Intermediate shaft assembly, gearbox and transmission system

Abstract

The utility model provides an intermediate shaft assembly, a gearbox and a transmission system, and relates to the field of gearboxes. The intermediate shaft assembly comprises an intermediate shaft, a supporting bearing and a plurality of intermediate shaft blocking gears, the intermediate shaft comprises N stages of short shafts, and the N stages of short shafts are sequentially and coaxially connected; wherein N is a positive integer, and N is greater than or equal to 2; two ends of the first-stage short shaft are respectively provided with a support bearing, and one end, far away from the Nth-stage short shaft, of the (N + 1) th-stage short shaft is provided with a support bearing; and a plurality of intermediate shaft gear gears are distributed on the N-stage short shaft. According to the intermediate shaft assembly, the intermediate shaft is formed by assembling the multiple shaft sections, the supporting bearings are arranged on the short shafts, and the intermediate shaft blocking gears are distributed on the short shafts, so that the rigidity of the intermediate shaft can be improved, the meshing state of the gears on the intermediate shaft is improved, the service life of the gears is prolonged, and the service life of the gears is prolonged. And the mounting difficulty can be reduced by only mounting the supporting bearing at the end part of the short shaft, so that time and labor are saved.

Description

Technical Field

[0001] The utility model relates to the field of gearboxes, in particular to an intermediate shaft assembly, a gearbox and a transmission system. Background Art

[0002] The intermediate shaft of the traditional gearbox intermediate shaft assembly is fixed and supported by support bearings at both ends. This method results in poor rigidity of the intermediate shaft, and the reliability of the gearbox cannot meet the requirements of rough driving scenarios. In order to improve the rigidity of the intermediate shaft, most of them add support bearings in the middle of the intermediate shaft, but this method has the following problems:

[0003] Since the support bearing and the intermediate shaft are interference fit, installing the support bearing in the middle of the support bearing is relatively complicated, time-consuming and laborious. Utility Model Content

[0004] In view of this, the purpose of the utility model is to overcome the deficiencies in the prior art and to provide an intermediate shaft assembly, a gearbox and a transmission system, which can reduce the difficulty of installing a support bearing in the middle of the intermediate shaft on the basis of increasing the rigidity of the intermediate shaft, thereby saving time and effort in installation.

[0005] The utility model provides the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides an intermediate shaft assembly, the intermediate shaft assembly comprising:

[0007] An intermediate shaft, the intermediate shaft comprising N levels of short shafts, the N levels of short shafts being coaxially connected in sequence; wherein N is a positive integer, and N≥2;

[0008] Support bearings, the two ends of the short shaft of the first stage are respectively installed with the support bearings, and the end of the short shaft of the N+1 stage away from the short shaft of the N stage is installed with the support bearing;

[0009] A plurality of intermediate shaft gears are provided, and the plurality of intermediate shaft gears are distributed on the N-stage short shafts.

[0010] In one embodiment of the first aspect, an end surface of one end of one of the adjacent short shafts has a groove, and an end surface of one end of the other short shaft has an insert portion, and the insert portion can be inserted into the groove.

[0011] In one embodiment of the first aspect, the groove portion and the plug portion are key-connected.

[0012] In one of the embodiments of the first aspect, the structure of the groove located at the end of the intermediate shaft defines a power take-off interface.

[0013] In one embodiment of the first aspect, the plurality of intermediate shaft gears include:

[0014] An intermediate shaft reverse gear is mounted on the stub shaft at the end of the intermediate shaft.

[0015] In a second aspect, an embodiment of the present application provides a gearbox, which includes an intermediate shaft assembly as described in any of the above embodiments.

[0016] In one embodiment of the second aspect, the gearbox further comprises:

[0017] A power output shaft assembly comprises a power output shaft and a retarder gear, wherein the retarder gear is mounted on the power output shaft, and the retarder gear and the intermediate shaft reverse gear are located at the same end of the power output shaft.

[0018] In one embodiment of the second aspect, the power output shaft assembly includes:

[0019] A shift sleeve, wherein the shift sleeve has external splines;

[0020] The power output shaft stop gear has an internal spline, and the internal spline can mesh with the external spline.

[0021] In one embodiment of the second aspect, outer edges of opposite ends of the shift sleeve are both provided with chamfers.

[0022] In a third aspect, an embodiment of the present application provides a transmission system, which includes a gearbox as described in any of the above embodiments.

[0023] The embodiments of the present utility model have the following advantages:

[0024] The intermediate shaft assembly provided by the utility model can increase the rigidity of the intermediate shaft to improve the meshing state of the gears on the intermediate shaft and increase the life of the gears by setting the intermediate shaft to be assembled from multiple shaft sections, setting support bearings on each short shaft, and distributing multiple intermediate shaft gears on multiple short shafts, thereby reducing the difficulty of installation by only installing the support bearings on the ends of the short shafts, saving time and effort. In addition, since the multiple intermediate shaft gears are distributed on multiple short shafts, it is convenient to subsequently disassemble the short shaft where the intermediate shaft gear with problems is located without disassembling the entire intermediate shaft; and, by assembling multiple short shafts separately, the assembly difficulty of the intermediate shaft assembly and the output shaft assembly to the gear ring is reduced.

[0025] In addition, the utility model also relates to a gearbox. Since the above-mentioned intermediate shaft assembly has the above-mentioned technical effects, the gearbox including the intermediate shaft assembly should have the same technical effects, which will not be described in detail here.

[0026] In addition, the utility model also relates to a transmission system. Since the above-mentioned gearbox has the above-mentioned technical effects, the transmission system including the gearbox should have the same technical effects, which will not be repeated here.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of an internal shaft system of a gearbox provided by an embodiment of the utility model is shown;

[0030] Figure 2 A schematic structural diagram of one of the adjacent short circuits provided in an embodiment of the utility model is shown;

[0031] Figure 3 A schematic structural diagram of another short circuit in adjacent short circuits provided by an embodiment of the utility model is shown;

[0032] Figure 4 A schematic structural diagram of a gear shift sleeve of a transmission provided by an embodiment of the utility model is shown.

[0033] Description of main component symbols:

[0034] 100-support bearing; 200-intermediate shaft; 210-short shaft; 211-groove; 212-plug-in portion; 300-intermediate shaft gear; 310-intermediate shaft reverse gear; 400-power output shaft assembly; 410-shift sleeve; 411-external spline; 412-chamfer; 420-power output shaft gear; 430-retarder gear. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying 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 one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the template herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0040] In the relevant technologies, off-road wide-body dump trucks and off-road mining dump trucks are heavy-duty dump trucks designed and used in off-road environments, and are mainly used in specific off-road working conditions, such as open-pit mines, large construction sites, ports and docks, etc. Working characteristics: short haul, heavy load, able to withstand high loads, continuous operation and harsh working conditions, such as muddy, steep slopes, gravel roads, etc.

[0041] Off-road wide-body dump trucks and off-road mining dump trucks have harsh working conditions and drivers have rough driving styles, with situations such as not releasing the clutch to engage gears or skipping gears. These situations place very high demands on the reliability of the gearbox.

[0042] Due to the limitation of the internal space of the gearbox, the intermediate shaft of the intermediate shaft assembly of the traditional gearbox is fixed and supported by bearings at both ends. This method results in poor rigidity of the intermediate shaft, and thus the reliability of the gearbox cannot meet the requirements of rough driving scenarios.

[0043] like Figure 1 , Figure 2 and Figure 3 As shown, in order to solve the above technical problems, the preferred embodiment provided by the utility model provides an intermediate shaft assembly according to the embodiment of the present application, wherein the intermediate shaft assembly includes an intermediate shaft 200, a support bearing 100 and a plurality of intermediate shaft gears 300, the intermediate shaft 200 includes N-stage short shafts 210, and the N-stage short shafts 210 are coaxially connected in sequence; wherein N is a positive integer, and N≥2; support bearings 100 are respectively installed at both ends of the first-stage short shaft 210, wherein a support bearing 100 is installed at one end of the N+1-stage short shaft 210 away from the N-stage short shaft 210; and a plurality of intermediate shaft gears 300 are distributed on the N-stage short shafts 210.

[0044] In this embodiment, the intermediate shaft 200 is configured to be composed of multiple short shafts 210 coaxially connected in series, and support bearings 100 are provided at both ends of the first-stage short shaft 210, and other short shafts 210 except the first-stage short shaft 210 each have a support bearing 100, thereby improving the structural strength and rigidity of the intermediate shaft 200.

[0045] It is easy to understand that the first stage short shaft 210 is located at the end of the intermediate shaft 200, and the support bearings 100 are installed at both ends of the first stage short shaft 210, and the remaining short shafts 210 are provided with support bearings 100 at one end away from the first stage short shaft 210, thereby enabling each short shaft 210 to be supported at both ends, so as to increase the rigidity of each short shaft 210, that is, to enhance the rigidity of the intermediate shaft 200. Among them, since the other short shafts 210 other than the first stage short shaft 210 are only provided with one support bearing 100, the volume of the gearbox and the axial length of the intermediate shaft 200 can be reduced.

[0046] For example, Figure 1 As shown, the intermediate shaft 200 includes a 2-stage short shaft 210, that is, the entire central shaft only needs to be installed with three support bearings 100. Of course, in other embodiments, the intermediate shaft 200 may include a 2-stage short shaft 210, a 3-stage short shaft 210, a 4-stage short shaft 210, a 5-stage short shaft 210, a 6-stage short shaft 210, etc., which are not specifically limited here. Specifically, the number of short shafts may be increased according to the actual length of the intermediate shaft 200 and the space of the gearbox.

[0047] The intermediate shaft assembly provided by the utility model is used. By setting the intermediate shaft 200 to be assembled from multiple shaft sections, supporting bearings 100 are set on each short shaft 210, and multiple intermediate shaft gears 300 are distributed on multiple short shafts 210, the rigidity of the intermediate shaft 200 can be increased to improve the meshing state of the gears on the intermediate shaft 200 and increase the life of the gears. The supporting bearings 100 can also be installed only on the ends of the short shafts 210 to reduce the difficulty of installation, saving time and effort. In addition, since multiple intermediate shaft gears 300 are distributed on multiple short shafts 210, it is convenient to disassemble the short shaft 210 where the intermediate shaft gear 300 with problems is located later, without disassembling the entire intermediate shaft 200; and, by assembling multiple short shafts 210 separately, the assembly difficulty of the intermediate shaft assembly and the output shaft assembly to the gear ring is reduced.

[0048] It should be noted that, since the multi-stage short shafts 210 are assembled step by step, that is, the gears of the multiple intermediate shaft gears 300 can be aligned one by one. Of course, since the intermediate shaft 200 is provided as a multi-stage short shaft 210, when the intermediate shaft gears 300 on each short shaft 210 are aligned, the weight of a single short shaft 210 is lighter than that of the entire intermediate shaft 200, and the number of the intermediate shaft gears 300 on a single short shaft 210 is less than that of the entire intermediate shaft 200, so it is more convenient to align the gears.

[0049] like Figure 2 and Figure 3 As shown, in some embodiments, an end surface of one end of one of the adjacent short shafts 210 has a groove portion 211 , and an end surface of another short shaft 210 has an insert portion 212 , and the insert portion 212 can be inserted into the groove portion 211 .

[0050] That is to say, the insertion of the groove portion 211 and the plug-in portion 212 can replace the use of connecting parts to connect adjacent short shafts 210, which has the effect of saving the internal space of the gearbox and shortening the axial length of the intermediate shaft 200. Of course, reducing the use of connecting parts can not only reduce costs, but also improve the performance stability of the gearbox.

[0051] Exemplarily, the end face of one of the two opposite ends of the short shaft 210 has a groove portion 211, and the end face of the other end has a plug-in portion 212. The groove portion 211 of one short shaft 210 and the plug-in portion 212 of the other short shaft 210 in adjacent short shafts 210 are arranged relative to each other, so that the adjacent short shafts 210 can be connected by plugging between the groove portion 211 and the plug-in portion 212.

[0052] It should be noted that since the connection between the plug-in portion 212 and the groove portion 211 does not have a portion protruding from the side wall of the short shaft 210, that is, the connection between the plug-in portion 212 and the groove portion 211 does not occupy the axial space of the intermediate shaft 200, the length of the intermediate shaft 200 can be reduced and a miniaturized gearbox can be used.

[0053] For example, a hole groove is provided on the end surface of one end of the short shaft 210, the hole groove extends along the axial direction of the short shaft 210, and the hole groove forms a groove portion 211; a columnar protrusion is provided on the end surface of the other end of the short shaft 210, the columnar protrusion extends along the axial direction of the short shaft 210, and the columnar protrusion forms a plug-in portion 212. Optionally, the hole groove can be a circular groove, a square groove, an elliptical groove, a triangular groove, a conical groove, etc., which is not specifically limited here.

[0054] Of course, the columnar protrusions may be cylindrical protrusions, prismatic protrusions, elliptical cylindrical protrusions, frustum-shaped protrusions, and the like.

[0055] Illustratively, the plug-in portion 212 is connected to the groove portion 211 via a bolt or a pin.

[0056] like Figure 2 and Figure 3 As shown, in some embodiments, the groove portion 211 and the plug portion 212 are keyed.

[0057] That is to say, the groove portion 211 and the plug portion 212 can be connected in a transmission manner without adding an additional fixing component, which can be a bolt, a pin, etc., thereby saving costs, reducing installation difficulty, and improving installation efficiency. Obviously, the above structural setting is conducive to the rapid disassembly and assembly of the short shaft 210, and can also ensure that large torque can be transmitted between adjacent short shafts 210.

[0058] For example, the end faces of adjacent short shafts 210 are arranged in abutment with each other, so that the torque can be transmitted through the friction force of the connection, thereby reducing the torque (or load) acting on the plug-in portion 212 and the groove portion 211 .

[0059] For example, the key connection is a spline connection, which has a high load-bearing capacity and centering performance, and is suitable for occasions requiring high precision and centering performance. Of course, in other embodiments, the key connection can also be a flat key connection, a semicircular key connection, a wedge key connection, a tangential key connection, etc.

[0060] In some embodiments, the hole groove is prismatic, and the columnar protrusion is also prismatic, and both can also transmit torque to form a key connection. Therefore, the key connection is not limited to the traditional chain connection structure.

[0061] In some embodiments, the structure of the groove portion 211 located at the end of the intermediate shaft 200 defines a power take-off interface.

[0062] That is to say, on the basis of the key connection between the groove portion 211 and the plug-in portion 212, the connection between the power shaft of the power take-off and the groove portion 211 is also set to be a key connection, thereby simplifying the structure.

[0063] Illustratively, the power shaft and the groove portion 211 are spline-connected.

[0064] like Figure 1 As shown, in some embodiments, the plurality of intermediate shaft gears 300 include:

[0065] The intermediate shaft reverse gear 310 is mounted on a short shaft 210 located at one end of the intermediate shaft 200 .

[0066] As a known technology, the plurality of intermediate shaft gears 300 are divided into various types of intermediate shaft gears 300, such as the intermediate shaft 200 seventh gear, the intermediate shaft 200 sixth gear, the intermediate shaft 200 eighth gear, the intermediate shaft 200 fifth gear, the intermediate shaft 200 fourth gear, the intermediate shaft 200 third gear, the intermediate shaft 200 second gear, the intermediate shaft 200 first gear and the intermediate shaft reverse gear 310. Among them, by switching the connection between different intermediate shaft gears 300 and the intermediate shaft 200, different gears of the gearbox can be switched. Obviously, the intermediate shaft reverse gear 310 is a gear that is frequently switched, and the intermediate shaft reverse gear 310 is the most heavily loaded, that is, the intermediate shaft reverse gear 310 is a vulnerable part, especially in a harsh driving environment. In this embodiment, the intermediate shaft reverse gear 310 is installed on the short shaft 210 at one end of the intermediate shaft 200, so as to facilitate the subsequent disassembly and replacement of the intermediate shaft reverse gear 310 and facilitate after-sales maintenance.

[0067] like Figure 1 As shown, an embodiment of the present application further provides a gearbox, which includes an intermediate shaft assembly as in any of the above embodiments.

[0068] Since the above-mentioned gearbox has the above-mentioned technical effects, the transmission system including the gearbox should have the same technical effects, which will not be repeated here.

[0069] The gearbox in this embodiment takes an eight-speed dual-intermediate shaft gearbox as an example, which includes a pair of intermediate shaft assemblies, a power input shaft assembly and a power output shaft assembly 400. The power input shaft assembly is connected to the power output shaft through a pair of intermediate shaft assemblies, and then the power is transmitted to the power output shaft respectively through the pair of intermediate shaft assemblies. The details will not be repeated here, as they are common knowledge for technicians in this field.

[0070] Obviously, the gearbox is provided with two intermediate shaft assemblies, and the torque of the gearbox is shared by the two intermediate shaft assemblies, which can effectively reduce the stress on the intermediate shaft gear 300 and the support bearing 100; in addition, the support bearing 100 of the power output shaft assembly 400 of the gearbox theoretically only transmits torque without the effect of radial force, and the stress condition is effectively improved.

[0071] It should be noted that the common eight-speed dual-intermediate shaft gearboxes on the market are basically 2*4 front auxiliary gearbox solutions and 4*2 rear auxiliary gearbox solutions. However, for the field of off-road wide-body dump trucks and off-road mining dump trucks, the above structure has a lower efficiency due to the addition of multiple transmission stages.

[0072] In addition, based on the evaluation of engine capabilities and the research on related vehicles, the eight-speed dual intermediate shaft gearbox provided in this application is specifically applied for the speed ratios in Table 1, and the effect is particularly obvious:

[0073] Table 1

[0074] 1ST 2ND 3RD 4TH 5TH 6TH 7TH 8TH Reverse 6.730769 4.605263 3.396739 2.520161 1.858108 1.349432 1 0.752315 6.25 8.153846 6.012605 4.114907 3.052995 2.123693 1.449848 1 0.825974 7.571429 8.153846 6.012605 4.444099 3.263547 2.379592 1.63474 1 0.825974 7.571429 8.020833 5.661765 4.0625 2.928241 2.100694 1.451389 1 0.823063 7.447917 8.463636 6.407692 4.642105 3.332 2.370968 1.553659 1 0.712727 8.018182

[0075] The above table shows the speed ratios of 1st gear (1ST), 2nd gear (2ND), 3rd gear (3RD), 4th gear (4TH), 5th gear (5TH), 6th gear (6TH), 7th gear (7TH), 8th gear (8TH), and reverse gear. That is to say, a gearbox with the speed ratios of the above gears is suitable for the intermediate shaft assembly provided in this application.

[0076] like Figure 1 As shown, in some embodiments, the gearbox also includes a power output shaft assembly 400, the power output shaft assembly 400 has a power output shaft and a retarder gear 430, the retarder gear 430 is installed on the power output shaft, and the retarder gear 430 and the intermediate shaft reverse gear 310 are located at the same end of the power output shaft.

[0077] During gear alignment, the retarder gear 430 and the intermediate shaft reverse gear 310 are not assembled on the power output shaft and the intermediate shaft 200 first, but are assembled in sequence after the gear alignment; that is, the retarder gear 430 and the intermediate shaft reverse gear 310 are installed separately after the intermediate shaft 200 and the power output shaft are aligned, thereby reducing the difficulty of gear alignment assembly.

[0078] like Figure 4 As shown, in some embodiments, the power output shaft assembly 400 includes a shift sleeve 410 and a power output shaft gear 420 , the shift sleeve 410 has an external spline 411 ; the power output shaft gear 420 has an internal spline that can mesh with the external spline 411 .

[0079] That is to say, the shift sleeve 410 is used in conjunction with the shift fork, and the shift sleeve 410 is moved along the axial direction of the power output shaft by the shift fork, so that the external spline 411 of the shift sleeve 410 is engaged with the internal spline of the power output shaft gear 420 at the target position to complete the gear shifting.

[0080] Obviously, the shift sleeve 410 can replace the synchronizer of a traditional gearbox, and compared with the traditional synchronizer structure, the shift sleeve 410 in this embodiment can reduce the number of parts of the gearbox and reduce the cost.

[0081] like Figure 4 As shown, in some embodiments, chamfers 412 are provided on outer edges of opposite ends of the shift sleeve 410 .

[0082] For example, the external spline 411 is provided with chamfers 412 at both ends of the shift sleeve 410, and the chamfers 412 can play a guiding role in the shifting process, which is conducive to improving the success rate and reliability of the shifting. Optionally, the module of the external spline 411 of the shift sleeve 410 is set to be larger, which is conducive to improving the success rate and reliability of the shifting.

[0083] For example, the chamfer 412 can be a right-angle chamfer 412, so that both ends of the external spline 411 of the shift sleeve 410 form a large-sized inclined surface, thereby playing a guiding role. Of course, in other embodiments, it can also be set to a circular arc chamfer 412, etc.

[0084] An embodiment of the present application also provides a transmission system, which includes a gearbox as described in any of the above embodiments.

[0085] Since the above-mentioned gearbox has the above-mentioned technical effects, the transmission system including the gearbox should have the same technical effects, which will not be repeated here.

[0086] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0087] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0088] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An intermediate shaft assembly, characterized in that: The intermediate shaft assembly comprises: An intermediate shaft, the intermediate shaft comprising N levels of short shafts, the N levels of short shafts being coaxially connected in sequence; wherein N is a positive integer, and N≥2; Support bearings, the two ends of the short shaft of the first stage are respectively installed with the support bearings, and the end of the short shaft of the N+1 stage away from the short shaft of the N stage is installed with the support bearing; A plurality of intermediate shaft gears, wherein the plurality of intermediate shaft gears are distributed on the N-stage short shafts; One end surface of one of the adjacent short shafts has a groove, and the other end surface of one end of the short shaft has an inserting portion, and the inserting portion can be inserted into the groove; The groove portion and the plug-in portion are key-connected, and the key connection is a spline connection.

2. The intermediate shaft assembly according to claim 1, characterized in that: The structure of the groove portion located at the end of the intermediate shaft defines a power take-off interface.

3. The intermediate shaft assembly according to claim 1 or 2, characterized in that: The plurality of intermediate shaft gears include: An intermediate shaft reverse gear is mounted on the stub shaft at the end of the intermediate shaft.

4. A gearbox, characterized in that: The gearbox comprises an intermediate shaft assembly according to any one of claims 1 to 3.

5. The gearbox according to claim 4, characterized in that: The gearbox also includes: A power output shaft assembly comprises a power output shaft and a retarder gear, wherein the retarder gear is mounted on the power output shaft, and the retarder gear and the intermediate shaft reverse gear are located at the same end of the power output shaft.

6. The gearbox according to claim 5, characterized in that: The power output shaft assembly comprises: A shift sleeve, wherein the shift sleeve has external splines; The power output shaft stop gear has an internal spline, and the internal spline can mesh with the external spline.

7. The gearbox according to claim 6, characterized in that: The outer edges of the two opposite ends of the shift sleeve are both provided with chamfers.

8. A transmission system, characterized in that: The transmission system comprises a gearbox as claimed in any one of claims 4 to 7.

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