阅读说明：本技术 变速箱 (Gear box ) 是由 陆立峰 金刚强 于 2020-07-10 设计创作，主要内容包括：本发明涉及一种变速箱,包括第一壳体、第二壳体、变矩器总成、PTO总成变速器总成、差速器总成、输入轴、惰轮轴、输出轴和齿轮组件,变矩器总成包括液力变矩器、泵轮毂、主动链轮,主动链轮与泵轮毂传动连接；PTO总成包括导轮座、PTO轴和链条,导轮座与第一壳体固定连接,主动链轮安装在导轮座上,且主动链轮与PTO轴通过链条传动配合,齿轮组件包括齿轴和螺伞从动齿轮,螺伞从动齿轮套设在齿轴上,螺伞从动齿轮与啮合齿部之间还套设有衬套,且螺伞从动齿轮另一侧与第一轴承相抵。本发明通过链条传动实现了PTO输出功能,简化了结构；且将螺伞从动齿轮固定在齿轴上,降低噪音,提高稳定性。(The invention relates to a gearbox, which comprises a first shell, a second shell, a torque converter assembly, a PTO assembly transmission assembly, a differential assembly, an input shaft, an idler shaft, an output shaft and a gear assembly, wherein the torque converter assembly comprises a hydraulic torque converter, a pump hub and a driving sprocket, and the driving sprocket is in transmission connection with the pump hub; the PTO assembly comprises a guide wheel seat, a PTO shaft and a chain, the guide wheel seat is fixedly connected with the first shell, a driving chain wheel is installed on the guide wheel seat, the driving chain wheel is in transmission fit with the PTO shaft through the chain, the gear assembly comprises a gear shaft and a spiral bevel driven gear, the spiral bevel driven gear is sleeved on the gear shaft, a bushing is further sleeved between the spiral bevel driven gear and the meshing tooth part, and the other side of the spiral bevel driven gear is abutted to the first bearing. The PTO output function is realized through chain transmission, and the structure is simplified; and fix spiral bevel driven gear on the pinion, the noise reduction improves stability.)

1. The gearbox comprises a first shell (61) and a second shell (62) which are fixed with each other, a transmission assembly arranged in the first shell (61), a differential assembly arranged in the second shell (62), an input shaft (14), an idler shaft (16), an output shaft (17) and a gear assembly, and is characterized in that the transmission assembly comprises a torque converter assembly and a PTO assembly, the torque converter assembly comprises a hydraulic torque converter (1), a pump hub (3), a driving sprocket (4) and a turbine shaft (2), the pump hub (3) is fixedly connected with a pump wheel on the hydraulic torque converter (1), and the driving sprocket (4) is in spline transmission connection with the pump hub (3); the PTO assembly comprises a guide wheel seat (5), a PTO shaft (9) and a chain (7), wherein two ends of the PTO shaft (9) are rotatably arranged in a first shell (61), the guide wheel seat (5) is fixedly connected with the first shell (61) through bolts, the turbine shaft (2) is arranged in an inner hole of the guide wheel seat (5), one end of the turbine shaft is positioned in a pump hub (3), a driving chain wheel (4) is arranged on the guide wheel seat (5) through a bearing, the driving chain wheel (4) is in transmission fit with the PTO shaft (9) through the chain (7), the input shaft (14), an idler shaft (16) and an output shaft (17) are in meshing transmission through gears, the gear assembly comprises a gear shaft (21) and a spiral bevel driven gear (22), two ends of the gear shaft (21) are rotatably arranged in a second shell (62) through first bearings respectively, and a meshing tooth part is formed on the circumferential surface of one end of the gear shaft (21), spiral shell umbrella driven gear (22) cover is established at the tooth axle (21) other end and is passed through spline transmission with tooth axle (21), still the cover is equipped with bush (23) between spiral shell umbrella driven gear (22) and the meshing tooth portion, and bush (23) one side offsets with meshing tooth portion, and the opposite side offsets with spiral shell umbrella driven gear (22), the opposite side of spiral shell umbrella driven gear (22) offsets with the inner circle inboard of first bearing, the both ends of tooth axle (21) all are fixed with packing ring (27) through the bolt, and packing ring (27) offset with the inner circle outside of first bearing, spiral shell umbrella driven gear (22) and output shaft (17) transmission fit, tooth axle (21) and differential mechanism assembly transmission fit.

2. The gearbox according to claim 1, characterized in that the pump hub (3) is fixedly connected with the torque converter (1) by welding, the drive sprocket (4) is stepped, and bearings are arranged between the drive sprocket (4) and the first housing (61) and between the drive sprocket and the guide wheel seat (5).

3. The gearbox according to claim 1, characterised in that the PTO shaft (9) is further provided with a driven sprocket (8), and the driven sprocket (8) is splined to the PTO shaft (9), and the driven sprocket (8) is drivingly connected to the drive sprocket (4) by a chain (7).

4. The gearbox according to claim 1, characterized in that a gear shaft end cover (30) is further arranged on the second housing (62) at the gear shaft (21), an adjusting pad (24) is further arranged between the first bearing and the gear shaft end cover (30), and an O-shaped sealing ring (25) is further arranged between the gear shaft end cover (30) and the second housing.

5. The transmission structure of a transmission output shaft and a differential assembly according to claim 4, characterized in that the inner side of the outer ring of the first bearing abuts against the second housing (62) and the outer side abuts against the pinion end cover (30).

6. The gearbox according to claim 1, characterized in that the first bearing is a tapered roller bearing (26), and a stop washer (29) is further provided between the bolt and a washer (27).

7. The gearbox according to claim 1, characterized in that a forward gear clutch (12) and a reverse gear clutch (13) are mounted on the input shaft (14), a forward gear (19) and a reverse gear (15) are mounted on the idler shaft (16), a second gear (18) and a third gear (20) are mounted on the output shaft (17), one end of the input shaft (14) is sleeved on the turbine shaft (2) through a spline and the other end is rotatably mounted on a second housing (62), one end of the idler shaft (16) and one end of the output shaft (17) are rotatably mounted on the second housing (62) and the other end is rotatably mounted on a first housing (61), the forward gear clutch (12) is in transmission fit with the forward gear (19), and the reverse gear clutch (13) is in transmission fit with the reverse gear (15), the second gear (18) is meshed with the forward gear (12), and the third gear (20) is in transmission fit with the spiral bevel driven gear (22).

8. The gearbox according to claim 1, characterised in that both ends of the PTO shaft (9) are rotationally connected with the first housing (61) by deep groove ball bearings, and both ends of the input shaft (14) and the idler shaft (16) are rotationally connected with the first housing (61) and the second housing (62) by deep groove ball bearings, respectively.

9. The gearbox according to claim 1, characterised in that the output shaft (17) is rotatably connected at both ends to the first housing (61) by means of a deep groove ball bearing, a tapered roller bearing (26), respectively.

10. The gearbox according to claim 1, characterized in that an oil pump driving gear, an internal meshing oil pump (10) and an oil pump end cover (11) are sleeved on the PTO shaft (9), the internal meshing oil pump (10) is meshed with the oil pump driving gear, the internal meshing oil pump (10) and the oil pump end cover (11) are fixedly connected with the first shell (61), the PTO shaft (9) is provided with a first through hole along the axial direction of the PTO shaft, one end of the first through hole, close to the oil pump end cover (11), is provided with an internal spline and is a PTO interface, and the PTO interface is used for installing an external oil pump.

Technical Field

The invention relates to the technical field of forklifts, in particular to a gearbox.

Background

Due to the characteristics of stability and comfort of hydraulic drive, hydraulic drive is increasingly widely applied to various machines. The pressure of most mechanical hydraulic systems comes from a hydraulic pump, and the driving modes of the hydraulic pump are divided into two modes of direct driving of an engine and transmission of a belt pulley of the whole vehicle. The power take-off device is widely used in a small-tonnage forklift through a direct driving mode of a diesel engine, so that a PTO output interface used for driving a hydraulic pump needs to be designed on the diesel engine matched with the small-tonnage forklift to realize power transmission of the PTO.

Therefore, chinese patent publication No. CN111005999A discloses a transmission, which includes a first housing, a second housing, a differential assembly, a gear shift assembly, a torque converter assembly and a PTO assembly, where the torque converter assembly includes a hydraulic torque converter, a pump hub, a first gear and a turbine shaft, the hydraulic torque converter is connected to the gear shift assembly via the turbine shaft, the pump hub is fixedly connected to the hydraulic torque converter, and the first gear is fixedly connected to the pump hub; the PTO assembly comprises a guide wheel seat, an intermediate shaft and a PTO shaft, wherein an intermediate gear is sleeved on the intermediate shaft, the guide wheel seat is fixedly connected with the second shell, the guide wheel seat is sleeved on the turbine shaft, one end of the guide wheel seat is positioned in the pump hub, the intermediate gear is respectively meshed with the oil pump driven gear and the first gear, and the intermediate shaft is fixedly connected with the second shell.

In the scheme, the intermediate shaft and the intermediate gear are arranged in the gearbox shell, and the power of the first gear fixed with the pump hub is transmitted to the oil pump driven gear to further rotate the PTO shaft, so that the power transmission of the PTO is realized, but the technical problems of the invention are found by those skilled in the art in the using process: the mode that sets up jackshaft and intermediate gear in the casing for the inner structure of gear box shows slightly complicacy, increases the processing degree of difficulty and manufacturing cost, and the transmission of multiunit gear engagement can produce great noise.

In addition, the transmission between the output shaft of the gearbox and the differential assembly generally adopts a gear shaft and a spiral bevel driven gear on the gear shaft, wherein the spiral bevel driven gear is generally installed through a spline and the gear shaft, so that the spiral bevel driven gear has axial offset on the gear shaft after long-term use and the transmission efficiency is influenced; in the existing structure, the theoretical installation distance and the meshing backlash of the spiral bevel driven gear are difficult to adjust and calibrate.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a transmission having a PTO function, a simple structure, a stable transmission, and low noise.

In order to achieve the purpose, the invention adopts the following technical scheme:

the transmission comprises a first shell, a second shell, a transmission assembly, a differential assembly, an input shaft, an idler shaft, an output shaft and a gear assembly, wherein the first shell and the second shell are fixed with each other; the PTO assembly comprises a guide wheel seat, a PTO shaft and a chain, two ends of the PTO shaft are rotatably arranged in a first shell, the guide wheel seat is fixedly connected with the first shell through bolts, a turbine shaft is arranged in an inner hole of the guide wheel seat, one end of the turbine shaft is positioned in a pump hub, a driving sprocket is arranged on the guide wheel seat through a bearing, the driving sprocket and the PTO shaft are in transmission fit through the chain, an input shaft, an idler shaft and an output shaft are in meshing transmission through gears, the gear assembly comprises a gear shaft and a spiral bevel driven gear, two ends of the gear shaft are respectively arranged in a second shell through the rotation of the first bearing, a meshing tooth part is formed on the circumferential surface of one end of the gear shaft, the spiral bevel driven gear is sleeved at the other end of the gear shaft and is in spline transmission with the gear shaft, a bushing is further sleeved between the spiral bevel driven gear and the meshing tooth part, and one side of, the other side of the spiral bevel driven gear abuts against the spiral bevel driven gear, the other side of the spiral bevel driven gear abuts against the inner side of the inner ring of the first bearing, gaskets are fixed at two ends of the gear shaft through bolts and abut against the outer side of the inner ring of the first bearing, the spiral bevel driven gear is in transmission fit with the output shaft, and the gear shaft is in transmission fit with the differential assembly.

Preferably, the pump hub is fixedly connected with the hydraulic torque converter through welding, the driving sprocket is in a step shape, and bearings are arranged between the driving sprocket and the first shell as well as between the driving sprocket and the guide wheel seat.

Preferably, the PTO shaft is further provided with a driven sprocket, the driven sprocket is connected with the PTO shaft through a spline, and the driven sprocket is in transmission connection with the driving sprocket through a chain.

According to a preferable scheme, a gear shaft end cover is further arranged at the gear shaft position on the second shell, an adjusting pad is further arranged between the first bearing and the gear shaft end cover, and an O-shaped sealing ring is further arranged between the gear shaft end cover and the second shell.

Preferably, the inner side of the outer ring of the first bearing abuts against the second housing, and the outer side of the outer ring of the first bearing abuts against the gear shaft end cover.

Preferably, the first bearing is a tapered roller bearing, and a stop washer is further arranged between the bolt and the washer.

According to a preferable scheme, a forward gear clutch and a backward gear clutch are mounted on the input shaft, a forward gear and a backward gear are mounted on the idler shaft, a second gear and a third gear are mounted on the output shaft, one end of the input shaft is sleeved on the turbine shaft through a spline, the other end of the input shaft is rotatably mounted on the second shell, one ends of the idler shaft and the output shaft are rotatably mounted on the second shell, the other end of the idler shaft and the output shaft are rotatably mounted on the first shell, the forward gear clutch is in transmission fit with the forward gear, the backward gear clutch is in transmission fit with the backward gear, the second gear is meshed with the forward gear, and the third gear is in transmission fit with the spiral bevel driven gear.

Preferably, two ends of the PTO shaft are rotatably connected with the first shell through deep groove ball bearings, and two ends of the input shaft and two ends of the idler shaft are respectively rotatably connected with the first shell and the second shell through deep groove ball bearings.

Preferably, two ends of the output shaft are rotatably connected with the first shell through a deep groove ball bearing and a tapered roller bearing respectively.

According to the preferable scheme, an oil pump driving gear, an inner meshing oil pump and an oil pump end cover are sleeved on the PTO shaft, the inner meshing oil pump is meshed with the oil pump driving gear, the inner meshing oil pump and the oil pump end cover are fixedly connected with a first shell, a first through hole is formed in the PTO shaft along the axis direction of the PTO shaft, an inner spline is arranged at one end, close to the oil pump end cover, of the first through hole, the first through hole is a PTO interface, and the PTO interface is used for.

Preferably, the oil pump end cover is positioned outside the internal meshing oil pump.

Compared with the prior art, the invention has the beneficial effects that:

the driving chain wheel fixed with the pump hub is in transmission connection with the driven chain wheel on the PTO shaft through the chain, so that power on the hydraulic torque converter can be transmitted to the PTO shaft, the PTO output function is realized, an intermediate shaft and an intermediate gear are omitted, the internal structure of the gear box is simplified, and compared with gear meshing transmission, the chain transmission is adopted, so that the power transmission is reliable, and the noise is low; the invention improves the installation structure of the gear shaft and the spiral bevel driven gear, so that two ends of the spiral bevel driven gear are respectively abutted against the bushing and the gasket, thereby ensuring that the spiral bevel driven gear cannot axially move on the gear shaft, ensuring the transmission efficiency, avoiding the gap between the spiral bevel driven gear and the gear shaft caused by the abrasion of the bearing, avoiding the noise generated in the reversing process of the gearbox, and simultaneously reducing the abrasion of the gear.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

FIG. 1 is a schematic cross-sectional view of a transmission assembly, an input shaft, an idler shaft, an output shaft, and gear components of a transmission;

FIG. 2 is a schematic cross-sectional view of an output shaft and differential assembly of the transmission.

Wherein the reference numerals are: 1. a hydraulic torque converter; 2. a turbine shaft; 3. a pump hub; 4. a drive sprocket; 5. a guide wheel seat; 61. a first housing; 62. a second housing; 7. a chain; 8. a driven sprocket; 9. a PTO shaft; 10. an internal engagement oil pump; 11. an oil pump end cover; 12. a forward clutch; 13. a reverse gear clutch; 14. an input shaft; 15. a reverse gear; 16. an idler shaft; 17. an output shaft; 18. a second gear; 19. a forward gear; 20. a third gear; 21. a gear shaft; 22. a spiral bevel driven gear; 23. a bushing; 24. an adjustment pad; 25. an O-shaped sealing ring; 26. a tapered roller bearing; 27. a gasket; 28. a bolt; 29. a stop washer; 40. a differential assembly.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, elements, and/or combinations thereof, unless the context clearly indicates otherwise.

Further, in the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The invention will be further illustrated with reference to the following examples and drawings:

as shown in fig. 1 and 2, the present embodiment provides a transmission comprising a first housing 61 and a second housing 62 fixed to each other, a transmission assembly 40 installed in the first housing 61, and a differential assembly, an input shaft 14, an idler shaft 16, an output shaft 17 and a gear assembly installed in the second housing 62, wherein the transmission assembly comprises a torque converter assembly and a PTO assembly, the torque converter assembly comprises a hydraulic torque converter 1, a pump hub 3, a driving sprocket 4 and a turbine shaft 2, the pump hub 3 is fixedly connected with a pump wheel on the hydraulic torque converter 1, and the driving sprocket 4 is connected with the pump hub 3 through spline transmission; the PTO assembly comprises a guide wheel seat 5, a PTO shaft 9 and a chain 7, wherein an oil pump driving gear, an internal engaged oil pump 10 and an oil pump end cover 11 are sleeved on the PTO shaft 9, the internal engaged oil pump 10 is engaged with the oil pump driving gear, the internal engaged oil pump 10 and the oil pump end cover 11 are fixedly connected with a first shell 61, a first through hole is formed in the PTO shaft 9 along the axis direction of the PTO shaft, an internal spline is arranged at one end, close to the oil pump end cover 11, of the first through hole, the first through hole is a PTO interface, the PTO interface is used for installing an external oil pump, and the; the two ends of the PTO shaft 9 are rotatably arranged in the first shell 61, the guide wheel seat 5 is fixedly connected with the first shell 61 through bolts, the turbine shaft 2 is arranged in an inner hole of the guide wheel seat 5, one end of the turbine shaft is positioned in the pump hub 3, the driving sprocket 4 is arranged on the guide wheel seat 5 through a bearing, and the driving sprocket 4 and the PTO shaft 9 are in transmission fit through a chain 7.

The pump hub 3 is fixedly connected with the hydraulic torque converter 1 through welding, the driving sprocket 4 is step-shaped, and bearings are arranged between the driving sprocket 4 and the first shell 61 and between the driving sprocket 4 and the guide wheel seat 5. The PTO shaft 9 is also provided with a driven chain wheel 8, the driven chain wheel 8 is connected with the PTO shaft 9 through a spline, and the driven chain wheel 8 is in transmission connection with the driving chain wheel 4 through a chain 7.

The input shaft 14, the idler shaft 16 and the output shaft 17 are in meshing transmission through gears, the input shaft 14 is provided with a forward gear clutch 12 and a reverse gear clutch 13, a forward gear 19 and a backward gear 15 are arranged on the idler shaft 16, a second gear 18 and a third gear 20 are arranged on the output shaft 17, one end of the input shaft 14 is sleeved on the turbine shaft 2 through a spline and the other end is rotatably installed on the second housing 62, the idler shaft 16 and the output shaft 17 have one end rotatably mounted on the second housing 62 and the other end rotatably mounted on the first housing 61, the forward gear clutch 12 is in transmission fit with the forward gear 19, the reverse gear clutch 13 is in transmission fit with the reverse gear 15, the second gear 18 is meshed with the forward gear 12, and the third gear 20 is in transmission fit with the spiral bevel driven gear 22.

As shown in fig. 2, the gear assembly includes a gear shaft 21 and a spiral driven gear 22, both ends of the gear shaft 21 are rotatably disposed in the second housing 62 through first bearings, a meshing tooth part is formed on the circumferential surface of one end of the gear shaft 21, the spiral bevel driven gear 22 is sleeved on the other end of the gear shaft 21 and is in spline transmission with the gear shaft 21, a lining 23 is further sleeved between the spiral bevel driven gear 22 and the meshing tooth part, one side of the bush 23 is abutted against the meshing tooth part, the other side is abutted against the spiral bevel driven gear 22, the other side of the spiral bevel driven gear 22 is abutted against the inner side of the inner ring of the first bearing, gaskets 27 are fixed at both ends of the gear shaft 21 through bolts, and the washer 27 is pressed against the outer side of the inner ring of the first bearing, the spiral bevel driven gear 22 is in transmission fit with the output shaft 17, and the gear shaft 21 is in transmission fit with a large gear ring arranged on the differential assembly.

A gear shaft end cover 30 is further arranged at the position, located at the gear shaft 21, of the second shell 62, an adjusting pad 24 is further arranged between the first bearing and the gear shaft end cover 30, the inner side of the outer ring of the first bearing abuts against the second shell 62, and the outer side of the outer ring of the first bearing abuts against the gear shaft end cover 30. An O-shaped sealing ring 25 is further arranged between the gear shaft end cover 30 and the second shell. The first bearing is a tapered roller bearing 26, and a stop washer 29 is arranged between the bolt and the washer 27.

Two ends of the PTO shaft 9 are rotatably connected with the first shell 61 through deep groove ball bearings, and two ends of the input shaft 14 and the idler shaft 16 are respectively rotatably connected with the first shell 61 and the second shell 62 through deep groove ball bearings. And two ends of the output shaft 17 are respectively connected with the first shell 61 through a deep groove ball bearing and a tapered roller bearing 26 in a rotating way.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments without departing from the principle and spirit of the present invention, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the technical scope of the present invention.