Four-wheel drive gearbox for agricultural vehicle

Abstract

The four-wheel-drive gearbox for the agricultural vehicle comprises a shell, an input shaft, a middle shaft, a front output shaft and a rear output shaft, the input shaft penetrates through the shell, one end of the front output shaft and one end of the rear output shaft are inserted into the shell, and the front output shaft and the rear output shaft are located on the same straight line; the middle shaft is arranged between the rear output shaft and the input shaft; a first gear and a second gear are fixedly mounted on the input shaft; a third gear, a fourth gear and a fifth gear are arranged on the intermediate shaft, the fifth gear is fixedly connected with the intermediate shaft, the third gear and the fourth gear are connected with the intermediate shaft through bearings, the third gear is meshed with the first gear, and the fourth gear is meshed with the second gear. According to the gearbox, the first gear hub is arranged on the rear output shaft, the front output shaft and the rear output shaft are kept coaxial through the inner hole of the first gear hub, friction between the front output shaft and the rear output shaft can be reduced in the two-drive mode, and the service life of the gearbox is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of spare parts for agricultural vehicles, and in particular to a four-wheel drive gearbox for agricultural vehicles. Background Art

[0002] When agricultural vehicles are used, when towing working equipment in the field, greater traction is required. In order to have better grip, the vehicle is switched to four-wheel drive mode. When on paved roads or lightly loaded, in order to increase driving speed and save fuel, it is switched to two-wheel drive mode. The two-wheel drive mode and the four-wheel drive mode are mainly switched through a gearbox. For example, Chinese patent application number 202322698219.0 discloses a new four-wheel drive wheel type travel transmission mechanism, including a main gearbox, both sides of the main gearbox are provided with a gearbox output shaft, and one side of the main gearbox is provided with a gearbox input shaft. The mechanism connects the front and rear axles through the gearbox, and the outputs on both sides of the gearbox are on the same straight line. The front and rear input shafts are hard-connected in the four-wheel drive mode, and in the two-wheel drive mode, the power of the engine is mainly connected to the rear axle output shaft. When the vehicle is driving in the two-wheel drive mode, the front and rear axles will have asynchronous rotation speeds. The current gearbox does not have a bearing between the two shafts, so that the output shafts rub against each other and wear quickly, resulting in a short service life of the gearbox. Utility Model Content

[0003] In order to solve the above problems, the present application proposes a four-wheel drive gearbox for agricultural vehicles, which reduces the friction of the front and rear output shafts by arranging bearings between the front and rear output shafts, thereby reducing the grinding speed and increasing the service life of the gearbox.

[0004] This application is implemented through the following technical solutions:

[0005] The present application proposes a four-wheel drive gearbox for agricultural vehicles, comprising: a housing, an input shaft, an intermediate shaft, a front output shaft, and a rear output shaft, wherein the input shaft passes through the housing, one end of the front output shaft and the rear output shaft are respectively inserted into the housing, and the front output shaft and the rear output shaft are on the same straight line; the intermediate shaft is arranged between the rear output shaft and the input shaft; a first gear and a second gear are fixedly mounted on the input shaft; a third gear, a fourth gear, and a fifth gear are arranged on the intermediate shaft, the fifth gear is fixedly connected to the intermediate shaft, the third gear and the fourth gear are connected to the intermediate shaft through bearings, and the third gear is meshed with the first gear, and the fourth gear is meshed with the second gear; a sixth gear and a first gear hub are fixedly mounted on the rear output shaft, the sixth gear is meshed with the fifth gear, one side of the inner hole of the first gear hub is fixedly connected to the rear output shaft, a bearing is arranged on the other side of the inner hole of the first gear hub, and one end of the front output shaft is inserted into the inner hole of the first gear hub.

[0006] Furthermore, a second gear hub is provided between the third gear and the fourth gear, the second gear hub is fixedly connected to the intermediate shaft, a first gear sleeve is provided on the first gear hub, and a second gear sleeve is provided on the second gear hub.

[0007] Furthermore, a connecting gear is provided on the front output shaft, and the connecting gear is connected to the first gear hub through a first gear sleeve.

[0008] Furthermore, key teeth are provided on one side of the third gear and one side of the fourth gear, and the third gear and the fourth gear are respectively connected to the second gear sleeve through the key teeth.

[0009] Furthermore, the first gear sleeve and the second gear sleeve are respectively provided with a shift fork, a connecting rod is provided outside the housing, and the shift fork is connected to a gear lever of the vehicle through the connecting rod.

[0010] Furthermore, one end of the input shaft is connected to the internal combustion engine of the vehicle, and the other end of the input shaft is provided with a pulley.

[0011] Furthermore, a refueling hole is provided at the upper portion of the shell, an oil drain hole is provided at the lower portion of the shell, and sealing nuts are provided on the refueling hole and the oil drain hole.

[0012] The beneficial effects of the present application are as follows: by arranging a first gear hub on the rear output shaft, the inner hole of the first gear hub is utilized to ensure that the front output shaft and the rear output shaft remain coaxial and the friction between the front output shaft and the rear output shaft can be reduced in the two-wheel drive mode, thereby increasing the service life of the gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the installation of the utility model on a vehicle;

[0015] Figure 3 It is a structural schematic diagram of the connection relationship of each axis of the utility model;

[0016] Figure 4 This is a schematic diagram of the structure of the input shaft of the utility model;

[0017] Figure 5 This is a schematic diagram of the structure of the intermediate shaft of the utility model;

[0018] Figure 6 It is a schematic diagram of the structure of the front output shaft and the rear output shaft;

[0019] Figure 7 It is a schematic diagram of the internal structure of the front output shaft and the rear output shaft;

[0020] In the figure: 1-housing, 2-input shaft, 3-intermediate shaft, 4-front output shaft, 5-rear output shaft, 6-shift fork, 7-connecting rod, 11-fuel filling hole, 12-oil drain hole, 21-first gear, 22-second gear, 23-pulley, 31-third gear, 32-fourth gear, 33-fifth gear, 34-second gear hub, 35-second gear sleeve, 36-key tooth, 41-connecting gear, 51-sixth gear, 52-first gear hub, 53-first gear sleeve. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] In addition, the descriptions of "first", "second", etc. in this application are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0024] like Figures 1 to 7As shown, an embodiment of the utility model provides a four-wheel drive gearbox for agricultural vehicles, comprising: a housing 1, an input shaft 2, an intermediate shaft 3, a front output shaft 4, and a rear output shaft 5, wherein the input shaft 2 passes through the housing 1, and one end of the front output shaft 4 and the rear output shaft 5 are respectively inserted into the housing 1, and the front output shaft 4 and the rear output shaft 5 are on the same straight line; the intermediate shaft 3 is arranged between the rear output shaft 5 and the input shaft 2; a first gear 21 and a second gear 22 are fixedly mounted on the input shaft 2; a third gear 31, a fourth gear 32, a first gear 33 and a second gear 34 are arranged on the intermediate shaft 3. The fifth gear 33 is fixedly connected to the intermediate shaft 3, the third gear 31 and the fourth gear 32 are connected to the intermediate shaft 3 through bearings, and the third gear 31 is meshed with the first gear 21, and the fourth gear 32 is meshed with the second gear 22; the sixth gear 51 and the first gear hub 52 are fixedly installed on the rear output shaft 5, the sixth gear 51 is meshed with the fifth gear 33, one side of the inner hole of the first gear hub 52 is fixedly connected to the rear output shaft 5, and a bearing is provided on the other side of the inner hole of the first gear hub 52, and one end of the front output shaft 4 is inserted into the inner hole of the first gear hub 52.

[0025] like Figure 2 As shown, the input shaft 2 is connected to the crankshaft of the internal combustion engine of the vehicle, and the power of the internal combustion engine is sent to the gearbox through the input shaft 2. Driven by the input shaft 2, the first gear 21 and the second gear 22 rotate synchronously, and the third gear 31 is driven by the first gear 21, and the fourth gear 32 is driven by the second gear 22. The driver drives the shift fork 6 to slide through the connecting rod 7, thereby driving the second gear sleeve 35 to slide. After the second gear sleeve 35 slides, the key tooth 36 can be clamped by the groove inside the second gear sleeve 35, so as to realize the synchronous rotation of the second gear hub 34 and the third gear 31 or the second gear hub 34 and the fourth gear 32. The third gear 31 and the fourth gear 32 have different numbers of teeth and different rotation speeds. Through the sliding of the second gear sleeve 35, different speeds can be adjusted. After the second gear hub 34 rotates, it drives the intermediate shaft 3 and the fifth gear 33 to rotate, and drives the sixth gear 51 to rotate through the fifth gear 33. After the sixth gear 51 rotates, it drives the rear output shaft 5 to rotate, thereby transmitting power to the rear axle of the vehicle. When the driver needs the four-wheel drive mode, the driver drives the corresponding connecting rod 7 through the gear lever, and the connecting rod 7 pulls the shift fork 6, causing the first gear sleeve 53 to slide, thereby connecting the first gear hub 52 to the connecting gear 41, thereby driving the front output shaft 4 and the rear output shaft 5 to rotate synchronously, so that the front and rear axles of the vehicle, a total of four vehicles, rotate at the same time to achieve four-wheel drive.

[0026] Compared with the traditional four-wheel drive system of automobiles, the gearbox of the present application has a simple structure and low manufacturing cost. While meeting the speed shifting and two / four-wheel drive switching requirements of agricultural vehicles, it can reduce the manufacturing cost of agricultural vehicles and improve the market competitiveness of vehicles.

[0027] like Figure 7As shown, the first gear hub 52 and the rear output shaft 5 are rigidly connected, one end of the front output shaft 4 is inserted into the inner hole of the first gear hub 52, and a bearing is provided in the inner hole, so that the front output shaft 4 and the rear output shaft 5 are coaxially installed, and synchronous or asynchronous rotation can be achieved. The circumferential surface of the contact surface between the front output shaft 4 and the rear output shaft 5 reduces the friction through the bearing, reduces the wear rate of the front output shaft 4 and the rear output shaft 5, and improves the service life of the gearbox.

[0028] Preferably, a second gear hub 34 is provided between the third gear 31 and the fourth gear 32, the second gear hub 34 is fixedly connected to the intermediate shaft 3, a first gear sleeve 53 is provided on the first gear hub 52, and a second gear sleeve 35 is provided on the second gear hub 34. Through the sliding of the second gear sleeve 35, the second gear hub 34 and the third gear 31 or the second gear hub 34 and the fourth gear 32 can be controlled to be connected, thereby controlling the transmission ratio of the gearbox and realizing speed change.

[0029] Preferably, if Figure 3 As shown, a connecting gear 41 is provided on the front output shaft 4, and the connecting gear 41 is connected to the first gear hub 52 through a first gear sleeve 53. After the first gear sleeve 53 slides, the first gear hub 52 can be connected to the connecting gear 41, so that the front output shaft 4 and the rear output shaft 5 rotate synchronously, realizing the vehicle's four-wheel drive mode.

[0030] Specifically, Figure 5 As shown, key teeth 36 are provided on one side of the third gear 31 and one side of the fourth gear 32. The third gear 31 and the fourth gear 32 are respectively connected to the second gear sleeve 35 through the key teeth 36. The second gear sleeve 35 is provided with a plurality of slots. When the second gear sleeve 35 is sleeved on the third gear 31 or the fourth gear 32, the second gear sleeve 35 can clamp the key teeth 36 through the slots, thereby realizing synchronous rotation of the gears, gear sleeves and gear hubs and achieving gear shifting.

[0031] In a preferred embodiment, Figure 6 As shown, a shift fork 6 is provided on the first gear sleeve 53 and the second gear sleeve 35 respectively, and a connecting rod 7 is provided outside the housing 1. The shift fork 6 is connected to the gear lever of the vehicle through the connecting rod 7, so that the connecting rod 7 and the shift fork 6 are driven by the gear lever, thereby driving the first gear sleeve 53 or the second gear sleeve 35 to slide, thereby realizing the functions of speed change and two-wheel drive / four-wheel drive switching.

[0032] Preferably, one end of the input shaft 2 is connected to the internal combustion engine of the vehicle, and a pulley 23 is provided at the other end of the input shaft 2 to facilitate the introduction of the power of the internal combustion engine into the gearbox. The pulley 23 can output torque outward to facilitate driving equipment such as pumps and generators to achieve multi-functional switching of the vehicle.

[0033] In a preferred embodiment, a refueling hole 11 is provided at the upper portion of the housing 1, an oil drain hole 12 is provided at the lower portion of the housing 1, and sealing nuts are provided on the refueling hole 11 and the oil drain hole 12 to facilitate refueling and oil draining operations when the gearbox is in position.

[0034] Of course, the present application may have many other implementations. Based on the present implementation, other implementations obtained by ordinary technicians in this field without any creative work are all within the scope of protection of the present application.

Claims

1. A four-wheel drive gearbox for agricultural vehicles, characterized in that: include: A housing (1), an input shaft (2), an intermediate shaft (3), a front output shaft (4), and a rear output shaft (5), wherein the input shaft (2) passes through the housing (1), one end of the front output shaft (4) and the rear output shaft (5) are respectively inserted into the housing (1), and the front output shaft (4) and the rear output shaft (5) are on the same straight line; the intermediate shaft (3) is arranged between the rear output shaft (5) and the input shaft (2); a first gear (21) and a second gear (22) are fixedly mounted on the input shaft (2); a third gear (31), a fourth gear (32), and a fifth gear (33) are arranged on the intermediate shaft (3), and the fifth gear (31) and the fourth gear (32) and the fifth gear (33) are fixedly mounted on the input shaft (2); 3) is fixedly connected to the intermediate shaft (3), the third gear (31) and the fourth gear (32) are connected to the intermediate shaft (3) through bearings, and the third gear (31) is meshed with the first gear (21), and the fourth gear (32) is meshed with the second gear (22); a sixth gear (51) and a first gear hub (52) are fixedly mounted on the rear output shaft (5), the sixth gear (51) is meshed with the fifth gear (33), one side of the inner hole of the first gear hub (52) is fixedly connected to the rear output shaft (5), and a bearing is provided on the other side of the inner hole of the first gear hub (52), and one end of the front output shaft (4) is inserted into the inner hole of the first gear hub (52).

2. A four-wheel drive gearbox for agricultural vehicles according to claim 1, characterized in that: A second gear hub (34) is provided between the third gear (31) and the fourth gear (32), the second gear hub (34) is fixedly connected to the intermediate shaft (3), a first gear sleeve (53) is provided on the first gear hub (52), and a second gear sleeve (35) is provided on the second gear hub (34).

3. A four-wheel drive gearbox for agricultural vehicles according to claim 2, characterized in that: The front output shaft (4) is provided with a connecting gear (41), and the connecting gear (41) is connected to the first gear hub (52) via a first gear sleeve (53).

4. A four-wheel drive gearbox for agricultural vehicles according to claim 2, characterized in that: One side of the third gear (31) and one side of the fourth gear (32) are both provided with key teeth (36), and the third gear (31) and the fourth gear (32) are respectively connected to the second gear sleeve (35) via the key teeth (36).

5. A four-wheel drive gearbox for agricultural vehicles according to claim 2, characterized in that: The first gear sleeve (53) and the second gear sleeve (35) are respectively provided with a shift fork (6), the outer shell (1) is provided with a connecting rod (7), and the shift fork (6) is connected to a gear lever of the vehicle via the connecting rod (7).

6. A four-wheel drive transmission for agricultural vehicles according to claim 1, characterized in that: One end of the input shaft (2) is connected to the internal combustion engine of the vehicle, and the other end of the input shaft (2) is provided with a pulley (23).

7. A four-wheel drive transmission for agricultural vehicles according to claim 1, characterized in that: The upper part of the housing (1) is provided with a refueling hole (11), the lower part of the housing (1) is provided with an oil drain hole (12), and the refueling hole (11) and the oil drain hole (12) are provided with sealing nuts.

Images