transmission belt cannot be separated from the first annular boss, and the transmission belt is prevented from making contact with the first wheel disc fixed to the output shaft in the neutral position (namely, the output shaft cannot drive the second wheel disc to rotate); and the phenomenon that the driving belt drives the driven shaft to actively rotate is avoided. The utility model further provides a speed change system which comprises the speed change belt wheel.

Description

Technical Field

[0001] The utility model relates to the technical field of lawn mower transmission structures, in particular to a speed-changing pulley and a speed-changing system. Background Art

[0002] Riding lawn mowers are mechanical tools commonly used for pruning and maintaining lawns and vegetation. They are mainly used in garden decoration pruning, lawn greening pruning, urban streets, green scenic spots, garden pruning, field weeding and other fields. This type of lawn mower generally adopts two speed change modes: manual mode and hydraulic mode, as follows:

[0003] Manual mode: It is to achieve different speeds of the whole vehicle by manually switching the gearbox gears and executing different gears. Such a gearbox is relatively complex, occupies a large space, and has a high cost. At the same time, the impact force components are large when shifting gears, and there is a sense of frustration.

[0004] Hydraulic mode: The hydraulic pump and gears in the hydraulic control mechanism and hydraulic transmission enable the vehicle to achieve different speeds. This mechanism has high precision requirements, high costs, complex control mechanisms, and large space requirements.

[0005] In order to solve the technical problems existing in the manual mode and hydraulic mode, some lawn mowers currently use a continuously variable transmission system. This speed change method is more accurate and smoother than the traditional clutch speed change. The continuously variable transmission system uses a continuously variable transmission ratio and achieves speed change by changing the transmission ratio. However, the speed change pulley in the existing continuously variable transmission system generally uses a fixed wheel and a movable wheel. The diameter of the transmission belt in the speed change pulley is changed by changing the groove width of the two wheels; when the lawn mower is in neutral, the transmission belt is easy to contact with the fixed wheel, causing the transmission belt to drive the driven shaft to rotate, which also poses certain safety hazards. Utility Model Content

[0006] In view of the defects in the prior art, the purpose of the utility model is to provide a speed change pulley and a speed change system, so as to avoid the contact between the transmission belt and the first wheel disc when in neutral.

[0007] In order to achieve the above-mentioned purpose, the utility model provides a variable speed pulley, including a first wheel disc, provided with a first conical surface and a groove which are collinear with its own axis, and the first conical surface is arranged outside the groove; and a second wheel disc, provided with a first annular boss and a second conical surface which are collinear with its own axis, the axis of the second wheel disc is collinear with the axis of the first wheel disc, the second wheel disc can move relative to the first wheel disc along the direction of its own axis, the first annular boss extends into the groove, and the outer side wall of the first annular boss is provided with an annular flange; the second conical surface is arranged outside the first annular boss, and a belt groove with a variable groove width is formed between the second conical surface and the first conical surface.

[0008] Preferably, the annular flange is provided on the end surface of the first annular boss.

[0009] Preferably, a first through hole colinear with the groove axis is provided at the bottom of the groove, and an edge of the first through hole extends toward the second wheel disc to form a second annular boss, and the second annular boss extends into the first annular boss.

[0010] Preferably, the second wheel disc is provided with a second through hole colinear with its own axis, the first annular boss is arranged outside the second through hole, and the edge of the second through hole extends away from the first wheel disc to form a third annular boss.

[0011] Preferably, a plurality of first reinforcing ribs are provided on a side of the first wheel disc facing away from the second wheel disc.

[0012] Preferably, a fourth annular boss is provided on a side of the second wheel disc facing away from the first wheel disc, the fourth annular boss is arranged outside the third annular boss, and the axis of the fourth annular boss is colinear with the axis of the third annular boss.

[0013] Preferably, a plurality of second reinforcing ribs are provided on a side of the second wheel disc facing away from the first wheel disc.

[0014] Preferably, the second reinforcing rib is connected to the outer side wall of the fourth annular boss.

[0015] The utility model also provides a speed change system, comprising the speed change pulley mentioned above.

[0016] Beneficial effects of the utility model:

[0017] The utility model discloses a speed-changing pulley, which designs an annular flange on the outer side wall of a first annular boss. When the transmission belt is wound around the outer side wall of the first annular boss, the annular flange can limit the position of the transmission belt on the first annular boss, so that the transmission belt cannot be separated from the first annular boss, thereby avoiding the transmission belt from contacting the first wheel disk fixed on the output shaft when the gear is in neutral (that is, the output shaft will not drive the second wheel disk to rotate), thereby avoiding the phenomenon that the transmission belt drives the driven shaft to actively rotate.

[0018] The utility model discloses a speed changing system which ensures the stability and safety of the lawn mower during use by using the speed changing pulley. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0020] Figure 1 A schematic diagram of the structure of a speed-changing pulley provided in one embodiment of the utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the cross section under the state;

[0022] Figure 3 It is a schematic diagram of the structure of the first roulette wheel;

[0023] Figure 4 is a schematic diagram of the structure of the second wheel;

[0024] Figure 5 It is a schematic diagram of the structure on the other side of the first wheel;

[0025] Figure 6 It is a schematic diagram of the structure on the other side of the second wheel;

[0026] Figure 7 It is a cross-sectional schematic diagram of the cooperation between the first wheel disc, the second wheel disc and the output shaft;

[0027] Reference numerals:

[0028] 10. First wheel disc; 11. First conical surface; 12. Groove; 13. First through hole; 14. Second annular boss; 15. First reinforcing rib; 20. Second wheel disc; 21. First annular boss; 22. Second conical surface; 23. Annular flange; 24. Second through hole; 25. Third annular boss; 26. Fourth annular boss; 27. Second reinforcing rib; 30. Groove; 40. Output shaft; 50. Bearing; 60. Lifting seat. DETAILED DESCRIPTION

[0029] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0030] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present utility model, the meaning of "plurality" is more than two, unless otherwise clearly and specifically limited.

[0033] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] Embodiment 1

[0036] like Figure 1-7As shown, in one embodiment of the utility model, a variable speed pulley is provided, including a first wheel disc 10 and a second wheel disc 20. The first wheel disc 10 is provided with a first conical surface 11 and a groove 12 which are collinear with its own axis, and the first conical surface 11 is arranged outside the groove 12. The second wheel disc 20 is provided with a first annular boss 21 and a second conical surface 22 which are collinear with its own axis. The axis of the second wheel disc 20 is collinear with the axis of the first wheel disc 10. The first wheel disc 10 is fixed on the output shaft 40, and the second wheel disc 20 can move relative to the first wheel disc 10 along the direction of its own axis. The first annular boss 21 extends into the groove 12, and the outer side wall of the first annular boss 21 is provided with an annular flange 23. The second conical surface 22 is arranged outside the first annular boss 21, and a belt groove 30 with a variable groove width is formed between the second conical surface 22 and the first conical surface 11.

[0037] When the external lifting actuator (not shown in the drawings) drives the second wheel disc 20 to move relative to the first wheel disc 10, if the width of the belt groove 30 becomes smaller, the diameter of the transmission belt in the belt groove 30 will become larger. Correspondingly, if the width of the belt groove 30 becomes larger, the diameter of the transmission belt in the belt groove 30 will become smaller. In this way, the acceleration or deceleration of the lawn mower can be controlled.

[0038] The present embodiment discloses a variable speed pulley, which is designed with an annular flange 23 on the outer side wall of the first annular boss 21. When the transmission belt is wrapped around the outer side wall of the first annular boss 21, the annular flange 23 can limit the position of the transmission belt on the first annular boss 21, so that the transmission belt cannot be separated from the first annular boss 21, thereby avoiding the transmission belt from contacting the first wheel 10 fixed to the output shaft 40 when the gear is in neutral (that is, the output shaft 40 does not drive the second wheel 20 to rotate), thereby avoiding the phenomenon that the transmission belt drives the driven shaft to actively rotate.

[0039] In one embodiment, in order to increase the effective contact width between the transmission belt and the outer side wall of the first annular boss 21 , the annular flange 23 is provided on the end surface of the first annular boss 21 .

[0040] In one embodiment, the bottom of the groove 12 is provided with a first through hole 13 colinear with the axis thereof, and the edge of the first through hole 13 extends toward the second wheel disc 20 to form a second annular boss 14, and the second annular boss 14 extends into the first annular boss 21. By designing the second annular boss 14 on the first wheel disc 10, the first wheel disc 10 is sleeved on the output shaft 40 by using the first through hole 13 and the second annular boss 14, so that during the assembly process, it is convenient to fix the first wheel disc 10 on the output shaft 40 to realize the installation of the first wheel disc 10.

[0041] In one embodiment, the second wheel disc 20 has a second through hole 24 colinear with its own axis, the first annular boss 21 is disposed outside the second through hole 24 , and the edge of the second through hole 24 extends away from the first wheel disc 10 to form a third annular boss 25 .

[0042] During the assembly process, the output shaft 40 will pass through the first annular boss 21, the second through hole 24 and the third annular boss 25, and the output shaft 40 will not contact the first annular boss 21, the second through hole 24 and the third annular boss 25. The second wheel disc 20 is mounted on the lifting seat 60 through the third annular boss 25 and the bearing 50, that is, the second wheel disc 20 and the lifting seat 60 are rotationally matched. When the lifting actuator drives the lifting seat 60 to move along the axial direction of the output shaft 40, the second wheel disc 20 will be driven to move relative to the first wheel disc 10, so as to adjust the slot width of the belt slot 30.

[0043] In one embodiment, in order to improve the overall structural strength of the first wheel disc 10 , a plurality of first reinforcing ribs 15 are provided on a side of the first wheel disc 10 facing away from the second wheel disc 20 .

[0044] In one embodiment, a fourth annular boss 26 is provided on the side of the second wheel disc 20 facing away from the first wheel disc 10. The fourth annular boss 26 is arranged outside the third annular boss 25, and the axis of the fourth annular boss 26 is colinear with the axis of the third annular boss 25. When the second wheel disc 20, the bearing 50 and the lifting seat 60 are assembled, the fourth annular boss 26 is arranged outside the bearing 50, so that the bearing 50 can be shielded to a certain extent to prevent impurities from entering.

[0045] In one embodiment, in order to improve the overall structural strength of the second wheel disc 20 , a plurality of second reinforcing ribs 27 are provided on the side of the second wheel disc 20 facing away from the first wheel disc 10 , and the second reinforcing ribs 27 are connected to the outer side wall of the fourth annular boss 26 .

[0046] Embodiment 2

[0047] In another embodiment of the utility model, a speed change system is provided, including the speed change pulley in the above-mentioned embodiment 1. By using the above-mentioned speed change pulley, the stability and safety of the lawn mower during use are ensured.

[0048] In the specification of the present utility model, a lot of specific details are described. However, it is understood that the embodiments of the present utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A speed-changing pulley, characterized in that: include: A first wheel disc (10) is provided with a first conical surface (11) and a groove (12) which are colinear with the first wheel disc axis, wherein the first conical surface (11) is arranged outside the groove (12); and The second wheel disc (20) is provided with a first annular boss (21) and a second conical surface (22) which are colinear with the axis of the second wheel disc (20). The axis of the second wheel disc (20) is colinear with the axis of the first wheel disc (10). The second wheel disc (20) can move relative to the first wheel disc (10) along the direction of its own axis. The first annular boss (21) extends into the groove (12). The outer side wall of the first annular boss (21) is provided with an annular flange (23). The second conical surface (22) is arranged outside the first annular boss (21). A groove (30) with a variable groove width is formed between the second conical surface (22) and the first conical surface (11).

2. The speed change pulley according to claim 1, characterized in that: The annular flange (23) is arranged on the end surface of the first annular boss (21).

3. The speed change pulley according to claim 1, characterized in that: The bottom of the groove (12) is provided with a first through hole (13) colinear with the axis of the groove, the edge of the first through hole (13) extends toward the second wheel disc (20) to form a second annular boss (14), and the second annular boss (14) extends into the first annular boss (21).

4. The speed-changing pulley according to claim 1, characterized in that: The second wheel disc (20) is provided with a second through hole (24) colinear with its own axis, the first annular boss (21) is arranged outside the second through hole (24), and the edge of the second through hole (24) extends away from the first wheel disc (10) to form a third annular boss (25).

5. The speed change pulley according to claim 1, characterized in that: A plurality of first reinforcing ribs (15) are provided on a side of the first wheel disc (10) facing away from the second wheel disc (20).

6. The speed change pulley according to claim 4, characterized in that: A fourth annular boss (26) is provided on a side of the second wheel disc (20) facing away from the first wheel disc (10), the fourth annular boss (26) is arranged outside the third annular boss (25), and the axis of the fourth annular boss (26) is colinear with the axis of the third annular boss (25).

7. The speed-changing pulley according to claim 6, characterized in that: A plurality of second reinforcing ribs (27) are provided on a side of the second wheel disc (20) facing away from the first wheel disc (10).

8. The speed change pulley according to claim 7, characterized in that: The second reinforcing rib (27) is connected to the outer side wall of the fourth annular boss (26).

9. A speed change system, characterized in that: The invention comprises the variable speed pulley according to any one of claims 1 to 8.

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