CN106954429B

CN106954429B - Transmission system

Info

Publication number: CN106954429B
Application number: CN201710197139.3A
Authority: CN
Inventors: 陆利强; 张福祥; 金卫星; 章呈杰
Original assignee: Xingguang Agricultural Machine Co Ltd
Current assignee: Xingguang Agricultural Machine Co Ltd
Priority date: 2017-03-29
Filing date: 2017-03-29
Publication date: 2022-10-11
Anticipated expiration: 2037-03-29
Also published as: CN106954429A

Abstract

The invention relates to a transmission system, in particular to a transmission system for a crawler-type walking harvester. The hydraulic pump comprises a first motor, a second motor, a transmission case, a first hydraulic pump and a second hydraulic pump; the first hydraulic pump includes a first pump control member rotatable about a fixed axis, the first hydraulic pump controls the first motor through a rotation angle of the first pump control member, and the second hydraulic pump controls the second motor through a rotation angle of the second pump control member.

Description

Transmission system

Technical Field

The invention relates to a transmission system, in particular to a transmission system for a crawler-type walking harvester.

Background

The contact area of the crawler belt and the ground is larger than that of the wheels, the unit area is stressed little, so that the vehicle is not easy to sink, the plough bottom layer cannot be damaged, and the crawler belt has good paddy field walking performance, so that the crawler belt is widely applied to agricultural machinery, such as a harvester, a cultivator and the like. The hydraulic transmission crawler-type harvester comprises a transmission control system and a hydraulic pump. The hydraulic pump is driven by the engine, oil is sucked from the hydraulic tank, pressure oil is formed and discharged and is sent to the motor for controlling the two crawler wheels to walk, and therefore walking control of the harvester is achieved. The existing hydraulic transmission crawler-type harvester can realize the forward and backward walking of the harvester by controlling the two motors to rotate at the same rotating speed and direction; the steering walking of the harvester can be realized by controlling the two motors to rotate at different rotating speeds or in different directions. By operating the hydraulic pump control panel, the oil pressure output to the motor can be controlled, thereby controlling the rotation speed and steering of the motor. The rotation angle and direction of the hydraulic pump control panel can control the motor: the rotation direction of the hydraulic pump control plate correspondingly controls the rotation direction of the motor, and the rotation angle of the hydraulic pump correspondingly controls the rotation speed of the motor.

The hydraulic transmission crawler-type harvester in the prior art has the following two control modes:

the first mode is a single-rod walking and double-rod steering control mode: the forward movement or the backward movement of the harvester is controlled by simultaneously operating a hydraulic pump control plate for controlling the two motors by adopting an operating rod; in addition, two operating rods are adopted to respectively operate hydraulic pump control plates for controlling the two motors so as to control the steering of the harvester.

The second is a single-rod walking and single-rod steering control mode: the forward movement or the backward movement of the harvester is controlled by simultaneously operating a hydraulic pump control plate for controlling the two motors by adopting an operating rod; in addition, an operating rod is adopted to respectively operate hydraulic pump control plates for controlling the two motors so as to control the steering of the harvester.

In the first control mode, the driver is required to switch the operation among the three operation levers, and the maneuverability is obviously poor for the driver with only two hands.

The second control mode can only carry out constant-speed steering on the spot: the two crawler wheels rotate oppositely at the same speed to realize steering, and after the steering is finished, the crawler wheels cannot automatically return to the running speed before the steering, the turning speed is too high, danger is caused, and the driving experience is realized.

Disclosure of Invention

The invention provides a transmission system which can realize single-rod operation of a harvester and realize turning of two crawler wheels at different speeds and magnitudes, and aims to solve the technical problems.

A transmission system, characterized by: comprises a first motor, a second motor, a transmission case and a duplex hydraulic pump; the dual hydraulic pump includes a first pump control member and a second pump control member each rotatable about a respective fixed axis, the dual hydraulic pump controlling the first motor by a rotational angle of the first pump control member, the dual hydraulic pump controlling the second motor by a rotational angle of the second pump control member; the transmission case comprises a first sliding block, a second sliding block, a first sliding groove and a second sliding groove, the first sliding block makes circular motion around a fixed axis at a fixed radius, the second sliding block can make circular motion around the fixed axis at a fixed radius, the first sliding block is slidably mounted in the first sliding groove, the second sliding block is slidably mounted in the second sliding groove, the first sliding groove can rotate around the center of the first sliding groove, the second sliding groove can rotate around the center of the second sliding groove, the first sliding groove and the second sliding groove can translate along the centers of the first sliding groove and the second sliding groove, the moving track of the first sliding groove is intersected with the moving track of the first sliding block, and the moving track of the second sliding groove is intersected with the moving track of the second sliding block; the first sliding block is in transmission connection with the first pump control part, and the second sliding block is in transmission connection with the second pump control part.

Preferably, the transmission box comprises a first transmission control structure and a second transmission control structure, and the first transmission control structure comprises a first transmission control part; the first transmission control part is connected with the first pump control part through a first connecting rod, and the second transmission control part is connected with the second pump control part through a second connecting rod; the first transmission control part can rotate around a fixed axis, and the second transmission control part can rotate around the fixed axis; the first transmission control part is connected with the first sliding block, so that the first transmission control part can rotate by the same angle along with the first sliding block, the second transmission control part is connected with the second sliding block, and the second transmission control part can rotate by the same angle along with the second sliding block.

Preferably, the transmission case comprises a variable-speed rotating shaft and a steering gear; the variable-speed rotating shaft is in transmission connection with the first sliding chute and the second sliding chute, so that the variable-speed rotating shaft can drive the first sliding chute and the second sliding chute to synchronously rotate by the same angle; the first sliding groove is arranged on the first sliding seat, and the second sliding groove is arranged on the second sliding seat; the steering gear is in transmission connection with the first sliding seat and the second sliding seat, so that the steering gear can drive one of the first sliding seat and the second sliding seat to move along the direction of the speed change rotating shaft while keeping the other sliding seat static.

Preferably, the variable-speed rotating shaft is in transmission connection with the first sliding groove through a first connecting assembly, and the variable-speed rotating shaft is in transmission connection with the second sliding groove through a second connecting assembly, so that when the variable-speed rotating shaft rotates, the first connecting assembly can push the first sliding groove to rotate around the axis of the first sliding groove in a plane perpendicular to a rotating plane of the variable-speed rotating shaft; the second connecting assembly is connected with the second sliding groove, so that when the variable-speed rotating shaft rotates, the second connecting assembly can push the second sliding groove to rotate around the axis of the second sliding groove in a plane perpendicular to the rotating plane of the variable-speed rotating shaft.

Preferably, the first connecting assembly comprises a first connecting seat coaxially arranged outside the variable rotation shaft and capable of rotating synchronously with the variable rotation shaft, and a first connecting rod fixedly arranged on the first connecting seat; the first connecting seat comprises a bulge extending along the radial direction of the variable speed rotating shaft, one end of the first connecting rod is connected to the bulge, and the other end of the first connecting rod is connected to the side surface of the first sliding groove; the second connecting assembly comprises a second connecting seat and a second connecting rod, the second connecting seat is coaxially arranged outside the variable-speed rotating shaft and can synchronously rotate with the variable-speed rotating shaft, and the second connecting rod is fixedly arranged on the second connecting seat; the second connecting seat comprises a bulge extending along the radial direction of the variable speed rotating shaft, one end of the second connecting rod is connected to the bulge, and the other end of the second connecting rod is connected to the side face of the second sliding groove.

Preferably, the variable-speed rotating shaft is a spline shaft, the first connecting seat comprises a first spline sleeve matched with the spline shaft, and the second connecting seat comprises a second spline sleeve matched with the spline shaft.

Preferably, the transmission case further comprises a slide carriage control assembly; the sliding seat control assembly comprises a limiting part and a sliding control part, the first sliding seat and the second sliding seat are slidably mounted on the limiting part, and the steering gear is in transmission connection with the sliding control part and is used for controlling the sliding control part to move along a direction parallel to the speed change rotating shaft; the slide controls include a first slide control and a second slide control; when the slide control member moves in a direction parallel to the shift spindle: the first carriage control is in contact with the first carriage while the second carriage control is separated from the second carriage such that the first carriage moves with the slide control; or the first carriage control is separated from the first carriage while the second carriage control is in contact with the second carriage such that the second carriage moves with the slide control.

Preferably, the slide control member includes a rack disposed in a direction parallel to the shift rotary shaft; the steering gear is in transmission connection with the rack; the first sliding seat control part is arranged at one end, close to the first sliding seat, of the rack, and the second sliding seat control part is arranged at one end, close to the second sliding seat, of the rack.

Preferably, the first carriage includes a first slide control for cooperating with the first carriage control, the second carriage includes a second slide control for cooperating with the second carriage control; the first and second slide controls are located between the first and second slide controls in a direction of the shift spindle.

Preferably, the transmission case further comprises an elastic return structure, and the elastic return structure can enable the first sliding seat and the second sliding seat to be away from each other along the direction of the speed change rotating shaft.

Preferably, the elastic return structure is a return spring sleeved on the outer surface of the variable speed rotating shaft, and the return spring is arranged between the first connecting seat and the second connecting seat.

Preferably, the first slider is a cylindrical slider, and the second slider is a cylindrical slider.

Drawings

FIG. 1 is a schematic illustration of the transmission system at rest.

Fig. 2 shows a schematic representation of the transmission case in a stationary state.

FIG. 3 is a schematic representation of the transmission in a forward travel state.

FIG. 4 is a schematic view of the transmission in the forward motion state.

FIG. 5 is a schematic representation of the transmission in the reverse state.

FIG. 6 is a schematic view of the transmission in the reverse state.

FIG. 7 is a schematic view of the transmission system in a cornering situation.

Fig. 8 shows a schematic view of the transmission in a turning situation.

Fig. 9 is a front view of the transmission case.

FIG. 10 is a top view of the transmission.

FIG. 11 is a side view of the transmission.

Fig. 12 is a perspective view of the transmission case.

Fig. 13 is a schematic top view of the transmission structure in the transmission case.

Fig. 14 is a schematic side view of the transmission structure in the transmission case.

Fig. 15 is a schematic front view of the transmission structure of the transmission case upper cover.

Detailed Description

Example one

A drive control system for a hydraulically driven tracked harvester is shown in fig. 9-15. The harvester comprises a first motor 1a for driving a first crawler wheel of the harvester, a second motor 1b for driving a second crawler wheel of the harvester, a hydraulic pump 2, an engine 3, a transmission case 4, a variable speed push rod 5 for controlling the harvester to walk forwards and backwards, and a steering wheel operating rod 6 for controlling the harvester to turn.

The hydraulic pump 2 is a duplex hydraulic pump, and is driven by the engine 3 to suck oil from a hydraulic oil tank to form pressure oil which is respectively discharged to the first motor 1a and the second motor 1b in two ways. The hydraulic pump 2 includes a first pump control plate 2a corresponding to the control motor one 1a and a second pump control plate 2b corresponding to the control motor two 1b. The first pump control panel 2a and the second pump control panel 2b are oppositely disposed on the top of the hydraulic pump 2, and one ends thereof are respectively provided with a rotating shaft fixedly connected to the top of the hydraulic pump, so that the two pump control panels can be rotated about the rotating shafts of the respective ends. The two pump control plates control the rotating speed and the direction of the first motor and the second motor through the rotating angle and the rotating direction of the two pump control plates, and the control directions of the two pump control plates are opposite. For example, the first pump control plate 2a in this embodiment rotates counterclockwise by a certain angle to control the motor to rotate in the forward direction, thereby controlling the first track wheel to rotate forward at a certain speed; the first pump control plate 2a rotates clockwise by a certain angle to control the motor to rotate in the reverse direction, so that the first crawler wheel is controlled to rotate backwards at a certain speed; and the rotating speed of the first motor and the rotating speed of the first crawler wheel are in direct proportion to the rotating angle of the first pump control plate. The second pump control plate 2b rotates clockwise by a certain angle to control the second motor to rotate forwards, so that the second crawler wheel is controlled to rotate forwards at a certain speed; the second pump control plate 2b rotates anticlockwise by a certain angle to control the motor to rotate reversely, so that the second crawler wheel is controlled to rotate backwards at a certain speed; the rotating speed of the second motor and the rotating speed of the second crawler wheel are in direct proportion to the rotating angle of the second pump control plate.

The transmission case 4 includes a case body formed by an upper case cover 41 and a lower case body 42, and a transmission system provided in the case body. One side of the transmission case is provided with a first input interface 431 for mounting and connecting the speed change push rod 5, the other side of the transmission case is provided with a second input interface 432 for mounting and connecting the steering wheel operating rod 6, and the top of the upper case cover 41 is provided with a first output interface 44a corresponding to the first pump control plate 21 and a second output interface 44b corresponding to the second pump control plate 22. The first output interface 44a is provided with a first transmission control rotating shaft 711a, and the first transmission control rotating shaft 711a is installed in the first output interface 44a through a bearing sleeve sleeved on the middle section of the first transmission control rotating shaft 711a, so that the first transmission control rotating shaft 711a can rotate in the first output interface 44 a. One end of the first transmission control rotating shaft 711a is provided with a first transmission control plate 712a, and the other end of the first transmission control rotating shaft 711a passes through the upper case cover 41 of the transmission case and is connected to the top surface of the end of the first control output plate 722a located in the case. The movable end of the first transmission control plate 712a at the end of the first transmission control rotation shaft 711a is connected to the movable end of the first pump control plate 2a by a rigid first link 8 a. A first slider 721a having a substantially cylindrical shape is disposed on the bottom surface of the other end of the first control output plate 772a, so that the first slider 721a can drive the first transmission control rotating shaft 711a to rotate through the first control output plate 722a, and thus the first transmission control plate 712a at the other end of the first transmission control rotating shaft 711a is driven to rotate around the first transmission control rotating shaft 711a, and further, the first connecting rod 8a is driven to rotate by a certain angle corresponding to the first pump control plate 2a linked therewith. The second output interface 44b is provided with a second transmission control rotating shaft 711b, and the second transmission control rotating shaft 711b is installed in the second output interface 44b through a bearing sleeve sleeved on the middle section of the second transmission control rotating shaft 711b, so that the second transmission control rotating shaft 711b can rotate in the second output interface 44b. One end of the second transmission control rotating shaft 711b is provided with a second transmission control plate 712b, and the other end of the second transmission control rotating shaft 711b passes through the upper case cover 41 of the transmission case and is connected to the top surface of the end of the second control output plate 722b in the case. The movable end of the second transmission control plate 712b located at the end of the second transmission control rotation shaft 711b is connected to the movable end of the second pump control plate 2b by a rigid second link 8 b. A second slider 721b having a substantially cylindrical shape is disposed on the bottom surface of the other end of the second control output plate 772a, so that the second slider 721b can drive the second transmission control rotating shaft 711b to rotate through the second control output plate 722b, thereby driving the second transmission control plate 712b at the other end of the second transmission control rotating shaft 711b to rotate around the second transmission control rotating shaft 711b, and further, the second pump control plate 2b linked with the second transmission control rotating shaft 711b via the second connecting rod 8b rotates a certain angle.

There are two spouts in the transmission case 4: a first slide block 721a is slidably mounted in the first slide groove 751a, and a second slide block 721b is slidably mounted in the second slide groove 751 b. The first and second sliding

grooves

751a and 751b are identical in structure and are installed in the transmission case by first and

second sliders

741a and 741b, respectively. A limiting member 7421 (a rod-shaped limiting rod in this embodiment) transversely disposed in the transmission case is further disposed in the transmission case 4, and the first sliding seat 741a and the second sliding seat 741b are slidably connected to the limiting member 7421. The limiting member 7421 limits the movement of the two sliders in the transverse direction between the first output interface and the second output interface. The center of the first sliding groove 751a is fixed on the first slide 741a, so that the first sliding groove 751a can rotate around the center thereof; the center of the second sliding groove 751b is fixed to the second carriage 741b so that the second sliding groove 751b can rotate around the center thereof.

A shifting rotating shaft 731 parallel to the limiting member 7421 is disposed on one side of the limiting member 7421, and a first connecting seat 7321a and a second connecting seat 7321b are sleeved on the outer circumference of the shifting rotating shaft 731. The outer surface of the speed change rotating shaft 731 is provided with a key groove along the length direction of the speed change rotating shaft, the inner surfaces of the first connecting seat 7321a and the second connecting seat 7321b are also provided with key grooves, and the first connecting seat 7321a and the second connecting seat 7321b sleeved outside the speed change rotating shaft 731 can be matched with a speed change rotating shaft key, so that the first connecting seat and the second connecting seat can not only move along the speed change rotating shaft but also synchronously rotate along with the speed change rotating shaft. The first connecting seat 7321a has a surface circumference extending outward in the radial direction of the shifting rotating shaft 731 to form a protrusion 73211. The first connecting seat 7321a and the first sliding chute 751a are connected by a rigid first connecting rod 7322a, one end of the first connecting rod 7322a is fixed to the protrusion 73211 of the first connecting seat 7321a, and the other end of the first connecting rod 7322a is fixedly connected to one side of the end of the first sliding chute 751 a. The surface circumference of the second connecting seat 7321b extends outward along the radial direction of the variable speed rotating shaft 731 to form a protrusion 73211. The second connecting seat 7321b and the second sliding groove 751b are connected by a rigid second connecting rod 7322b, one end of the second connecting rod 7322b is fixed to the protrusion 73211 of the second connecting seat 7321b, and the other end of the second connecting rod 7322b is fixed to one side of the end of the second sliding groove 751 b. The connection between the first connecting rod 7322a and the first sliding groove 751a and the connection between the second connecting rod 7322b and the second sliding groove 751b are both the outside of the two sliding grooves or both the inside of the two sliding grooves. The variable-speed push rod 5 is in transmission connection with the variable-speed rotating shaft through the first control input port, the variable-speed rotating shaft is driven to rotate through the variable-speed push rod, the first sliding groove and the second sliding groove are simultaneously pushed by the connecting rods on the first connecting seat and the second connecting seat which synchronously rotate along with the variable-speed rotating shaft, and therefore the first sliding groove and the second sliding groove rotate by the same angle in opposite directions with respective centers.

The other side of the limiting member 7421 is provided with a sliding control member 7422, and the sliding control member 7422 is slidably disposed along a direction parallel to the speed-changing rotation axis. A rack 74222 parallel to the shift rotation shaft is disposed on the opposite side of the slide controller 7421, and a first slide controller 74221a and a second slide controller 74221b are disposed on the opposite ends of the slide controller 7422 from the stopper 7421. The rack 74222 is in driving connection with the steering wheel operating lever 6 through the steering gear 743, the steering wheel operating lever 6 drives the rotation gear 743 to rotate, and the rack 74211 of the slide control member 7422 is driven to rotate with the rotation gear 743, such that the slide control member 7422 moves in a direction parallel to the shift rotation axis, further resulting in movement of the first slide control member 74221a and the second slide control member 74221b on the slide control member 7422. The first slide 741a is provided with a first slide control 7411a for cooperation with the first slide control 74221a, and the second slide 741b is provided with a second slide control 7411b for cooperation with the second slide control 74221b. When the slide control 7422 is driven by the steering wheel lever to move to one side along the length of the rack, the first slide control 74221a on the slide control 7422 contacts the first slide control 7411a while keeping the second slide control 74221b separated from the second slide control 7411b, such that the first slide 741a moves with the slide control 7422 while the second slide 741b remains stationary; when the slide control 7422 is moved by the steering wheel lever toward the other side along the length of the rack, the second slide control 74221b on the slide control 7422 contacts the second slide control 7411b while keeping the first slide control 74221a separated from the first slide control 7411a, such that the second slide 741a moves with the slide control 7422 while the first slide 741a remains stationary.

In this embodiment, the drive train is shown in fig. 1 when the harvester is at rest, and the state in the drive box is shown in fig. 2. The first and

second carriages

741a and 741b are respectively disposed at both ends of the shifting rotary shaft 731, and the first and

second chutes

751a and 751b are parallel to the shifting rotary shaft 731. An extension line of the first driving control rotation shaft 711a passes through the center of the first sliding groove 751a, and an extension line of the second driving control rotation shaft 711b passes through the center of the second sliding groove 751 b.

The variable-speed push rod 5 is in transmission connection with the variable-speed rotating shaft through the first control input port, drives the variable-speed rotating shaft to rotate through the variable-speed push rod, and simultaneously pushes the first sliding groove and the second sliding groove along with the connecting rods on the first connecting seat and the second connecting seat which synchronously rotate along with the variable-speed rotating shaft, so that the first sliding groove and the second sliding groove rotate by the same angle in opposite directions at respective centers. So that the harvester starts to walk forwards or backwards, the transmission system is shown in figures 3 and 4, and the bodies in the transmission box are shown in figures 5 and 6.

When the harvester needs to turn during walking, the sliding control piece is driven to move through the steering wheel operating rod 6, one sliding seat is driven to be close to the other sliding seat, and meanwhile, the connecting seat connected with the moving sliding seat is synchronously moved along the variable-speed rotating shaft of the sliding seat along with the movement of the sliding seat. The driver does not operate the speed change push rod 5 in the turning process, and the inclination angles of the first sliding groove and the second sliding groove can be kept unchanged when the connecting seat moves along the speed change rotating shaft. Therefore, as shown in fig. 8, the length directions of the first sliding chute and the second sliding chute during walking are not parallel to the moving direction of the sliding seat, and an included angle a is kept. As the first and

second chutes

751a and 751b approach each other, the first and

second chutes

751a and 751b in this embodiment are described as an example, and the distance between the first transmission control shaft 711a and the first chute 751 (the center of the first chute) changes. During the movement of the first sliding chute 751a, the first slide 721a in the first sliding chute 751a will move along the first sliding chute to adjust to the new position of the first sliding chute. And the moving track of the first slider 721a connected to the first transmission control shaft 711a through the first transmission control plate 712a is limited to a circle of a fixed radius centered on the first transmission control shaft 711a, thereby causing the first slider 721a to rotate about the first transmission control plate 712a, thereby changing the angle of the first pump control plate (see fig. 7) and varying the rotation speed of the first motor. In the whole process, the position and the angle of the second sliding groove are not changed, so that the second pump control plate still keeps the original angle, and the second motor keeps the original rotating state. Therefore, the first motor and the second motor have a rotation speed difference to realize turning.

In this embodiment, a return spring 761 is disposed between the outer circumference of the shift rotating shaft 731 and the first and

second connection seats

7321a and 7321b. When the turning is finished, the driving force exerted by the steering wheel operating lever disappears, and the first sliding seat which is originally close to the second sliding seat returns to the end part of the speed change rotating shaft again away from the second sliding seat under the action of the return spring. In the process, the angle a between the first sliding chute and the moving direction is still kept due to the existence of the first connecting seat. So that the angle of the first pump control plate is returned to the angle before turning. Therefore, the harvester is enabled to continue to run according to the running speed before turning after the turning is finished.

The above examples are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solution should be made by those skilled in the art without departing from the design concept of the present invention, and the technical content of the present claims is fully described in the claims.

Claims

1. A transmission system, characterized by: comprises a first motor, a second motor, a transmission case and a duplex hydraulic pump; the dual hydraulic pump includes first and second pump control members rotatable about respective fixed axes; the dual hydraulic pump controls the first motor through a rotational angle of the first pump control, the dual hydraulic pump controls the second motor through a rotational angle of the second pump control; the transmission box comprises a first sliding block, a second sliding block, a first sliding groove and a second sliding groove, wherein the first sliding block makes circular motion around a fixed axis at a fixed radius, the second sliding block can make circular motion around the fixed axis at the fixed radius, the first sliding block is slidably mounted in the first sliding groove, the second sliding block is slidably mounted in the second sliding groove, the first sliding groove can rotate around the center of the first sliding groove, the second sliding groove can rotate around the center of the second sliding groove, the first sliding groove and the second sliding groove can translate along a connecting line of the centers of the first sliding groove and the second sliding groove, the moving track of the first sliding groove is intersected with the moving track of the first sliding block, and the moving track of the second sliding groove is intersected with the moving track of the second sliding block; the first sliding block is in transmission connection with the first pump control part, and the second sliding block is in transmission connection with the second pump control part;

the transmission case comprises a first transmission control structure, a second transmission control structure, a variable speed rotating shaft and a steering gear;

the first transmission control structure comprises a first transmission control member, and the second transmission control structure comprises a second transmission control member; the first transmission control part is connected with the first pump control part through a first connecting rod, and the second transmission control part is connected with the second pump control part through a second connecting rod; the first transmission control part can rotate around a fixed axis, and the second transmission control part can rotate around the fixed axis; the first transmission control part is connected with the first sliding block, so that the first transmission control part can rotate by the same angle along with the first sliding block, the second transmission control part is connected with the second sliding block, and the second transmission control part can rotate by the same angle along with the second sliding block;

the variable-speed rotating shaft is in transmission connection with the first sliding chute and the second sliding chute, so that the variable-speed rotating shaft can drive the first sliding chute and the second sliding chute to synchronously rotate by the same angle; the first sliding groove is arranged on the first sliding seat, and the second sliding groove is arranged on the second sliding seat; the steering gear is in transmission connection with the first sliding seat and the second sliding seat, so that the steering gear can drive one of the first sliding seat and the second sliding seat to move along the direction of the speed change rotating shaft while keeping the other sliding seat static;

the first sliding block is a cylindrical sliding block, and the second sliding block is a cylindrical sliding block.

2. A transmission system according to claim 1, wherein: the variable-speed rotating shaft is in transmission connection with the first sliding groove through a first connecting assembly, and the variable-speed rotating shaft is in transmission connection with the second sliding groove through a second connecting assembly, so that when the variable-speed rotating shaft rotates, the first connecting assembly can push the first sliding groove to rotate around the axis of the first sliding groove in a plane perpendicular to the rotating plane of the variable-speed rotating shaft; the second connecting assembly is connected with the second sliding groove, so that when the variable-speed rotating shaft rotates, the second connecting assembly can push the second sliding groove to rotate around the axis of the second sliding groove in a plane perpendicular to the rotating plane of the variable-speed rotating shaft.

3. A transmission system according to claim 2, wherein: the first connecting assembly comprises a first connecting seat and a first connecting rod, wherein the first connecting seat is coaxially arranged outside the variable-speed rotating shaft and can synchronously rotate with the variable-speed rotating shaft; the first connecting seat comprises a bulge extending along the radial direction of the variable-speed rotating shaft, one end of the first connecting rod is connected to the bulge, and the other end of the first connecting rod is connected to the side surface of the first sliding groove; the second connecting assembly comprises a second connecting seat and a second connecting rod, the second connecting seat is coaxially arranged outside the speed change rotating shaft and can synchronously rotate with the speed change rotating shaft, and the second connecting rod is fixedly arranged on the second connecting seat; the second connecting seat comprises a bulge extending along the radial direction of the variable speed rotating shaft, one end of the second connecting rod is connected to the bulge, and the other end of the second connecting rod is connected to the side face of the second sliding groove.

4. A transmission system according to claim 3, wherein: the variable speed rotating shaft is a spline shaft, the first connecting seat comprises a first spline sleeve matched with the spline shaft, and the second connecting seat comprises a second spline sleeve matched with the spline shaft.

5. A transmission system according to claim 3, wherein: the transmission case also comprises a sliding seat control component,

the sliding seat control assembly comprises a limiting piece and a sliding control piece, the first sliding seat and the second sliding seat are slidably mounted on the limiting piece, and the steering gear is in transmission connection with the sliding control piece and is used for controlling the sliding control piece to move along the direction parallel to the speed change rotating shaft; the slide controls include a first slide control and a second slide control; when the slide control member moves in a direction parallel to the shift spindle: the first slide control is in contact with the first slide while the second slide control is separated from the second slide such that the first slide moves with the slide control; or the first carriage control is separated from the first carriage while the second carriage control is in contact with the second carriage such that the second carriage moves with the slide control.

6. A transmission system according to claim 5, wherein: the sliding control piece comprises a rack arranged in a direction parallel to the speed change rotating shaft; the steering gear is in transmission connection with the rack; the first sliding seat control part is arranged at one end, close to the first sliding seat, of the rack, and the second sliding seat control part is arranged at one end, close to the second sliding seat, of the rack.

7. A transmission system according to claim 6, wherein: the first carriage includes a first slide control for cooperating with the first carriage control, the second carriage includes a second slide control for cooperating with the second carriage control; the first and second slide controls are located between the first and second slide controls in a direction of the shift spindle.

8. A transmission system according to claim 4 or 5 or 6 or 7, wherein: the transmission case further comprises an elastic return structure, and the elastic return structure can enable the first sliding seat and the second sliding seat to be located along the direction of the variable speed rotating shaft to be away from each other.

9. A transmission system according to claim 8, wherein: the elastic return structure is a return spring sleeved on the outer surface of the variable speed rotating shaft, and the return spring is arranged between the first connecting seat and the second connecting seat.