CN218510148U - Hydraulic proportional control tractor climbing gear shifting mechanism - Google Patents

Abstract

The utility model discloses a hydraulic pressure proportional control tractor climbs fender gearshift belongs to the technical field of the structure of shifting, including climbing the fender hydro-cylinder, the piston axle is worn to be established on climbing the fender hydro-cylinder, and the solenoid valve passes through the oil duct and communicates with the piston chamber who climbs the fender hydro-cylinder, and the piston housing is established on the piston axle, and through the different circuit of the flow through of solenoid valve control hydraulic oil and then realize keeping off the conversion of position, and shift and strike for a short time, be convenient for realize automatic shifting.

Description

Hydraulic proportional control tractor climbing gear shifting mechanism

Technical Field

The utility model belongs to the technical field of the structure of shifting, concretely relates to hydraulic pressure proportional control tractor climbs fender gearshift.

Background

The tractor needs often to work under adverse conditions, increases and climbs the fender mechanism and can further increase whole car traction force, satisfies the operation requirement. The climbing mechanism is used as an important structure of a gearbox of a tractor, and the operation convenience and flexibility of the climbing mechanism are particularly important.

The tractor gearbox mainly uses mechanical gear shifting as the main, climbs the fender mechanism principle as follows: gear level one end and pull rod rigid connection, one end and the shifting block rigid connection of shifting, the shifting block other end is connected the shift fork of shifting, when needs shift, only need stimulate the pull rod, just can shift the shifting block with the moment of torsion transmission and stir the shift fork and shift. The gear shifting mechanism is simple in structure, has certain defects, needs to be operated by a driver during mechanical gear shifting, is limited in gear shifting force, is relatively complex in gear shifting operation, and is relatively low in operation efficiency.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a hydraulic pressure proportional control tractor climbs fender gearshift to it is big to overcome prior art tractor and climb fender power of shifting, shifts the not enough of the operation ratio complicacy.

The utility model provides a hydraulic pressure proportional control tractor climbs fender gearshift, includes and climbs fender hydro-cylinder, solenoid valve, oil duct and piston shaft, be equipped with the oil duct between solenoid valve and the climbing fender hydro-cylinder, the piston shaft is worn to be established on climbing fender hydro-cylinder, and piston shaft one end is fixed with the shift fork, and the epaxial cover of piston is equipped with the piston, and there is the step form arch in the middle part of the piston shaft.

Furthermore, one end of the electromagnetic valve is connected with an electromagnetic valve seat, and the electromagnetic valve is installed on the electromagnetic valve seat.

Further, the solenoid valve includes a direct gear solenoid valve and an upward gear solenoid valve.

Further, the oil duct includes a first oil duct and a second oil duct, and the first oil duct and the second oil duct are respectively communicated with the climbing oil cylinder.

Furthermore, a piston cavity is arranged inside the climbing oil cylinder.

Furthermore, through holes are formed in the two sides of the climbing oil cylinder.

Furthermore, sealing rings are arranged in through holes at two ends of the climbing oil cylinder, and the sealing rings are sleeved on the piston shaft.

Furthermore, a step surface is arranged on the piston, and the piston is arranged on two sides of the middle protruding part of the piston shaft.

Compared with the prior art, the utility model discloses following profitable technological effect has:

the utility model relates to a hydraulic pressure proportional control tractor climbs fender gearshift, through wearing to establish the piston shaft climbing in keeping off the hydro-cylinder, the piston is established to the epaxial cover of piston, and the solenoid valve passes through the oil duct and communicates with the both sides of climbing the fender hydro-cylinder, and the action of change oil pressure control through the control current of adjusting the solenoid valve and installing the epaxial shift fork of piston realizes shifting the action, adopts electric hydraulic control, easy operation, and the impact of shifting is little, is convenient for realize automatic shifting.

Preferably, the three gears of direct gear, neutral gear and climbing gear are switched by controlling two electromagnetic valves.

Preferably, the middle part of the piston shaft is provided with a step-shaped bulge and a step surface on the piston, so that the piston can be ensured to be positioned in a middle position when the vehicle is in a neutral gear state, and the piston shaft and the shifting fork are driven to be positioned in the middle position.

Preferably, sealing rings are arranged in through holes at two ends of the climbing oil cylinder, and the sealing rings are sleeved on the piston shaft and used for ensuring the sealing performance of a piston cavity in the climbing oil cylinder.

Drawings

Fig. 1 is the embodiment of the utility model provides an in hydraulic pressure ratio control tractor climb and keep off shift mechanism picture.

In the figure, 1, a direct gear electromagnetic valve; 2. a gear-climbing electromagnetic valve; 3. an electromagnetic valve seat; 4. a first oil passage; 5. a second oil passage; 6. a gear-climbing oil cylinder; 7. a right piston chamber; 8. a left piston chamber; 9. a piston shaft; 10. a shifting fork; 11. a piston.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

As shown in figure 1, a hydraulic pressure proportional control tractor climbs fender gearshift, including climbing fender hydro-cylinder 6, climb and wear to be equipped with piston shaft 9 on the fender hydro-cylinder 6, there is the step form arch in the middle of piston shaft 9, protruding both sides cover is equipped with piston 11, climb and be connected through the oil duct between fender hydro-cylinder 6 and the solenoid valve, this structure utilizes the solenoid valve to pass through the oil duct and climb and keep off hydro-cylinder 6 and be connected, controls the motion that piston shaft 9 was come to the hydraulic pressure of climbing the 6 piston 11 both sides of hydro-cylinder through solenoid valve control, and then drives shift fork 10 side-to-side movement and realize shifting.

Specifically, the electromagnetic valve comprises a direct gear electromagnetic valve 1 and an ascending gear electromagnetic valve 2, and the two electromagnetic valves are both arranged on an electromagnetic valve seat 3; the oil duct includes first oil duct 4 and second oil duct 5, directly keeps off solenoid valve 1 and communicates with climbing oil cylinder 6 through first oil duct 4, climbs and keeps off solenoid valve 2 and communicates with climbing oil cylinder 6 through second oil duct 5.

The cavity inside the climbing oil cylinder 6 is a piston cavity, through holes are formed in two ends of the climbing oil cylinder 6, sealing rings are arranged in the through holes and used for being sleeved on a piston shaft 9 to keep the sealing performance of the piston cavity of the climbing oil cylinder 6, the piston cavity is divided into a left piston cavity 7 and a right piston cavity 8 according to the position of a piston, the diameter of the part, located in the piston cavity, of the piston shaft 9 is larger than that of the piston shaft 9 outside the piston cavity, a step-shaped bulge is arranged at the middle position of the piston shaft 9 in the piston cavity, correspondingly, the piston 11 is also provided with a corresponding step surface to be matched with the piston shaft 9, the piston 11 is located in a middle position when the electromagnetic valve 1 and the climbing electromagnetic valve 2 work simultaneously, the piston shaft 9 and a shifting fork 10 fixed on the piston shaft 9 are located in the middle position, and a vehicle is located in a neutral position.

Example 1

Direct fender solenoid valve 1 and climb fender solenoid valve 2 and be two three way solenoid valves, through first oil duct 4 and climb fender cylinder 6 left side intercommunication, climb fender solenoid valve 2 through second oil duct 5 with climb fender cylinder 6 right side solenoid valve intercommunication, piston shaft 9 can slide in climbing fender cylinder 6, the one end at piston shaft 9 is installed to shift fork 10.

When the vehicle starts, the direct gear electromagnetic valve 1 and the climbing gear electromagnetic valve 2 work simultaneously, hydraulic oil enters the corresponding piston cavities through the direct gear electromagnetic valve 1 and the climbing gear electromagnetic valve 2 through respective oil ducts, and the piston 11 is guaranteed to be located at the middle position by the design of the step surface on the piston 11, so that the piston shaft 9 and the shifting fork 10 are driven to be located at the middle position, and the vehicle is in a neutral gear state.

When direct fender solenoid valve 1 circular telegram alone, hydraulic oil gets into through first oil duct 4 through direct fender solenoid valve 1 and climbs the left side piston chamber 8 that keeps off hydro-cylinder 6, promotes piston 11 and moves right to climbing the right end limiting position of hydro-cylinder 6, drives piston shaft 9 and shift fork 10 and moves right, accomplishes the action of shifting, and the fluid in the right side piston chamber 7 of simultaneously climbing hydro-cylinder 6 overflows to the gearbox oil tank along with corresponding second oil duct 5 under the extrusion of piston 11.

When climbing solenoid valve 2 switched on alone, hydraulic oil gets into right side piston chamber 7 of climbing the hydro-cylinder 6 through second oil duct 5 through climbing solenoid valve 2, promotes piston 11 and moves left to climbing 6 left ends limiting position of hydro-cylinder, drives piston shaft 9 and shift fork 10 action left, accomplishes the action of putting into gear of climbing, climbs the fluid in the left side piston chamber 8 of hydro-cylinder 6 simultaneously and overflows to the gearbox oil tank along with corresponding first oil duct 4 under the extrusion of piston 11.

Example 2

The gear climbing electromagnetic valve 2 is connected with a right piston cavity 7 of the gear climbing oil cylinder 6 through a second oil duct 5, a spring is installed in a left piston cavity 8 of the gear climbing oil cylinder 6, and the gear climbing and the direct gear shifting are controlled by the aid of elasticity of the spring and the gear climbing electromagnetic valve 2.

When the gear shifting is needed, the gear shifting electromagnetic valve 2 is electrified, hydraulic oil enters through the electromagnetic valve through the second oil duct 5, the piston 11 overcomes the resistance of a spring under the extrusion pushing of the oil, and moves leftwards to a limit position at the left end of the gear shifting oil cylinder 6 to drive the piston shaft 9 and the shifting fork 10 fixed on the piston shaft to move leftwards, so that the gear shifting action of the gear shifting is completed;

when direct gear shifting is required, power supply of the crawling gear electromagnetic valve 2 is stopped, the piston 11 moves rightwards under the action of the spring until the right end of the crawling gear oil cylinder 6 limits the position, the piston shaft 9 and the shifting fork 10 fixed on the piston shaft are driven to move rightwards together, and gear shifting work of the direct gear is completed.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.

Claims (8)

1. The utility model provides a hydraulic pressure proportional control tractor climbs fender gearshift, its characterized in that, including climbing fender hydro-cylinder (6), solenoid valve, oil duct and piston shaft (9), the solenoid valve with climb and be equipped with the oil duct between fender hydro-cylinder (6), on piston shaft (9) wear to establish climbing fender hydro-cylinder (6), piston shaft (9) one end is fixed with shift fork (10), and the cover is equipped with piston (11) on piston shaft (9), and there is step form arch piston shaft (9) middle part.

2. The climbing gearshift mechanism of hydraulic proportional control tractor according to claim 1, characterized in that one end of the solenoid valve is connected with a solenoid valve seat (3), and the solenoid valve is installed on the solenoid valve seat (3).

3. A hydraulic proportional control tractor upshift gear shift mechanism according to claim 2, characterized in that said solenoid valves include a direct gear solenoid valve (1) and a upshift solenoid valve (2).

4. The hydraulic proportional control tractor upshift gear shifting mechanism according to claim 1, characterized in that said oil passages comprise a first oil passage (4) and a second oil passage (5), said first oil passage (4) and said second oil passage (5) being respectively communicated with an upshift cylinder (6).

5. The hydraulic proportional control tractor gear-shifting mechanism according to claim 1, wherein a piston cavity is arranged inside the gear-shifting cylinder (6).

6. The hydraulic proportional control tractor gear-climbing shifting mechanism according to claim 1, characterized in that both sides of the gear-climbing cylinder (6) are provided with through holes.

7. The hydraulic proportional control tractor gear-climbing shifting mechanism according to claim 6, wherein sealing rings are arranged in through holes at two ends of the gear-climbing oil cylinder (6), and the sealing rings are sleeved on the piston shaft (9).

8. The climbing gearshift mechanism of hydraulic proportional control tractor according to claim 7, wherein the piston (11) is provided with a step surface, and the piston (11) is installed on both sides of the middle convex part of the piston shaft (9).

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