CN115978187A

CN115978187A - Stepless speed variator

Info

Publication number: CN115978187A
Application number: CN202211664820.1A
Authority: CN
Inventors: 覃波
Original assignee: Sichuan Hongshengda Hydraulic Equipment Co ltd
Current assignee: Sichuan Hongshengda Hydraulic Equipment Co ltd
Priority date: 2022-12-22
Filing date: 2022-12-22
Publication date: 2023-04-18

Abstract

The invention discloses a continuously variable transmission, which comprises a power distribution mechanism, a speed regulating mechanism, a speed limiting mechanism and a speed changing mechanism, wherein the power distribution mechanism is arranged on the power distribution mechanism; the power distribution mechanism is used as a power input end and is used for distributing power to the input end of the speed regulating mechanism and the input end of the speed changing mechanism respectively; the output end of the speed-regulating mechanism is in power connection with the input end of the speed-limiting mechanism, the output end of the speed-limiting mechanism is in power connection with the speed-regulating end of the speed-changing mechanism, and the output end of the speed-changing mechanism outputs power; the input end and the output end of the speed limiting mechanism are respectively of a first spiral structure and a second spiral structure, the first spiral structure and the second spiral structure are spiral structures with the same structure and can rotate around the axis of the first spiral structure and the second spiral structure, and the side faces of the first spiral structure and the second spiral structure are in spiral meshing with each other and rotate in the same direction. By adopting the scheme, the speed limiting mechanism is added between the speed regulating mechanism and the speed changing mechanism, and the speed regulating process of the speed regulating mechanism is stable through the speed limiting effect of the speed limiting mechanism, so that the speed regulating mechanism is not easy to slip, large in transmission torque and high in transmission efficiency.

Description

Stepless speed variator

Technical Field

The invention relates to the technical field of mechanical power, in particular to a continuously variable transmission.

Background

Since 2007, a series of electro-mechanically controlled continuously variable transmissions have matured and have found wide application in the road, off-road vehicle and general machinery fields due to their low cost, high efficiency and high reliability.

A Continuously Variable Transmission (CVT) is composed of two groups of gears or pulleys with variable diameters, and is connected through a chain or a belt, and the diameter of the gears or the pulleys is changed to control the speed change ratio. The steel belt for driving the CVT has limited bearing force, generally, the displacement of 3.0L or the torque of more than 300 Nm is the upper limit of the steel belt, and if the upper limit is broken, the structure principle and the mechanical abrasion are irreversible, so that the failure rate is high, the cost is high, and the widely used steel belt type continuously variable transmission has the defects of easy slipping, small transmission torque, low transmission efficiency, difficult maintenance and the like in the speed regulation process.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provides a continuously variable transmission, by adopting the scheme, a speed limiting mechanism can be added between a speed regulating mechanism and a speed changing mechanism, and the speed regulating process of the speed regulating mechanism is stable through the speed limiting function of the speed limiting mechanism and a gear transmission mode, so that the speed regulating mechanism is not easy to slip, large in transmission torque and high in transmission efficiency.

The invention is realized by the following technical scheme:

a kind of stepless speed change gear, including power distribution gear, speed governing mechanism, speed-limiting mechanism and speed change mechanism;

the power distribution mechanism is used as a power input end and is used for distributing power to the input end of the speed regulating mechanism and the input end of the speed changing mechanism respectively;

the output end of the speed regulating mechanism is in power connection with the input end of the speed limiting mechanism, the output end of the speed limiting mechanism is in power connection with the speed regulating end of the speed changing mechanism, and the output end of the speed changing mechanism outputs power;

the input end and the output end of the speed limiting mechanism are respectively of a first spiral structure and a second spiral structure, the first spiral structure and the second spiral structure are both spiral structures with the same structure and can rotate around the axis of the first spiral structure and the second spiral structure, and the side faces of the first spiral structure and the second spiral structure are in mutual spiral meshing and rotate in the same direction.

Compared with the prior art, the widely used steel belt type continuously variable transmission has the defects of easy slipping, small transmission torque, low transmission efficiency, difficult maintenance and the like in the speed regulation process, the scheme provides the continuously variable transmission which can be used for continuously variable transmission of vehicle-mounted tools such as vehicles, motorboats, bicycles and the like. Wherein, after the power distribution mechanism distributes power, the speed regulating mechanism will regulate speed according to the vehicle owner, thereby change the transmission ratio, make the output terminal of the speed regulating mechanism input corresponding power to the input terminal of the speed regulating mechanism, wherein, the speed regulating mechanism is two helical structures with the same structure, the side of the speed regulating mechanism is engaged spirally with each other, the corresponding position between each other is blocked in, at this moment, two helical structures rotate in the same direction, because of the restriction of the helical structures, if only exert torsion to a helical structure alone, two helical structures will have the tendency of rotating in opposite directions because of the friction, make two helical structures extrude each other and be restricted from rotating, namely, the first helical structure and the second helical structure can not rotate, can only exert torsion to make it rotate in the same direction with the same speed separately, in this scheme, the output terminal of the speed regulating mechanism inputs power to the first helical structure, exert torque, and the input terminal of the speed regulating mechanism has power from the power distribution mechanism input, at this moment, the input terminal of the speed regulating mechanism will exert torque to the input terminal of the speed regulating mechanism, when the second helical structure can both rotate, the speed regulating mechanism can make the second helical structure can be restricted from the second helical structure, thereby make the speed regulating mechanism can be rotated in the same direction with the second helical structure, when the speed regulating mechanism can be restricted by the second helical structure, the torque of the second helical structure, the speed regulating mechanism can be restricted by the second helical structure, when the torque of the speed regulating mechanism, the second helical structure can be restricted by the second helical structure, when the torque of the speed regulating mechanism, the second helical structure can be restricted by the second helical structure, at the moment, the torque of the output end of the speed change mechanism is controllable; if the power distributed by the power distribution mechanism is constant, the power of the input end of the speed regulating mechanism and the power of the input end of the speed changing mechanism are constant at the moment, the input end of the speed regulating mechanism is connected with the speed limiting mechanism, the speed limiting mechanism is connected with the speed changing end of the speed changing mechanism, the torque of the speed changing end of the speed changing mechanism is constant through the spiral speed limiting structure of the speed limiting mechanism, and the power of the output end is constant when the power of the speed regulating end and the power of the input end of the speed changing mechanism are constant; therefore, through the scheme, the speed limiting mechanism is added between the speed regulating mechanism and the speed changing mechanism, and the speed regulating process of the speed regulating mechanism is stable through the speed limiting function of the speed limiting mechanism and the gear transmission mode, so that the speed regulating mechanism is not easy to slip, large in transmission torque and high in transmission efficiency; in addition, the continuously variable transmission designed by the scheme has the advantages of simple structure, small size, light weight and the like, and is wider in application range.

The device is further optimized to further comprise a main shaft, wherein a first side plate and a second side plate are respectively sleeved at two ends of the main shaft, and an intermediate fixing plate is sleeved on the main shaft between the first side plate and the second side plate; the speed regulating mechanism and the speed limiting mechanism are both positioned between the first side plate and the middle fixing plate, the speed regulating mechanism is positioned between the second side plate and the middle fixing plate, the power distribution mechanism is a first power input gear, the first power input gear is sleeved on the main shaft and positioned on the outer side of the first side plate, and the first power input gear can rotate around the axis of the first power input gear; for attachment to a vehicle-mounted tool and for proper separation of internal components.

Preferably, the middle fixing plate and the first side plate are both fixed to the main shaft, the output end of the speed change mechanism drives the second side plate to rotate, a housing is connected between the opposite sides of the first side plate and the second side plate, the housing is fixedly connected with the second side plate and rotatably connected with the first side plate, and the housing can rotate around the axis of the housing; for outputting power to the vehicle-mounted tool.

Preferably, the speed regulating mechanism comprises a second power input gear, the second power input gear is meshed with the first power input gear, an input shaft of the second power input gear penetrates through the first side plate and is connected with one end of a universal joint connecting shaft, and the other end of the universal joint connecting shaft is rotatably connected with the middle fixing plate; a sliding shaft and a driven wheel are further arranged between the first side plate and the middle fixing plate, a shifting sheet is connected to the sliding shaft in a sliding mode, a driving wheel is connected to the universal joint connecting shaft in a sliding mode, the driven wheel is conical, and the driving wheel is in transmission connection with the side face of the driven wheel; the sliding shaft and the universal joint connecting shaft are parallel to the side face of the driven wheel; the shifting piece is connected with a speed regulator through a steel rope, the speed regulator is used for driving the shifting piece to slide, and the shifting piece is used for driving the driving wheel to slide; the stepless speed regulation method is used for realizing stepless speed regulation.

Further optimization, the poking sheet is U-shaped, and the driving wheel is clamped in the poking sheet; the driving wheels can stably drive the driving wheels to slide towards two sides.

Further optimization, the driving wheel and the driven wheel are in friction transmission connection.

Preferably, the end part of the first spiral structure is provided with a first speed limiting gear engaged with the end part of the driven wheel, the end part of the output end of the second spiral structure penetrating through the middle fixing plate is provided with a second speed limiting gear, and the second speed limiting gear is used for transmitting power to the speed regulating end of the speed changing mechanism; used for connecting the speed limiting mechanism.

Preferably, the side surfaces of the first spiral structure and the second spiral structure are provided with balls, and the balls are arranged along the spiral direction of the spiral structure; the balls with the same direction of spiral are arranged on the spiral structure, so that the friction force can be reduced when the first spiral structure and the second spiral structure rotate at the same direction and the same speed.

Preferably, the speed change mechanism comprises a power output gear, a fourth power input gear and a speed regulation gear which are all conical teeth, wherein the power output gear and the speed regulation gear are sleeved on the main shaft, are arranged oppositely and can rotate around the axis of the main shaft; the main shaft is also sleeved with a second variable speed transmission gear, the output end of the speed limiting mechanism transmits power to the second variable speed transmission gear, and the second variable speed transmission gear is connected with the speed regulating gear and synchronously rotates; the speed regulation end of the speed change mechanism comprises a third power input gear, the third power input gear is meshed with the first power input gear, a connecting shaft of the third power input gear sequentially penetrates through the end parts of the first side plate and the middle fixing plate to be provided with a power transmission gear, the power transmission gear is meshed with a first speed change transmission gear sleeved on the main shaft, the fourth power input gear is eccentrically connected with the side surface of the first speed change transmission gear, the fourth power input gear is parallel to the axis of the main shaft, and the first speed change transmission gear is used for driving the fourth power input gear to rotate around the axis of the main shaft; two sides of the fourth power input gear are respectively meshed with the power output gear and the speed regulating gear; for achieving a stable power output through the speed change mechanism.

The first variable-speed transmission gear is positioned between the speed regulating gear and the second variable-speed transmission gear, a cylinder is connected between the speed regulating gear and the second variable-speed transmission gear, the cylinder penetrates through the middle of the first variable-speed transmission gear, and the first variable-speed transmission gear is sleeved on the cylinder through a bearing; the speed regulating gear is used for preventing the transmission between the speed regulating gear and the second speed changing gear from influencing the transmission of the first speed changing gear.

Compared with the prior art, the invention has the following advantages and beneficial effects:

the invention provides a continuously variable transmission, which adopts the scheme that a speed limiting mechanism can be added between a speed regulating mechanism and a speed changing mechanism, and the speed regulating process of the speed regulating mechanism is stable through the speed limiting function of the speed limiting mechanism and a gear transmission mode, so that the speed regulating mechanism is not easy to slip, large in transmission torque and high in transmission efficiency.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic structural view of a continuously variable transmission provided in accordance with the present invention;

FIG. 2 is a schematic view of the internal components of a continuously variable transmission provided in accordance with the present invention;

fig. 3 is a schematic structural diagram of a speed limiting mechanism provided by the invention.

Reference numbers and corresponding part names in the figures:

1-a first power input gear, 2-a second power input gear, 3-a third power input gear, 4-a main shaft, 5-a first side plate, 6-a second side plate, 7-an intermediate fixing plate, 9-a shell, 10-a driving wheel, 11-a driven wheel, 12-a shifting sheet, 13-a universal joint connecting shaft, 14-a sliding shaft, 15-a steel rope, 21-a first spiral structure, 22-a second spiral structure, 23-a first speed limiting gear, 24-a second speed limiting gear, 31-a power output gear, 32-a fourth power input gear, 33-a speed regulating gear, 34-a first speed change transmission gear, 35-a second speed change transmission gear and 36-a power transmission gear.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

Examples

The present embodiment provides a continuously variable transmission, as shown in fig. 1 to 3, including a power distribution mechanism, a speed regulation mechanism, a speed limiting mechanism, and a speed change mechanism;

the output end of the speed-regulating mechanism is in power connection with the input end of the speed-limiting mechanism, the output end of the speed-limiting mechanism is in power connection with the speed-regulating end of the speed-changing mechanism, and the output end of the speed-changing mechanism outputs power;

the input end and the output end of the speed limiting mechanism are respectively a first spiral structure 21 and a second spiral structure 22, the first spiral structure 21 and the second spiral structure 22 are both spiral structures with the same structure and can rotate around the axes of the first spiral structure 21 and the second spiral structure 22, and the side surfaces of the first spiral structure 21 and the second spiral structure 22 are spirally meshed with each other and rotate in the same direction.

Compared with the prior art, the widely used steel belt type continuously variable transmission has the defects of easy slipping, small transmission torque, low transmission efficiency, difficult maintenance and the like in the speed regulation process, the scheme provides the continuously variable transmission which can be used for continuously variable transmission of vehicle-mounted tools such as vehicles, motorboats, bicycles and the like. Wherein, after the power distribution mechanism distributes power, the speed regulation mechanism will regulate speed according to the vehicle owner, thereby change the transmission ratio, make the output terminal of the speed regulation mechanism input corresponding power to the input terminal of the speed regulation mechanism, wherein, the speed regulation mechanism is two helical structures with the same structure, the side of the speed regulation mechanism is engaged spirally with each other, the corresponding position between each other is blocked in, at this moment, two helical structures rotate in the same direction, because of the restriction of helical structure, if only exert torsion to a helical structure alone, two helical structures will have the tendency of rotating in opposite directions because of the friction, make two helical structures extrude each other and restricted unable to rotate, namely first helical structure 21 and second helical structure 22 can't rotate, can only exert torsion to make it rotate in the same direction with the same speed separately, in this scheme, the output terminal of the speed regulation mechanism inputs power to first helical structure 21, exert torque, and the input terminal of the speed regulation mechanism has power from the power distribution mechanism input, at this moment, the input terminal of the speed regulation mechanism will exert torque to the input terminal of the speed regulation mechanism, the second helical structure can only drive the second helical structure 22, thereby the speed regulation mechanism can be rotated in the same direction with the second helical structure, when the second helical structure 21 and the second helical structure 22, the second helical structure can be rotated independently exerted torque, the torsion of the speed regulation mechanism, thereby can make the speed regulation mechanism, the speed regulation mechanism can be limited to the second helical structure, the output terminal of the speed regulation mechanism, the second helical structure can be limited, when the speed regulation mechanism, the speed regulation mechanism can be rotated with the second helical structure 22, when the torque of the speed regulating end and the torque of the input end of the speed changing mechanism are both controllable, the torque of the output end of the speed changing mechanism is controllable at the moment; if the power distributed by the power distribution mechanism is constant, the power of the input end of the speed regulating mechanism and the power of the input end of the speed changing mechanism are constant at the moment, the input end of the speed regulating mechanism is connected with the speed limiting mechanism, the speed limiting mechanism is connected with the speed changing end of the speed changing mechanism, the torque of the speed changing end of the speed changing mechanism is constant through the spiral speed limiting structure of the speed limiting mechanism, and the power of the output end is constant when the power of the speed regulating end and the power of the input end of the speed changing mechanism are constant; therefore, by the scheme, the speed limiting mechanism is added between the speed regulating mechanism and the speed changing mechanism, and the speed regulating process of the speed regulating mechanism is stable by the speed limiting function of the speed limiting mechanism and the gear transmission mode, so that the speed regulating mechanism is not easy to slip, large in transmission torque and high in transmission efficiency; in addition, in the attached drawings of the scheme, the bearings 8 on the gears or the connecting shafts are not shown for displaying part of parts more clearly, but the actual technical scheme of the scheme is not influenced; in addition, the continuously variable transmission designed by the scheme has the advantages of simple structure, small size, light weight and the like, and is wider in application range.

Referring to fig. 2, as an embodiment of the internal components for connecting to the vehicle-mounted tool and reasonably separating, the following are provided: the device also comprises a main shaft 4, wherein a first side plate 5 and a second side plate 6 are respectively sleeved at two ends of the main shaft 4, and an intermediate fixing plate 7 is also sleeved on the main shaft 4 positioned between the first side plate 5 and the second side plate 6; the speed regulating mechanism and the speed limiting mechanism are both positioned between the first side plate 5 and the middle fixing plate 7, the speed regulating mechanism is positioned between the second side plate 6 and the middle fixing plate 7, the power distribution mechanism is a first power input gear 1, the first power input gear 1 is sleeved on the main shaft 4 and positioned on the outer side of the first side plate 5, and the first power input gear 1 can rotate around the axis of the first power input gear 1;

it can be understood that, in this embodiment, two ends of the main shaft 4 are connected to and fixed in the vehicle-mounted tool, one end of the main shaft is provided with the first power input gear 1, the first power input gear 1 is sleeved at one end of the main shaft 4 through a bearing 8, the main shaft is driven by external power to rotate around the axis of the main shaft, the main shaft 4 is further provided with the first side plate 5, the middle fixing plate 7 and the second side plate 6 at intervals in sequence from one end to the other end, the speed regulating mechanism and the speed limiting mechanism are arranged between the first side plate 5 and the middle fixing plate 7, and the speed changing mechanism is arranged between the second side plate 6 and the middle fixing plate 7, so that internal parts are reasonably distributed, and mutual interference is avoided; in addition, in fig. 1, the second side plate 6 is blocked by the housing 9, in fig. 2, the second side plate 6 is not shown for observing the internal parts in detail, but the implementation of the scheme is not affected, and it can be understood that the second side plate 6 is sleeved on the cylinder body connected with the power output gear 31 in fig. 2, so that the synchronous rotation of the second side plate 6 and the power output gear 31 is realized.

As a specific embodiment for outputting power to a vehicle-mounted tool, the following is provided: the middle fixing plate 7 and the first side plate 5 are both fixed on the main shaft 4, the output end of the speed change mechanism drives the second side plate 6 to rotate, the shell 9 is connected between the opposite sides of the first side plate 5 and the second side plate 6, the shell 9 is fixedly connected with the second side plate 6 and is rotatably connected with the first side plate 5, and the shell 9 can rotate around the axis of the shell;

it can be understood that, in this embodiment, the diameters of the first side plate 5 and the second side plate 6 are both larger than the diameter of the intermediate fixing plate 7, the housing 9 is connected between the first side plate 5 and the second side plate 6, the housing 9 can accommodate the internal speed regulating mechanism, the speed limiting mechanism and the speed changing mechanism, during the driving process, because the second side plate 6 is connected with the output end of the speed changing mechanism, the second side plate 6 can rotate around the axis of itself, the second side plate 6 is fixedly connected with the housing 9, the housing 9 can be driven to rotate synchronously, the housing 9 is rotatably connected with the first side plate 5 through the bearing 8, the first side plate 5 is stationary, the housing 9 is driven to rotate by the second side plate 6, at this time, the housing 9 is provided with a plurality of connecting parts connected to the input end of the vehicle-mounted tool, and power is output through the housing 9; in addition, the shell 9 arranged in the scheme can seal the gear, and can realize the effects of dust prevention, water prevention, maintenance free and the like.

Referring to fig. 2, as a specific embodiment for implementing stepless speed regulation, the following are set up: the speed regulating mechanism comprises a second power input gear 2, the second power input gear 2 is meshed with the first power input gear 1, an input shaft of the second power input gear 2 penetrates through the first side plate 5 to be connected with one end of a universal joint connecting shaft 13, and the other end of the universal joint connecting shaft 13 is rotatably connected with the middle fixing plate 7; a sliding shaft 14 and a driven wheel 11 are further arranged between the first side plate 5 and the middle fixing plate 7, a shifting piece 12 is connected onto the sliding shaft 14 in a sliding manner, a driving wheel 10 is connected onto a universal joint connecting shaft 13 in a sliding manner, the driven wheel 11 is conical, and the driving wheel 10 is in transmission connection with the side face of the driven wheel 11; the sliding shaft 14 and the universal joint connecting shaft 13 are both parallel to the side surface of the driven wheel 11; the shifting sheet 12 is connected with a speed regulator through a steel rope 15, the speed regulator is used for driving the shifting sheet 12 to slide, and the shifting sheet 12 is used for driving the driving wheel 10 to slide;

it can be understood that, in this embodiment, the driven wheel 11 adopts a conical transmission structure, during the transmission process, the second power input gear 2 is located outside the first side plate 5 and is meshed with the first power input gear 1, the connection shaft of the second power input gear 2 passes through the first side plate 5 and is connected with the universal joint, the connection shaft is connected with the first side plate 5 through the bearing 8 so as to drive the universal joint to rotate, the universal joint is connected with the intermediate fixing plate 7 through the universal joint connection shaft 13, the end part of the universal joint connection shaft 13 is connected with the intermediate fixing plate 7 through the bearing 8 so as to drive the driving wheel 10 on the universal joint connection shaft 13 to rotate under the driving of the second power input gear 2, the driving wheel 10 can slide on the universal joint connection shaft 13 through a connection key and the like, at the moment, the sliding shaft 14 and the universal joint connection shaft 13 are both parallel to the side surface of the driven wheel 11, the poking piece 12 is connected with an external speed regulator through a steel rope 15, so that the poking piece 12 is pulled to slide on the sliding shaft 14, the poking piece 12 drives the driving wheel 10 to slide on the universal joint connection shaft 13, thereby changing the transmission radius between the driving wheel 10 and changing the stepless speed change ratio.

As a redundancy scheme, the shifting sheet 12 is U-shaped, and the driving wheel 10 is clamped in by the shifting sheet 12; the driving wheel 10 can be stably driven to slide towards two sides.

As a redundancy, the driving wheel 10 and the driven wheel 11 are connected by friction transmission.

Referring to fig. 2, as a specific embodiment of the connection speed limiting mechanism, the connection speed limiting mechanism is configured as follows: the end part of the first spiral structure 21 is provided with a first speed limiting gear 23 engaged with the end part of the driven wheel 11, the end part of the output end of the second spiral structure 22 penetrating through the middle fixing plate 7 is provided with a second speed limiting gear 24, and the second speed limiting gear 24 is used for transmitting power to the speed regulating end of the speed changing mechanism;

it can be understood that, in this embodiment, the driven wheel 11 of the speed adjusting mechanism is connected between the first side plate 5 and the middle fixing plate 7 through a connecting shaft, two ends of the connecting shaft are fixed, the driven wheel 11 is sleeved on the connecting shaft through a bearing 8, or two ends of the driven wheel are connected through the bearing 8, and the driven wheel 11 is fixed on the connecting shaft, so as to realize rotation; the first spiral structure 21 is rotatably connected between the two plates through a connecting shaft, the end part of the connecting shaft of the second spiral structure 22 passes through the middle fixing plate 7, and is meshed with the second speed-limiting gear 24 of the speed-changing mechanism through the second speed-limiting gear 24 at the end part of the connecting shaft, so that power is transmitted, and the connecting shaft is rotatably connected with the two plates through the bearing 8 to realize synchronous rotation; wherein the second speed limiting gear 24 is not fully visible in the drawings, but this does not affect the description of the solution.

Referring to fig. 3, as a redundancy scheme, the first spiral structure 21 and the second spiral structure 22 are provided with balls on their side surfaces, and the balls are arranged along the spiral direction of the spiral structure; by providing the spiral structure with balls that spiral in the same direction, friction can be reduced when the first spiral structure 21 and the second spiral structure 22 rotate at the same speed in the same direction.

Referring to fig. 2, as an embodiment for achieving stable power output through the speed change mechanism, the following are provided: the speed change mechanism comprises a power output gear 31, a fourth power input gear 32 and a speed regulation gear 33 which are all conical teeth, wherein the power output gear 31 and the speed regulation gear 33 are sleeved on the main shaft 4, are oppositely arranged and can rotate around the axis of the main shaft; the main shaft 4 is also sleeved with a second variable speed transmission gear 35, the output end of the speed limiting mechanism transmits power to the second variable speed transmission gear 35, and the second variable speed transmission gear 35 is connected with the speed regulating gear 33 and synchronously rotates; the speed regulation end of the speed change mechanism comprises a third power input gear 3, the third power input gear 3 is meshed with the first power input gear 1, a connecting shaft of the third power input gear 3 sequentially penetrates through the end parts of the first side plate 5 and the middle fixing plate 7 and is provided with a power transmission gear 36, the power transmission gear 36 is meshed with a first speed change transmission gear 34 sleeved on the main shaft 4, a fourth power input gear 32 is eccentrically connected with the side surface of the first speed change transmission gear 34, the fourth power input gear 32 is parallel to the axis of the main shaft 4, and the first speed change transmission gear 34 is used for driving the fourth power input gear 32 to rotate around the axis of the main shaft 4; two sides of the fourth power input gear 32 are respectively meshed with the power output gear 31 and the speed regulating gear 33;

it can be understood that, in the present embodiment, the third power gear is meshed with the first power gear and is connected to the power transmission gear 36 through a connecting shaft, and the connecting shaft passes through the first side plate 5 and the middle fixing plate 7 in sequence and is rotated through the bearing 8; the power transmission gear 36 is meshed with the first speed change gear, so that the first speed change gear drives the fourth power input gear 32 to revolve, namely, the fourth power input gear 32 rotates around the axis of the main shaft 4, power is respectively distributed to the power output gear 31 and the speed regulation gear 33 on two sides in the rotation process of the fourth power input gear 32, at this time, the fourth power input gear 32, the power output gear 31 and the speed regulation gear 33 form a differential structure, the rotation of the fourth power input gear 32 is decomposed into the rotation of the power output gear 31 and the speed regulation gear 33, the rotation speed relationship is 2W32= W21 W33, and the speed regulation gear 33 is limited by the speed regulation mechanism and the speed limitation mechanism, so that the power output gear 31 can change along with the change of the transmission ratio between the driving wheel 10 and the driven wheel 11, the effect of stepless speed change is achieved, and stable power output is achieved.

Referring to fig. 2, as an embodiment for preventing the transmission between the speed adjusting gear 33 and the second speed changing gear from affecting the transmission of the first speed changing gear, the following is provided: the first speed change transmission gear 34 is positioned between the speed regulation gear 33 and the second speed change transmission gear 35, a cylinder is connected between the speed regulation gear 33 and the second speed change transmission gear 35, the cylinder passes through the middle part of the first speed change transmission gear 34, and the first speed change transmission gear 34 is sleeved on the cylinder through the bearing 8;

it can be understood that, in this embodiment, the speed regulating gear 33 is connected to the second variable transmission gear 35 through a cylinder, and the cylinder is connected to the active connection through the bearing 8 to realize transmission, wherein the bearing 8 is not shown in the drawing, and the cylinder is connected to the second variable transmission gear 35 through a key to realize synchronous rotation; the first speed changing gear is sleeved on the cylinder through the bearing 8, so that the rotation of the first speed changing gear and the rotation of the second speed changing gear are not influenced, and a rotation space of the fourth power input gear 32 can be reserved.

The working principle is as follows: the first power input gear 1 distributes power to a driving wheel 10 of a speed regulating mechanism and a first variable speed transmission gear 34 of the speed regulating mechanism respectively, in the speed regulating mechanism, a steel rope 15 can be pulled according to an external speed regulator, so that a plectrum 12 drives the driving wheel 10 to slide, the transmission ratio between the driving wheel 10 and a driven wheel 11 is changed, and the driven wheel 11 drives a first spiral structure 21 of the speed limiting mechanism to rotate; in the speed change mechanism, the first speed change transmission gear 34 drives the fourth power input gear 32 to rotate, so that torque is distributed to the power output gear 31 and the speed regulation gear 33 on two sides through the fourth power input gear 32, wherein the speed regulation gear 33 realizes transmission through the second speed regulation gear 24 and the second spiral structure 22, so as to drive the second spiral structure 22 to rotate, at this time, the first spiral structure 21 and the second spiral structure 22 in the speed regulation mechanism are both driven by torque from the outside, the first spiral structure 21 and the second spiral structure 22 rotate in the same direction, but the spiral structures in the speed regulation mechanism enable the first spiral structure 21 and the second spiral structure 22 to rotate only at the same speed, so that the first spiral structure 21 limits the rotating speed of the second spiral structure 22, the second spiral structure 22 limits the torque of the speed regulation gear 33 of the speed change mechanism in turn, so as to enable the torque of the speed regulation gear 33 of the speed change mechanism to be controllable, and when the torques of the speed change gear 33 and the fourth power input gear 32 of the speed change mechanism are controllable, the speed change mechanism outputs the controllable w31 according to the speed change mechanism; if the power distributed by the power distribution mechanism is constant, the power of the input end of the speed regulating mechanism and the power of the input end of the speed changing mechanism are constant at the moment, the input end of the speed regulating mechanism is connected with the speed limiting mechanism, the speed limiting mechanism is connected with the speed regulating gear 33 of the speed changing mechanism, the torque of the speed regulating gear 33 of the speed changing mechanism is constant through the spiral speed limiting structure of the speed limiting mechanism, and when the speed regulating gear 33 of the speed changing mechanism and the fourth power input gear 32 of the speed regulating mechanism are constant, the power of the output end is constant, so that the stable non-slip continuously variable transmission with large transmission torque and high transmission efficiency is formed.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A continuously variable transmission is characterized by comprising a power distribution mechanism, a speed regulating mechanism, a speed limiting mechanism and a speed changing mechanism;

the input end and the output end of the speed limiting mechanism are respectively a first spiral structure (21) and a second spiral structure (22), the first spiral structure (21) and the second spiral structure (22) are both spiral structures with the same structure and can rotate around the axis of the first spiral structure and the second spiral structure (22), and the side surfaces of the first spiral structure (21) and the second spiral structure (22) are in spiral meshing with each other and rotate in the same direction.

2. The variable transmission according to claim 1, further comprising a main shaft (4), wherein a first side plate (5) and a second side plate (6) are respectively sleeved at two ends of the main shaft (4), and an intermediate fixing plate (7) is further sleeved on the main shaft (4) between the first side plate (5) and the second side plate (6); speed adjusting mechanism and speed limit mechanism all are located between first sideboard (5) and middle fixed plate (7), speed adjusting mechanism is located between second sideboard (6) and middle fixed plate (7), power distribution mechanism is first power input gear (1), first power input gear (1) cover is located on main shaft (4), and is located first sideboard (5) outside, first power input gear (1) can be rotatory around self axis.

3. A continuously variable transmission as claimed in claim 2, characterized in that the intermediate fixed plate (7) and the first side plate (5) are fixed to the main shaft (4), the output of the transmission mechanism drives the second side plate (6) to rotate, a housing (9) is connected between opposite sides of the first side plate (5) and the second side plate (6), the housing (9) is fixedly connected to the second side plate (6) and rotatably connected to the first side plate (5), and the housing (9) can rotate around its axis.

4. A continuously variable transmission as claimed in claim 3, characterised in that the governor mechanism comprises a second power input gear (2), the second power input gear (2) is in mesh with the first power input gear (1), the input shaft of the second power input gear (2) is connected through the first side plate (5) and one end of a universal joint connecting shaft (13), and the other end of the universal joint connecting shaft (13) is rotatably connected with the intermediate fixing plate (7); a sliding shaft (14) and a driven wheel (11) are further arranged between the first side plate (5) and the middle fixing plate (7), a shifting piece (12) is connected onto the sliding shaft (14) in a sliding manner, a driving wheel (10) is connected onto the universal joint connecting shaft (13) in a sliding manner, the driven wheel (11) is conical, and the driving wheel (10) is in transmission connection with the side face of the driven wheel (11); the sliding shaft (14) and the universal joint connecting shaft (13) are parallel to the side surface of the driven wheel (11); the shifting piece (12) is connected with a speed regulator through a steel rope (15), the speed regulator is used for driving the shifting piece (12) to slide, and the shifting piece (12) is used for driving the driving wheel (10) to slide.

5. Continuously variable transmission according to claim 4, characterized in that the said pick (12) is U-shaped, the said pick (12) snapping the said driving wheel (10) inside.

6. A continuously variable transmission as claimed in claim 4, characterized in that the driving pulley (10) and the driven pulley (11) are in frictional driving connection with each other.

7. A continuously variable transmission as claimed in claim 4, characterised in that the first spiral structure (21) is provided at its end with a first speed limiting gear (23) which meshes with the end of the driven wheel (11), the output of the second spiral structure (22) is provided at its end which passes through the intermediate fixing plate (7) with a second speed limiting gear (24), the second speed limiting gear (24) being adapted to transmit power to the speed governing end of the transmission.

8. A continuously variable transmission as claimed in claim 7, characterized in that the first helical structure (21) and the second helical structure (22) are flanked by balls, which are arranged in the helical direction of the helical structures.

9. The continuously variable transmission according to claim 4, wherein the speed change mechanism comprises a power output gear (31), a fourth power input gear (32) and a speed regulation gear (33), which are all of tapered teeth, and the power output gear (31) and the speed regulation gear (33) are both sleeved on the main shaft (4), are arranged oppositely, and can rotate around the axes of the power output gear and the speed regulation gear; a second variable transmission gear (35) is further sleeved on the main shaft (4), the output end of the speed limiting mechanism transmits power to the second variable transmission gear (35), and the second variable transmission gear (35) is connected with the speed regulating gear (33) and synchronously rotates; the speed regulation end of the speed change mechanism comprises a third power input gear (3), the third power input gear (3) is meshed with the first power input gear (1), a connecting shaft of the third power input gear (3) sequentially penetrates through the end parts of the first side plate (5) and the middle fixing plate (7) and is provided with a power transmission gear (36), the power transmission gear (36) is meshed with a first speed change transmission gear (34) sleeved on the main shaft (4), a fourth power input gear (32) is eccentrically connected with the side surface of the first speed change transmission gear (34), the fourth power input gear (32) is parallel to the axis of the main shaft (4), and the first speed change transmission gear (34) is used for driving the fourth power input gear (32) to rotate around the axis of the main shaft (4); two sides of the fourth power input gear (32) are respectively meshed with the power output gear (31) and the speed regulating gear (33).

10. The variable transmission according to claim 9, wherein the first variable transmission gear (34) is located between the speed adjusting gear (33) and the second variable transmission gear (35), a cylinder is connected between the speed adjusting gear (33) and the second variable transmission gear (35), the cylinder passes through the middle of the first variable transmission gear (34), and the first variable transmission gear (34) is sleeved on the cylinder through a bearing.