CN219007592U - Tractor and transmission device thereof - Google Patents

Abstract

The utility model relates to the field of agricultural machinery, and discloses a tractor and a transmission device thereof, wherein the transmission device comprises a transmission assembly, a hydraulic pump mounting shell (K2) and a PTO driving shaft (7), the transmission assembly comprises a transmission shell (K1), the hydraulic pump mounting shell (K2) is detachably connected to the transmission shell (K1) and is provided with a driven bevel gear shaft mounting seat (84) and a hydraulic pump mounting seat (81) which are coaxially arranged, the driven bevel gear shaft mounting seat (84) is pivotally provided with a driven bevel gear shaft (83) provided with a driven bevel gear (85), and the PTO driving shaft (7) is provided with a driving bevel gear (86) meshed with the driven bevel gear (85). The transmission device can easily ensure coaxiality between the driven bevel gear and the central axis of the input shaft of the hydraulic pump in processing and assembling, and is convenient for replacing or adjusting the meshing position of the driving bevel gear.

Description

Tractor and transmission device thereof

Technical Field

The utility model relates to agricultural machinery, in particular to a transmission device of a tractor. On the basis, the utility model also relates to a tractor provided with the transmission device.

Background

Generally, a tractor uses a diesel engine as a power unit to supply power for driving walking, work, etc. The power (namely torque and rotating speed) output by the diesel engine through the crankshaft and the flywheel is reasonably distributed to working devices such as a driving wheel, a power output device (PTO), a hydraulic pump and the like after passing through the transmission device, so that various agricultural operation functions of the tractor are realized.

Wherein the PTO drive shaft may be drivingly connected (e.g., directly connected) to a crankshaft of the engine, and the power it receives from the engine may be distributed to a hydraulic pump mounted on a housing of the transmission while being transmitted to a rear-end PTO output shaft to drive the hydraulic pump to generate pressurized oil for lift cylinders, steering assist, etc. For this purpose, the PTO drive shaft may be splined with a drive bevel gear which may be pivotally mounted by means of bearings on a support wall formed in the housing of the transmission; meanwhile, the support wall forms a driven bevel gear holding part protruding rearward, and a driven bevel gear having a rotation axis perpendicular to an axial direction of the PTO drive shaft is mounted by the driven bevel gear holding part such that the driven bevel gear meshes with the aforementioned drive bevel gear and is drivingly connected to a hydraulic pump mounted on a housing of the transmission so as to be able to acquire power transmitted by the PTO drive shaft.

The above-described prior art can easily achieve a desired meshing accuracy by forming the mounting bases of the drive bevel gear and the driven bevel gear on the same support wall. However, the coaxiality between the central axes of the driven bevel gear and the input shaft of the hydraulic pump is difficult to ensure by the arrangement mode, and abnormal stress is caused to the transmission part by different coaxial operation, so that phenomena such as noise, clamping stagnation and the like occur, and the service lives of the transmission part and the hydraulic pump are shortened. Meanwhile, when the meshing position of the drive bevel gear needs to be replaced or adjusted, a hydraulic pump, a spline housing and other driving parts, a driven bevel gear and the like need to be disassembled, and the disassembly and assembly process is complex.

Disclosure of Invention

The utility model aims to solve the problems of noise, clamping stagnation, damage and the like caused by the insufficient coaxiality between the driven bevel gear and the central axis of the input shaft of the hydraulic pump in the prior art, and provides a transmission device of a tractor, which can easily ensure the coaxiality between the driven bevel gear and the central axis of the input shaft of the hydraulic pump in the processing and assembly processes, thereby avoiding abnormal stress of transmission parts, reducing the risks of noise, clamping stagnation and other phenomena, ensuring the service lives of the transmission parts and the hydraulic pump, and effectively simplifying the disassembly and assembly process when the meshing position of a driving bevel gear is replaced or adjusted.

In order to achieve the above object, an aspect of the present utility model provides a transmission device of a tractor, comprising:

a transmission assembly including a transmission housing having a first end for connection to a drive device and a second end opposite the first end;

a hydraulic pump mounting housing detachably connected to a second end of the transmission housing and provided with a driven bevel gear shaft mounting seat and a hydraulic pump mounting seat coaxially disposed with each other, the driven bevel gear shaft mounting seat pivotally mounted with a driven bevel gear shaft provided with a driven bevel gear; and

a PTO drive shaft extending through the transmission housing and the hydraulic pump mounting housing and provided with a drive bevel gear at a portion penetrating into the hydraulic pump mounting housing, the drive bevel gear being engaged with the driven bevel gear so as to be able to transmit rotational power of the PTO drive shaft to a hydraulic pump mounted to the hydraulic pump mounting seat.

A second aspect of the utility model provides a tractor provided with a transmission as described above.

Through the technical scheme, the transmission device is provided with the hydraulic pump installation shell which is detachably connected to the transmission shell, and the driven bevel gear shaft installation seat and the hydraulic pump installation seat are both arranged on the hydraulic pump installation shell, so that the coaxiality between the driven bevel gear and the central axis of the hydraulic pump input shaft can be easily ensured in processing and assembling, abnormal stress of transmission parts is avoided, the risks of noise, clamping stagnation and other phenomena are reduced, and the service lives of the transmission parts and the hydraulic pump are ensured. When the meshing position of the drive bevel gear needs to be replaced or adjusted, the connection between the hydraulic pump installation shell and the gearbox shell is only disconnected, the hydraulic pump and the driven bevel gear do not need to be independently disassembled, and the disassembly and assembly process of the drive bevel gear is effectively simplified.

Drawings

Fig. 1 is a schematic cross-sectional view of a transmission of a tractor according to a preferred embodiment of the present utility model.

Description of the reference numerals

1-a power input shaft of a travelling mechanism; 2-reversing gear sets; 20-reversing shaft; 21-forward output gear; 22-reverse output gear; 23-reversing the first drive gear; 24-reversing the second drive gear; 25-a walking input gear; 3-a main speed change gear set; 30-a main transmission gear shaft; 30 a-a driving shaft; 30 b-intermediate shaft; 31 a-a first speed drive gear; 31 b-a second speed drive gear; 31 c-first speed driven gear; 31 d-a second speed driven gear; 4-a range gear set; 41-a low-speed drive gear; 42-a low-speed driven gear; 43-high speed driven gear; 5-walking power output shaft; 51-rear axle drive shaft; 52-a front axle drive shaft; 61-front axle drive shaft drive gear; 62-front axle drive shaft driven gear; 7-PTO drive shaft; 81-a hydraulic pump mount; 82-spline housing; 83-driven bevel gear shaft; 84-a driven bevel gear shaft mount; 85-driven bevel gears; 86-drive bevel gear; 87-a drive bevel gear support; k1-a transmission housing; k2-hydraulic pump installation shell; b1-front support wall; b2-an intermediate support wall; b3-rear support wall; s1-a first chamber; s2-a second chamber.

Detailed Description

The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.

Referring to fig. 1, a transmission of a tractor according to a preferred embodiment of the present utility model may be used to transmit power generated by an engine to working devices such as a driving wheel, a PTO, and a hydraulic pump. To this end, the transmission may be connected to the crankshaft and flywheel of the engine, e.g. at one end towards the engine (e.g. the front end), wherein the crankshaft of the engine may be directly connected to the PTO drive shaft 7, the rear end of which PTO drive shaft 7 may be splined for rotation to a PTO output shaft (not shown); meanwhile, the PTO drive shaft 7 may also be spline-coupled with a drive bevel gear 86 provided thereon, the drive bevel gear 86 being engaged with a driven bevel gear 85, and a driven bevel gear shaft 83 provided with the driven bevel gear 85 may be spline-coupled to an input shaft of a hydraulic pump (not shown) that may be mounted to the hydraulic pump mount 81 so as to distribute a part of power output from the engine crankshaft to the hydraulic pump. The engine flywheel can be connected with the running mechanism power input shaft 1 in an on-off mode through a clutch, and the power input by the running mechanism power input shaft 1 can be sequentially subjected to reversing and speed regulation through the reversing gear set 2, the main speed change gear set 3 and the auxiliary speed change gear set 4 and finally transmitted to the running power output shaft 5 (such as a rear axle driving shaft 51 and a front axle driving shaft 52) so as to drive the tractor to run.

As can be seen from the above general description of the transmission according to the utility model, the transmission essentially comprises the following functional modules: a reversing and speed-changing transmission section for transmitting power generated by the engine to the drive wheels through the reversing gear set 2, the main speed-changing gear set 3, and the like; a PTO transmission portion for transmitting power generated by the engine to a PTO output shaft through a PTO drive shaft 7; and a hydraulic pump driving section for distributing a part of the power transmitted from the PTO drive shaft 7 to the hydraulic pump. These parts are mainly arranged and mounted in the housing parts, i.e. the transmission housing K1 and the hydraulic pump mounting housing K2 of the transmission of the utility model, for reliable support of the transmission parts of the functional modules.

To this end, the transmission may comprise a transmission assembly, which may have a transmission housing K1. For the sake of clarity, the two ends of the transmission housing K1 are described as a first end and a second end, respectively, which are opposite to each other, wherein the first end may be used for a housing connected to a driving device (e.g. an engine) by means of e.g. bolts, and the second end is connected to a hydraulic pump mounting housing K2. While the end of the hydraulic pump mount housing K2 remote from the transmission housing K1 may be connected to the rear axle housing, thereby collectively forming the chassis of the tractor.

Wherein the hydraulic pump mounting housing K2 may be detachably connected to the second end of the transmission housing K1 by, for example, bolts, and the hydraulic pump mounting housing K2 is formed thereon with a driven bevel gear shaft mounting seat 84 and a hydraulic pump mounting seat 81 coaxially disposed with each other, the driven bevel gear shaft mounting seat 84 being pivotally mounted with a driven bevel gear shaft 83 provided with a driven bevel gear 85. Therefore, since the driven bevel gear shaft mounting seat 84 and the hydraulic pump mounting seat 81 are both arranged on the hydraulic pump mounting housing K2, the coaxiality between the driven bevel gear 85 and the central axis of the hydraulic pump input shaft can be easily ensured in processing and assembly, abnormal stress of a transmission part is avoided, the risks of noise, clamping stagnation and other phenomena are reduced, and the service lives of the transmission part and the hydraulic pump are ensured.

In order to obtain power for driving the hydraulic pump using the PTO drive shaft 7, the PTO drive shaft 7 may be provided to extend through the transmission housing K1 and the hydraulic pump mounting housing K2 and be provided with a drive bevel gear 86 at a portion penetrating into the hydraulic pump mounting housing K2. The drive bevel gear 86 is provided to mesh with the driven bevel gear 85 so as to be able to transmit the rotational power of the PTO drive shaft 7 to the hydraulic pump attached to the hydraulic pump mount 81. Here, since the driven bevel gear shaft mounting seat 84 is provided to the hydraulic pump mounting housing K2, and the hydraulic pump mounting housing K2 is detachably connected to the transmission housing K1, when the engagement position of the drive bevel gear 86 needs to be changed or adjusted, the hydraulic pump mounting housing K2 and the transmission housing K1 can be changed or adjusted only by disconnecting them without separately disassembling the hydraulic pump and the driven bevel gear 85, etc., and the disassembly and assembly process thereof is effectively simplified.

According to the above, the transmission of the present utility model provides the driven bevel gear shaft mount 84 on the hydraulic pump mount housing K2, whereby coaxiality with respect to the hydraulic pump mount 81 can be ensured by machining as with the hydraulic pump mount 81 under the same reference. The driven bevel gear shaft mount 84 may be provided to the hydraulic pump mount housing K2 in a variety of suitable ways, such as being machined separately from the rest of the hydraulic pump mount housing K2 and positioned and assembled as one piece. In a preferred embodiment of the present utility model, the top wall of the hydraulic pump mounting housing K2 is formed to protrude downward as the driven bevel gear shaft mounting seat 84, and the hydraulic pump mounting seat 81 is provided on the side wall of the hydraulic pump mounting housing K2 for the convenience of arrangement, whereby machining can be performed on the same basis, ensuring coaxiality of both, whereby it can be ensured that there is high coaxiality between the driven bevel gear 85 and the central axis of the input shaft of the hydraulic pump after being mounted, thereby avoiding abnormal stress of the transmission parts.

Wherein the driven bevel gear shaft 83 provided with the driven bevel gear 85 may be provided to have a small extension length with respect to the space between the hydraulic pump mount block 81 and the driven bevel gear shaft mount block 84, thereby enabling easy installation. In this case, the driven bevel gear shaft 83 may be drivingly connected to the input shaft of the hydraulic pump through the spline housing 82 between the hydraulic pump mount 81 and the driven bevel gear shaft mount 84.

With continued reference to fig. 1, the PTO drive shaft 7 extends through the transmission housing K1 and the hydraulic pump mounting housing K2, and on its extension path, the PTO drive shaft 7 should be reasonably supported so as to be able to stably transmit power. For this reason, a plurality of support walls (a front support wall B1, a middle support wall B2, and a rear support wall B3) may be formed or installed in the transmission case K1, and the number of support walls should not be excessive so as not to occupy a limited space in the transmission case K1, affecting the arrangement of transmission gears and the like.

Wherein the second end of the transmission housing K1 may be provided with a rear support wall B3, a side of the rear support wall B3 facing the hydraulic pump mounting housing K2 being formed with a drive bevel gear support seat 87. Thereby, the PTO drive shaft 7 may extend through the drive bevel gear support 87 into the hydraulic pump mounting housing K2 and rotatably support the drive bevel gear 86 to the drive bevel gear support 87. When it is necessary to adjust or replace the engagement position of the drive bevel gear 86, the hydraulic pump mounting housing K2 can be detached from the transmission housing K1 together with the hydraulic pump, the driven bevel gear shaft 83, the driven bevel gear 85, and the like mounted thereon, without separately detaching the driven bevel gear 85, and the like from the hydraulic pump mounting housing K2.

In the illustrated preferred embodiment, the running gear power input shaft 1 and the PTO drive shaft 7 extend through a first end of the transmission housing K1 for direct or indirect connection to the engine. As described above, in order to realize the walking function of the tractor, the walking mechanism power input shaft 1 is in driving connection with the walking power output shaft 5 through the reversing gear set 2 and the main speed change gear set 3, so as to be capable of driving the wheels to rotate in different directions or with different transmission ratios, thereby changing the running speed and traction force of the tractor, or enabling the tractor to run in reverse under the condition that the rotation direction of the engine is unchanged. The reversing gear set 2 and the main gear set 3 and the auxiliary gear set described later are each arranged in the transmission housing K1, and gear shifting can be achieved by means of a suitable actuating mechanism. The reversing gear set 2 can be switched to rotate the walking power output shaft 5 in different directions, so that the tractor can be switched between forward and reverse running; the main gear set 3 can be switched such that the travelling power output shaft 5 has different gear ratios with respect to the travelling mechanism power input shaft 1, so that the tractor has different travelling speeds and traction forces.

In order to reasonably arrange and support the reversing gear set 2 and the main speed change gear set 3, among others, a front support wall B1, a middle support wall B2, and a rear support wall B3 are formed or installed in the transmission case K1. Wherein, as mentioned before, the rear support wall B3 is located at the second end of the transmission housing K1, the middle support wall B2 is spaced from the rear support wall B3, and the front support wall B1 is located closer to the first end of the transmission housing K1 than the middle support wall B2. Thus, the inner cavity of the transmission case K1 is partitioned into a plurality of areas, and the front and rear side spaces partitioned by the intermediate support wall B2 are referred to as a first chamber S1 and a second chamber S2, respectively, i.e., the area between the front support wall B1 and the intermediate support wall B2 is the first chamber S1, and the area between the intermediate support wall B2 and the rear support wall B3 is the second chamber S2. The drive shafts (e.g., running gear power input shaft 1, reversing shaft 20, main ratio gear shaft 30) for mounting reversing gear set 2 and main ratio gear set 3 may be pivotally mounted on these support walls by bearings, and so that reversing gear set 2 is located in first chamber S1, and main ratio gear set 3 and auxiliary ratio gear set 4 may be located in second chamber S2.

Wherein the intermediate support wall B2 can be integrally formed in the transmission housing K1, such as by integral casting and machining, so as to be able to reliably support the transmission components and avoid additional machining difficulties; the front and rear support walls B1, B3 are removably mounted (e.g., by fasteners) into the transmission housing K1, respectively, thereby facilitating mounting of the reversing gear set 2 and the main speed change gear set 3 into the first and second chambers S1, S2. In other embodiments, the intermediate support wall B2 may be formed separately from the transmission case K1 and integrally connected by fasteners.

In the preferred embodiment shown in the figures, the running gear power input shaft 1 is formed as a hollow shaft and is fitted over the PTO drive shaft 7, whereby the different functional modules for transmitting running power and working power in the transmission can be compactly arranged, avoiding taking up a large space and resulting in a heavy transmission.

The reversing gear set 2 may be provided in a suitable form to form a forward transmission path and a reverse transmission path. In the illustrated preferred embodiment, the reversing gear set 2 includes a forward output gear 21 and a reverse output gear 22 mounted on the running gear power input shaft 1, the forward output gear 21 and the reverse output gear 22 being controllable by a synchronizer to selectively engage to the running gear power input shaft 1 to transfer running power rearward by one of them. The forward output gear 21 is normally engaged with a traveling input gear 25 provided on the main transmission gear shaft 30 (the drive shaft 30 a), wherein the traveling input gear 25 is provided on a portion of the main transmission gear shaft 30 (the drive shaft 30 a) extending into the first chamber S1. Thus, when switching to such a state that the forward output gear 21 is engaged to the running gear power input shaft 1, the main transmission gear shaft 30 can be driven to rotate in the reverse direction with respect to the running gear power input shaft 1, and the wheels can be driven to rotate by the following running power output shaft 5, thereby realizing the forward movement of the tractor.

In the first chamber S1, there is further provided a reversing shaft 20 extending in parallel with the running gear power input shaft 1, and both ends of the reversing shaft 20 are pivotally mounted to the front support wall B1 and the intermediate support wall B2, respectively, on which there are mounted a reverse first transmission gear 23 normally meshed with the reverse output gear 22 and a reverse second transmission gear 24 normally meshed with the aforementioned running input gear 25. Thus, when the speed is switched so that the reverse output gear 22 is connected to the running gear power input shaft 1, the main speed gear shaft 30 can be driven to rotate in the same direction relative to the running gear power input shaft 1 through the reverse first transmission gear 23, the reversing shaft 20, the reverse second transmission gear 24 and the running input gear 25 in sequence, and then the wheels are driven to rotate through the subsequent running power output shaft 5, so that the reverse of the tractor is realized.

In a preferred embodiment of the transmission of the present utility model, the transmission assembly is provided with a primary speed gearset 3 and a secondary speed gearset 4 to enable a greater variety of gear ratios to be achieved in order for the tractor to accommodate a variety of different travel conditions. For this reason, a plurality of main change gear shafts 30 may be pivotally mounted at the intermediate support wall B2 and the rear support wall B3 so as to achieve multiple changes in speed through a plurality of sets of change gears during power transmission.

Specifically, as shown in connection with fig. 1, the main speed gear shaft 30 may include a driving shaft 30a and an intermediate shaft 30B extending in parallel with each other, wherein the driving shaft 30a may pass through the intermediate support wall B2 to mount the aforementioned travel input gear 25 for receiving the power transmitted from the reversing gear set 2 at a portion penetrating into the first chamber S1. A plurality of pairs of speed change gears 31a-31d may be provided on the drive shaft 30a and the intermediate shaft 30b and arranged to be located in the second chamber S2 so as to enable the intermediate shaft 30b to have different gear ratios with respect to the drive shaft 30a by switching the engagement relationship of the speed change gears 31a-31d with the drive shaft 30 a. It will be appreciated that although six pairs of ratio gears are shown on the drive shaft 30a and intermediate shaft 30b, the transmission of the present utility model may increase or decrease the number of pairs of ratio gears as desired, such as four pairs or eight pairs, etc. For clarity of illustration, only two pairs of adjacent speed change gears, namely, a first-speed drive gear 31a and a first-speed driven gear 31c which are in constant mesh with each other and a second-speed drive gear 31b and a second-speed driven gear 31d which are in constant mesh with each other, are labeled in fig. 1. Wherein the first-speed drive gear 31a and the second-speed drive gear 31b are provided on the drive shaft 30a and can be controlled by a synchronizer to be selectively engaged with the drive shaft 30 a; the first-speed driven gear 31c and the second-speed driven gear 31d are provided on the intermediate shaft 30b and are normally engaged with (e.g., spline-connected to or integrally formed with) the intermediate shaft 30b, respectively. Thus, when manipulated such that the first-speed drive gear 31a is engaged with the drive shaft 30a, the power transmitted from the drive shaft 30a can be transmitted to the intermediate shaft 30b through the first-speed driven gear 31 c; when manipulated such that the second-speed drive gear 31b is engaged with the drive shaft 30a, the power transmitted from the drive shaft 30a can be transmitted to the intermediate shaft 30b through the second-speed driven gear 31d.

In the illustrated preferred embodiment, as with the running gear power input shaft 1, the intermediate shaft 30B is also formed as a hollow shaft and is fitted over the PTO drive shaft 7 with both ends pivotally mounted to the intermediate support wall B2 and the rear support wall B3, respectively, by bearings. Thereby, the change gears 31a to 31d can be compactly arranged in the second chamber S2 with respect to the other parts, avoiding taking up a large space to cause the transmission to be heavy.

Further, some of the speed change gears 31a-31d on the intermediate shaft 30b may be part of a secondary speed change gear set 4, such as a secondary speed driven gear 31d in the illustration, which meshes with a high speed driven gear 43 provided on the traveling power output shaft 5 (rear axle drive shaft 51). Further, a low-speed drive gear 41 may be formed or mounted on the intermediate shaft 30b, and the low-speed drive gear 41 may have a smaller diameter and a smaller number of teeth than the aforementioned second-speed driven gear 31d, and mesh with a low-speed driven gear 42 provided on the traveling power output shaft 5 (rear axle drive shaft 51). In order to switch between high and low speeds, among others, a low-speed driven gear 42 and a high-speed driven gear 43 are provided to be selectively engaged to the traveling power output shaft 5 (rear axle drive shaft 51) where they are located, as by a synchronizer. Thus, when the low-speed driven gear 42 is engaged to the traveling power output shaft 5, the power transmitted from the intermediate shaft 30b is transmitted to the traveling power output shaft 5 through the low-speed drive gear 41 and the low-speed driven gear 42; when the high-speed driven gear 43 is engaged to the traveling power output shaft 5, the power transmitted from the intermediate shaft 30b is transmitted to the traveling power output shaft 5 through the second-speed driven gear 31d and the high-speed driven gear 43.

The transmission of the tractor may be provided with one or two walking power output shafts 5 to have a two-drive or four-drive or the like walking drive mode. The walking power output shaft 5 may be pivotally mounted on the front support wall B1, the intermediate support wall B2, and the rear support wall B3 in the transmission case K1 by bearings. In the illustrated preferred embodiment, the walking power output shaft 5 includes a rear axle drive shaft 51 and a front axle drive shaft 52, the low-speed driven gear 42 and the high-speed driven gear 43 in the aforementioned auxiliary speed change gear set 4 are mounted to the rear axle drive shaft 51, and the rear axle drive shaft 51 extends rearward through the rear support wall B3 for driving connection with the rear axle.

The rear axle drive shaft 51 is provided with a front axle drive shaft driving gear 61, and the front axle drive shaft 52 is provided with a front axle drive shaft driven gear 62 engaged with the front axle drive shaft driving gear 61. The front axle drive shaft 52 is pivotally mounted to the front and rear support walls B1 and B3, respectively, at spaced apart locations and extends forwardly through the front support wall B1 for driving connection to the front axle. Since the low-speed driven gear 42 in the sub-transmission gear set 4 and the front axle drive shaft driving gear 61 on the rear axle drive shaft 51 have relatively large dimensions, by arranging the front axle drive shaft 52 to be pivotally mounted to the rear support wall B3 at the second end of the transmission case K1, a space for disposing the low-speed driven gear 42 (and the high-speed driven gear 43) and the front axle drive shaft driving gear 61 can be left in the second chamber S2, avoiding the possibility of interference. Also, by providing the rear support wall B3 to be detachably connected to the transmission case K1, the disassembly and maintenance of these gear components can be facilitated.

A front axle drive disconnect unit (not shown) for shutting off the power transmission may be provided on the front axle drive shaft 52, so that the transmission of the engine power to the front axle can be shut off by the front axle drive disconnect unit as necessary, and the four-drive to two-drive switching can be achieved.

On the basis of this, the utility model also relates to a tractor provided with the transmission device of the tractor, wherein the first end of the transmission housing K1 of the transmission device is connected to the engine housing, and the end of the hydraulic pump mounting housing K2, which is far away from the transmission housing K1, is connected to the rear axle housing.

The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited thereto. Within the scope of the technical idea of the utility model, a number of simple variants of the technical solution of the utility model are possible, including combinations of individual specific technical features in any suitable way. The various possible combinations of the utility model are not described in detail in order to avoid unnecessary repetition. Such simple variations and combinations are likewise to be regarded as being within the scope of the present disclosure.

Claims (10)

1. A transmission for a tractor, comprising:

a transmission assembly comprising a transmission housing (K1), the transmission housing (K1) having a first end for connection to a drive device and a second end opposite the first end;

a hydraulic pump mounting housing (K2), the hydraulic pump mounting housing (K2) being detachably connected to a second end of the transmission housing (K1) and provided with a driven bevel gear shaft mounting seat (84) and a hydraulic pump mounting seat (81) coaxially provided with each other, the driven bevel gear shaft mounting seat (84) being pivotally mounted with a driven bevel gear shaft (83) provided with a driven bevel gear (85); and

a PTO drive shaft (7), the PTO drive shaft (7) extending through the transmission housing (K1) and the hydraulic pump mounting housing (K2) and being provided with a drive bevel gear (86) at a portion penetrating into the hydraulic pump mounting housing (K2), the drive bevel gear (86) being engaged with the driven bevel gear (85) so as to be able to transmit rotational power of the PTO drive shaft (7) to a hydraulic pump mounted to the hydraulic pump mounting seat (81).

2. The transmission device of a tractor according to claim 1, wherein a top wall of the hydraulic pump mounting housing (K2) protrudes downward to form the driven bevel gear shaft mounting seat (84), the hydraulic pump mounting seat (81) is disposed on a side wall of the hydraulic pump mounting housing (K2), and a spline housing (82) with both ends respectively connected to the driven bevel gear shaft (83) and the hydraulic pump is disposed between the hydraulic pump mounting seat (81) and the driven bevel gear shaft mounting seat (84).

3. A tractor transmission according to claim 1, characterized in that the second end of the transmission housing (K1) is provided with a rear support wall (B3), which rear support wall (B3) is formed with a drive bevel gear support (87) on the side facing the hydraulic pump mounting housing (K2), through which drive bevel gear support (87) the PTO drive shaft (7) extends into the hydraulic pump mounting housing (K2) and causes the drive bevel gear (86) to be rotatably supported in the drive bevel gear support (87).

4. A tractor transmission according to claim 3, characterized in that the transmission assembly comprises a travelling power input shaft (1) extending through the first end of the transmission housing (K1), a reversing gear set (2) and a main gear set (3) provided in the transmission housing (K1), and a travelling power output shaft (5) drivingly connected to the travelling power input shaft (1) by the reversing gear set (2) and the main gear set (3), the reversing gear set (2) being switchable such that the travelling power output shaft (5) rotates in different directions, the main gear set (3) being switchable such that the travelling power output shaft (5) has different gear ratios with respect to the travelling power input shaft (1).

5. The transmission of a tractor according to claim 4, characterized in that an intermediate support wall (B2) spaced from the rear support wall (B3) and a front support wall (B1) disposed closer to the first end than the intermediate support wall (B2) are provided in the transmission case (K1) to divide an inner cavity of the transmission case (K1) by the intermediate support wall (B2) into a first chamber (S1) relatively close to the first end and a second chamber (S2) relatively close to the second end, the reversing gear set (2) being mounted in the first chamber (S1), and the main gear set (3) being pivotally mounted by both ends in the intermediate support wall (B2) and a main gear shaft (30) of the rear support wall (B3) respectively, being mounted in the second chamber (S2).

6. The transmission of a tractor according to claim 5, characterized in that the front support wall (B1) and the rear support wall (B3) are each detachably mounted into the transmission housing (K1), the intermediate support wall (B2) being integrally formed in the transmission housing (K1).

7. The transmission of a tractor according to claim 5, wherein the running gear power input shaft (1) is sleeved on the PTO drive shaft (7), and the reversing gear set (2) includes: a forward output gear (21) and a reverse output gear (22) mounted and selectively coupled to the running gear power input shaft (1), a reverse first transmission gear (23) and a reverse second transmission gear (24) mounted by a reversing shaft (20) extending in parallel with the running gear power input shaft (1) and pivotally mounted to the front support wall (B1) and the middle support wall (B2), respectively, at both ends, and a running input gear (25) provided on a portion of the main transmission gear shaft (30) extending into the first chamber (S1), wherein the reverse first transmission gear (23) is engaged with the reverse output gear (22), and the running input gear (25) is simultaneously engaged with the forward output gear (21) and the reverse second transmission gear (24) to be switchable to rotate the running input gear (25) in different directions.

8. The transmission device of a tractor according to claim 5, characterized in that the main speed gear shaft (30) includes a driving shaft (30 a) and an intermediate shaft (30 b) extending in parallel with each other, the main speed gear set (3) includes a plurality of pairs of speed gears (31 a-31 d) provided on the driving shaft (30 a) and the intermediate shaft (30 b) that mesh with each other so as to enable the intermediate shaft (30 b) to have different transmission ratios with respect to the driving shaft (30 a) by switching engagement relationships of the speed gears (31 a-31 d) with the driving shaft (30 a); and, in addition, the processing unit,

the transmission assembly comprises a secondary speed change gear set (4), wherein the secondary speed change gear set (4) comprises a low-speed driven gear (42) and a high-speed driven gear (43) which are installed and selectively connected to the walking power output shaft (5), and the low-speed driven gear (42) and the high-speed driven gear (43) are respectively meshed with a low-speed driving gear (41) and one of the speed change gears (31 a-31 d) arranged on the intermediate shaft (30 b).

9. The transmission of a tractor according to claim 8, characterized in that the walking power output shaft (5) comprises a rear axle drive shaft (51) and a front axle drive shaft (52), the low-speed driven gear (42) and the high-speed driven gear (43) are provided on the rear axle drive shaft (51), and a front axle drive shaft driving gear (61) is provided on the rear axle drive shaft (51), the front axle drive shaft (52) being pivotally mounted to the front support wall (B1) and the rear support wall (B3) at positions spaced apart from each other, respectively, and a front axle drive shaft driven gear (62) engaged with the front axle drive shaft driving gear (61) being provided.

10. A tractor provided with a transmission according to any one of claims 1 to 9.

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