Transfer case and tractor

Abstract

The utility model provides a transfer case and a tractor. Comprising a transfer case shell, a power output shaft, a driven gear, a clutch and a separation cover, lubricating media are contained in the transfer case shell, the power output shaft is installed in the transfer case shell, the driven gear is sleeved on the power output shaft in an empty mode, the clutch is arranged on the power output shaft, and the separation cover is fixedly installed in the transfer case shell. The separation cover can separate the lubricating medium around the driven gear and the clutch from the lubricating medium in the transfer case shell. According to the transfer case, the separation cover is arranged in the transfer case shell, lubricating media around the driven gear and the clutch are separated from lubricating media in the transfer case shell, the lubricating media in the separation cover are relatively independent, the influence of the gear and the clutch on the lubricating media in the whole transfer case is reduced, oil stirring loss is further reduced, and the service life of the transfer case is prolonged. And the transmission efficiency and reliability of the transfer case and the gearbox are improved.

Description

Technical Field

[0001] The utility model relates to the field of agricultural machinery, in particular to a transfer case and a tractor. Background Art

[0002] In related technologies, tractors use a clutch to transmit and disconnect power, achieving electro-hydraulic control of the transfer case. The transfer case gears are located at the bottom of the transmission and are immersed in the transmission lubricant. When the clutch and gears operate at high speeds, they stir the oil in the transfer case, causing oil churning losses. This lost power is converted into heat, causing the oil to heat up. Overheating the oil can affect the transmission efficiency and reliability of the transfer case and transmission. Therefore, it is necessary to provide a transfer case and tractor that overcome the aforementioned drawbacks. Utility Model Content

[0003] The purpose of the utility model is to provide a transfer case and a tractor.

[0004] According to one aspect of the present invention, a transfer case is provided, comprising: a transfer case housing, wherein a lubricating medium is contained in the transfer case housing; a power output shaft, wherein the power output shaft is mounted in the transfer case housing, and one end of the power output shaft passes through the transfer case housing to transmit power to the outside of the transfer case; a driven gear, wherein the driven gear is loosely sleeved on the power output shaft, the driven gear is transmission-connected to the gearbox, and transmits the gearbox power to the driven wheel gear; a clutch, wherein the clutch is arranged on the power output shaft and adjacent to the driven gear, and the clutch selectively connects or disconnects the driven gear from the power output shaft; a separator cover, wherein the separator cover is mounted in the transfer case housing and covers the outside of the driven gear and the clutch, and the separator cover separates the lubricating medium around the driven gear and the clutch from the lubricating medium inside the transfer case housing.

[0005] Preferably, the separation cover includes a first slot body and a second slot body formed integrally, the first slot body is used to accommodate the clutch, the second slot body is used to accommodate the driven gear, and notches are provided on both sides of the separation cover to allow the power output shaft to pass through.

[0006] Preferably, the first trough body and the second trough body are both U-shaped troughs.

[0007] Preferably, the transfer case housing includes an upper housing, the upper housing is integrally formed with the gearbox, and the upper housing is provided with an accommodating hole for accommodating the power output shaft to pass through.

[0008] Preferably, the transfer case housing includes a lower housing connected to the upper housing, a mounting platform is provided inside the lower housing, and a supporting portion is provided on the outer circumference of the partition cover, and the supporting portion is fixedly connected to the mounting platform.

[0009] Preferably, the lubricating medium level in the transfer case housing at least submerges the notch.

[0010] Preferably, a first bearing and a second bearing are provided in the transfer case housing, the first bearing and the second bearing are sleeved on the power output shaft, the second bearing is provided in the accommodating hole, and an oil seal is provided on the outside of the second bearing.

[0011] Preferably, the clutch includes: a connecting portion, the connecting portion is formed on the inner ring of the driven gear, the connecting portion is sleeved on the power output shaft through a third bearing and a fourth bearing; a driving hub, the driving hub is provided on the side of the driven gear close to the accommodating hole and rotates synchronously with the driven gear; a driven hub, the driven hub is provided on the power output shaft; a friction plate assembly, the friction plate assembly is provided between the driving hub and the driven hub, the driving hub power is transmitted to the driven hub when the friction plate assembly is engaged, and the transmission connection between the driving hub and the driven hub is disconnected when the friction plate assembly is separated; a piston The piston is sleeved on the connecting part and is located on the side of the driven gear away from the accommodating hole. The piston and the driven gear form an oil cylinder cavity, so that the piston can slide axially; the push rod part is arranged along the axial direction of the piston and extends through the driven gear to contact the friction plate assembly; the elastic element pushes the piston and the push rod part to move toward the side close to the friction assembly or maintains the trend of the piston and the push rod part moving toward the side close to the friction assembly; the hydraulic oil channel is arranged on the power output shaft, and the hydraulic oil channel is connected to the oil cylinder cavity.

[0012] Preferably, an oil hole is provided in the circumference of the driving hub.

[0013] According to another aspect of the present invention, a tractor is provided, comprising the transfer case described above.

[0014] Compared with the prior art, the transfer case and tractor provided by the present invention have the following beneficial effects: the present invention separates the lubricating medium around the driven gear and the clutch from the lubricating medium inside the transfer case housing by arranging a partition cover inside the transfer case housing, so that the lubricating medium inside the partition cover is relatively independent, thereby reducing the influence of the gears and the clutch on the lubricating medium in the entire transfer case, thereby reducing oil churning losses and improving the transmission efficiency and reliability of the transfer case and gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0016] Figure 1 It is a distribution diagram of the transfer case in the present utility model.

[0017] Figure 2 It is a structural schematic diagram of the transfer case in the present utility model.

[0018] Figure 3 It is a cross-sectional schematic diagram of the transfer case in the present invention.

[0019] Figure 4 It is a partial enlarged view of the clutch in the present utility model.

[0020] The accompanying drawings are:

[0021] 100, transfer case; 200, gearbox;

[0022] 1. Transfer case housing; 11. Upper housing; 111. Receiving hole; 12. Lower housing; 121. Mounting platform;

[0023] 2. Power take-off shaft; 21. First bearing; 22. Second bearing; 23. Oil seal; 24. Hydraulic oil passage; 241. First oil passage; 242. Second oil passage; 243. Third oil passage;

[0024] 3. Driven gear; 31. Connecting portion; 32. Third bearing; 33. Fourth bearing;

[0025] 4. Clutch; 41. Driving hub; 411. Oil hole; 42. Driven hub; 43. Friction plate assembly; 44. Piston; 45. Cylinder chamber; 441. Push rod; 46. Elastic element;

[0026] 5. Separation cover; 51. First trough body; 52. Second trough body; 53. Notch; 54. Support portion. DETAILED DESCRIPTION

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0028] To simplify the drawings, only the parts relevant to the present invention are schematically shown in each figure. They do not represent the actual structure of the product. In addition, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one."

[0029] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0030] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0031] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0033] See Figures 1 to 4 This embodiment provides a transfer case 100, which is part of a transmission system for agricultural machinery such as a tractor. Specifically, the transfer case 100 may be part of a transmission 200 and located below the transmission 200, or may be a separate unit installed below the transmission 200. In this embodiment, the transfer case 100 includes a transfer case housing 1, a power output shaft 2, a driven gear 3, a clutch 4, and a partition cover 5.

[0034] See Figure 1 The transfer case housing 1 includes an upper housing 11 and a lower housing 12. The upper housing 11 is integrally formed with the gearbox 200 housing. The upper housing 11 is provided with a receiving hole 111 for accommodating the power output shaft 2. The lower housing 12 is connected to the upper housing 11. Several mounting platforms 121 are provided inside the lower housing 12 for mounting the partition cover 5.

[0035] See Figure 3The power take-off shaft 2 is mounted within the transfer case housing 1. Specifically, a first bearing 21 and a second bearing 22 are provided within the transfer case housing 1. These first and second bearings 21 and 22 are sleeved onto the power take-off shaft 2. The second bearing 22 is positioned within a receiving hole 111. An oil seal 23 is provided on the outer side of the second bearing 22. One end of the power take-off shaft 2 passes through the transfer case housing 1 through the receiving hole 111, transmitting power to the outside of the transfer case. A spline is provided at one end of the power take-off shaft 2, which connects to the drive shaft through the spline and coupling to transmit power to the front axle.

[0036] The driven gear 3 is loosely mounted on the power output shaft 2 and can rotate relative to the power output shaft 2. The clutch 4 is arranged on the power output shaft 2 and adjacent to the driven gear 3. The clutch 4 selectively connects or disconnects the driven gear 3 from the power output shaft 2. Figure 3 The inner ring of the driven gear 3 forms a connecting portion 31, which is mounted on the power output shaft 2 via a third bearing 32 and a fourth bearing 33. The driven gear 3 and the transmission 200 are meshed and driven by a gear or gear set, transmitting the power of the transmission 200 to the driven gear. A driving hub 41 is provided on the side of the driven gear 3 near the receiving hole 111. A driven hub 42 is provided on the power output shaft 2. A friction plate assembly 43 is provided between the driving hub 41 and the driven hub 42. When the friction plate assembly 43 is engaged, the power of the driving hub 41 is transmitted to the driven hub 42. When the friction plate assembly 43 is disengaged, the transmission connection between the driving hub 41 and the driven hub 42 is disconnected. In addition, a plurality of oil holes 411 are provided on the circumference of the driving hub 41. Lubricating medium can enter the friction plate assembly 43 through the oil holes 411 to achieve lubrication and heat dissipation of the friction plate assembly 43.

[0037] See Figure 2 A support portion 54 is provided on the outer circumference of the separator cover 5. The support portion 54 is fixedly connected to the mounting platform 121, securing the separator cover 5 within the transfer case housing 1 and positioned over the driven gear 3 and clutch 4. Specifically, the separator cover 5 comprises an integrally formed first groove 51 and a second groove 52. The first groove 51 accommodates the clutch 4, and the second groove 52 accommodates the driven gear 3. Both the first groove 51 and the second groove 52 are U-shaped grooves, which minimize the clearance between the inner wall of the separator cover 5 and the clutch 4 and driven gear 3. In other words, the separator cover 5 isolates the lubricating medium surrounding the driven gear 3 and clutch 4 from the lubricating medium within the transfer case housing 1. Notches 53 are provided on both sides of the separator cover 5 to allow the power take-off shaft 2 to pass through. The lubricating medium level within the transfer case housing 1 at least covers the notches 53, allowing the lubricating medium to enter the separator cover 5 through the notches 53, lubricating the friction plate assembly 43 and dissipating heat. The lubricating medium in the partition cover 5 is relatively independent, has little influence on the lubricating medium in the entire transfer case housing 1, and the oil stirring loss is relatively smaller.

[0038] See Figure 3 、 Figure 4 A piston 44 is provided on the side of the driven gear 3 away from the receiving hole 111. The piston 44 is sleeved on the connecting portion 31 and slides axially. The piston 44 and the driven gear 3 form a cylinder cavity 45. The piston 44 is axially provided with multiple push rods 441. The push rods 441 extend through the driven gear 3 and contact the friction plate assembly 43. An elastic element 46 is provided on the side of the piston 44 away from the driven gear 3. The elastic element 46 is a spring diaphragm that can push the piston 44 and the push rods 441 toward the side of the friction plate assembly 43 or maintain the tendency of the piston 44 and the push rods 441 to move toward the side of the friction plate assembly 43.

[0039] The power output shaft 2 is provided with a hydraulic oil passage 24 and a lubricating oil passage. The hydraulic oil passage 24 drives the piston 44 to move axially, and the lubricating oil passage is used to lubricate the third bearing 32 and the fourth bearing 33. Figure 3 、 Figure 4 Hydraulic oil passage 24 includes a first oil passage 241 provided on upper housing 11, a second oil passage 242 provided on power take-off shaft 2 and connected to first oil passage 241, and a third oil passage 243 provided on connecting portion 31 and connected to second oil passage 242. Hydraulic oil sequentially passes through first oil passage 241, second oil passage 242, and third oil passage 243 and enters cylinder chamber 45, causing piston 44 and push rod 441 to move in opposite directions, disengaging friction plate assembly 43 and achieving transmission connection or disconnection between driving hub 41 and driven hub 42.

[0040] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments described above without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations of the present invention that fall within the scope of the appended claims and their equivalents.

Claims

1. A transfer case, characterized in that: include: a transfer case housing, wherein a lubricating medium is contained in the transfer case housing; a power output shaft, the power output shaft being mounted in the transfer case housing, and one end of the power output shaft passing through the transfer case housing to transmit power to the outside of the transfer case; A driven gear, the driven gear being loosely mounted on the power output shaft and being in transmission connection with the gearbox to transmit the gearbox power to the driven gear; a clutch, the clutch being disposed on the power output shaft and adjacent to the driven gear, the clutch selectively connecting or disconnecting the driven gear from the power output shaft; A separation cover is installed in the transfer case housing and is arranged outside the driven gear and the clutch. The separation cover separates the lubricating medium around the driven gear and the clutch from the lubricating medium inside the transfer case housing.

2. The transfer case according to claim 1, wherein: The separation cover includes a first slot body and a second slot body formed in one piece, the first slot body is used to accommodate the clutch, the second slot body is used to accommodate the driven gear, and notches are provided on two side surfaces of the separation cover to allow the power output shaft to pass through.

3. The transfer case according to claim 2, wherein: The first trough body and the second trough body are both U-shaped troughs.

4. The transfer case according to claim 3, wherein: The transfer case housing includes an upper housing, which is integrally formed with the gearbox. The upper housing is provided with an accommodating hole for accommodating the power output shaft to pass through.

5. The transfer case according to claim 4, characterized in that: The transfer case housing includes a lower housing connected to the upper housing, a mounting platform is provided inside the lower housing, and a supporting portion is provided on the outer circumference of the partition cover, and the supporting portion is fixedly connected to the mounting platform.

6. The transfer case according to claim 5, characterized in that The lubricating medium liquid level in the transfer case housing at least submerges the notch.

7. The transfer case according to claim 6, characterized in that A first bearing and a second bearing are provided in the transfer case housing. The first bearing and the second bearing are sleeved on the power output shaft. The second bearing is provided in the accommodating hole, and an oil seal is provided on the outer side of the second bearing.

8. The transfer case according to claim 7, wherein: The clutch comprises: A connecting portion, the connecting portion being formed on the inner ring of the driven gear and being sleeved on the power output shaft via a third bearing and a fourth bearing; A driving hub, which is provided on a side of the driven gear close to the receiving hole and rotates synchronously with the driven gear; A driven hub, the driven hub being arranged on the power output shaft; A friction plate assembly is provided between the driving hub and the driven hub. When the friction plate assembly is engaged, the driving hub transmits power to the driven hub. When the friction plate assembly is disengaged, the transmission connection between the driving hub and the driven hub is disconnected. A piston is sleeved on the connecting portion and is located on a side of the driven gear away from the receiving hole, wherein the piston and the driven gear form an oil cylinder cavity so that the piston can slide in the axial direction; a push rod portion, the push rod portion being arranged along the axial direction of the piston and extending through the driven gear to contact the friction plate assembly; an elastic element, wherein the elastic element pushes the piston and the push rod portion to move toward a side close to the friction assembly or maintains a tendency for the piston and the push rod portion to move toward a side close to the friction assembly; A hydraulic oil passage is provided on the power output shaft and is connected to the oil cylinder chamber.

9. The transfer case according to claim 8, characterized in that The driving hub is provided with oil holes in the circumference thereof.

10. A tractor, characterized in that: The transfer case comprises the transfer case according to any one of claims 1 to 9.

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