CN219510121U

CN219510121U - Hydraulic gear shifting mechanism for climbing gear of tractor

Info

Publication number: CN219510121U
Application number: CN202320510348.XU
Authority: CN
Inventors: 严颖波; 张毅; 邱辉鹏; 王子龙; 张笑; 仲维康
Original assignee: Shaanxi Fast Auto Drive Group Co Ltd
Current assignee: Shaanxi Fast Auto Drive Group Co Ltd
Priority date: 2023-03-15
Filing date: 2023-03-15
Publication date: 2023-08-11
Anticipated expiration: 2033-03-15

Abstract

The utility model discloses a hydraulic gear shifting mechanism for a tractor, which belongs to the technical field of gear shifting structures and comprises a two-position four-way electromagnetic valve, a throttle valve and a gear shifting oil cylinder, wherein the two-position four-way electromagnetic valve is connected with the throttle valve through an oil passage of a transmission shell, the throttle valve is connected to the gear shifting oil cylinder through an oil passage of the oil cylinder shell, hydraulic oil is controlled to flow through different lines by utilizing the two-position four-way electromagnetic valve so as to realize gear shifting, electrohydraulic control is adopted, the operation is simple, and the throttle valve is arranged in the oil passage of the oil cylinder shell and is used for controlling the flow of hydraulic oil, so that the impact during gear shifting is reduced.

Description

Hydraulic gear shifting mechanism for climbing gear of tractor

Technical Field

The utility model belongs to the technical field of gear shifting structures, and particularly relates to a hydraulic gear shifting mechanism for a tractor.

Background

The tractor needs to work under severe conditions frequently, and the climbing gear mechanism is added to further increase the traction force of the whole vehicle, so that the use requirement is met. The climbing gear mechanism is an important structure of a tractor gearbox, and the convenience and the flexibility of the operation are particularly important.

The tractor gearbox mainly adopts mechanical gear shifting, and the principle of the gear climbing mechanism is as follows: one end of the gear shifting rod is rigidly connected with the pull rod, one end of the gear shifting rod is rigidly connected with the gear shifting head, the other end of the gear shifting head is connected with the gear shifting fork, and when gear shifting is needed, torque can be transmitted to the gear shifting head to shift the gear shifting fork by pulling the pull rod. The gear shifting mechanism is simple in structure, has certain defects, is limited in gear shifting force required by a driver for mechanical gear shifting, is relatively complex in gear shifting operation, and is low in operation efficiency.

Disclosure of Invention

The utility model aims to provide a hydraulic gear shifting mechanism for a tractor to overcome the defects of large gear shifting force and complex gear shifting operation of the tractor in the prior art.

In order to solve the problems, the utility model adopts the following technical scheme:

the utility model provides a tractor climbs fender hydraulic pressure gearshift, includes two-position four-way solenoid valve, choke valve and climbs and keeps off the hydro-cylinder, two-position four-way solenoid valve is connected with the choke valve through the derailleur casing oil duct, and the choke valve passes through hydro-cylinder casing oil duct to be connected on climbing keeps off the hydro-cylinder.

Further, a piston is arranged in the climbing oil cylinder, one side of the piston is connected with a piston shaft, and the piston shaft are of an integrated structure.

Further, a shifting fork is fixed on the piston shaft.

Further, a sealing ring is arranged on the piston.

Further, the two-position four-way electromagnetic valve comprises an electromagnetic valve P port, an electromagnetic valve A1 port, an electromagnetic valve A2 port and an electromagnetic valve T port, the throttle valve is arranged in an oil duct of the oil cylinder shell, and the throttle valve comprises a first throttle valve and a second throttle valve.

Further, the opening of the electromagnetic valve A1 is communicated with the first throttle valve, and the opening of the electromagnetic valve A2 is communicated with the second throttle valve.

Further, one end of the two-position four-way electromagnetic valve is connected with a valve block, a valve block oil duct is arranged in the valve block, and the valve block oil duct is communicated with an electromagnetic valve P port.

Further, the electromagnetic valve T port is arranged at the end part of the two-position four-way electromagnetic valve.

Compared with the prior art, the utility model has the following beneficial technical effects:

according to the hydraulic gear shifting mechanism for the tractor, hydraulic oil is controlled to flow through different lines by utilizing the two-position four-way electromagnetic valve so as to realize gear shifting, electrohydraulic control is adopted, the operation is simple, automatic gear shifting is convenient to realize, and meanwhile, the throttle valve is arranged in an oil duct of the oil cylinder shell and is used for controlling the flow of the hydraulic oil, so that the impact during gear shifting is reduced.

Preferably, a piston shaft and a shifting fork shaft in the climbing oil cylinder are the same shaft, a shifting fork is connected to the piston shaft, and the shifting fork can be driven to move left and right to realize gear shifting when the piston shaft moves.

Drawings

Fig. 1 is a hydraulic gear shifting structure diagram of a tractor in an embodiment of the utility model.

Fig. 2 is a schematic diagram of a throttle valve of a hydraulic shift mechanism for a tractor in an embodiment of the utility model.

In the figure, 1, a piston shaft; 2. a shifting fork; 3. a throttle valve; 4. a two-position four-way electromagnetic valve; 5. a P port of the electromagnetic valve; 6. a solenoid valve A1 port; 7. a piston; 8. a climbing oil cylinder; 9. a valve block; 10. a T port of the electromagnetic valve; 11. a solenoid valve A2 port; 12. a seal ring; 13. an oil passage of the transmission case; 14. oil duct of oil cylinder shell; 15. a valve block oil passage; 3-1, a first throttle valve; 3-2, a second throttle valve.

Detailed Description

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

As shown in fig. 1, the hydraulic gear shifting mechanism for the tractor comprises a two-position four-way electromagnetic valve 4, a throttle valve 3 and a gear climbing oil cylinder 8, wherein the throttle valve 3 is connected with the two-position four-way electromagnetic valve 4 through a transmission shell oil duct 13, and the throttle valve 3 is connected to the gear climbing oil cylinder 8 through an oil cylinder shell oil duct 14.

Specifically, the two oil channels 13 and 14 of the transmission shell are respectively provided with two throttle valves 3 in the two oil channels 14 of the oil cylinder shell for controlling the flow of oil in the oil channels and reducing gear shifting impact, the two-position four-way electromagnetic valve 4 is used for controlling the in-out route of the oil so as to control the position of the oil entering the climbing oil cylinder 8 and realize the gear shifting function, and compared with the traditional climbing control mechanism, the structure realizes the gear shifting function only by electrohydraulic control, has simpler structure and is convenient for realizing automatic gear shifting.

As shown in fig. 1, a piston 7 is arranged in a climbing oil cylinder 8, one side of the piston 7 is connected with a piston shaft 1, the piston 7 and the piston shaft 1 are of an integrated structure, a shifting fork 2 is fixed on the piston shaft 1, and a sealing ring is arranged on the piston 7.

Specifically, be equipped with the piston chamber in climbing fender hydro-cylinder 8, the fluid chamber is seal structure, and inside is equipped with piston 7, and piston shaft 1 are integral type structure, still install shift fork 2 on the piston shaft 1, and the in-process of shifting, piston 7 drive piston shaft 1 and then drive shift fork 2 motion realize shifting, still install sealing washer 12 on the piston 7, make piston 7 both sides piston chamber keep sealed.

The two-position four-way electromagnetic valve 4 comprises an electromagnetic valve P port 5, an electromagnetic valve A1 port 6, an electromagnetic valve A2 port 11 and an electromagnetic valve T port 10, the throttle valve 3 is arranged in an oil cylinder shell oil duct 14, the throttle valve 3 comprises a first throttle valve 3-1 and a second throttle valve 3-2, the electromagnetic valve A1 port 6 is communicated with the first throttle valve 3-1, and the electromagnetic valve A2 port 11 is communicated with the second throttle valve 3-2; the electromagnetic valve P port 5, the electromagnetic valve A1 port 6 and the electromagnetic valve A2 port 11 are arranged on two sides of the two-position four-way electromagnetic valve 4, the electromagnetic valve T port 10 is positioned at the end part of the two-position four-way electromagnetic valve 4, the electromagnetic valve T port 10 is an oil outlet, and oil flowing out of the electromagnetic valve T port 10 can flow into a gearbox mailbox along a corresponding oil duct.

In addition, the two-position four-way electromagnetic valve 4 is inserted and installed on the valve block 9, a valve block oil passage 15 is arranged in the valve block 9, and the valve block oil passage 15 is communicated with the electromagnetic valve P port 5 and is used for enabling oil to enter the two-position four-way electromagnetic valve 4.

Examples

The opening 6 of the electromagnetic valve A1 is communicated with the oil inlet 12 on the left side of the climbing oil cylinder 8 through the first throttle valve 3-1, and the opening 11 of the electromagnetic valve A2 is communicated with the oil inlet 12 on the right side of the climbing oil cylinder 8 through the second throttle valve 3-2. The oil flows into the two-position four-way electromagnetic valve 4 from the valve block oil passage 15 through the electromagnetic valve P port 5,

when the vehicle starts, the two-position four-way electromagnetic valve 4 is not electrified, the valve core is positioned at the left position, hydraulic oil enters a left piston cavity of the climbing oil cylinder 8 through the first throttle valve 3-1 through the opening 6 of the electromagnetic valve A1, the piston shaft 1 is pushed to move rightwards to a right end limiting position of the climbing oil cylinder 8, the piston shaft 1 and the climbing shifting fork 2 fixed on the piston shaft are driven to move rightwards, corresponding gear shifting actions are completed, meanwhile, oil in the right piston cavity of the climbing oil cylinder 8 flows out from the right piston cavity of the climbing oil cylinder 8 under the extrusion of the piston 7, flows into the opening 11 of the electromagnetic valve A2 through the second throttle valve 3-2 and flows out from the opening 10 of the electromagnetic valve T, and overflows to a gearbox oil tank along a corresponding oil duct.

When the gear is shifted, the two-position four-way electromagnetic valve 4 is electrified, the valve core is positioned at the right position, hydraulic oil enters a piston cavity on the right side of the gear-climbing oil cylinder 8 through the second throttle valve 3-2 via the opening 11 of the electromagnetic valve A2, the piston shaft 1 is pushed to move leftwards to a limit position with the left end of the gear-climbing oil cylinder 8, the piston shaft 1 and the gear-climbing shifting fork 2 fixed on the piston shaft are driven to move leftwards, and corresponding gear shifting actions are completed. Meanwhile, oil in the left piston cavity of the climbing oil cylinder 8 flows out from the left piston cavity of the climbing oil cylinder 8 under the extrusion of the piston 7, flows through the first throttle valve 3-1, enters the electromagnetic valve A1 port 6 and flows out from the electromagnetic valve T port 10, and overflows to a gearbox oil tank along the corresponding oil duct.

The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model.

Claims

1. The utility model provides a tractor climbs fender hydraulic pressure gearshift, its characterized in that includes two-position four-way solenoid valve (4), choke valve (3) and climbs fender hydro-cylinder (8), two-position four-way solenoid valve (4) are connected with choke valve (3) through derailleur casing oil duct (13), and choke valve (3) are connected on climbing fender hydro-cylinder (8) through hydro-cylinder casing oil duct (14).

2. The hydraulic gear shifting mechanism for the tractor gear climbing disclosed by claim 1 is characterized in that a piston (7) is arranged in the gear climbing cylinder (8), one side of the piston (7) is connected with a piston shaft (1), and the piston (7) and the piston shaft (1) are of an integrated structure.

3. A hydraulic gear shifting mechanism for climbing a tractor according to claim 2, wherein a shifting fork (2) is fixed on the piston shaft (1).

4. A hydraulic gear shifting mechanism for tractor climbing as in claim 2, characterized in that the piston (7) is provided with a sealing ring (12).

5. The hydraulic gear shifting mechanism for climbing tractor according to claim 1, wherein the two-position four-way solenoid valve (4) comprises a solenoid valve P port (5), a solenoid valve A1 port (6), a solenoid valve A2 port (11) and a solenoid valve T port (10), the throttle valve (3) is arranged in an oil cylinder shell oil duct (14), and the throttle valve (3) comprises a first throttle valve (3-1) and a second throttle valve (3-2).

6. The hydraulic tractor gear-shifting mechanism according to claim 5, wherein the opening (6) of the electromagnetic valve A1 is communicated with the first throttle valve (3-1), and the opening (11) of the electromagnetic valve A2 is communicated with the second throttle valve (3-2).

7. The hydraulic gear shifting mechanism for climbing a tractor according to claim 5 is characterized in that one end of the two-position four-way electromagnetic valve (4) is connected with a valve block (9), a valve block oil duct (15) is arranged in the valve block (9), and the valve block oil duct (15) is communicated with the electromagnetic valve P port (5).

8. The hydraulic shifting mechanism for climbing tractor gear according to claim 5, wherein the electromagnetic valve T-port (10) is arranged at the end of the two-position four-way electromagnetic valve (4).