Tractor chassis structure

Abstract

The utility model provides a tractor chassis structure which comprises a gearbox shell, a rear axle shell, an HST assembly and two oppositely-arranged side plates, one end of each side plate is connected with the gearbox shell, and the other end of each side plate is connected with the rear axle shell. The HST assembly is located between the two side plates and fixed to the rear axle shell, an input shaft of the HST assembly extends into the gearbox shell, and an output shaft of the HST assembly extends into the rear axle shell. According to the utility model, the accommodating space is defined by the gearbox shell, the rear axle shell and the two side plates, and the HST assembly is arranged in the accommodating space and is fixed on the rear axle shell, so that the space between the gearbox shell and the rear axle shell is fully utilized, the arrangement of the HST assembly is realized, a chassis does not need to be enlarged, and the structure of the whole machine is compact.

Description

Technical Field

[0001] The utility model relates to the technical field of tractor chassis, and particularly relates to a tractor chassis structure. Background Art

[0002] At present, small tractors have become essential garden operation tools in many areas. To improve the operation convenience of tractors, more and more tractors adopt the transmission system of the HST assembly. In traditional tractor models, one end of the chassis is a gearbox housing, and the other end is a rear axle housing. The gearbox housing and the rear axle housing are connected by a transmission shaft, and the main transmission assembly is generally placed inside the gearbox housing. In the models adopting the HST assembly, the HST assembly replaces the function of the main transmission, but the HST assembly occupies a large space and can neither be placed inside the gearbox housing nor inside the rear axle housing, so only the size of the tractor chassis can be increased, thus increasing the overall volume of the whole machine, which is not conducive to the miniaturization development of tractors. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is: how to install the HST assembly without increasing the chassis size.

[0004] The technical solution for the utility model to solve the above technical problem is as follows:

[0005] The utility model provides a tractor chassis structure, which includes a gearbox housing, a rear axle housing, an HST assembly, and two oppositely arranged side plates. One end of the side plate is connected to the gearbox housing, and the other end of the side plate is connected to the rear axle housing; the HST assembly is located between the two side plates, the HST assembly is fixed on the rear axle housing, the input shaft of the HST assembly extends into the gearbox housing, and the output shaft of the HST assembly extends into the rear axle housing.

[0006] The beneficial effect of the utility model is:

[0007] By adopting the utility model, an accommodation space is formed by the gearbox housing, the rear axle housing and the two side plates, the HST assembly is installed in the accommodation space and fixed on the rear axle housing, making full use of the space between the gearbox housing and the rear axle housing to realize the layout of the HST assembly, and there is no need to increase the chassis size, so the overall structure of the whole machine is compact; the input shaft of the HST assembly extends into the gearbox housing, so as to be able to connect the transmission box inside the gearbox housing to realize power input; the output shaft of the HST assembly extends into the rear axle housing, so as to be able to connect the walking transmission part inside the rear axle housing to realize power output.

[0008] Based on the above technical solution, the utility model can be further improved as follows.

[0009] Further, strip-shaped protrusions are distributed on the outer side of the side plate.

[0010] Preferably, the strip-shaped protrusions intersect with each other and form a grid shape.

[0011] This facilitates increasing the strength and stiffness of the side plate, avoiding deformation, and reducing the weight of the whole machine at the same time.

[0012] Furthermore, the side plate coincides with the side part of the transmission housing and is connected by bolts; the side plate coincides with the side part of the rear axle housing and is connected by bolts.

[0013] Through the partially overlapping structure, the contact area between the transmission housing and the rear axle housing and the side plate is increased respectively, the stress generated at the connection position is reduced, and the chassis strength is improved; through bolt connection, it is convenient to disassemble and assemble and easy to maintain.

[0014] Furthermore, an input spline sleeve is provided on the input shaft of the HST assembly, and the input spline sleeve extends into the transmission housing.

[0015] The input spline sleeve can be used to connect the output shaft of the transmission, with convenient connection and reliable transmission.

[0016] Furthermore, the output shaft of the HST assembly includes a first output shaft and a second output shaft; a rear central transmission mechanism and a rear-mounted PTO assembly are also provided in the rear axle housing. The first output shaft is connected to the rear central transmission mechanism, the second output shaft is connected to the rear-mounted PTO assembly, and the output shaft of the rear-mounted PTO assembly extends out of the rear axle housing.

[0017] Both the rear central transmission mechanism and the rear-mounted PTO assembly are arranged in the rear axle housing, avoiding the rear-mounted PTO assembly from occupying extra space, facilitating reducing the volume of the chassis, and the whole machine has good compactness.

[0018] Furthermore, a range gearbox is also provided in the rear axle housing. The first output shaft is connected to the input shaft of the range gearbox, and the output shaft of the range gearbox is connected to the rear central transmission mechanism.

[0019] This facilitates controlling the rotational speed of the first output shaft transmitted to the rear central transmission mechanism, thereby controlling the traveling speed of the tractor; by accommodating the range gearbox in the rear axle housing, the structure is compact and occupies little space.

[0020] Furthermore, the rear central transmission mechanism includes a gear disc. One end face of the gear disc meshes with the output shaft of the range gearbox; coaxial central transmission shafts are provided at both ends of the gear disc. The central transmission shafts extend out of the rear axle housing and are connected to a traveling transmission case, and the traveling transmission case is fixed to the rear axle housing; a brake is provided at one end of the output shaft of the traveling transmission case, and a tire is provided at the other end.

[0021] This facilitates transmitting the power of the range gearbox to the traveling transmission case, and the traveling transmission case transmits the power to the tire for the tractor to travel, with reliable transmission.

[0022] Further, a through hole is also provided on one side of the rear axle housing away from the transmission housing, and the output shaft of the rear-mounted PTO assembly extends out of the rear axle housing through the through hole.

[0023] This avoids the exposure of the transmission structure of the rear-mounted PTO assembly, protects it from corrosion by external contaminants, and improves safety.

[0024] Further, an output spline sleeve is also provided on the second output shaft, and the output spline sleeve is connected to the rear-mounted PTO assembly.

[0025] The power on the second output shaft is transmitted to the rear-mounted PTO assembly through the spline sleeve, with reliable transmission, small occupied space, and avoidance of structural interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 are schematic structural diagrams of the present invention.

[0027] Figure 2 are schematic diagrams of the installation state of the present invention.

[0028] In the drawings, the technical features represented by the reference numerals are as follows:

[0029] 1 - transmission housing; 2 - rear axle housing; 3 - HST assembly; 4 - side plate; 5 - strip-shaped protrusion; 6 - input spline sleeve; 7 - rear central transmission mechanism; 8 - rear-mounted PTO assembly; 9 - traveling transmission case; 10 - brake; 11 - auxiliary transmission; 12 - through hole; 13 - output spline sleeve; 14 - tooth disc. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0031] The present invention is described with reference to Figure 1-2 .

[0032] The present invention provides a tractor chassis structure, including a transmission housing 1, a rear axle housing 2, an HST assembly 3, and two relatively arranged side plates 4. One end of the side plate 4 is connected to the transmission housing 1, and the other end of the side plate 4 is connected to the rear axle housing 2; the HST assembly 3 is located between the two side plates 4, the HST assembly 3 is fixed to the rear axle housing 2, the input shaft of the HST assembly 3 extends into the transmission housing 1, and the output shaft of the HST assembly 3 extends into the rear axle housing 2.

[0033] Principle:

[0034] The transmission housing 1 is used to accommodate the main transmission assembly. After the HST assembly 3 replaces the function of the main transmission, the transmission housing 1 can be used to accommodate the transfer case. The rear axle housing 2 is used to accommodate the walking transmission parts such as the rear center drive mechanism 7. During installation, the rear center drive mechanism 7 is connected to the output shaft of the HST assembly 3, and the power of the HST assembly 3 can be transmitted to the walking transmission cases 9 on both left and right sides. The walking transmission cases 9 can transmit the power to the tires. The transmission housing 1, the rear axle housing 2, the HST assembly 3, the rear center drive mechanism 7, the walking transmission cases 9, etc. are all prior arts, and the transmission parts are irrelevant to the technical problems solved by the present utility model, so they will not be elaborated herein.

[0035] By adopting the present utility model, an accommodation space is enclosed by the transmission housing 1, the rear axle housing 2 and two side plates 4. The HST assembly 3 is installed into the accommodation space and fixed on the rear axle housing 2, making full use of the space between the transmission housing 1 and the rear axle housing 2, realizing the layout of the HST assembly 3, and without the need to increase the chassis, the overall structure is compact. The input shaft of the HST assembly 3 extends into the transmission housing 1, so as to be able to connect the transfer case in the transmission housing 1 to achieve power input. The output shaft of the HST assembly 3 extends into the rear axle housing 2, so as to be able to connect the walking transmission parts in the rear axle housing 2 to achieve power output.

[0036] Further, strip-shaped protrusions 5 are distributed on the outer side of the side plate 4.

[0037] Preferably, the strip-shaped protrusions 5 are staggered with each other and form a grid shape.

[0038] It is convenient to increase the strength and rigidity of the side plate 4, avoid deformation, and at the same time reduce the overall weight of the machine.

[0039] Further, the side plate 4 overlaps with the side part of the transmission housing 1 and is connected by bolts; the side plate 4 overlaps with the side part of the rear axle housing 2 and is connected by bolts.

[0040] Through the partial overlapping structure, the contact area between the transmission housing 1 and the rear axle housing 2 and the side plate 4 is increased respectively, the stress generated at the connection position is reduced, and the chassis strength is improved; through the bolt connection, the disassembly and assembly are convenient and the maintenance is easy.

[0041] Further, an input spline sleeve 6 is provided on the input shaft of the HST assembly 3, and the input spline sleeve 6 extends into the transmission housing 1.

[0042] The input spline sleeve 6 can be used to connect the output shaft of the transmission, the connection is convenient and the transmission is reliable.

[0043] Further, the output shaft of the HST assembly 3 includes a first output shaft and a second output shaft; a rear center drive mechanism 7 and a rear PTO assembly 8 are also provided in the rear axle housing 2. The first output shaft is connected to the rear center drive mechanism 7, the second output shaft is connected to the rear PTO assembly 8, and the output shaft of the rear PTO assembly 8 extends out of the rear axle housing 2.

[0044] Note: The rear center drive mechanism 7 and the rear PTO assembly 8 are both prior arts. The rear center drive mechanism 7 is used to transmit power to the two side tires, and the rear PTO assembly 8 is used to output power for external implements. Generally, the structure of the rear center drive mechanism 7 can be: including a gear disc 14, the first output shaft meshes with the gear disc 14, and central drive shafts are provided at both ends of the gear disc 14. The central drive shafts extend out of the rear axle housing 2 and are connected to a travel transmission case 9. A brake 10 and tires are provided on the output shaft of the travel transmission case 9. In addition, it is also a prior art that the HST assembly 3 has two output shafts; generally, the adoptable structure is: the two output shafts are distributed one above the other, the second output shaft and the input shaft of the HST assembly 3 are the same shaft, and the first output shaft and the second output shaft are connected by a gear set transmission; the gear set can also be a continuously variable transmission gear set. The technical problem solved by the present utility model is to provide an installation space for the rear center drive mechanism 7 and the rear PTO assembly 8 through the rear axle housing 2 to reduce the volume of the tractor chassis, which has nothing to do with the transmission process.

[0045] Both the rear center drive mechanism 7 and the rear PTO assembly 8 are arranged in the rear axle housing 2, which avoids the rear PTO assembly 8 occupying extra space, facilitates reducing the chassis volume, and the whole machine has good compactness.

[0046] Further, a sub-transmission 11 is also provided in the rear axle housing 2. The first output shaft is connected to the input shaft of the sub-transmission 11, and the output shaft of the sub-transmission 11 is connected to the rear center drive mechanism 7.

[0047] It is convenient to control the rotational speed transmitted from the first output shaft to the rear center drive mechanism 7, thereby controlling the travel speed of the tractor; the sub-transmission 11 is accommodated by the rear axle housing 2, with a compact structure and small occupied space.

[0048] Further, the rear center drive mechanism 7 includes a gear disc 14. One end face of the gear disc 14 meshes with the output shaft of the sub-transmission 11; coaxial central drive shafts are provided at both ends of the gear disc 14. The central drive shafts extend out of the rear axle housing 2 and are connected to a travel transmission case 9. The travel transmission case 9 is fixed to the rear axle housing 2; one end of the output shaft of the travel transmission case 9 is provided with a brake 10, and the other end is provided with tires.

[0049] Note: The output shaft of the sub-transmission 11 is of a bevel gear structure.

[0050] It is convenient to transmit the power of the auxiliary transmission 11 to the traveling transmission case 9, and the traveling transmission case 9 transmits the power to the tires for the tractor to travel, with reliable transmission.

[0051] Furthermore, a through hole 12 is also provided on one side of the rear axle housing 2 away from the transmission housing 1, and the output shaft of the rear-mounted PTO assembly 8 extends out of the rear axle housing 2 through the through hole 12.

[0052] It avoids the exposure of the transmission structure of the rear-mounted PTO assembly 8, protects it from corrosion by external pollutants, and improves safety.

[0053] Furthermore, an output spline sleeve 13 is also provided on the second output shaft, and the output spline sleeve 13 is connected to the rear-mounted PTO assembly 8.

[0054] The power on the second output shaft is transmitted to the rear-mounted PTO assembly 8 through the spline sleeve, with reliable transmission, small occupied space, and avoiding structural interference.

[0055] In the description of the present utility model, it should be understood that if descriptive terms indicating orientation, direction or positional relationship appear, such as: "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of understanding the present utility model and simplifying the description, rather than indicating or implying that the part, component or whole referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0056] In addition, if descriptive terms indicating order appear, such as: "first", "second", etc., their use in this specification is for the convenience of understanding or simplifying the description. For example, in order to distinguish multiple technical features of the same type or function and having to be mentioned separately, this specification may use the method of prefixing or suffixing descriptive terms of order to distinguish them. Therefore, it cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0057] In the present utility model, if descriptive terms regarding the relative structural action relationship are adopted, such as "installed", "connected", "joined", "fixed", etc., unless otherwise clearly specified and defined, they should be understood in a broad sense. For example, "installed", "connected", "joined", etc. can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components; "fixed" can be a fixed integration or a detachable fixation through fasteners; it can be a direct fixation or a fixation through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above descriptive terms in the present utility model can be understood according to the specific circumstances, the context, the coherence of the context before and after, etc.

[0058] In the present utility model, if descriptive terms with an attached or connection meaning appear, for example, the first feature is "on" or "under" the second feature, unless otherwise clearly specified and defined, it should not be understood in a restrictive sense. For example, "on" or "under" can be that the first and second features are in direct contact or the first feature and the second feature are in indirect contact through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above descriptive terms in the present utility model can be understood according to the specific circumstances, the context, the coherence of the context before and after, etc.

[0059] Furthermore, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0060] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expression of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments, examples, and the features of different embodiments and examples described in this specification, and these combinations or combinations should all fall within the scope summarized by the present utility model.

[0061] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the information available through their public channels, in combination with the technical revelations provided in this application document.

Claims

1. A tractor chassis structure, characterized in that: It includes a transmission housing (1), a rear axle housing (2), an HST assembly (3), and two oppositely arranged side plates (4). One end of the side plate (4) is connected to the transmission housing (1), and the other end of the side plate (4) is connected to the rear axle housing (2); the HST assembly (3) is located between the two side plates (4), the HST assembly (3) is fixed to the rear axle housing (2), the input shaft of the HST assembly (3) extends into the transmission housing (1), and the output shaft of the HST assembly (3) extends into the rear axle housing (2).

2. The tractor chassis structure according to claim 1, characterized in that: Strip-shaped protrusions (5) are distributed on the outer side of the side plate (4).

3. The tractor chassis structure according to claim 2, characterized in that: The strip-shaped protrusions (5) intersect with each other and form a grid shape.

4. The tractor chassis structure according to claim 1, wherein: The side plate (4) coincides with a side part of the transmission housing (1) and is connected by bolts; the side plate (4) coincides with a side part of the rear axle housing (2) and is connected by bolts.

5. The tractor chassis structure according to claim 1, characterized in that: An input spline sleeve (6) is provided on the input shaft of the HST assembly (3), and the input spline sleeve (6) extends into the transmission housing (1).

6. The tractor chassis structure according to claim 1, characterized in that: The output shaft of the HST assembly (3) includes a first output shaft and a second output shaft; a rear central transmission mechanism (7) and a rear PTO assembly (8) are further provided in the rear axle housing (2), the first output shaft is coupled to the rear central transmission mechanism (7), the second output shaft is coupled to the rear PTO assembly (8), and the output shaft of the rear PTO assembly (8) extends out of the rear axle housing (2).

7. The tractor chassis structure according to claim 6, characterized in that: A sub-transmission (11) is further provided in the rear axle housing (2), the first output shaft is coupled to the input shaft of the sub-transmission (11), and the output shaft of the sub-transmission (11) is coupled to the rear central transmission mechanism (7).

8. The tractor chassis structure according to claim 7, characterized in that: The rear central transmission mechanism (7) includes a gear disc (14), one end face of the gear disc (14) meshes with the output shaft of the sub-transmission (11); coaxial central transmission shafts are provided at both ends of the gear disc (14), the central transmission shafts extend out of the rear axle housing (2) and are coupled to a traveling transmission case (9), and the traveling transmission case (9) is fixed to the rear axle housing (2); a brake (10) is provided at one end of the output shaft of the traveling transmission case (9), and a tire is provided at the other end.

9. The tractor chassis structure according to claim 6, wherein: A through hole (12) is further provided on one side of the rear axle housing (2) away from the transmission housing (1), and the output shaft of the rear PTO assembly (8) extends out of the rear axle housing (2) through the through hole (12).

10. The tractor chassis structure according to claim 6, characterized in that: An output spline sleeve (13) is further provided on the second output shaft, and the output spline sleeve (13) is coupled to the rear PTO assembly (8).

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