CN219119545U - Fixed difference pressure reducing device for hydraulic motor - Google Patents
Fixed difference pressure reducing device for hydraulic motor Download PDFInfo
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- CN219119545U CN219119545U CN202223211013.2U CN202223211013U CN219119545U CN 219119545 U CN219119545 U CN 219119545U CN 202223211013 U CN202223211013 U CN 202223211013U CN 219119545 U CN219119545 U CN 219119545U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The application belongs to the technical field of electromechanics and hydraulic pressure, and particularly relates to a constant difference pressure reducing device for a hydraulic motor. Comprising the following steps: an oil inlet pipeline, a variable motor 2, a centrifugal regulator 3, an oil outlet pipeline and a constant difference pressure reducing valve 4. The constant difference pressure reducing device for the hydraulic motor combines the oil return path with the oil outlet path, and cancels the independent oil return path on the hydraulic system, thereby achieving the purposes of optimizing the system pipeline and reducing the weight. The fixed differential pressure reducing valve is arranged between the oil outlet and the oil return port of the shell, so that the fixed differential pressure exists between the oil return port and the oil outlet of the motor shell, the hydraulic flow field in the motor shell is in a stable state, the centrifugal regulator is not influenced by the pulsating pressure oil of the outlet any more, and the purpose of controlling the speed of the hydraulic motor is realized.
Description
Technical Field
The application belongs to the technical field of electromechanics and hydraulic pressure, and particularly relates to a constant difference pressure reducing device for a hydraulic motor.
Background
The hydraulic motor is an energy conversion device for converting hydraulic energy into mechanical energy, the output quantity is shaft rotation speed and torque, the torque is determined by inlet-outlet pressure difference, and the rotation speed is determined by the displacement or flow of the hydraulic motor. The hydraulic motor is structurally provided with an oil inlet, an oil outlet and a shell oil return port, the individual hydraulic motor is also provided with a shaft tail oil drain port, the shell oil return port is responsible for draining oil which leaks to the inner cavity of the shell through a sealing part, certain solid pollutants exist in the oil to be filtered, heat generated in the operation process of the hydraulic motor can be taken away, the characteristic of shell oil return is effectively utilized to clean and dissipate heat of the hydraulic motor, and the hydraulic motor is beneficial to the improvement of functions and performance of the motor and the prolongation of service life.
It is generally necessary to use a separate oil line to drain this oil back to the system tank, which presents a difficulty in the installation of the motor equipment assembly and the oil line, and it is not necessary to provide a separate oil line if the motor housing is returned to the oil outlet within the product. The combination of the oil return path and the oil outlet path eliminates an independent oil return path on a hydraulic system, but for a variable displacement motor which realizes speed regulation by means of a built-in centrifugal regulator, oil with certain pulsation pressure at an oil outlet enters a cavity of a shell and acts on a motor swash plate control piston to influence the motor rotating speed, and uncontrollable rotating speed and equipment damage can be caused when serious.
It is therefore desirable to have a solution that overcomes or at least alleviates at least one of the above-mentioned drawbacks of the prior art.
Disclosure of Invention
It is an object of the present application to provide a constant difference pressure reducing device for a hydraulic motor to solve at least one problem of the prior art.
The technical scheme of the application is as follows:
a constant differential pressure relief device for a hydraulic motor, comprising:
the oil inlet pipeline comprises an oil inlet total pipeline, a first oil inlet pipeline and a second oil inlet pipeline, the second end of the oil inlet total pipeline is respectively connected with the first end of the first oil inlet pipeline and the first end of the second oil inlet pipeline, and an electromagnetic control valve is arranged on the oil inlet total pipeline;
the variable motor is provided with an oil dividing port, an oil outlet and a shell oil return port, and the oil dividing port is connected with the second end of the first oil inlet pipeline;
the centrifugal regulator comprises a centrifugal block, a regulating valve and a piston cylinder, wherein the centrifugal block is arranged on an output shaft of the variable motor, the regulating valve is arranged on the second oil inlet branch pipeline and is connected with a lever of the centrifugal block, a first end of the piston cylinder is connected with a second end of the second oil inlet pipeline, and a second end of the piston cylinder is connected with a sloping cam plate of the variable motor;
the oil outlet pipeline comprises an oil outlet main pipeline, a first oil outlet pipeline and a second oil outlet pipeline, wherein the first end of the first oil outlet pipeline is connected with an oil outlet of the variable motor, the first end of the second oil outlet pipeline is connected with an oil return port of a shell of the variable motor, and the first end of the oil outlet main pipeline is respectively connected with the second end of the first oil outlet pipeline and the second end of the second oil outlet pipeline;
the fixed difference pressure reducing valve is arranged on the first oil outlet branch pipeline.
In at least one embodiment of the present application, the first end of the oil feed main is connected to a hydraulic system.
In at least one embodiment of the present application, the solenoid control valve is connected to a 28V dc power supply.
In at least one embodiment of the present application, the second end of the main oil outlet pipe is connected to a hydraulic system tank.
The utility model has at least the following beneficial technical effects:
the utility model provides a decide poor pressure relief device for hydraulic motor has merged oil return path and oil outlet path, has realized system's pipeline optimization and has subtracted heavy to set up the poor relief valve surely between casing oil return opening and oil-out, make motor casing oil return path and oil outlet path have fixed pressure differential, the inside hydraulic flow field of motor casing is in steady state, guarantees that centrifugal regulator is no longer influenced by export pulsation pressure fluid.
Drawings
Fig. 1 is a schematic diagram of a differential pressure relief device for a hydraulic motor according to one embodiment of the present application.
Wherein:
1-an electromagnetic control valve; 2-variable motor; 3-centrifugal regulator; 31-centrifuging the block; 32-a regulating valve; 33-piston cylinder; 4-constant difference pressure reducing valve.
Detailed Description
In order to make the purposes, technical solutions and advantages of the implementation of the present application more clear, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present application. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. Embodiments of the present application are described in detail below with reference to the accompanying drawings.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of the present application.
The present application is described in further detail below in conjunction with fig. 1.
The application provides a differential pressure relief device for hydraulic motor, include: an oil inlet pipeline, a variable motor 2, a centrifugal regulator 3, an oil outlet pipeline and a constant difference pressure reducing valve 4.
Specifically, as shown in fig. 1, the oil inlet pipeline comprises an oil inlet main pipeline, a first oil inlet pipeline and a second oil inlet pipeline, a first end of the oil inlet main pipeline is connected with the hydraulic system, oil of the hydraulic system enters the constant difference pressure reducing device through the oil inlet main pipeline, a second end of the oil inlet main pipeline is connected with the first end of the first oil inlet pipeline and the first end of the second oil inlet pipeline respectively, an electromagnetic control valve 1 is arranged on the oil inlet main pipeline, and the electromagnetic control valve 1 is powered by a 28V direct current power supply.
The variable motor 2 is provided with an oil dividing port, an oil outlet and a shell oil return port, wherein the oil dividing port is connected with the second end of the first oil inlet pipeline, and hydraulic oil enters the variable motor from the oil dividing port under the action of inlet oil pressure.
The centrifugal regulator 3 comprises a centrifugal block 31, a regulating valve 32 and a piston cylinder 33, wherein the centrifugal block 31 is arranged on an output shaft of the variable motor 2, the regulating valve 32 is arranged on a second oil inlet branch pipeline, the regulating valve 32 is connected with a lever of the centrifugal block 31, a first end of the piston cylinder 33 is connected with a second end of the second oil inlet pipeline, and a second end of the piston cylinder 33 is connected with a swash plate of the variable motor 2.
The oil outlet pipeline comprises an oil outlet main pipeline, a first oil outlet pipeline and a second oil outlet pipeline, wherein the first end of the first oil outlet pipeline is connected with an oil outlet of the variable motor, the first end of the second oil outlet pipeline is connected with an oil return port of a shell of the variable motor 2, the first end of the oil outlet main pipeline is respectively connected with the second end of the first oil outlet pipeline and the second end of the second oil outlet pipeline, and the second end of the oil outlet main pipeline is connected with a hydraulic system oil tank; in addition, the constant difference reducing valve 4 is provided on the first oil outlet branch line.
According to the constant difference pressure reducing device for the hydraulic motor, hydraulic oil enters a high-pressure oil dividing port of the variable motor 2 through a first oil inlet branch pipeline under the action of inlet oil pressure, and enters a control window of the regulating valve 32 through a second oil inlet branch pipeline. Under the action of high-pressure oil, the rotation speed of the output shaft of the variable motor 2 is continuously increased, and the two centrifugal blocks 31 connected to the output shaft are driven to rotate in a flyweight manner. Before the rated rotational speed is reached, the centrifugal force of the centrifugal block 31 is insufficient to overcome the preset elastic force of the adjusting spring of the adjusting valve 32, the control spool of the adjusting valve 32 is in a state of communicating the oil chamber of the piston cylinder 33 with the housing chamber, and the variable displacement motor 2 is operated in a maximum displacement state, in which the variable displacement motor 2 has a maximum starting moment and a maximum starting flow rate. When the rotating speed of the variable motor 2 reaches and exceeds the rated value, the centrifugal force generated by centrifugal flyweights can overcome the spring force, the lever of the centrifugal block 31 moves the regulating valve 32 to control the valve core to be in a state that the piston control cavity is communicated with hydraulic oil, the variable piston cylinder 33 overcomes the elastic force of the return spring of the swash plate to reduce the motor displacement under the action of the hydraulic oil, the required flow of the motor is rapidly reduced, and the rotating speed of the motor rotor is reduced under the action of the resistance moment. The swash plate inclination angle of the variable displacement motor 2 continues to decrease until the rotational speed of the decrease makes the centrifugal force generated by the centrifugal block 31 equal to the adjustment spring preset value of the adjustment valve 32, so that the oil chamber of the slave piston and the housing chamber and the valve port of the second oil feed line are both shut off (neutral position).
During the working process of the variable motor 2, hydraulic oil leaks to the shell cavity through the motor sliding shoe, and oil accumulated in the shell cavity is combined with oil at the motor outlet through the oil return pipeline and flows to the oil tank of the hydraulic system. In the working process of the variable displacement motor 2, before the rated rotation speed is reached, the centrifugal force of the centrifugal block 31 is insufficient to overcome the preset elasticity of the adjusting spring of the adjusting valve 32, the control valve core is in a state of enabling the oil cavity of the piston cylinder 33 to be communicated with the shell cavity, the pressure of the shell cavity directly acts on the motor swash plate control piston, if the pressure of the shell cavity has large pressure fluctuation, the control piston overcomes the elasticity of the return spring under the action of hydraulic oil, the motor displacement is reduced, and the rotation speed is reduced, so that the motor rotation speed is influenced. According to the variable motor oil pressure control device, the fixed difference pressure reducing valve 4 is added on the first oil outlet branch pipeline connected with the outlet oil of the variable motor 2, the second oil outlet branch pipeline for oil return of the shell is connected to the fixed difference pressure reducing valve 4, the pressure of outlet oil becomes stable after passing through the fixed difference pressure reducing valve 4, and the elastic force of the return spring is not abnormally overcome under the action of stable shell oil pressure of the control piston, so that the motor rotating speed is not influenced.
The constant difference pressure reducing device for the hydraulic motor combines the oil return path with the oil outlet path, and cancels the independent oil return path on the hydraulic system, thereby achieving the purposes of optimizing the system pipeline and reducing the weight. The fixed differential pressure reducing valve is arranged between the oil outlet and the oil return port of the shell, so that the fixed differential pressure exists between the oil return port and the oil outlet of the motor shell, the hydraulic flow field in the motor shell is in a stable state, the centrifugal regulator is not influenced by the pulsating pressure oil of the outlet any more, and the purpose of controlling the speed of the hydraulic motor is realized. It will be appreciated that each of the elements described above are conventional devices in the art and that the present application is not directed to improvements in the internal construction of each element.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (4)
1. A constant differential pressure reducing device for a hydraulic motor, comprising:
the oil inlet pipeline comprises an oil inlet main pipeline, a first oil inlet pipeline and a second oil inlet pipeline, the second end of the oil inlet main pipeline is respectively connected with the first end of the first oil inlet pipeline and the first end of the second oil inlet pipeline, and an electromagnetic control valve (1) is arranged on the oil inlet main pipeline;
the variable motor (2) is provided with an oil dividing port, an oil outlet and a shell oil return port, and the oil dividing port is connected with the second end of the first oil inlet pipeline;
the centrifugal regulator (3), the centrifugal regulator (3) comprises a centrifugal block (31), a regulating valve (32) and a piston cylinder (33), the centrifugal block (31) is installed on the output shaft of the variable motor (2), the regulating valve (32) is arranged on the second oil inlet branch pipeline, the regulating valve (32) is connected with a lever of the centrifugal block (31), a first end of the piston cylinder (33) is connected with a second end of the second oil inlet branch pipeline, and a second end of the piston cylinder (33) is connected with a swash plate of the variable motor (2);
the oil outlet pipeline comprises an oil outlet main pipeline, a first oil outlet pipeline and a second oil outlet pipeline, wherein the first end of the first oil outlet pipeline is connected with an oil outlet of the variable motor, the first end of the second oil outlet pipeline is connected with an oil return port of a shell of the variable motor (2), and the first end of the oil outlet main pipeline is respectively connected with the second end of the first oil outlet pipeline and the second end of the second oil outlet pipeline;
the fixed difference pressure reducing valve (4) is arranged on the first oil outlet branch pipeline.
2. The constant differential pressure relief device for a hydraulic motor according to claim 1, wherein a first end of said main oil feed line is connected to a hydraulic system.
3. The constant difference pressure reducing device for a hydraulic motor according to claim 1, wherein the electromagnetic control valve (1) is connected with a 28V dc power supply.
4. The constant difference pressure reducing device for a hydraulic motor according to claim 1, wherein the second end of the oil outlet main pipe is connected to a hydraulic system oil tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223211013.2U CN219119545U (en) | 2022-12-01 | 2022-12-01 | Fixed difference pressure reducing device for hydraulic motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223211013.2U CN219119545U (en) | 2022-12-01 | 2022-12-01 | Fixed difference pressure reducing device for hydraulic motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219119545U true CN219119545U (en) | 2023-06-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223211013.2U Active CN219119545U (en) | 2022-12-01 | 2022-12-01 | Fixed difference pressure reducing device for hydraulic motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219119545U (en) |
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2022
- 2022-12-01 CN CN202223211013.2U patent/CN219119545U/en active Active
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