阅读说明：本技术 变速行走齿轮箱及行走减速机 (Variable speed walking gear box and walking speed reducer ) 是由 李荃 *** 王德申 李苏东 蔡志明 于 2019-10-30 设计创作，主要内容包括：本申请公开了一种变速行走齿轮箱及行走减速机,涉及齿轮箱的技术领域,以解决现有技术中的无法变速的技术问题。本申请的变速行走齿轮箱包括箱壳、第一输入轴、第二输入轴、第三中间轴、输出结构和变速结构；第一输入轴上固定连接有第一左齿轮和第一右齿轮；第二输入轴上固定连接有第二左齿轮和第二右齿轮；第三中间轴上套设有均能绕中间轴转动的第三左齿轮和第三右齿轮,其中,第三左齿轮与第一左齿轮和第二左齿轮同时啮合,第三右齿轮与第一右齿轮和第二右齿轮同时啮合；输出结构与第三中间轴传动连接；变速结构设于第三中间轴上,并能与第三左齿轮和第三右齿轮传动连接,用于通过第三左齿轮或第三右齿轮驱动第三中间轴转动。(The application discloses variable speed walking gear box and walking speed reducer relates to the technical field of gear boxes to solve the technical problem of unable variable speed among the prior art. The variable-speed walking gearbox comprises a box shell, a first input shaft, a second input shaft, a third intermediate shaft, an output structure and a variable-speed structure; the first input shaft is fixedly connected with a first left gear and a first right gear; a second left gear and a second right gear are fixedly connected to the second input shaft; a third left gear and a third right gear which can rotate around the intermediate shaft are sleeved on the third intermediate shaft, wherein the third left gear is meshed with the first left gear and the second left gear simultaneously, and the third right gear is meshed with the first right gear and the second right gear simultaneously; the output structure is in transmission connection with the third intermediate shaft; the speed change structure is arranged on the third intermediate shaft, can be in transmission connection with the third left gear and the third right gear and is used for driving the third intermediate shaft to rotate through the third left gear or the third right gear.)

1. A variable speed walk gearbox, comprising:

a cabinet housing;

the first input shaft is arranged in the box shell and used for connecting the first left gear and the first right gear;

the second input shaft is arranged in the box shell and used for connecting the second left gear and the second right gear;

the third intermediate shaft is arranged in the box shell and used for connecting a third left gear and a third right gear; and

the speed change structure is arranged on the third intermediate shaft and can be in transmission connection with the third left gear and the third right gear;

wherein the third left gear meshes with the first left gear and the second left gear simultaneously, and the third right gear meshes with the first right gear and the second right gear simultaneously; the speed change structure is used for driving the third intermediate shaft to rotate through the third left gear or the third right gear.

2. The variable speed travel gearbox of claim 1, wherein the third left gear and the third right gear are spaced apart and gapped, the variable speed structure comprising:

third middle external teeth arranged on the outer side wall of the third middle shaft and positioned in the gap;

the inner wall of the gear shifting gear sleeve is provided with gear shifting inner teeth; and

the gear sleeve moving mechanism is in transmission connection with the gear shifting gear sleeve and is used for driving the gear shifting gear sleeve to move;

wherein the shift inner teeth are simultaneously engageable with the third intermediate outer teeth and the third left gear after the shift sleeve has moved to a first preset position;

after the gear shifting sleeve moves to the second preset position, the gear shifting inner teeth can be meshed with the third middle outer teeth and the third right gear simultaneously.

3. Variable speed walking gearbox according to claim 2,

the third left gear comprises a first left gear and a second left gear which are coaxially arranged, and the first left gear is meshed with the first left gear and the second left gear simultaneously; the second left gear is used for meshing with the shifting internal teeth;

the third right gear comprises a first right gear and a second right gear which are coaxially arranged, and the first right gear is meshed with the first right gear and the second right gear simultaneously; the second right gear is used for meshing with the shifting internal teeth.

4. The variable speed walking gearbox according to claim 3, wherein the gear shifting sleeve is a circular ring structure, and a limiting groove is arranged on the end surface of the gear shifting sleeve;

the gear sleeve moving mechanism comprises:

the gear shifting handle is arranged on the outer side of the box shell;

one end of the transmission rod is connected with the gear shifting handle, and the other end of the transmission rod can be rotatably arranged in the box shell in a penetrating manner; and

one end of the rocker arm is connected to the transmission rod, and a moving piece is arranged at one end of the rocker arm and is arranged in the limiting groove;

when the rocker arm rotates by a preset angle, the moving element can move for a preset distance along the axis direction of the third intermediate shaft, and the gear shifting gear sleeve moves for a preset distance.

5. The variable speed traveling gearbox according to claim 4, wherein the rocker arm is provided with a mounting hole, the moving member is provided in the mounting hole through a bearing bush, and the moving member is capable of rotating around its axis.

6. The variable speed walking gearbox according to claim 4, wherein the limiting groove is an annular groove, the number of the rocker arms is two, the rocker arms are respectively positioned at two sides of the gear shifting sleeve, and correspondingly, the number of the moving members is two.

7. The variable speed walking gearbox of any one of claims 1 to 6, wherein the variable speed walking gearbox comprises an output structure in driving connection with the third intermediate shaft;

the output structure includes:

an output shaft connected to the third intermediate shaft;

the output gear ring is rotatably arranged outside the box shell;

the sun wheel set is sleeved on the output shaft;

the sun gear set is in transmission connection with the output gear ring through the planetary gear set; and

the planetary gear set can be rotatably arranged on the planetary rotating frame.

8. The variable speed travel gearbox of claim 7, wherein the sun set comprises a secondary sun gear, a tertiary sun gear, and a quaternary sun gear;

the planetary gear set includes:

a secondary planet gear simultaneously meshed with the secondary sun gear and the output ring gear;

a third planetary gear meshed with the third sun gear and the output ring gear simultaneously; and

a fourth stage planet gear simultaneously meshing with the fourth stage sun gear and the output ring gear.

9. The variable speed travel gearbox of claim 8, wherein the planetary gearset comprises:

the secondary planet rotating frame is arranged on the tertiary sun gear, and the secondary planet gear can be rotatably arranged on the secondary planet rotating frame through a secondary bearing;

the third-stage planetary rotating frame is arranged on the fourth-stage sun gear, and the third-stage planetary gear can be rotatably arranged on the third-stage planetary rotating frame through a third-stage bearing; and

the four-stage planetary rotating frame is arranged on the box shell, and the four-stage planetary gear can be rotatably arranged on the four-stage planetary rotating frame through a four-stage bearing.

10. A walking speed reducer, comprising:

a first power member;

a second power member;

a variable speed walking gearbox according to any one of claims 1 to 9; and

the first power part and the second power part are in transmission connection with the crawler through the variable speed walking gear box.

Technical Field

The application relates to the technical field of gear boxes, in particular to a variable speed walking gear box and a walking speed reducer.

Background

The walking speed reducer is widely used for equipment such as excavators, rotary drilling rigs, crawler cranes and the like, is a key transmission part of engineering machinery, and is mainly used for driving a crawler, so that the functions of advancing, retreating, steering and the like of the engineering machinery are realized. In order to realize heavy-load work, large output torque is needed, a large-displacement motor can be configured, and two small-displacement motors can be used for inputting simultaneously. Moreover, two small-displacement motors are adopted for simultaneous input, so that the cost can be effectively reduced, the product competitiveness can be improved, and the output torque effect close to that of a large-displacement motor can be realized.

However, in the prior art, the walking speed reducer with two small-displacement motors input simultaneously is adopted, and the speed ratio of the gear box is constant, so that the speed cannot be changed.

The traveling speed reducer which can not change speed in the prior art has the defects of low driving speed and long short-distance transition waiting time, although the output torque is high, the output rotating speed is low if the traveling speed reducer adopts a large speed ratio; if a small speed ratio is adopted, the output rotation speed is high, but the output torque is low, and the load operation of the traveling speed reducer is difficult.

Disclosure of Invention

The application aims to provide a variable-speed walking gearbox to solve the technical problem that speed cannot be changed in the prior art.

The application also aims to provide a walking speed reducer to solve the technical problem that speed cannot be changed in the prior art.

The above technical problem of the present application is mainly solved by the following technical solutions:

a variable-speed walking gearbox comprises a gearbox shell, a first input shaft, a second input shaft, a third intermediate shaft, an output structure and a variable-speed structure; the first input shaft is arranged in the box shell, and a first left gear and a first right gear are fixedly connected to the first input shaft; the second input shaft is arranged in the box shell, and a second left gear and a second right gear are fixedly connected to the second input shaft; the third intermediate shaft is arranged in the box shell, and a third left gear and a third right gear which can rotate around the intermediate shaft are sleeved on the third intermediate shaft, wherein the third left gear is meshed with the first left gear and the second left gear simultaneously, and the third right gear is meshed with the first right gear and the second right gear simultaneously; the output structure is in transmission connection with the third intermediate shaft; the speed change structure is arranged on the third intermediate shaft, can be in transmission connection with the third left gear and the third right gear, and is used for driving the third intermediate shaft to rotate through the third left gear or the third right gear.

In one embodiment, the third left gear and the third right gear are arranged at left and right intervals with a gap, the speed change structure includes third middle external teeth, a gear shift sleeve and a sleeve gear moving mechanism, and the third middle external teeth are arranged on the outer side wall of the third intermediate shaft and are located in the gap; the inner wall of the gear shifting gear sleeve is provided with gear shifting inner teeth; the gear sleeve moving mechanism is in transmission connection with the gear shifting gear sleeve and is used for driving the gear shifting gear sleeve to move; wherein the shift inner teeth are simultaneously engageable with the third intermediate outer teeth and the third left gear after the shift sleeve has moved to a first preset position; after the gear shifting sleeve moves to the second preset position, the gear shifting inner teeth can be meshed with the third middle outer teeth and the third right gear simultaneously.

In one embodiment, the third left gear comprises a first left gear and a second left gear which are coaxially arranged, and the first left gear is meshed with the first left gear and the second left gear simultaneously; the second left gear is used for meshing with the gear shifting internal teeth.

In one embodiment, the third right gear comprises a first right gear and a second right gear which are coaxially arranged, and the first right gear is meshed with the first right gear and the second right gear simultaneously; the second right gear is used for meshing with the shifting internal teeth.

In one embodiment, the gear shifting sleeve is of a circular ring structure, and a limiting groove is arranged on the end surface of the gear shifting sleeve; the gear sleeve moving mechanism comprises a gear shifting handle, a transmission rod and a rocker arm, and the gear shifting handle is arranged on the outer side of the box shell; one end of the transmission rod is connected with the gear shifting handle, and the other end of the transmission rod can be rotatably arranged in the box shell in a penetrating way; one end of the rocker arm is connected to the transmission rod, and a moving piece is arranged at one end of the rocker arm and is arranged in the limiting groove; when the rocker arm rotates by a preset angle, the moving element can move for a preset distance along the axis direction of the third intermediate shaft, and the gear shifting gear sleeve moves for a preset distance.

In one embodiment, the rocker arm is provided with a mounting hole, the moving member is arranged in the mounting hole through a bearing bush, and the moving member can rotate around the axis of the moving member.

In an embodiment, spacing recess is the annular groove, the rocking arm is equipped with two, and is located respectively the both sides of the tooth cover of shifting, correspondingly, the moving member is equipped with two.

In one embodiment, the variable speed travel gearbox comprises an output structure in driving connection with the third intermediate shaft; the output structure comprises an output shaft, an output gear ring, a sun gear set, a planetary gear set and a planetary rotating frame set, and the output shaft is connected with the third intermediate shaft; the output gear ring is rotatably arranged on the outer side of the box shell; the sun wheel set is sleeved on the output shaft and is in transmission connection with the output gear ring through the planetary gear set; the planetary gear set can be rotatably arranged on the planetary rotating frame.

In one embodiment, the sun gear set includes a secondary sun gear, a tertiary sun gear, and a quaternary sun gear; the planetary gear set comprises a secondary planet gear, a tertiary planet gear and a quaternary planet gear, and the secondary planet gear is meshed with the secondary sun gear and the output ring gear simultaneously; the third-stage planetary gear is meshed with the third-stage sun gear and the output gear ring simultaneously; the fourth stage planetary gear is meshed with the fourth stage sun gear and the output ring gear simultaneously.

In one embodiment, the planetary turret set comprises a secondary planetary turret, a tertiary planetary turret and a quaternary planetary turret, the secondary planetary turret is arranged on the tertiary sun gear, and the secondary planetary gear is rotatably arranged on the secondary planetary turret through a secondary bearing; the third-stage planetary rotating frame is arranged on the fourth-stage sun gear, and the third-stage planetary gear can be rotatably arranged on the third-stage planetary rotating frame through a third-stage bearing; the four-stage planetary rotating frame is arranged on the box shell, and the four-stage planetary gear can be rotatably arranged on the four-stage planetary rotating frame through a four-stage bearing.

A walking speed reducer comprises a variable speed walking gear box, a first power part, a second power part and a crawler belt, wherein the variable speed walking gear box is the variable speed walking gear box; the first power part and the second power part are in transmission connection with the crawler through the variable speed walking gear box.

Compared with the prior art, the beneficial effect of this application is: the third intermediate shaft is driven to rotate by the third left gear or the third intermediate shaft is driven to rotate by the third right gear through a speed change structure, so that the speed ratio can be adjusted according to requirements, the speed change effect is achieved, and high-torque and low-speed configuration or low-torque and high-speed configuration is selected on the premise that an input motor is not replaced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a partial schematic structural view of a variable speed drive gearbox according to an embodiment of the present application;

FIG. 2 is an enlarged view of portion A of FIG. 1 of the present application when the shift sleeve is in a first predetermined position;

FIG. 3 is an enlarged view of portion A of FIG. 1 of the present application when the shift sleeve is in a second predetermined position;

FIG. 4 is a partial schematic structural view of a variable speed drive gearbox according to an embodiment of the present application;

FIG. 5 is a schematic structural view of a variable speed travel gearbox according to an embodiment of the present application;

FIG. 6 is a schematic structural view of a variable speed travel gearbox according to an embodiment of the present application;

fig. 7 is a schematic structural view of a variable speed traveling gearbox according to an embodiment of the present application.

Icon: 100-variable speed walking gear box; 1-a box shell; 11-left box shell; 12-a middle box shell; 13-right box shell; 14-a first bolt; 15-a mounting seat; 151-second hole; 16-a first hole; 17-a fourth bearing; 2-a first input shaft; 21-a first bearing; 22-a first left gear; 23-a first right gear; 3-a second input shaft; 31-a second bearing; 32-a second left gear; 33-a second right gear; 4-a third intermediate shaft; 41-a third bearing; 42-third left gear; 421-left gear; 422-left gear number two; 43-third right gear; 431-a right gear; 432-right gear No. two; 44-gap; 45-a third left bearing; 46-a third right bearing; 5-an output structure; 51-spline housing; 52-an output shaft; 53-output ring gear; 531-bearing seat; 532-a first gear ring; 533-second ring gear; 534-second bolt; 535-ring gear bearing; 54-the sun gear set; 541-a secondary sun gear; 542-third-stage sun gear; 543-four-stage sun gear; 55-a planetary gear set; 551-secondary planet gear; 552-three-stage planetary gears; 553-a four-stage planetary gear; 56-planetary turret group; 561-secondary planet carrier; 562-three-stage planetary rotating stand; 563-four stage planetary turret; 57-secondary bearings; 58-three-stage bearing; 59-four stage bearings; 6-a speed change structure; 61-third middle outer tooth; 62-a shifting sleeve; 621-internal gear shifting teeth; 622-limit groove; 63-a gear sleeve moving mechanism; 631-a gear shift handle; 632-a transmission rod; 633-rocker arm; 634-a mounting hole; 635-bearing bush; 636-moving member.

Detailed Description

The terms "first," "second," "third," and the like are used for descriptive purposes only and not for purposes of indicating or implying relative importance, and do not denote any order or order.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should be noted that the terms "inside", "outside", "left", "right", "upper", "lower", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally arranged when products of the application are used, and are used only for convenience in describing the application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application.

In the description of the present application, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.

The technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings.

The walking speed reducer comprises a variable-speed walking gearbox 100, a first power part, a second power part and a crawler belt, wherein the first power part and the second power part can be motors and are used for providing power; the first and second power members are drivingly connected to the track through a variable speed travel gearbox 100. The walking speed reducer adopts the power confluence design of two motors which input simultaneously, and can effectively improve input and output torque.

Referring to fig. 1, a partial structural schematic diagram of a variable speed traveling gearbox 100 according to an embodiment of the present application is shown. The variable speed walking gearbox 100 comprises a box shell 1, a first input shaft 2, a second input shaft 3, a third intermediate shaft 4, an output structure 5 and a speed change structure 6.

The first input shaft 2 is arranged on the box shell 1 through a first bearing 21, is used for being in transmission connection with a first power part and can rotate around the axis of the first input shaft under the driving of the first power part; the second input shaft 3 is arranged on the box shell 1 through a second bearing 31, is used for being in transmission connection with a second power part and can rotate around the axis of the second input shaft under the driving of the second power part; the third intermediate shaft 4 is mounted on the box shell 1 through a third bearing 41, is used for being in transmission connection with a third power element, and can rotate around the axis of the third intermediate shaft under the driving of the third power element. A third intermediate shaft 4 is provided between the first input shaft 2 and the second input shaft 3.

In one embodiment, the first bearing 21 includes two identical bearings, which are respectively installed at two ends of the first input shaft 2; the second bearing 31 includes two identical bearings, which are respectively installed at both ends of the second input shaft 3; the third bearing 41 includes two different bearings, which are respectively installed at both ends of the third intermediate shaft 4.

A first left gear 22 and a first right gear 23 are fixedly connected to the first input shaft 2 through key connection and the like; a second left gear 32 and a second right gear 33 are fixedly connected to the second input shaft 3; the third countershaft 4 is sleeved with a third left gear 42 and a third right gear 43 which can rotate around the countershaft.

The third left gear 42 is mounted on the third intermediate shaft 4 by a third left bearing 45, and the third right gear 43 is mounted on the third intermediate shaft 4 by a third right bearing 46. In one embodiment, the third left gear 42 and the third right gear 43 are both steel gears and are machined to form dual-teeth.

The third left gear 42 meshes with the first left gear 22 and the second left gear 32 simultaneously, and the third right gear 43 meshes with the first right gear 23 and the second right gear 33 simultaneously; the output structure 5 is in transmission connection with the third intermediate shaft 4 and is used for being in transmission connection with the crawler; the speed change mechanism 6 is disposed on the third intermediate shaft 4 and can be in transmission connection with the third left gear 42 and the third right gear 43, so as to drive the third intermediate shaft 4 to rotate through the third left gear 42 or the third right gear 43.

The gear ratio when the third left gear 42 drives the third intermediate shaft 4 to rotate is different from the gear ratio when the third right gear 43 drives the third intermediate shaft 4 to rotate.

In an operation process, it can be determined through the speed change structure 6 whether to drive the third intermediate shaft 4 to rotate through the third left gear 42 or to drive the third intermediate shaft 4 to rotate through the third right gear 43, so that the speed ratio can be adjusted according to requirements to achieve a speed change effect, and therefore, on the premise of not replacing an input motor, a high-torque and low-speed configuration or a low-torque and high-speed configuration can be selected.

Please refer to fig. 2, which is an enlarged view of a portion a of fig. 1 of the present application when the shift sleeve 62 is located at the first predetermined position. Please refer to fig. 3, which is an enlarged view of a portion a of fig. 1 of the present application when the shift sleeve 62 is located at the second predetermined position. Wherein the axial direction of the third counter shaft 4 is defined as the left-right direction, and the third left gear 42 is located on the left side of the third right gear 43; a vertical line between the axis of the first input shaft 2 and the axis of the second input shaft 3 is defined as an up-down direction, and the first input shaft 2 is located above the third intermediate shaft 4 and the second input shaft 3.

The third left gear 42 and the third right gear 43 are arranged at a left-right interval with a gap 44 left, the speed change structure 6 includes third middle external teeth 61, a gear shift sleeve 62 and a sleeve gear moving mechanism 63, the third middle external teeth 61 are arranged on the outer side wall of the third intermediate shaft 4 and are positioned in the gap 44; the inner wall of the gear shifting gear sleeve 62 is provided with gear shifting inner teeth 621; the gear sleeve moving mechanism 63 is in transmission connection with the gear shifting gear sleeve 62 and is used for driving the gear shifting gear sleeve 62 to move left and right.

When the shift sleeve 62 moves leftward to the first predetermined position (see fig. 2), the shift inner teeth 621 of the shift sleeve 62 can be engaged with the third middle outer teeth 61 and the third left gear 42 simultaneously. When the shift sleeve 62 moves rightward to the second preset position (see fig. 3), the shift inner teeth 621 of the shift sleeve 62 can simultaneously mesh with the third intermediate outer teeth 61 and the third right gear 43. In one embodiment, the first predetermined position is located on the left side of the second predetermined position.

The third left gear 42 comprises a first left gear 421 and a second left gear 422 which are coaxially arranged, and the first left gear 421 and the second left gear 422 can synchronously rotate, wherein the first left gear 421 is simultaneously meshed with the first left gear 22 and the second left gear 32; the second left gear 422 is for meshing with the shift inner teeth 621. In one embodiment, the third left gear 42 is a duplicate gear, i.e. the first left gear 421 and the second left gear 422 are integrated. The first left gear 421 and the second left gear 422 may be of a split structure or may be integrally formed. The pitch circle diameter of the first left gearwheel 421 is larger than the pitch circle diameter of the second left gearwheel 422.

The third right gear 43 includes a first right gear 431 and a second right gear 432 coaxially disposed, and the first right gear 431 and the second right gear 432 may be rotated in synchronization, wherein the first right gear 431 is simultaneously engaged with the first right gear 23 and the second right gear 33; the second right gear 432 is for meshing with the shift inner teeth 621. In one embodiment, the third right gear 43 is a duplicate gear, i.e., the first right gear 431 and the second right gear 432 are integrated. The first right gear 431 and the second right gear 432 may be of a split structure or may be integrally formed. The pitch circle diameter of the first right gear 431 is larger than that of the second right gear 432.

The first left gearwheel 421 is positioned on the left side of the second left gearwheel 422, the first right gearwheel 431 and the second right gearwheel 432 are positioned on the right side of the second right gearwheel 432, and the second left gearwheel 422 and the second right gearwheel 432 are adjacent to each other to form a gap 44.

Wherein, the transmission ratio among the first left gear 421, the first left gear 22 and the second left gear 32 is different from the transmission ratio among the first right gear 431, the first right gear 23 and the second right gear 33.

In one embodiment, the reference circle diameters of the first left gear 421 and the first right gear 431 are different, and the number of teeth is equal or different. The reference circle diameter and the number of teeth of the second left gear 422 and the second right gear 432 are equal.

In one embodiment, the first left gear 421 is a large gear, and the first left gear 22 and the second left gear 32 are small gears, wherein the pitch circle diameters of the first left gear 22 and the second left gear 32 are equal, and the pitch circle diameter of the first left gear 421 is larger than the pitch circle diameters of the first left gear 22 and the second left gear 32.

The first right gear 431 is a large gear, the first right gear 23 and the second right gear 33 are small gears, the reference circle diameters of the first right gear 23 and the second right gear 33 are equal, and the reference circle diameter of the first right gear 431 is larger than the reference circle diameters of the first right gear 23 and the second right gear 33.

When the pitch circle diameter of the first left gear 421 is N1 times the pitch circle diameter of the first left gear 22 and the pitch circle diameter of the first right gear 431 is N2 times the pitch circle diameter of the first right gear 23, N1 is not equal to N2, for example: n1 is greater than N2.

In an operation process, after the gear shift sleeve 62 moves to the left to the first preset position (please refer to fig. 2), the first power member and the second power member respectively drive the first input shaft 2 and the second input shaft 3 to rotate, and at this time, the first input shaft 2 drives the first left gear 22 and the first right gear 23 thereon to rotate; the second input shaft 3 drives the second left gear 32 and the second right gear 33 thereon to rotate; the first left gear 22 and the second left gear 32 drive the third left gear 42 to rotate, and the first right gear 23 and the second right gear 33 drive the third right gear 43 to rotate; furthermore, the second left gear 422 of the third left gear 42 drives the shifting inner teeth 621 of the shifting sleeve gear 62 to rotate; the internal gear 621 of the gear shift sleeve 62 drives the third intermediate external gear 61 to rotate, so as to drive the third intermediate shaft 4 to rotate, and the third right gear 43 does not drive the third intermediate shaft 4 to rotate due to the third right bearing 46, so that the operating speed ratio of the variable speed traveling gear box 100 is the transmission ratio of the first left gear 22, the second left gear 32, the third left gear 42, the gear shift internal gear 621 and the third intermediate external gear 61 in this state. In one embodiment, the gearbox in this state is configured for a larger speed ratio.

When the shifting sleeve gear 62 moves to the right to the second preset position (see fig. 3), the second right gear 432 of the third right gear 43 drives the shifting inner teeth 621 of the shifting sleeve gear 62 to rotate; the internal gear 621 of the gear shift sleeve 62 drives the third intermediate external gear 61 to rotate, so as to drive the third intermediate shaft 4 to rotate, and the third left gear 42 does not drive the third intermediate shaft 4 to rotate due to the third left bearing 45, so that the operating speed ratio of the variable speed traveling gear box 100 is the transmission ratio of the first right gear 23, the second right gear 33, the third right gear 43, the gear shift internal gear 621 and the third intermediate external gear 61. In one embodiment, the gearbox in this state is configured with a smaller speed ratio.

Fig. 4 is a partial structural schematic view of a variable speed traveling gearbox 100 according to an embodiment of the present application. The gear shift sleeve 62 is of a circular column structure, and the axial direction of the gear shift sleeve 62 and the axial direction of the third intermediate shaft 4 are arranged in the same direction. A limiting groove 622 is formed on the end surface of the shift sleeve 62. The limit recess 622 is an annular groove and surrounds the axis of the shift sleeve 62 for a circle.

The gear sleeve moving mechanism 63 comprises a gear shifting handle 631, a transmission rod 632 and a rocker arm 633, wherein the gear shifting handle 631 is arranged outside the box shell 1; one end of the transmission rod 632 is fixedly connected with the gear shifting handle 631, and the other end can be rotatably arranged in the box shell 1 in a penetrating way; one end of the rocker arm 633 is fixedly connected to the transmission rod 632, a moving member 636 is arranged at one end of the rocker arm, and the moving member 636 is arranged in the limiting groove 622; after the gear shifting handle 631 is rotated and the rocker arm 633 rotates by a preset angle, the moving member 636 can move a preset distance along the axial direction of the third intermediate shaft 4, and the gear shifting sleeve 62 moves a preset distance by pushing or pulling. The preset distance is a distance between the first preset position and the second preset position, and may be equal to or smaller than a distance between the first left gear 421 and the first right gear 431.

The rocker arm 633 is provided with a mounting hole 634, the moving member 636 is arranged in the mounting hole 634 through a bearing bush 635, and the moving member 636 can rotate around the axis of the moving member 636. In one embodiment, the moving member 636 is a roller, and when the moving member 636 abuts against the shift sleeve 62, the roller can rotate relative to the shift sleeve 62 to reduce friction.

The rocker arms 633 are two and are respectively located on two sides of the gear shift sleeve 62, and correspondingly, the moving member 636 is two. The stress points are increased, so that the shifting gear sleeve 62 can move more stably, and the shifting gear sleeve 62 is prevented from being clamped due to inclination.

First hole 16 has been seted up on the outer wall of case shell 1, and the inside inwards protruding mount pad 15 of establishing of case shell 1 is equipped with second hole 151 on the mount pad 15, and transfer line 632 passes first hole 16 and second hole 151 in proper order, sets up on case shell 1. A fourth bearing 17 is provided in each of the first hole 16 and the second hole 151, and the transmission lever 632 is rotatably mounted on the housing 1 through the fourth bearing 17.

In an embodiment, the moving member 636 is made of a rigid material, so as to avoid the influence of elasticity on the accuracy of the shifting action, but the limiting groove 622 is a T-shaped groove, and the moving member 636 is disposed in the limiting groove 622 and is not easy to disengage.

Fig. 5 is a schematic structural diagram of a variable speed traveling gearbox 100 according to an embodiment of the present application. The output structure 5 comprises an output shaft 52, an output ring gear 53, a sun gear set 54, a planetary gear set 55 and a planetary carrier set 56, wherein the output shaft 52 is connected with the third intermediate shaft 4; the output gear ring 53 is rotatably arranged outside the case shell 1; the sun gear set 54 is sleeved on the output shaft 52, and the sun gear set 54 is in transmission connection with the output gear ring 53 through the planetary gear set 55; the planetary gear set 55 is rotatably provided on the planetary carrier.

In one embodiment, the output shaft 52 is splined to the third intermediate shaft 4 via a spline housing 51.

Fig. 6 is a schematic structural diagram of a variable speed traveling gearbox 100 according to an embodiment of the present application. The sun gear set 54 includes a secondary sun gear 541, a tertiary sun gear 542, and a quaternary sun gear 543; the planetary gear set 55 includes a secondary planetary gear 551, a tertiary planetary gear 552, and a quaternary planetary gear 553, the secondary planetary gear 551 meshing simultaneously with the secondary sun gear 541 and the output ring gear 53; the third-stage planetary gear 552 is simultaneously meshed with the third-stage sun gear 542 and the output ring gear 53; the four-stage planetary gear 553 meshes with the four-stage sun gear 543 and the output ring gear 53 at the same time.

The planetary rotating frame group 56 comprises a secondary planetary rotating frame 561, a tertiary planetary rotating frame 562 and a quaternary planetary rotating frame 563, and a secondary planetary gear 551 is rotatably arranged on the secondary planetary rotating frame 561 through a secondary bearing 57; the third-stage planetary gear 552 is rotatably arranged on the third-stage planetary rotating frame 562 through a third-stage bearing 58; the four-stage planetary gear 553 is rotatably provided on the four-stage planetary carrier 563 via a four-stage bearing 59.

The secondary planet rotating frame 561 can be fixed on the tertiary sun gear 542 through threaded connection or internal and external tooth connection, and can rotate along with the rotation of the tertiary sun gear 542; the third-stage planetary rotating frame 562 can be fixed on the fourth-stage sun gear 543 through threaded connection or internal and external tooth connection, and can rotate along with the rotation of the fourth-stage sun gear 543; the four-stage planetary rotating frame 563 is arranged on the box shell 1 and can not rotate.

In an operation process, the output shaft 52 is driven to rotate through the third intermediate shaft 4, the output shaft 52 rotates to drive the second-stage sun gear 541, the third-stage sun gear 542 and the fourth-stage sun gear 543 to rotate, the second-stage planet gear 551, the third-stage planet gear 552 and the fourth-stage planet gear 553 are driven to rotate through the second-stage sun gear 541, the third-stage sun gear 542 and the fourth-stage sun gear 543 respectively, finally the output gear ring 53 is pushed to rotate through the second-stage planet gear 551, the third-stage planet gear 552 and the fourth-stage planet gear 553, and the output gear ring 53 drives the crawler belt to rotate. Therefore, the power split planetary differential transmission technology and the multi-stage gear differential transmission are adopted, the structure is compact, the transmission ratio is high, and the power is high.

Fig. 7 is a schematic structural diagram of a variable speed traveling gearbox 100 according to an embodiment of the present application. Case shell 1 includes left case shell 11, middle case shell 12 and right case shell 13 that connect gradually from left to right, and wherein, left case shell 11, middle case shell 12 and right case shell 13 are fixed through first bolt 14. The first input shaft 2, the second input shaft 3 and the third intermediate shaft 4 are mounted between the left housing 11 and the intermediate housing 12. The output ring gear 53 is sleeved outside the right casing 13 through a ring gear bearing 535 and can rotate relative to the right casing 13. The four-stage planetary rotor 563 is fixed to the right casing 13. The case shell 1 is of a split structure, so that the installation of each part is convenient, and the processing is convenient.

The output gear ring 53 includes a bearing seat 531, a first gear ring 532, and a second gear ring 533 connected in this order from left to right; the bearing housing 531, the first ring gear 532, and the second ring gear 533 are fixed by a second bolt 534. Bearing mount 531 mounts ring gear bearing 535. The internal teeth of the first ring gear 532 mesh with the fourth stage planetary gear 553; the internal teeth of the second ring gear 533 mesh with the tertiary planet gears 552 and the secondary planet gears 551 simultaneously.

In one embodiment, the second bolts 534 include two different bolts, which are respectively used to connect the bearing seat 531 and the first gear ring 532, and the first gear ring 532 and the second gear ring 533.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.