Controllable starting transmission device and system

Abstract

The utility model provides a controllable starting transmission device and system.The controllable starting transmission device comprises a device body and a bridge type loop hydraulic system, the device body is reasonable in design and compact in structure, a driving motor can be started in a no-load mode and stably and slowly started in a load mode, the starting time is prolonged, and the acceleration torque of the load is reduced; on the basis, through the arrangement of the bridge type hydraulic loop, the input shaft of the device body rotates clockwise or anticlockwise, namely, the belt conveyor motor rotates forwards or backwards, and therefore the service performance of the conveying belt can be improved, and the service life of the conveying belt can be prolonged. And a gear pump of the bridge type loop hydraulic system can provide forward oil pressure control for a clutch piston of the device main body, so that the forward rotation and reverse rotation operation requirements of the conveyor are met under the condition that no operation is carried out on a CST main machine.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission devices, in particular to a controllable start transmission device and a system comprising the controllable start transmission device. Background Art

[0002] At present, large-capacity, long-distance, high-speed belt conveyors are widely used in the transportation of bulk materials such as coal blocks and ore. The starting and transmission devices mainly adopt the following two methods: one is composed of a motor, a torque-limited hydraulic coupling, and a reducer. Because it is affected by the torque-limited hydraulic coupling during the driving and transmission process, the starting time is short, and the belt starting cannot be accurately controlled according to the control curve requirements. There are problems such as poor starting stability and large impact. The serious consequence will cause lateral cracks in the conveyor belt, which becomes the biggest hidden danger to production safety; the other is composed of a variable frequency motor, a frequency converter and a reducer. The frequency converter has a short life, low reliability, and high environmental requirements. At the same time, the frequency converter will generate harmonic currents, which will pollute the power grid and cause other electrical equipment in the power grid to operate unstable, and the safety hazards are also very large. Utility Model Content

[0003] In view of the defects in the prior art, the purpose of the utility model is to provide a controllable starting transmission device and a system including the transmission device. On the basis of the existing mature gears and clutches, the helical gears, planetary gears, and wet clutches are innovatively combined, and the opening and closing of the clutch and the output shaft speed are controlled by the hydraulic system. The power range is large and the scope of application is wide.

[0004] In order to achieve the above-mentioned invention object, the utility model adopts the following technical solution:

[0005] According to a first aspect of the present invention, there is provided a controllable start transmission device, comprising a device body and a bridge circuit hydraulic system, wherein the device body comprises a housing, a speed change gear set arranged in the housing, a planetary gear set, an internal spline and a clutch assembly;

[0006] The speed change gear set includes a meshing main drive gear and an intermediate gear, the input shaft of the main drive gear is driven by a motor, and the intermediate gear shaft of the intermediate gear is connected to an internal spline; the planetary gear set includes an output shaft, a planetary gear carrier, a sun gear and a plurality of planetary gears, the sun gear is connected to the internal spline, and a plurality of planetary gears are evenly mounted on the planetary gear carrier and meshed with the sun gear, one end of the output shaft is connected to the planetary gear carrier, and the other end extends out of the housing;

[0007] The clutch assembly includes a clutch plate group, a gear ring, a piston chamber and a piston. The two ends of the gear ring are respectively meshed with the planetary gear and the clutch plate group. The bridge circuit hydraulic system is connected to the piston chamber. When the oil pressure in the piston chamber is zero, the clutch plate group is released, and the gear ring can rotate without load under the drive of the planetary gear. When the bridge circuit hydraulic system supplies oil to the piston chamber, the clutch plate group is closed under the pressure of the piston and provides a braking force to the gear ring to limit the rotation of the gear ring. The planetary gear carrier can then drive the output shaft to rotate under the reaction thrust of the planetary gear.

[0008] The bridge circuit hydraulic system includes a gear pump, a bridge circuit valve block and a hydraulic box. The gear pump is connected to the intermediate gear shaft through a coupling, and the intermediate gear shaft provides rotational force for the gear pump. The oil outlet of the box is connected to the gear pump through the bridge circuit valve block, and the gear pump is connected to the oil inlet of the box through the internal pipeline of the hydraulic box, and the oil inlet is connected to the piston chamber.

[0009] Preferably, a middle partition is provided in the housing, which divides the housing into a first mounting part and a second mounting part, the speed change gear set is provided in the first mounting part of the housing, and the planetary gear set, internal spline and clutch assembly are provided in the second mounting part of the housing.

[0010] Preferably, the first mounting portion of the housing is provided with a mounting cover plate, and the mounting cover plate and the middle partition plate are provided with a first bearing seat and a second bearing seat for respectively assembling the main drive gear and the intermediate gear, and the input shaft of the main drive gear is mounted on the first bearing seat through a bearing; the intermediate gear shaft of the intermediate gear is mounted on the second bearing seat through a bearing, and a spline is provided at one end of the intermediate gear shaft, and the spline passes through the middle partition plate and is connected to an internal spline arranged on the second mounting portion of the housing.

[0011] Preferably, the planetary gear set also includes star gear shafts, the number of which corresponds to the number of planetary gears, the star gear shafts are fixedly connected to the planetary gear frame and are evenly arranged on the planetary gear frame, and the planetary gears are mounted on the star gear shafts through bearings; the number of planetary gears and star gear shafts is at least three.

[0012] Preferably, the clutch assembly also includes a clutch seat and a positioning plate. A circle of grooves is provided on the outer periphery of the ring gear. The positioning plate is fixedly connected to the clutch seat by bolts. The ring gear cooperates with the positioning plate through the groove to achieve rotation relative to the positioning plate and the clutch seat and restricted axial movement.

[0013] Preferably, the clutch seat is provided with sliding external teeth, the end of the gear ring close to the clutch seat is provided with sliding internal teeth, and the other end is provided with planetary gear internal teeth, the sliding external teeth on the clutch seat and the sliding internal teeth on the gear ring are both engaged with the teeth of the clutch plate group, and the planetary gear internal teeth on the gear ring are engaged with the multiple planetary gears on the planetary gear carrier.

[0014] Preferably, the clutch seat is also provided with a sealing ring, a compression spring and an oil inlet interface, a piston cavity is formed between the sealing ring and the piston, and the compression spring is used for resetting the piston; the oil inlet interface is used to control the oil pressure in the piston cavity, and the oil inlet interface is connected to the internal pipeline of the bridge circuit hydraulic system.

[0015] Preferably, a proportional valve and a relief valve are provided on the internal pipeline. After the tank oil enters the internal pipeline of the hydraulic box, it enters the clutch assembly to control the piston after being controlled and regulated by the proportional valve and the relief valve.

[0016] A Y-type filter is arranged between the box body and the bridge circuit valve block; and a filter is also arranged between the bridge circuit valve block and the hydraulic box.

[0017] Preferably, the bridge circuit hydraulic system further comprises a temperature sensor and a speed sensor, both of which are installed at corresponding positions of the box body, the temperature sensor is used to measure the oil temperature in the box body, and the speed sensor is used to measure the rotational speed of the output shaft.

[0018] According to the second aspect of the utility model, a controllable starting transmission system is provided, comprising an electronic control box, a cooler and the controllable starting transmission device described in any one of the above items, wherein the electronic control box is used to provide control signals for controlling a proportional valve and a relief valve to a bridge circuit hydraulic system, and to read temperature sensors, speed sensors and pressure oil signals in the hydraulic system; a cooling oil chamber for cooling the clutch assembly is also provided in the box body, and the cooler is connected to the cooling oil chamber for controlling the inflow and outflow of cooling oil.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1. The controllable start transmission device provided by the utility model uses a bridge hydraulic circuit. No matter whether the input shaft rotates clockwise or counterclockwise, that is, no matter whether the belt conveyor motor rotates forward or reverse, the gear pump can provide positive oil pressure control for the clutch piston, thereby ensuring that the forward and reverse operation requirements of the conveyor are met without any operation on the CST host.

[0021] 2. The controllable starting transmission device provided by the utility model has a reasonable design and a compact structure. It can enable the driving motor to start without load and start smoothly and slowly with load, thereby extending the starting time and reducing the acceleration torque of the load, thereby improving the performance of the conveyor belt and extending its service life. At the same time, it is more conducive to the automatic control of the drive system to achieve controllable flexible speed regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0023] Figure 1 This is a simplified structural diagram of the controllable start transmission device described in Example 1 of the utility model;

[0024] Figure 2 This is a simplified structural diagram of the device body described in Example 1 of the utility model;

[0025] Figure 3 This is a structural cross-sectional view of the device body described in Example 1 of the utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the planetary gear set described in Example 1 of the utility model;

[0027] Figure 5 This is a structural cross-sectional view of the clutch assembly described in Example 1 of the utility model;

[0028] Figure 6 It is a partial structural cross-sectional view of the clutch assembly described in Example 1 of the utility model;

[0029] Figure 7 This is a structural schematic diagram of the bridge circuit hydraulic system described in Example 1 of the utility model;

[0030] Figure 8 for Figure 7 A partial enlarged view of .

[0031] The figure shows:

[0032] 1 box body 11 middle partition 12 installation cover

[0033] 2 Speed ​​gear 21 Main drive gear 211 Input shaft

[0034] 22 intermediate gear 221 intermediate gear shaft 222 spline

[0035] 3 Planetary gear set 31 Output shaft 32 Planetary gear carrier

[0036] 33 sun gear 34 planetary gear 35 star gear shaft

[0037] 4 internal spline 5 clutch assembly 51 clutch seat

[0038] 511 sliding outer tooth 512 sealing ring 513 compression spring

[0039] 52 clutch plate set 53 gear ring 531 sliding internal gear

[0040] 532 star wheel internal gear 54 piston 54 piston

[0041] 56 piston chamber 57 oil inlet interface 601 gear pump

[0042] 602 bridge circuit valve block 603 filter 604 hydraulic box

[0043] 605 first relief valve 606 proportional valve 607 second relief valve

[0044] 608-Y-type filter 700-Device body 800-Bridge loop hydraulic system

[0045] 900-Controllable start transmission device DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0048] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in the subsequent figures. In addition, all directional indications in this application (such as up, down, left, right, front, back, bottom...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. Furthermore, the descriptions involving "first", "second", etc. in the application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated.

[0049] Example 1

[0050] This embodiment provides a controllable start transmission device 900, such as Figure 1 As shown, it includes a device body 700 and a bridge circuit hydraulic system 800. Figure 2 As shown, the device body 700 generally includes a housing 1, a speed change gear set 2, a planetary gear set 3, an internal spline 4 and a clutch assembly 5. Figure 3As shown, a middle partition 11 is provided in the housing 1, and the middle partition 11 divides the housing 1 into a first mounting portion located on the left and a second mounting portion located on the right. The speed change gear set 2 is provided at the first mounting portion of the housing 1, and the planetary gear set 3, the internal spline 4 and the clutch assembly 5 are provided at the second mounting portion of the housing 1.

[0051] Specifically, with respect to the speed change gear set 2, as Figure 3 As shown, a mounting cover 12 is provided on the left side of the housing 1, and the speed change gear set 2 includes a main drive gear 21 and an intermediate gear 22. A first bearing seat for assembling the main drive gear 21 and a second bearing seat for assembling the intermediate gear 22 are provided on the mounting cover 12 and the middle partition 11. The input shaft 211 of the main drive gear 21 is mounted on the first bearing seat through a bearing, and the intermediate gear shaft 221 of the intermediate gear 22 is mounted on the second bearing seat through a bearing, and the intermediate gear 22 is meshed with the main drive gear 21.

[0052] When the controllable start transmission device 900 provided in this embodiment is in use, the input shaft 211 of the main driving gear 21 will rotate under the drive of the motor, and the main driving gear 21 will drive the intermediate gear 22 meshing therewith to rotate, and the intermediate gear 22 and the main driving gear 21 are designed with different gear ratios for speed reduction. In addition, a spline 222 is provided at one end of the intermediate gear shaft 221, and the spline 222 passes through the middle partition plate 11 and is connected to the internal spline 4 provided on the second mounting portion of the housing 1.

[0053] Further, with respect to the planetary gear set 3, if Figure 4 As shown, the planetary gear set 3 includes an output shaft 31, a planetary gear carrier 32, a sun gear 33, planetary gears 34 and a planetary gear shaft 35. In this embodiment, there are three planetary gear shafts 35, which are fixedly connected to the planetary gear carrier 32 and evenly arranged on the planetary gear carrier 32. The number of planetary gears 34 corresponds to the planetary gear shafts 35, which are installed on the planetary gear shafts 35 through bearings. The planetary gears 34 are meshed with the sun gear 33, and the internal spline 4 is connected to the sun gear 33. One end of the output shaft 31 is connected to the planetary gear carrier 32, and the other end extends out of the housing 1. The housing 1 is provided with an output shaft cover plate for protecting the output shaft 31.

[0054] Further, with respect to the clutch assembly 5, as Figure 5 As shown, the clutch assembly 5 includes a clutch seat 51, a clutch plate group 52, a gear ring 53, a piston 54 and a positioning plate 55. The clutch seat 51 is fixedly connected to the housing 1 by bolts. In addition, bearings are installed at both ends of the planetary gear carrier 32, and bearing seats are provided on the housing 1 and the clutch seat 51. The bearing at one end of the planetary gear carrier 32 is installed on the bearing seat of the housing 1, and the bearing at the other end is installed on the bearing seat of the clutch seat 51.

[0055] The ring gear 53 can rotate relative to the clutch seat 51 through the positioning plate 55 and is restricted from axial movement. Specifically, a circle of grooves 533 is provided on the outer periphery of the ring gear 53. The positioning plate 55 is fixedly connected to the clutch seat 51 by bolts. The ring gear 53 rotates relative to the positioning plate 55 and the clutch seat 51 through the cooperation of the grooves 533 and the positioning plate 55, and the structural design restricts the axial movement of the ring gear 13. The end of the ring gear 53 away from the clutch seat 51 is provided with a planetary gear internal tooth 532, which meshes with the three planetary gears 34 on the planetary gear carrier 32.

[0056] The clutch seat 51 is provided with sliding external teeth 511, and the end of the gear ring 53 close to the clutch seat 51 is provided with sliding internal teeth 531. The sliding external teeth 511 of the clutch seat 51 and the sliding internal teeth 531 of the gear ring 53 are both meshed with the teeth of the clutch plate group 52, so that when the clutch plate group 52 is closed, the gear ring 53 is difficult to rotate relative to the clutch seat 51 under the braking force of the clutch plate group 52, and when the clutch plate group 52 is released, the gear ring 53 can rotate relative to the clutch seat 51. Specifically, the clutch plate group 52 includes a driven plate and an active friction plate, the driven plate is provided with internal teeth, and the active friction plate is provided with external teeth. The sliding external teeth 511 on the clutch seat 51 are meshed with the internal teeth of the driven plate of the clutch plate group 52, and the sliding internal teeth 531 on the gear ring 53 are meshed with the external teeth of the active friction plate of the clutch plate group 52.

[0057] In addition, if Figure 6 As shown, a group of sealing rings 512 and compression springs 513 are also provided on the clutch seat 51. A piston cavity 56 is formed between the sealing ring 512 and the piston 54. The compression spring 513 is used to reset the piston 54. An oil inlet interface 57 for controlling the oil pressure in the piston cavity 56 is also provided on the clutch seat 51. The oil inlet interface 57 is communicated with the bridge circuit hydraulic system 800. The bridge circuit hydraulic system 800 is communicated with the piston cavity 56 through the oil inlet interface 57.

[0058] Furthermore, as for the bridge circuit hydraulic system 800, it is generally arranged on the side of the box body 1 and communicated with the oil inlet and the oil outlet arranged on the box body 1. The oil in the box body 1 is delivered to the bridge circuit hydraulic system 800 through the oil outlet, and the bridge circuit hydraulic system 800 supplies oil to the box body 1 through the oil inlet, thereby realizing the recycling of the box body oil. Specifically, Figure 1 , Figure 7 and Figure 8As shown, the bridge circuit hydraulic system 800 includes a gear pump 601, a bridge circuit valve block 602 containing four check valves, a filter 603, a hydraulic box 604, a first relief valve 605, a proportional valve 606, a second relief valve 607 and a Y-type filter 608. The gear pump 601 is connected to the intermediate gear shaft 211 through a coupling so that the intermediate gear shaft 211 provides it with speed power, and the second relief valve 607 plays a safety protection role. When the motor of the belt conveyor rotates forward or reverse, the gear pump 601 will also change direction driven by the intermediate gear shaft 211, and the following two working conditions will occur at this time:

[0059] First, when the P1 port of the gear pump 601 is for oil discharge and the P2 port is for oil suction, the tank oil flows into the bridge circuit valve block 602 through the Y-type filter 608, and enters the gear pump 601 along the B1 port, the check valve RCV5, and the A1 port, and then enters the filter 603 through the P1 port, the A2 port, the check valve CV4, and the B2 port;

[0060] Second, when the P1 port of the gear pump 601 is for oil suction and the P2 port is for oil discharge, the tank oil flows into the bridge circuit valve block 602 through the Y-type filter 608, and enters the gear pump 601 along the B1 port, the one-way valve RCV4, and the A2 port, and then enters the filter 603 through the P2 port, the A1 port, the one-way valve CV5, and the B2 port.

[0061] The lubricating oil in the box 1 under the above two working conditions can enter the filter 603, and then enter the internal pipeline of the hydraulic box 604, and enter the clutch control piston 54 after being controlled and regulated by the proportional valve 606 and the first relief valve 605. In this way, no matter whether the input shaft 211 rotates clockwise or counterclockwise, that is, the belt conveyor motor rotates forward or reverse, the gear pump 601 can provide positive oil pressure control for the clutch piston 54, thereby ensuring that the forward and reverse operation requirements of the conveyor are met without any operation on the CST main machine.

[0062] In addition, the bridge circuit hydraulic system 800 also includes a temperature sensor and a speed sensor. The temperature sensor is installed on the box body 1 to measure the oil temperature in the box body 1; the speed sensor is installed on the output shaft cover plate of the box body 1 to measure the rotation speed of the output shaft 31.

[0063] The controllable start transmission device provided in this embodiment will be used in conjunction with other equipment such as an electric control box when it is actually used. For example, before the belt is started, under the control signal of the electric control box, the oil pressure output by the bridge circuit hydraulic system 800 is zero, and there is no pressure in the piston chamber 56. Due to the action of the compression spring 513, the piston 54 is pulled toward the clutch seat 51 to release the clutch plate group 52, and the ring gear 53 can rotate at this time. Start the main motor, the input shaft 211 of the main drive gear 21 rotates at full speed under the drive of the motor, thereby driving the intermediate gear shaft 221 of the intermediate gear 22 to rotate, and the intermediate gear shaft 221 drives the sun gear 33 to rotate through the internal spline 4, and the sun gear 33 further drives the planetary gear 34 to rotate, and the planetary gear 34 further drives the ring gear 53. Since the clutch plate group 52 is in a released state at this time, the ring gear 53 rotates without load, so the output shaft 31 of the planetary gear set 3 is under load, and the planetary gear carrier 32 is stationary and does not rotate.

[0064] When the belt is started, under the control signal of the electronic control box, the oil pressure output by the bridge circuit hydraulic system 800 is gradually loaded from zero to the maximum, the oil pressure in the piston chamber 56 gradually increases, and the piston 54 is pushed toward the clutch plate group 52 under the pressure of the hydraulic oil, so that the clutch plate group 52 is gradually closed, which makes the ring gear 53 gradually stop rotating under the braking force of the clutch, and the planetary gear carrier 32 gradually rotates under the reaction thrust of the planetary gear 34; at this time, the electronic control box continuously collects the speed signal, controls the time and speed of the increase of the output oil pressure of the hydraulic system, and controls the rotation acceleration of the planetary gear carrier 32, so that the output shaft 31 reaches the full output speed under a controllable state, and controls the belt starting time.

[0065] The controllable starting transmission device 900 provided in this embodiment can controllably provide starting torque, start smoothly and slowly, extend the starting time, reduce the acceleration torque of the load, improve the performance of the conveyor belt and extend its service life; and its structural design is reasonable, the structure is tight and compact, the power range is large, the practicality is strong, the application range is wide, and it has good development prospects. On this basis, this embodiment sets a bridge hydraulic circuit so that no matter whether the belt conveyor motor is forward or reverse, the gear pump of the bridge circuit hydraulic system can provide positive oil pressure control for the clutch piston, thereby ensuring that the forward and reverse operation requirements of the conveyor are met without any operation on the CST host.

[0066] Example 2

[0067] This embodiment provides a controllable starting transmission system, including an electronic control box, a cooler and the controllable starting transmission device described in Example 1. The electronic control box is used to provide control signals for controlling the proportional valve 606 and the overflow valve 605 to the bridge circuit hydraulic system 800, and read the temperature sensor, speed sensor and pressure oil signals in the hydraulic system; a cooling oil chamber for cooling the clutch assembly 5 is also provided in the box body 1, and the cooler is connected to the cooling oil chamber to control the inlet and outlet of the cooling oil.

[0068] The specific embodiments of the present invention are described above. Through the above description, relevant staff can make various changes and modifications without departing from the technical concept of the present invention.

Claims

1. A controllable start transmission device, characterized in that: The invention comprises a device body (700) and a bridge circuit hydraulic system (800), wherein the device body (700) comprises a housing (1), a speed change gear set (2) arranged in the housing (1), a planetary gear set (3), an internal spline (4) and a clutch assembly (5); The speed change gear set (2) comprises a meshing main drive gear (21) and an intermediate gear (22), the input shaft (211) of the main drive gear (21) being driven by a motor, and the intermediate gear shaft (221) of the intermediate gear (22) being connected to an internal spline (4); the planetary gear set (3) comprises an output shaft (31), a planetary gear carrier (32), a sun gear (33) and a plurality of planetary gears (34), the sun gear (33) being connected to the internal spline (4), the plurality of planetary gears (34) being evenly mounted on the planetary gear carrier (32) and meshing with the sun gear (33), one end of the output shaft (31) being connected to the planetary gear carrier (32), and the other end extending out of the housing (1); The clutch assembly (5) comprises a clutch plate group (52), a ring gear (53), a piston chamber (56) and a piston (54); two ends of the ring gear (53) are respectively meshed with the planetary gear (34) and the clutch plate group (52); the bridge circuit hydraulic system (800) is connected to the piston chamber (56); when the oil pressure in the piston chamber (56) is zero, the clutch plate group (52) is released, and the ring gear (53) can rotate without load under the drive of the planetary gear (34); when the bridge circuit hydraulic system (800) supplies oil to the piston chamber (56), the clutch plate group (52) is closed under the pressure of the piston (54) and provides a braking force to the ring gear (53) to limit the rotation of the ring gear (53); the planetary gear carrier (32) can then drive the output shaft (31) to rotate under the reaction thrust of the planetary gear (34); The bridge circuit hydraulic system (800) comprises a gear pump (601), a bridge circuit valve block (602) and a hydraulic box (604); the gear pump (601) is connected to an intermediate gear shaft (221) via a coupling, and the intermediate gear shaft (221) provides rotational force for the gear pump (601); the oil outlet of the box body (1) is connected to the gear pump (601) via the bridge circuit valve block (602); the gear pump (601) is connected to the oil inlet of the box body (1) via an internal pipeline of the hydraulic box (604), and the oil inlet is connected to the piston chamber (56).

2. The controllable start transmission device according to claim 1, characterized in that: A middle partition (11) is arranged in the housing (1), and the middle partition (11) divides the housing (1) into a first mounting portion and a second mounting portion. The speed change gear set (2) is arranged on the first mounting portion of the housing (1), and the planetary gear set (3), the internal spline (4) and the clutch assembly (5) are arranged on the second mounting portion of the housing (1).

3. The controllable start transmission device according to claim 2, characterized in that: The first mounting portion of the housing (1) is provided with a mounting cover plate (12), and the mounting cover plate (12) and the middle partition plate (11) are both provided with a first bearing seat and a second bearing seat for respectively assembling a main drive gear (21) and an intermediate gear (22), the input shaft (211) of the main drive gear (21) being mounted on the first bearing seat via a bearing; the intermediate gear shaft (221) of the intermediate gear (22) is mounted on the second bearing seat via a bearing, and a spline (222) is provided at one end of the intermediate gear shaft (221), and the spline (222) passes through the middle partition plate (11) and is connected to an internal spline (4) provided on the second mounting portion of the housing (1).

4. The controllable start transmission device according to claim 1, characterized in that: The planetary gear set (3) further comprises planetary gear shafts (35), the number of the planetary gear shafts (35) corresponding to the number of the planetary gears (34), the planetary gear shafts (35) being fixedly connected to the planetary gear carrier (32) and evenly arranged on the planetary gear carrier (32), and the planetary gears (34) being mounted on the planetary gear shafts (35) via bearings; and the number of the planetary gears (34) and the planetary gear shafts (35) is at least three.

5. The controllable start transmission device according to claim 1, characterized in that: The clutch assembly (5) further comprises a clutch seat (51) and a positioning plate (55); a circle of grooves (533) are arranged on the outer periphery of the gear ring (53); the positioning plate (55) is fixedly connected to the clutch seat (51) by bolts; the gear ring (53) cooperates with the positioning plate (55) through the grooves (533) to achieve rotation relative to the positioning plate (55) and the clutch seat (51) and restricted axial movement.

6. The controllable start transmission device according to claim 5, characterized in that: The clutch seat (51) is provided with sliding external teeth (511); one end of the gear ring (53) close to the clutch seat (51) is provided with sliding internal teeth (531); the other end is provided with star wheel internal teeth (532); the sliding external teeth (511) on the clutch seat (51) and the sliding internal teeth (531) on the gear ring (53) are both meshed with teeth of the clutch plate group (52); the star wheel internal teeth (532) on the gear ring (53) are meshed with a plurality of planetary gears (34) on the planetary gear carrier (32).

7. The controllable start transmission device according to claim 5, characterized in that: The clutch seat (51) is also provided with a sealing ring (512), a compression spring (513) and an oil inlet interface (57); a piston chamber (56) is formed between the sealing ring (512) and the piston (54); the compression spring (513) is used for resetting the piston (54); the oil inlet interface (57) is used for controlling the oil pressure in the piston chamber (56); the oil inlet interface (57) is connected to an internal pipeline of the bridge circuit hydraulic system.

8. The controllable start transmission device according to claim 1, characterized in that: The internal pipeline is provided with a proportional valve (606) and a relief valve (605). After the tank oil enters the internal pipeline of the hydraulic box (604), it enters the clutch assembly (5) after being controlled and regulated by the proportional valve (606) and the relief valve (605) to control the piston (54). A Y-type filter (608) is provided between the box body (1) and the bridge circuit valve block (602); and a filter (603) is also provided between the bridge circuit valve block (602) and the hydraulic box (604).

9. The controllable start transmission device according to claim 1, characterized in that: The bridge circuit hydraulic system further comprises a temperature sensor and a speed sensor, both of which are mounted at corresponding positions of the box (1), the temperature sensor being used to measure the oil temperature in the box (1), and the speed sensor being used to measure the rotational speed of the output shaft (31).

10. A controllable start transmission system, characterized in that: It comprises an electric control box, a cooler and a controllable starting transmission device as claimed in any one of claims 1 to 9, wherein the electric control box is used to provide control signals for controlling a proportional valve (606) and a relief valve (605) to a bridge circuit hydraulic system, and read the temperature sensor, the speed sensor and the pressure oil signal in the hydraulic system; the box body (1) is also provided with a cooling oil chamber for cooling the clutch assembly (5), and the cooler is connected to the cooling oil chamber for controlling the inflow and outflow of cooling oil.

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