CN214296111U - Hydraulic steering system suitable for variable rotating speed and road roller thereof - Google Patents
Hydraulic steering system suitable for variable rotating speed and road roller thereof Download PDFInfo
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- CN214296111U CN214296111U CN202120235807.9U CN202120235807U CN214296111U CN 214296111 U CN214296111 U CN 214296111U CN 202120235807 U CN202120235807 U CN 202120235807U CN 214296111 U CN214296111 U CN 214296111U
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Abstract
The utility model discloses a hydraulic steering system suitable for variable rotating speed and a road roller thereof, which comprises an oil tank, a rotating speed control pump, a steering gear and a steering oil cylinder; the oil inlet of the rotating speed control pump is connected with the oil tank, the oil outlet of the rotating speed control pump is connected with the oil inlet of the steering gear, oil passing through the steering gear enters a group of steering cylinders, the steering cylinders work to drive the working device to achieve a steering function, and the oil return port of the steering gear is connected with the oil tank. The utility model discloses a hydraulic steering system, the operation power that turns to when low rotational speed and performance are equivalent with the high rotational speed, and is easy and simple to handle moreover, can be along with engine speed automatic switch-over, need not increase any electrified device. Compared with a system adopting a constant flow plunger pump, the system has obvious cost advantage.
Description
Technical Field
The utility model relates to a hydraulic steering system and road roller suitable for variable rotational speed belongs to hydraulic engineering machinery technical field.
Background
At present, the main elements of a hydraulic steering system used on a road roller generally comprise a gear pump, a steering gear and a group of steering cylinders. The steering device of each specification generally needs to work normally under the flow rate in a corresponding range, and if the flow rate is too small, the steering operation force is heavy and the steering action is slow; if the flow is too large, the redundant flow overflows under high pressure, so that the noise is high, and the energy loss of the system is also high. The gear pump matching in the system is generally matched according to the rated speed of the engine, and when the engine is at a low speed, the gear pump is heavy when the steering operation is performed because the output flow of the gear pump is too small. Although a constant flow plunger pump can solve the above problems, the cost is increased greatly.
Disclosure of Invention
To the problem that above-mentioned prior art exists, the utility model provides a hydraulic steering system suitable for variable rotational speed and road roller thereof.
In order to achieve the above object, the utility model discloses a hydraulic steering system suitable for variable rotational speed, including oil tank, rotational speed control pump, steering gear and steering cylinder;
the oil inlet of the rotating speed control pump is connected with the oil tank, the oil outlet of the rotating speed control pump is connected with the oil inlet of the steering gear, oil passing through the steering gear enters a group of steering cylinders, the steering cylinders work to drive the working device to achieve a steering function, and the oil return port of the steering gear is connected with the oil tank.
As an improvement, the rotating speed control pump is arranged at a power take-off of the engine.
As an improvement, the rotating speed control pump comprises a control pump, a damping hole, a hydraulic control reversing valve, a second gear pump and a first gear pump;
the control pump, the gear pump II and the gear pump rotate coaxially;
one end of the first gear pump is connected with the oil inlet, and the other end of the first gear pump is connected with the oil outlet;
one end of the second gear pump is connected with the oil inlet, the other end of the second gear pump is respectively connected with the hydraulic control reversing valve and the one-way valve, and the one-way valve is connected with the oil outlet;
one end of the control pump is connected with the oil inlet, the other end of the control pump is respectively connected with the damping hole and the hydraulic control reversing valve, the other ends of the damping hole and the hydraulic control reversing valve are connected with the oil inlet, and the damping hole is connected with the hydraulic control reversing valve in parallel.
In addition, the utility model also provides a road roller, install on the road roller hydraulic steering system.
Compared with the prior art, the utility model discloses a hydraulic steering system, the steering operation power and the performance when low rotational speed are equivalent when with high rotational speed, and is easy and simple to handle moreover, can be along with engine speed automatic switch-over, need not increase any live device. Compared with a system adopting a constant flow plunger pump, the system has obvious cost advantage.
Drawings
FIG. 1 is a hydraulic schematic diagram of the present invention;
in the figure: 1. the hydraulic control steering system comprises an oil tank, 2, a rotating speed control pump, 3, a steering gear, 4, a steering oil cylinder, 5, a damping hole, 6, a hydraulic control reversing valve, 7, a one-way valve, 8, a control pump, 9, a second gear pump, 10 and a first gear pump.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below. It should be understood, however, that the description herein of specific embodiments is only intended to illustrate the invention and not to limit the scope of the invention.
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 invention belongs, and the terms used herein in the specification of the present invention are for the purpose of describing particular embodiments only and are not intended to limit the present invention.
As shown in fig. 1, a hydraulic steering system suitable for variable rotation speed comprises an oil tank 1, a rotation speed control pump 2, a steering gear 3 and a steering oil cylinder 4;
an oil inlet S of the rotating speed control pump 2 is connected with the oil tank 1, an oil outlet A of the rotating speed control pump 2 is connected with an oil inlet P of the steering gear 3, oil passing through the steering gear 3 enters the group of steering cylinders 4, the steering cylinders 4 work to drive the working device to realize a steering function, and an oil return port T of the steering gear 3 is connected with the oil tank 1.
As a modification of the embodiment, the revolution speed control pump 2 is installed at the engine power take-off.
As a modification of the embodiment, the rotation speed control pump 2 comprises a control pump 8, a damping hole 5, a hydraulic control reversing valve 6, a second gear pump 9 and a first gear pump 10;
the control pump 8, the gear pump II 9 and the gear pump I10 coaxially rotate; one end of the first gear pump 10 is connected with the oil inlet S, and the other end of the first gear pump is connected with the oil outlet A; one end of the second gear pump 9 is connected with the oil inlet S, the other end of the second gear pump is respectively connected with the hydraulic control reversing valve 6 and the one-way valve 7, and the one-way valve 7 is connected with the oil outlet A; one end of the control pump 8 is connected with the oil inlet S, the other end of the control pump is respectively connected with the damping hole 5 and the hydraulic control reversing valve 6, the other ends of the damping hole 5 and the hydraulic control reversing valve 6 are connected with the oil inlet S, and the damping hole 5 is connected with the hydraulic control reversing valve 6 in parallel.
Finally, the utility model also provides a road roller, install on the road roller hydraulic steering system.
When the steering device is used, the rotating speed control pump 2 sucks oil from the oil tank 1, oil enters the oil inlet P of the steering gear 3 from the oil A port at the outlet of the rotating speed control pump 2, the oil enters the steering oil cylinders 4 through the reversing and metering functions of the steering gear 3, the steering oil cylinders 4 work to drive the working device to realize the steering function, and return oil of the steering gear 3 flows back to the oil tank 1 through the T port.
When the engine is in a low rotating speed, the pressure built by the control pump 8 through the damping hole 5 is small and is not enough to overcome the reset spring force of the hydraulic control reversing valve 6, and at the moment, the gear pump II 9 and the gear pump I10 output flow together through the one-way valve 7 and enter the steering gear 3; when the rotating speed of the engine is continuously increased, the flow of the control pump 8 is increased, the pressure built by the hydraulic oil flowing through the damping hole 5 is also increased, when the pressure is enough to overcome the reset spring force of the hydraulic control reversing valve 6, the output flow of the second gear pump 9 directly flows back to the oil inlet S, and only the output flow of the first gear pump 10 enters the steering gear 3.
The utility model discloses a rotational speed control pump 2 can guarantee the output flow of certain limit according to the rotational speed change automatic switch-over pump's of engine mode. When the engine runs at a low speed, the flow output by the rotating speed control pump 2 can meet the normal work of the steering gear 3 as well as the flow output by the engine running at a high speed; when the engine runs at a high speed, the redundant flow output by the rotating speed control pump 2 can be unloaded at a low pressure, and energy loss can not be brought to the system.
From Q n V η, the two main parameters that determine the output flow of the pump are the input speed of the pump and the displacement of the pump, in the formula Q-the flow of the pump, n-the input speed of the pump, V-the displacement of the pump, η -the volumetric efficiency of the pump. Through the matching design of the rotating speed and the technical parameters of all elements in the system, the flow output from the rotating speed control pump 2 under different rotating speeds can be the same, so that the steering operation force and the steering performance are ensured.
The specific working process is as follows:
1) when the engine is in a low rotating speed, the pressure built by the control pump 8 through the damping hole 5 is small and is not enough to overcome the reset spring force of the hydraulic control reversing valve 6, the hydraulic control reversing valve 6 is in a left non-stop position, and at the moment, oil output by the second gear pump 9 and oil output by the first gear pump 10 enter the steering gear 3 together through the one-way valve 7. The steering gear 3 is operated by a steering wheel, and when the steering wheel is steered to the left, pressure oil flows out of an L port of the steering gear 3 to the steering oil cylinder 4 to drive the working device to realize left steering; when a steering wheel is steered to the right, pressure oil flows out of an R port of the steering gear 3 to the steering oil cylinder 4 to drive the working device to realize right steering;
2) when the pressure is enough to overcome the reset spring force of the hydraulic control reversing valve 6, the hydraulic control reversing valve 6 is in the right side communicating position, the oil output by the second gear pump 9 directly flows back to the oil inlet S through the hydraulic control reversing valve 6, and only the oil output by the first gear pump 10 enters the steering gear 3. The steering gear 3 is operated by a steering wheel, and when the steering wheel is steered to the left, pressure oil flows out of an L port of the steering gear 3 to the steering oil cylinder 4 to drive the working device to realize left steering; when a steering wheel is steered to the right, pressure oil flows out of an R port of the steering gear 3 to the steering oil cylinder 4 to drive the working device to realize right steering.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the present invention.
Claims (4)
1. A hydraulic steering system suitable for variable rotating speed is characterized by comprising an oil tank (1), a rotating speed control pump (2), a steering gear (3) and a steering oil cylinder (4);
an oil inlet of the rotating speed control pump (2) is connected with the oil tank (1), an oil outlet of the rotating speed control pump (2) is connected with an oil inlet of the steering gear (3), oil passing through the steering gear (3) enters the steering oil cylinders (4), the steering oil cylinders (4) work to drive the working device to achieve a steering function, and an oil return port of the steering gear (3) is connected with the oil tank (1).
2. A hydraulic steering system adapted for variable speed according to claim 1, wherein the speed control pump (2) is mounted at the engine power take-off.
3. A hydraulic steering system adapted to variable rotation speed according to claim 1 or 2, wherein the rotation speed control pump (2) comprises a control pump (8), a damping hole (5), a pilot operated directional control valve (6), a gear pump two (9) and a gear pump one (10);
the control pump (8), the gear pump II (9) and the gear pump I (10) coaxially rotate;
one end of the first gear pump (10) is connected with the oil inlet, and the other end of the first gear pump is connected with the oil outlet;
one end of the second gear pump (9) is connected with the oil inlet, the other end of the second gear pump is respectively connected with the hydraulic control reversing valve (6) and the one-way valve (7), and the one-way valve (7) is connected with the oil outlet;
one end of the control pump (8) is connected with the oil inlet, the other end of the control pump is connected with the damping hole (5) and the hydraulic control reversing valve (6), the other ends of the damping hole (5) and the hydraulic control reversing valve (6) are connected with the oil inlet, and the damping hole (5) is connected with the hydraulic control reversing valve (6) in parallel.
4. A roller having a hydraulic steering system as claimed in any one of claims 1 to 3 mounted thereon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120235807.9U CN214296111U (en) | 2021-01-28 | 2021-01-28 | Hydraulic steering system suitable for variable rotating speed and road roller thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120235807.9U CN214296111U (en) | 2021-01-28 | 2021-01-28 | Hydraulic steering system suitable for variable rotating speed and road roller thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214296111U true CN214296111U (en) | 2021-09-28 |
Family
ID=77830905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120235807.9U Active CN214296111U (en) | 2021-01-28 | 2021-01-28 | Hydraulic steering system suitable for variable rotating speed and road roller thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214296111U (en) |
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2021
- 2021-01-28 CN CN202120235807.9U patent/CN214296111U/en active Active
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