CN211969399U - Control device for preventing brake variable pump from being cut off when stepping on four-wheel drive state - Google Patents
Control device for preventing brake variable pump from being cut off when stepping on four-wheel drive state Download PDFInfo
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- CN211969399U CN211969399U CN202020204215.6U CN202020204215U CN211969399U CN 211969399 U CN211969399 U CN 211969399U CN 202020204215 U CN202020204215 U CN 202020204215U CN 211969399 U CN211969399 U CN 211969399U
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Abstract
The utility model relates to a control device which is not cut off when a brake variable pump is stepped on in a four-wheel drive state, comprising a brake solenoid valve, a four-wheel drive start button, a first intermediate relay, a second intermediate relay, a first intermediate relay normally open contact, a solenoid valve for switching, a second intermediate relay normally closed contact, a brake switch and a brake solenoid valve coil; two oil inlets and outlets of the brake electromagnetic valve are respectively connected with two connecting pipelines which are connected with the servo control valve and the servo control cylinder of the variable displacement pump through pipelines; the four-wheel drive starting button is respectively connected with the first intermediate relay and the second intermediate relay in series and then connected with the power supply in series to form a four-wheel drive trigger control circuit; a normally open contact of a first intermediate relay, a switching electromagnetic valve and a power supply are connected in series to form a four-wheel drive starting control loop; the normally closed contact of the second intermediate relay, the brake switch, the brake solenoid valve coil and the power supply are connected in series to form a brake uninterrupted pump control loop. The device has solved when the front wheel skidded, the problem that the operation car drove from the district that sinks.
Description
Technical Field
The utility model belongs to the technical field of agricultural machine, a agricultural machine four wheel drive traveling system is related to, concretely relates to step on controlling means that brake variable pump does not cut off under the four wheel drive state.
Background
Four-wheel drive of the farmland operation machine is a necessary condition for realizing all-weather operation. The existing four-wheel drive is divided into mechanical four-wheel drive and hydraulic four-wheel drive. The mechanical four-wheel drive is disfavored by users due to the defects of poor synchronism of front and rear wheels, poor matching of tires, slipping of a clutch, high failure rate and the like. The hydraulic four-wheel drive is popular among users due to the advantages of good synchronism, good tire matching, convenient operation, low failure rate and the like. However, the existing hydraulic four-wheel drive adopts high-cost hydraulic elements such as a variable pump, a variable motor and the like, so that the use cost is increased, and the hydraulic four-wheel drive is difficult to be accepted by common use groups.
Aiming at the defects of the existing hydraulic four-wheel drive mode, a full-liquid four-wheel drive system with convenient two-wheel drive and four-wheel drive switching, low use cost and good reliability is designed in advance, referring to fig. 1, the overall design idea of the four-wheel drive system is as follows: comprises a variable displacement pump, a front fixed displacement motor 1, a switching electromagnetic valve 4, a left rear fixed displacement motor 6 and a right rear fixed displacement motor 5. A first working oil port of the variable pump is connected with a first working oil port of the front fixed-quantity motor and a first working oil port of the switching electromagnetic valve through a dry-sub combined pipeline, and a second working oil port of the variable pump is connected with a second working oil port of the front fixed-quantity motor and a fourth working oil port of the switching electromagnetic valve through a dry-sub combined pipeline; the second working oil port of the switching electromagnetic valve is connected with the first working oil port of the left rear quantitative motor and the second working oil port of the right rear quantitative motor through the dry branch combined pipeline, and the third working oil port of the switching electromagnetic valve is connected with the second working oil port of the left rear quantitative motor and the first working oil port of the right rear quantitative motor through the dry branch combined pipeline. The switching solenoid valve acts on a solenoid valve coil through a control loop to drive the solenoid valve core, a first oil port of the switching solenoid valve corresponds to a second oil port, a third oil port of the switching solenoid valve corresponds to a fourth oil port of the switching solenoid valve and is simultaneously communicated or closed, and the four-wheel drive and two-wheel drive state switching is completed. The variable pump is of an integrated structure and mainly comprises a variable pump main body 3, a servo control valve 2 and a variable pump servo control cylinder 7, two oil inlets and two oil outlets of the servo control valve are respectively and correspondingly connected with two oil inlets and two oil outlets of the variable pump servo control cylinder through internal pipelines, and the variable pump servo control cylinder is used for controlling the angle of a swash plate of the variable pump to realize the adjustment of the displacement.
In the above-mentioned pre-designed all-liquid four-wheel drive system, when controlling the variable displacement pump, the actual conditions to be considered are as follows: the four-wheel drive of the harvesting machine is mainly applied to field operation, the front wheels slip due to sinking of the front wheels during operation on muddy lands, and the vehicle is poured out and driven away from a sunk area by taking measures to avoid vehicle sinking. For the full hydraulic drive four-wheel drive, because of the particularity of the hydraulic drive, under the condition that the front wheel slips, the flow can flow to the front wheel motor, the flow distribution of the rear wheel motor is less, and meanwhile, because the adhesion force between the front wheel slipped and the ground is small, the system pressure is difficult to build, the pressure is lower, and the driving torque and the driving power of the front wheel and the rear wheel cannot be exerted. Therefore, for full hydraulic four-wheel drive, under the condition that the front wheels slip, how to distribute the flow of the front and rear wheel motors and improve the system pressure is the key of the problem.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's weak point, provide a step on the controlling means that brake variable pump does not cut off under the four wheel drive state, adopt this controlling means, when the tire skids before taking place, under the four-wheel drive mode, add through stepping on the brake and hinder the front wheel, can improve the adhesive force on front tire and ground, improve hydraulic system pressure to solve the operation car and drive from the problem of the district that caves in.
The above object of the present invention is achieved by the following technical solutions:
a control device for preventing a variable pump from being cut off when a brake is stepped on in a four-wheel drive state is characterized in that: the brake system comprises a brake solenoid valve, a four-wheel drive starting button, a first intermediate relay, a second intermediate relay, a first intermediate relay normally-open contact, a switching solenoid valve coil, a second intermediate relay normally-closed contact, a brake switch and a brake solenoid valve coil;
two oil inlets and outlets of the brake electromagnetic valve are respectively connected with two connecting pipelines which are connected with the servo control valve and the servo control cylinder of the variable displacement pump through pipelines;
the four-wheel drive starting button is respectively connected with the first intermediate relay and the second intermediate relay in series and then connected with the power supply in series to form a four-wheel drive trigger control circuit; the normally open contact of the first intermediate relay, the switching electromagnetic valve coil and the power supply are sequentially connected in series to form a four-wheel drive starting control loop; the second intermediate relay normally-closed contact, the brake switch, the brake solenoid valve coil and the power supply are sequentially connected in series to form a brake uninterrupted pump control loop; the three control loop power supplies are shared.
Further: the brake electromagnetic valve adopts a two-position two-way electromagnetic valve.
Further: the brake switch adopts a normally open type pressure self-reset switch.
The above object of the present invention can also be achieved by the following technical solutions:
a control device for preventing a variable pump from being cut off when a brake is stepped on in a four-wheel drive state is characterized in that: the brake system comprises a brake solenoid valve, a four-wheel drive starting button, an intermediate relay normally-open contact, a switching solenoid valve coil, an intermediate relay normally-closed contact, a brake switch and a brake solenoid valve coil;
two oil inlets and outlets of the brake electromagnetic valve are respectively connected with two connecting pipelines which are connected with the servo control valve and the servo control cylinder of the variable displacement pump through pipelines;
the four-wheel drive starting button, the intermediate relay and the power supply are connected in series to form a four-wheel drive trigger control loop; the normally open contact of the intermediate relay, the switching solenoid valve coil and the power supply are sequentially connected in series to form a four-wheel drive starting control loop; the normally closed contact of the intermediate relay, the brake switch, the brake solenoid valve coil and the power supply are sequentially connected in series to form a brake uninterrupted pump control loop; the three control loop power supplies are shared.
The utility model has the advantages and positive effect:
the utility model adds a second intermediate relay in the four-wheel drive trigger control loop, and connects the normally closed contact of the second intermediate relay, the brake switch, the brake electromagnetic valve coil with the power supply in series to form a brake continuous pump control loop, or under the condition of using an intermediate relay, connects the normally closed contact of the intermediate relay, the brake switch, the brake electromagnetic valve coil with the power supply in series to form a brake continuous pump control loop, thus, when four-wheel drive is realized, the variable pump of stepping on the brake is not cut off, the hydraulic system still works, the front wheel is blocked by stepping on the brake, the adhesive force of the front tire and the ground is improved, the pressure of the hydraulic system is improved, thereby under the condition of almost not increasing the cost, the extreme condition that the front tire skids appears, the extreme condition that the front tire can be changed by stepping on the brake, the low-speed gear position, the displacement of the variable pump is changed, and the like, the normal driving separation and trapping area of the four-wheel drive vehicle is realized.
Drawings
Fig. 1 is a hydraulic control connection schematic diagram of a four-wheel drive system according to the present invention;
fig. 2 is an electric control schematic diagram of a first embodiment of the present invention;
fig. 3 is an electrical control schematic diagram of a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments, which are illustrative, not restrictive, and the scope of the invention should not be limited thereto.
The first embodiment is as follows:
referring to fig. 1-2, a control device for preventing a brake variable pump from being cut off when a brake is stepped on in a four-wheel drive state includes a brake solenoid valve 9, a four-wheel drive start button 10, a first intermediate relay 11, a second intermediate relay 12, a first intermediate relay normally open contact 16, a switching solenoid valve coil 13, a second intermediate relay normally closed contact 15, a brake switch 14, and a brake solenoid valve coil 8.
Two liquid inlet and outlet ports of the brake electromagnetic valve are respectively connected with two connecting pipelines of the servo control valve and the variable pump servo control cylinder through pipelines; therefore, after the brake electromagnetic valve is electrically communicated, the two oil inlets and the oil outlets of the variable pump servo control cylinder form a short circuit, so that the variable pump servo control cylinder retracts due to no pressure difference, the swash plate of the variable pump returns to the middle position, the displacement is zero, and the brake state is realized.
The four-wheel drive starting button is respectively connected with the first intermediate relay and the second intermediate relay in series and then connected with the power supply in series to form a four-wheel drive trigger control circuit; the normally open contact of the first intermediate relay, the switching electromagnetic valve coil and the power supply are sequentially connected in series to form a four-wheel drive starting control loop; the second intermediate relay normally-closed contact, the brake switch, the brake solenoid valve coil and the power supply are sequentially connected in series to form a brake uninterrupted pump control loop; the three control loop power supplies are shared.
In the above control device, the brake solenoid valve is a two-position two-way solenoid valve.
In the control device, the brake switch is a normally-open pressure self-reset switch.
The principle of the control device is as follows:
in the two-drive mode, the four-drive starting button is not pressed down, the two intermediate relays are not electrified, and the normally closed contact of the second intermediate relay is closed. If the brake is stepped on, the brake switch is closed, the coil of the brake electromagnetic valve is electrified, the brake electromagnetic valve is conducted, the variable pump servo control cylinder returns to the center, the swash plate of the variable pump is driven to return to the center, the variable displacement variable of the variable pump is zero, the motor stops, and the whole vehicle brakes.
In the four-wheel drive mode, when the four-wheel drive starting button is pressed down, the two intermediate relays are electrified, and the normally closed contact of the second intermediate relay is disconnected. If the brake is stepped on, although the brake switch is closed, the coil of the brake electromagnetic valve is not electrified, and the brake electromagnetic valve is still closed after being not actuated. The servo control cylinder of the variable pump does not retract, the swash plate of the variable pump does not return to the middle, the displacement variable of the variable pump does not return to zero, and the motor does not stop. In this case, the brake is applied by mechanically braking the transmission with the master cylinder and the slave cylinder, and the braking force is a resistance to the driving force of the hydraulic system.
The brake resistance of the brake force to the brake chuck of the transmission contributes to the build-up of hydraulic system pressure in the event that the front wheels slip and the adhesion of the front wheels to the ground is very low.
Example two:
referring to fig. 1 and 3, the difference between the present embodiment and the first embodiment is: only one intermediate relay 17 is arranged, and a normally open contact 19, a switching solenoid valve coil and a power supply of the intermediate relay are sequentially connected in series to form a four-wheel drive starting control loop; the normally closed contact 18, the brake switch, the brake solenoid valve coil and the power supply of the intermediate relay are connected in series in sequence to form a brake uninterrupted pump control loop. Other features are the same as in the first embodiment.
Compared with the first embodiment, the first embodiment has the advantages that fewer components are adopted, the structure is simplified, and the control is simpler. The working principle of this embodiment refers to the first embodiment, and is not described herein again
Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims, and therefore, the scope of the present invention is not limited to the disclosure of the embodiments and the accompanying drawings.
Claims (4)
1. A control device for preventing a variable pump from being cut off when a brake is stepped on in a four-wheel drive state is characterized in that: the brake system comprises a brake solenoid valve, a four-wheel drive starting button, a first intermediate relay, a second intermediate relay, a first intermediate relay normally-open contact, a switching solenoid valve coil, a second intermediate relay normally-closed contact, a brake switch and a brake solenoid valve coil;
two oil inlets and outlets of the brake electromagnetic valve are respectively connected with two connecting pipelines which are connected with the servo control valve and the servo control cylinder of the variable displacement pump through pipelines;
the four-wheel drive starting button is respectively connected with the first intermediate relay and the second intermediate relay in series and then connected with the power supply in series to form a four-wheel drive trigger control circuit; the normally open contact of the first intermediate relay, the switching electromagnetic valve coil and the power supply are sequentially connected in series to form a four-wheel drive starting control loop; the second intermediate relay normally-closed contact, the brake switch, the brake solenoid valve coil and the power supply are sequentially connected in series to form a brake uninterrupted pump control loop; the three control loop power supplies are shared.
2. The control device for non-cutoff of a variable pump when a brake is applied in a four-wheel drive state according to claim 1, wherein: the brake electromagnetic valve adopts a two-position two-way electromagnetic valve.
3. The control device for non-cutoff of a variable pump when a brake is applied in a four-wheel drive state according to claim 1, wherein: the brake switch adopts a normally open type pressure self-reset switch.
4. A control device for preventing a variable pump from being cut off when a brake is stepped on in a four-wheel drive state is characterized in that: the brake system comprises a brake solenoid valve, a four-wheel drive starting button, an intermediate relay normally-open contact, a switching solenoid valve coil, an intermediate relay normally-closed contact, a brake switch and a brake solenoid valve coil;
two oil inlets and outlets of the brake electromagnetic valve are respectively connected with two connecting pipelines which are connected with the servo control valve and the servo control cylinder of the variable displacement pump through pipelines;
the four-wheel drive starting button, the intermediate relay and the power supply are connected in series to form a four-wheel drive trigger control loop; the normally open contact of the intermediate relay, the switching solenoid valve coil and the power supply are sequentially connected in series to form a four-wheel drive starting control loop; the normally closed contact of the intermediate relay, the brake switch, the brake solenoid valve coil and the power supply are sequentially connected in series to form a brake uninterrupted pump control loop; the three control loop power supplies are shared.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020204215.6U CN211969399U (en) | 2020-02-25 | 2020-02-25 | Control device for preventing brake variable pump from being cut off when stepping on four-wheel drive state |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020204215.6U CN211969399U (en) | 2020-02-25 | 2020-02-25 | Control device for preventing brake variable pump from being cut off when stepping on four-wheel drive state |
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| Publication Number | Publication Date |
|---|---|
| CN211969399U true CN211969399U (en) | 2020-11-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020204215.6U Active CN211969399U (en) | 2020-02-25 | 2020-02-25 | Control device for preventing brake variable pump from being cut off when stepping on four-wheel drive state |
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| Country | Link |
|---|---|
| CN (1) | CN211969399U (en) |
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2020
- 2020-02-25 CN CN202020204215.6U patent/CN211969399U/en active Active
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