Gearbox transmission structure for crawler tractor

Abstract

The utility model relates to a gearbox transmission structure for a crawler tractor. The gearbox transmission structure comprises a TE driving bevel gear, a planetary reduction mechanism, a tail end driving shaft and a tail end driving shaft. A driving wheel is installed at the end of the tail end driving shaft, a speed reduction large gear is further installed on the tail end driving shaft, the speed reduction large gear is meshed with a tail end speed reduction gear, a planet carrier of the planetary speed reduction mechanism is fixedly connected with the tail end driving shaft, an inner gear is installed on the outer side of the planetary speed reduction mechanism, and a driven spiral bevel gear is arranged on the outer side of the inner gear in a sleeved mode. A planet wheel of the planet speed reducing mechanism is meshed with an inner gear ring of the inner gear, and a TE driving bevel gear is meshed with the driven spiral bevel gear. The planetary speed reduction mechanism is used as a first-stage speed reducer to provide driving force for the tail end driving shaft, the speed reduction big gear is used as a second-stage speed reducer between the tail end driving shaft and the tail end driving shaft to directly drive the driving wheel, the transmission efficiency of the two-stage speed reduction structure is high, the transmission structure is simplified, and the size of the gearbox is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to crawler tractor technical field especially relates to a transmission structure for speed changer of crawler tractor. BACKGROUND

[0002] The speed changer is one of the key components of the crawler tractor, and the transmission ratio conversion of the input shaft and the output shaft is realized through the speed changer, and the input shaft and the output shaft of the speed changer of the medium and small tractor with the power of 30 to 80 horsepower are generally realized through five-stage reduction or three-stage reduction, and the inside of the speed changer is used for installing the reduction gear and the connecting shaft, so that the inside structure of the speed changer is complex, the volume is large, and a large installation space is occupied, and it is not conducive to the simple design of the tractor. CONTENT OF UTILITY MODEL

[0003] The utility model solves the technical problem that provide a transmission structure for speed changer of crawler tractor to simplify transmission structure for speed changer of crawler tractor.

[0004] In order to solve the above technical problem, the technical scheme of the utility model is as follows: a transmission structure for speed changer of crawler tractor, including TE driving bevel gear, planetary reduction mechanism, end driving shaft and end driving shaft, the end of end driving shaft is installed with drive wheel, still be installed with reduction large gear on end driving shaft, reduction large gear is engaged with the end reduction gear of end driving shaft end, the planet carrier of planetary reduction mechanism is fixedly connected with end driving shaft, the outside of planetary reduction mechanism is installed with internal gear, the outside of internal gear is equipped with driven spiral bevel gear, the planet wheel of planetary reduction mechanism is engaged with the inner tooth ring of internal gear, TE driving bevel gear is engaged with driven spiral bevel gear.

[0005] As a preferred technical scheme, the planetary reduction mechanism includes a sun gear, a planet wheel and a planet carrier, the sun gear includes a large sun gear, a sun gear shaft extends from one side of the large sun gear, an end of the sun gear shaft is provided with an end small sun gear, the planet wheel is arranged around the end small sun gear and engaged with the end small sun gear, the planet wheel is arranged around the end small sun gear and engaged with the end small sun gear, and the wheel shaft of the planet wheel is connected with the planet carrier.

[0006] As a preferred technical scheme, the sun gear shaft is an internally hollow installation channel, the other end of the sun gear shaft is installed in the center hole of the planet carrier, the end of the end driving shaft is inserted into the center channel of the sun gear shaft from one end of the large sun gear, and the end of the end driving shaft is fixedly connected with the planet carrier through a high-low gear inner tooth ring and the planet carrier by extending out of one end of the sun gear shaft.

[0007] As a preferred technical scheme, the large sun gear is engaged with a steering motor gear.

[0008] As a preferred technical scheme, the planetary reduction mechanism is two groups, respectively driving one end of the main shaft, the inner ring of the internal gear is symmetrically provided with an internal gear ring meshing with the planetary gear, and the outer circumferential surface of the internal gear is provided with a limiting table combined with the driven spiral bevel gear.

[0009] As a preferred technical scheme, the two sides of the internal gear are provided with a gland, one end of the planet carrier is supported on the inner end face of the gland, the gland is provided with a central shaft sleeve coaxial with the sun shaft, the sun shaft passes through the central shaft sleeve, and a cylindrical roller bearing is installed between the sun shaft and the central shaft sleeve.

[0010] As a preferred technical scheme, the end of the main bearing seat is installed on the gearbox housing, and a tapered roller bearing is installed between the sun shaft and the sun shaft.

[0011] Due to the adoption of the above technical scheme, the beneficial effects of the present application are:

[0012] 1. The planetary reduction mechanism is used as a one-stage reduction to provide driving force for the end of the main shaft, and the end of the main shaft and the end of the driving shaft are directly driven by a reduction gear as a two-stage reduction, so that the two-stage reduction structure has high transmission efficiency, the transmission structure of the 30 to 80 horsepower small-sized track-type tractor gearbox is simplified, and the volume of the gearbox is reduced.

[0013] 2. The sun gear set is composed of a large sun gear and an end small sun gear, the end small sun gear meshes with the planetary gear to drive the planet carrier to rotate and drive the end of the main shaft, the large sun gear is linked with the steering mechanism, the end of the main shaft passes through the inside of the sun shaft, the structure of the intermediate shaft and related transmission gears is reduced, the intermediate shaft is not needed, and the power transmission between the engine and the driving wheel can be realized only by using the planetary mechanism, and the structure design is ingenious. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0015] Fig. 1 is a structural schematic view of an embodiment of the present application;

[0016] Fig. 2 is an installation schematic view of an embodiment of the present application in the gearbox;

[0017] Fig. 3The structural schematic diagram of the planetary reduction mechanism in the embodiment of the utility model;

[0018] In the figure: 100 - gearbox housing; 103 - end driving bearing seat; 2 - end driving shaft; 201 - end reduction gear; 3 - end driving shaft; 31 - reduction gear; 41 - sun gear set; 41a - large sun gear; 41b - end small sun gear; 41c - sun gear shaft; 42 - planetary gear; 43 - planetary carrier; 44 - high-low gear inner tooth ring; 5 - inner gear; 501 - limiting table; 51 - driven spiral bevel gear; 52 - TE driving bevel gear; 521 - TE driving bevel gear shaft; 53 - gland; 54 - cylindrical roller bearing; 56 - tapered roller bearing; 6 - driving wheel. DETAILED DESCRIPTION

[0019] As Figs. 1 to 3 shown, a gearbox transmission structure for a tracked tractor, comprising a TE driving bevel gear 52, an end driving shaft 2, an end driving shaft 3 and a planetary reduction mechanism, wherein the end driving shaft 2, the end driving shaft 3 and the planetary reduction mechanism are both two groups, used for driving two driving wheels 6.

[0020] The planetary reduction mechanism comprises a sun gear set 41, a planetary gear 42 and a planetary carrier 43, the sun gear set 41 comprising a large sun gear 41a, the large sun gear 41a being engaged with a steering motor gear.

[0021] The center position of the large sun gear 41a is integrally connected with a sun gear shaft 41c, the end of the sun gear shaft 41c is provided with an end small sun gear 41b, the planetary gear 42 is arranged around the end small sun gear 41b and is engaged with the end small sun gear 41b, and the wheel shaft of the planetary gear 42 is connected with the planetary carrier 43.

[0022] The planetary carrier 43 is fixedly connected with the end driving shaft 2, specifically, the inside of the sun gear shaft 41c is provided with a mounting channel, the mounting channel penetrates through the large sun gear 41a, the sun gear shaft 41c and the end small sun gear 41b, one end of the end driving shaft 2 is provided with an end reduction gear 201, the other end penetrates through the mounting channel of the sun gear shaft 41c, extends out from the end small sun gear 41b, and is fixedly connected with the planetary carrier 43 through a high-low gear inner tooth ring 44.

[0023] The end driving shaft 3 is further provided with a reduction gear 31, and the reduction gear 31 is engaged with the end reduction gear 201.

[0024] The inner gear 5 is provided with two sets of internal gear rings symmetrically on the inner wall, two sets of planetary reduction mechanisms are installed inside the inner gear 5, and the internal gear rings on the inner gear 5 are each engaged with a set of planetary gears 42, the outer side of the inner gear 5 is sleeved with a driven spiral bevel gear 51, the outer circumferential surface of the inner gear 5 is provided with a limiting table 501 combined with the driven spiral bevel gear 51, the driven spiral bevel gear 51 is engaged with a TE driving bevel gear 52, and the TE driving bevel gear 52 is integrally connected with a TE driving bevel gear shaft 521.

[0025] The inner gear 5 is provided with two sets of internal gear rings symmetrically on the inner wall, two sets of planetary reduction mechanisms are installed inside the inner gear 5, and the internal gear rings on the inner gear 5 are each engaged with a set of planetary gears 42, the outer side of the inner gear 5 is sleeved with a driven spiral bevel gear 51, the outer circumferential surface of the inner gear 5 is provided with a limiting table 501 combined with the driven spiral bevel gear 51, the driven spiral bevel gear 51 is engaged with a TE driving bevel gear 52, and the TE driving bevel gear 52 is integrally connected with a TE driving bevel gear shaft 521.

[0026] The inner gear 5 is provided with two sets of internal gear rings symmetrically on the inner wall, two sets of planetary reduction mechanisms are installed inside the inner gear 5, and the internal gear rings on the inner gear 5 are each engaged with a set of planetary gears 42, the outer side of the inner gear 5 is sleeved with a driven spiral bevel gear 51, the outer circumferential surface of the inner gear 5 is provided with a limiting table 501 combined with the driven spiral bevel gear 51, the driven spiral bevel gear 51 is engaged with a TE driving bevel gear 52, and the TE driving bevel gear 52 is integrally connected with a TE driving bevel gear shaft 521.

[0027] The transmission mode of the utility model is: the power of engine is transmitted to the gearbox through the TE driving bevel gear shaft 521 and the TE driving bevel gear 52, the TE driving bevel gear 52 drives the driven spiral bevel gear 51 to rotate, the driven spiral bevel gear 51 rotates synchronously with the inner gear 5, the inner gear 5 is engaged with the planetary gear 42, drives the planetary carrier 43 to rotate, the planetary carrier 43 is fixedly connected with the terminal driving shaft 2, and the power is transmitted to the terminal reduction gear 201 at the end of the terminal driving shaft 2, the reduction gear 31 further installed on the terminal driving shaft 3 is engaged with the terminal reduction gear 201, the reduction gear 31 drives the terminal driving shaft 3 to rotate, and the driving wheel 6 rotates to realize the normal driving of the tractor.

[0028] The basic principle, main features and advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principle of the utility model, and various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A gearbox transmission structure for a tracked tractor, characterized in that, It includes a TE driving bevel gear, a planetary reduction mechanism, an end drive shaft, and an end drive shaft; a drive wheel is installed at the end of the end drive shaft, and a large reduction gear is also installed on the end drive shaft. The large reduction gear meshes with the end reduction gear at the end of the end drive shaft. The planet carrier of the planetary reduction mechanism is fixedly connected to the end drive shaft. An internal gear is installed on the outside of the planetary reduction mechanism, and a driven spiral bevel gear is sleeved on the outside of the internal gear. The planetary gears of the planetary reduction mechanism mesh with the internal gear ring of the internal gear. The TE driving bevel gear meshes with the driven spiral bevel gear.

2. The transmission structure for a gearbox in a tracked tractor as described in claim 1, characterized in that: The planetary reduction mechanism includes a sun gear assembly, planet gears, and a planet carrier. The sun gear assembly includes a large sun gear, and a sun gear shaft extends from the large sun gear to one side. A small end sun gear is provided at the end of the sun gear shaft. The planet gears mesh with the small end sun gears, and the axles of the planet gears are connected to the planet carrier.

3. The transmission structure for a gearbox in a tracked tractor as described in claim 2, characterized in that: The sun gear shaft is a hollow mounting channel. The other end of the sun gear shaft is installed in the central hole of the planet carrier. The end of the end drive shaft 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 extends out of one end of the sun gear shaft and is fixedly connected to the planet carrier through a high and low gear internal gear ring.

4. A gearbox transmission structure for a tracked tractor as described in claim 2 or 3, characterized in that: The large sun gear meshes with the steering motor gear.

5. A gearbox transmission structure for a tracked tractor as described in claim 1 or 2, characterized in that: The planetary reduction mechanism consists of two sets, each driving a terminal drive shaft. The inner ring of the internal gear is symmetrically provided with an internal gear ring that meshes with the planet gear. The outer circumference of the internal gear is provided with a limiting platform that engages with the driven spiral bevel gear.

6. The transmission structure for a gearbox in a tracked tractor as described in claim 2, characterized in that: The internal gear is provided with pressure caps on both sides, one end of the planetary carrier is supported on the inner end face of the pressure cap, the pressure cap is provided with a central bushing coaxial with the sun gear shaft, the sun gear shaft passes through the central bushing, and a cylindrical roller bearing is installed between the sun gear shaft and the central bushing.

7. The gearbox transmission structure for a tracked tractor as described in claim 6, characterized in that: An end drive bearing housing is mounted on the gearbox housing, and a tapered roller bearing is installed between the end drive bearing housing and the sun gear shaft.

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