Bilateral variable stepless speed change system and mower

Abstract

The utility model provides a bilateral variable infinitely variable speed system and a mower. The bilateral variable infinitely variable speed system comprises a driving shaft, a first fixed wheel disc, a first movable wheel disc, a lifting seat, a driven shaft, a second fixed wheel disc, a second movable wheel disc, an elastic piece and a transmission belt. One end of the driving shaft is directly connected with a conveying shaft of an engine, and a first groove with variable groove width is formed between the first movable wheel disc and the first fixed wheel disc. The lifting base can drive the first movable wheel disc to move in the axial direction of the driving shaft, and a second groove with the variable groove width is formed between the second movable wheel disc and the second fixed wheel disc. Compared with a traditional clutch, the bilateral variable stepless speed change system is more accurate and smoother in speed change, the speed change mode does not need to cut off power output, impact and resistance during traditional speed change are not generated, the bilateral variable stepless speed change system is more stable, the stability of the mower during operation is guaranteed, and the failure rate is reduced. The utility model further provides a mower which comprises the bilateral variable stepless speed change system.

Description

Technical Field

[0001] The utility model relates to the technical field of lawn mower transmission structures, in particular to a bilaterally variable stepless speed change system and a lawn mower. Background Art

[0002] The speed change mode of riding lawn mower generally adopts manual mode and hydraulic mode.

[0003] Manual mode: It is to achieve different speeds of the vehicle by manually switching the transmission gears and executing different gears. Such a transmission is more complicated, 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 vehicle achieves different speeds through the hydraulic control mechanism and the hydraulic pump and gears in the hydraulic transmission. This mechanism requires high precision, is costly, has a complex control mechanism, and takes up a lot of space.

[0005] To address the technical issues with manual and hydraulic modes, some lawn mowers currently use continuously variable transmissions (CVTs). Compared to traditional clutch-based transmissions, CVTs offer greater precision and smoothness. These systems utilize a continuously variable transmission ratio, achieving speed changes by varying the gear ratio. However, achieving more precise and smooth speed changes while ensuring the stability of the lawn mower during operation remains a pressing challenge for those skilled in the art. Utility Model Content

[0006] In view of the defects in the prior art, the purpose of the present invention is to provide a bilaterally variable stepless speed change system and a lawn mower to improve the smoothness of the speed change process.

[0007] In order to achieve the above-mentioned purpose, the utility model provides a bilaterally variable continuously variable speed transmission system, including a driving shaft, one end of which is directly connected to the delivery shaft of the engine; a first fixed wheel disc, fixedly sleeved on the driving shaft; a first movable wheel disc, movably sleeved on the driving shaft, a first groove with a variable groove width is formed between the first movable wheel disc and the first fixed wheel disc; a lifting seat, rotatably connected to the first movable wheel disc, and the lifting seat can drive the first movable wheel disc to move along the axial direction of the driving shaft; a driven shaft is arranged parallel to the driving shaft; a second fixed wheel disc, fixedly sleeved on the driven shaft; the second movable wheel disc is provided on the driven shaft and can slide along the axial direction of the driven shaft, a second groove with a variable groove width is formed between the second movable wheel disc and the second fixed wheel disc; an elastic member, used to apply an elastic force to the second movable wheel disc to move toward the second fixed wheel disc; and a transmission belt, which transmits and connects the first groove and the second groove.

[0008] Preferably, a connecting seat is provided on the lifting seat, and the connecting seat is provided on the outer side of the first movable wheel.

[0009] Preferably, two connecting seats are provided, and the two connecting seats are symmetrically arranged along the axis of the driving shaft.

[0010] Preferably, the connecting seat is provided with at least one guide hole, and the axis of the guide hole is parallel to the axis of the driving shaft.

[0011] Preferably, the lifting seat is provided with a first bearing, the first movable wheel is provided with an annular boss which is colinear with its own axis, and the annular boss is provided in the first bearing.

[0012] Preferably, a limit head is provided on the driven shaft, and the limit head is located on the side of the second movable wheel disc away from the second fixed wheel disc. The elastic member is sleeved outside the driven shaft, and the elastic member abuts against the second movable wheel disc and the limit head respectively.

[0013] Preferably, the second movable wheel disc is arranged above the second fixed wheel disc.

[0014] Preferably, a mounting bracket is further included, a second bearing is sleeved on the driven shaft, and the second bearing is arranged on the mounting bracket.

[0015] Preferably, a driving pulley is sleeved on the driving shaft.

[0016] The utility model also provides a lawn mower, comprising the above-mentioned bilaterally variable stepless speed change system.

[0017] Beneficial effects of the utility model:

[0018] The utility model discloses a bilaterally variable stepless speed change system, which adjusts the diameter of the transmission belt in the first groove by driving the first movable wheel disc to rise and fall through the lifting seat, thereby correspondingly adjusting the diameter of the transmission belt in the second groove, thereby realizing the acceleration or deceleration operation of the lawn mower. At the same time, since the first movable wheel disc is raised and lowered by the drive of the lifting seat, the adjustment of the width of the first groove is smoother. In addition, since the driving shaft is directly connected to the output shaft of the engine, the power output process will also be smoother, effectively preventing the transmission belt from slipping. Compared with the speed change of the traditional clutch, the bilaterally variable stepless speed change system is more precise and smoother, and the speed change method does not require cutting off the power output, and will not produce the impact and resistance of the traditional speed change. It is more stable, ensuring the stability of the lawn mower during operation and reducing the failure rate.

[0019] The utility model discloses a lawn mower which ensures the use stability and service life of the lawn mower and improves the product quality by using the bilateral variable stepless speed change system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0021] Figure 1 A schematic structural diagram of a bilaterally variable continuously variable transmission system provided by an embodiment of the present utility model;

[0022] Figure 2 for Figure 1 Schematic cross-section of the state;

[0023] Figure 3 It is a structural diagram of the lifting seat;

[0024] Figure 4 It is a cross-sectional schematic diagram of the cooperation between the first movable wheel disc, the first bearing and the lifting seat;

[0025] Figure 5 It is a cross-sectional schematic diagram of the cooperation between the driving shaft, the first fixed wheel disc and the first movable wheel disc;

[0026] Figure 6 It is a structural diagram of the cooperation between the mounting bracket and the driven shaft;

[0027] Figure 7 for Figure 6 Schematic cross-section of the state;

[0028] Reference numerals:

[0029] 10. Driving shaft; 20. First fixed wheel disc; 30. First movable wheel disc; 31. Annular boss; 40. Lifting seat; 41. Connecting seat; 42. Guide hole; 43. First bearing; 50. Driven shaft; 51. Limiting head; 52. Second bearing; 60. Second fixed wheel disc; 70. Second movable wheel disc; 80. Elastic member; 90. Transmission belt; 100. First groove; 110. Second groove; 120. Mounting bracket; 130. Drive pulley. DETAILED DESCRIPTION

[0030] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0031] 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 those skilled in the art to which this utility model belongs.

[0032] In the description of this 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 device or element referred to 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.

[0033] In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of this utility model, "plurality" means more than two, unless otherwise specifically defined.

[0034] In this application, unless otherwise expressly specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0035] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it 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. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0036] Example 1

[0037] like Figure 1-7As shown, in one embodiment of the present invention, a bilaterally variable continuously variable transmission system is provided, comprising a driving shaft 10, a first fixed disc 20, a first movable disc 30, a lifting seat 40, a driven shaft 50, a second fixed disc 60, a second movable disc 70, an elastic member 80, and a transmission belt 90. The top end of the driving shaft 10 is directly connected to the engine's delivery shaft. The first fixed disc 20 is fixedly mounted on the driving shaft 10, and the first movable disc 30 is movably mounted on the driving shaft 10 and located below the first fixed disc 20. A first slot 100 with a variable slot width is formed between the first movable disc 30 and the first fixed disc 20. The lifting seat 40 is rotatably connected to the first movable disc 30 and can drive the first movable disc 30 to move axially along the driving shaft 10. In one embodiment, the driving shaft 10 is connected to the engine's delivery shaft (crankshaft). The driving shaft 10 can be part of the crankshaft, that is, the driving shaft 10 and the crankshaft are an integral structure, or the driving shaft 10 and the crankshaft are connected through a gearbox. In this technical solution, the driving shaft 10 is preferably a part of the crankshaft.

[0038] The driven shaft 50 is arranged parallel to the driving shaft 10 and is connected to the rear axle of the lawn mower (not shown). A second fixed disc 60 is fixedly mounted on the driven shaft 50. A second movable disc 70 is mounted on the driven shaft 50 and is slidable along the axial direction of the driven shaft 50. A second slot 110 with a variable slot width is formed between the second movable disc 70 and the second fixed disc 60. An elastic member 80 is used to apply an elastic force to the second movable disc 70, causing it to move toward the second fixed disc 60. A transmission belt 90 is used to connect the first slot 100 and the second slot 110.

[0039] The first fixed disc 20 and the first movable disc 30 form a driving speed-shifting pulley, while the second fixed disc 60 and the second movable disc 70 form a driven speed-shifting pulley. As the lifting actuator (not shown) drives the lifting base 40 and the first movable disc 30 upward, the width of the first slot 100 gradually decreases, and the diameter of the transmission belt 90 within the first slot 100 increases. Because the length of the transmission belt 90 is constant, this causes the diameter of the transmission belt 90 within the second slot 110 to decrease (i.e., the transmission belt 90 drives the second movable disc 70 away from the second fixed disc 60, overcoming the elastic force of the elastic member 80). This accelerates the lawn mower.

[0040] When the lifting actuator (not shown in the drawings) drives the lifting seat 40 and the first movable wheel disc 30 to descend, the width of the first slot 100 gradually increases, and the diameter of the transmission belt 90 in the first slot 100 decreases. Since the length of the transmission belt 90 is a fixed value, this will drive the diameter of the transmission belt 90 in the second slot 110 to increase (that is, the elastic member 80 will drive the second movable wheel disc 70 to move closer to the second fixed wheel disc 60). Therefore, this achieves the deceleration of the lawn mower. In addition, the bilateral variable stepless speed change system of the present technical solution achieves the different speeds required when the entire vehicle is traveling through the cooperation of the first fixed wheel disc (20), the first movable wheel disc (30), the lifting seat (40), the second fixed wheel disc (60), the second movable wheel disc (70), the transmission belt (90) and other components; moreover, the operating mechanism is simple, the precision requirement is not high, and the cost is low, which solves the problems of manual shifting and complex hydraulic operating mechanisms in traditional technologies.

[0041] The present embodiment discloses a bilaterally variable stepless speed change system, which adjusts the diameter of the transmission belt 90 in the first slot 100 by driving the first movable wheel 30 to move up and down through the lifting seat 40, thereby correspondingly adjusting the diameter of the transmission belt 90 in the second slot 110, thereby realizing the acceleration or deceleration operation of the lawn mower. At the same time, since the first movable wheel 30 is raised and lowered by the drive of the lifting seat 40, the adjustment of the slot width of the first slot 100 is smoother. In addition, since the active shaft 10 is directly connected to the output shaft of the engine, the power output process will also be smoother, effectively preventing the transmission belt 90 from slipping. Compared with the speed change of the traditional clutch, the bilaterally variable stepless speed change system is more precise and smoother, and the speed change method does not require cutting off the power output, and will not produce the impact and resistance of the traditional speed change. It is more stable, ensuring the stability of the lawn mower during operation and reducing the failure rate.

[0042] In one embodiment, a connecting seat 41 is provided on the lifting seat 40, and the connecting seat 41 is arranged on the outside of the first movable wheel disc 30. The lifting seat 40 is connected to the lifting actuator through the connecting seat 41. By arranging the connecting seat 41 on the outside of the first movable wheel disc 30, interference between the lifting actuator and the first movable wheel disc 30 is avoided.

[0043] In one embodiment, in order to improve the stability of the lifting process of the lifting seat 40 , two connecting seats 41 are provided, and the two connecting seats 41 are symmetrically arranged along the axis of the driving shaft 10 .

[0044] In one embodiment, the connecting base 41 is provided with two guide holes 42, the axes of which are parallel to the axis of the driving shaft 10. The lifting base 40 moves along the axial direction of the driving shaft 10 by engaging the guide holes 42 in the connecting base 41 with guide rods (not shown). The lifting base 40 is then driven by the lifting actuator to move the first movable wheel 30 toward or away from the first fixed wheel 20.

[0045] In one embodiment, the lifting base 40 is provided with a first bearing 43, and the first movable wheel disc 30 is provided with an annular boss 31 colinear with its own axis. The annular boss 31 is disposed within the first bearing 43. The lifting base 40 is provided with a through hole, in which the first bearing 43 is fixed. The first movable wheel disc 30 is engaged with the first bearing 43 via the annular boss 31, thereby achieving a rotational connection with the lifting base 40.

[0046] In one embodiment, a stopper 51 is provided on the driven shaft 50. The stopper 51 is located on the side of the second movable disc 70 facing away from the second fixed disc 60. An elastic member 80 is sleeved on the driven shaft 50, abutting the second movable disc 70 and the stopper 51, respectively. The elastic member 80 is a compression spring. When the lifting actuator drives the lifting seat 40 and the first movable disc 30 upward, the width of the first slot 100 gradually decreases, and the diameter of the transmission belt 90 within the first slot 100 increases. This causes the diameter of the transmission belt 90 within the second slot 110 to decrease, that is, the transmission belt 90 drives the second movable disc 70 away from the second fixed disc 60. During this process, the second movable disc 70 cooperates with the stopper 51, further compressing the elastic member 80.

[0047] When the lifting actuator (not shown) drives the lifting base 40 and the first movable wheel disc 30 downward, the width of the first slot 100 gradually increases, and the diameter of the transmission belt 90 in the first slot 100 decreases. This causes the diameter of the transmission belt 90 in the second slot 110 to increase. That is, under the elastic force of the elastic member 80, the second movable wheel disc 70 is driven to move toward the second fixed wheel disc 60.

[0048] In one embodiment, in order to prevent the elastic member 80 from failing prematurely due to the weight of the second movable wheel disc 70 and to extend the service life of the elastic member 80 , the second movable wheel disc 70 is disposed above the second fixed wheel disc 60 .

[0049] In one embodiment, the bilaterally variable continuously variable transmission system further includes a mounting bracket 120. A second bearing 52 is sleeved on the driven shaft 50, and the second bearing 52 is mounted on the mounting bracket 120. The mounting bracket 120 is designed to support the driven shaft 50, facilitating installation of the driven shaft 50 and other components on the frame.

[0050] In one embodiment, a driving pulley 130 is sleeved on the driving shaft 10, and the driving pulley 130 is used for driving the blade to rotate in a rotating shaft transmission connection.

[0051] Example 2

[0052] In another embodiment of the present invention, a lawn mower is provided, comprising the bilaterally variable continuously variable speed system of the above-mentioned embodiment 1. By using the above-mentioned bilaterally variable continuously variable speed system, the stability and service life of the lawn mower are ensured, and the product strength is improved.

[0053] In the specification of the present invention, a large number of specific details are described. However, it is understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A bilaterally variable continuously variable transmission system, characterized in that: include: A driving shaft (10), one end of which is directly connected to the transmission shaft of the engine; A first fixed wheel disc (20) fixedly sleeved on the driving shaft (10); A first movable wheel disc (30) is movably sleeved on the driving shaft (10), and a first groove (100) with a variable groove width is formed between the first movable wheel disc (30) and the first fixed wheel disc (20); A lifting seat (40) is rotatably connected to the first movable wheel disc (30), and the lifting seat (40) can drive the first movable wheel disc (30) to move along the axial direction of the driving shaft (10); A driven shaft (50) arranged in parallel with the driving shaft (10); A second fixed wheel disc (60) fixedly sleeved on the driven shaft (50); A second movable wheel disc (70) is disposed on the driven shaft (50) and can slide along the axial direction of the driven shaft (50), and a second groove (110) with a variable groove width is formed between the second movable wheel disc (70) and the second fixed wheel disc (60); an elastic member (80) for applying an elastic force to the second movable wheel disc (70) to move it toward the second fixed wheel disc (60); and A transmission belt (90) is used to transmission-connect the first groove (100) and the second groove (110).

2. The bilaterally variable continuously variable transmission system according to claim 1, characterized in that: The lifting seat (40) is provided with a connecting seat (41), and the connecting seat (41) is arranged on the outer side of the first movable wheel disc (30).

3. The bilaterally variable continuously variable transmission system according to claim 2, characterized in that: Two connecting seats (41) are provided, and the two connecting seats (41) are symmetrically arranged along the axis of the driving shaft (10).

4. The bilaterally variable continuously variable transmission system according to claim 3, characterized in that: At least one guide hole (42) is provided on the connecting seat (41), and the axis of the guide hole (42) is parallel to the axis of the driving shaft (10).

5. The bilaterally variable continuously variable transmission system according to claim 2, characterized in that: The lifting seat (40) is provided with a first bearing (43), and the first movable wheel disc (30) is provided with an annular boss (31) colinear with its own axis, and the annular boss (31) is arranged in the first bearing (43).

6. The bilaterally variable continuously variable transmission system according to claim 1, characterized in that: The driven shaft (50) is provided with a limit head (51), and the limit head (51) is located on a side of the second movable wheel disc (70) away from the second fixed wheel disc (60). The elastic member (80) is sleeved outside the driven shaft (50), and the elastic member (80) abuts against the second movable wheel disc (70) and the limit head (51), respectively.

7. The bilaterally variable continuously variable transmission system according to claim 6, characterized in that: The second movable wheel disc (70) is arranged above the second fixed wheel disc (60).

8. The bilaterally variable continuously variable transmission system according to claim 1, characterized in that: It also includes a mounting bracket (120), a second bearing (52) is sleeved on the driven shaft (50), and the second bearing (52) is arranged on the mounting bracket (120).

9. The bilaterally variable continuously variable transmission system according to claim 1, characterized in that: The driving shaft (10) is sleeved with a driving pulley (130).

10. A lawn mower, characterized in that: A bilaterally variable continuously variable transmission system comprising any one of claims 1-9.

Images