HST type transmission case and HST assembly transmission structure

Abstract

The utility model provides an HST type transmission case and an HST assembly transmission structure, the HST type transmission case comprises a transmission case shell, a transmission shaft and an oil recharging pump, the middle part of the transmission shaft is connected with the interior of the transmission case shell through at least two bearings, and the oil recharging pump is fixed on the transmission case shell; an oil supplementing output shaft is further arranged in the transmission case shell and is in transmission connection with the transmission shaft through a gear, and one end of the oil supplementing output shaft is connected with the input end of the oil supplementing pump. According to the utility model, the transmission case shell provides a mounting space for the oil supplementing pump of the HST assembly, so that the space utilization rate of the transmission case part of the whole machine is improved; meanwhile, the power of the transmission shaft is transmitted to the oil recharging pump through the oil recharging output shaft, a power transmission-in structure independently arranged in the oil recharging pump in the HST assembly is omitted, the space of the oil recharging pump and the power transmission-in structure in the HST assembly is saved, and the compactness of the whole machine is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to agricultural machinery HST assembly technical field, concretely relates to a kind of HST machine type transmission case and HST assembly transmission structure. BACKGROUND

[0002] At present, tractor and various agricultural machinery increasingly adopt hydraulic stepless speed change assembly (i.e. HST assembly). HST assembly is internally provided with speed change function, replaces the speed change function of original main gearbox, so that the gear speed change in main gearbox is no longer needed, and the gearbox becomes single-function transmission case. However, transmission case is still needed to transmit power between engine and HST assembly, and transmission case provides protection and lubrication space for internal shaft and bearing, while also occupies large space, so that the space utilization of whole machine is low, and the structure is not compact. SUMMARY

[0003] The utility model solves the technical problem of how to improve the space utilization of transmission case part of whole machine.

[0004] The utility model solves the technical problem of the above technical scheme as follows:

[0005] The utility model provides a kind of HST machine type transmission case, including transmission case shell, transmission shaft, oil supplement pump, the middle part of transmission shaft is connected with the inside of transmission case shell by at least two bearings, and the oil supplement pump is fixed on transmission case shell;Oil supplement output shaft is also provided in transmission case shell, and oil supplement output shaft is connected with transmission shaft by gear transmission, and one end of oil supplement output shaft is connected with the input end of oil supplement pump.

[0006] The utility model has the advantages of:

[0007] By the transmission case shell of the utility model, installation space is provided for the oil supplement pump of HST assembly, the space utilization of transmission case part of whole machine is improved;Meanwhile, by additionally arranging oil supplement output shaft in transmission case shell, the power of transmission shaft is transmitted to oil supplement pump, realizes the power supply of oil supplement pump, saves the power transmission structure of oil supplement pump arranged separately in HST assembly, saves the space of oil supplement pump and its power transmission structure in HST assembly, improves the compactness of whole machine. The middle part of transmission shaft is connected with the inside of transmission case shell by at least two bearings, provides protection and lubrication space for transmission shaft and bearing, and guarantees the stability of transmission shaft.

[0008] On the basis of the above technical scheme, the utility model can also be improved as follows.

[0009] Further, the middle part of transmission shaft is provided with output gear, and the middle part of oil supplement output shaft is provided with input gear, and the input gear is engaged with the output gear.

[0010] The transmission shaft and the oil supplement output shaft are in transmission, the assembly is convenient, and the transmission is reliable.

[0011] Further, the two ends of the oil supplement output shaft are connected with the transmission box shell through bearings; the bearings on the transmission shaft are located on the two sides of the output gear.

[0012] The vibration of the output gear and the input gear due to the shaft deflection is avoided, and the reliability and efficiency of the transmission of the output gear and the input gear are improved.

[0013] Further, the transmission box shell is provided with a transmission cavity, the output gear is located at the upper part of the transmission cavity, the bearings on the transmission shaft are located at the two ends of the transmission cavity, and the input gear is located at the lower part of the transmission cavity.

[0014] The lower part of the transmission cavity can accommodate lubricating oil, facilitating the lubrication of the gears and bearings, and avoiding the leakage of lubricating oil.

[0015] Further, the side of the transmission box shell away from the oil supplement pump is also provided with a bell mouth structure, and the edge of the bell mouth structure is provided with a flange plate.

[0016] The installation surface is expanded through the bell mouth structure, the flange plate can be fixed on the chassis bottom plate through bolts, has strong bearing capacity and good installation stability; meanwhile, the bell mouth structure can be used to accommodate torsional dampers and the like, and the structure is compact.

[0017] Further, the bell mouth structure is also provided with a torsional damper, and the torsional damper is connected with the transmission shaft.

[0018] The vibration and deflection of the input end of the transmission shaft are conveniently reduced, and the transmission stability is improved.

[0019] Further, the lower side of the bell mouth structure is also provided with a lower cover, the lower cover is connected with the lower side wall of the bell mouth structure through bolts, and the outer side of the lower side wall of the bell mouth structure is a plane.

[0020] After the lower cover is disassembled, the torsional damper and the like inside the bell mouth structure can be conveniently observed, and the maintenance is convenient.

[0021] Further, the side wall of the bell mouth structure is also provided with a pressure relief valve.

[0022] When the pressure in the transmission box shell is too large, the gas pressure can rush to open the pressure relief valve to reduce the pressure; when the pressure in the transmission box shell returns to the safe range, the pressure relief valve is closed to prevent the backflow of external air; and the safety is improved.

[0023] Further, the end of the oil supplement output shaft opposite to the oil supplement pump is in a cylindrical structure, the cylindrical structure is provided with an internal spline, the input shaft of the oil supplement pump is provided with an external spline, the input shaft of the oil supplement pump extends into the cylindrical structure and is engaged with the internal spline of the cylindrical structure.

[0024] The installation is convenient, the use of a coupling and other connecting members is saved, meanwhile, the input shaft of the oil supplement pump extends into the cylindrical structure, so that a gap is not required between the casing of the oil supplement pump and the casing of the transmission case, the sealing difficulty is small, and the structure is compact.

[0025] The utility model also provides a kind of HST assembly transmission structure, including HST assembly and above-mentioned HST machine type transmission case, and the input end of HST assembly is connected with the one end of transmission shaft.

[0026] The oil supplement pump on the HST machine type transmission case is the oil supplement pump of HST assembly, power supply of oil supplement pump is realized using HST machine type transmission case, power transmission structure is saved in HST assembly for being separately arranged in oil supplement pump, the space of oil supplement pump and its power transmission structure in HST assembly is saved, and the compactness of whole machine is improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the structure diagram of the utility model HST machine type transmission case.

[0028] Figure 2 It is the sectional view of the utility model HST machine type transmission case along transmission shaft.

[0029] Figure 3 It is the sectional view of the utility model HST machine type transmission case along lower cover.

[0030] Figure 4 It is the structure diagram of the utility model HST assembly transmission structure.

[0031] In the drawings, the technical features represented by each reference sign are as follows:

[0032] 1-transmission case casing;2-transmission shaft;3-oil supplement output shaft;4-oil supplement pump;5-output gear;6-input gear;7-transmission cavity;8-horn mouth structure;9-torsional damper;10-lower cover;11-pressure reducing valve;12-HST assembly. DETAILED DESCRIPTION

[0033] The principles and features of the utility model are described below in combination with the drawings, and the examples are only used to explain the utility model, and not used to limit the scope of the utility model.

[0034] The utility model refers to Figures 1-4 .

[0035] The utility model provides a kind of HST machine type transmission case, including transmission case shell 1, transmission shaft 2, oil supplement pump 4, the middle part of transmission shaft 2 is connected with the inside of transmission case shell 1 by at least two bearings, and the oil supplement pump 4 is fixed on transmission case shell 1;Transmission case shell 1 is also provided with oil supplement output shaft 3, and oil supplement output shaft 3 is connected with transmission shaft 2 by gear transmission, and one end of oil supplement output shaft 3 is connected with the input end of oil supplement pump 4.

[0036] Principle:

[0037] When installing, transmission case shell 1 is fixed on the chassis of agricultural machinery, one end of transmission shaft 2 is connected with engine, and the other end is connected with HST assembly 12.HST assembly 12 is prior art on tractor and other agricultural machinery, which includes hydraulic pump, hydraulic motor and oil supplement pump 4, transmission shaft 2 is connected with hydraulic pump, and the output flow of hydraulic pump is controllable under the condition that input speed is constant (for example, inclined plate variable pump can be used, and variable control is its self-contained function), and hydraulic pump is connected with hydraulic motor in loop, and the output flow of hydraulic pump determines the rotating speed of hydraulic motor, so that stepless speed change is realized; oil supplement pump 4 is connected with both sides of hydraulic pump loop through one-way valve, and oil supplement pump 4 is driven by oil supplement output shaft 3 to supplement oil to the low pressure side of loop.Oil supplement output shaft 3 and the input shaft of oil supplement pump 4 can use the same shaft, or can use split structure and be connected by shaft coupling and other components.

[0038] By the utility model, transmission case shell 1 provides installation space for oil supplement pump 4 of HST assembly 12, so that the space utilization of transmission case part of whole machine is improved; at the same time, by adding oil supplement output shaft 3 in transmission case shell 1, the power of transmission shaft 2 is transmitted to oil supplement pump 4, so that the power supply of oil supplement pump 4 is realized, the power transmission structure of oil supplement pump 4 in HST assembly 12 is saved, the space of oil supplement pump 4 and its power transmission structure in HST assembly 12 is saved, and the compactness of whole machine is improved.

[0039] Further, the middle part of transmission shaft 2 is provided with output gear 5, and the middle part of oil supplement output shaft 3 is provided with input gear 6, and input gear 6 is engaged with output gear 5.

[0040] The transmission of transmission shaft 2 and oil supplement output shaft 3 is realized, and the transmission is convenient and reliable.

[0041] Further, the both ends of oil supplement output shaft 3 are connected with transmission case shell 1 through bearings; the bearings on transmission shaft 2 are located on both sides of output gear 5.

[0042] Avoid the output gear 5 and input gear 6 due to shaft deflection and vibration, improve the reliability and efficiency of the output gear 5 and input gear 6 transmission.

[0043] Further, the transmission box shell 1 is provided with transmission cavity 7, the output gear 5 is located in the upper part of transmission cavity 7, the bearing on the transmission shaft 2 is located at both ends of transmission cavity 7, the input gear 6 is located in the lower part of transmission cavity 7.

[0044] The lower part of transmission cavity 7 can accommodate lubricating oil, which is convenient for lubrication of gears and bearings, and can avoid leakage of lubricating oil.

[0045] Further, the transmission box shell 1 away from the oil pump 4 side is also provided with the horn structure 8, the edge of the horn structure 8 is provided with flange plate.

[0046] The horn structure 8 expands the installation surface, the flange plate can be fixed on the chassis by bolts, which has strong bearing capacity and good installation stability; at the same time, the horn structure 8 can be used to accommodate torsional vibration absorber 9 and other components, which has compact structure.

[0047] Further, the horn structure 8 is also provided with torsional vibration absorber 9, which is connected with the transmission shaft 2.

[0048] Note: torsional vibration absorber 9 is prior art.

[0049] It is convenient to reduce the vibration and deflection of the input end of the transmission shaft 2, and improve the transmission stability.

[0050] Further, the lower side of the horn structure 8 is also provided with the lower cover 10, the lower cover 10 is connected with the lower side wall of the horn structure 8 by bolts, and the outer side of the lower side wall of the horn structure 8 is a plane.

[0051] The lower cover 10 can be easily removed to check the torsional vibration absorber 9 and other structures inside the horn structure 8, which is convenient for maintenance.

[0052] Further, the side wall of the horn structure 8 is also provided with pressure relief valve 11.

[0053] When the pressure in the transmission box shell 1 is too large, the gas pressure can blow off the pressure relief valve 11 to reduce the pressure; when the pressure in the transmission box shell 1 returns to the safe range, the pressure relief valve 11 is closed to prevent the backflow of external air; improve the safety.

[0054] Further, the one end of the oil supplement output shaft 3 opposite to the oil pump 4 is a cylindrical structure, the inner spline is arranged in the cylindrical structure, the input shaft of the oil pump 4 is provided with the outer spline, the input shaft of the oil pump 4 extends into the cylindrical structure and engages with the inner spline of the cylindrical structure.

[0055] The installation is convenient, the use of a coupling and other connecting members is saved, meanwhile, the input shaft of the oil supplement pump 4 extends into the cylindrical structure, so that a gap is not required between the housing of the oil supplement pump 4 and the transmission case housing 1, the sealing difficulty is small, and the structure is compact.

[0056] The utility model further provides a kind of HST assembly transmission structure, including HST assembly 12 and above-mentioned HST machine type transmission case, and one end of transmission shaft 2 is connected with the input end of HST assembly 12.

[0057] The oil supplement pump 4 on the HST machine type transmission case is the oil supplement pump 4 of HST assembly 12, power supply of oil supplement pump 4 is realized using HST machine type transmission case, the power transmission structure of oil supplement pump 4 in HST assembly 12 is saved from being separately arranged, the space of oil supplement pump 4 and its power transmission structure in HST assembly 12 is saved, and the compactness of whole machine is improved.

[0058] In the description of the utility model, it is understood that if the description of direction, direction or positional relationship appears, for example: "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", the direction or position relationship indicated in the specification is based on the direction or position relationship shown in the drawing, and is only for the convenience of understanding the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated part, element or whole must have a particular orientation, structure and operation, so it cannot be understood as a limitation on the utility model.

[0059] In addition, if the order description language appears, for example: "first", "second" and the like, the use in the specification is for the convenience of understanding or simplifying the description, for example, when it is necessary to mention individually, the specification can distinguish it by using the order description language of prefix or suffix. Therefore, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the feature limited by "first", "second" can be explicitly or implicitly included at least one feature. In the description of the utility model, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0060] In the utility model, if the structure relative action relation description language is used, for example: "installation", "connection", "connection", "fixing" and the like, unless there is definite stipulation and limitation, otherwise should do the broad sense understanding. For example, "installation", "connection", "connection" and the like, can be fixed connection, also can be detachable connection, or integrated; can be mechanical connection, also can be electrical connection; can be directly connected, also can be indirectly connected through intermediate medium, can be the intercommunication of two elements or the interaction of two elements; "fixing" can be integrated fixing, also can be detachable fixing through fastener; can be direct fixing, also can be fixed through intermediate medium. For the ordinary skilled in the art, the specific meaning of the above description language in the utility model can be understood according to specific circumstances, context, the coherence of the preceding and following texts and the like.

[0061] In the utility model, if the description language containing accessory or connection meaning appears, for example, the first feature is "on" or "under" the second feature, unless there is definite stipulation and limitation, otherwise should not be limitedly understood, for example, "on" or "under" can be that the first and second features directly contact, also can be that the first feature and the second feature indirectly contact through intermediate medium. For the ordinary skilled in the art, the specific meaning of the above description language in the utility model can be understood according to specific circumstances, context, the coherence of the preceding and following texts and the like.

[0062] Further, the first feature is "on", "above" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature. The first feature is "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0063] In the description of the specification, the description of the reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments, examples and features of different embodiments, examples described in the specification without contradiction, which should be included in the range of the utility model.

[0064] Although the above has shown and described the embodiments of the present application, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and within the scope of information available to the public, the changes, modifications, replacements and variations of the above embodiments made by the ordinary skilled in the art in combination with the technical inspiration given by the present application document can still be covered within the protection scope of the present application.

Claims

1. A transmission box for an HST model, characterized in that: The system includes a transmission housing (1), a transmission shaft (2), and an oil replenishment pump (4). The middle part of the transmission shaft (2) is connected to the interior of the transmission housing (1) through at least two bearings. The oil replenishment pump (4) is fixed on the transmission housing (1). The transmission housing (1) is also provided with an oil replenishment output shaft (3). The oil replenishment output shaft (3) is connected to the transmission shaft (2) through gear transmission. One end of the oil replenishment output shaft (3) is connected to the input end of the oil replenishment pump (4).

2. The HST model transmission box according to claim 1, characterized in that: The transmission shaft (2) has an output gear (5) in the middle, and the oil replenishment output shaft (3) has an input gear (6) in the middle, and the input gear (6) meshes with the output gear (5).

3. The HST model transmission box according to claim 2, characterized in that: The two ends of the oil replenishment output shaft (3) are connected to the transmission housing (1) via bearings; the bearings on the transmission shaft (2) are located on both sides of the output gear (5).

4. The HST model transmission box according to claim 3, characterized in that: The transmission housing (1) is provided with a transmission cavity (7), the output gear (5) is located at the upper part of the transmission cavity (7), the bearings on the transmission shaft (2) are located at both ends of the transmission cavity (7), and the input gear (6) is located at the lower part of the transmission cavity (7).

5. The HST model transmission box according to claim 1, characterized in that: The transmission housing (1) is also provided with a flared structure (8) on the side away from the oil pump (4), and the edge of the flared structure (8) is provided with a flange.

6. The HST model transmission box according to claim 5, characterized in that: The flared structure (8) is also equipped with a torsional damper (9), which is connected to the drive shaft (2).

7. The HST model transmission box according to claim 6, characterized in that: The lower side of the flared structure (8) is also provided with a lower cover (10), which is connected to the lower side wall of the flared structure (8) by bolts. The outer side of the lower side wall of the flared structure (8) is a plane.

8. The HST model transmission box according to claim 5, characterized in that: A pressure reducing valve (11) is also provided on the side wall of the flared structure (8).

9. The HST model transmission box according to claim 1, characterized in that: The end of the oil replenishment output shaft (3) facing the oil replenishment pump (4) is a cylindrical structure with an internal spline inside. The input shaft of the oil replenishment pump (4) is provided with an external spline, and the input shaft of the oil replenishment pump (4) extends into the cylindrical structure and meshes with the internal spline of the cylindrical structure.

10. An HST assembly transmission structure, comprising an HST assembly (12), characterized in that: It also includes the HST model transmission box as described in any one of claims 1-9, wherein one end of the transmission shaft (2) is connected to the input end of the HST assembly (12).

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