Connection transmission structure for engine and gearbox of full-frame tractor

Abstract

A connection transmission structure of an engine and a gearbox of a full-frame tractor comprises the engine, and an engine flywheel shell is arranged at the rear end of the engine. The power transmission case further comprises a power transmission case shell and a universal joint transmission shaft, the power transmission case shell is fixedly installed on the engine flywheel shell, a transmission shaft is arranged in the power transmission case shell, the front end of the transmission shaft is connected to an engine flywheel through a clutch or a torsion damper, and a first connecting flange is fixedly arranged at the rear end of the transmission shaft. The front end of the universal joint transmission shaft is provided with a first flange plate and fixedly connected with the first connecting flange through the first flange plate, and the rear end of the universal joint transmission shaft is provided with a second flange plate and fixedly connected with the input end of the gearbox through the second flange plate. According to the utility model, the maintenance is more convenient, the position precision tolerance of the fixed engine and gearbox on the frame is reduced, the production and processing difficulty is reduced, and the production and processing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery, in particular to a connecting transmission structure of a full-frame tractor engine and a gearbox. Background Art

[0002] Existing tractors use front-wheel steering and bent-back steering. Front-wheel steering tractors have a variety of frame types: frameless, full-frame, and semi-frame. The inventors conducted research on full-frame tractors and found that traditional full-frame tractors use a gearbox that is directly fixed to the engine's flywheel housing, forming a rigid whole with the engine.

[0003] This leads to the following problems:

[0004] 1. Since the power equipment of the full-frame tractor is an integral structure, it is inconvenient to maintain. When a problem occurs, the rigid structure of the engine and gearbox must be removed from the frame first, which greatly increases the difficulty and prolongs the maintenance time during the maintenance process, especially during the busy farming season, seriously affecting the efficiency of agricultural machinery operations.

[0005] 2. At the same time, the engine and gearbox housings are processed in the machining center with high precision, while the integral frame is welded on the tooling and has welding deformation. In addition, due to the large size of the frame, the fixed position of the engine and gearbox on the frame cannot be processed after welding, resulting in a large error between the actual and theoretical dimensions. In production, deformation is inevitable. Therefore, it is necessary to repeatedly use adjustment shims to eliminate the tolerance of the frame in order to fix the rigidity of the tractor engine and gearbox to the frame as a whole to avoid the influence of stress. Utility Model Content

[0006] In order to overcome the above-mentioned defects of the prior art, the inventors have conducted in-depth research and completed the present utility model after paying a lot of creative work.

[0007] Specifically, the technical problem to be solved by the present invention is to provide a connecting transmission structure for the engine and gearbox of a full-frame tractor, so as to solve the technical problems that the current full-frame tractors are inconvenient to maintain and the frame needs to be adjusted multiple times during production and processing to adapt to the overall rigid structure of the engine and gearbox, which increases the difficulty of production.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0009] A connecting transmission structure of a full-frame tractor engine and a gearbox, comprising

[0010] An engine, wherein the engine is fixedly mounted on the front end of the tractor frame, and an engine flywheel housing is provided on the rear end of the engine;

[0011] A gearbox, which is fixedly mounted on the middle section of the tractor frame;

[0012] The utility model also includes

[0013] A power transmission case housing, the power transmission case housing being fixedly mounted on the engine flywheel housing, and a transmission shaft being disposed within the power transmission case housing, the front end of the transmission shaft being connected to the engine flywheel via a clutch or a torsional damper, and the rear end of the transmission shaft being fixedly provided with a first connecting flange;

[0014] And a universal joint transmission shaft, the front end of the universal joint transmission shaft is provided with a first flange, which is fixedly connected to the first connecting flange by using the first flange, and the rear end of the universal joint transmission shaft is provided with a second flange, which is fixedly connected to the input end of the gearbox by using the second flange.

[0015] In the present invention, as an improved technical solution, a power input gear shaft is provided at the input end of the gearbox, a second connecting flange is provided at the front end of the power input gear shaft, and the second connecting flange is fixedly connected to the second flange plate by using the second connecting flange.

[0016] In the present invention, as an improved technical solution, bolt holes are arranged in a circle on the first connecting flange and the second connecting flange, and are fixedly connected to the first flange plate and the second flange plate respectively by fixing bolts.

[0017] In the present invention, as an improved technical solution, the rear end of the transmission shaft and the front end of the power input gear shaft are both provided with flange mounting structures, and the first connecting flange and the second connecting flange are respectively fixedly assembled using the flange mounting structures.

[0018] In the present invention, as an improved technical solution, the flange mounting structure includes an internal spline arranged on the inner surfaces of the first connecting flange and the second connecting flange, and an external spline arranged at the rear end of the transmission shaft and the front end of the power input gear shaft. The internal spline and the external spline are assembled in cooperation.

[0019] In the present invention, as an improved technical solution, the flange mounting structure of the second connecting flange also includes a flange pressure plate and a clamping bolt. The inner ring of the second connecting flange is provided with a clamping step. The flange pressure plate is pressed against the surface of the clamping step and is fixed and installed using the clamping bolt.

[0020] In the present invention, as an improved technical solution, an axial screw hole is provided at the front end of the power input gear shaft, and the axial screw hole is adapted to the clamping bolt.

[0021] After adopting the above technical solution, the beneficial effects of the utility model are:

[0022] 1. The present invention provides a universal joint drive shaft, which is used to connect the engine and the gearbox, thereby improving the traditional integral rigid structure of the engine and gearbox connection structure into an independent structure that is easy to disassemble. In other words, the engine part and the gearbox part are transformed into two relatively independent components. When a problem occurs in one of the components, the universal joint drive shaft can be disassembled, and then the problematic engine or gearbox can be disassembled and lifted out for repair. This improves the convenience of mechanical maintenance, improves maintenance efficiency, and reduces maintenance time. At the same time, during processing and production, the problem of the overall structure having extremely strict requirements on frame dimensional errors and deformation is avoided. Even if the frame has dimensional errors or deformations within a certain limit, the universal joint drive shaft connection has a certain degree of adaptability and buffering effect, so that assembly can still be completed smoothly, avoiding the influence of stress, and allowing for subsequent correction.

[0023] 2. In order to adapt to the technical requirements of full-frame tractors and ensure the convenience of disassembly and assembly of the universal joint drive shaft connection, the utility model provides a first flange and a second flange at both ends of the universal joint drive shaft. The first flange and the second flange are used to realize flange connection and assembly with the rear end of the drive shaft and the front end of the power input gear shaft. When disassembly is required, the bolts on the flange are directly removed, and the engine and gearbox can be conveniently disassembled into two independent parts, which is convenient for the next step of maintenance.

[0024] 3. To meet the technical requirements of full-frame tractors and ensure the reliability of the universal joint drive shaft connection, the present invention features a flange mounting structure. This structure connects the rear end of the drive shaft and the front end of the power input gear shaft to both ends of the universal joint drive shaft. The flange mounting structure utilizes internal and external splines for circumferential restriction, while the second connecting flange utilizes a flange pressure plate for axial restriction. This ensures reliable positioning of the connecting flange in both radial and circumferential directions, enhancing installation reliability. Furthermore, the first connecting flange lacks a flange pressure plate, providing a certain margin for assembly convenience.

[0025] In summary, the utility model changes the integral connection structure of the engine and gearbox of the traditional full-frame tractor, making maintenance more convenient. At the same time, it reduces the position accuracy tolerance of the fixed engine and gearbox on the frame, reduces the difficulty of production and processing, and improves production and processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. Among them:

[0027] Figure 1 The utility model is a schematic diagram of the overall three-dimensional structure of the easily detachable power mechanism of the full-frame tractor.

[0028] Figure 2 The utility model is a tractor with a fully detachable power mechanism. Figure 1 Schematic diagram of the structure of the enlarged view of A in the figure.

[0029] Figure 3 It is a structural schematic diagram of the connecting flange of the utility model.

[0030] Figure 4 It is a schematic diagram of the cross-sectional structure of the connecting flange of the utility model.

[0031] Figure 5 This is a schematic diagram of the installation structure of the connecting flange of the utility model.

[0032] Figure 6 This is a schematic diagram of the internal structure of the power transmission box housing of the present utility model.

[0033] Figure 7 This is a schematic diagram of the universal joint transmission shaft structure of Example 2 of the present utility model.

[0034] Description of reference numerals:

[0035] 1. Vehicle frame; 2. Engine; 21. Engine flywheel housing; 3. Gearbox; 31. Power input gear shaft; 4. Universal joint drive shaft; 41. Universal joint body; 42. Connecting frame No. 1; 43. Connecting rod No. 1; 44. Connecting block; 45. Connecting rod No. 2; 46. Connecting frame No. 2; 47. Second flange; 48. Fixing bolts; 49. First flange; 5. Rear drive axle; 6. Rear power output box; 7. Power transmission box housing; 71. Drive shaft; 8. First connecting flange; 81. Bolt hole; 9. Second connecting flange; 91. Clamping step; 10. Flange pressure plate; 11. Clamping bolts. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or an option in which both A and B are satisfied.

[0039] In addition, in this utility model, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0040] Example 1

[0041] like Figures 1-6The figure shows a transmission structure connecting an engine and a gearbox for a full-frame tractor, comprising an engine 2, a gearbox 3, a power transmission case housing 7, and a universal joint drive shaft 4. The engine is fixedly mounted on the front end of the tractor frame 1, and an engine flywheel housing 21 is provided at the rear end of the engine. The gearbox 3 is mounted in the middle section of the frame 1, and the power transmission case housing 7 is fixedly mounted on the engine flywheel housing 21. A drive shaft 71 is disposed within the power transmission case housing. The front end of the drive shaft is connected to the engine flywheel via a clutch or a torsional damper (this structure is known and not shown in the figure). The rear end of the drive shaft 71 is fixedly provided with a first connecting flange 8. The front end of the universal joint drive shaft 4 is provided with a first flange 49, which is fixedly connected to the first connecting flange 8. The rear end of the universal joint drive shaft 4 is provided with a second flange 47, which is fixedly connected to the input end of the gearbox 3. In this embodiment, the universal joint drive shaft 4 is a cross-axis universal joint. This embodiment utilizes a universal joint drive shaft to connect the drive shaft to the transmission power, thereby improving the traditional integral power equipment into an easily disassembled independent structure. Specifically, the engine and transmission parts are transformed into two relatively independent components. If a problem occurs with one of these components, the universal joint drive shaft can be disassembled, and the problematic engine or transmission can then be removed and hoisted out for repair. This improves the convenience and efficiency of mechanical maintenance, reducing repair time. Furthermore, during production, the problem of the integral structure requiring extremely stringent requirements for frame dimensional errors and deformation is avoided. Even if the frame exhibits dimensional errors or deformation within certain limits, the universal joint drive shaft connection has a certain degree of adaptability and buffering effect, allowing for smooth assembly, avoiding the effects of stress, and allowing for subsequent correction.

[0042] In the present invention, the right side of the gearbox 3 is equipped with a rear drive axle 5 through a universal joint transmission shaft. The right side of the gearbox 3 and away from the rear drive axle 5 are equipped with a rear power output box 6 through a universal joint transmission shaft.

[0043] In this embodiment, a power input gear shaft 31 is provided at the input end of the gearbox 3 , a second connecting flange 9 is provided at the front end of the power input gear shaft 31 , and the second connecting flange is fixedly connected to the second flange plate via the second connecting flange.

[0044] Specific as Figure 3 As shown, in this embodiment, the first connecting flange 8 and the second connecting flange 9 are provided with bolt holes 81 arranged in a circle, and are fixedly connected to the first flange and the second flange respectively by fixing bolts 48. Figure 3The first connecting flange is used as an example. This installation structure ensures the convenience of disassembly and assembly, as well as the reliability of the connection. When disassembly is required, simply remove the bolts on the flange to easily separate the engine and gearbox into two independent parts, making it easier for the next maintenance.

[0045] To meet the technical requirements of full-frame tractors and ensure the reliability of the universal joint drive shaft connection, flange mounting structures are provided at the rear end of the drive shaft 71 and the front end of the power input gear shaft 31. The first and second connecting flanges are respectively secured together using the flange mounting structures. The flange mounting structures include internal splines provided on the inner surfaces of the first and second connecting flanges, and external splines provided at the rear end of the drive shaft and the front end of the power input gear shaft. These internal and external splines are assembled in a coordinated manner. Figure 5 The flange mounting structure of the second connecting flange further comprises a flange pressing plate and a tightening bolt, such as Figure 4 As shown, the inner ring of the second connecting flange is provided with a clamping step 91, and the flange pressure plate 10 is pressed against the surface of the clamping step and fixed with the clamping bolts 11. The flange mounting structure utilizes the cooperation of internal and external splines to achieve circumferential restriction, and the flange pressure plate for axial restriction, thereby achieving reliable positioning and restriction of the connecting flange in both radial and circumferential directions, thereby enhancing installation reliability. The first connecting flange does not have a flange pressure plate and only uses internal and external splines for assembly, which provides a certain degree of free play in the assembly mechanism and is more convenient during production and assembly.

[0046] When repairing the full-frame tractor of this embodiment, if there is a problem with the gearbox, the staff will remove the fixing bolts connecting the second connecting flange and the second flange plate, and the gearbox and the engine will become two independent parts. At this time, it is only necessary to remove the gearbox from the frame and hoist it out for repair.

[0047] Example 2

[0048] like Figure 7As shown, the universal joint transmission shaft 4 of this embodiment employs a specific structure: it includes a universal joint body 41, with a first connecting bracket 42 fixedly mounted on both sides of the universal joint body 41. A first connecting rod 43 is fixedly mounted on the inner surface of the first connecting bracket 42, and a connecting block 44 is fixedly mounted on the outer surface of the first connecting rod 43. The universal joint transmission shaft 4 also includes a second connecting rod 45, the outer surface of which is rotatably connected to the inner surface of the connecting block 44. A second connecting bracket 46 is fixedly mounted on the outer surface of the second connecting rod 45. The two second connecting brackets 46 are respectively provided with a first connecting flange and a second connecting flange on the side facing away from each other. The first and second connecting flanges are integrally cast with the two second connecting brackets 46. This universal joint transmission shaft 4 utilizes its structural features to achieve continuous rotation of the two shafts, even when the two shafts are not coaxial or at an angle to each other, and reliably transmit torque and motion. Its most significant feature is its high angular compensation capability, which can maintain transmission stability within a certain angle range.

[0049] It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of protection of the present invention. In addition, it should be understood that after reading the technical content of the present invention, those skilled in the art may make various changes, modifications and / or variations to the present invention, and all such equivalent forms also fall within the scope of protection defined by the appended claims.

Claims

1. A connecting transmission structure of a full-frame tractor engine and a gearbox, comprising An engine, wherein the engine is fixedly mounted on the front end of the tractor frame, and an engine flywheel housing is provided on the rear end of the engine; A gearbox, which is fixedly mounted on the middle section of the tractor frame; Its characteristics are: Also includes A power transmission case housing, the power transmission case housing being fixedly mounted on the engine flywheel housing, and a transmission shaft being disposed within the power transmission case housing, the front end of the transmission shaft being connected to the engine flywheel via a clutch or a torsional damper, and the rear end of the transmission shaft being fixedly provided with a first connecting flange; And a universal joint transmission shaft, the front end of the universal joint transmission shaft is provided with a first flange, which is fixedly connected to the first connecting flange by using the first flange, and the rear end of the universal joint transmission shaft is provided with a second flange, which is fixedly connected to the input end of the gearbox by using the second flange.

2. The connecting transmission structure of a full-frame tractor engine and a gearbox according to claim 1, characterized in that: The input end of the gearbox is provided with a power input gear shaft, the front end of the power input gear shaft is provided with a second connecting flange, and the second connecting flange is fixedly connected to the second flange plate.

3. The connecting transmission structure of the engine and gearbox of a full-frame tractor according to claim 2, characterized in that: Bolt holes are arranged in a circle on the first connecting flange and the second connecting flange, and are fixedly connected to the first flange plate and the second flange plate respectively by fixing bolts.

4. The connecting transmission structure of a full-frame tractor engine and a gearbox as claimed in claim 3, characterized in that: The rear end of the transmission shaft and the front end of the power input gear shaft are both provided with flange mounting structures, and the first connecting flange and the second connecting flange are respectively fixedly assembled by using the flange mounting structures.

5. The connecting transmission structure of the engine and gearbox of a full-frame tractor according to claim 4, characterized in that: The flange mounting structure includes internal splines arranged on the inner surfaces of the first and second connecting flanges, and external splines arranged on the rear end of the transmission shaft and the front end of the power input gear shaft. The internal splines and the external splines are assembled in cooperation.

6. The connecting transmission structure of the engine and gearbox of a full-frame tractor according to claim 5, characterized in that: The flange mounting structure of the second connecting flange also includes a flange pressure plate and a clamping bolt. The inner ring of the second connecting flange is provided with a clamping step. The flange pressure plate is pressed against the surface of the clamping step and is fixedly installed using the clamping bolt.

7. The connecting transmission structure of the engine and gearbox of a full-frame tractor according to claim 6, characterized in that: An axial screw hole is provided at the front end of the power input gear shaft, and the axial screw hole is adapted to the clamping bolt.

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