Internal drive type gearbox for crawler tractor

Abstract

The invention relates to an internally-driven gearbox for a crawler tractor, which is characterized in that two groups of planetary speed reducing mechanisms are mounted in a gearbox shell, tail end driving shafts are mounted on two sides of the gearbox shell, speed reducing bull gears are further mounted on the tail end driving shafts, and tail end speed reducing gears are arranged at one ends, extending to the outer side of the gearbox, of the tail end driving shafts; 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] The present invention relates to the technical field of tractors, and in particular to an internal drive gearbox for a crawler tractor applied to the tractor. Background Art

[0002] The gearbox is one of the key components of a tractor. The gearbox realizes the conversion of the transmission ratio of the input shaft and the output shaft. The input shaft and the output shaft of the tractor's gearbox are generally realized through five-stage reduction or three-stage reduction. The interior of the gearbox is used to install various levels of reduction gears and connecting shafts, which makes the internal structure of the gearbox complex and bulky, and requires a large installation space, which is not conducive to the lightweight and simplified design of the tractor.

[0003] At present, for small and medium-sized crawler tractors with 30 to 80 horsepower, the planetary reduction mechanism is generally installed on the outside of the gearbox due to its small gearbox. The planetary reduction mechanism drives the transmission mechanism inside the gearbox from the outside. Although this design keeps the size of the gearbox unchanged, it 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 technical development of tractor miniaturization. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an internal drive gearbox for a crawler tractor, which simplifies the transmission mechanism of the gearbox to adapt to the installation and maintenance of a small tractor.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: an internal drive gearbox for a crawler tractor, comprising a gearbox housing, two sets of planetary reduction mechanisms are installed inside the gearbox housing, the planetary reduction mechanisms include a sun gear set, a planetary gear and a planet carrier, the planet carrier is fixedly connected to the terminal driving shaft, one end of the terminal driving shaft extends to the outside of the gearbox, the two sides of the gearbox housing are equipped with a terminal driving shaft, a reduction gear is also installed on the terminal driving shaft, the end of the terminal driving shaft extending to the outside of the gearbox is provided with a terminal reduction gear, the reduction gear is meshed with the terminal reduction gear; the center distance between the terminal reduction gear and the reduction gear is 172mm±5mm, and the center distance between the terminal reduction gear and the reduction gear is 172mm±5mm. 2mm±5mm, the gearbox also includes an internal gear, and two groups of internal teeth are symmetrically arranged on the inner wall of the internal gear, the two groups of planetary reduction mechanisms are installed inside the internal gear, and the internal teeth on the internal gear are respectively meshed with a group of planetary gears, and a driven spiral bevel gear is sleeved on the outer side of the internal gear, and the driven spiral bevel gear is meshed with the TE driving bevel gear, and the front end of the TE driving bevel gear is integrally provided with a TE driving bevel gear shaft, and the TE driving bevel gear shaft extends from the front end of the gearbox housing, and the installation distance from the front end face of the TE driving bevel gear to the axis of the terminal 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 set of the planetary reduction mechanism is coaxial with the terminal driving shaft.

[0007] As a further improvement, the sun gear group includes a large sun gear, a sun gear shaft is integrally connected to the center position of the large sun gear, a terminal small sun gear is provided at the end of the sun gear shaft, the planetary gear is arranged around the terminal small sun gear and meshed with the terminal small sun gear, and the axle of the planetary gear is connected to the planetary carrier.

[0008] As a further improvement, an installation channel is provided inside the sun gear shaft, one end of the terminal driving shaft passes through the installation channel of the sun gear shaft from one end of the large sun gear, and one end of the terminal driving shaft extends out of the sun gear shaft and is connected to the planetary carrier through high and low gear internal gear rings.

[0009] As another improvement, pressure covers are provided on both sides of the internal gear, one end of the planetary carrier is supported on the inner end surface of the pressure cover, a center sleeve coaxial with the sun gear shaft is provided on the pressure cover, the sun gear shaft passes through the center sleeve, and a cylindrical roller bearing is installed between the sun gear shaft and the center sleeve.

[0010] As a preferred technical solution, a driving shaft hole for facilitating the terminal driving shaft to pass through and a driving shaft hole for facilitating the terminal driving shaft to pass through are provided on both side surfaces of the gearbox.

[0011] As a further improvement, a terminal active bearing seat is installed in the active shaft hole, and a tapered roller bearing is installed between the terminal active bearing seat and the central sleeve of the pressure cover.

[0012] As a further improvement, an adjusting nut is installed on the outside of the end active bearing seat, and a plurality of grooves are distributed in an annular manner on the outer wall of the adjusting nut. An "L"-shaped locking plate is clamped in the groove, and the clamping end of the locking plate is clamped in the groove, and the fixed end is fixed to the gearbox housing through a fastener.

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

[0014] As another improvement, transmission housings are provided on both sides of the gearbox housing and cover the outside of the terminal driving shaft and the terminal drive shaft. One end of the terminal drive shaft extends out of the transmission housing and is connected to the drive wheel. One end of the terminal driving 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 the present invention are: 1. The planetary reduction mechanism is installed inside the gearbox and becomes a part of the transmission mechanism inside the gearbox, changing the external drive to internal drive and no longer occupying the installation space outside the gearbox.

[0016] 2. A planetary reduction mechanism and a large reduction gear are installed between the final driving shaft and the final drive shaft to realize the two-stage reduction of the gearbox. Compared with the conventional five-stage reduction gearbox or three-stage reduction gearbox, the transmission mechanism structure is more streamlined and the transmission efficiency is high.

[0017] 3. The volume of the gearbox housing is small, but the sun gear is coaxial with the terminal driving shaft, and the center distance between the terminal reduction gear and the large reduction gear is maintained at 172mm±5mm, which is consistent with the reserved size of the conventional gearbox. It can directly replace the existing 30-80 horsepower small and medium-sized tractor gearbox and has strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 is a schematic structural diagram of an embodiment of the present invention; Figure 2 yes Figure 1 Schematic diagram of the structure of AA; Figure 3 is a schematic diagram of the transmission structure of a gearbox in an embodiment of the present invention; Figure 4 yes Figure 3 A schematic diagram of the structure from another angle; Figure 5 is a schematic structural diagram of a planetary reduction mechanism in an embodiment of the present invention; In the figure: 100-gearbox housing; 101-driving shaft hole; 102-driving shaft hole; 103-end driving bearing seat; 104-end driving bearing seat; 105-transmission housing; 2-end driving shaft; 201-end reduction gear; 3-end driving shaft; 31-reduction large gear; 32-deep groove ball bearing; 41-sun gear set; 41a-large sun gear; 41b-end small sun gear; 41c-sun gear shaft; 42-planetary gear; 43-planet carrier; 44-high and low gear internal gear ring; 5-internal gear; 51-driven spiral bevel gear; 52-TE driving bevel gear; 521-TE driving bevel gear shaft; 53-pressure cover; 54-cylindrical roller bearing; 55-adjusting nut; 56-tapered roller bearing; 57-locking plate; 6-driving wheel; 70-steering hydraulic motor; 71-hydraulic motor output gear; 72-first-stage steering shaft. DETAILED DESCRIPTION

[0020] like Figures 1 to 5 As shown, an internal drive gearbox for a crawler tractor includes a gearbox housing 100, the gearbox housing 100 includes a front box and a rear box, the two are separated by a partition, a terminal driving shaft 2 and a terminal drive shaft 3 are installed inside the gearbox housing 100, and a driving shaft hole 101 for facilitating the passage of the terminal driving shaft and a drive shaft hole 102 for facilitating the passage of the terminal drive shaft are provided on both side surfaces of the gearbox housing, one end of the terminal driving shaft 101 passes through the driving shaft hole, one end of the terminal drive shaft passes through the drive shaft hole 102, and a driving wheel 6 is installed on the terminal drive shaft 3.

[0021] Two sets of planetary reduction mechanisms are installed inside the gearbox housing, and the planetary reduction mechanisms include a sun gear set 41, planetary gears 42 and a planet carrier 43. The sun gear set 41 includes a large sun gear 41a, and a sun gear shaft 41c is integrally connected to the center position of the large sun gear 41a. A terminal small sun gear 41b is provided at the end of the sun gear shaft 41c. The planetary gear 42 is arranged around the terminal small sun gear 41b and meshes with the terminal small sun gear 41b. The wheel shaft of the planetary gear 42 is connected to the planet carrier 43.

[0022] The sun gear set 41 of the planetary reduction mechanism is coaxial with the terminal driving shaft 2 , wherein the large sun gear 41 a is located outside the gearbox housing 100 , and the sun gear shaft 41 c penetrates into the gearbox housing 100 from the driving shaft hole.

[0023] The planet carrier 43 is fixedly connected to the terminal driving shaft 2, and one end of the terminal driving shaft 2 extends to the outside of the gearbox housing 100. Specifically, an installation channel is provided inside the sun gear shaft 41c, and the installation channel passes through the large sun gear 41a, the sun gear shaft 41c and the terminal small sun gear 41b. The terminal driving shaft 2 passes through the installation channel, and one end of the terminal driving shaft 2 passes through the driving shaft hole 101 and the other end passes through the installation channel of the sun gear shaft 41c, extends from the terminal small sun gear 41b, and is fixedly connected to the planet carrier 43 through the high and low gear internal gear ring 44.

[0024] The end drive shaft 3 is installed on both sides of the gearbox housing 100, and a reduction gear 31 is also installed on the end drive shaft 3. The end of the end driving shaft 2 extending to the outside of the gearbox is provided with a end reduction gear 201, and the reduction gear 31 is meshed with the end reduction gear 201; preferably, in order to replace the existing gearbox of 30-80 horsepower small and medium-sized tractors, such as Figure 1 As shown, the center distance between the final driving shaft 2 and the final driving shaft 3, that is, the center distance between the final reduction gear 201 and the reduction gear, is a=172mm±5mm.

[0025] The gearbox also includes an internal gear 5, which is installed inside the gearbox housing 100. Two sets of inner 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 the inner gear rings on the internal gear 5 are each meshed with a set of planetary gears 42. A driven spiral bevel gear 51 is sleeved on the outer side of the internal gear 5, and the driven spiral bevel gear 51 is meshed 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, and the TE driving bevel gear shaft 521 extends from the front end of the gearbox housing 100. Specifically, the TE driving bevel gear 52 is installed in the front box 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 box 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 box to mesh 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 driving bevel gear 52 to the axis of the terminal driving shaft 2 is 129 mm ± 5 mm, and the installation distance b from the central axis of the TE driving bevel gear to the rear end face of the driven spiral bevel gear is 47 mm ± 5 mm.

[0026] A pressure cover 53 is provided on both sides of the internal gear 5. One end of the planet carrier 43 is supported on the inner end surface of the pressure cover 53. A central shaft sleeve coaxial with the sun gear shaft 41c is provided on the pressure cover 53. The sun gear shaft 41c passes through the central shaft sleeve. A cylindrical roller bearing 54 is installed between the sun gear shaft 41c and the central shaft sleeve of the pressure cover 53.

[0027] A terminal active bearing seat 103 is installed in the active shaft hole 101 , and a tapered roller bearing 56 is installed between the terminal active bearing seat 103 and the central sleeve of the gland.

[0028] In order to adjust the position of the internal gear, an adjusting nut 55 is installed on the outer side of the terminal active bearing seat 103. The outer wall of the adjusting nut 55 is annularly provided with a plurality of slots, in which an "L"-shaped locking piece 57 is clamped. The clamping end of the locking piece 57 is clamped in the slot, and its fixed end is fixed to the gearbox housing 100 through a fastener. When the position of the internal gear is adjusted, the clamping end of the locking piece 57 is clamped into the slot, and the fixed end of the locking piece 57 is fixed to the gearbox housing 100.

[0029] A final drive bearing seat 104 is installed in the drive shaft hole 102 , and a deep groove ball bearing 32 is installed between the final drive bearing seat 104 and the final drive shaft 3 .

[0030] Transmission housings 105 are provided on both sides of the gearbox housing 100 and are covered on the outside of the terminal driving shaft 2 and the terminal drive shaft 3. One end of the terminal drive shaft 3 extends out of the transmission housing 105 and is connected to the drive wheel 6. One end of the terminal driving shaft 2 extends out of the transmission housing 105 and is connected to the brake.

[0031] A steering hydraulic motor 70 is installed on one side of the gearbox housing 100, and the output end of the steering hydraulic motor 70 is connected to the 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, and left and right steering gears are installed at both ends of the primary steering shaft 72 respectively.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An internal drive gearbox for a crawler tractor, characterized in that: It comprises a gearbox housing, wherein two sets of planetary reduction mechanisms are installed inside the gearbox housing, wherein the planetary reduction mechanisms comprise a sun gear set, a planetary gear and a planet carrier, wherein the planet carrier is fixedly connected to a terminal driving shaft, wherein one end of the terminal driving shaft extends to the outside of the gearbox, wherein terminal driving shafts are installed on both sides of the gearbox housing, wherein a reduction gear is installed on the terminal driving shaft, wherein a terminal reduction gear is provided at one end of the terminal driving shaft extending to the outside of the gearbox, wherein the reduction gear meshes with the terminal reduction gear; wherein the center distance between the terminal reduction gear and the reduction gear is 172 mm ± 5 mm; The gearbox also includes an internal gear, and two groups of inner gear rings are symmetrically arranged on the inner wall of the internal gear. The two groups of planetary reduction mechanisms are installed inside the internal gear, and the inner gear rings on the internal gear are each meshed with a group of planetary gears. A driven spiral bevel gear is sleeved on the outer side of the internal gear, and the driven spiral bevel gear is meshed with the TE driving bevel gear. A TE driving bevel gear shaft is integrally arranged at the front end of the TE driving bevel gear, and 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 shaft to the axis of the terminal driving 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. An internal drive gearbox for a crawler tractor as claimed in claim 1, characterized in that: The sun gear set of the planetary reduction mechanism is coaxial with the terminal driving shaft.

3. An internal drive gearbox for a crawler tractor as claimed 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 position of the large sun gear, a terminal small sun gear is provided at the end of the sun gear shaft, the planetary gear is arranged around the terminal small sun gear and meshed with the terminal small sun gear, and the axle of the planetary gear is connected to the planet carrier.

4. An internal drive gearbox for a crawler tractor as claimed in claim 3, characterized in that: An installation channel is provided inside the sun gear shaft, one end of the terminal driving shaft passes through the installation channel of the sun gear shaft from one end of the large sun gear, and one end of the terminal driving shaft extends out of the sun gear shaft and is connected to the planet carrier through a high and low gear internal gear ring.

5. The internal drive gearbox for a crawler tractor according to claim 3, characterized in that: A pressure cover is provided on both sides of the internal gear, one end of the planet carrier is supported on the inner end surface of the pressure cover, a center sleeve coaxial with the sun gear shaft is provided on the pressure cover, the sun gear shaft passes through the center sleeve, and a cylindrical roller bearing is installed between the sun gear shaft and the center sleeve.

6. An internal drive gearbox for a crawler tractor as claimed in claim 3, characterized in that: The two side surfaces of the gearbox are provided with a driving shaft hole for the terminal driving shaft to pass through and a driving shaft hole for the terminal driving shaft to pass through.

7. An internal drive gearbox for a crawler tractor as claimed in claim 6, characterized in that: A terminal active bearing seat is installed in the active shaft hole, and a tapered roller bearing is installed between the terminal active bearing seat and the central sleeve of the gland.

8. An internal drive gearbox for a crawler tractor as claimed in claim 7, characterized in that: An adjusting nut is installed on the outer side of the terminal active bearing seat, and a plurality of grooves are distributed in an annular manner on the outer wall of the adjusting nut. An "L"-shaped locking plate is clamped in the groove. The clamping end of the locking plate is clamped in the groove, and the fixed end is fixed to the gearbox housing through a fastener.

9. A high-efficiency transmission gearbox as claimed in claim 6, characterized in that: A terminal drive bearing seat is installed in the driving shaft hole, and a deep groove ball bearing is installed between the terminal drive bearing seat and the terminal drive shaft.

10. A high-efficiency transmission gearbox according to any one of claims 1 to 9, characterized in that: Transmission housings are also provided on both sides of the gearbox housing, covering the outside of the terminal driving shaft and the terminal drive shaft. One end of the terminal drive shaft extends out of the transmission housing and is connected to the drive wheel. One end of the terminal driving shaft extends out of the transmission housing and is connected to the brake.

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