EP4306800A1 - Elektrische pumpe, insbesondere zum betreiben eines hubzylinders eines stossdämpfers für fahrzeuge - Google Patents

Elektrische pumpe, insbesondere zum betreiben eines hubzylinders eines stossdämpfers für fahrzeuge Download PDF

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Publication number
EP4306800A1
EP4306800A1 EP23184939.9A EP23184939A EP4306800A1 EP 4306800 A1 EP4306800 A1 EP 4306800A1 EP 23184939 A EP23184939 A EP 23184939A EP 4306800 A1 EP4306800 A1 EP 4306800A1
Authority
EP
European Patent Office
Prior art keywords
branch
containing tank
valve
operating fluid
electric pump
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP23184939.9A
Other languages
English (en)
French (fr)
Inventor
Dario DI PIETRO
Alessandro POMPILIO
Roberto Zambardi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zf Automotive Italia Srl
Original Assignee
Zf Automotive Italia Srl
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 Zf Automotive Italia Srl filed Critical Zf Automotive Italia Srl
Publication of EP4306800A1 publication Critical patent/EP4306800A1/de
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F04B23/025—Pumping installations or systems having reservoirs the pump being located directly adjacent the reservoir
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors

Definitions

  • the present invention relates to an electric pump, in particular for operating a lifting cylinder of a shock absorber for vehicles.
  • the present invention is particularly advantageous for application in an electric pump for feeding and operating a hydraulic actuator cylinder of a vehicle.
  • the present invention relates to an electric pump of the type comprising a containing tank for an operating fluid, in the case in question oil; a feeding pump to feed the operating fluid from the containing tank to a user, in particular the lifting cylinder of the shock absorber of a vehicle; an electric motor for operating the feeding pump; and a hydraulic circuit to connect the containing tank, the feeding pump, and the user to one another.
  • the containing tank accommodates, on the inside, the operating fluid, and is connected to a compressed air pneumatic device designed to feed the operating fluid to the outside of the containing tank.
  • Known electric pumps of the type described above have some problems mainly deriving from the fact that the containing tank is a pressurized containing tank, is relatively complex and costly, and requires isolation of at least part of the electric motor from the operating fluid.
  • the object of the present invention is to provide an electric pump, in particular for operating a lifting cylinder of a shock absorber for vehicles, which solves the problems described above and which is simple and inexpensive to implement.
  • an electric pump in particular for operating a lifting cylinder of a shock absorber for vehicles, as claimed in the appended claims.
  • FIG. 1 , 2 , and 3 schematically illustrate a preferred embodiment of the electric pump of the present invention in four different operating modes.
  • the reference number 1 indicates, as a whole, an electric pump for operating a lifting cylinder 2, which defines part of a shock absorber 3 for a vehicle (not illustrated), and allows the lifting and lowering of a chassis (not illustrated) of the vehicle (not illustrated) to be selectively controlled.
  • the electric pump 1 comprises a containing tank 4 for an operating fluid 5, in this case oil, of the cylinder 2; a feeding pump 6 to feed the operating fluid from the tank 4 to the cylinder 2; and a hydraulic circuit 7 to connect the tank 4, the pump 6, and the cylinder 2 to one another.
  • the tank 4 comprises a container 8 and a floating piston 9 made of a plastic material.
  • the piston 9 is mounted inside the container 8, is coupled in a fluid-tight manner with the container 8 through an annular gasket (not illustrated) mounted on the piston 9, and defines inside the container 8 a first variable volume chamber 10 containing the fluid 5 and a second variable volume chamber 11, communicating with the outside through a vent valve (not illustrated) designed to keep the chamber 11 at atmospheric pressure.
  • the tank 4 is further provided with a detection device 12 to detect the position of the piston 9 along the container 8.
  • the device 12 comprises at least one magnet 13 fixed to the piston 9 and a linear position sensor 14, which is mounted on the container 8, extends along the container 8, and cooperates with the magnet 13 to detect the position of the magnet 13 and, hence, of the piston 9 along the container 8.
  • the pump 6 is a two-way gear pump configured to rotate both in clockwise and in counter-clockwise direction.
  • the hydraulic circuit 7 comprises a first branch 15 and a second branch 16 mounted in parallel with each other between the tank 4 and the pump 6 and each provided with a respective suction valve 17, in particular a non-return valve.
  • Opening of the valves 17 and, hence, flow of the operating fluid along the branches 15, 16 are controlled selectively according to the direction of rotation of the pump 6.
  • the circuit 7 further comprises a third branch 18 to connect the pump 6 and a branch 19 for inflow of the fluid 5 into the lifting cylinder 2 to one another; a fourth branch 20 to connect the first branch 15 and the third branch 18 to one another; and a fifth branch 21 to connect the tank 4 and the third branch 18 to one another.
  • the fourth branch 20 is connected to the first branch 15 downstream of the relative suction valve 17 in a flowing direction 22 of the fluid 5 from the tank 4 to the pump 6 along the first branch 15.
  • the fifth branch 21 is connected to the third branch 18 downstream of the fourth branch 20 in a flowing direction 23 of the fluid 5 from the pump 6 to the shock absorber 3 along the third branch 18, and is also connected to the second branch 16 upstream of the relative suction valve 17 in a flowing direction 24 of the fluid 5 from the tank 4 to the pump 6 along the second branch 16.
  • the circuit 7 further comprises a valve device 25, which is mounted between the third branch 18 and the fourth branch 20, and is provided with a slide valve 26 and with a spring 27 designed to move, and normally maintain, the slide valve 26 in a first operating position ( Fig. 1 ), in which the slide valve 26 allows the fluid 5 to flow from the pump 6 to the cylinder 2 and prevents the fluid 5 from flowing from the cylinder 2 to the pump 6.
  • a valve device 25 which is mounted between the third branch 18 and the fourth branch 20, and is provided with a slide valve 26 and with a spring 27 designed to move, and normally maintain, the slide valve 26 in a first operating position ( Fig. 1 ), in which the slide valve 26 allows the fluid 5 to flow from the pump 6 to the cylinder 2 and prevents the fluid 5 from flowing from the cylinder 2 to the pump 6.
  • the slide valve 26 is movable, due to the thrust of the fluid 5 fed by the pump 6 along the fourth branch 20 and against the action of the spring 27, from the first operating position to a second operating position ( Fig. 2 ), in which the slide valve 26 allows the fluid 5 to flow from the cylinder 2 to the pump 6.
  • the circuit 7 is further provided with a solenoid valve 28, which is mounted along the fifth branch 21, and comprises a slide valve 29 and a spring 30 designed to move, and normally maintain, the slide valve 29 in a closing position of the fifth branch 21 ( Figs. 1 and 2 ).
  • the solenoid valve 28 is electrically powered to move the slide valve 29 against the action of the spring 30 from the closing position to an opening position of the fifth branch 21, in which the fluid 5 flows from the cylinder 2 to the tank 4 ( Fig. 3 ).
  • the circuit 7 further comprises a maximum pressure valve 31 mounted between the third branch 18 and the fifth branch 21 and connected to the third branch 18 downstream of the fourth branch 20 in the flowing direction 23 of the fluid 5 from the pump 6 to the cylinder 2.
  • the circuit 7 further comprises a sixth branch 32, which connects the fourth branch 20 and the first branch 15 to one another, and is connected to the first branch 15 upstream of the relative suction valve 17 in the flowing direction 22 of the fluid 5 from the tank 4 to the pump 6 along the first branch 15.
  • the circuit 7 is further provided with a discharge valve 33, which is mounted along the sixth branch 32 to allow the fluid 5 to flow back to the tank 4, and has an opening pressure that is smaller than an opening pressure of the maximum pressure valve 31.
  • the setting of the opening pressure of the valve 33 depends on the maximum pressure in the branch 19 and in the branch 18 between the valve device 25 and the valve 34 and on the pilot ratio (ratio of the hydraulic thrust area) of the valve device 25 between the branch 18 and the branch 20.
  • the circuit 7 finally comprises a mechanical coupling valve 34 designed to connect the third branch 18 and, hence, the electric pump 1 to the branch 19 for inflow of the fluid 5 into the cylinder 2.
  • valve 34 is moved and maintained in an opening position, in which the valve 34 allows transfer of the fluid 5 between the third branch 18 and the branch 19.
  • the electric pump 1 has four different operating modes, which shall now be described with reference to Figs. 1 , 2 , and 3 and starting from an instant in which the valve device 25 is arranged in its first operating position and the solenoid valve 28 is arranged in its closing position.
  • the pump 6 is operated counter-clockwise so as to allow:
  • the fluid 5 is pressurized by the pump 6 and fed along the third branch 18, through the valve 34, and to the cylinder 2 and allows the suction valve 17 of the second branch 16 to be maintained closed.
  • a second operating mode illustrated in Fig. 1 and used to block the chassis (not illustrated) of the vehicle (not illustrated) in a raised position the pump 6 is deactivated, return of the pressurized fluid 5 fed to the cylinder 2 is prevented both by the valve device 25, and by the solenoid valve 28, and the pressurized fluid 5 is contained between the cylinder 2, the valve device 25, and the solenoid valve 28.
  • the pressurized fluid 5 is fed by the pump 6 along the fourth branch 20, allows the suction valve 17 of the first branch 15 to be maintained closed, and also allows the slide valve 26 of the valve device 25 to move from its first operating position into its second operating position.
  • the fluid 5 is fed firstly from the cylinder 2 to the pump 6 along the third branch 18 and then from the pump 6 into the fourth branch 20 so as to open the discharge valve 33 and flow back once again into the tank 4.
  • the discharge valve 33 is configured so as to avoid instability and noise generated by discharge of the fluid 5 into the tank 4.
  • a fourth operating mode illustrated in Fig. 3 and used to lower the chassis (not illustrated) of the vehicle (not illustrated) with a relatively high descent speed the pump 6 is deactivated, the slide valve 26 for distribution of the valve device 25 is moved again by the spring 27 into its first operating position so as to prevent the fluid 5 from flowing back into the pump 6 along the third branch 18, and the solenoid valve 28 is activated and moved into its opening position so as to allow the fluid 5 to flow back from the cylinder 2 into the tank 4 along the fifth branch 21.
  • the electric pump 1 has some advantages mainly deriving from the fact that:

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vehicle Body Suspensions (AREA)
EP23184939.9A 2022-07-15 2023-07-12 Elektrische pumpe, insbesondere zum betreiben eines hubzylinders eines stossdämpfers für fahrzeuge Pending EP4306800A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT202200014926 2022-07-15

Publications (1)

Publication Number Publication Date
EP4306800A1 true EP4306800A1 (de) 2024-01-17

Family

ID=83505613

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23184939.9A Pending EP4306800A1 (de) 2022-07-15 2023-07-12 Elektrische pumpe, insbesondere zum betreiben eines hubzylinders eines stossdämpfers für fahrzeuge

Country Status (1)

Country Link
EP (1) EP4306800A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170037923A1 (en) * 2014-04-16 2017-02-09 Alain BORDIER Hydraulic shock absorber with compression filtering
EP3276172A1 (de) * 2016-07-29 2018-01-31 DROPSA S.p.A. Pumpe mit einem reservoir eines schmiermittels
DE102018215132A1 (de) * 2018-09-06 2020-03-12 Ford Global Technologies, Llc Hochdruckpumpe für eine Treibstoffzufuhr eines Verbrennungsmotors
JP2020104833A (ja) * 2018-12-27 2020-07-09 株式会社アドヴィックス 車両用制動装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170037923A1 (en) * 2014-04-16 2017-02-09 Alain BORDIER Hydraulic shock absorber with compression filtering
EP3276172A1 (de) * 2016-07-29 2018-01-31 DROPSA S.p.A. Pumpe mit einem reservoir eines schmiermittels
DE102018215132A1 (de) * 2018-09-06 2020-03-12 Ford Global Technologies, Llc Hochdruckpumpe für eine Treibstoffzufuhr eines Verbrennungsmotors
JP2020104833A (ja) * 2018-12-27 2020-07-09 株式会社アドヴィックス 車両用制動装置

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