Overhead four-wheel drive transfer case of self-propelled harvester

Abstract

The utility model provides an overhead four-wheel drive transfer case of a self-propelled harvester, and belongs to the technical field of self-propelled harvesting machinery. The transfer case comprises a transfer case shell connected with the upper portion of a gearbox, an input shaft is horizontally arranged in the transfer case shell, the right end of the input shaft is rotationally connected with a gear seat, the outer wall of the gear seat is in meshed connection with a transmission gear, the middle of the input shaft is in meshed connection with a gear hub, and a driving bevel gear rotating coaxially is fixed to the left end of the input shaft. The driving bevel gear is connected with an output bevel gear in a meshed mode, a bevel gear output shaft which is perpendicular and extends backwards is coaxially fixed to the output bevel gear, a fork shaft is arranged on the upper portion in the transfer case shell, a shifting fork is fixed to the fork shaft, and a gear hub sleeve meshed with the outer wall of the gear hub is fixed to the end of the shifting fork. A gear ring meshed with the inner wall of the gear hub sleeve is arranged at the end of the gear seat, when the fork shaft drives the shifting fork to move rightwards, the gear hub sleeve is meshed with the gear hub and the gear ring, and the input shaft drives the gear seat and the transmission gear to rotate. The sealing device is compact in structure, independently sealed and lubricated, long in service life and convenient to operate.

Description

Technical Field

[0001] The utility model belongs to the technical field of self-propelled harvesting machinery, and particularly refers to an upper-mounted four-wheel drive transfer case for a self-propelled harvester. Background Art

[0002] In recent years, with the development of various agricultural harvesting machinery towards large-scale, the weight of the whole machine has been increasing continuously. Most of the existing self-propelled harvesters are front-wheel drive. Therefore, when harvesting, there is a phenomenon of poor driving force when relying only on the front-wheel drive. When harvesting in relatively soft fields, the driving wheels will sink into pits and slip. Summary of the Invention

[0003] The purpose of the utility model is to provide an upper-mounted four-wheel drive transfer case for a self-propelled harvester, which has a compact structure, the transfer case is separately sealed and lubricated, has a long service life, and is convenient to switch between front-wheel drive and four-wheel drive, and is easy to operate.

[0004] The purpose of the utility model is realized as follows:

[0005] An upper-mounted four-wheel drive transfer case for a self-propelled harvester includes a transfer case housing connected to the upper part of the gearbox. A transmission shaft is horizontally arranged in the transfer case housing. The right end of the transmission shaft is rotatably connected to a gear seat. The outer wall of the gear seat is meshed with a transmission gear. The middle part of the transmission shaft is meshed with a gear hub. The left end of the transmission shaft is fixed with a coaxial rotating driving bevel gear. The driving bevel gear is meshed with a driven bevel gear. The driven bevel gear is coaxially fixed with a bevel gear output shaft that is perpendicular and extends backward. Above the transfer case housing, there is a fork shaft. A shift fork is fixed on the fork shaft. The end of the shift fork is fixed with a gear hub sleeve that meshes with the outer wall of the gear hub. The end of the gear seat is provided with a gear ring that meshes with the inner wall of the gear hub sleeve. When the fork shaft drives the shift fork to move to the right, the gear hub sleeve meshes with the gear hub and the gear ring, and the transmission shaft drives the gear seat and the transmission gear to rotate.

[0006] The utility model is further arranged such that the right end of the fork shaft is provided with a first self-locking groove and a second self-locking groove. The surface of the transfer case housing is provided with a self-locking hole. A steel ball that abuts against a self-locking spring at one end is assembled in the self-locking hole. The end of the fork shaft is fixed with a bracket that extends out of the transfer case housing. When the bracket drives the fork shaft to axially move, the bottom of the steel ball slides from the first self-locking groove to the second self-locking groove.

[0007] The utility model is further arranged such that the bottom of the transfer case housing is connected to the upper end of the gearbox. The right side of the transfer case housing is communicated with the upper end of the gearbox. The upper end of the transfer case housing is covered with an upper cover. The upper cover and the left end of the transfer case housing form a sealed transfer case sealing cavity.

[0008] The utility model is further arranged such that both the first self-locking groove and the second self-locking groove are arc-shaped annular grooves that fit with the bottom surface of the steel ball.

[0009] The prominent and beneficial technical effects of the present utility model compared with the prior art are as follows:

[0010] The self-propelled harvester of the present utility model is provided with an upper-mounted four-wheel drive transfer case, which is convenient to install on the upper end of the gearbox. The upper-mounted four-wheel drive transfer case is separately sealed and lubricated, and the shift fork is convenient to switch, realizing drive conversion, and the power connection and disconnection operations are convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is the overall structure diagram of the present utility model;

[0012] Figure 2 is the partial sectional structure schematic diagram of the fork shaft of the present utility model;

[0013] Figure 3 is the structure schematic diagram of the transfer case housing forming two opposite chambers of the present utility model;

[0014] Figure 4 is the transmission principle diagram of the present utility model

[0015] Reference Signs:

[0016] 1 - transfer case housing; 10 - self-locking hole;

[0017] 2 - input shaft;

[0018] 3 - gear seat; 30 - conduction gear; 31 - gear ring;

[0019] 4 - gear hub;

[0020] 5 - driving bevel gear; 50 - output bevel gear;

[0021] 6 - fork shaft; 60 - shift fork; 61 - gear hub sleeve; 62 - first self-locking groove; 63 - second self-locking groove; 64 - bracket; 7 - steel ball; 70 - self-locking spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present utility model will be further described below with reference to the accompanying drawings in specific embodiments. Refer to Figure 1 — Figure 4 :

[0023] An upper-mounted four-wheel drive transfer case for a self-propelled harvester, comprising a transfer case housing 1 connected to the upper part of a gearbox. A drive shaft 2 is horizontally arranged inside the transfer case housing 1. The right end of the drive shaft 2 is rotatably connected to a gear seat 3. A conduction gear 30 is meshed and connected to the outer wall of the gear seat 3. A gear hub 4 is meshed and connected to the middle part of the drive shaft 2. A driving bevel gear 5 that rotates coaxially is fixed to the left end of the drive shaft 2. An output bevel gear 50 is meshed and connected to the driving bevel gear 5. A bevel gear output shaft 51 that is perpendicular and extends backward is coaxially fixed to the output bevel gear 50. A fork shaft 6 is arranged above the inside of the transfer case housing 1. A fork 60 is fixed to the fork shaft 6. A gear hub sleeve 61 that meshes with the outer wall of the gear hub 4 is fixed to the end of the fork 60. A gear ring 31 that meshes with the inner wall of the gear hub sleeve 61 is arranged at the end of the gear seat 3. When the fork shaft 6 drives the fork 60 to move rightward, the gear hub sleeve 61 meshes with the gear hub 4 and the gear ring 31, and the drive shaft 2 drives the gear seat 3 and the conduction gear 30 to rotate.

[0024] Preferably, a first self-locking groove 62 and a second self-locking groove 63 are formed at the right end of the fork shaft 6. A self-locking hole 10 is formed on the surface of the transfer case housing 1. A steel ball 7 that abuts against a self-locking spring 70 at one end is assembled in the self-locking hole 10. A bracket 64 that extends out of the transfer case housing 1 is fixed to the end of the fork shaft 6. When the bracket 64 drives the fork shaft 6 to axially move, the bottom of the steel ball 7 slides from the first self-locking groove 62 to the second self-locking groove 63.

[0025] Preferably, the bottom of the transfer case housing 1 is connected to the upper end of the gearbox, and the right side of the transfer case housing 1 is communicated with the upper end of the gearbox. An upper cover 11 is arranged on the upper end of the transfer case housing 1. A sealed transfer case sealing cavity is formed between the upper cover 11 and the left end of the transfer case housing 1. The structure of the transfer case sealing cavity is more compact, and it is independently sealed and lubricated, ensuring a good service life.

[0026] Preferably, both the first self-locking groove 62 and the second self-locking groove 63 are arc-shaped ring grooves that fit with the bottom surface of the steel ball 7.

[0027] In the specific implementation process,

[0028] Refer to Figure 2 、 Figure 3 and Figure 4

[0029] The conduction gear 30 meshes with the differential gear of the gearbox on the right side of the transfer case housing 1. When the input power drives the driving bevel gear 5 to rotate, the output bevel gear 50 that meshes with it drives the bevel gear output shaft 51 to output power. At this time, the fork 60 is driven to make the gear hub sleeve 61 only mesh with the gear hub 4, and there is no power for four-wheel output;

[0030] When the shift fork 60 moves, the gear hub sleeve 61 meshes with the gear hub and the gear ring 31 at the same time, enabling the input shaft to drive the gear seat 3, and the gear seat drives the conduction gear 30 to rotate, thereby realizing four-wheel output drive.

[0031] The above embodiments are only preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. An upper-mounted four-wheel drive transfer case for a self-propelled harvester, characterized in that, It includes a transfer case housing (1) connected to the upper part of the gearbox. A transmission input shaft (2) is horizontally arranged inside the transfer case housing (1). The right end of the transmission input shaft (2) is rotatably connected to a gear seat (3). A conduction gear (30) is meshed with the outer wall of the gear seat (3). A gear hub (4) is meshed with the middle part of the transmission input shaft (2). The left end of the transmission input shaft (2) is fixed with a driving bevel gear (5) that rotates coaxially. An output bevel gear (50) is meshed with the driving bevel gear (5). The output bevel gear (50) is coaxially fixed with a bevel gear output shaft (51) that is perpendicular and extends backward. A fork shaft (6) is arranged above the inside of the transfer case housing (1). A shift fork (60) is fixed on the fork shaft (6). A gear hub sleeve (61) that meshes with the outer wall of the gear hub (4) is fixed at the end of the shift fork (60). A gear ring (31) that meshes with the inner wall of the gear hub sleeve (61) is arranged at the end of the gear seat (3). When the fork shaft (6) drives the shift fork (60) to move rightward, the gear hub sleeve (61) meshes with the gear hub (4) and the gear ring (31), and the transmission input shaft (2) drives the gear seat (3) and the conduction gear (30) to rotate.

2. The upper-mounted four-wheel drive transfer case for a self-propelled harvester according to claim 1, wherein A first self-locking groove (62) and a second self-locking groove (63) are formed at the right end of the fork shaft (6). A self-locking hole (10) is formed on the surface of the transfer case housing (1). A steel ball (7) that abuts against a self-locking spring (70) at one end is assembled in the self-locking hole (10). A bracket (64) that extends out of the transfer case housing (1) is fixed at the end of the fork shaft (6). When the bracket (64) drives the fork shaft (6) to axially move, the bottom of the steel ball (7) slides from the first self-locking groove (62) to the second self-locking groove (63).

3. A four-wheel drive transfer case mounted on top of a self-propelled harvester according to claim 1, characterized in that, The bottom of the transfer case housing (1) is connected to the upper end of the gearbox, and the right side of the transfer case housing (1) is communicated with the upper end of the gearbox. An upper cover (11) is arranged on the upper end of the transfer case housing (1). A sealed transfer case sealing cavity is formed between the upper cover (11) and the left end of the transfer case housing (1).

4. The upper-mounted four-wheel drive transfer case for a self-propelled harvester according to claim 2, characterized in that, Both the first self-locking groove (62) and the second self-locking groove (63) are arc-shaped ring grooves that fit with the bottom surface of the steel ball (7).

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