CN212509411U - Parallel hydrostatic stepless speed change transmission mechanism of gardening tractor - Google Patents

Parallel hydrostatic stepless speed change transmission mechanism of gardening tractor Download PDF

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Publication number
CN212509411U
CN212509411U CN202021142454.XU CN202021142454U CN212509411U CN 212509411 U CN212509411 U CN 212509411U CN 202021142454 U CN202021142454 U CN 202021142454U CN 212509411 U CN212509411 U CN 212509411U
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hst
shaft
transmission
speed change
transmission shaft
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夏建林
祁士尧
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Yancheng Yanhai Tractor Manufacturing Co ltd
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Yancheng Yanhai Tractor Manufacturing Co ltd
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Abstract

The utility model relates to a quiet hydraulic stepless speed change drive mechanism of parallel of horticulture tractor connects in parallel between one-level transmission shaft (17) and secondary drive axle (18) of conventional mechanical type running gear and sets up HST drive mechanism, and quiet hydraulic stepless speed change device (5) overhead in the top outside of box. The top HST type agricultural greenhouse has the advantages that the structural arrangement of the box body is improved, the width of the box body is reduced, and the HST type agricultural greenhouse is suitable for operation in narrow gardening and other farmlands with narrow row spacing; the HST transmission mechanism and the mechanical walking mechanism are arranged in parallel, and can be switched randomly according to needs to meet the operation requirements under different working conditions and realize flexible hydrostatic stepless speed change of the tractor.

Description

Parallel hydrostatic stepless speed change transmission mechanism of gardening tractor
Technical Field
The utility model relates to agricultural machinery, in particular to a parallel hydrostatic stepless speed change transmission mechanism of a gardening tractor.
Background
At present, the tractor gearbox mainly comprises a mechanical direct-coupled gearbox and a hydrostatic stepless transmission gearbox. The mechanical direct-coupled gearbox has high transmission efficiency, but needs skillful operation of an accelerator, a clutch and gears, and is complex to operate. Particularly, when the tractor operates in sloping fields such as hilly mountains and tea gardens, the tractor needs to provide large torque to crawl, and the mechanical direct-coupled gearbox easily causes abnormal wear of the clutch, and leads to flameout of the engine in severe cases. The traditional pure mechanical transmission can not meet the driving requirement.
The hydrostatic stepless transmission gearbox is characterized in that a hydrostatic stepless speed change transmission device (HST) is connected to a power input end on the basis of the existing mechanical direct-coupled gearbox, so that pure mechanical transmission becomes more flexible, the operation is simple, the noise is low, the traveling speed can be adjusted in a stepless manner, large-torque driving can be provided without causing flameout of an engine, the tractor can be guaranteed to travel more flexibly under various severe working conditions, and the hydrostatic stepless speed change gearbox is widely applied to the production and manufacturing processes of agricultural machinery at present. Hydrostatic stepless speed change is widely applied to small automobiles, and a hydrostatic stepless speed change transmission device (abbreviated as SHT) is introduced into a tractor gearbox, which is the research direction of the design of a flexible gearbox in the future.
The hydrostatic stepless speed change transmission device has good flexibility and simple and convenient operation, but has low transmission efficiency and high oil consumption when working under the conditions of low speed and stable farmland conditions for a long time, so that the temperature of hydraulic oil is increased quickly. The traditional mechanical direct-coupled gearbox can ensure low-speed and constant-speed running, and has high transmission efficiency and stable operation effect.
Due to the limitations of overall size, structure and available space, it is very difficult to re-implant a hydrostatic continuously variable transmission (SHT) in the available space. In order to keep the overall size of the gearbox of the existing tractor unchanged, most of the current designs are that a hydrostatic continuously variable transmission (SHT) is arranged on the side surface of the gearbox. The design is not suitable for the tractor with no special limitation on the lateral dimension of the whole tractor, but obviously is not suitable for the tractor with strict limitation on the lateral width. The side mounted hydrostatic infinitely variable transmission can significantly increase the width of the box assembly, making the work machine unsuitable for use in narrow gardening and other narrow row spacing farmlands.
In recent years, the company designs a narrow-width small-sized crawler tractor suitable for operating in a tea garden, and the overall outline width of the tractor needs to be less than 80CM due to the limitation of 80CM line spacing of the tea garden. Obviously, for the small-sized track-type tractor with narrow width, if a hydrostatic continuously variable transmission (SHT) is to be connected again, the other sides except the top of the gearbox cannot be arranged.
Disclosure of Invention
The utility model aims to solve the technical problem that the problem that exists to above-mentioned prior art provides a quiet hydraulic stepless speed change drive mechanism of horticulture tractor parallel suitable for tea garden operation, makes the tractor can be according to the operation needs, by the handle gear shift, selects mechanical type transmission and quiet hydraulic stepless speed change transmission.
The utility model adopts the technical proposal that the device comprises a walking mechanism and a power output mechanism, wherein the walking mechanism comprises a primary transmission shaft (17), a secondary transmission shaft (18), a tertiary transmission shaft (19), a brake steering shaft (20), a four-stage transmission shaft (21) and a walking wheel shaft (22); the power output mechanism comprises a power input shaft (1), a straight gear (14) and a power output shaft (23); the power from the engine is transmitted to the running mechanism and the power output mechanism by the power input shaft (1) through the bevel gear III (16) and the straight gear (14) respectively to drive the tractor to run and output power, and the power-driven tractor is characterized in that: the traveling mechanism also comprises a group of HST transmission mechanisms, and the HST transmission mechanisms are connected between a primary transmission shaft (17) and a secondary transmission shaft (18) of the traveling mechanism in parallel; a hydrostatic stepless speed change device (5) in the HST transmission mechanism is arranged on the outer side of the top end of a transmission box body (24), and an HST input shaft (4) and an HST output shaft (7) of the hydrostatic stepless speed change device extend into the transmission box body (24) and are respectively connected with a primary transmission shaft (17) and a secondary transmission shaft (18).
The HST transmission mechanism comprises a hydrostatic stepless speed change device (5), and an HST input transmission shaft (2), an HST output transmission shaft (8) and an HST output transition shaft (9) which are respectively connected with an HST input shaft (4) and an HST output shaft (7) of the hydrostatic stepless speed change device (5); an HST input shaft (4) of the hydrostatic stepless speed change device (5) is connected with a primary transmission shaft (17) in the traveling mechanism through a bevel gear I (3), an HST input transmission shaft (2) and a transition gear (26); an HST output shaft (7) of the hydrostatic continuously variable transmission device (5) is connected with a secondary transmission shaft (18) in the traveling mechanism through a bevel gear II (6), an HST output transmission shaft (8) and an HST output transition shaft (9), so that hydrostatic flexible continuously variable transmission of the gearbox is realized.
An HST shifting fork (10) used for controlling connection or disconnection with the HST transmission mechanism and a high-low speed shifting fork (12) used for controlling high-low gear walking of the walking mechanism are arranged on the secondary transmission shaft (18); an output shaft shifting fork (15) which is used for controlling the connection or disconnection with the power input shaft (1) is arranged on the power output shaft (23).
One end of an HST shifting fork (10) is supported on the box body (24) through an HST shifting fork shaft (11), and one end of a high-speed shifting fork (12) and one end of a low-speed shifting fork (12) are supported on the box body (24) through a high-speed shifting fork shaft (13) and are respectively adjusted by shifting fork handles.
The utility model discloses with the advantage that prior art relative ratio possessed: firstly, the arrangement mode of the top-mounted HST improves the structural arrangement of the box body, greatly reduces the width of the box body, and is suitable for operation in narrow gardening and other farmlands with narrow row spacing; and secondly, the parallel type mechanical-hydraulic hybrid power drive can be switched randomly according to different terrain operation requirements, meet the requirements of different working conditions and improve the fuel efficiency of the engine.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
fig. 3 is a sectional view taken along line B-B of fig. 1.
Reference numbers in the figures: 1-power input shaft, 2-HST input transmission shaft, 3-bevel gear I, 4-HST input shaft, 5-hydrostatic continuously variable transmission (HST), 6-bevel gear II, 7-HST output shaft, 8-HST output transmission shaft, 9-HST output transition shaft, 10-HST shifting fork, 11-HST shifting fork shaft, 12-high and low speed shifting fork, 13-high and low speed shifting fork shaft, 14-straight gear, 15-output shaft shifting fork, 16-bevel gear III, 17-primary transmission shaft, 18-secondary transmission shaft, 19-tertiary transmission shaft, 20-brake steering shaft, 21-quaternary transmission shaft, 22-traveling wheel shaft, 23-power output shaft, 24-box body, 25-transmission gear, 26-transition gear, 27-intermediate gear.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The utility model relates to a parallel hydrostatic stepless speed change transmission mechanism of a gardening tractor, which comprises a walking mechanism, a power output mechanism and an HST transmission mechanism.
The power output mechanism is composed of a power input shaft 1, a straight gear 14 and a power output shaft 23, wherein the power output shaft 23 is arranged at the lower side of the walking mechanism, the front end of the power output mechanism is connected with the power input shaft 1 through the straight gear 14, and the tail end of the power output mechanism serving as a power output end extends out of the box body 24.
The walking mechanism comprises a primary transmission shaft 17, a secondary transmission shaft 18, a tertiary transmission shaft 19, a brake steering shaft 20, a quaternary transmission shaft 21 and a walking wheel shaft 22, and power is input by a power input shaft 1 to drive the whole machine to walk and brake to steer.
The HST transmission mechanism is arranged between the primary transmission shaft 17 and the secondary transmission shaft 18 of the travelling mechanism in parallel, so that the travelling mechanism realizes flexible hydrostatic stepless speed change.
Power from the engine is input by the power input shaft 1, and is transmitted to the travelling mechanism and the power output mechanism through the bevel gear III 16 and the straight gear 14 respectively, so that the travelling and the power output of the tractor are realized. The traveling mechanism is provided with a group of HST transmission mechanisms in parallel on the basis of the traditional mechanical transmission. According to production needs, the traditional mechanical transmission or the HST hydrostatic stepless speed change transmission can be selectively switched through the HST shifting fork 10.
The HST transmission mechanism comprises an HST input transmission shaft 2, a bevel gear I3, an HST input shaft 4, a hydrostatic stepless speed change device 5, an HST output shaft 7, a bevel gear II 6, an HST output transmission shaft 8, an HST output transition shaft 9, a transition gear 26 and an intermediate gear 27, wherein the hydrostatic stepless speed change device 5 is arranged on the outer side of the top end of a box body 24, and the HST input shaft 4 and the HST output shaft 7 extend into the box body 29 and are connected with a primary transmission shaft 17 and a secondary transmission shaft 18 in a travelling mechanism in parallel. The HST input shaft 4 is connected with the primary transmission shaft 17 through a bevel gear I3, an HST input transmission shaft 2 and a transition gear 26; the HST output shaft 7 is connected with a secondary transmission shaft 18 in the traveling mechanism through a second bevel gear 6, an HST output transmission shaft 8, an HST output transition shaft 9 and an intermediate gear 27, so that hydrostatic flexible stepless speed change transmission of the gearbox is realized.
The secondary transmission shaft 18 is provided with an HST shifting fork 10 and a high-low speed shifting fork 12. The HST shifting fork 10 is used for selecting connection or disconnection of the HST transmission mechanism and the travelling mechanism; the high-low speed shifting fork 12 is used for selecting high and low gear traveling speeds in the mechanical traveling mechanism. The power output shaft 23 is provided with a shifting fork 15 for controlling the connection or disconnection of the power input shaft 1 and the power output shaft 23.
One end of the HST fork 10 is supported on the box body 24 through the HST fork shaft 11, and one end of the high-low speed fork 12 is supported on the box body 24 through the high-low speed fork shaft 13, and is respectively adjusted by shifting fork handles.
The primary transmission shaft 17 is provided with a transmission gear 25 directly connected with a high-low shift fork gear on the secondary transmission shaft 18, and the power on the primary transmission shaft 17 can be directly transmitted to the secondary transmission shaft 18 through the transmission gear 25, so that the traditional mechanical transmission of high and low speeds is realized.
When the HST fork 10 is in the coupled state, the hydrostatic continuously variable transmission 5 is started. At the moment, the power input shaft 1 drives the first-stage transmission shaft 17 to rotate through the bevel gear III 16, the first-stage transmission shaft 17 transmits power to the HST transmission mechanism through the transition gear 26 to carry out flexible hydrostatic stepless speed change, then the intermediate gear 27 transmits the power to the second-stage transmission shaft 18, and then the traveling wheels are driven through the third-stage transmission shaft 19, the brake steering shaft 20, the fourth-stage transmission shaft 21 and the traveling wheel shaft 22 to realize the traveling, steering and braking of the whole machine.
When the HST shifting fork 10 is in a neutral position, the intermediate gear 27 is disengaged from the shifting fork gear on the secondary transmission shaft 18, so that the HST transmission mechanism is disengaged from the traveling mechanism, and at the moment, the primary transmission shaft 17 and the secondary transmission shaft 18 in the traveling mechanism are directly connected through the transmission gear 25, so that the traditional mechanical transmission is realized.
The utility model discloses a HST drive mechanism couples with running gear parallel, and the top outside of box 24 is located to quiet hydraulic stepless speed change device 5 overhead, has practiced thrift the width of gearbox furthest.

Claims (4)

1. A parallel hydrostatic stepless speed change transmission mechanism of a gardening tractor comprises a traveling mechanism and a power output mechanism, wherein the traveling mechanism comprises a primary transmission shaft (17), a secondary transmission shaft (18), a tertiary transmission shaft (19), a brake steering shaft (20), a four-stage transmission shaft (21) and a traveling wheel shaft (22); the power output mechanism comprises a power input shaft (1), a straight gear (14) and a power output shaft (23); the power from the engine is transmitted to the running mechanism and the power output mechanism by the power input shaft (1) through the bevel gear III (16) and the straight gear (14) respectively to drive the tractor to run and output power, and the power-driven tractor is characterized in that: the traveling mechanism also comprises a group of HST transmission mechanisms, and the HST transmission mechanisms are connected between a primary transmission shaft (17) and a secondary transmission shaft (18) of the traveling mechanism in parallel; a hydrostatic stepless speed change device (5) in the HST transmission mechanism is arranged on the outer side of the top end of a transmission box body (24), and an HST input shaft (4) and an HST output shaft (7) of the hydrostatic stepless speed change device extend into the transmission box body (24) and are respectively connected with a primary transmission shaft (17) and a secondary transmission shaft (18).
2. A parallel hydrostatic continuously variable transmission of a garden tractor as defined in claim 1, wherein: the HST transmission mechanism comprises a hydrostatic stepless speed change device (5), and an HST input transmission shaft (2), an HST output transmission shaft (8) and an HST output transition shaft (9) which are respectively connected with an HST input shaft (4) and an HST output shaft (7) of the hydrostatic stepless speed change device (5); an HST input shaft (4) of the hydrostatic stepless speed change device (5) is connected with a primary transmission shaft (17) in the traveling mechanism through a bevel gear I (3), an HST input transmission shaft (2) and a transition gear (26); an HST output shaft (7) of the hydrostatic continuously variable transmission device (5) is connected with a secondary transmission shaft (18) in the traveling mechanism through a bevel gear II (6), an HST output transmission shaft (8) and an HST output transition shaft (9), so that hydrostatic flexible continuously variable transmission of the gearbox is realized.
3. A parallel hydrostatic continuously variable transmission of a garden tractor as defined in claim 1, wherein: an HST shifting fork (10) used for controlling connection or disconnection with the HST transmission mechanism and a high-low speed shifting fork (12) used for controlling high-low gear walking of the walking mechanism are arranged on the secondary transmission shaft (18); an output shaft shifting fork (15) which is used for controlling the connection or disconnection with the power input shaft (1) is arranged on the power output shaft (23).
4. A parallel hydrostatic continuously variable transmission of a garden tractor as defined in claim 1, wherein: one end of an HST shifting fork (10) is supported on the box body (24) through an HST shifting fork shaft (11), and one end of a high-speed shifting fork (12) and one end of a low-speed shifting fork (12) are supported on the box body (24) through a high-speed shifting fork shaft (13) and are respectively adjusted by shifting fork handles.
CN202021142454.XU 2020-06-19 2020-06-19 Parallel hydrostatic stepless speed change transmission mechanism of gardening tractor Active CN212509411U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021142454.XU CN212509411U (en) 2020-06-19 2020-06-19 Parallel hydrostatic stepless speed change transmission mechanism of gardening tractor

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Application Number Priority Date Filing Date Title
CN202021142454.XU CN212509411U (en) 2020-06-19 2020-06-19 Parallel hydrostatic stepless speed change transmission mechanism of gardening tractor

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CN202021142454.XU Active CN212509411U (en) 2020-06-19 2020-06-19 Parallel hydrostatic stepless speed change transmission mechanism of gardening tractor

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113175515A (en) * 2021-06-10 2021-07-27 温岭市明华齿轮有限公司 Tractor gearbox

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113175515A (en) * 2021-06-10 2021-07-27 温岭市明华齿轮有限公司 Tractor gearbox
WO2022257188A1 (en) * 2021-06-10 2022-12-15 温岭市明华齿轮有限公司 Tractor transmission

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