Gearbox differential steering mechanism for crawler tractor

Abstract

The utility model relates to a gearbox differential steering mechanism for a crawler tractor, which comprises a gearbox shell, a steering hydraulic motor is mounted on one side of the gearbox shell, the output end of the steering hydraulic motor is connected with a hydraulic motor output gear, and a primary steering shaft is further mounted in the gearbox shell. A left motor gear and a right motor gear are installed at the two ends of the primary steering shaft, the right motor gear is meshed with the hydraulic motor output gear, the left motor gear is meshed with the reverse gear, the right motor gear and the reverse gear are in transmission connection with the driving wheel transmission mechanism, and the driving wheel transmission mechanism comprises a planetary speed reduction mechanism, a tail end driving shaft and a tail end driving shaft. The two large sun gears are driven by the right motor gear and the reverse gear to rotate in different directions, the two driving wheels are directly driven to rotate in opposite directions, the steering speed is high, steering is flexible, pivot steering can be achieved when a vehicle is in a static state, and the vehicle can adapt to operation in areas with severe terrains such as mountains and hills.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, and in particular to a differential steering mechanism for a tracked tractor gearbox. Background Technology

[0002] The gearbox is one of the key components of a tracked tractor. It enables the conversion of the transmission ratio between the input and output shafts. Steering is usually achieved through the differential, which controls the speed difference between the left and right wheels. When steering, since the left and right wheels are still in motion, steering while in motion results in a longer tractor travels a longer distance and a slower reaction time. Therefore, the differential steering process has a certain lag. In some special areas such as mountainous terrain, it is not possible to achieve rapid steering, which causes inconvenience to the operation of tracked tractors. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a differential steering mechanism for a tracked tractor gearbox to improve the steering speed of the gearbox.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a differential steering mechanism for a tracked tractor gearbox, including a gearbox housing, a steering hydraulic motor installed on one side of the gearbox housing, a hydraulic motor output gear connected to the output end of the steering hydraulic motor, a primary steering shaft installed inside the gearbox housing, a left motor gear and a right motor gear installed at both ends of the primary steering shaft, the right motor gear meshing with the hydraulic motor output gear, the left motor gear meshing with a reverse gear, the right motor gear and the reverse gear being respectively connected to drive wheel transmission mechanisms for driving the left and right wheels, and the two sets of drive wheel transmission mechanisms being symmetrically arranged;

[0005] The drive wheel transmission mechanism includes a planetary reduction mechanism, an end drive shaft, and an end drive shaft. The planetary reduction mechanism includes a sun gear set, planet gears, and a planet carrier. The sun gear set includes a large sun gear, and a sun gear shaft extends from the large sun gear to one side. The sun gear shaft is an internally hollow mounting channel. The other end of the sun gear shaft is provided with an end small sun gear, which meshes with the planet gears inside the planet carrier. One end of the end drive shaft is provided with an end reduction gear, and the other end is inserted into the central channel of the sun gear shaft from one end of the large sun gear. The end of the end drive shaft extending out of the sun gear shaft is fixedly connected to the planet carrier through a high and low gear internal gear ring.

[0006] The right motor gear and the reverse gear each mesh with the large sun gear of a planetary reduction mechanism;

[0007] A large reduction gear is also installed on the end drive shaft, and the large reduction gear meshes with the end reduction gear.

[0008] As a preferred technical solution, the gearbox also has an internal gear installed inside. The internal gear has symmetrically arranged internal gear rings on the inner walls near both ends. Two sets of planetary reduction mechanisms are installed inside the internal gear, and the planetary gears of the planetary reduction mechanisms mesh with the internal gear rings of the internal gear. A driven spiral bevel gear is sleeved on the outer side of the internal gear, and the driven spiral bevel gear meshes with the TE driving bevel gear.

[0009] As a preferred technical solution, the gear shaft of the reverse gear is mounted on the gearbox housing, both ends of the primary steering shaft extend out of the outside of the gearbox housing, and the left motor gear and the right motor gear are mounted on the outside of the gearbox.

[0010] As a preferred technical solution, the primary steering shaft is mounted on the top of the gearbox housing. Mounting holes are provided on both side plates of the gearbox housing to facilitate the passage of the primary steering shaft. A bearing housing is installed in the mounting hole on the left side, and a needle roller bearing is installed inside the bearing housing. The left end of the primary steering shaft passes through the needle roller bearing, and a deep groove ball bearing is installed in the mounting hole on the right side. The right end of the primary steering shaft passes through the needle roller bearing.

[0011] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0012] 1. This utility model is applicable to small and medium-sized tracked tractors with 30 to 80 horsepower. The tractor steering control is achieved by driving the two large sun gears to rotate in different directions through the right motor gear and the reverse gear, directly driving the two drive wheels to rotate in opposite directions. The steering speed is fast and the steering is flexible. It can turn on the spot when the vehicle is stationary and can adapt to operation in areas with harsh terrain such as mountains and hills.

[0013] 2. This utility model achieves differential steering by linking the steering gear with the planetary reduction mechanism. Compared with the existing gearbox, it does not use a differential, has a simple structure, and the steering gear and the transmission mechanism of the gearbox work together to complete the steering. The steering mechanism occupies less space in the gearbox.

[0014] 3. When turning, the steering gear directly drives the planetary reduction mechanism. The planetary reduction mechanism serves as the first-stage reduction mechanism, and the large reduction gear serves as the second-stage reduction mechanism. Compared with the five-stage or three-stage reduction mechanism of traditional gearboxes, the transmission efficiency is higher, and the steering is timely and rapid. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0017] Figure 2 This is a schematic diagram of another aspect of the present invention.

[0018] Figure 3 This is a schematic diagram of the installation structure of this utility model inside the gearbox;

[0019] Figure 4 This is a schematic diagram of the planetary reduction mechanism in this utility model;

[0020] In the diagram: 100-Gearbox housing; 2-End drive shaft; 201-End reduction gear; 3-End drive shaft; 31-Large reduction gear; 41-Sun gear set; 41a-Large sun gear; 41b-End small sun gear; 41c-Sun gear shaft; 42-Planet gears; 43-Planet carrier; 44-High and low gear internal ring gears; 5-Internal gear; 51-Driven spiral bevel gear; 52-TE drive bevel gear; 521-TE drive bevel gear shaft; 53-Gland; 54-Cylindrical roller bearing; 6-Drive wheel; 70-Steering hydraulic motor; 71-Hydraulic motor output gear; 72-First stage steering shaft; 73-Left motor gear; 74-Right motor gear; 75-Reverse gear; 76-Needle roller bearing; 77-Deep groove ball bearing. Detailed Implementation

[0021] like Figures 1 to 4 As shown, a differential steering mechanism for a tracked tractor includes a gearbox housing 100. A steering hydraulic motor 70 is mounted on one side of the gearbox housing 100. The output end of the steering hydraulic motor 70 is connected to a hydraulic motor output gear 71. A primary steering shaft 72 is mounted on the top of the gearbox housing 100. A left motor gear 73 and a right motor gear 74 are respectively mounted on both ends of the primary steering shaft 72. The right motor gear 74 meshes with the hydraulic motor output gear 71, and the left motor gear 73 meshes with a reverse gear 75. The right motor gear 74 and the reverse gear 75 are respectively connected to drive wheel transmission mechanisms for driving the left and right wheels. The two sets of drive wheel transmission mechanisms are symmetrically arranged.

[0022] The drive wheel transmission mechanism includes a planetary reduction mechanism, an end drive shaft 2, and an end drive shaft 3.

[0023] The gearbox housing contains two sets of planetary reduction mechanisms. The planetary reduction mechanisms include a sun gear set 41, planet gears 42, and a planet carrier 43. The sun gear set 41 includes a large sun gear 41a. A sun gear shaft 41c is integrally connected to the center of the large sun gear 41a. A small end sun gear 41b is provided at the end of the sun gear shaft 41c. The planet gears 42 are arranged around the small end sun gear 41b and mesh with the small end sun gear 41b. The axles of the planet gears 42 are connected to the planet carrier 43.

[0024] The sun gear shaft 41c has an internal mounting channel that passes through the large sun gear 41a, the sun gear shaft 41c and the end small sun gear 41b. The end drive shaft 2 passes through the mounting channel, and one end of the end drive shaft 2 passes through the mounting channel of the sun gear shaft 41c, extends out from the end small sun gear 41b, and is fixedly connected to the planet carrier 43 through the high and low gear internal gear ring 44.

[0025] The right motor gear 74 and the reverse gear 75 each mesh with the large sun gear of a planetary reduction mechanism.

[0026] An internal gear 5 is also installed inside the gearbox housing 100. Two sets of internal gear rings are symmetrically arranged on the inner wall of the internal gear 5. Two sets of planetary reduction mechanisms are installed inside the internal gear 5, and each of the internal gear rings on the internal gear 5 meshes with a set of planetary gears 42. A driven spiral bevel gear 51 is sleeved on the outer side of the internal gear 5. The driven spiral bevel gear 51 meshes with the TE driving bevel gear 52. The front end of the TE driving bevel gear 52 is integrally provided with a TE driving bevel gear shaft 521, which extends from the front end of the gearbox housing 100. Pressure caps 53 are provided on both sides of the internal gear 5. One end of the planetary carrier 43 is supported on the inner end face of the pressure cap 53. A central bushing coaxial with the sun gear shaft 41c is provided on the pressure cap 53. The sun gear shaft 41c passes through the central bushing. A cylindrical roller bearing 54 is installed between the sun gear shaft 41c and the central bushing of the pressure cap 53.

[0027] The gearbox housing 100 has end drive shafts 3 installed on both sides, and a large reduction gear 31 is also installed on the end drive shafts 3. The end drive shaft 2 extends to the outside of the gearbox and has an end reduction gear 201. The large reduction gear 31 meshes with the end reduction gear 201.

[0028] The gear shaft of the reverse gear 75 is mounted on the gearbox housing 100, the two ends of the first-stage steering shaft 72 extend out of the outside of the gearbox housing 100, and the left motor gear 73 and the right motor gear 74 are mounted on the outside of the gearbox housing 100.

[0029] The primary steering shaft 72 is mounted on the top of the gearbox housing 100. Mounting holes for the primary steering shaft 72 are provided on both side plates of the gearbox housing 100. Bearing housings are installed in these mounting holes. A needle roller bearing 76 is installed inside the bearing housing on the left side, through which the left end of the primary steering shaft 72 passes. A deep groove ball bearing 77 is installed in the bearing housing on the right side, through which the right end of the primary steering shaft 72 passes.

[0030] When steering is performed, the steering hydraulic motor 70 rotates, and the output gear 71 of the hydraulic motor meshes with the right motor gear 74, driving the primary steering shaft 72 to rotate. The left motor gear 73 at the other end of the primary steering shaft 72 drives the reverse gear 75 to rotate. The right motor gear 74 and the reverse gear 75 rotate in opposite directions. The right motor gear 74 and the reverse gear 75 each mesh with a set of planetary reduction gears, causing the two large sun gears 41a to rotate in opposite directions. The end small sun gear 41b, which rotates synchronously with the large sun gears 41a, drives the end small sun gear 41b to rotate. The planetary gear 42 meshing with the planetary gear 41b rotates, which drives the planetary carrier 43 to rotate accordingly. The end drive shaft 2, which is fixedly connected to the planetary carrier 43, rotates synchronously. The end reduction gear 201 at the end of the end drive shaft 2 meshes with the reduction gear 31, driving the drive wheel 6 to rotate. Since the two large sun gears 41a rotate in opposite directions, the torque transmitted to the drive wheel 6 through the end drive shaft 2 and the end drive shaft 3 also rotates in opposite directions. Under the action of two torques with different directions, the two drive wheels 6 rotate in opposite directions, thereby realizing the steering of the tractor.

[0031] In traditional reducers, the drive wheels rotate in the same direction when turning. Due to the different speeds of the left and right drive wheels, a speed difference is formed, and turning is achieved slowly during driving. In this invention, the left and right drive wheels are subjected to torques with different rotation directions, which can complete the tractor turning more quickly, and even turn on the spot when the vehicle speed is zero.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A differential steering mechanism for a track-type tractor transmission, characterized by, The gearbox housing is provided with a steering hydraulic motor on one side, the output end of the steering hydraulic motor is connected with a hydraulic motor output gear, a first steering shaft is also installed inside the gearbox housing, the left and right motor gears are respectively installed on the two ends of the first steering shaft, the right motor gear is engaged with the hydraulic motor output gear, the left motor gear is engaged with a reverse gear, the right motor gear and the reverse gear are respectively in transmission connection with drive wheel transmission mechanisms for driving the left and right wheels, and the two groups of drive wheel transmission mechanisms are symmetrically arranged; The drive wheel transmission mechanism comprises a planetary reduction mechanism, a terminal driving shaft and a terminal driving shaft, the planetary reduction mechanism comprises a sun gear set, a planet wheel and a planet carrier, the sun gear set comprises a large sun gear, a sun gear shaft is extended from the large sun gear to one side, the sun gear shaft is a hollow installation channel, the other end of the sun gear shaft is provided with a terminal small sun gear, the terminal small sun gear is engaged with the planet wheel inside the planet carrier, one end of the terminal driving shaft is provided with a terminal reduction gear, the other end of the terminal driving shaft is inserted into the central channel of the sun gear shaft from one end of the large sun gear, and one end of the terminal driving shaft extending out of the sun gear shaft is fixedly connected with the planet carrier through a high-low gear inner tooth ring. The right motor gear and the reverse gear are respectively engaged with the large sun gears of one group of planetary reduction mechanisms. The terminal driving shaft is also provided with a reduction large gear, and the reduction large gear is engaged with the terminal reduction gear.

2. A differential steering mechanism for a track-type tractor transmission as set forth in claim 1, wherein: An inner gear is also installed in the gearbox, inner tooth rings are symmetrically arranged on the inner walls close to the two end faces of the inner gear, two groups of the planetary reduction mechanisms are installed inside the inner gear, the planet wheels of the planetary reduction mechanisms are engaged with the inner tooth rings of the inner gear, and a driven spiral bevel gear is sleeved on the outer side of the inner gear and engaged with a TE driving bevel gear.

3. A differential steering mechanism for a track-type tractor transmission as set forth in claim 1, wherein: The gear shaft of the reverse gear is installed on the gearbox housing, the two ends of the first steering shaft extend out of the gearbox housing, and the left and right motor gears are installed on the outer side of the gearbox.

4. A differential steering mechanism for a track-type tractor transmission as set forth in claim 1, wherein: The first steering shaft is installed on the top of the gearbox housing, installation holes are arranged on the two side plates of the gearbox housing and used for facilitating the first steering shaft to pass through, a bearing seat is installed in the left installation hole, a needle bearing is installed in the bearing seat, the left end of the first steering shaft passes through the needle bearing, a deep groove ball bearing is installed in the right installation hole, and the right end of the first steering shaft passes through the deep groove ball bearing.

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