Internal drive type gearbox for crawler tractor

Abstract

The utility model relates to an internal drive type gearbox for a crawler tractor, which is characterized in that two groups of planetary speed reducing mechanisms are arranged in a gearbox shell, tail end driving shafts are arranged on two sides of the gearbox shell, speed reducing bull gears are further arranged on the tail end driving shafts, and a tail end speed reducing gear is arranged at one end, extending to the outer side of the gearbox, of each tail end driving shaft; the speed reduction bull gear is meshed with the tail end speed reduction gear; the axis distance between the tail end driving shaft and the tail end driving shaft is 172mm + / -5mm, and a planetary speed reduction mechanism is driven by an inner gear in the gearbox. The planetary reduction mechanism is installed in the gearbox, and external drive is changed into internal drive. The planetary speed reduction mechanism and the speed reduction large gear are installed between the tail end driving shaft and the tail end driving shaft, two-stage speed reduction of the gearbox is achieved, the transmission mechanism is simpler in structure, and the transmission efficiency is high. The gearbox shell is small in size, the size of the gearbox shell is consistent with the reserved size of a conventional gearbox, an existing gearbox can be replaced, and universality is high.

Description

Technical Field

[0001] This utility model relates to the field of tractor technology, and in particular to an internal drive gearbox for tracked tractors. Background Technology

[0002] The gearbox is one of the key components of a tractor. It realizes the conversion of the transmission ratio between the input shaft and the output shaft. The input shaft and the output shaft of the tractor gearbox are generally connected by a five-stage reduction or a three-stage reduction. The gearbox is used to install the reduction gears and connecting shafts of each stage, which makes the internal structure of the gearbox complex, bulky and requires a lot of installation space, which is not conducive to the lightweight and simplified design of the tractor.

[0003] Currently, in small and medium-sized tracked tractors with 30 to 80 horsepower, due to the small size of the gearbox, the planetary reduction mechanism is generally installed on the outside of the gearbox. The planetary reduction mechanism drives the transmission mechanism inside the gearbox from the outside. Although the size of the gearbox remains unchanged, this design still requires sufficient installation space to be reserved on the tractor for the installation of the planetary mechanism, which increases the difficulty of gearbox installation and is not conducive to the technological development of tractor miniaturization. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an internal drive gearbox for tracked tractors, which simplifies the transmission mechanism of the gearbox to adapt to the installation and maintenance of small tractors.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: an internal drive gearbox for a tracked tractor, comprising a gearbox housing, inside which two sets of planetary reduction mechanisms are installed. Each planetary reduction mechanism includes a sun gear set, planet gears, and a planet carrier. The planet carrier is fixedly connected to an end drive shaft. One end of the end drive shaft extends to the outside of the gearbox. End drive shafts are installed on both sides of the gearbox housing. A large reduction gear is also installed on the end drive shaft. An end reduction gear is provided at the end of the end drive shaft extending to the outside of the gearbox. The large reduction gear meshes with the end reduction gear. The center distance between the end reduction gear and the large reduction gear is 172mm ± 5mm. The gearbox also includes an internal gear with a diameter of 72mm ± 5mm. Two sets of internal teeth are symmetrically arranged on the inner wall of the internal gear. The two sets of planetary reduction mechanisms are installed inside the internal gear, and each of the internal teeth on the internal gear meshes with a set of planetary gears. A driven spiral bevel gear is sleeved on the outer side of the internal gear. The driven spiral bevel gear meshes with the TE driving bevel gear. The front end of the TE driving bevel gear is integrally provided with a TE driving bevel gear shaft. The TE driving bevel gear shaft extends from the front end of the gearbox housing. The installation distance from the front end face of the TE driving bevel gear to the axis of the end driving shaft is 129mm ± 5mm, and the installation distance from the central axis of the TE driving bevel gear to the rear end face of the driven spiral bevel gear is 47mm ± 5mm.

[0006] As a preferred technical solution, the sun gear assembly of the planetary reduction mechanism is coaxial with the end drive shaft.

[0007] As a further improvement, the sun gear assembly includes a large sun gear, a sun gear shaft integrally connected to the center of the large sun gear, a small end sun gear at the end of the sun gear shaft, planet gears arranged around the small end sun gear and meshing with the small end sun gear, and the axles of the planet gears connected to the planet carrier.

[0008] As a further improvement, the sun gear shaft has an internal mounting channel. One end of the end drive shaft passes through the mounting 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 connected to the planet carrier through a high and low gear internal gear ring.

[0009] As another improvement, 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.

[0010] As a preferred technical solution, the gearbox has drive shaft holes on both sides to facilitate the passage of the end drive shaft and drive shaft holes to facilitate the passage of the end drive shaft.

[0011] As a further improvement, an end-drive bearing housing is installed in the drive shaft hole, and a tapered roller bearing is installed between the end-drive bearing housing and the central sleeve of the pressure cap.

[0012] As a further improvement, an adjusting nut is installed on the outer side of the end active bearing housing. The outer wall of the adjusting nut has multiple slots distributed in a ring. An "L"-shaped locking piece is engaged in the slot. The engaging end of the locking piece is engaged in the slot, and its fixed end is fixed to the gearbox housing by a fastener.

[0013] As another improvement, an end drive bearing housing is installed in the drive shaft hole, and a deep groove ball bearing is installed between the end drive bearing housing and the end drive shaft.

[0014] As another improvement, the gearbox housing is further provided with a transmission housing on both sides, which covers the outside of the end drive shaft and the end drive shaft. One end of the end drive shaft extends out of the transmission housing and is connected to the drive wheel, and one end of the end drive shaft extends out of the transmission housing and is connected to the brake.

[0015] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0016] 1. The planetary reduction mechanism is installed inside the gearbox, becoming part of the transmission mechanism inside the gearbox, changing external drive to internal drive, and no longer occupying the installation space outside the gearbox.

[0017] 2. A planetary reduction mechanism and a large reduction gear are installed between the end drive shaft and the end drive shaft to achieve two-stage reduction of the gearbox. Compared with conventional five-stage or three-stage reduction gearboxes, the transmission mechanism structure is more streamlined and the transmission efficiency is higher.

[0018] 3. The gearbox housing is small in size, but the sun gear is coaxial with the end drive shaft, and the center distance between the end reduction gear and the large reduction gear is maintained at 172mm±5mm, which is consistent with the reserved size of conventional gearboxes. It can directly replace the gearboxes of existing 30-80 horsepower small and medium tractors, and has strong versatility. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0021] Figure 2 yes Figure 1 Schematic diagram of the structure of AA;

[0022] Figure 3 This is a schematic diagram of the transmission structure of the gearbox in an embodiment of this utility model;

[0023] Figure 4 yes Figure 3 A structural diagram from another angle;

[0024] Figure 5 This is a schematic diagram of the planetary deceleration mechanism in an embodiment of this utility model;

[0025] In the diagram: 100-Gearbox housing; 101-Drive shaft bore; 102-Drive shaft bore; 103-End drive bearing housing; 104-End drive bearing housing; 105-Transmission housing; 2-End drive shaft; 201-End reduction gear; 3-End drive shaft; 31-Large reduction gear; 32-Deep groove ball bearing; 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-Glander cap; 54-Cylindrical roller bearing; 55-Adjusting nut; 56-Tapered roller bearing; 57-Locking plate; 6-Drive wheel; 70-Steering hydraulic motor; 71-Hydraulic motor output gear; 72-First-stage steering shaft. Detailed Implementation

[0026] like Figures 1 to 5 As shown, an internal drive gearbox for a tracked tractor includes a gearbox housing 100, which includes a front housing and a rear housing, separated by a partition. An end drive shaft 2 and an end drive shaft 3 are installed inside the gearbox housing 100. The two sides of the gearbox housing are provided with drive shaft holes 101 for the end drive shaft to pass through and drive shaft holes 102 for the end drive shaft to pass through. One end of the end drive shaft 101 passes through the drive shaft hole, and one end of the end drive shaft passes through the drive shaft hole 102. A drive wheel 6 is installed on the end drive shaft 3.

[0027] 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.

[0028] The sun gear set 41 of the planetary reduction mechanism is coaxial with the end drive shaft 2, wherein the large sun gear 41a is located outside the gearbox housing 100, and the sun gear shaft 41c passes through the drive shaft hole into the gearbox housing 100.

[0029] The planetary carrier 43 is fixedly connected to the end drive shaft 2. One end of the end drive shaft 2 extends to the outside of the gearbox housing 100. Specifically, the sun gear shaft 41c has an installation channel inside. The installation channel 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 installation channel. One end of the end drive shaft 2 passes through and exits from the drive shaft hole 101, and the other end passes through the installation channel of the sun gear shaft 41c. It extends out from the end small sun gear 41b and is fixedly connected to the planetary carrier 43 through the high and low gear internal gear ring 44.

[0030] The gearbox housing 100 has end drive shafts 3 mounted on both sides, and a large reduction gear 31 is also mounted on the end drive shafts 3. An end reduction gear 201 is provided at one end of the end drive shaft 2 extending to the outside of the gearbox. The large reduction gear 31 meshes with the end reduction gear 201. Preferably, in order to replace the gearbox of existing 30-80 horsepower small and medium-sized tractors, such as... Figure 1 As shown, the center distance between the end drive shaft 2 and the end drive shaft 3 is also the center distance between the end reduction gear 201 and the reduction gear a = 172mm ± 5mm.

[0031] The gearbox also includes an internal gear 5, which is 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 internal gear ring 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 a TE driving bevel gear 52. A TE driving bevel gear shaft 521 is integrally provided at the front end of the TE driving bevel gear 52, extending from the front end of the gearbox housing 100. Specifically, the TE driving bevel gear 52 is installed in the front compartment of the gearbox housing 100, and the TE driving bevel gear shaft 521 at the front end of the TE driving bevel gear 52 extends from the front compartment of the gearbox housing 100. The TE driving bevel gear 52 passes through the partition of the gearbox housing 100 and extends to the rear compartment, meshing with the driven spiral bevel gear 51. Figure 2 and 4 As shown, the installation distance c from the front end face of the TE drive bevel gear 52 to the axis of the end drive shaft 2 is 129mm ± 5mm, and the installation distance b from the central shaft of the TE drive bevel gear to the rear end face of the driven spiral bevel gear is 47mm ± 5mm.

[0032] The internal gear 5 has pressure caps 53 on both sides. One end of the planet carrier 43 is supported on the inner end face of the pressure cap 53. The pressure cap 53 has a central bushing coaxial with the sun gear shaft 41c. 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.

[0033] An end drive bearing housing 103 is installed inside the drive shaft hole 101, and a tapered roller bearing 56 is installed between the end drive bearing housing 103 and the central sleeve of the pressure cover.

[0034] To adjust the position of the internal gear, an adjusting nut 55 is installed on the outer side of the end drive bearing housing 103. The outer wall of the adjusting nut 55 has multiple grooves distributed in a ring. An "L"-shaped locking piece 57 is engaged in the groove. The engaging end of the locking piece 57 is engaged in the groove, and its fixed end is fixed to the gearbox housing 100 by a fastener. When the position of the internal gear is adjusted, the engaging end of the locking piece 57 is engaged in the groove, and the fixed end of the locking piece 57 is fixed to the gearbox housing 100.

[0035] An end drive bearing housing 104 is installed in the drive shaft hole 102, and a deep groove ball bearing 32 is installed between the end drive bearing housing 104 and the end drive shaft 3.

[0036] The gearbox housing 100 is also provided with a transmission housing 105 on both sides, which covers the outer side of the end drive shaft 2 and the end drive shaft 3. One end of the end drive shaft 3 extends out of the transmission housing 105 and is connected to the drive wheel 6. One end of the end drive shaft 2 extends out of the transmission housing 105 and is connected to the brake.

[0037] A steering hydraulic motor 70 is installed 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 that rotates synchronously with the hydraulic motor output gear 71 is also installed on the top of the gearbox housing 100. Left and right steering gears are installed at both ends of the primary steering shaft 72.

[0038] 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. An internal drive gearbox for a tracked tractor, characterized in that: The system includes a gearbox housing, inside which two sets of planetary reduction mechanisms are installed. Each planetary reduction mechanism includes a sun gear set, planet gears, and a planet carrier. The planet carrier is fixedly connected to the end drive shaft. One end of the end drive shaft extends to the outside of the gearbox. End drive shafts are installed on both sides of the gearbox housing. A large reduction gear is installed on the end drive shaft. An end reduction gear is provided at the end of the end drive shaft extending to the outside of the gearbox. The large reduction gear meshes with the end reduction gear. The center distance between the end reduction gear and the large reduction gear is 172mm ± 5mm. The gearbox also includes an internal gear, on which two sets of internal gear rings are symmetrically arranged. The two sets of planetary reduction mechanisms are installed inside the internal gear, and each of the internal gear rings meshes with a set of planetary gears. 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. The front end of the TE driving bevel gear is integrally provided with a TE driving bevel gear shaft, which extends from the front end of the gearbox housing. The installation distance from the front end face of the TE driving bevel gear shaft to the axis of the end drive shaft is 129mm±5mm, and the installation distance from the center of the TE driving bevel gear to the rear end face of the driven spiral bevel gear is 47mm±5mm.

2. The internal drive gearbox for a tracked tractor as described in claim 1, characterized in that: The sun gear assembly of the planetary reduction mechanism is coaxial with the end drive shaft.

3. The internal drive gearbox for a tracked tractor as described in claim 2, characterized in that: The sun gear assembly includes a large sun gear, a sun gear shaft is integrally connected to the center of the large sun gear, a small end sun gear is provided at the end of the sun gear shaft, the planet gears are arranged around the small end sun gear and mesh with the small end sun gear, and the axles of the planet gears are connected to the planet carrier.

4. The internal drive gearbox for a tracked tractor as described in claim 3, characterized in that: The sun gear shaft has an internal mounting channel. One end of the end drive shaft passes through the mounting 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 connected to the planet carrier through a high and low gear internal gear ring.

5. The internal drive gearbox for a tracked tractor as described in claim 3, 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.

6. The internal drive gearbox for a tracked tractor as described in claim 5, characterized in that: The gearbox has drive shaft holes on both sides to facilitate the passage of the end drive shaft and drive shaft holes to facilitate the passage of the end drive shaft.

7. The internal drive gearbox for a tracked tractor as described in claim 6, characterized in that: An end-drive bearing housing is installed inside the drive shaft hole, and a tapered roller bearing is installed between the end-drive bearing housing and the central sleeve of the pressure cap.

8. The internal drive gearbox for a tracked tractor as described in claim 7, characterized in that: An adjusting nut is installed on the outer side of the end active bearing seat. Multiple slots are distributed in a ring on the outer wall of the adjusting nut. An "L"-shaped locking piece is engaged in the slot. The engaging end of the locking piece is engaged in the slot, and its fixed end is fixed to the gearbox housing by a fastener.

9. The internal drive gearbox for a tracked tractor as described in claim 6, characterized in that: An end drive bearing housing is installed in the drive shaft hole, and a deep groove ball bearing is installed between the end drive bearing housing and the end drive shaft.

10. An internal drive gearbox for a tracked tractor as described in any one of claims 1 to 9, characterized in that: The gearbox housing is also provided with transmission housings on both sides, which cover the outer side of the end drive shaft and the end drive shaft. One end of the end drive shaft extends out of the transmission housing and is connected to a drive wheel. One end of the end drive shaft extends out of the transmission housing and is connected to a brake.

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