Belt wheel speed regulation structure, self-propelled driving equipment and electric tool

Abstract

The utility model discloses a belt wheel speed regulation structure, self-propelled driving equipment and an electric tool. The belt wheel speed regulation structure comprises a speed regulation belt wheel, the speed regulation belt wheel is connected with a driving belt wheel through a belt, the driving belt wheel is connected with a driving source, the speed regulation belt wheel comprises a shaft body, a first wheel disc and a second wheel disc, the first wheel disc is fixedly arranged on the shaft body, the second wheel disc is movably arranged on the shaft body, and the belt is arranged between the first wheel disc and the second wheel disc. The first surface of the belt makes contact with the first wheel disc, and the second surface of the belt makes contact with the second wheel disc. A driving piece is arranged on the side, away from the first wheel disc, of the second wheel disc and is configured to push the second wheel disc to be close to the first wheel disc so that the belt can be extruded to the position away from the shaft body. According to the belt wheel designed in the scheme, one wheel disc is arranged to be capable of translating to adjust the distance between the two wheel discs, so that the distance between a belt and the wheel shafts is adjusted, and the function of adjusting the speed of the belt wheel is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical transmission structures, and in particular to a pulley speed regulation structure, a self-propelled drive device and an electric tool. Background Art

[0002] The synchronous belt drive device is a relatively conventional transmission structure, which realizes the transmission effect through two pulleys and belts. The active pulley is connected to the driving source, and its rotation speed is determined by the driving source, while the rotation speed of the driven pulley is determined by the winding diameter of the belt wound on the pulley. The smaller the belt winding diameter, the faster the rotation speed. Therefore, traditional pulley speed regulation structures mostly use pagoda wheels, which are composed of multiple stacked pulleys with different diameters. The speed regulation function is achieved by transferring the belt on different pulleys. However, the pagoda wheel is large in size and is not suitable for power tools. It will take up a lot of internal space. Utility Model Content

[0003] In order to overcome the above shortcomings, the purpose of the present application is to provide a pulley speed regulation structure, a self-propelled drive device and an electric tool.

[0004] In order to achieve the above objectives, this application adopts the following technical solutions:

[0005] In a first aspect, the present application also provides a pulley speed regulating structure, comprising:

[0006] A speed regulating pulley, the speed regulating pulley is used to be connected to a driving pulley through a belt, the driving pulley is connected to a driving source, and the speed regulating pulley comprises:

[0007] A shaft, a first wheel disc and a second wheel disc, wherein:

[0008] The first wheel disc is fixedly arranged on the shaft body, the second wheel disc is movably arranged on the shaft body, the belt is arranged between the first wheel disc and the second wheel disc, and the first surface of the belt contacts the first wheel disc, and the second surface of the belt contacts the second wheel disc;

[0009] A driving member is provided on the side of the second wheel disc away from the first wheel disc, and the driving member is configured to push the second wheel disc close to the first wheel disc so that the belt is squeezed to a position away from the shaft body.

[0010] Furthermore, it also includes a transmission shaft, wherein a first end of the transmission shaft is fixedly connected to the shaft body;

[0011] A housing, wherein a mounting opening is formed on the housing, and the second end of the transmission shaft extends into the housing through the mounting opening;

[0012] The driving member is arranged on the transmission shaft, and the driving member comprises:

[0013] A slip ring is sleeved on the transmission shaft, the slip ring is located on the side of the second wheel disc away from the first wheel disc, and the slip ring is configured to push the second wheel disc close to the first wheel disc

[0014] Furthermore, the driving member also includes a movable block, which is fixedly connected to the slip ring and can be rotatably arranged. The movable block is provided with a plurality of first inclined surfaces at a position close to the shell mounting port, and the shell mounting port is provided with a plurality of second inclined surfaces. The first inclined surfaces are fitted with the second inclined surfaces in a one-to-one correspondence; the second inclined surfaces are configured to push the first inclined surfaces when the movable block rotates so that the movable block moves toward the direction of the second wheel disc.

[0015] When the movable block rotates, the first inclined surface and the second inclined surface interact with each other to make the movable block rotate and rise, and a groove is provided on the movable block, a bearing is embedded in the groove, and the bearing is fixedly connected to the slip ring. When the movable block rotates and rises, it can drive the slip ring to rise, and the rising slip ring pushes the second wheel disc to rise and approach the first wheel disc, thereby reducing the distance between the first wheel disc and the second wheel disc.

[0016] Furthermore, a protrusion is arranged on the outer surface of the movable block, a bayonet is provided on the protrusion, and a draw hook is connected to the bayonet.

[0017] The draw hook pulls the bayonet through a driving device (such as a cylinder, a motor, etc.), thereby providing a rotational driving force to the movable block.

[0018] Furthermore, it also includes a torsion spring, wherein a first end of the torsion spring is fixedly connected to the housing, and a second end of the torsion spring is fixedly connected to the movable block.

[0019] When the movable block rotates and rises, the torsion spring is stretched. When the driving force of the movable block disappears, the torsion spring can make the movable block rotate and fall back to its original position. At this time, the slip ring will fall with the movable block. The slip ring will no longer press against the bottom of the second wheel disc, and the belt will be in a tensioned state. The belt can push the second wheel disc downward until the second wheel disc contacts the slip ring.

[0020] Furthermore, a groove is formed on the surface of the movable block facing the second wheel disc, a bearing is embedded in the groove, and the slip ring is fixedly connected to the bearing.

[0021] Furthermore, the first wheel disc and the second wheel disc have the same structure, and both include:

[0022] Plate,

[0023] The bottom shell, the disk body is fixedly arranged on the bottom shell, the bottom shell is provided with a through hole, the inner ring surface of the through hole is circumferentially provided with a toothed groove, and the outer ring surface of the shaft is circumferentially provided with a toothed protrusion corresponding to the toothed groove; the toothed groove cooperates with the toothed protrusion so that the wheel disc can be linked to the rotation of the shaft body when the shaft body slides up and down, and the disk body and the bottom shell are made of different materials, the disk body is made of plastic structure, which is convenient for the molding of the toothed groove, and the disk body is made of metal material to ensure the strength of the wheel disc.

[0024] Furthermore, the cross-section of the belt is trapezoidal, and the belt includes a first plane and a second plane, the width of the first plane is smaller than the width of the second plane, and the first plane faces the shaft.

[0025] In a second aspect, the present application further provides a self-propelled drive device, comprising any of the pulley speed regulating structures described above, and further comprising:

[0026] A drive shaft, both ends of which are provided with wheels, the drive shaft is connected to a worm wheel which rotates synchronously with the drive shaft, a worm is provided at the second end of the transmission shaft in the pulley speed regulation structure which is away from the shaft body, and the worm wheel is meshed with the worm.

[0027] In a third aspect, the present application also provides an electric tool equipped with the self-propelled drive device.

[0028] In the pulley speed regulation structure, the second wheel disc can slide on the shaft body to adjust the distance between the first wheel disc and the second wheel disc. The belt is set between the first wheel disc and the second wheel disc. The smaller the distance between the first wheel disc and the second wheel disc, the belt will be squeezed outward by the first wheel disc and the second wheel disc. Therefore, the greater the distance between the belt and the wheel shaft (rotation center), the larger the winding diameter of the belt, the smaller the rotation speed of the speed regulating pulley, and vice versa, the faster the rotation speed of the speed regulating pulley. The pulley designed in this scheme sets one of the wheels to be able to translate to adjust the distance between the two wheels, thereby adjusting the distance between the belt and the wheel shaft, so as to achieve the function of pulley speed regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide an understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation on the technical solution of the present disclosure. The shapes and sizes of the components in the accompanying drawings do not reflect the actual proportions and are only intended to illustrate the content of the present application.

[0030] Figure 1 Schematic diagram of the pulley speed regulation structure in the embodiment of the present application.

[0031] Figure 2 It is a schematic diagram of the cross-sectional structure of the pulley speed regulation structure in the embodiment of the present application.

[0032] Figure 3 Schematic diagram of the roulette structure in an embodiment of the present application.

[0033] Figure 4 This is a schematic diagram of the shaft structure in an embodiment of the present application.

[0034] Figure 5 Schematic diagram of the active block structure in the embodiment of the present application.

[0035] Figure 6 It is a schematic diagram of the structure at the shell installation port in the embodiment of the present application.

[0036] Figure 7 Schematic diagram of the structure of the self-propelled drive device in the embodiment of the present application.

[0037] In the above drawings, 1, speed regulating pulley; 11, shaft body; 12, first wheel plate; 13, second wheel plate; 2, transmission shaft; 3, housing; 4, slip ring; 5, movable block; 6, bearing; 7, protrusion; 8, bayonet; 9, torsion spring; 10, driving shaft; a, first inclined surface; b, second inclined surface;

[0038] 100, disk body; 200, bottom shell; 300, tooth-like protrusions. DETAILED DESCRIPTION

[0039] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the present application and are not limited to the scope of the present application. The implementation conditions adopted in the examples can be further adjusted as the conditions of the specific manufacturer, and the unspecified implementation conditions are usually the conditions in conventional experiments.

[0040] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connecting" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. In this article, "electrical connection" includes the situation where the constituent elements are connected together through an element with some electrical function. "Elements with some electrical function" are not particularly limited as long as they can transfer electrical signals between the connected constituent elements. "Elements with some electrical function" can be, for example, electrodes or wiring, or switching elements such as transistors, or other functional elements such as resistors, inductors or capacitors. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0041] In this application, the directions or positional relationships indicated by the terms "upper", "lower", "inner", "middle", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0042] Example

[0043] The present application embodiment provides a pulley speed regulation structure, such as Figure 1 As shown, it includes:

[0044] A speed regulating pulley (driven pulley) is connected to a driving pulley through a belt, and the driving pulley is connected to a driving source (such as a driving motor). The speed regulating pulley comprises a shaft, a first wheel and a second wheel. The first wheel is fixed on the shaft, and the second wheel can slide on the shaft to adjust the distance between the first wheel and the second wheel. The belt is arranged between the first wheel and the second wheel. The smaller the distance between the first wheel and the second wheel, the belt will be squeezed outward by the first wheel and the second wheel. Therefore, the greater the distance between the belt and the wheel shaft (rotation center), the larger the winding diameter of the belt, and the smaller the rotation speed of the speed regulating pulley. Conversely, the greater the rotation speed of the speed regulating pulley.

[0045] In some embodiments, Figure 2As shown, the pulley speed regulation structure also includes a transmission shaft, the first end (upper end) of the transmission shaft is fixedly connected to the shaft body, a mounting opening is opened on the shell, the second end (lower end) of the transmission shaft extends into the shell from the mounting opening, a slip ring is sleeved on the transmission shaft, the slip ring can slide on the transmission shaft, and a movable block is arranged at the mounting opening of the shell, as shown in FIG. Figure 5 As shown, the movable block 5 is provided with a plurality of first inclined surfaces at a portion close to the housing mounting opening. The movable block 5, also called a knob, is sleeved on the transmission shaft 2 and is (roughly) columnar. The movable block 5 has a protrusion 7, which extends radially along the body of the movable block 5, and has a bayonet / perforation 8. One end of the movable block 5 has a serrated protrusion, which has a first inclined surface a. The bayonet / perforation 8 is used to connect a draw hook, which is driven by a driving device (such as a cylinder, a motor, etc.), thereby causing the movable block to rotate along the transmission shaft.

[0046] like Figure 6 As shown, a second inclined surface b matching the shape of the first inclined surface a is arranged at the installation opening of the housing. When the movable block rotates, the first inclined surface and the second inclined surface interact with each other to make the movable block rotate and rise. A groove is provided on the movable block, and a bearing is embedded in the groove. The bearing is fixedly connected to the slip ring. When the movable block rotates and rises, it can drive the slip ring to rise. The rise of the slip ring pushes the second wheel disc to rise close to the first wheel disc, thereby reducing the distance between the first wheel disc and the second wheel disc. In this way, the contact area between the first wheel disc and the second wheel disc and the belt is adjusted respectively.

[0047] It should be noted that when the distance between the first pulley and the second pulley becomes larger, the winding diameter of the belt will become smaller. Therefore, it is necessary to set a tensioning structure (such as a tensioning pulley, not shown in the figure) at the belt position between the speed regulating pulley and the driving pulley to ensure that the belt is always in a tensioned state.

[0048] In some embodiments, Figure 1 As shown, the outer surface of the movable block is provided with a protrusion, and a bayonet 8 is opened on the protrusion. A draw hook is connected to the bayonet, and the draw hook pulls the bayonet through a driving device (such as a cylinder, a motor, etc.), thereby providing a rotational driving force for the movable block, and a torsion spring 9 is arranged between the movable block and the shell, one end of the torsion spring is connected to the movable block, and the other end is connected to the shell. When the movable block rotates and rises, the torsion spring 9 is stretched. When the driving force of the movable block disappears, the torsion spring 9 can make the movable block rotate and descend to reset, and at this time the slip ring will descend with the movable block, and the slip ring will no longer press against the bottom of the second wheel disc, and the belt is always in a tensioned state. The belt can squeeze the second wheel disc downward until the second wheel disc contacts the slip ring.

[0049] In some embodiments, the first wheel disc and the second wheel disc have the same structure, both comprising a disc body and a bottom shell, and the disc body is fixedly arranged on the bottom shell. Figure 3As shown, the bottom shell is provided with a perforation, and the inner ring surface of the perforation is provided with tooth-shaped grooves in the circumferential direction, such as Figure 4 As shown, the outer ring surface of the shaft is circumferentially provided with toothed protrusions corresponding to the toothed slots, and the toothed slots cooperate with the toothed protrusions so that the wheel disc can rotate in conjunction with the shaft body when the shaft body slides up and down, and the disc body and the bottom shell are made of different materials. The disc body adopts a plastic structure to facilitate the molding of the toothed slots, and the disc body is made of metal to ensure the strength of the wheel disc.

[0050] In some embodiments, the cross-section of the belt is a trapezoid, the plane with a smaller width of the trapezoid faces the inner shaft, and the two inclined surfaces of the belt are in contact with the two pulleys respectively.

[0051] The present application embodiment provides a self-propelled driving device, such as Figure 7 As shown, the device is equipped with the pulley speed regulating structure in the above embodiment, and the device also includes a driving shaft, both ends of the driving shaft are equipped with wheels, the driving shaft is connected to the worm gear that rotates synchronously with it, and the second end (lower end) of the transmission shaft in the pulley speed regulating structure away from the shaft body is equipped with a worm, and the worm wheel and the worm gear are meshed to realize transmission. The self-propelled drive device is mounted on the power tool, and a roller (not shown) is installed on the driving shaft 10 to drive the power tool to move.

[0052] The present application also provides an electric tool, which is equipped with the self-propelled drive device in the above embodiment. The electric tool can be a hand-push lawn mower, a hand-push snow sweeper, a hand-push hair dryer, a hand-push cleaning machine, etc.

[0053] The above embodiments are only for illustrating the technical concept and features of the present application, and their purpose is to enable people familiar with the technology to understand the content of the present application and implement it accordingly, and they cannot be used to limit the protection scope of the present application. Any equivalent transformation or modification made according to the spirit of the present application shall be included in the protection scope of the present application.

Claims

1. A pulley speed regulating structure, characterized in that: include A speed regulating pulley, the speed regulating pulley is used to be connected to a driving pulley through a belt, the driving pulley is connected to a driving source, and the speed regulating pulley comprises: A shaft, a first wheel disc and a second wheel disc, wherein: The first wheel disc is fixedly arranged on the shaft body, the second wheel disc is movably arranged on the shaft body, the belt is arranged between the first wheel disc and the second wheel disc, and the first surface of the belt contacts the first wheel disc, and the second surface of the belt contacts the second wheel disc; A driving member is provided on the side of the second wheel disc away from the first wheel disc, and the driving member is configured to push the second wheel disc close to the first wheel disc so that the belt is squeezed to a position away from the shaft body.

2. The pulley speed regulating structure according to claim 1, characterized in that: Also includes A transmission shaft, a first end of which is fixedly connected to the shaft body; A housing, wherein a mounting opening is formed on the housing, and the second end of the transmission shaft extends into the housing through the mounting opening; The driving member is arranged on the transmission shaft, and the driving member comprises: A slip ring is sleeved on the transmission shaft, the slip ring is located on the side of the second wheel disc away from the first wheel disc, and the slip ring is configured to push the second wheel disc to approach the first wheel disc.

3. The pulley speed regulating structure according to claim 2, characterized in that: Also includes: The driving member also includes: A movable block, the movable block is fixedly connected to the slip ring and can be rotatably arranged, a portion of the movable block close to the shell mounting opening is provided with a plurality of first inclined surfaces, a portion of the shell mounting opening is provided with a plurality of second inclined surfaces, the first inclined surfaces are fitted with the second inclined surfaces in a one-to-one correspondence, and the second inclined surfaces are configured to push the first inclined surfaces when the movable block rotates so that the movable block moves toward the direction of the second wheel disc.

4. The pulley speed regulating structure according to claim 3, characterized in that: The outer surface of the movable block is provided with a protruding portion, the protruding portion is provided with a bayonet, and the bayonet is connected with a draw hook.

5. The pulley speed regulating structure according to claim 3, characterized in that: The driving member further comprises a torsion spring, a first end of the torsion spring is fixedly connected to the housing, and a second end of the torsion spring is fixedly connected to the movable block.

6. The pulley speed regulating structure according to claim 3, characterized in that: A groove is formed on the surface of the movable block facing the second wheel disc, a bearing is embedded in the groove, and the slip ring is fixedly connected to the bearing.

7. The pulley speed regulating structure according to claim 1, characterized in that: The first wheel disc and the second wheel disc both include: Plate, The bottom shell, the disc body is fixedly arranged on the bottom shell, the bottom shell is provided with a through hole, the inner ring surface of the through hole is circumferentially provided with toothed grooves, and the outer ring surface of the shaft is circumferentially provided with toothed protrusions corresponding to the toothed grooves.

8. The pulley speed regulating structure according to claim 1, characterized in that: The cross section of the belt is trapezoidal, the first surface and the second surface of the belt are inclined surfaces, the third surface and the fourth surface of the belt are planes, the width of the third surface is smaller than the width of the fourth surface, and the third surface faces the shaft.

9. A self-propelled driving device, characterized in that: The pulley speed regulating structure according to any one of claims 1 to 8 further comprises: A drive shaft, both ends of which are provided with wheels, the drive shaft is connected to a worm wheel which rotates synchronously with the drive shaft, a worm is provided at the second end of the transmission shaft in the pulley speed regulation structure which is away from the shaft body, and the worm wheel is meshed with the worm.

10. An electric tool, characterized in that: A self-propelled drive device as claimed in claim 9 is provided.

Images