Transmission mechanism of compact tractor differential mechanism

Abstract

The utility model relates to the technical field of tractor power mechanisms, in particular to a compact transmission mechanism of a tractor differential mechanism. According to the transmission mechanism, the integrated bevel gear shaft is adopted, forward and reverse rotation of power output is achieved through the reversing driven gear set installed on the bevel gear shaft, and rotation speed adjustment of the power output is achieved through the gear shifting driven gear set installed on the bevel gear shaft. The structure is compact and reasonable, the concentricity of the shaft is high, the operation stability is good, and shaft breakage accidents can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of tractor power mechanisms, and specifically relates to a transmission mechanism of a compact tractor differential. Background Art

[0002] The main function of a tractor differential is to adjust the rotational speed difference between the two driving wheels to ensure that the tractor can work stably and smoothly when turning or driving on an uneven road surface. When turning, since the turning radii of the inner wheel and the outer wheel are different, the rotational speed of the outer wheel needs to be higher than that of the inner wheel. The differential allows the two wheels to rotate at different speeds, ensuring that the tractor can turn smoothly, reducing tire wear and power consumption. The power input shaft of the tractor differential meshes with the gear on the tractor clutch transmission shaft through an intermediate transmission shaft and the gear mounted on this intermediate transmission shaft, so as to obtain the power from the tractor clutch. The power input shaft of the tractor differential and the intermediate transmission shaft on which the gear is mounted are two split shafts arranged coaxially. High concentricity is required during installation, and the structure of the split shaft is loose and the transmission path is long, making it difficult to ensure the concentricity of the installation; in addition, the working environment of the tractor is harsh and the load is large. During use, the split shaft bears a large torque and is prone to breakage. Content of the Utility Model

[0003] The utility model provides a transmission mechanism of a compact tractor differential with a compact and reasonable structure and high concentricity of the shaft, effectively reducing the occurrence of shaft breakage accidents.

[0004] The technical solution adopted by the utility model to solve the technical problems is:

[0005] The transmission mechanism of a differential of a compact tractor described in the present utility model includes a bevel gear shaft with a bevel gear fixedly installed at the rear end, and a transmission shaft arranged parallel to the bevel gear shaft. The transmission shaft is in transmission connection with the output end of a clutch. The bevel gear is constantly meshed with a central driven bevel gear of the differential. A reversing driven gear set and a shifting driven gear set are installed on the bevel gear shaft. A reversing driving gear set adapted to the reversing driven gear set and a shifting driving gear set adapted to the shifting driven gear set are installed on the transmission shaft. The reversing driving gear set includes a first engaging gear fixedly connected to the transmission shaft, a second engaging gear rotatably installed on the first transmission shaft of the gearbox through a bearing, and an engaging sleeve assembly fixedly connected to the front end of the first transmission shaft of the gearbox and capable of engaging with the first engaging gear or the second engaging gear respectively. The first transmission shaft of the gearbox is circular tubular and rotatably sleeved on the transmission shaft through a bearing. The reversing driven gear set is a double gear rotatably installed on the bevel gear shaft through a bearing. One end of the double gear is constantly meshed with the first engaging gear, and the other end is in transmission connection with the second engaging gear through an intermediate gear. A rear spline is arranged on the bevel gear shaft between the double gear and the bevel gear. The shifting driven gear set cooperates with the shifting driving gear set to realize multi-gear changes.

[0006] Through this solution, the power input shaft of the tractor differential and the intermediate transmission shaft are combined into one bevel gear shaft, which has a compact and reasonable structure, high concentricity of the shaft, and can effectively reduce the occurrence of shaft breakage accidents.

[0007] Preferably, a front spline is arranged on the bevel gear shaft in front of the double gear. A front drive active gear is fixedly installed on the front spline. The front drive active gear is in transmission connection with the front axle drive mechanism of the tractor.

[0008] Through this solution, power can be provided for the front axle drive mechanism to realize four-wheel drive.

[0009] Preferably, the first engaging gear is installed on the transmission shaft through a spline. The engaging sleeve assembly is located between the first engaging gear and the second engaging gear. The engaging sleeve assembly includes an engaging sleeve core fixedly installed on the first transmission shaft of the gearbox through a spline, and a sliding sleeve sleeved on the engaging sleeve core. External splines are arranged on the outer wall of the engaging sleeve core, and internal splines adapted to the external splines are arranged on the inner wall of the sliding sleeve. Engaging spline shafts adapted to the internal splines on the sliding sleeve are fixedly connected to one side of the first engaging gear and the second engaging gear facing the engaging sleeve assembly.

[0010] Through this solution, the sliding sleeve on the engaging sleeve assembly can be axially moved to engage with the first engaging gear or the second engaging gear respectively to realize forward and reverse switching.

[0011] Preferably, a support bearing is provided in the middle section of the bevel gear shaft. The support bearing is located between the reversing driven gear set and the shifting driven gear set, and the outer ring surface of the support bearing is mounted on the transmission housing.

[0012] With this solution, the support bearing plays a role in supporting the middle section of the bevel gear shaft, which can improve the rotational stability of the bevel gear shaft, reduce radial jitter, thereby extending the service life of the bevel gear shaft and reducing the occurrence of shaft breakage accidents.

[0013] Preferably, the bevel gear shaft is of an integral structure.

[0014] With this solution, the concentricity of the bevel gear shaft can be ensured, the power transmission efficiency can be improved, and the failure rate of shaft breakage can be reduced.

[0015] Due to the adoption of the above structure, the transmission mechanism is compact and reasonable in structure, has high concentricity of the shaft, good running stability, and can effectively reduce the occurrence of shaft breakage accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic cross-sectional structure view of an embodiment of the present utility model.

[0017] Figure 2 is a schematic three-dimensional structure view of the bevel gear shaft.

[0018] Figure 3 is a schematic three-dimensional structure view of the transmission shaft.

[0019] Figure 4 is a schematic three-dimensional structure view of the transmission shaft I of the transmission.

[0020] Figure 5 is a schematic three-dimensional structure view of the engagement sleeve assembly.

[0021] Figure 6 is a schematic three-dimensional structure view of the first engagement gear.

[0022] Figure 7 is a schematic three-dimensional structure view of an embodiment of the present utility model.

[0023] Figure 8 is a sectional view of the use state of an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present utility model will be further described in detail below with reference to the accompanying drawings. The same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "bottom surface" and "top surface", "inner" and "outer" respectively refer to the directions away from the geometric center of the specific component.

[0025] As Figure 1 shown, the transmission mechanism of a differential of a compact tractor according to the present utility model includes a bevel gear shaft 2 fixedly installed with a bevel gear 1 at the rear end, and a transmission shaft 3 arranged parallel to the bevel gear shaft 2. The transmission shaft 3 is in transmission connection with the output end of the clutch, that is, the front end of the transmission shaft 3 is in transmission connection with the clutch disc, and the connection between the transmission shaft 3 and the engine output shaft is controlled by the clutch; when the clutch is engaged, the power of the engine can be transmitted to the transmission shaft 3 through the clutch disc and then transmitted backward through the transmission shaft 3.

[0026] The bevel gear 1 is constantly meshed with the central driven bevel gear of the differential, and the bevel gear shaft 2 is an integral structure. A reversing driven gear set and a shifting driven gear set are installed on the bevel gear shaft 2, and a reversing driving gear set adapted to the reversing driven gear set and a shifting driving gear set adapted to the shifting driven gear set are installed on the transmission shaft 3; the reversing driving gear set and the reversing driven gear set cooperate to realize the forward and reverse rotation of the power output by the transmission shaft I of the gearbox. The shifting driving gear set and the shifting driven gear set cooperate to realize the change of speeds in different gears.

[0027] As Figure 1 、 Figure 7 shown, the reversing driving gear set includes a first engaging gear 31 fixedly connected to the transmission shaft 3, a second engaging gear 33 rotatably installed on the transmission shaft I 32 of the gearbox through a bearing, and an engaging sleeve assembly 34 fixedly connected to the front end of the transmission shaft I 32 and capable of engaging with the first engaging gear 31 or the second engaging gear 33 respectively. The engaging sleeve assembly 34 can engage with the first engaging gear 31 forward and achieve linkage, and can engage with the second engaging gear 33 backward and achieve linkage.

[0028] As Figure 3 、 Figure 4 shown, the transmission shaft I of the gearbox is a circular tube and is rotatably sleeved on the transmission shaft 3 through a bearing. The transmission shaft I 32 of the gearbox is coaxially arranged with the transmission shaft 3, and the two are connected by a bearing or a sliding sleeve, so that the transmission shaft I 32 does not rotate with the transmission shaft 3.

[0029] The reversing driven gear set is a double gear 8 rotatably mounted on the bevel gear shaft 2 through bearings. The double gear 8 includes two gears fixedly connected to both ends of a sleeve, and these two gears are connected into an integral structure through the sleeve. One end of the double gear 8 is constantly meshed with the first engaging gear 31, and the other end is drivingly connected to the second engaging gear 33 through an intermediate gear 4. When the engaging sleeve assembly 34 moves forward to engage with the first engaging gear 31 of the reversing driving gear set, the engaging sleeve assembly 34 disengages from the second engaging gear 33. While the first engaging gear 31 rotates with the transmission shaft 3, it drives the double gear 8 and the engaging sleeve assembly 34 to rotate. The engaging sleeve assembly 34 drives the first shaft of the transmission I to rotate forward, and the second engaging gear 33 idles on the first shaft of the transmission I driven by the intermediate gear 4. Conversely, when the engaging sleeve assembly 34 moves backward to engage with the second engaging gear 33 of the reversing driving gear set, the engaging sleeve assembly 34 disengages from the first engaging gear 31. At this time, while the first engaging gear 31 rotates with the transmission shaft 3, it can only drive the double gear 8 to rotate. The double gear 8 drives the second engaging gear 33 and the engaging sleeve assembly 34 to rotate in the reverse direction through the intermediate gear 4, and the engaging sleeve assembly 34 drives the first shaft of the transmission I to rotate in the reverse direction.

[0030] The first engaging gear 31 is mounted on the transmission shaft 3 through splines so that the first engaging gear 31 can always rotate with the transmission shaft 3. The engaging sleeve assembly 34 is located between the first engaging gear 31 and the second engaging gear 33.

[0031] As Figure 1 , Figure 5 shown, the engaging sleeve assembly includes a sleeve core 37 fixedly mounted on the first shaft 32 of the transmission through splines and a sliding sleeve 38 sleeved on the sleeve core 37. The sleeve core 37 always rotates with the first shaft 32 of the transmission. External splines are provided on the outer wall of the sleeve core 37, and internal splines adapted to the external splines are provided on the inner wall of the sliding sleeve 38, so that the sliding sleeve 38 can rotate synchronously with the sleeve core 37 and can axially move on the sleeve core 37. A fork groove is provided on the outer wall of the sliding sleeve 38, and the sliding sleeve 38 can be axially moved by using a fork during use; As Figure 6As shown, the first engaging gear 31 and the second engaging gear 33 are both fixedly connected to the engaging spline shaft 11 adapted to the internal spline on the sliding sleeve 38 on one side of the engaging sleeve assembly. The sliding sleeve 38 slides forward axially for a certain distance on the engaging sleeve core 37, and the front end of the sliding sleeve 38 engages with the engaging spline shaft 11 on the first engaging gear 31, so that the sliding sleeve 38 rotates synchronously with the first engaging gear 1, and the sliding sleeve 38 drives the engaging sleeve core 37 to rotate synchronously, and the engaging sleeve core 37 drives the gearbox I shaft 32 connected with its spline to rotate synchronously. Conversely, when the sliding sleeve 38 slides backward axially for a certain distance on the engaging sleeve core 37, the sliding sleeve 38 is separated from the first engaging gear 1, and the rear end of the sliding sleeve 38 is engaged with the engaging spline shaft on the second engaging gear 33, and is driven by the second engaging gear 33 to rotate with the second engaging gear 33, and at this time, the gearbox I shaft 32 will also rotate with the sliding sleeve 38 and the engaging sleeve core 37.

[0032] A rear end spline 21 is provided on the bevel gear shaft 2 between the double gear 8 and the bevel gear 1 , and the shift driven gear set 23 cooperates with the shift driving gear set 36 to achieve multi-gear changes.

[0033] Of course, the driving gear set 36 and the shift driven gear set 23 both include a plurality of gears of different specifications, and different transmission ratios are achieved through the meshing of different gears. The structure and working principle of this part are prior art and will not be described in detail here.

[0034] In addition, as a further improvement of the present invention, Figure 1 , Figure 7 , Figure 8 As shown, a front spline 24 is provided on the bevel gear shaft 2 in front of the double gear 8, and a front drive driving gear 25 is fixedly mounted on the front spline 24, and the front drive driving gear 25 is transmission-connected with the front axle driving mechanism of the tractor. When the bevel gear shaft 2 rotates, the front axle driving mechanism of the tractor can be driven to operate through the front drive driving gear 25 to realize four-wheel drive.

[0035] A support bearing 26 is provided in the middle section of the bevel gear shaft 2. The support bearing 26 is located between the reversing driven gear set 4 and the shifting driven gear set, and the outer ring surface of the support bearing 26 is mounted on the gearbox body. In this way, adding support in the middle of the longer bevel gear shaft 2 can improve the strength of the bevel gear shaft 2 and reduce the radial vibration of the bevel gear shaft 2 when it rotates.

[0036] Although the above has described in detail some specific embodiments of the present utility model through examples, those skilled in the art should understand that the above examples are only for the purpose of illustration and not for limiting the scope of the present utility model. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present utility model. The scope of the present utility model is defined by the appended claims.

Claims

1. A transmission mechanism for a differential of a compact tractor, comprising a bevel gear shaft (2) fixedly installed with a bevel gear (1) at the rear end, a transmission shaft (3) arranged parallel to the bevel gear shaft (2), the transmission shaft (3) being in transmission connection with the output end of a clutch, the bevel gear (1) being constantly meshed with a central driven bevel gear of the differential, characterized in that: A reversing driven gear set and a shifting driven gear set (23) are mounted on the bevel gear shaft (2). A reversing driving gear set adapted to the reversing driven gear set and a shifting driving gear set (36) adapted to the shifting driven gear set (23) are mounted on the transmission shaft (3). The reversing driving gear set includes a first engaging gear (31) fixedly connected to the transmission shaft (3), a second engaging gear (33) rotatably mounted on the transmission gearbox I shaft (32) through a bearing, and an engaging sleeve assembly (34) fixedly connected to the front end of the transmission gearbox I shaft (32) and capable of engaging with the first engaging gear (31) or the second engaging gear (33) respectively. The transmission gearbox I shaft is a circular tube and is rotatably sleeved on the transmission shaft (3) through a bearing. The reversing driven gear set is a double gear (8) rotatably mounted on the bevel gear shaft (2) through a bearing. One end of the double gear (8) is constantly meshed with the first engaging gear (31), and the other end is drivingly connected to the second engaging gear (33) through an intermediate gear. A rear spline (21) is provided on the bevel gear shaft (2) between the double gear (8) and the bevel gear (1). The shifting driven gear set (23) cooperates with the shifting driving gear set (36) to achieve multi-gear changes.

2. The transmission mechanism of a compact tractor differential according to claim 1, characterized in that: A front spline (24) is provided on the bevel gear shaft (2) in front of the double gear (8). A front driving gear (25) is fixedly mounted on the front spline (24). The front driving gear (25) is drivingly connected to the front axle drive mechanism of the tractor.

3. The transmission mechanism of a compact tractor differential according to claim 1 or 2, characterized in that: The first engaging gear (31) is mounted on the transmission shaft (3) through a spline. The engaging sleeve assembly (34) is located between the first engaging gear (31) and the second engaging gear (33). The engaging sleeve assembly includes an engaging sleeve core (37) fixedly mounted on the transmission gearbox I shaft (32) through a spline and a sliding sleeve (38) sleeved on the engaging sleeve core (37). External splines are provided on the outer wall of the engaging sleeve core (37), and internal splines adapted to the external splines are provided on the inner wall of the sliding sleeve (38). Engaging spline shafts (11) adapted to the internal splines on the sliding sleeve (38) are fixedly connected to one sides of the first engaging gear (31) and the second engaging gear (33) facing the engaging sleeve assembly.

4. The transmission mechanism of a compact tractor differential according to claim 1 or 2, characterized in that: A support bearing (26) is provided in the middle section of the bevel gear shaft (2). The support bearing (26) is located between the reversing driven gear set (4) and the shifting driven gear set. The outer ring surface of the support bearing (26) is mounted on the transmission housing.

5. The transmission mechanism of a compact tractor differential according to claim 1 or 2, characterized in that: The bevel gear shaft (2) is of an integral structure.

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