KR20120081721A - Hydraulic driving system - Google Patents

Hydraulic driving system Download PDF

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Publication number
KR20120081721A
KR20120081721A KR1020110002993A KR20110002993A KR20120081721A KR 20120081721 A KR20120081721 A KR 20120081721A KR 1020110002993 A KR1020110002993 A KR 1020110002993A KR 20110002993 A KR20110002993 A KR 20110002993A KR 20120081721 A KR20120081721 A KR 20120081721A
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KR
South Korea
Prior art keywords
hydraulic
pump
motor
drive
driven
Prior art date
Application number
KR1020110002993A
Other languages
Korean (ko)
Inventor
엄현식
Original Assignee
엄현식
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엄현식 filed Critical 엄현식
Priority to KR1020110002993A priority Critical patent/KR20120081721A/en
Publication of KR20120081721A publication Critical patent/KR20120081721A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/027—Check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/04—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by varying the output of a pump with variable capacity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7058—Rotary output members

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

According to the present invention, in the hydraulic drive system using the hydraulic pump and the hydraulic motor, the hydraulic motor is driven by the hydraulic pump to drive the wheels, and the hydraulic drive is provided so that the wheels can be freely rotated without the hydraulic pump and the hydraulic motor being driven. It's about the system.
In general hydraulic system, the hydraulic pump is forcibly driven by the prime mover and rotates in one direction only by the rotational direction of the prime mover to continuously discharge hydraulic oil. Rotate the connected wheels continuously. Therefore, to control this, various control elements must be installed on the circuit. In addition, in the hydraulic system, if the hydraulic pump or the motor is stopped while driving, hydraulic braking may occur, which may cause a large accident due to inertia.
The present invention provides a hydraulic drive system in the hydraulic drive system when the hydraulic motor is driven to drive the wheels, the hydraulic drive system designed to maintain the inertia and acceleration of gravity even when the hydraulic system is stopped. It is about.

Figure pat00001

Description

Hydraulic Driving System

The present invention relates to a hydraulic drive system that discharges a flow rate to a hydraulic pump and works as a hydraulic motor. The present invention relates to a hydraulic drive system that can freely move without any obstacle even when the system is stopped.

    In general, power transmission devices include gear, chain, and belt driving in close or short range, wire rope driving in long distance, and directly drive wheels by an electric motor using battery power. It is becoming. In the case of hydraulic systems, there is a hydrostatic device, which is a hydraulic drive system applied to an excavator, which is a hydraulic system specially developed for heavy equipment, and is a very complicated and precisely controlled drive system, which is not suitable for a simple moving device. System.

  When the existing hydraulic system is applied, when the hydraulic pump is driven by the drive shaft driven by the prime mover, the main body is moved by connecting the hydraulic motor, which is the actuator, to the hydraulic line, to rotate the work and allowing the wheel connected to it to rotate. Make this possible. However, this hydraulic system can cause hydraulic brake due to the incompressibility of the fluid when it stops. This can cause shock and damage to the hydraulic system. To eliminate this problem, safety valves must be provided on the hydraulic line. This raises another problem of increased system complexity and manufacturing cost. Therefore, when driven by a power source, the same type of hydraulic system as before, but when the hydraulic power transmission device is stopped, the need for the development of a system that can solve the problem caused by the inertia and the acceleration of gravity has emerged.

The present invention is to solve the above problems, but when driven by a power source in the form of the same hydraulic system as before, hydraulic braking does not occur when the hydraulic power transmission is stopped, the body solves the inertia problem and gravity acceleration is It is an object to provide a hydraulic drive system equipped with a mechanical device that can be employed.

How to maintain inertia even when the hydraulic system is stopped and to allow acceleration by gravity mechanically

The output shaft of the hydraulic motor is constrained with the outer ring of the overrunning clutch and the hub on which the wheel is assembled is constrained with the inner ring of the overrunning clutch.When driven by the hydraulic motor, the overrunning clutch is integrated to rotate the wheels and the motor drive If not, the outer ring of the overrunning clutch is stopped, and only the inner ring of the wheel and the owner's running clutch is rotated to maintain the inertia and obtain acceleration due to gravity.

According to the present invention as described above, in the hydraulic drive system composed of the hydraulic pump and the hydraulic motor, the hydraulic drive through the basic principle of the overrunning clutch and the change of the hub 9 without applying a separate safety valve or electric and electronic system By completely eliminating the hydraulic braking problem generated when the system is stopped, it is possible to obtain a low-capacity high torque power by applying hydraulic pressure to a simple drive system.

Representative view is a plan view showing that the hydraulic pump and the hydraulic motor is installed and the overrun device is installed in the representative road of the present invention
1 is a front view showing that a hydraulic pump connected to a hydraulic tank and a hydraulic motor connected to a hydraulic line and an overrunning apparatus are provided.
2 is a simplified hydraulic circuit diagram according to the present invention.

 In order to achieve the above object, the present invention in the hydraulic power transmission system connecting the hydraulic pump and the hydraulic motor equipped with the overrunning element (2),

 Assembling the coupling (6) on the hydraulic motor shaft and the outer ring (7) of the overrunning clutch and bolts,

 The stopper is fixed by bolts to prevent the separation after assembling with the inner ring 10 of the overrunning clutch using a key to the shaft 11 integrated with the hub 9 configured to assemble the wheel,

 It is characterized in that the needle bearing 8 is installed between the hub 9 and the outer ring 7 of the overrunning clutch in a compact configuration.

 In the case of forward movement, when the pump drive shaft is rotated left from the power source, the driving gear rotates together through the overrunning element 2, and the hydraulic oil is supplied from the hydraulic tank to pump the pump. At this time, the discharged flow rate flows into the hydraulic motor 3 through the lower hydraulic line 5 to drive the hydraulic motor and returns to the hydraulic pump through the upper hydraulic line 5.

  Simultaneously with the drive of the hydraulic motor 3, the outer ring 7 of the overrunning clutch connected to the coupling 6 rotates, and the inner ring 10 of the overrunning clutch rotates by the overrunning element. At this time, while the shaft 11 is driven at the same time, the connected hub 9 and the wheel rotate left to move forward.

 When the operation of the hydraulic pump stops and the operation of the hydraulic motor stops, hydraulic braking occurs instantaneously due to the characteristics of the incompressible fluid, causing problems such as destruction of the system. Since 11 rotates only the inner race 10 of the overrunning clutch, forward movement is possible even when the hydraulic motor 3 is stopped, and the gravity acceleration also acts on the downhill to accelerate.

1 Hydraulic pump 2 Overrunning element 3 Hydraulic motor
4: hydraulic tank 5: hydraulic line 6: coupling
7: outer ring of the overrunning clutch 8: needle bearing 9: hub
10: inner ring of overrunning clutch 11: shaft

Claims (2)

In the hydraulic power transmission device, the pump drive shaft is pumped by assembling the overrunning element 2 and the drive gear, and the discharged flow rate is driven after the hydraulic motor 3 is driven and driven through the lower hydraulic line 5. Hydraulic fluid is a power transmission structure that is returned to the hydraulic pump (1) through the upper hydraulic line (5),
The hydraulic tank refilling hydraulic tank is installed above the hydraulic pump (1) and the hydraulic discharge and return position is formed as shown in Figure 1,
The rotational force of the hydraulic motor 3 is assembled with the coupling 6 and the outer ring 7 of the overrunning clutch and the bolt, and the inner ring 10 of the overrunning clutch is assembled with the shaft 11 and the key through the overrunning element to rotate. And the structure configured to rotate the hub (9),
Hydraulic drive characterized in that the overrunning element (2) installed in the hydraulic pump and the overrunning clutch (12) on the side of the hydraulic motor are installed to prevent the hydraulic braking from stopping the hydraulic pump and the hydraulic motor. system
  In the hydraulic power transmission device, the hydraulic drive system, characterized in that the check valve is installed on the hydraulic line to prevent the back flow of the working oil.
KR1020110002993A 2011-01-12 2011-01-12 Hydraulic driving system KR20120081721A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110002993A KR20120081721A (en) 2011-01-12 2011-01-12 Hydraulic driving system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110002993A KR20120081721A (en) 2011-01-12 2011-01-12 Hydraulic driving system

Publications (1)

Publication Number Publication Date
KR20120081721A true KR20120081721A (en) 2012-07-20

Family

ID=46713755

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020110002993A KR20120081721A (en) 2011-01-12 2011-01-12 Hydraulic driving system

Country Status (1)

Country Link
KR (1) KR20120081721A (en)

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E902 Notification of reason for refusal
E601 Decision to refuse application